pata_sc1200.c 8.0 KB

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  1. /*
  2. * New ATA layer SC1200 driver Alan Cox <alan@redhat.com>
  3. *
  4. * TODO: Mode selection filtering
  5. * TODO: Can't enable second channel until ATA core has serialize
  6. * TODO: Needs custom DMA cleanup code
  7. *
  8. * Based very heavily on
  9. *
  10. * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
  11. *
  12. * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
  13. * May be copied or modified under the terms of the GNU General Public License
  14. *
  15. * Development of this chipset driver was funded
  16. * by the nice folks at National Semiconductor.
  17. *
  18. * This program is free software; you can redistribute it and/or modify
  19. * it under the terms of the GNU General Public License version 2 as
  20. * published by the Free Software Foundation.
  21. *
  22. * This program is distributed in the hope that it will be useful,
  23. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  25. * GNU General Public License for more details.
  26. *
  27. * You should have received a copy of the GNU General Public License
  28. * along with this program; if not, write to the Free Software
  29. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  30. *
  31. */
  32. #include <linux/kernel.h>
  33. #include <linux/module.h>
  34. #include <linux/pci.h>
  35. #include <linux/init.h>
  36. #include <linux/blkdev.h>
  37. #include <linux/delay.h>
  38. #include <scsi/scsi_host.h>
  39. #include <linux/libata.h>
  40. #define DRV_NAME "sc1200"
  41. #define DRV_VERSION "0.2.4"
  42. #define SC1200_REV_A 0x00
  43. #define SC1200_REV_B1 0x01
  44. #define SC1200_REV_B3 0x02
  45. #define SC1200_REV_C1 0x03
  46. #define SC1200_REV_D1 0x04
  47. /**
  48. * sc1200_clock - PCI clock
  49. *
  50. * Return the PCI bus clocking for the SC1200 chipset configuration
  51. * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
  52. */
  53. static int sc1200_clock(void)
  54. {
  55. /* Magic registers that give us the chipset data */
  56. u8 chip_id = inb(0x903C);
  57. u8 silicon_rev = inb(0x903D);
  58. u16 pci_clock;
  59. if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
  60. return 0; /* 33 MHz mode */
  61. /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
  62. 0/3 is 33Mhz 1 is 48 2 is 66 */
  63. pci_clock = inw(0x901E);
  64. pci_clock >>= 8;
  65. pci_clock &= 0x03;
  66. if (pci_clock == 3)
  67. pci_clock = 0;
  68. return pci_clock;
  69. }
  70. /**
  71. * sc1200_set_piomode - PIO setup
  72. * @ap: ATA interface
  73. * @adev: device on the interface
  74. *
  75. * Set our PIO requirements. This is fairly simple on the SC1200
  76. */
  77. static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
  78. {
  79. static const u32 pio_timings[4][5] = {
  80. {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
  81. {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
  82. {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
  83. {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz
  84. };
  85. struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  86. u32 format;
  87. unsigned int reg = 0x40 + 0x10 * ap->port_no;
  88. int mode = adev->pio_mode - XFER_PIO_0;
  89. pci_read_config_dword(pdev, reg + 4, &format);
  90. format >>= 31;
  91. format += sc1200_clock();
  92. pci_write_config_dword(pdev, reg + 8 * adev->devno,
  93. pio_timings[format][mode]);
  94. }
  95. /**
  96. * sc1200_set_dmamode - DMA timing setup
  97. * @ap: ATA interface
  98. * @adev: Device being configured
  99. *
  100. * We cannot mix MWDMA and UDMA without reloading timings each switch
  101. * master to slave.
  102. */
  103. static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
  104. {
  105. static const u32 udma_timing[3][3] = {
  106. { 0x00921250, 0x00911140, 0x00911030 },
  107. { 0x00932470, 0x00922260, 0x00922140 },
  108. { 0x009436A1, 0x00933481, 0x00923261 }
  109. };
  110. static const u32 mwdma_timing[3][3] = {
  111. { 0x00077771, 0x00012121, 0x00002020 },
  112. { 0x000BBBB2, 0x00024241, 0x00013131 },
  113. { 0x000FFFF3, 0x00035352, 0x00015151 }
  114. };
  115. int clock = sc1200_clock();
  116. struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  117. unsigned int reg = 0x40 + 0x10 * ap->port_no;
  118. int mode = adev->dma_mode;
  119. u32 format;
  120. if (mode >= XFER_UDMA_0)
  121. format = udma_timing[clock][mode - XFER_UDMA_0];
  122. else
  123. format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
  124. if (adev->devno == 0) {
  125. u32 timings;
  126. pci_read_config_dword(pdev, reg + 4, &timings);
  127. timings &= 0x80000000UL;
  128. timings |= format;
  129. pci_write_config_dword(pdev, reg + 4, timings);
  130. } else
  131. pci_write_config_dword(pdev, reg + 12, format);
  132. }
  133. /**
  134. * sc1200_qc_issue_prot - command issue
  135. * @qc: command pending
  136. *
  137. * Called when the libata layer is about to issue a command. We wrap
  138. * this interface so that we can load the correct ATA timings if
  139. * neccessary. Specifically we have a problem that there is only
  140. * one MWDMA/UDMA bit.
  141. */
  142. static unsigned int sc1200_qc_issue_prot(struct ata_queued_cmd *qc)
  143. {
  144. struct ata_port *ap = qc->ap;
  145. struct ata_device *adev = qc->dev;
  146. struct ata_device *prev = ap->private_data;
  147. /* See if the DMA settings could be wrong */
  148. if (adev->dma_mode != 0 && adev != prev && prev != NULL) {
  149. /* Maybe, but do the channels match MWDMA/UDMA ? */
  150. if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) ||
  151. (adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))
  152. /* Switch the mode bits */
  153. sc1200_set_dmamode(ap, adev);
  154. }
  155. return ata_qc_issue_prot(qc);
  156. }
  157. static struct scsi_host_template sc1200_sht = {
  158. .module = THIS_MODULE,
  159. .name = DRV_NAME,
  160. .ioctl = ata_scsi_ioctl,
  161. .queuecommand = ata_scsi_queuecmd,
  162. .can_queue = ATA_DEF_QUEUE,
  163. .this_id = ATA_SHT_THIS_ID,
  164. .sg_tablesize = LIBATA_MAX_PRD,
  165. .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
  166. .emulated = ATA_SHT_EMULATED,
  167. .use_clustering = ATA_SHT_USE_CLUSTERING,
  168. .proc_name = DRV_NAME,
  169. .dma_boundary = ATA_DMA_BOUNDARY,
  170. .slave_configure = ata_scsi_slave_config,
  171. .slave_destroy = ata_scsi_slave_destroy,
  172. .bios_param = ata_std_bios_param,
  173. #ifdef CONFIG_PM
  174. .resume = ata_scsi_device_resume,
  175. .suspend = ata_scsi_device_suspend,
  176. #endif
  177. };
  178. static struct ata_port_operations sc1200_port_ops = {
  179. .port_disable = ata_port_disable,
  180. .set_piomode = sc1200_set_piomode,
  181. .set_dmamode = sc1200_set_dmamode,
  182. .mode_filter = ata_pci_default_filter,
  183. .tf_load = ata_tf_load,
  184. .tf_read = ata_tf_read,
  185. .check_status = ata_check_status,
  186. .exec_command = ata_exec_command,
  187. .dev_select = ata_std_dev_select,
  188. .freeze = ata_bmdma_freeze,
  189. .thaw = ata_bmdma_thaw,
  190. .error_handler = ata_bmdma_error_handler,
  191. .post_internal_cmd = ata_bmdma_post_internal_cmd,
  192. .bmdma_setup = ata_bmdma_setup,
  193. .bmdma_start = ata_bmdma_start,
  194. .bmdma_stop = ata_bmdma_stop,
  195. .bmdma_status = ata_bmdma_status,
  196. .qc_prep = ata_qc_prep,
  197. .qc_issue = sc1200_qc_issue_prot,
  198. .data_xfer = ata_data_xfer,
  199. .irq_handler = ata_interrupt,
  200. .irq_clear = ata_bmdma_irq_clear,
  201. .irq_on = ata_irq_on,
  202. .irq_ack = ata_irq_ack,
  203. .port_start = ata_port_start,
  204. };
  205. /**
  206. * sc1200_init_one - Initialise an SC1200
  207. * @dev: PCI device
  208. * @id: Entry in match table
  209. *
  210. * Just throw the needed data at the libata helper and it does all
  211. * our work.
  212. */
  213. static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
  214. {
  215. static struct ata_port_info info = {
  216. .sht = &sc1200_sht,
  217. .flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
  218. .pio_mask = 0x1f,
  219. .mwdma_mask = 0x07,
  220. .udma_mask = 0x07,
  221. .port_ops = &sc1200_port_ops
  222. };
  223. static struct ata_port_info *port_info[2] = { &info, &info };
  224. /* Can't enable port 2 yet, see top comments */
  225. return ata_pci_init_one(dev, port_info, 1);
  226. }
  227. static const struct pci_device_id sc1200[] = {
  228. { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
  229. { },
  230. };
  231. static struct pci_driver sc1200_pci_driver = {
  232. .name = DRV_NAME,
  233. .id_table = sc1200,
  234. .probe = sc1200_init_one,
  235. .remove = ata_pci_remove_one,
  236. #ifdef CONFIG_PM
  237. .suspend = ata_pci_device_suspend,
  238. .resume = ata_pci_device_resume,
  239. #endif
  240. };
  241. static int __init sc1200_init(void)
  242. {
  243. return pci_register_driver(&sc1200_pci_driver);
  244. }
  245. static void __exit sc1200_exit(void)
  246. {
  247. pci_unregister_driver(&sc1200_pci_driver);
  248. }
  249. MODULE_AUTHOR("Alan Cox, Mark Lord");
  250. MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
  251. MODULE_LICENSE("GPL");
  252. MODULE_DEVICE_TABLE(pci, sc1200);
  253. MODULE_VERSION(DRV_VERSION);
  254. module_init(sc1200_init);
  255. module_exit(sc1200_exit);