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|
- /* esp.c: ESP Sun SCSI driver.
- *
- * Copyright (C) 1995, 1998, 2006 David S. Miller (davem@davemloft.net)
- */
- /* TODO:
- *
- * 1) Maybe disable parity checking in config register one for SCSI1
- * targets. (Gilmore says parity error on the SBus can lock up
- * old sun4c's)
- * 2) Add support for DMA2 pipelining.
- * 3) Add tagged queueing.
- */
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/blkdev.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/init.h>
- #include <linux/spinlock.h>
- #include <linux/interrupt.h>
- #include <linux/module.h>
- #include "esp.h"
- #include <asm/sbus.h>
- #include <asm/dma.h>
- #include <asm/system.h>
- #include <asm/ptrace.h>
- #include <asm/pgtable.h>
- #include <asm/oplib.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #ifndef __sparc_v9__
- #include <asm/machines.h>
- #include <asm/idprom.h>
- #endif
- #include <scsi/scsi.h>
- #include <scsi/scsi_cmnd.h>
- #include <scsi/scsi_device.h>
- #include <scsi/scsi_eh.h>
- #include <scsi/scsi_host.h>
- #include <scsi/scsi_tcq.h>
- #define DRV_VERSION "1.101"
- #define DEBUG_ESP
- /* #define DEBUG_ESP_HME */
- /* #define DEBUG_ESP_DATA */
- /* #define DEBUG_ESP_QUEUE */
- /* #define DEBUG_ESP_DISCONNECT */
- /* #define DEBUG_ESP_STATUS */
- /* #define DEBUG_ESP_PHASES */
- /* #define DEBUG_ESP_WORKBUS */
- /* #define DEBUG_STATE_MACHINE */
- /* #define DEBUG_ESP_CMDS */
- /* #define DEBUG_ESP_IRQS */
- /* #define DEBUG_SDTR */
- /* #define DEBUG_ESP_SG */
- /* Use the following to sprinkle debugging messages in a way which
- * suits you if combinations of the above become too verbose when
- * trying to track down a specific problem.
- */
- /* #define DEBUG_ESP_MISC */
- #if defined(DEBUG_ESP)
- #define ESPLOG(foo) printk foo
- #else
- #define ESPLOG(foo)
- #endif /* (DEBUG_ESP) */
- #if defined(DEBUG_ESP_HME)
- #define ESPHME(foo) printk foo
- #else
- #define ESPHME(foo)
- #endif
- #if defined(DEBUG_ESP_DATA)
- #define ESPDATA(foo) printk foo
- #else
- #define ESPDATA(foo)
- #endif
- #if defined(DEBUG_ESP_QUEUE)
- #define ESPQUEUE(foo) printk foo
- #else
- #define ESPQUEUE(foo)
- #endif
- #if defined(DEBUG_ESP_DISCONNECT)
- #define ESPDISC(foo) printk foo
- #else
- #define ESPDISC(foo)
- #endif
- #if defined(DEBUG_ESP_STATUS)
- #define ESPSTAT(foo) printk foo
- #else
- #define ESPSTAT(foo)
- #endif
- #if defined(DEBUG_ESP_PHASES)
- #define ESPPHASE(foo) printk foo
- #else
- #define ESPPHASE(foo)
- #endif
- #if defined(DEBUG_ESP_WORKBUS)
- #define ESPBUS(foo) printk foo
- #else
- #define ESPBUS(foo)
- #endif
- #if defined(DEBUG_ESP_IRQS)
- #define ESPIRQ(foo) printk foo
- #else
- #define ESPIRQ(foo)
- #endif
- #if defined(DEBUG_SDTR)
- #define ESPSDTR(foo) printk foo
- #else
- #define ESPSDTR(foo)
- #endif
- #if defined(DEBUG_ESP_MISC)
- #define ESPMISC(foo) printk foo
- #else
- #define ESPMISC(foo)
- #endif
- /* Command phase enumeration. */
- enum {
- not_issued = 0x00, /* Still in the issue_SC queue. */
- /* Various forms of selecting a target. */
- #define in_slct_mask 0x10
- in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */
- in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */
- in_slct_msg = 0x12, /* select, then send a message */
- in_slct_tag = 0x13, /* select and send tagged queue msg */
- in_slct_sneg = 0x14, /* select and acquire sync capabilities */
- /* Any post selection activity. */
- #define in_phases_mask 0x20
- in_datain = 0x20, /* Data is transferring from the bus */
- in_dataout = 0x21, /* Data is transferring to the bus */
- in_data_done = 0x22, /* Last DMA data operation done (maybe) */
- in_msgin = 0x23, /* Eating message from target */
- in_msgincont = 0x24, /* Eating more msg bytes from target */
- in_msgindone = 0x25, /* Decide what to do with what we got */
- in_msgout = 0x26, /* Sending message to target */
- in_msgoutdone = 0x27, /* Done sending msg out */
- in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */
- in_cmdend = 0x29, /* Done sending slow cmd */
- in_status = 0x2a, /* Was in status phase, finishing cmd */
- in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */
- in_the_dark = 0x2c, /* Don't know what bus phase we are in */
- /* Special states, ie. not normal bus transitions... */
- #define in_spec_mask 0x80
- in_abortone = 0x80, /* Aborting one command currently */
- in_abortall = 0x81, /* Blowing away all commands we have */
- in_resetdev = 0x82, /* SCSI target reset in progress */
- in_resetbus = 0x83, /* SCSI bus reset in progress */
- in_tgterror = 0x84, /* Target did something stupid */
- };
- enum {
- /* Zero has special meaning, see skipahead[12]. */
- /*0*/ do_never,
- /*1*/ do_phase_determine,
- /*2*/ do_reset_bus,
- /*3*/ do_reset_complete,
- /*4*/ do_work_bus,
- /*5*/ do_intr_end
- };
- /* Forward declarations. */
- static irqreturn_t esp_intr(int irq, void *dev_id);
- /* Debugging routines */
- struct esp_cmdstrings {
- u8 cmdchar;
- char *text;
- } esp_cmd_strings[] = {
- /* Miscellaneous */
- { ESP_CMD_NULL, "ESP_NOP", },
- { ESP_CMD_FLUSH, "FIFO_FLUSH", },
- { ESP_CMD_RC, "RSTESP", },
- { ESP_CMD_RS, "RSTSCSI", },
- /* Disconnected State Group */
- { ESP_CMD_RSEL, "RESLCTSEQ", },
- { ESP_CMD_SEL, "SLCTNATN", },
- { ESP_CMD_SELA, "SLCTATN", },
- { ESP_CMD_SELAS, "SLCTATNSTOP", },
- { ESP_CMD_ESEL, "ENSLCTRESEL", },
- { ESP_CMD_DSEL, "DISSELRESEL", },
- { ESP_CMD_SA3, "SLCTATN3", },
- { ESP_CMD_RSEL3, "RESLCTSEQ", },
- /* Target State Group */
- { ESP_CMD_SMSG, "SNDMSG", },
- { ESP_CMD_SSTAT, "SNDSTATUS", },
- { ESP_CMD_SDATA, "SNDDATA", },
- { ESP_CMD_DSEQ, "DISCSEQ", },
- { ESP_CMD_TSEQ, "TERMSEQ", },
- { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", },
- { ESP_CMD_DCNCT, "DISC", },
- { ESP_CMD_RMSG, "RCVMSG", },
- { ESP_CMD_RCMD, "RCVCMD", },
- { ESP_CMD_RDATA, "RCVDATA", },
- { ESP_CMD_RCSEQ, "RCVCMDSEQ", },
- /* Initiator State Group */
- { ESP_CMD_TI, "TRANSINFO", },
- { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", },
- { ESP_CMD_MOK, "MSGACCEPTED", },
- { ESP_CMD_TPAD, "TPAD", },
- { ESP_CMD_SATN, "SATN", },
- { ESP_CMD_RATN, "RATN", },
- };
- #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
- /* Print textual representation of an ESP command */
- static inline void esp_print_cmd(u8 espcmd)
- {
- u8 dma_bit = espcmd & ESP_CMD_DMA;
- int i;
- espcmd &= ~dma_bit;
- for (i = 0; i < NUM_ESP_COMMANDS; i++)
- if (esp_cmd_strings[i].cmdchar == espcmd)
- break;
- if (i == NUM_ESP_COMMANDS)
- printk("ESP_Unknown");
- else
- printk("%s%s", esp_cmd_strings[i].text,
- ((dma_bit) ? "+DMA" : ""));
- }
- /* Print the status register's value */
- static inline void esp_print_statreg(u8 statreg)
- {
- u8 phase;
- printk("STATUS<");
- phase = statreg & ESP_STAT_PMASK;
- printk("%s,", (phase == ESP_DOP ? "DATA-OUT" :
- (phase == ESP_DIP ? "DATA-IN" :
- (phase == ESP_CMDP ? "COMMAND" :
- (phase == ESP_STATP ? "STATUS" :
- (phase == ESP_MOP ? "MSG-OUT" :
- (phase == ESP_MIP ? "MSG_IN" :
- "unknown")))))));
- if (statreg & ESP_STAT_TDONE)
- printk("TRANS_DONE,");
- if (statreg & ESP_STAT_TCNT)
- printk("TCOUNT_ZERO,");
- if (statreg & ESP_STAT_PERR)
- printk("P_ERROR,");
- if (statreg & ESP_STAT_SPAM)
- printk("SPAM,");
- if (statreg & ESP_STAT_INTR)
- printk("IRQ,");
- printk(">");
- }
- /* Print the interrupt register's value */
- static inline void esp_print_ireg(u8 intreg)
- {
- printk("INTREG< ");
- if (intreg & ESP_INTR_S)
- printk("SLCT_NATN ");
- if (intreg & ESP_INTR_SATN)
- printk("SLCT_ATN ");
- if (intreg & ESP_INTR_RSEL)
- printk("RSLCT ");
- if (intreg & ESP_INTR_FDONE)
- printk("FDONE ");
- if (intreg & ESP_INTR_BSERV)
- printk("BSERV ");
- if (intreg & ESP_INTR_DC)
- printk("DISCNCT ");
- if (intreg & ESP_INTR_IC)
- printk("ILL_CMD ");
- if (intreg & ESP_INTR_SR)
- printk("SCSI_BUS_RESET ");
- printk(">");
- }
- /* Print the sequence step registers contents */
- static inline void esp_print_seqreg(u8 stepreg)
- {
- stepreg &= ESP_STEP_VBITS;
- printk("STEP<%s>",
- (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" :
- (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" :
- (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" :
- (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" :
- (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" :
- "UNKNOWN"))))));
- }
- static char *phase_string(int phase)
- {
- switch (phase) {
- case not_issued:
- return "UNISSUED";
- case in_slct_norm:
- return "SLCTNORM";
- case in_slct_stop:
- return "SLCTSTOP";
- case in_slct_msg:
- return "SLCTMSG";
- case in_slct_tag:
- return "SLCTTAG";
- case in_slct_sneg:
- return "SLCTSNEG";
- case in_datain:
- return "DATAIN";
- case in_dataout:
- return "DATAOUT";
- case in_data_done:
- return "DATADONE";
- case in_msgin:
- return "MSGIN";
- case in_msgincont:
- return "MSGINCONT";
- case in_msgindone:
- return "MSGINDONE";
- case in_msgout:
- return "MSGOUT";
- case in_msgoutdone:
- return "MSGOUTDONE";
- case in_cmdbegin:
- return "CMDBEGIN";
- case in_cmdend:
- return "CMDEND";
- case in_status:
- return "STATUS";
- case in_freeing:
- return "FREEING";
- case in_the_dark:
- return "CLUELESS";
- case in_abortone:
- return "ABORTONE";
- case in_abortall:
- return "ABORTALL";
- case in_resetdev:
- return "RESETDEV";
- case in_resetbus:
- return "RESETBUS";
- case in_tgterror:
- return "TGTERROR";
- default:
- return "UNKNOWN";
- };
- }
- #ifdef DEBUG_STATE_MACHINE
- static inline void esp_advance_phase(struct scsi_cmnd *s, int newphase)
- {
- ESPLOG(("<%s>", phase_string(newphase)));
- s->SCp.sent_command = s->SCp.phase;
- s->SCp.phase = newphase;
- }
- #else
- #define esp_advance_phase(__s, __newphase) \
- (__s)->SCp.sent_command = (__s)->SCp.phase; \
- (__s)->SCp.phase = (__newphase);
- #endif
- #ifdef DEBUG_ESP_CMDS
- static inline void esp_cmd(struct esp *esp, u8 cmd)
- {
- esp->espcmdlog[esp->espcmdent] = cmd;
- esp->espcmdent = (esp->espcmdent + 1) & 31;
- sbus_writeb(cmd, esp->eregs + ESP_CMD);
- }
- #else
- #define esp_cmd(__esp, __cmd) \
- sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
- #endif
- #define ESP_INTSOFF(__dregs) \
- sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
- #define ESP_INTSON(__dregs) \
- sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
- #define ESP_IRQ_P(__dregs) \
- (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
- /* How we use the various Linux SCSI data structures for operation.
- *
- * struct scsi_cmnd:
- *
- * We keep track of the synchronous capabilities of a target
- * in the device member, using sync_min_period and
- * sync_max_offset. These are the values we directly write
- * into the ESP registers while running a command. If offset
- * is zero the ESP will use asynchronous transfers.
- * If the borken flag is set we assume we shouldn't even bother
- * trying to negotiate for synchronous transfer as this target
- * is really stupid. If we notice the target is dropping the
- * bus, and we have been allowing it to disconnect, we clear
- * the disconnect flag.
- */
- /* Manipulation of the ESP command queues. Thanks to the aha152x driver
- * and its author, Juergen E. Fischer, for the methods used here.
- * Note that these are per-ESP queues, not global queues like
- * the aha152x driver uses.
- */
- static inline void append_SC(struct scsi_cmnd **SC, struct scsi_cmnd *new_SC)
- {
- struct scsi_cmnd *end;
- new_SC->host_scribble = (unsigned char *) NULL;
- if (!*SC)
- *SC = new_SC;
- else {
- for (end=*SC;end->host_scribble;end=(struct scsi_cmnd *)end->host_scribble)
- ;
- end->host_scribble = (unsigned char *) new_SC;
- }
- }
- static inline void prepend_SC(struct scsi_cmnd **SC, struct scsi_cmnd *new_SC)
- {
- new_SC->host_scribble = (unsigned char *) *SC;
- *SC = new_SC;
- }
- static inline struct scsi_cmnd *remove_first_SC(struct scsi_cmnd **SC)
- {
- struct scsi_cmnd *ptr;
- ptr = *SC;
- if (ptr)
- *SC = (struct scsi_cmnd *) (*SC)->host_scribble;
- return ptr;
- }
- static inline struct scsi_cmnd *remove_SC(struct scsi_cmnd **SC, int target, int lun)
- {
- struct scsi_cmnd *ptr, *prev;
- for (ptr = *SC, prev = NULL;
- ptr && ((ptr->device->id != target) || (ptr->device->lun != lun));
- prev = ptr, ptr = (struct scsi_cmnd *) ptr->host_scribble)
- ;
- if (ptr) {
- if (prev)
- prev->host_scribble=ptr->host_scribble;
- else
- *SC=(struct scsi_cmnd *)ptr->host_scribble;
- }
- return ptr;
- }
- /* Resetting various pieces of the ESP scsi driver chipset/buses. */
- static void esp_reset_dma(struct esp *esp)
- {
- int can_do_burst16, can_do_burst32, can_do_burst64;
- int can_do_sbus64;
- u32 tmp;
- can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
- can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
- can_do_burst64 = 0;
- can_do_sbus64 = 0;
- if (sbus_can_dma_64bit(esp->sdev))
- can_do_sbus64 = 1;
- if (sbus_can_burst64(esp->sdev))
- can_do_burst64 = (esp->bursts & DMA_BURST64) != 0;
- /* Punt the DVMA into a known state. */
- if (esp->dma->revision != dvmahme) {
- tmp = sbus_readl(esp->dregs + DMA_CSR);
- sbus_writel(tmp | DMA_RST_SCSI, esp->dregs + DMA_CSR);
- sbus_writel(tmp & ~DMA_RST_SCSI, esp->dregs + DMA_CSR);
- }
- switch (esp->dma->revision) {
- case dvmahme:
- /* This is the HME DVMA gate array. */
- sbus_writel(DMA_RESET_FAS366, esp->dregs + DMA_CSR);
- sbus_writel(DMA_RST_SCSI, esp->dregs + DMA_CSR);
- esp->prev_hme_dmacsr = (DMA_PARITY_OFF|DMA_2CLKS|DMA_SCSI_DISAB|DMA_INT_ENAB);
- esp->prev_hme_dmacsr &= ~(DMA_ENABLE|DMA_ST_WRITE|DMA_BRST_SZ);
- if (can_do_burst64)
- esp->prev_hme_dmacsr |= DMA_BRST64;
- else if (can_do_burst32)
- esp->prev_hme_dmacsr |= DMA_BRST32;
- if (can_do_sbus64) {
- esp->prev_hme_dmacsr |= DMA_SCSI_SBUS64;
- sbus_set_sbus64(esp->sdev, esp->bursts);
- }
- /* This chip is horrible. */
- while (sbus_readl(esp->dregs + DMA_CSR) & DMA_PEND_READ)
- udelay(1);
- sbus_writel(0, esp->dregs + DMA_CSR);
- sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
- /* This is necessary to avoid having the SCSI channel
- * engine lock up on us.
- */
- sbus_writel(0, esp->dregs + DMA_ADDR);
- break;
- case dvmarev2:
- /* This is the gate array found in the sun4m
- * NCR SBUS I/O subsystem.
- */
- if (esp->erev != esp100) {
- tmp = sbus_readl(esp->dregs + DMA_CSR);
- sbus_writel(tmp | DMA_3CLKS, esp->dregs + DMA_CSR);
- }
- break;
- case dvmarev3:
- tmp = sbus_readl(esp->dregs + DMA_CSR);
- tmp &= ~DMA_3CLKS;
- tmp |= DMA_2CLKS;
- if (can_do_burst32) {
- tmp &= ~DMA_BRST_SZ;
- tmp |= DMA_BRST32;
- }
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- break;
- case dvmaesc1:
- /* This is the DMA unit found on SCSI/Ether cards. */
- tmp = sbus_readl(esp->dregs + DMA_CSR);
- tmp |= DMA_ADD_ENABLE;
- tmp &= ~DMA_BCNT_ENAB;
- if (!can_do_burst32 && can_do_burst16) {
- tmp |= DMA_ESC_BURST;
- } else {
- tmp &= ~(DMA_ESC_BURST);
- }
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- break;
- default:
- break;
- };
- ESP_INTSON(esp->dregs);
- }
- /* Reset the ESP chip, _not_ the SCSI bus. */
- static void __init esp_reset_esp(struct esp *esp)
- {
- u8 family_code, version;
- int i;
- /* Now reset the ESP chip */
- esp_cmd(esp, ESP_CMD_RC);
- esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
- esp_cmd(esp, ESP_CMD_NULL | ESP_CMD_DMA);
- /* Reload the configuration registers */
- sbus_writeb(esp->cfact, esp->eregs + ESP_CFACT);
- esp->prev_stp = 0;
- sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
- esp->prev_soff = 0;
- sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
- sbus_writeb(esp->neg_defp, esp->eregs + ESP_TIMEO);
- /* This is the only point at which it is reliable to read
- * the ID-code for a fast ESP chip variants.
- */
- esp->max_period = ((35 * esp->ccycle) / 1000);
- if (esp->erev == fast) {
- version = sbus_readb(esp->eregs + ESP_UID);
- family_code = (version & 0xf8) >> 3;
- if (family_code == 0x02)
- esp->erev = fas236;
- else if (family_code == 0x0a)
- esp->erev = fashme; /* Version is usually '5'. */
- else
- esp->erev = fas100a;
- ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
- esp->esp_id,
- (esp->erev == fas236) ? "fas236" :
- ((esp->erev == fas100a) ? "fas100a" :
- "fasHME"), family_code, (version & 7)));
- esp->min_period = ((4 * esp->ccycle) / 1000);
- } else {
- esp->min_period = ((5 * esp->ccycle) / 1000);
- }
- esp->max_period = (esp->max_period + 3)>>2;
- esp->min_period = (esp->min_period + 3)>>2;
- sbus_writeb(esp->config1, esp->eregs + ESP_CFG1);
- switch (esp->erev) {
- case esp100:
- /* nothing to do */
- break;
- case esp100a:
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- break;
- case esp236:
- /* Slow 236 */
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- esp->prev_cfg3 = esp->config3[0];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- break;
- case fashme:
- esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB);
- /* fallthrough... */
- case fas236:
- /* Fast 236 or HME */
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- for (i = 0; i < 16; i++) {
- if (esp->erev == fashme) {
- u8 cfg3;
- cfg3 = ESP_CONFIG3_FCLOCK | ESP_CONFIG3_OBPUSH;
- if (esp->scsi_id >= 8)
- cfg3 |= ESP_CONFIG3_IDBIT3;
- esp->config3[i] |= cfg3;
- } else {
- esp->config3[i] |= ESP_CONFIG3_FCLK;
- }
- }
- esp->prev_cfg3 = esp->config3[0];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- if (esp->erev == fashme) {
- esp->radelay = 80;
- } else {
- if (esp->diff)
- esp->radelay = 0;
- else
- esp->radelay = 96;
- }
- break;
- case fas100a:
- /* Fast 100a */
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- for (i = 0; i < 16; i++)
- esp->config3[i] |= ESP_CONFIG3_FCLOCK;
- esp->prev_cfg3 = esp->config3[0];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- esp->radelay = 32;
- break;
- default:
- panic("esp: what could it be... I wonder...");
- break;
- };
- /* Eat any bitrot in the chip */
- sbus_readb(esp->eregs + ESP_INTRPT);
- udelay(100);
- }
- /* This places the ESP into a known state at boot time. */
- static void __init esp_bootup_reset(struct esp *esp)
- {
- u8 tmp;
- /* Reset the DMA */
- esp_reset_dma(esp);
- /* Reset the ESP */
- esp_reset_esp(esp);
- /* Reset the SCSI bus, but tell ESP not to generate an irq */
- tmp = sbus_readb(esp->eregs + ESP_CFG1);
- tmp |= ESP_CONFIG1_SRRDISAB;
- sbus_writeb(tmp, esp->eregs + ESP_CFG1);
- esp_cmd(esp, ESP_CMD_RS);
- udelay(400);
- sbus_writeb(esp->config1, esp->eregs + ESP_CFG1);
- /* Eat any bitrot in the chip and we are done... */
- sbus_readb(esp->eregs + ESP_INTRPT);
- }
- static int __init esp_find_dvma(struct esp *esp, struct sbus_dev *dma_sdev)
- {
- struct sbus_dev *sdev = esp->sdev;
- struct sbus_dma *dma;
- if (dma_sdev != NULL) {
- for_each_dvma(dma) {
- if (dma->sdev == dma_sdev)
- break;
- }
- } else {
- for_each_dvma(dma) {
- /* If allocated already, can't use it. */
- if (dma->allocated)
- continue;
- if (dma->sdev == NULL)
- break;
- /* If bus + slot are the same and it has the
- * correct OBP name, it's ours.
- */
- if (sdev->bus == dma->sdev->bus &&
- sdev->slot == dma->sdev->slot &&
- (!strcmp(dma->sdev->prom_name, "dma") ||
- !strcmp(dma->sdev->prom_name, "espdma")))
- break;
- }
- }
- /* If we don't know how to handle the dvma,
- * do not use this device.
- */
- if (dma == NULL) {
- printk("Cannot find dvma for ESP%d's SCSI\n", esp->esp_id);
- return -1;
- }
- if (dma->allocated) {
- printk("esp%d: can't use my espdma\n", esp->esp_id);
- return -1;
- }
- dma->allocated = 1;
- esp->dma = dma;
- esp->dregs = dma->regs;
- return 0;
- }
- static int __init esp_map_regs(struct esp *esp, int hme)
- {
- struct sbus_dev *sdev = esp->sdev;
- struct resource *res;
- /* On HME, two reg sets exist, first is DVMA,
- * second is ESP registers.
- */
- if (hme)
- res = &sdev->resource[1];
- else
- res = &sdev->resource[0];
- esp->eregs = sbus_ioremap(res, 0, ESP_REG_SIZE, "ESP Registers");
- if (esp->eregs == 0)
- return -1;
- return 0;
- }
- static int __init esp_map_cmdarea(struct esp *esp)
- {
- struct sbus_dev *sdev = esp->sdev;
- esp->esp_command = sbus_alloc_consistent(sdev, 16,
- &esp->esp_command_dvma);
- if (esp->esp_command == NULL ||
- esp->esp_command_dvma == 0)
- return -1;
- return 0;
- }
- static int __init esp_register_irq(struct esp *esp)
- {
- esp->ehost->irq = esp->irq = esp->sdev->irqs[0];
- /* We used to try various overly-clever things to
- * reduce the interrupt processing overhead on
- * sun4c/sun4m when multiple ESP's shared the
- * same IRQ. It was too complex and messy to
- * sanely maintain.
- */
- if (request_irq(esp->ehost->irq, esp_intr,
- IRQF_SHARED, "ESP SCSI", esp)) {
- printk("esp%d: Cannot acquire irq line\n",
- esp->esp_id);
- return -1;
- }
- printk("esp%d: IRQ %d ", esp->esp_id,
- esp->ehost->irq);
- return 0;
- }
- static void __init esp_get_scsi_id(struct esp *esp)
- {
- struct sbus_dev *sdev = esp->sdev;
- struct device_node *dp = sdev->ofdev.node;
- esp->scsi_id = of_getintprop_default(dp,
- "initiator-id",
- -1);
- if (esp->scsi_id == -1)
- esp->scsi_id = of_getintprop_default(dp,
- "scsi-initiator-id",
- -1);
- if (esp->scsi_id == -1)
- esp->scsi_id = (sdev->bus == NULL) ? 7 :
- of_getintprop_default(sdev->bus->ofdev.node,
- "scsi-initiator-id",
- 7);
- esp->ehost->this_id = esp->scsi_id;
- esp->scsi_id_mask = (1 << esp->scsi_id);
- }
- static void __init esp_get_clock_params(struct esp *esp)
- {
- struct sbus_dev *sdev = esp->sdev;
- int prom_node = esp->prom_node;
- int sbus_prom_node;
- unsigned int fmhz;
- u8 ccf;
- if (sdev != NULL && sdev->bus != NULL)
- sbus_prom_node = sdev->bus->prom_node;
- else
- sbus_prom_node = 0;
- /* This is getting messy but it has to be done
- * correctly or else you get weird behavior all
- * over the place. We are trying to basically
- * figure out three pieces of information.
- *
- * a) Clock Conversion Factor
- *
- * This is a representation of the input
- * crystal clock frequency going into the
- * ESP on this machine. Any operation whose
- * timing is longer than 400ns depends on this
- * value being correct. For example, you'll
- * get blips for arbitration/selection during
- * high load or with multiple targets if this
- * is not set correctly.
- *
- * b) Selection Time-Out
- *
- * The ESP isn't very bright and will arbitrate
- * for the bus and try to select a target
- * forever if you let it. This value tells
- * the ESP when it has taken too long to
- * negotiate and that it should interrupt
- * the CPU so we can see what happened.
- * The value is computed as follows (from
- * NCR/Symbios chip docs).
- *
- * (Time Out Period) * (Input Clock)
- * STO = ----------------------------------
- * (8192) * (Clock Conversion Factor)
- *
- * You usually want the time out period to be
- * around 250ms, I think we'll set it a little
- * bit higher to account for fully loaded SCSI
- * bus's and slow devices that don't respond so
- * quickly to selection attempts. (yeah, I know
- * this is out of spec. but there is a lot of
- * buggy pieces of firmware out there so bite me)
- *
- * c) Imperical constants for synchronous offset
- * and transfer period register values
- *
- * This entails the smallest and largest sync
- * period we could ever handle on this ESP.
- */
- fmhz = prom_getintdefault(prom_node, "clock-frequency", -1);
- if (fmhz == -1)
- fmhz = (!sbus_prom_node) ? 0 :
- prom_getintdefault(sbus_prom_node, "clock-frequency", -1);
- if (fmhz <= (5000000))
- ccf = 0;
- else
- ccf = (((5000000 - 1) + (fmhz))/(5000000));
- if (!ccf || ccf > 8) {
- /* If we can't find anything reasonable,
- * just assume 20MHZ. This is the clock
- * frequency of the older sun4c's where I've
- * been unable to find the clock-frequency
- * PROM property. All other machines provide
- * useful values it seems.
- */
- ccf = ESP_CCF_F4;
- fmhz = (20000000);
- }
- if (ccf == (ESP_CCF_F7 + 1))
- esp->cfact = ESP_CCF_F0;
- else if (ccf == ESP_CCF_NEVER)
- esp->cfact = ESP_CCF_F2;
- else
- esp->cfact = ccf;
- esp->raw_cfact = ccf;
- esp->cfreq = fmhz;
- esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz);
- esp->ctick = ESP_TICK(ccf, esp->ccycle);
- esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf);
- esp->sync_defp = SYNC_DEFP_SLOW;
- printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ",
- esp->scsi_id, (fmhz / 1000000),
- (int)esp->ccycle, (int)ccf, (int) esp->neg_defp);
- }
- static void __init esp_get_bursts(struct esp *esp, struct sbus_dev *dma)
- {
- struct sbus_dev *sdev = esp->sdev;
- u8 bursts;
- bursts = prom_getintdefault(esp->prom_node, "burst-sizes", 0xff);
- if (dma) {
- u8 tmp = prom_getintdefault(dma->prom_node,
- "burst-sizes", 0xff);
- if (tmp != 0xff)
- bursts &= tmp;
- }
- if (sdev->bus) {
- u8 tmp = prom_getintdefault(sdev->bus->prom_node,
- "burst-sizes", 0xff);
- if (tmp != 0xff)
- bursts &= tmp;
- }
- if (bursts == 0xff ||
- (bursts & DMA_BURST16) == 0 ||
- (bursts & DMA_BURST32) == 0)
- bursts = (DMA_BURST32 - 1);
- esp->bursts = bursts;
- }
- static void __init esp_get_revision(struct esp *esp)
- {
- u8 tmp;
- esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
- esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- tmp = sbus_readb(esp->eregs + ESP_CFG2);
- tmp &= ~ESP_CONFIG2_MAGIC;
- if (tmp != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
- /* If what we write to cfg2 does not come back, cfg2
- * is not implemented, therefore this must be a plain
- * esp100.
- */
- esp->erev = esp100;
- printk("NCR53C90(esp100)\n");
- } else {
- esp->config2 = 0;
- esp->prev_cfg3 = esp->config3[0] = 5;
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- sbus_writeb(0, esp->eregs + ESP_CFG3);
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- tmp = sbus_readb(esp->eregs + ESP_CFG3);
- if (tmp != 5) {
- /* The cfg2 register is implemented, however
- * cfg3 is not, must be esp100a.
- */
- esp->erev = esp100a;
- printk("NCR53C90A(esp100a)\n");
- } else {
- int target;
- for (target = 0; target < 16; target++)
- esp->config3[target] = 0;
- esp->prev_cfg3 = 0;
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- /* All of cfg{1,2,3} implemented, must be one of
- * the fas variants, figure out which one.
- */
- if (esp->raw_cfact > ESP_CCF_F5) {
- esp->erev = fast;
- esp->sync_defp = SYNC_DEFP_FAST;
- printk("NCR53C9XF(espfast)\n");
- } else {
- esp->erev = esp236;
- printk("NCR53C9x(esp236)\n");
- }
- esp->config2 = 0;
- sbus_writeb(esp->config2, esp->eregs + ESP_CFG2);
- }
- }
- }
- static void __init esp_init_swstate(struct esp *esp)
- {
- int i;
- /* Command queues... */
- esp->current_SC = NULL;
- esp->disconnected_SC = NULL;
- esp->issue_SC = NULL;
- /* Target and current command state... */
- esp->targets_present = 0;
- esp->resetting_bus = 0;
- esp->snip = 0;
- init_waitqueue_head(&esp->reset_queue);
- /* Debugging... */
- for(i = 0; i < 32; i++)
- esp->espcmdlog[i] = 0;
- esp->espcmdent = 0;
- /* MSG phase state... */
- for(i = 0; i < 16; i++) {
- esp->cur_msgout[i] = 0;
- esp->cur_msgin[i] = 0;
- }
- esp->prevmsgout = esp->prevmsgin = 0;
- esp->msgout_len = esp->msgin_len = 0;
- /* Clear the one behind caches to hold unmatchable values. */
- esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff;
- esp->prev_hme_dmacsr = 0xffffffff;
- }
- static int __init detect_one_esp(struct scsi_host_template *tpnt,
- struct device *dev,
- struct sbus_dev *esp_dev,
- struct sbus_dev *espdma,
- struct sbus_bus *sbus,
- int hme)
- {
- static int instance;
- struct Scsi_Host *esp_host = scsi_host_alloc(tpnt, sizeof(struct esp));
- struct esp *esp;
-
- if (!esp_host)
- return -ENOMEM;
- if (hme)
- esp_host->max_id = 16;
- esp = (struct esp *) esp_host->hostdata;
- esp->ehost = esp_host;
- esp->sdev = esp_dev;
- esp->esp_id = instance;
- esp->prom_node = esp_dev->prom_node;
- prom_getstring(esp->prom_node, "name", esp->prom_name,
- sizeof(esp->prom_name));
- if (esp_find_dvma(esp, espdma) < 0)
- goto fail_unlink;
- if (esp_map_regs(esp, hme) < 0) {
- printk("ESP registers unmappable");
- goto fail_dvma_release;
- }
- if (esp_map_cmdarea(esp) < 0) {
- printk("ESP DVMA transport area unmappable");
- goto fail_unmap_regs;
- }
- if (esp_register_irq(esp) < 0)
- goto fail_unmap_cmdarea;
- esp_get_scsi_id(esp);
- esp->diff = prom_getbool(esp->prom_node, "differential");
- if (esp->diff)
- printk("Differential ");
- esp_get_clock_params(esp);
- esp_get_bursts(esp, espdma);
- esp_get_revision(esp);
- esp_init_swstate(esp);
- esp_bootup_reset(esp);
- if (scsi_add_host(esp_host, dev))
- goto fail_free_irq;
- dev_set_drvdata(&esp_dev->ofdev.dev, esp);
- scsi_scan_host(esp_host);
- instance++;
- return 0;
- fail_free_irq:
- free_irq(esp->ehost->irq, esp);
- fail_unmap_cmdarea:
- sbus_free_consistent(esp->sdev, 16,
- (void *) esp->esp_command,
- esp->esp_command_dvma);
- fail_unmap_regs:
- sbus_iounmap(esp->eregs, ESP_REG_SIZE);
- fail_dvma_release:
- esp->dma->allocated = 0;
- fail_unlink:
- scsi_host_put(esp_host);
- return -1;
- }
- /* Detecting ESP chips on the machine. This is the simple and easy
- * version.
- */
- static int __devexit esp_remove_common(struct esp *esp)
- {
- unsigned int irq = esp->ehost->irq;
- scsi_remove_host(esp->ehost);
- ESP_INTSOFF(esp->dregs);
- #if 0
- esp_reset_dma(esp);
- esp_reset_esp(esp);
- #endif
- free_irq(irq, esp);
- sbus_free_consistent(esp->sdev, 16,
- (void *) esp->esp_command, esp->esp_command_dvma);
- sbus_iounmap(esp->eregs, ESP_REG_SIZE);
- esp->dma->allocated = 0;
- scsi_host_put(esp->ehost);
- return 0;
- }
- #ifdef CONFIG_SUN4
- #include <asm/sun4paddr.h>
- static struct sbus_dev sun4_esp_dev;
- static int __init esp_sun4_probe(struct scsi_host_template *tpnt)
- {
- if (sun4_esp_physaddr) {
- memset(&sun4_esp_dev, 0, sizeof(sun4_esp_dev));
- sun4_esp_dev.reg_addrs[0].phys_addr = sun4_esp_physaddr;
- sun4_esp_dev.irqs[0] = 4;
- sun4_esp_dev.resource[0].start = sun4_esp_physaddr;
- sun4_esp_dev.resource[0].end =
- sun4_esp_physaddr + ESP_REG_SIZE - 1;
- sun4_esp_dev.resource[0].flags = IORESOURCE_IO;
- return detect_one_esp(tpnt, NULL,
- &sun4_esp_dev, NULL, NULL, 0);
- }
- return 0;
- }
- static int __devexit esp_sun4_remove(void)
- {
- struct of_device *dev = &sun4_esp_dev.ofdev;
- struct esp *esp = dev_get_drvdata(&dev->dev);
- return esp_remove_common(esp);
- }
- #else /* !CONFIG_SUN4 */
- static int __devinit esp_sbus_probe(struct of_device *dev, const struct of_device_id *match)
- {
- struct sbus_dev *sdev = to_sbus_device(&dev->dev);
- struct device_node *dp = dev->node;
- struct sbus_dev *dma_sdev = NULL;
- int hme = 0;
- if (dp->parent &&
- (!strcmp(dp->parent->name, "espdma") ||
- !strcmp(dp->parent->name, "dma")))
- dma_sdev = sdev->parent;
- else if (!strcmp(dp->name, "SUNW,fas")) {
- dma_sdev = sdev;
- hme = 1;
- }
- return detect_one_esp(match->data, &dev->dev,
- sdev, dma_sdev, sdev->bus, hme);
- }
- static int __devexit esp_sbus_remove(struct of_device *dev)
- {
- struct esp *esp = dev_get_drvdata(&dev->dev);
- return esp_remove_common(esp);
- }
- #endif /* !CONFIG_SUN4 */
- /* The info function will return whatever useful
- * information the developer sees fit. If not provided, then
- * the name field will be used instead.
- */
- static const char *esp_info(struct Scsi_Host *host)
- {
- struct esp *esp;
- esp = (struct esp *) host->hostdata;
- switch (esp->erev) {
- case esp100:
- return "Sparc ESP100 (NCR53C90)";
- case esp100a:
- return "Sparc ESP100A (NCR53C90A)";
- case esp236:
- return "Sparc ESP236";
- case fas236:
- return "Sparc ESP236-FAST";
- case fashme:
- return "Sparc ESP366-HME";
- case fas100a:
- return "Sparc ESP100A-FAST";
- default:
- return "Bogon ESP revision";
- };
- }
- /* From Wolfgang Stanglmeier's NCR scsi driver. */
- struct info_str
- {
- char *buffer;
- int length;
- int offset;
- int pos;
- };
- static void copy_mem_info(struct info_str *info, char *data, int len)
- {
- if (info->pos + len > info->length)
- len = info->length - info->pos;
- if (info->pos + len < info->offset) {
- info->pos += len;
- return;
- }
- if (info->pos < info->offset) {
- data += (info->offset - info->pos);
- len -= (info->offset - info->pos);
- }
- if (len > 0) {
- memcpy(info->buffer + info->pos, data, len);
- info->pos += len;
- }
- }
- static int copy_info(struct info_str *info, char *fmt, ...)
- {
- va_list args;
- char buf[81];
- int len;
- va_start(args, fmt);
- len = vsprintf(buf, fmt, args);
- va_end(args);
- copy_mem_info(info, buf, len);
- return len;
- }
- static int esp_host_info(struct esp *esp, char *ptr, off_t offset, int len)
- {
- struct scsi_device *sdev;
- struct info_str info;
- int i;
- info.buffer = ptr;
- info.length = len;
- info.offset = offset;
- info.pos = 0;
- copy_info(&info, "Sparc ESP Host Adapter:\n");
- copy_info(&info, "\tPROM node\t\t%08x\n", (unsigned int) esp->prom_node);
- copy_info(&info, "\tPROM name\t\t%s\n", esp->prom_name);
- copy_info(&info, "\tESP Model\t\t");
- switch (esp->erev) {
- case esp100:
- copy_info(&info, "ESP100\n");
- break;
- case esp100a:
- copy_info(&info, "ESP100A\n");
- break;
- case esp236:
- copy_info(&info, "ESP236\n");
- break;
- case fas236:
- copy_info(&info, "FAS236\n");
- break;
- case fas100a:
- copy_info(&info, "FAS100A\n");
- break;
- case fast:
- copy_info(&info, "FAST\n");
- break;
- case fashme:
- copy_info(&info, "Happy Meal FAS\n");
- break;
- case espunknown:
- default:
- copy_info(&info, "Unknown!\n");
- break;
- };
- copy_info(&info, "\tDMA Revision\t\t");
- switch (esp->dma->revision) {
- case dvmarev0:
- copy_info(&info, "Rev 0\n");
- break;
- case dvmaesc1:
- copy_info(&info, "ESC Rev 1\n");
- break;
- case dvmarev1:
- copy_info(&info, "Rev 1\n");
- break;
- case dvmarev2:
- copy_info(&info, "Rev 2\n");
- break;
- case dvmarev3:
- copy_info(&info, "Rev 3\n");
- break;
- case dvmarevplus:
- copy_info(&info, "Rev 1+\n");
- break;
- case dvmahme:
- copy_info(&info, "Rev HME/FAS\n");
- break;
- default:
- copy_info(&info, "Unknown!\n");
- break;
- };
- copy_info(&info, "\tLive Targets\t\t[ ");
- for (i = 0; i < 15; i++) {
- if (esp->targets_present & (1 << i))
- copy_info(&info, "%d ", i);
- }
- copy_info(&info, "]\n\n");
-
- /* Now describe the state of each existing target. */
- copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
- shost_for_each_device(sdev, esp->ehost) {
- struct esp_device *esp_dev = sdev->hostdata;
- uint id = sdev->id;
- if (!(esp->targets_present & (1 << id)))
- continue;
- copy_info(&info, "%d\t\t", id);
- copy_info(&info, "%08lx\t", esp->config3[id]);
- copy_info(&info, "[%02lx,%02lx]\t\t\t",
- esp_dev->sync_max_offset,
- esp_dev->sync_min_period);
- copy_info(&info, "%s\t\t",
- esp_dev->disconnect ? "yes" : "no");
- copy_info(&info, "%s\n",
- (esp->config3[id] & ESP_CONFIG3_EWIDE) ? "yes" : "no");
- }
- return info.pos > info.offset? info.pos - info.offset : 0;
- }
- /* ESP proc filesystem code. */
- static int esp_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
- int length, int inout)
- {
- struct esp *esp = (struct esp *) host->hostdata;
- if (inout)
- return -EINVAL; /* not yet */
- if (start)
- *start = buffer;
- return esp_host_info(esp, buffer, offset, length);
- }
- static void esp_get_dmabufs(struct esp *esp, struct scsi_cmnd *sp)
- {
- if (sp->use_sg == 0) {
- sp->SCp.this_residual = sp->request_bufflen;
- sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
- sp->SCp.buffers_residual = 0;
- if (sp->request_bufflen) {
- sp->SCp.have_data_in = sbus_map_single(esp->sdev, sp->SCp.buffer,
- sp->SCp.this_residual,
- sp->sc_data_direction);
- sp->SCp.ptr = (char *) ((unsigned long)sp->SCp.have_data_in);
- } else {
- sp->SCp.ptr = NULL;
- }
- } else {
- sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
- sp->SCp.buffers_residual = sbus_map_sg(esp->sdev,
- sp->SCp.buffer,
- sp->use_sg,
- sp->sc_data_direction);
- sp->SCp.this_residual = sg_dma_len(sp->SCp.buffer);
- sp->SCp.ptr = (char *) ((unsigned long)sg_dma_address(sp->SCp.buffer));
- }
- }
- static void esp_release_dmabufs(struct esp *esp, struct scsi_cmnd *sp)
- {
- if (sp->use_sg) {
- sbus_unmap_sg(esp->sdev, sp->request_buffer, sp->use_sg,
- sp->sc_data_direction);
- } else if (sp->request_bufflen) {
- sbus_unmap_single(esp->sdev,
- sp->SCp.have_data_in,
- sp->request_bufflen,
- sp->sc_data_direction);
- }
- }
- static void esp_restore_pointers(struct esp *esp, struct scsi_cmnd *sp)
- {
- struct esp_pointers *ep = &esp->data_pointers[sp->device->id];
- sp->SCp.ptr = ep->saved_ptr;
- sp->SCp.buffer = ep->saved_buffer;
- sp->SCp.this_residual = ep->saved_this_residual;
- sp->SCp.buffers_residual = ep->saved_buffers_residual;
- }
- static void esp_save_pointers(struct esp *esp, struct scsi_cmnd *sp)
- {
- struct esp_pointers *ep = &esp->data_pointers[sp->device->id];
- ep->saved_ptr = sp->SCp.ptr;
- ep->saved_buffer = sp->SCp.buffer;
- ep->saved_this_residual = sp->SCp.this_residual;
- ep->saved_buffers_residual = sp->SCp.buffers_residual;
- }
- /* Some rules:
- *
- * 1) Never ever panic while something is live on the bus.
- * If there is to be any chance of syncing the disks this
- * rule is to be obeyed.
- *
- * 2) Any target that causes a foul condition will no longer
- * have synchronous transfers done to it, no questions
- * asked.
- *
- * 3) Keep register accesses to a minimum. Think about some
- * day when we have Xbus machines this is running on and
- * the ESP chip is on the other end of the machine on a
- * different board from the cpu where this is running.
- */
- /* Fire off a command. We assume the bus is free and that the only
- * case where we could see an interrupt is where we have disconnected
- * commands active and they are trying to reselect us.
- */
- static inline void esp_check_cmd(struct esp *esp, struct scsi_cmnd *sp)
- {
- switch (sp->cmd_len) {
- case 6:
- case 10:
- case 12:
- esp->esp_slowcmd = 0;
- break;
- default:
- esp->esp_slowcmd = 1;
- esp->esp_scmdleft = sp->cmd_len;
- esp->esp_scmdp = &sp->cmnd[0];
- break;
- };
- }
- static inline void build_sync_nego_msg(struct esp *esp, int period, int offset)
- {
- esp->cur_msgout[0] = EXTENDED_MESSAGE;
- esp->cur_msgout[1] = 3;
- esp->cur_msgout[2] = EXTENDED_SDTR;
- esp->cur_msgout[3] = period;
- esp->cur_msgout[4] = offset;
- esp->msgout_len = 5;
- }
- /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
- static inline void build_wide_nego_msg(struct esp *esp, int size)
- {
- esp->cur_msgout[0] = EXTENDED_MESSAGE;
- esp->cur_msgout[1] = 2;
- esp->cur_msgout[2] = EXTENDED_WDTR;
- switch (size) {
- case 32:
- esp->cur_msgout[3] = 2;
- break;
- case 16:
- esp->cur_msgout[3] = 1;
- break;
- case 8:
- default:
- esp->cur_msgout[3] = 0;
- break;
- };
- esp->msgout_len = 4;
- }
- static void esp_exec_cmd(struct esp *esp)
- {
- struct scsi_cmnd *SCptr;
- struct scsi_device *SDptr;
- struct esp_device *esp_dev;
- volatile u8 *cmdp = esp->esp_command;
- u8 the_esp_command;
- int lun, target;
- int i;
- /* Hold off if we have disconnected commands and
- * an IRQ is showing...
- */
- if (esp->disconnected_SC && ESP_IRQ_P(esp->dregs))
- return;
- /* Grab first member of the issue queue. */
- SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC);
- /* Safe to panic here because current_SC is null. */
- if (!SCptr)
- panic("esp: esp_exec_cmd and issue queue is NULL");
- SDptr = SCptr->device;
- esp_dev = SDptr->hostdata;
- lun = SCptr->device->lun;
- target = SCptr->device->id;
- esp->snip = 0;
- esp->msgout_len = 0;
- /* Send it out whole, or piece by piece? The ESP
- * only knows how to automatically send out 6, 10,
- * and 12 byte commands. I used to think that the
- * Linux SCSI code would never throw anything other
- * than that to us, but then again there is the
- * SCSI generic driver which can send us anything.
- */
- esp_check_cmd(esp, SCptr);
- /* If arbitration/selection is successful, the ESP will leave
- * ATN asserted, causing the target to go into message out
- * phase. The ESP will feed the target the identify and then
- * the target can only legally go to one of command,
- * datain/out, status, or message in phase, or stay in message
- * out phase (should we be trying to send a sync negotiation
- * message after the identify). It is not allowed to drop
- * BSY, but some buggy targets do and we check for this
- * condition in the selection complete code. Most of the time
- * we'll make the command bytes available to the ESP and it
- * will not interrupt us until it finishes command phase, we
- * cannot do this for command sizes the ESP does not
- * understand and in this case we'll get interrupted right
- * when the target goes into command phase.
- *
- * It is absolutely _illegal_ in the presence of SCSI-2 devices
- * to use the ESP select w/o ATN command. When SCSI-2 devices are
- * present on the bus we _must_ always go straight to message out
- * phase with an identify message for the target. Being that
- * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
- * selections should not confuse SCSI-1 we hope.
- */
- if (esp_dev->sync) {
- /* this targets sync is known */
- #ifndef __sparc_v9__
- do_sync_known:
- #endif
- if (esp_dev->disconnect)
- *cmdp++ = IDENTIFY(1, lun);
- else
- *cmdp++ = IDENTIFY(0, lun);
- if (esp->esp_slowcmd) {
- the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
- esp_advance_phase(SCptr, in_slct_stop);
- } else {
- the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
- esp_advance_phase(SCptr, in_slct_norm);
- }
- } else if (!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) {
- /* After the bootup SCSI code sends both the
- * TEST_UNIT_READY and INQUIRY commands we want
- * to at least attempt allowing the device to
- * disconnect.
- */
- ESPMISC(("esp: Selecting device for first time. target=%d "
- "lun=%d\n", target, SCptr->device->lun));
- if (!SDptr->borken && !esp_dev->disconnect)
- esp_dev->disconnect = 1;
- *cmdp++ = IDENTIFY(0, lun);
- esp->prevmsgout = NOP;
- esp_advance_phase(SCptr, in_slct_norm);
- the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
- /* Take no chances... */
- esp_dev->sync_max_offset = 0;
- esp_dev->sync_min_period = 0;
- } else {
- /* Sorry, I have had way too many problems with
- * various CDROM devices on ESP. -DaveM
- */
- int cdrom_hwbug_wkaround = 0;
- #ifndef __sparc_v9__
- /* Never allow disconnects or synchronous transfers on
- * SparcStation1 and SparcStation1+. Allowing those
- * to be enabled seems to lockup the machine completely.
- */
- if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
- (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
- /* But we are nice and allow tapes and removable
- * disks (but not CDROMs) to disconnect.
- */
- if(SDptr->type == TYPE_TAPE ||
- (SDptr->type != TYPE_ROM && SDptr->removable))
- esp_dev->disconnect = 1;
- else
- esp_dev->disconnect = 0;
- esp_dev->sync_max_offset = 0;
- esp_dev->sync_min_period = 0;
- esp_dev->sync = 1;
- esp->snip = 0;
- goto do_sync_known;
- }
- #endif /* !(__sparc_v9__) */
- /* We've talked to this guy before,
- * but never negotiated. Let's try,
- * need to attempt WIDE first, before
- * sync nego, as per SCSI 2 standard.
- */
- if (esp->erev == fashme && !esp_dev->wide) {
- if (!SDptr->borken &&
- SDptr->type != TYPE_ROM &&
- SDptr->removable == 0) {
- build_wide_nego_msg(esp, 16);
- esp_dev->wide = 1;
- esp->wnip = 1;
- goto after_nego_msg_built;
- } else {
- esp_dev->wide = 1;
- /* Fall through and try sync. */
- }
- }
- if (!SDptr->borken) {
- if ((SDptr->type == TYPE_ROM)) {
- /* Nice try sucker... */
- ESPMISC(("esp%d: Disabling sync for buggy "
- "CDROM.\n", esp->esp_id));
- cdrom_hwbug_wkaround = 1;
- build_sync_nego_msg(esp, 0, 0);
- } else if (SDptr->removable != 0) {
- ESPMISC(("esp%d: Not negotiating sync/wide but "
- "allowing disconnect for removable media.\n",
- esp->esp_id));
- build_sync_nego_msg(esp, 0, 0);
- } else {
- build_sync_nego_msg(esp, esp->sync_defp, 15);
- }
- } else {
- build_sync_nego_msg(esp, 0, 0);
- }
- esp_dev->sync = 1;
- esp->snip = 1;
- after_nego_msg_built:
- /* A fix for broken SCSI1 targets, when they disconnect
- * they lock up the bus and confuse ESP. So disallow
- * disconnects for SCSI1 targets for now until we
- * find a better fix.
- *
- * Addendum: This is funny, I figured out what was going
- * on. The blotzed SCSI1 target would disconnect,
- * one of the other SCSI2 targets or both would be
- * disconnected as well. The SCSI1 target would
- * stay disconnected long enough that we start
- * up a command on one of the SCSI2 targets. As
- * the ESP is arbitrating for the bus the SCSI1
- * target begins to arbitrate as well to reselect
- * the ESP. The SCSI1 target refuses to drop it's
- * ID bit on the data bus even though the ESP is
- * at ID 7 and is the obvious winner for any
- * arbitration. The ESP is a poor sport and refuses
- * to lose arbitration, it will continue indefinitely
- * trying to arbitrate for the bus and can only be
- * stopped via a chip reset or SCSI bus reset.
- * Therefore _no_ disconnects for SCSI1 targets
- * thank you very much. ;-)
- */
- if(((SDptr->scsi_level < 3) &&
- (SDptr->type != TYPE_TAPE) &&
- SDptr->removable == 0) ||
- cdrom_hwbug_wkaround || SDptr->borken) {
- ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d "
- "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
- esp_dev->disconnect = 0;
- *cmdp++ = IDENTIFY(0, lun);
- } else {
- *cmdp++ = IDENTIFY(1, lun);
- }
- /* ESP fifo is only so big...
- * Make this look like a slow command.
- */
- esp->esp_slowcmd = 1;
- esp->esp_scmdleft = SCptr->cmd_len;
- esp->esp_scmdp = &SCptr->cmnd[0];
- the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
- esp_advance_phase(SCptr, in_slct_msg);
- }
- if (!esp->esp_slowcmd)
- for (i = 0; i < SCptr->cmd_len; i++)
- *cmdp++ = SCptr->cmnd[i];
- /* HME sucks... */
- if (esp->erev == fashme)
- sbus_writeb((target & 0xf) | (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT),
- esp->eregs + ESP_BUSID);
- else
- sbus_writeb(target & 7, esp->eregs + ESP_BUSID);
- if (esp->prev_soff != esp_dev->sync_max_offset ||
- esp->prev_stp != esp_dev->sync_min_period ||
- (esp->erev > esp100a &&
- esp->prev_cfg3 != esp->config3[target])) {
- esp->prev_soff = esp_dev->sync_max_offset;
- esp->prev_stp = esp_dev->sync_min_period;
- sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
- sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
- if (esp->erev > esp100a) {
- esp->prev_cfg3 = esp->config3[target];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- }
- }
- i = (cmdp - esp->esp_command);
- if (esp->erev == fashme) {
- esp_cmd(esp, ESP_CMD_FLUSH); /* Grrr! */
- /* Set up the DMA and HME counters */
- sbus_writeb(i, esp->eregs + ESP_TCLOW);
- sbus_writeb(0, esp->eregs + ESP_TCMED);
- sbus_writeb(0, esp->eregs + FAS_RLO);
- sbus_writeb(0, esp->eregs + FAS_RHI);
- esp_cmd(esp, the_esp_command);
- /* Talk about touchy hardware... */
- esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
- (DMA_SCSI_DISAB | DMA_ENABLE)) &
- ~(DMA_ST_WRITE));
- sbus_writel(16, esp->dregs + DMA_COUNT);
- sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
- sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
- } else {
- u32 tmp;
- /* Set up the DMA and ESP counters */
- sbus_writeb(i, esp->eregs + ESP_TCLOW);
- sbus_writeb(0, esp->eregs + ESP_TCMED);
- tmp = sbus_readl(esp->dregs + DMA_CSR);
- tmp &= ~DMA_ST_WRITE;
- tmp |= DMA_ENABLE;
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- if (esp->dma->revision == dvmaesc1) {
- if (i) /* Workaround ESC gate array SBUS rerun bug. */
- sbus_writel(PAGE_SIZE, esp->dregs + DMA_COUNT);
- }
- sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
- /* Tell ESP to "go". */
- esp_cmd(esp, the_esp_command);
- }
- }
- /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
- static int esp_queue(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
- {
- struct esp *esp;
- /* Set up func ptr and initial driver cmd-phase. */
- SCpnt->scsi_done = done;
- SCpnt->SCp.phase = not_issued;
- /* We use the scratch area. */
- ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->device->lun));
- ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->device->lun));
- esp = (struct esp *) SCpnt->device->host->hostdata;
- esp_get_dmabufs(esp, SCpnt);
- esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */
- SCpnt->SCp.Status = CHECK_CONDITION;
- SCpnt->SCp.Message = 0xff;
- SCpnt->SCp.sent_command = 0;
- /* Place into our queue. */
- if (SCpnt->cmnd[0] == REQUEST_SENSE) {
- ESPQUEUE(("RQSENSE\n"));
- prepend_SC(&esp->issue_SC, SCpnt);
- } else {
- ESPQUEUE(("\n"));
- append_SC(&esp->issue_SC, SCpnt);
- }
- /* Run it now if we can. */
- if (!esp->current_SC && !esp->resetting_bus)
- esp_exec_cmd(esp);
- return 0;
- }
- /* Dump driver state. */
- static void esp_dump_cmd(struct scsi_cmnd *SCptr)
- {
- ESPLOG(("[tgt<%02x> lun<%02x> "
- "pphase<%s> cphase<%s>]",
- SCptr->device->id, SCptr->device->lun,
- phase_string(SCptr->SCp.sent_command),
- phase_string(SCptr->SCp.phase)));
- }
- static void esp_dump_state(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- #ifdef DEBUG_ESP_CMDS
- int i;
- #endif
- ESPLOG(("esp%d: dumping state\n", esp->esp_id));
- ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
- esp->esp_id,
- sbus_readl(esp->dregs + DMA_CSR),
- sbus_readl(esp->dregs + DMA_ADDR)));
- ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
- esp->esp_id, esp->sreg, esp->seqreg, esp->ireg));
- ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
- esp->esp_id,
- sbus_readb(esp->eregs + ESP_STATUS),
- sbus_readb(esp->eregs + ESP_SSTEP),
- sbus_readb(esp->eregs + ESP_INTRPT)));
- #ifdef DEBUG_ESP_CMDS
- printk("esp%d: last ESP cmds [", esp->esp_id);
- i = (esp->espcmdent - 1) & 31;
- printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
- i = (i - 1) & 31;
- printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
- i = (i - 1) & 31;
- printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
- i = (i - 1) & 31;
- printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">");
- printk("]\n");
- #endif /* (DEBUG_ESP_CMDS) */
- if (SCptr) {
- ESPLOG(("esp%d: current command ", esp->esp_id));
- esp_dump_cmd(SCptr);
- }
- ESPLOG(("\n"));
- SCptr = esp->disconnected_SC;
- ESPLOG(("esp%d: disconnected ", esp->esp_id));
- while (SCptr) {
- esp_dump_cmd(SCptr);
- SCptr = (struct scsi_cmnd *) SCptr->host_scribble;
- }
- ESPLOG(("\n"));
- }
- /* Abort a command. The host_lock is acquired by caller. */
- static int esp_abort(struct scsi_cmnd *SCptr)
- {
- struct esp *esp = (struct esp *) SCptr->device->host->hostdata;
- int don;
- ESPLOG(("esp%d: Aborting command\n", esp->esp_id));
- esp_dump_state(esp);
- /* Wheee, if this is the current command on the bus, the
- * best we can do is assert ATN and wait for msgout phase.
- * This should even fix a hung SCSI bus when we lose state
- * in the driver and timeout because the eventual phase change
- * will cause the ESP to (eventually) give an interrupt.
- */
- if (esp->current_SC == SCptr) {
- esp->cur_msgout[0] = ABORT;
- esp->msgout_len = 1;
- esp->msgout_ctr = 0;
- esp_cmd(esp, ESP_CMD_SATN);
- return SUCCESS;
- }
- /* If it is still in the issue queue then we can safely
- * call the completion routine and report abort success.
- */
- don = (sbus_readl(esp->dregs + DMA_CSR) & DMA_INT_ENAB);
- if (don) {
- ESP_INTSOFF(esp->dregs);
- }
- if (esp->issue_SC) {
- struct scsi_cmnd **prev, *this;
- for (prev = (&esp->issue_SC), this = esp->issue_SC;
- this != NULL;
- prev = (struct scsi_cmnd **) &(this->host_scribble),
- this = (struct scsi_cmnd *) this->host_scribble) {
- if (this == SCptr) {
- *prev = (struct scsi_cmnd *) this->host_scribble;
- this->host_scribble = NULL;
- esp_release_dmabufs(esp, this);
- this->result = DID_ABORT << 16;
- this->scsi_done(this);
- if (don)
- ESP_INTSON(esp->dregs);
- return SUCCESS;
- }
- }
- }
- /* Yuck, the command to abort is disconnected, it is not
- * worth trying to abort it now if something else is live
- * on the bus at this time. So, we let the SCSI code wait
- * a little bit and try again later.
- */
- if (esp->current_SC) {
- if (don)
- ESP_INTSON(esp->dregs);
- return FAILED;
- }
- /* It's disconnected, we have to reconnect to re-establish
- * the nexus and tell the device to abort. However, we really
- * cannot 'reconnect' per se. Don't try to be fancy, just
- * indicate failure, which causes our caller to reset the whole
- * bus.
- */
- if (don)
- ESP_INTSON(esp->dregs);
- return FAILED;
- }
- /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
- * arrived indicating the end of the SCSI bus reset. Our job
- * is to clean out the command queues and begin re-execution
- * of SCSI commands once more.
- */
- static int esp_finish_reset(struct esp *esp)
- {
- struct scsi_cmnd *sp = esp->current_SC;
- /* Clean up currently executing command, if any. */
- if (sp != NULL) {
- esp->current_SC = NULL;
- esp_release_dmabufs(esp, sp);
- sp->result = (DID_RESET << 16);
- sp->scsi_done(sp);
- }
- /* Clean up disconnected queue, they have been invalidated
- * by the bus reset.
- */
- if (esp->disconnected_SC) {
- while ((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) {
- esp_release_dmabufs(esp, sp);
- sp->result = (DID_RESET << 16);
- sp->scsi_done(sp);
- }
- }
- /* SCSI bus reset is complete. */
- esp->resetting_bus = 0;
- wake_up(&esp->reset_queue);
- /* Ok, now it is safe to get commands going once more. */
- if (esp->issue_SC)
- esp_exec_cmd(esp);
- return do_intr_end;
- }
- static int esp_do_resetbus(struct esp *esp)
- {
- ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id));
- esp->resetting_bus = 1;
- esp_cmd(esp, ESP_CMD_RS);
- return do_intr_end;
- }
- /* Reset ESP chip, reset hanging bus, then kill active and
- * disconnected commands for targets without soft reset.
- *
- * The host_lock is acquired by caller.
- */
- static int esp_reset(struct scsi_cmnd *SCptr)
- {
- struct esp *esp = (struct esp *) SCptr->device->host->hostdata;
- spin_lock_irq(esp->ehost->host_lock);
- (void) esp_do_resetbus(esp);
- spin_unlock_irq(esp->ehost->host_lock);
- wait_event(esp->reset_queue, (esp->resetting_bus == 0));
- return SUCCESS;
- }
- /* Internal ESP done function. */
- static void esp_done(struct esp *esp, int error)
- {
- struct scsi_cmnd *done_SC = esp->current_SC;
- esp->current_SC = NULL;
- esp_release_dmabufs(esp, done_SC);
- done_SC->result = error;
- done_SC->scsi_done(done_SC);
- /* Bus is free, issue any commands in the queue. */
- if (esp->issue_SC && !esp->current_SC)
- esp_exec_cmd(esp);
- }
- /* Wheee, ESP interrupt engine. */
- /* Forward declarations. */
- static int esp_do_phase_determine(struct esp *esp);
- static int esp_do_data_finale(struct esp *esp);
- static int esp_select_complete(struct esp *esp);
- static int esp_do_status(struct esp *esp);
- static int esp_do_msgin(struct esp *esp);
- static int esp_do_msgindone(struct esp *esp);
- static int esp_do_msgout(struct esp *esp);
- static int esp_do_cmdbegin(struct esp *esp);
- #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
- #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
- /* Read any bytes found in the FAS366 fifo, storing them into
- * the ESP driver software state structure.
- */
- static void hme_fifo_read(struct esp *esp)
- {
- u8 count = 0;
- u8 status = esp->sreg;
- /* Cannot safely frob the fifo for these following cases, but
- * we must always read the fifo when the reselect interrupt
- * is pending.
- */
- if (((esp->ireg & ESP_INTR_RSEL) == 0) &&
- (sreg_datainp(status) ||
- sreg_dataoutp(status) ||
- (esp->current_SC &&
- esp->current_SC->SCp.phase == in_data_done))) {
- ESPHME(("<wkaround_skipped>"));
- } else {
- unsigned long fcnt = sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES;
- /* The HME stores bytes in multiples of 2 in the fifo. */
- ESPHME(("hme_fifo[fcnt=%d", (int)fcnt));
- while (fcnt) {
- esp->hme_fifo_workaround_buffer[count++] =
- sbus_readb(esp->eregs + ESP_FDATA);
- esp->hme_fifo_workaround_buffer[count++] =
- sbus_readb(esp->eregs + ESP_FDATA);
- ESPHME(("<%02x,%02x>", esp->hme_fifo_workaround_buffer[count-2], esp->hme_fifo_workaround_buffer[count-1]));
- fcnt--;
- }
- if (sbus_readb(esp->eregs + ESP_STATUS2) & ESP_STAT2_F1BYTE) {
- ESPHME(("<poke_byte>"));
- sbus_writeb(0, esp->eregs + ESP_FDATA);
- esp->hme_fifo_workaround_buffer[count++] =
- sbus_readb(esp->eregs + ESP_FDATA);
- ESPHME(("<%02x,0x00>", esp->hme_fifo_workaround_buffer[count-1]));
- ESPHME(("CMD_FLUSH"));
- esp_cmd(esp, ESP_CMD_FLUSH);
- } else {
- ESPHME(("no_xtra_byte"));
- }
- }
- ESPHME(("wkarnd_cnt=%d]", (int)count));
- esp->hme_fifo_workaround_count = count;
- }
- static inline void hme_fifo_push(struct esp *esp, u8 *bytes, u8 count)
- {
- esp_cmd(esp, ESP_CMD_FLUSH);
- while (count) {
- u8 tmp = *bytes++;
- sbus_writeb(tmp, esp->eregs + ESP_FDATA);
- sbus_writeb(0, esp->eregs + ESP_FDATA);
- count--;
- }
- }
- /* We try to avoid some interrupts by jumping ahead and see if the ESP
- * has gotten far enough yet. Hence the following.
- */
- static inline int skipahead1(struct esp *esp, struct scsi_cmnd *scp,
- int prev_phase, int new_phase)
- {
- if (scp->SCp.sent_command != prev_phase)
- return 0;
- if (ESP_IRQ_P(esp->dregs)) {
- /* Yes, we are able to save an interrupt. */
- if (esp->erev == fashme)
- esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2);
- esp->sreg = (sbus_readb(esp->eregs + ESP_STATUS) & ~(ESP_STAT_INTR));
- esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT);
- if (esp->erev == fashme) {
- /* This chip is really losing. */
- ESPHME(("HME["));
- /* Must latch fifo before reading the interrupt
- * register else garbage ends up in the FIFO
- * which confuses the driver utterly.
- * Happy Meal indeed....
- */
- ESPHME(("fifo_workaround]"));
- if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
- (esp->sreg2 & ESP_STAT2_F1BYTE))
- hme_fifo_read(esp);
- }
- if (!(esp->ireg & ESP_INTR_SR))
- return 0;
- else
- return do_reset_complete;
- }
- /* Ho hum, target is taking forever... */
- scp->SCp.sent_command = new_phase; /* so we don't recurse... */
- return do_intr_end;
- }
- static inline int skipahead2(struct esp *esp, struct scsi_cmnd *scp,
- int prev_phase1, int prev_phase2, int new_phase)
- {
- if (scp->SCp.sent_command != prev_phase1 &&
- scp->SCp.sent_command != prev_phase2)
- return 0;
- if (ESP_IRQ_P(esp->dregs)) {
- /* Yes, we are able to save an interrupt. */
- if (esp->erev == fashme)
- esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2);
- esp->sreg = (sbus_readb(esp->eregs + ESP_STATUS) & ~(ESP_STAT_INTR));
- esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT);
- if (esp->erev == fashme) {
- /* This chip is really losing. */
- ESPHME(("HME["));
- /* Must latch fifo before reading the interrupt
- * register else garbage ends up in the FIFO
- * which confuses the driver utterly.
- * Happy Meal indeed....
- */
- ESPHME(("fifo_workaround]"));
- if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
- (esp->sreg2 & ESP_STAT2_F1BYTE))
- hme_fifo_read(esp);
- }
- if (!(esp->ireg & ESP_INTR_SR))
- return 0;
- else
- return do_reset_complete;
- }
- /* Ho hum, target is taking forever... */
- scp->SCp.sent_command = new_phase; /* so we don't recurse... */
- return do_intr_end;
- }
- /* Now some dma helpers. */
- static void dma_setup(struct esp *esp, __u32 addr, int count, int write)
- {
- u32 nreg = sbus_readl(esp->dregs + DMA_CSR);
- if (write)
- nreg |= DMA_ST_WRITE;
- else
- nreg &= ~(DMA_ST_WRITE);
- nreg |= DMA_ENABLE;
- sbus_writel(nreg, esp->dregs + DMA_CSR);
- if (esp->dma->revision == dvmaesc1) {
- /* This ESC gate array sucks! */
- __u32 src = addr;
- __u32 dest = src + count;
- if (dest & (PAGE_SIZE - 1))
- count = PAGE_ALIGN(count);
- sbus_writel(count, esp->dregs + DMA_COUNT);
- }
- sbus_writel(addr, esp->dregs + DMA_ADDR);
- }
- static void dma_drain(struct esp *esp)
- {
- u32 tmp;
- if (esp->dma->revision == dvmahme)
- return;
- if ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_FIFO_ISDRAIN) {
- switch (esp->dma->revision) {
- default:
- tmp |= DMA_FIFO_STDRAIN;
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- case dvmarev3:
- case dvmaesc1:
- while (sbus_readl(esp->dregs + DMA_CSR) & DMA_FIFO_ISDRAIN)
- udelay(1);
- };
- }
- }
- static void dma_invalidate(struct esp *esp)
- {
- u32 tmp;
- if (esp->dma->revision == dvmahme) {
- sbus_writel(DMA_RST_SCSI, esp->dregs + DMA_CSR);
- esp->prev_hme_dmacsr = ((esp->prev_hme_dmacsr |
- (DMA_PARITY_OFF | DMA_2CLKS |
- DMA_SCSI_DISAB | DMA_INT_ENAB)) &
- ~(DMA_ST_WRITE | DMA_ENABLE));
- sbus_writel(0, esp->dregs + DMA_CSR);
- sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
- /* This is necessary to avoid having the SCSI channel
- * engine lock up on us.
- */
- sbus_writel(0, esp->dregs + DMA_ADDR);
- } else {
- while ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_PEND_READ)
- udelay(1);
- tmp &= ~(DMA_ENABLE | DMA_ST_WRITE | DMA_BCNT_ENAB);
- tmp |= DMA_FIFO_INV;
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- tmp &= ~DMA_FIFO_INV;
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- }
- }
- static inline void dma_flashclear(struct esp *esp)
- {
- dma_drain(esp);
- dma_invalidate(esp);
- }
- static int dma_can_transfer(struct esp *esp, struct scsi_cmnd *sp)
- {
- __u32 base, end, sz;
- if (esp->dma->revision == dvmarev3) {
- sz = sp->SCp.this_residual;
- if (sz > 0x1000000)
- sz = 0x1000000;
- } else {
- base = ((__u32)((unsigned long)sp->SCp.ptr));
- base &= (0x1000000 - 1);
- end = (base + sp->SCp.this_residual);
- if (end > 0x1000000)
- end = 0x1000000;
- sz = (end - base);
- }
- return sz;
- }
- /* Misc. esp helper macros. */
- #define esp_setcount(__eregs, __cnt, __hme) \
- sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
- sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
- if (__hme) { \
- sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
- sbus_writeb(0, (__eregs) + FAS_RHI); \
- }
- #define esp_getcount(__eregs, __hme) \
- ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
- ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
- ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
- #define fcount(__esp) \
- (((__esp)->erev == fashme) ? \
- (__esp)->hme_fifo_workaround_count : \
- sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
- #define fnzero(__esp) \
- (((__esp)->erev == fashme) ? 0 : \
- sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
- /* XXX speculative nops unnecessary when continuing amidst a data phase
- * XXX even on esp100!!! another case of flooding the bus with I/O reg
- * XXX writes...
- */
- #define esp_maybe_nop(__esp) \
- if ((__esp)->erev == esp100) \
- esp_cmd((__esp), ESP_CMD_NULL)
- #define sreg_to_dataphase(__sreg) \
- ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
- /* The ESP100 when in synchronous data phase, can mistake a long final
- * REQ pulse from the target as an extra byte, it places whatever is on
- * the data lines into the fifo. For now, we will assume when this
- * happens that the target is a bit quirky and we don't want to
- * be talking synchronously to it anyways. Regardless, we need to
- * tell the ESP to eat the extraneous byte so that we can proceed
- * to the next phase.
- */
- static int esp100_sync_hwbug(struct esp *esp, struct scsi_cmnd *sp, int fifocnt)
- {
- /* Do not touch this piece of code. */
- if ((!(esp->erev == esp100)) ||
- (!(sreg_datainp((esp->sreg = sbus_readb(esp->eregs + ESP_STATUS))) &&
- !fifocnt) &&
- !(sreg_dataoutp(esp->sreg) && !fnzero(esp)))) {
- if (sp->SCp.phase == in_dataout)
- esp_cmd(esp, ESP_CMD_FLUSH);
- return 0;
- } else {
- /* Async mode for this guy. */
- build_sync_nego_msg(esp, 0, 0);
- /* Ack the bogus byte, but set ATN first. */
- esp_cmd(esp, ESP_CMD_SATN);
- esp_cmd(esp, ESP_CMD_MOK);
- return 1;
- }
- }
- /* This closes the window during a selection with a reselect pending, because
- * we use DMA for the selection process the FIFO should hold the correct
- * contents if we get reselected during this process. So we just need to
- * ack the possible illegal cmd interrupt pending on the esp100.
- */
- static inline int esp100_reconnect_hwbug(struct esp *esp)
- {
- u8 tmp;
- if (esp->erev != esp100)
- return 0;
- tmp = sbus_readb(esp->eregs + ESP_INTRPT);
- if (tmp & ESP_INTR_SR)
- return 1;
- return 0;
- }
- /* This verifies the BUSID bits during a reselection so that we know which
- * target is talking to us.
- */
- static inline int reconnect_target(struct esp *esp)
- {
- int it, me = esp->scsi_id_mask, targ = 0;
- if (2 != fcount(esp))
- return -1;
- if (esp->erev == fashme) {
- /* HME does not latch it's own BUS ID bits during
- * a reselection. Also the target number is given
- * as an unsigned char, not as a sole bit number
- * like the other ESP's do.
- * Happy Meal indeed....
- */
- targ = esp->hme_fifo_workaround_buffer[0];
- } else {
- it = sbus_readb(esp->eregs + ESP_FDATA);
- if (!(it & me))
- return -1;
- it &= ~me;
- if (it & (it - 1))
- return -1;
- while (!(it & 1))
- targ++, it >>= 1;
- }
- return targ;
- }
- /* This verifies the identify from the target so that we know which lun is
- * being reconnected.
- */
- static inline int reconnect_lun(struct esp *esp)
- {
- int lun;
- if ((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)
- return -1;
- if (esp->erev == fashme)
- lun = esp->hme_fifo_workaround_buffer[1];
- else
- lun = sbus_readb(esp->eregs + ESP_FDATA);
- /* Yes, you read this correctly. We report lun of zero
- * if we see parity error. ESP reports parity error for
- * the lun byte, and this is the only way to hope to recover
- * because the target is connected.
- */
- if (esp->sreg & ESP_STAT_PERR)
- return 0;
- /* Check for illegal bits being set in the lun. */
- if ((lun & 0x40) || !(lun & 0x80))
- return -1;
- return lun & 7;
- }
- /* This puts the driver in a state where it can revitalize a command that
- * is being continued due to reselection.
- */
- static inline void esp_connect(struct esp *esp, struct scsi_cmnd *sp)
- {
- struct esp_device *esp_dev = sp->device->hostdata;
- if (esp->prev_soff != esp_dev->sync_max_offset ||
- esp->prev_stp != esp_dev->sync_min_period ||
- (esp->erev > esp100a &&
- esp->prev_cfg3 != esp->config3[sp->device->id])) {
- esp->prev_soff = esp_dev->sync_max_offset;
- esp->prev_stp = esp_dev->sync_min_period;
- sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
- sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
- if (esp->erev > esp100a) {
- esp->prev_cfg3 = esp->config3[sp->device->id];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- }
- }
- esp->current_SC = sp;
- }
- /* This will place the current working command back into the issue queue
- * if we are to receive a reselection amidst a selection attempt.
- */
- static inline void esp_reconnect(struct esp *esp, struct scsi_cmnd *sp)
- {
- if (!esp->disconnected_SC)
- ESPLOG(("esp%d: Weird, being reselected but disconnected "
- "command queue is empty.\n", esp->esp_id));
- esp->snip = 0;
- esp->current_SC = NULL;
- sp->SCp.phase = not_issued;
- append_SC(&esp->issue_SC, sp);
- }
- /* Begin message in phase. */
- static int esp_do_msgin(struct esp *esp)
- {
- /* Must be very careful with the fifo on the HME */
- if ((esp->erev != fashme) ||
- !(sbus_readb(esp->eregs + ESP_STATUS2) & ESP_STAT2_FEMPTY))
- esp_cmd(esp, ESP_CMD_FLUSH);
- esp_maybe_nop(esp);
- esp_cmd(esp, ESP_CMD_TI);
- esp->msgin_len = 1;
- esp->msgin_ctr = 0;
- esp_advance_phase(esp->current_SC, in_msgindone);
- return do_work_bus;
- }
- /* This uses various DMA csr fields and the fifo flags count value to
- * determine how many bytes were successfully sent/received by the ESP.
- */
- static inline int esp_bytes_sent(struct esp *esp, int fifo_count)
- {
- int rval = sbus_readl(esp->dregs + DMA_ADDR) - esp->esp_command_dvma;
- if (esp->dma->revision == dvmarev1)
- rval -= (4 - ((sbus_readl(esp->dregs + DMA_CSR) & DMA_READ_AHEAD)>>11));
- return rval - fifo_count;
- }
- static inline void advance_sg(struct scsi_cmnd *sp)
- {
- ++sp->SCp.buffer;
- --sp->SCp.buffers_residual;
- sp->SCp.this_residual = sg_dma_len(sp->SCp.buffer);
- sp->SCp.ptr = (char *)((unsigned long)sg_dma_address(sp->SCp.buffer));
- }
- /* Please note that the way I've coded these routines is that I _always_
- * check for a disconnect during any and all information transfer
- * phases. The SCSI standard states that the target _can_ cause a BUS
- * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
- * that during information transfer phases the target controls every
- * change in phase, the only thing the initiator can do is "ask" for
- * a message out phase by driving ATN true. The target can, and sometimes
- * will, completely ignore this request so we cannot assume anything when
- * we try to force a message out phase to abort/reset a target. Most of
- * the time the target will eventually be nice and go to message out, so
- * we may have to hold on to our state about what we want to tell the target
- * for some period of time.
- */
- /* I think I have things working here correctly. Even partial transfers
- * within a buffer or sub-buffer should not upset us at all no matter
- * how bad the target and/or ESP fucks things up.
- */
- static int esp_do_data(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- int thisphase, hmuch;
- ESPDATA(("esp_do_data: "));
- esp_maybe_nop(esp);
- thisphase = sreg_to_dataphase(esp->sreg);
- esp_advance_phase(SCptr, thisphase);
- ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT"));
- hmuch = dma_can_transfer(esp, SCptr);
- if (hmuch > (64 * 1024) && (esp->erev != fashme))
- hmuch = (64 * 1024);
- ESPDATA(("hmuch<%d> ", hmuch));
- esp->current_transfer_size = hmuch;
- if (esp->erev == fashme) {
- u32 tmp = esp->prev_hme_dmacsr;
- /* Always set the ESP count registers first. */
- esp_setcount(esp->eregs, hmuch, 1);
- /* Get the DMA csr computed. */
- tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
- if (thisphase == in_datain)
- tmp |= DMA_ST_WRITE;
- else
- tmp &= ~(DMA_ST_WRITE);
- esp->prev_hme_dmacsr = tmp;
- ESPDATA(("DMA|TI --> do_intr_end\n"));
- if (thisphase == in_datain) {
- sbus_writel(hmuch, esp->dregs + DMA_COUNT);
- esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
- } else {
- esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
- sbus_writel(hmuch, esp->dregs + DMA_COUNT);
- }
- sbus_writel((__u32)((unsigned long)SCptr->SCp.ptr), esp->dregs+DMA_ADDR);
- sbus_writel(esp->prev_hme_dmacsr, esp->dregs + DMA_CSR);
- } else {
- esp_setcount(esp->eregs, hmuch, 0);
- dma_setup(esp, ((__u32)((unsigned long)SCptr->SCp.ptr)),
- hmuch, (thisphase == in_datain));
- ESPDATA(("DMA|TI --> do_intr_end\n"));
- esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
- }
- return do_intr_end;
- }
- /* See how successful the data transfer was. */
- static int esp_do_data_finale(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- struct esp_device *esp_dev = SCptr->device->hostdata;
- int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0;
- ESPDATA(("esp_do_data_finale: "));
- if (SCptr->SCp.phase == in_datain) {
- if (esp->sreg & ESP_STAT_PERR) {
- /* Yuck, parity error. The ESP asserts ATN
- * so that we can go to message out phase
- * immediately and inform the target that
- * something bad happened.
- */
- ESPLOG(("esp%d: data bad parity detected.\n",
- esp->esp_id));
- esp->cur_msgout[0] = INITIATOR_ERROR;
- esp->msgout_len = 1;
- }
- dma_drain(esp);
- }
- dma_invalidate(esp);
- /* This could happen for the above parity error case. */
- if (esp->ireg != ESP_INTR_BSERV) {
- /* Please go to msgout phase, please please please... */
- ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
- esp->esp_id));
- return esp_do_phase_determine(esp);
- }
- /* Check for partial transfers and other horrible events.
- * Note, here we read the real fifo flags register even
- * on HME broken adapters because we skip the HME fifo
- * workaround code in esp_handle() if we are doing data
- * phase things. We don't want to fuck directly with
- * the fifo like that, especially if doing synchronous
- * transfers! Also, will need to double the count on
- * HME if we are doing wide transfers, as the HME fifo
- * will move and count 16-bit quantities during wide data.
- * SMCC _and_ Qlogic can both bite me.
- */
- fifocnt = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES);
- if (esp->erev != fashme)
- ecount = esp_getcount(esp->eregs, 0);
- bytes_sent = esp->current_transfer_size;
- ESPDATA(("trans_sz(%d), ", bytes_sent));
- if (esp->erev == fashme) {
- if (!(esp->sreg & ESP_STAT_TCNT)) {
- ecount = esp_getcount(esp->eregs, 1);
- bytes_sent -= ecount;
- }
- /* Always subtract any cruft remaining in the FIFO. */
- if (esp->prev_cfg3 & ESP_CONFIG3_EWIDE)
- fifocnt <<= 1;
- if (SCptr->SCp.phase == in_dataout)
- bytes_sent -= fifocnt;
- /* I have an IBM disk which exhibits the following
- * behavior during writes to it. It disconnects in
- * the middle of a partial transfer, the current sglist
- * buffer is 1024 bytes, the disk stops data transfer
- * at 512 bytes.
- *
- * However the FAS366 reports that 32 more bytes were
- * transferred than really were. This is precisely
- * the size of a fully loaded FIFO in wide scsi mode.
- * The FIFO state recorded indicates that it is empty.
- *
- * I have no idea if this is a bug in the FAS366 chip
- * or a bug in the firmware on this IBM disk. In any
- * event the following seems to be a good workaround. -DaveM
- */
- if (bytes_sent != esp->current_transfer_size &&
- SCptr->SCp.phase == in_dataout) {
- int mask = (64 - 1);
- if ((esp->prev_cfg3 & ESP_CONFIG3_EWIDE) == 0)
- mask >>= 1;
- if (bytes_sent & mask)
- bytes_sent -= (bytes_sent & mask);
- }
- } else {
- if (!(esp->sreg & ESP_STAT_TCNT))
- bytes_sent -= ecount;
- if (SCptr->SCp.phase == in_dataout)
- bytes_sent -= fifocnt;
- }
- ESPDATA(("bytes_sent(%d), ", bytes_sent));
- /* If we were in synchronous mode, check for peculiarities. */
- if (esp->erev == fashme) {
- if (esp_dev->sync_max_offset) {
- if (SCptr->SCp.phase == in_dataout)
- esp_cmd(esp, ESP_CMD_FLUSH);
- } else {
- esp_cmd(esp, ESP_CMD_FLUSH);
- }
- } else {
- if (esp_dev->sync_max_offset)
- bogus_data = esp100_sync_hwbug(esp, SCptr, fifocnt);
- else
- esp_cmd(esp, ESP_CMD_FLUSH);
- }
- /* Until we are sure of what has happened, we are certainly
- * in the dark.
- */
- esp_advance_phase(SCptr, in_the_dark);
- if (bytes_sent < 0) {
- /* I've seen this happen due to lost state in this
- * driver. No idea why it happened, but allowing
- * this value to be negative caused things to
- * lock up. This allows greater chance of recovery.
- * In fact every time I've seen this, it has been
- * a driver bug without question.
- */
- ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id));
- ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
- esp->esp_id,
- esp->current_transfer_size, fifocnt, ecount));
- ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
- esp->esp_id,
- SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual));
- ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id,
- SCptr->device->id));
- SCptr->device->borken = 1;
- esp_dev->sync = 0;
- bytes_sent = 0;
- }
- /* Update the state of our transfer. */
- SCptr->SCp.ptr += bytes_sent;
- SCptr->SCp.this_residual -= bytes_sent;
- if (SCptr->SCp.this_residual < 0) {
- /* shit */
- ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id));
- SCptr->SCp.this_residual = 0;
- }
- /* Maybe continue. */
- if (!bogus_data) {
- ESPDATA(("!bogus_data, "));
- /* NO MATTER WHAT, we advance the scatterlist,
- * if the target should decide to disconnect
- * in between scatter chunks (which is common)
- * we could die horribly! I used to have the sg
- * advance occur only if we are going back into
- * (or are staying in) a data phase, you can
- * imagine the hell I went through trying to
- * figure this out.
- */
- if (SCptr->use_sg && !SCptr->SCp.this_residual)
- advance_sg(SCptr);
- if (sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) {
- ESPDATA(("to more data\n"));
- return esp_do_data(esp);
- }
- ESPDATA(("to new phase\n"));
- return esp_do_phase_determine(esp);
- }
- /* Bogus data, just wait for next interrupt. */
- ESPLOG(("esp%d: bogus_data during end of data phase\n",
- esp->esp_id));
- return do_intr_end;
- }
- /* We received a non-good status return at the end of
- * running a SCSI command. This is used to decide if
- * we should clear our synchronous transfer state for
- * such a device when that happens.
- *
- * The idea is that when spinning up a disk or rewinding
- * a tape, we don't want to go into a loop re-negotiating
- * synchronous capabilities over and over.
- */
- static int esp_should_clear_sync(struct scsi_cmnd *sp)
- {
- u8 cmd = sp->cmnd[0];
- /* These cases are for spinning up a disk and
- * waiting for that spinup to complete.
- */
- if (cmd == START_STOP)
- return 0;
- if (cmd == TEST_UNIT_READY)
- return 0;
- /* One more special case for SCSI tape drives,
- * this is what is used to probe the device for
- * completion of a rewind or tape load operation.
- */
- if (sp->device->type == TYPE_TAPE) {
- if (cmd == MODE_SENSE)
- return 0;
- }
- return 1;
- }
- /* Either a command is completing or a target is dropping off the bus
- * to continue the command in the background so we can do other work.
- */
- static int esp_do_freebus(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- struct esp_device *esp_dev = SCptr->device->hostdata;
- int rval;
- rval = skipahead2(esp, SCptr, in_status, in_msgindone, in_freeing);
- if (rval)
- return rval;
- if (esp->ireg != ESP_INTR_DC) {
- ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id));
- return do_reset_bus; /* target will not drop BSY... */
- }
- esp->msgout_len = 0;
- esp->prevmsgout = NOP;
- if (esp->prevmsgin == COMMAND_COMPLETE) {
- /* Normal end of nexus. */
- if (esp->disconnected_SC || (esp->erev == fashme))
- esp_cmd(esp, ESP_CMD_ESEL);
- if (SCptr->SCp.Status != GOOD &&
- SCptr->SCp.Status != CONDITION_GOOD &&
- ((1<<SCptr->device->id) & esp->targets_present) &&
- esp_dev->sync &&
- esp_dev->sync_max_offset) {
- /* SCSI standard says that the synchronous capabilities
- * should be renegotiated at this point. Most likely
- * we are about to request sense from this target
- * in which case we want to avoid using sync
- * transfers until we are sure of the current target
- * state.
- */
- ESPMISC(("esp: Status <%d> for target %d lun %d\n",
- SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun));
- /* But don't do this when spinning up a disk at
- * boot time while we poll for completion as it
- * fills up the console with messages. Also, tapes
- * can report not ready many times right after
- * loading up a tape.
- */
- if (esp_should_clear_sync(SCptr) != 0)
- esp_dev->sync = 0;
- }
- ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
- esp_done(esp, ((SCptr->SCp.Status & 0xff) |
- ((SCptr->SCp.Message & 0xff)<<8) |
- (DID_OK << 16)));
- } else if (esp->prevmsgin == DISCONNECT) {
- /* Normal disconnect. */
- esp_cmd(esp, ESP_CMD_ESEL);
- ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
- append_SC(&esp->disconnected_SC, SCptr);
- esp->current_SC = NULL;
- if (esp->issue_SC)
- esp_exec_cmd(esp);
- } else {
- /* Driver bug, we do not expect a disconnect here
- * and should not have advanced the state engine
- * to in_freeing.
- */
- ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
- esp->esp_id));
- return do_reset_bus;
- }
- return do_intr_end;
- }
- /* When a reselect occurs, and we cannot find the command to
- * reconnect to in our queues, we do this.
- */
- static int esp_bad_reconnect(struct esp *esp)
- {
- struct scsi_cmnd *sp;
- ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
- esp->esp_id));
- ESPLOG(("QUEUE DUMP\n"));
- sp = esp->issue_SC;
- ESPLOG(("esp%d: issue_SC[", esp->esp_id));
- while (sp) {
- ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
- sp = (struct scsi_cmnd *) sp->host_scribble;
- }
- ESPLOG(("]\n"));
- sp = esp->current_SC;
- ESPLOG(("esp%d: current_SC[", esp->esp_id));
- if (sp)
- ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
- else
- ESPLOG(("<NULL>"));
- ESPLOG(("]\n"));
- sp = esp->disconnected_SC;
- ESPLOG(("esp%d: disconnected_SC[", esp->esp_id));
- while (sp) {
- ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
- sp = (struct scsi_cmnd *) sp->host_scribble;
- }
- ESPLOG(("]\n"));
- return do_reset_bus;
- }
- /* Do the needy when a target tries to reconnect to us. */
- static int esp_do_reconnect(struct esp *esp)
- {
- int lun, target;
- struct scsi_cmnd *SCptr;
- /* Check for all bogus conditions first. */
- target = reconnect_target(esp);
- if (target < 0) {
- ESPDISC(("bad bus bits\n"));
- return do_reset_bus;
- }
- lun = reconnect_lun(esp);
- if (lun < 0) {
- ESPDISC(("target=%2x, bad identify msg\n", target));
- return do_reset_bus;
- }
- /* Things look ok... */
- ESPDISC(("R<%02x,%02x>", target, lun));
- /* Must not flush FIFO or DVMA on HME. */
- if (esp->erev != fashme) {
- esp_cmd(esp, ESP_CMD_FLUSH);
- if (esp100_reconnect_hwbug(esp))
- return do_reset_bus;
- esp_cmd(esp, ESP_CMD_NULL);
- }
- SCptr = remove_SC(&esp->disconnected_SC, (u8) target, (u8) lun);
- if (!SCptr)
- return esp_bad_reconnect(esp);
- esp_connect(esp, SCptr);
- esp_cmd(esp, ESP_CMD_MOK);
- if (esp->erev == fashme)
- sbus_writeb(((SCptr->device->id & 0xf) |
- (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT)),
- esp->eregs + ESP_BUSID);
- /* Reconnect implies a restore pointers operation. */
- esp_restore_pointers(esp, SCptr);
- esp->snip = 0;
- esp_advance_phase(SCptr, in_the_dark);
- return do_intr_end;
- }
- /* End of NEXUS (hopefully), pick up status + message byte then leave if
- * all goes well.
- */
- static int esp_do_status(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- int intr, rval;
- rval = skipahead1(esp, SCptr, in_the_dark, in_status);
- if (rval)
- return rval;
- intr = esp->ireg;
- ESPSTAT(("esp_do_status: "));
- if (intr != ESP_INTR_DC) {
- int message_out = 0; /* for parity problems */
- /* Ack the message. */
- ESPSTAT(("ack msg, "));
- esp_cmd(esp, ESP_CMD_MOK);
- if (esp->erev != fashme) {
- dma_flashclear(esp);
- /* Wait till the first bits settle. */
- while (esp->esp_command[0] == 0xff)
- udelay(1);
- } else {
- esp->esp_command[0] = esp->hme_fifo_workaround_buffer[0];
- esp->esp_command[1] = esp->hme_fifo_workaround_buffer[1];
- }
- ESPSTAT(("got something, "));
- /* ESP chimes in with one of
- *
- * 1) function done interrupt:
- * both status and message in bytes
- * are available
- *
- * 2) bus service interrupt:
- * only status byte was acquired
- *
- * 3) Anything else:
- * can't happen, but we test for it
- * anyways
- *
- * ALSO: If bad parity was detected on either
- * the status _or_ the message byte then
- * the ESP has asserted ATN on the bus
- * and we must therefore wait for the
- * next phase change.
- */
- if (intr & ESP_INTR_FDONE) {
- /* We got it all, hallejulia. */
- ESPSTAT(("got both, "));
- SCptr->SCp.Status = esp->esp_command[0];
- SCptr->SCp.Message = esp->esp_command[1];
- esp->prevmsgin = SCptr->SCp.Message;
- esp->cur_msgin[0] = SCptr->SCp.Message;
- if (esp->sreg & ESP_STAT_PERR) {
- /* There was bad parity for the
- * message byte, the status byte
- * was ok.
- */
- message_out = MSG_PARITY_ERROR;
- }
- } else if (intr == ESP_INTR_BSERV) {
- /* Only got status byte. */
- ESPLOG(("esp%d: got status only, ", esp->esp_id));
- if (!(esp->sreg & ESP_STAT_PERR)) {
- SCptr->SCp.Status = esp->esp_command[0];
- SCptr->SCp.Message = 0xff;
- } else {
- /* The status byte had bad parity.
- * we leave the scsi_pointer Status
- * field alone as we set it to a default
- * of CHECK_CONDITION in esp_queue.
- */
- message_out = INITIATOR_ERROR;
- }
- } else {
- /* This shouldn't happen ever. */
- ESPSTAT(("got bolixed\n"));
- esp_advance_phase(SCptr, in_the_dark);
- return esp_do_phase_determine(esp);
- }
- if (!message_out) {
- ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status,
- SCptr->SCp.Message));
- if (SCptr->SCp.Message == COMMAND_COMPLETE) {
- ESPSTAT(("and was COMMAND_COMPLETE\n"));
- esp_advance_phase(SCptr, in_freeing);
- return esp_do_freebus(esp);
- } else {
- ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
- esp->esp_id));
- esp->msgin_len = esp->msgin_ctr = 1;
- esp_advance_phase(SCptr, in_msgindone);
- return esp_do_msgindone(esp);
- }
- } else {
- /* With luck we'll be able to let the target
- * know that bad parity happened, it will know
- * which byte caused the problems and send it
- * again. For the case where the status byte
- * receives bad parity, I do not believe most
- * targets recover very well. We'll see.
- */
- ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
- esp->esp_id, message_out));
- esp->cur_msgout[0] = message_out;
- esp->msgout_len = esp->msgout_ctr = 1;
- esp_advance_phase(SCptr, in_the_dark);
- return esp_do_phase_determine(esp);
- }
- } else {
- /* If we disconnect now, all hell breaks loose. */
- ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id));
- esp_advance_phase(SCptr, in_the_dark);
- return esp_do_phase_determine(esp);
- }
- }
- static int esp_enter_status(struct esp *esp)
- {
- u8 thecmd = ESP_CMD_ICCSEQ;
- esp_cmd(esp, ESP_CMD_FLUSH);
- if (esp->erev != fashme) {
- u32 tmp;
- esp->esp_command[0] = esp->esp_command[1] = 0xff;
- sbus_writeb(2, esp->eregs + ESP_TCLOW);
- sbus_writeb(0, esp->eregs + ESP_TCMED);
- tmp = sbus_readl(esp->dregs + DMA_CSR);
- tmp |= (DMA_ST_WRITE | DMA_ENABLE);
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- if (esp->dma->revision == dvmaesc1)
- sbus_writel(0x100, esp->dregs + DMA_COUNT);
- sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
- thecmd |= ESP_CMD_DMA;
- }
- esp_cmd(esp, thecmd);
- esp_advance_phase(esp->current_SC, in_status);
- return esp_do_status(esp);
- }
- static int esp_disconnect_amidst_phases(struct esp *esp)
- {
- struct scsi_cmnd *sp = esp->current_SC;
- struct esp_device *esp_dev = sp->device->hostdata;
- /* This means real problems if we see this
- * here. Unless we were actually trying
- * to force the device to abort/reset.
- */
- ESPLOG(("esp%d Disconnect amidst phases, ", esp->esp_id));
- ESPLOG(("pphase<%s> cphase<%s>, ",
- phase_string(sp->SCp.phase),
- phase_string(sp->SCp.sent_command)));
- if (esp->disconnected_SC != NULL || (esp->erev == fashme))
- esp_cmd(esp, ESP_CMD_ESEL);
- switch (esp->cur_msgout[0]) {
- default:
- /* We didn't expect this to happen at all. */
- ESPLOG(("device is bolixed\n"));
- esp_advance_phase(sp, in_tgterror);
- esp_done(esp, (DID_ERROR << 16));
- break;
- case BUS_DEVICE_RESET:
- ESPLOG(("device reset successful\n"));
- esp_dev->sync_max_offset = 0;
- esp_dev->sync_min_period = 0;
- esp_dev->sync = 0;
- esp_advance_phase(sp, in_resetdev);
- esp_done(esp, (DID_RESET << 16));
- break;
- case ABORT:
- ESPLOG(("device abort successful\n"));
- esp_advance_phase(sp, in_abortone);
- esp_done(esp, (DID_ABORT << 16));
- break;
- };
- return do_intr_end;
- }
- static int esp_enter_msgout(struct esp *esp)
- {
- esp_advance_phase(esp->current_SC, in_msgout);
- return esp_do_msgout(esp);
- }
- static int esp_enter_msgin(struct esp *esp)
- {
- esp_advance_phase(esp->current_SC, in_msgin);
- return esp_do_msgin(esp);
- }
- static int esp_enter_cmd(struct esp *esp)
- {
- esp_advance_phase(esp->current_SC, in_cmdbegin);
- return esp_do_cmdbegin(esp);
- }
- static int esp_enter_badphase(struct esp *esp)
- {
- ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id,
- esp->sreg & ESP_STAT_PMASK));
- return do_reset_bus;
- }
- typedef int (*espfunc_t)(struct esp *);
- static espfunc_t phase_vector[] = {
- esp_do_data, /* ESP_DOP */
- esp_do_data, /* ESP_DIP */
- esp_enter_cmd, /* ESP_CMDP */
- esp_enter_status, /* ESP_STATP */
- esp_enter_badphase, /* ESP_STAT_PMSG */
- esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */
- esp_enter_msgout, /* ESP_MOP */
- esp_enter_msgin, /* ESP_MIP */
- };
- /* The target has control of the bus and we have to see where it has
- * taken us.
- */
- static int esp_do_phase_determine(struct esp *esp)
- {
- if ((esp->ireg & ESP_INTR_DC) != 0)
- return esp_disconnect_amidst_phases(esp);
- return phase_vector[esp->sreg & ESP_STAT_PMASK](esp);
- }
- /* First interrupt after exec'ing a cmd comes here. */
- static int esp_select_complete(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- struct esp_device *esp_dev = SCptr->device->hostdata;
- int cmd_bytes_sent, fcnt;
- if (esp->erev != fashme)
- esp->seqreg = (sbus_readb(esp->eregs + ESP_SSTEP) & ESP_STEP_VBITS);
- if (esp->erev == fashme)
- fcnt = esp->hme_fifo_workaround_count;
- else
- fcnt = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES);
- cmd_bytes_sent = esp_bytes_sent(esp, fcnt);
- dma_invalidate(esp);
- /* Let's check to see if a reselect happened
- * while we we're trying to select. This must
- * be checked first.
- */
- if (esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
- esp_reconnect(esp, SCptr);
- return esp_do_reconnect(esp);
- }
- /* Looks like things worked, we should see a bus service &
- * a function complete interrupt at this point. Note we
- * are doing a direct comparison because we don't want to
- * be fooled into thinking selection was successful if
- * ESP_INTR_DC is set, see below.
- */
- if (esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
- /* target speaks... */
- esp->targets_present |= (1<<SCptr->device->id);
- /* What if the target ignores the sdtr? */
- if (esp->snip)
- esp_dev->sync = 1;
- /* See how far, if at all, we got in getting
- * the information out to the target.
- */
- switch (esp->seqreg) {
- default:
- case ESP_STEP_ASEL:
- /* Arbitration won, target selected, but
- * we are in some phase which is not command
- * phase nor is it message out phase.
- *
- * XXX We've confused the target, obviously.
- * XXX So clear it's state, but we also end
- * XXX up clearing everyone elses. That isn't
- * XXX so nice. I'd like to just reset this
- * XXX target, but if I cannot even get it's
- * XXX attention and finish selection to talk
- * XXX to it, there is not much more I can do.
- * XXX If we have a loaded bus we're going to
- * XXX spend the next second or so renegotiating
- * XXX for synchronous transfers.
- */
- ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
- esp->esp_id, SCptr->device->id));
- case ESP_STEP_SID:
- /* Arbitration won, target selected, went
- * to message out phase, sent one message
- * byte, then we stopped. ATN is asserted
- * on the SCSI bus and the target is still
- * there hanging on. This is a legal
- * sequence step if we gave the ESP a select
- * and stop command.
- *
- * XXX See above, I could set the borken flag
- * XXX in the device struct and retry the
- * XXX command. But would that help for
- * XXX tagged capable targets?
- */
- case ESP_STEP_NCMD:
- /* Arbitration won, target selected, maybe
- * sent the one message byte in message out
- * phase, but we did not go to command phase
- * in the end. Actually, we could have sent
- * only some of the message bytes if we tried
- * to send out the entire identify and tag
- * message using ESP_CMD_SA3.
- */
- cmd_bytes_sent = 0;
- break;
- case ESP_STEP_PPC:
- /* No, not the powerPC pinhead. Arbitration
- * won, all message bytes sent if we went to
- * message out phase, went to command phase
- * but only part of the command was sent.
- *
- * XXX I've seen this, but usually in conjunction
- * XXX with a gross error which appears to have
- * XXX occurred between the time I told the
- * XXX ESP to arbitrate and when I got the
- * XXX interrupt. Could I have misloaded the
- * XXX command bytes into the fifo? Actually,
- * XXX I most likely missed a phase, and therefore
- * XXX went into never never land and didn't even
- * XXX know it. That was the old driver though.
- * XXX What is even more peculiar is that the ESP
- * XXX showed the proper function complete and
- * XXX bus service bits in the interrupt register.
- */
- case ESP_STEP_FINI4:
- case ESP_STEP_FINI5:
- case ESP_STEP_FINI6:
- case ESP_STEP_FINI7:
- /* Account for the identify message */
- if (SCptr->SCp.phase == in_slct_norm)
- cmd_bytes_sent -= 1;
- };
- if (esp->erev != fashme)
- esp_cmd(esp, ESP_CMD_NULL);
- /* Be careful, we could really get fucked during synchronous
- * data transfers if we try to flush the fifo now.
- */
- if ((esp->erev != fashme) && /* not a Happy Meal and... */
- !fcnt && /* Fifo is empty and... */
- /* either we are not doing synchronous transfers or... */
- (!esp_dev->sync_max_offset ||
- /* We are not going into data in phase. */
- ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
- esp_cmd(esp, ESP_CMD_FLUSH); /* flush is safe */
- /* See how far we got if this is not a slow command. */
- if (!esp->esp_slowcmd) {
- if (cmd_bytes_sent < 0)
- cmd_bytes_sent = 0;
- if (cmd_bytes_sent != SCptr->cmd_len) {
- /* Crapola, mark it as a slowcmd
- * so that we have some chance of
- * keeping the command alive with
- * good luck.
- *
- * XXX Actually, if we didn't send it all
- * XXX this means either we didn't set things
- * XXX up properly (driver bug) or the target
- * XXX or the ESP detected parity on one of
- * XXX the command bytes. This makes much
- * XXX more sense, and therefore this code
- * XXX should be changed to send out a
- * XXX parity error message or if the status
- * XXX register shows no parity error then
- * XXX just expect the target to bring the
- * XXX bus into message in phase so that it
- * XXX can send us the parity error message.
- * XXX SCSI sucks...
- */
- esp->esp_slowcmd = 1;
- esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]);
- esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent);
- }
- }
- /* Now figure out where we went. */
- esp_advance_phase(SCptr, in_the_dark);
- return esp_do_phase_determine(esp);
- }
- /* Did the target even make it? */
- if (esp->ireg == ESP_INTR_DC) {
- /* wheee... nobody there or they didn't like
- * what we told it to do, clean up.
- */
- /* If anyone is off the bus, but working on
- * a command in the background for us, tell
- * the ESP to listen for them.
- */
- if (esp->disconnected_SC)
- esp_cmd(esp, ESP_CMD_ESEL);
- if (((1<<SCptr->device->id) & esp->targets_present) &&
- esp->seqreg != 0 &&
- (esp->cur_msgout[0] == EXTENDED_MESSAGE) &&
- (SCptr->SCp.phase == in_slct_msg ||
- SCptr->SCp.phase == in_slct_stop)) {
- /* shit */
- esp->snip = 0;
- ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
- "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
- esp_dev->sync_max_offset = 0;
- esp_dev->sync_min_period = 0;
- esp_dev->sync = 1; /* so we don't negotiate again */
- /* Run the command again, this time though we
- * won't try to negotiate for synchronous transfers.
- *
- * XXX I'd like to do something like send an
- * XXX INITIATOR_ERROR or ABORT message to the
- * XXX target to tell it, "Sorry I confused you,
- * XXX please come back and I will be nicer next
- * XXX time". But that requires having the target
- * XXX on the bus, and it has dropped BSY on us.
- */
- esp->current_SC = NULL;
- esp_advance_phase(SCptr, not_issued);
- prepend_SC(&esp->issue_SC, SCptr);
- esp_exec_cmd(esp);
- return do_intr_end;
- }
- /* Ok, this is normal, this is what we see during boot
- * or whenever when we are scanning the bus for targets.
- * But first make sure that is really what is happening.
- */
- if (((1<<SCptr->device->id) & esp->targets_present)) {
- ESPLOG(("esp%d: Warning, live target %d not responding to "
- "selection.\n", esp->esp_id, SCptr->device->id));
- /* This _CAN_ happen. The SCSI standard states that
- * the target is to _not_ respond to selection if
- * _it_ detects bad parity on the bus for any reason.
- * Therefore, we assume that if we've talked successfully
- * to this target before, bad parity is the problem.
- */
- esp_done(esp, (DID_PARITY << 16));
- } else {
- /* Else, there really isn't anyone there. */
- ESPMISC(("esp: selection failure, maybe nobody there?\n"));
- ESPMISC(("esp: target %d lun %d\n",
- SCptr->device->id, SCptr->device->lun));
- esp_done(esp, (DID_BAD_TARGET << 16));
- }
- return do_intr_end;
- }
- ESPLOG(("esp%d: Selection failure.\n", esp->esp_id));
- printk("esp%d: Currently -- ", esp->esp_id);
- esp_print_ireg(esp->ireg); printk(" ");
- esp_print_statreg(esp->sreg); printk(" ");
- esp_print_seqreg(esp->seqreg); printk("\n");
- printk("esp%d: New -- ", esp->esp_id);
- esp->sreg = sbus_readb(esp->eregs + ESP_STATUS);
- esp->seqreg = sbus_readb(esp->eregs + ESP_SSTEP);
- esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT);
- esp_print_ireg(esp->ireg); printk(" ");
- esp_print_statreg(esp->sreg); printk(" ");
- esp_print_seqreg(esp->seqreg); printk("\n");
- ESPLOG(("esp%d: resetting bus\n", esp->esp_id));
- return do_reset_bus; /* ugh... */
- }
- /* Continue reading bytes for msgin phase. */
- static int esp_do_msgincont(struct esp *esp)
- {
- if (esp->ireg & ESP_INTR_BSERV) {
- /* in the right phase too? */
- if ((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) {
- /* phew... */
- esp_cmd(esp, ESP_CMD_TI);
- esp_advance_phase(esp->current_SC, in_msgindone);
- return do_intr_end;
- }
- /* We changed phase but ESP shows bus service,
- * in this case it is most likely that we, the
- * hacker who has been up for 20hrs straight
- * staring at the screen, drowned in coffee
- * smelling like retched cigarette ashes
- * have miscoded something..... so, try to
- * recover as best we can.
- */
- ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id));
- }
- esp_advance_phase(esp->current_SC, in_the_dark);
- return do_phase_determine;
- }
- static int check_singlebyte_msg(struct esp *esp)
- {
- esp->prevmsgin = esp->cur_msgin[0];
- if (esp->cur_msgin[0] & 0x80) {
- /* wheee... */
- ESPLOG(("esp%d: target sends identify amidst phases\n",
- esp->esp_id));
- esp_advance_phase(esp->current_SC, in_the_dark);
- return 0;
- } else if (((esp->cur_msgin[0] & 0xf0) == 0x20) ||
- (esp->cur_msgin[0] == EXTENDED_MESSAGE)) {
- esp->msgin_len = 2;
- esp_advance_phase(esp->current_SC, in_msgincont);
- return 0;
- }
- esp_advance_phase(esp->current_SC, in_the_dark);
- switch (esp->cur_msgin[0]) {
- default:
- /* We don't want to hear about it. */
- ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id,
- esp->cur_msgin[0]));
- return MESSAGE_REJECT;
- case NOP:
- ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id,
- esp->current_SC->device->id));
- return 0;
- case RESTORE_POINTERS:
- /* In this case we might also have to backup the
- * "slow command" pointer. It is rare to get such
- * a save/restore pointer sequence so early in the
- * bus transition sequences, but cover it.
- */
- if (esp->esp_slowcmd) {
- esp->esp_scmdleft = esp->current_SC->cmd_len;
- esp->esp_scmdp = &esp->current_SC->cmnd[0];
- }
- esp_restore_pointers(esp, esp->current_SC);
- return 0;
- case SAVE_POINTERS:
- esp_save_pointers(esp, esp->current_SC);
- return 0;
- case COMMAND_COMPLETE:
- case DISCONNECT:
- /* Freeing the bus, let it go. */
- esp->current_SC->SCp.phase = in_freeing;
- return 0;
- case MESSAGE_REJECT:
- ESPMISC(("msg reject, "));
- if (esp->prevmsgout == EXTENDED_MESSAGE) {
- struct esp_device *esp_dev = esp->current_SC->device->hostdata;
- /* Doesn't look like this target can
- * do synchronous or WIDE transfers.
- */
- ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
- esp_dev->sync = 1;
- esp_dev->wide = 1;
- esp_dev->sync_min_period = 0;
- esp_dev->sync_max_offset = 0;
- return 0;
- } else {
- ESPMISC(("not sync nego, sending ABORT\n"));
- return ABORT;
- }
- };
- }
- /* Target negotiates for synchronous transfers before we do, this
- * is legal although very strange. What is even funnier is that
- * the SCSI2 standard specifically recommends against targets doing
- * this because so many initiators cannot cope with this occurring.
- */
- static int target_with_ants_in_pants(struct esp *esp,
- struct scsi_cmnd *SCptr,
- struct esp_device *esp_dev)
- {
- if (esp_dev->sync || SCptr->device->borken) {
- /* sorry, no can do */
- ESPSDTR(("forcing to async, "));
- build_sync_nego_msg(esp, 0, 0);
- esp_dev->sync = 1;
- esp->snip = 1;
- ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id));
- esp_advance_phase(SCptr, in_the_dark);
- return EXTENDED_MESSAGE;
- }
- /* Ok, we'll check them out... */
- return 0;
- }
- static void sync_report(struct esp *esp)
- {
- int msg3, msg4;
- char *type;
- msg3 = esp->cur_msgin[3];
- msg4 = esp->cur_msgin[4];
- if (msg4) {
- int hz = 1000000000 / (msg3 * 4);
- int integer = hz / 1000000;
- int fraction = (hz - (integer * 1000000)) / 10000;
- if ((esp->erev == fashme) &&
- (esp->config3[esp->current_SC->device->id] & ESP_CONFIG3_EWIDE)) {
- type = "FAST-WIDE";
- integer <<= 1;
- fraction <<= 1;
- } else if ((msg3 * 4) < 200) {
- type = "FAST";
- } else {
- type = "synchronous";
- }
- /* Do not transform this back into one big printk
- * again, it triggers a bug in our sparc64-gcc272
- * sibling call optimization. -DaveM
- */
- ESPLOG((KERN_INFO "esp%d: target %d ",
- esp->esp_id, esp->current_SC->device->id));
- ESPLOG(("[period %dns offset %d %d.%02dMHz ",
- (int) msg3 * 4, (int) msg4,
- integer, fraction));
- ESPLOG(("%s SCSI%s]\n", type,
- (((msg3 * 4) < 200) ? "-II" : "")));
- } else {
- ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n",
- esp->esp_id, esp->current_SC->device->id));
- }
- }
- static int check_multibyte_msg(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- struct esp_device *esp_dev = SCptr->device->hostdata;
- u8 regval = 0;
- int message_out = 0;
- ESPSDTR(("chk multibyte msg: "));
- if (esp->cur_msgin[2] == EXTENDED_SDTR) {
- int period = esp->cur_msgin[3];
- int offset = esp->cur_msgin[4];
- ESPSDTR(("is sync nego response, "));
- if (!esp->snip) {
- int rval;
- /* Target negotiates first! */
- ESPSDTR(("target jumps the gun, "));
- message_out = EXTENDED_MESSAGE; /* we must respond */
- rval = target_with_ants_in_pants(esp, SCptr, esp_dev);
- if (rval)
- return rval;
- }
- ESPSDTR(("examining sdtr, "));
- /* Offset cannot be larger than ESP fifo size. */
- if (offset > 15) {
- ESPSDTR(("offset too big %2x, ", offset));
- offset = 15;
- ESPSDTR(("sending back new offset\n"));
- build_sync_nego_msg(esp, period, offset);
- return EXTENDED_MESSAGE;
- }
- if (offset && period > esp->max_period) {
- /* Yeee, async for this slow device. */
- ESPSDTR(("period too long %2x, ", period));
- build_sync_nego_msg(esp, 0, 0);
- ESPSDTR(("hoping for msgout\n"));
- esp_advance_phase(esp->current_SC, in_the_dark);
- return EXTENDED_MESSAGE;
- } else if (offset && period < esp->min_period) {
- ESPSDTR(("period too short %2x, ", period));
- period = esp->min_period;
- if (esp->erev > esp236)
- regval = 4;
- else
- regval = 5;
- } else if (offset) {
- int tmp;
- ESPSDTR(("period is ok, "));
- tmp = esp->ccycle / 1000;
- regval = (((period << 2) + tmp - 1) / tmp);
- if (regval && ((esp->erev == fas100a ||
- esp->erev == fas236 ||
- esp->erev == fashme))) {
- if (period >= 50)
- regval--;
- }
- }
- if (offset) {
- u8 bit;
- esp_dev->sync_min_period = (regval & 0x1f);
- esp_dev->sync_max_offset = (offset | esp->radelay);
- if (esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme) {
- if ((esp->erev == fas100a) || (esp->erev == fashme))
- bit = ESP_CONFIG3_FAST;
- else
- bit = ESP_CONFIG3_FSCSI;
- if (period < 50) {
- /* On FAS366, if using fast-20 synchronous transfers
- * we need to make sure the REQ/ACK assert/deassert
- * control bits are clear.
- */
- if (esp->erev == fashme)
- esp_dev->sync_max_offset &= ~esp->radelay;
- esp->config3[SCptr->device->id] |= bit;
- } else {
- esp->config3[SCptr->device->id] &= ~bit;
- }
- esp->prev_cfg3 = esp->config3[SCptr->device->id];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- }
- esp->prev_soff = esp_dev->sync_max_offset;
- esp->prev_stp = esp_dev->sync_min_period;
- sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
- sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
- ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
- esp_dev->sync_max_offset,
- esp_dev->sync_min_period,
- esp->config3[SCptr->device->id]));
- esp->snip = 0;
- } else if (esp_dev->sync_max_offset) {
- u8 bit;
- /* back to async mode */
- ESPSDTR(("unaccaptable sync nego, forcing async\n"));
- esp_dev->sync_max_offset = 0;
- esp_dev->sync_min_period = 0;
- esp->prev_soff = 0;
- esp->prev_stp = 0;
- sbus_writeb(esp->prev_soff, esp->eregs + ESP_SOFF);
- sbus_writeb(esp->prev_stp, esp->eregs + ESP_STP);
- if (esp->erev == fas100a || esp->erev == fas236 || esp->erev == fashme) {
- if ((esp->erev == fas100a) || (esp->erev == fashme))
- bit = ESP_CONFIG3_FAST;
- else
- bit = ESP_CONFIG3_FSCSI;
- esp->config3[SCptr->device->id] &= ~bit;
- esp->prev_cfg3 = esp->config3[SCptr->device->id];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- }
- }
- sync_report(esp);
- ESPSDTR(("chk multibyte msg: sync is known, "));
- esp_dev->sync = 1;
- if (message_out) {
- ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
- esp->esp_id));
- build_sync_nego_msg(esp, period, offset);
- esp_advance_phase(SCptr, in_the_dark);
- return EXTENDED_MESSAGE;
- }
- ESPSDTR(("returning zero\n"));
- esp_advance_phase(SCptr, in_the_dark); /* ...or else! */
- return 0;
- } else if (esp->cur_msgin[2] == EXTENDED_WDTR) {
- int size = 8 << esp->cur_msgin[3];
- esp->wnip = 0;
- if (esp->erev != fashme) {
- ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
- esp->esp_id));
- message_out = MESSAGE_REJECT;
- } else if (size > 16) {
- ESPLOG(("esp%d: AIEEE wide transfer for %d size "
- "not supported.\n", esp->esp_id, size));
- message_out = MESSAGE_REJECT;
- } else {
- /* Things look good; let's see what we got. */
- if (size == 16) {
- /* Set config 3 register for this target. */
- esp->config3[SCptr->device->id] |= ESP_CONFIG3_EWIDE;
- } else {
- /* Just make sure it was one byte sized. */
- if (size != 8) {
- ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
- esp->esp_id, size));
- message_out = MESSAGE_REJECT;
- goto finish;
- }
- /* Pure paranoia. */
- esp->config3[SCptr->device->id] &= ~(ESP_CONFIG3_EWIDE);
- }
- esp->prev_cfg3 = esp->config3[SCptr->device->id];
- sbus_writeb(esp->prev_cfg3, esp->eregs + ESP_CFG3);
- /* Regardless, next try for sync transfers. */
- build_sync_nego_msg(esp, esp->sync_defp, 15);
- esp_dev->sync = 1;
- esp->snip = 1;
- message_out = EXTENDED_MESSAGE;
- }
- } else if (esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) {
- ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id));
- message_out = MESSAGE_REJECT;
- }
- finish:
- esp_advance_phase(SCptr, in_the_dark);
- return message_out;
- }
- static int esp_do_msgindone(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- int message_out = 0, it = 0, rval;
- rval = skipahead1(esp, SCptr, in_msgin, in_msgindone);
- if (rval)
- return rval;
- if (SCptr->SCp.sent_command != in_status) {
- if (!(esp->ireg & ESP_INTR_DC)) {
- if (esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) {
- message_out = MSG_PARITY_ERROR;
- esp_cmd(esp, ESP_CMD_FLUSH);
- } else if (esp->erev != fashme &&
- (it = (sbus_readb(esp->eregs + ESP_FFLAGS) & ESP_FF_FBYTES)) != 1) {
- /* We certainly dropped the ball somewhere. */
- message_out = INITIATOR_ERROR;
- esp_cmd(esp, ESP_CMD_FLUSH);
- } else if (!esp->msgin_len) {
- if (esp->erev == fashme)
- it = esp->hme_fifo_workaround_buffer[0];
- else
- it = sbus_readb(esp->eregs + ESP_FDATA);
- esp_advance_phase(SCptr, in_msgincont);
- } else {
- /* it is ok and we want it */
- if (esp->erev == fashme)
- it = esp->cur_msgin[esp->msgin_ctr] =
- esp->hme_fifo_workaround_buffer[0];
- else
- it = esp->cur_msgin[esp->msgin_ctr] =
- sbus_readb(esp->eregs + ESP_FDATA);
- esp->msgin_ctr++;
- }
- } else {
- esp_advance_phase(SCptr, in_the_dark);
- return do_work_bus;
- }
- } else {
- it = esp->cur_msgin[0];
- }
- if (!message_out && esp->msgin_len) {
- if (esp->msgin_ctr < esp->msgin_len) {
- esp_advance_phase(SCptr, in_msgincont);
- } else if (esp->msgin_len == 1) {
- message_out = check_singlebyte_msg(esp);
- } else if (esp->msgin_len == 2) {
- if (esp->cur_msgin[0] == EXTENDED_MESSAGE) {
- if ((it + 2) >= 15) {
- message_out = MESSAGE_REJECT;
- } else {
- esp->msgin_len = (it + 2);
- esp_advance_phase(SCptr, in_msgincont);
- }
- } else {
- message_out = MESSAGE_REJECT; /* foo on you */
- }
- } else {
- message_out = check_multibyte_msg(esp);
- }
- }
- if (message_out < 0) {
- return -message_out;
- } else if (message_out) {
- if (((message_out != 1) &&
- ((message_out < 0x20) || (message_out & 0x80))))
- esp->msgout_len = 1;
- esp->cur_msgout[0] = message_out;
- esp_cmd(esp, ESP_CMD_SATN);
- esp_advance_phase(SCptr, in_the_dark);
- esp->msgin_len = 0;
- }
- esp->sreg = sbus_readb(esp->eregs + ESP_STATUS);
- esp->sreg &= ~(ESP_STAT_INTR);
- if ((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD))
- esp_cmd(esp, ESP_CMD_MOK);
- if ((SCptr->SCp.sent_command == in_msgindone) &&
- (SCptr->SCp.phase == in_freeing))
- return esp_do_freebus(esp);
- return do_intr_end;
- }
- static int esp_do_cmdbegin(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- esp_advance_phase(SCptr, in_cmdend);
- if (esp->erev == fashme) {
- u32 tmp = sbus_readl(esp->dregs + DMA_CSR);
- int i;
- for (i = 0; i < esp->esp_scmdleft; i++)
- esp->esp_command[i] = *esp->esp_scmdp++;
- esp->esp_scmdleft = 0;
- esp_cmd(esp, ESP_CMD_FLUSH);
- esp_setcount(esp->eregs, i, 1);
- esp_cmd(esp, (ESP_CMD_DMA | ESP_CMD_TI));
- tmp |= (DMA_SCSI_DISAB | DMA_ENABLE);
- tmp &= ~(DMA_ST_WRITE);
- sbus_writel(i, esp->dregs + DMA_COUNT);
- sbus_writel(esp->esp_command_dvma, esp->dregs + DMA_ADDR);
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- } else {
- u8 tmp;
- esp_cmd(esp, ESP_CMD_FLUSH);
- tmp = *esp->esp_scmdp++;
- esp->esp_scmdleft--;
- sbus_writeb(tmp, esp->eregs + ESP_FDATA);
- esp_cmd(esp, ESP_CMD_TI);
- }
- return do_intr_end;
- }
- static int esp_do_cmddone(struct esp *esp)
- {
- if (esp->erev == fashme)
- dma_invalidate(esp);
- else
- esp_cmd(esp, ESP_CMD_NULL);
- if (esp->ireg & ESP_INTR_BSERV) {
- esp_advance_phase(esp->current_SC, in_the_dark);
- return esp_do_phase_determine(esp);
- }
- ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
- esp->esp_id));
- return do_reset_bus;
- }
- static int esp_do_msgout(struct esp *esp)
- {
- esp_cmd(esp, ESP_CMD_FLUSH);
- switch (esp->msgout_len) {
- case 1:
- if (esp->erev == fashme)
- hme_fifo_push(esp, &esp->cur_msgout[0], 1);
- else
- sbus_writeb(esp->cur_msgout[0], esp->eregs + ESP_FDATA);
- esp_cmd(esp, ESP_CMD_TI);
- break;
- case 2:
- esp->esp_command[0] = esp->cur_msgout[0];
- esp->esp_command[1] = esp->cur_msgout[1];
- if (esp->erev == fashme) {
- hme_fifo_push(esp, &esp->cur_msgout[0], 2);
- esp_cmd(esp, ESP_CMD_TI);
- } else {
- dma_setup(esp, esp->esp_command_dvma, 2, 0);
- esp_setcount(esp->eregs, 2, 0);
- esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
- }
- break;
- case 4:
- esp->esp_command[0] = esp->cur_msgout[0];
- esp->esp_command[1] = esp->cur_msgout[1];
- esp->esp_command[2] = esp->cur_msgout[2];
- esp->esp_command[3] = esp->cur_msgout[3];
- esp->snip = 1;
- if (esp->erev == fashme) {
- hme_fifo_push(esp, &esp->cur_msgout[0], 4);
- esp_cmd(esp, ESP_CMD_TI);
- } else {
- dma_setup(esp, esp->esp_command_dvma, 4, 0);
- esp_setcount(esp->eregs, 4, 0);
- esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
- }
- break;
- case 5:
- esp->esp_command[0] = esp->cur_msgout[0];
- esp->esp_command[1] = esp->cur_msgout[1];
- esp->esp_command[2] = esp->cur_msgout[2];
- esp->esp_command[3] = esp->cur_msgout[3];
- esp->esp_command[4] = esp->cur_msgout[4];
- esp->snip = 1;
- if (esp->erev == fashme) {
- hme_fifo_push(esp, &esp->cur_msgout[0], 5);
- esp_cmd(esp, ESP_CMD_TI);
- } else {
- dma_setup(esp, esp->esp_command_dvma, 5, 0);
- esp_setcount(esp->eregs, 5, 0);
- esp_cmd(esp, ESP_CMD_DMA | ESP_CMD_TI);
- }
- break;
- default:
- /* whoops */
- ESPMISC(("bogus msgout sending NOP\n"));
- esp->cur_msgout[0] = NOP;
- if (esp->erev == fashme) {
- hme_fifo_push(esp, &esp->cur_msgout[0], 1);
- } else {
- sbus_writeb(esp->cur_msgout[0], esp->eregs + ESP_FDATA);
- }
- esp->msgout_len = 1;
- esp_cmd(esp, ESP_CMD_TI);
- break;
- };
- esp_advance_phase(esp->current_SC, in_msgoutdone);
- return do_intr_end;
- }
- static int esp_do_msgoutdone(struct esp *esp)
- {
- if (esp->msgout_len > 1) {
- /* XXX HME/FAS ATN deassert workaround required,
- * XXX no DMA flushing, only possible ESP_CMD_FLUSH
- * XXX to kill the fifo.
- */
- if (esp->erev != fashme) {
- u32 tmp;
- while ((tmp = sbus_readl(esp->dregs + DMA_CSR)) & DMA_PEND_READ)
- udelay(1);
- tmp &= ~DMA_ENABLE;
- sbus_writel(tmp, esp->dregs + DMA_CSR);
- dma_invalidate(esp);
- } else {
- esp_cmd(esp, ESP_CMD_FLUSH);
- }
- }
- if (!(esp->ireg & ESP_INTR_DC)) {
- if (esp->erev != fashme)
- esp_cmd(esp, ESP_CMD_NULL);
- switch (esp->sreg & ESP_STAT_PMASK) {
- case ESP_MOP:
- /* whoops, parity error */
- ESPLOG(("esp%d: still in msgout, parity error assumed\n",
- esp->esp_id));
- if (esp->msgout_len > 1)
- esp_cmd(esp, ESP_CMD_SATN);
- esp_advance_phase(esp->current_SC, in_msgout);
- return do_work_bus;
- case ESP_DIP:
- break;
- default:
- /* Happy Meal fifo is touchy... */
- if ((esp->erev != fashme) &&
- !fcount(esp) &&
- !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset))
- esp_cmd(esp, ESP_CMD_FLUSH);
- break;
- };
- } else {
- ESPLOG(("esp%d: disconnect, resetting bus\n", esp->esp_id));
- return do_reset_bus;
- }
- /* If we sent out a synchronous negotiation message, update
- * our state.
- */
- if (esp->cur_msgout[2] == EXTENDED_MESSAGE &&
- esp->cur_msgout[4] == EXTENDED_SDTR) {
- esp->snip = 1; /* anal retentiveness... */
- }
- esp->prevmsgout = esp->cur_msgout[0];
- esp->msgout_len = 0;
- esp_advance_phase(esp->current_SC, in_the_dark);
- return esp_do_phase_determine(esp);
- }
- static int esp_bus_unexpected(struct esp *esp)
- {
- ESPLOG(("esp%d: command in weird state %2x\n",
- esp->esp_id, esp->current_SC->SCp.phase));
- return do_reset_bus;
- }
- static espfunc_t bus_vector[] = {
- esp_do_data_finale,
- esp_do_data_finale,
- esp_bus_unexpected,
- esp_do_msgin,
- esp_do_msgincont,
- esp_do_msgindone,
- esp_do_msgout,
- esp_do_msgoutdone,
- esp_do_cmdbegin,
- esp_do_cmddone,
- esp_do_status,
- esp_do_freebus,
- esp_do_phase_determine,
- esp_bus_unexpected,
- esp_bus_unexpected,
- esp_bus_unexpected,
- };
- /* This is the second tier in our dual-level SCSI state machine. */
- static int esp_work_bus(struct esp *esp)
- {
- struct scsi_cmnd *SCptr = esp->current_SC;
- unsigned int phase;
- ESPBUS(("esp_work_bus: "));
- if (!SCptr) {
- ESPBUS(("reconnect\n"));
- return esp_do_reconnect(esp);
- }
- phase = SCptr->SCp.phase;
- if ((phase & 0xf0) == in_phases_mask)
- return bus_vector[(phase & 0x0f)](esp);
- else if ((phase & 0xf0) == in_slct_mask)
- return esp_select_complete(esp);
- else
- return esp_bus_unexpected(esp);
- }
- static espfunc_t isvc_vector[] = {
- NULL,
- esp_do_phase_determine,
- esp_do_resetbus,
- esp_finish_reset,
- esp_work_bus
- };
- /* Main interrupt handler for an esp adapter. */
- static void esp_handle(struct esp *esp)
- {
- struct scsi_cmnd *SCptr;
- int what_next = do_intr_end;
- SCptr = esp->current_SC;
- /* Check for errors. */
- esp->sreg = sbus_readb(esp->eregs + ESP_STATUS);
- esp->sreg &= (~ESP_STAT_INTR);
- if (esp->erev == fashme) {
- esp->sreg2 = sbus_readb(esp->eregs + ESP_STATUS2);
- esp->seqreg = (sbus_readb(esp->eregs + ESP_SSTEP) & ESP_STEP_VBITS);
- }
- if (esp->sreg & (ESP_STAT_SPAM)) {
- /* Gross error, could be due to one of:
- *
- * - top of fifo overwritten, could be because
- * we tried to do a synchronous transfer with
- * an offset greater than ESP fifo size
- *
- * - top of command register overwritten
- *
- * - DMA setup to go in one direction, SCSI
- * bus points in the other, whoops
- *
- * - weird phase change during asynchronous
- * data phase while we are initiator
- */
- ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg));
- /* If a command is live on the bus we cannot safely
- * reset the bus, so we'll just let the pieces fall
- * where they may. Here we are hoping that the
- * target will be able to cleanly go away soon
- * so we can safely reset things.
- */
- if (!SCptr) {
- ESPLOG(("esp%d: No current cmd during gross error, "
- "resetting bus\n", esp->esp_id));
- what_next = do_reset_bus;
- goto state_machine;
- }
- }
- if (sbus_readl(esp->dregs + DMA_CSR) & DMA_HNDL_ERROR) {
- /* A DMA gate array error. Here we must
- * be seeing one of two things. Either the
- * virtual to physical address translation
- * on the SBUS could not occur, else the
- * translation it did get pointed to a bogus
- * page. Ho hum...
- */
- ESPLOG(("esp%d: DMA error %08x\n", esp->esp_id,
- sbus_readl(esp->dregs + DMA_CSR)));
- /* DMA gate array itself must be reset to clear the
- * error condition.
- */
- esp_reset_dma(esp);
- what_next = do_reset_bus;
- goto state_machine;
- }
- esp->ireg = sbus_readb(esp->eregs + ESP_INTRPT); /* Unlatch intr reg */
- if (esp->erev == fashme) {
- /* This chip is really losing. */
- ESPHME(("HME["));
- ESPHME(("sreg2=%02x,", esp->sreg2));
- /* Must latch fifo before reading the interrupt
- * register else garbage ends up in the FIFO
- * which confuses the driver utterly.
- */
- if (!(esp->sreg2 & ESP_STAT2_FEMPTY) ||
- (esp->sreg2 & ESP_STAT2_F1BYTE)) {
- ESPHME(("fifo_workaround]"));
- hme_fifo_read(esp);
- } else {
- ESPHME(("no_fifo_workaround]"));
- }
- }
- /* No current cmd is only valid at this point when there are
- * commands off the bus or we are trying a reset.
- */
- if (!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) {
- /* Panic is safe, since current_SC is null. */
- ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id));
- panic("esp_handle: current_SC == penguin within interrupt!");
- }
- if (esp->ireg & (ESP_INTR_IC)) {
- /* Illegal command fed to ESP. Outside of obvious
- * software bugs that could cause this, there is
- * a condition with esp100 where we can confuse the
- * ESP into an erroneous illegal command interrupt
- * because it does not scrape the FIFO properly
- * for reselection. See esp100_reconnect_hwbug()
- * to see how we try very hard to avoid this.
- */
- ESPLOG(("esp%d: invalid command\n", esp->esp_id));
- esp_dump_state(esp);
- if (SCptr != NULL) {
- /* Devices with very buggy firmware can drop BSY
- * during a scatter list interrupt when using sync
- * mode transfers. We continue the transfer as
- * expected, the target drops the bus, the ESP
- * gets confused, and we get a illegal command
- * interrupt because the bus is in the disconnected
- * state now and ESP_CMD_TI is only allowed when
- * a nexus is alive on the bus.
- */
- ESPLOG(("esp%d: Forcing async and disabling disconnect for "
- "target %d\n", esp->esp_id, SCptr->device->id));
- SCptr->device->borken = 1; /* foo on you */
- }
- what_next = do_reset_bus;
- } else if (!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) {
- if (SCptr) {
- unsigned int phase = SCptr->SCp.phase;
- if (phase & in_phases_mask) {
- what_next = esp_work_bus(esp);
- } else if (phase & in_slct_mask) {
- what_next = esp_select_complete(esp);
- } else {
- ESPLOG(("esp%d: interrupt for no good reason...\n",
- esp->esp_id));
- what_next = do_intr_end;
- }
- } else {
- ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
- esp->esp_id));
- what_next = do_reset_bus;
- }
- } else if (esp->ireg & ESP_INTR_SR) {
- ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id));
- what_next = do_reset_complete;
- } else if (esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) {
- ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
- esp->esp_id));
- what_next = do_reset_bus;
- } else if (esp->ireg & ESP_INTR_RSEL) {
- if (SCptr == NULL) {
- /* This is ok. */
- what_next = esp_do_reconnect(esp);
- } else if (SCptr->SCp.phase & in_slct_mask) {
- /* Only selection code knows how to clean
- * up properly.
- */
- ESPDISC(("Reselected during selection attempt\n"));
- what_next = esp_select_complete(esp);
- } else {
- ESPLOG(("esp%d: Reselected while bus is busy\n",
- esp->esp_id));
- what_next = do_reset_bus;
- }
- }
- /* This is tier-one in our dual level SCSI state machine. */
- state_machine:
- while (what_next != do_intr_end) {
- if (what_next >= do_phase_determine &&
- what_next < do_intr_end) {
- what_next = isvc_vector[what_next](esp);
- } else {
- /* state is completely lost ;-( */
- ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
- esp->esp_id));
- what_next = do_reset_bus;
- }
- }
- }
- /* Service only the ESP described by dev_id. */
- static irqreturn_t esp_intr(int irq, void *dev_id)
- {
- struct esp *esp = dev_id;
- unsigned long flags;
- spin_lock_irqsave(esp->ehost->host_lock, flags);
- if (ESP_IRQ_P(esp->dregs)) {
- ESP_INTSOFF(esp->dregs);
- ESPIRQ(("I[%d:%d](", smp_processor_id(), esp->esp_id));
- esp_handle(esp);
- ESPIRQ((")"));
- ESP_INTSON(esp->dregs);
- }
- spin_unlock_irqrestore(esp->ehost->host_lock, flags);
- return IRQ_HANDLED;
- }
- static int esp_slave_alloc(struct scsi_device *SDptr)
- {
- struct esp_device *esp_dev =
- kmalloc(sizeof(struct esp_device), GFP_ATOMIC);
- if (!esp_dev)
- return -ENOMEM;
- memset(esp_dev, 0, sizeof(struct esp_device));
- SDptr->hostdata = esp_dev;
- return 0;
- }
- static void esp_slave_destroy(struct scsi_device *SDptr)
- {
- struct esp *esp = (struct esp *) SDptr->host->hostdata;
- esp->targets_present &= ~(1 << SDptr->id);
- kfree(SDptr->hostdata);
- SDptr->hostdata = NULL;
- }
- static struct scsi_host_template esp_template = {
- .module = THIS_MODULE,
- .name = "esp",
- .info = esp_info,
- .slave_alloc = esp_slave_alloc,
- .slave_destroy = esp_slave_destroy,
- .queuecommand = esp_queue,
- .eh_abort_handler = esp_abort,
- .eh_bus_reset_handler = esp_reset,
- .can_queue = 7,
- .this_id = 7,
- .sg_tablesize = SG_ALL,
- .cmd_per_lun = 1,
- .use_clustering = ENABLE_CLUSTERING,
- .proc_name = "esp",
- .proc_info = esp_proc_info,
- };
- #ifndef CONFIG_SUN4
- static struct of_device_id esp_match[] = {
- {
- .name = "SUNW,esp",
- .data = &esp_template,
- },
- {
- .name = "SUNW,fas",
- .data = &esp_template,
- },
- {
- .name = "esp",
- .data = &esp_template,
- },
- {},
- };
- MODULE_DEVICE_TABLE(of, esp_match);
- static struct of_platform_driver esp_sbus_driver = {
- .name = "esp",
- .match_table = esp_match,
- .probe = esp_sbus_probe,
- .remove = __devexit_p(esp_sbus_remove),
- };
- #endif
- static int __init esp_init(void)
- {
- #ifdef CONFIG_SUN4
- return esp_sun4_probe(&esp_template);
- #else
- return of_register_driver(&esp_sbus_driver, &sbus_bus_type);
- #endif
- }
- static void __exit esp_exit(void)
- {
- #ifdef CONFIG_SUN4
- esp_sun4_remove();
- #else
- of_unregister_driver(&esp_sbus_driver);
- #endif
- }
- MODULE_DESCRIPTION("ESP Sun SCSI driver");
- MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
- MODULE_LICENSE("GPL");
- MODULE_VERSION(DRV_VERSION);
- module_init(esp_init);
- module_exit(esp_exit);
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