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- /*
- * generic mmc spi driver
- *
- * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
- * Copyright 2019 Bhargav Shah <bhargavshah1988@gmail.com>
- *
- * Licensed under the GPL-2 or later.
- */
- #include <common.h>
- #include <errno.h>
- #include <log.h>
- #include <malloc.h>
- #include <part.h>
- #include <mmc.h>
- #include <stdlib.h>
- #include <linux/bitops.h>
- #include <u-boot/crc.h>
- #include <linux/crc7.h>
- #include <asm/byteorder.h>
- #include <dm.h>
- #include <spi.h>
- /* MMC/SD in SPI mode reports R1 status always */
- #define R1_SPI_IDLE BIT(0)
- #define R1_SPI_ERASE_RESET BIT(1)
- #define R1_SPI_ILLEGAL_COMMAND BIT(2)
- #define R1_SPI_COM_CRC BIT(3)
- #define R1_SPI_ERASE_SEQ BIT(4)
- #define R1_SPI_ADDRESS BIT(5)
- #define R1_SPI_PARAMETER BIT(6)
- /* R1 bit 7 is always zero, reuse this bit for error */
- #define R1_SPI_ERROR BIT(7)
- /* Response tokens used to ack each block written: */
- #define SPI_MMC_RESPONSE_CODE(x) ((x) & 0x1f)
- #define SPI_RESPONSE_ACCEPTED ((2 << 1)|1)
- #define SPI_RESPONSE_CRC_ERR ((5 << 1)|1)
- #define SPI_RESPONSE_WRITE_ERR ((6 << 1)|1)
- /* Read and write blocks start with these tokens and end with crc;
- * on error, read tokens act like a subset of R2_SPI_* values.
- */
- /* single block write multiblock read */
- #define SPI_TOKEN_SINGLE 0xfe
- /* multiblock write */
- #define SPI_TOKEN_MULTI_WRITE 0xfc
- /* terminate multiblock write */
- #define SPI_TOKEN_STOP_TRAN 0xfd
- /* MMC SPI commands start with a start bit "0" and a transmit bit "1" */
- #define MMC_SPI_CMD(x) (0x40 | (x))
- /* bus capability */
- #define MMC_SPI_VOLTAGE (MMC_VDD_32_33 | MMC_VDD_33_34)
- #define MMC_SPI_MIN_CLOCK 400000 /* 400KHz to meet MMC spec */
- #define MMC_SPI_MAX_CLOCK 25000000 /* SD/MMC legacy speed */
- /* timeout value */
- #define CMD_TIMEOUT 8
- #define READ_TIMEOUT 3000000 /* 1 sec */
- #define WRITE_TIMEOUT 3000000 /* 1 sec */
- #define R1B_TIMEOUT 3000000 /* 1 sec */
- struct mmc_spi_plat {
- struct mmc_config cfg;
- struct mmc mmc;
- };
- struct mmc_spi_priv {
- struct spi_slave *spi;
- };
- static int mmc_spi_sendcmd(struct udevice *dev,
- ushort cmdidx, u32 cmdarg, u32 resp_type,
- u8 *resp, u32 resp_size,
- bool resp_match, u8 resp_match_value, bool r1b)
- {
- int i, rpos = 0, ret = 0;
- u8 cmdo[7], r;
- debug("%s: cmd%d cmdarg=0x%x resp_type=0x%x "
- "resp_size=%d resp_match=%d resp_match_value=0x%x\n",
- __func__, cmdidx, cmdarg, resp_type,
- resp_size, resp_match, resp_match_value);
- cmdo[0] = 0xff;
- cmdo[1] = MMC_SPI_CMD(cmdidx);
- cmdo[2] = cmdarg >> 24;
- cmdo[3] = cmdarg >> 16;
- cmdo[4] = cmdarg >> 8;
- cmdo[5] = cmdarg;
- cmdo[6] = (crc7(0, &cmdo[1], 5) << 1) | 0x01;
- ret = dm_spi_xfer(dev, sizeof(cmdo) * 8, cmdo, NULL, SPI_XFER_BEGIN);
- if (ret)
- return ret;
- ret = dm_spi_xfer(dev, 1 * 8, NULL, &r, 0);
- if (ret)
- return ret;
- if (!resp || !resp_size)
- return 0;
- debug("%s: cmd%d", __func__, cmdidx);
- if (resp_match) {
- r = ~resp_match_value;
- i = CMD_TIMEOUT;
- while (i) {
- ret = dm_spi_xfer(dev, 1 * 8, NULL, &r, 0);
- if (ret)
- return ret;
- debug(" resp%d=0x%x", rpos, r);
- rpos++;
- i--;
- if (r == resp_match_value)
- break;
- }
- if (!i && (r != resp_match_value))
- return -ETIMEDOUT;
- }
- for (i = 0; i < resp_size; i++) {
- if (i == 0 && resp_match) {
- resp[i] = resp_match_value;
- continue;
- }
- ret = dm_spi_xfer(dev, 1 * 8, NULL, &r, 0);
- if (ret)
- return ret;
- debug(" resp%d=0x%x", rpos, r);
- rpos++;
- resp[i] = r;
- }
- if (r1b == true) {
- i = R1B_TIMEOUT;
- while (i) {
- ret = dm_spi_xfer(dev, 1 * 8, NULL, &r, 0);
- if (ret)
- return ret;
- debug(" resp%d=0x%x", rpos, r);
- rpos++;
- i--;
- if (r)
- break;
- }
- if (!i)
- return -ETIMEDOUT;
- }
- debug("\n");
- return 0;
- }
- static int mmc_spi_readdata(struct udevice *dev,
- void *xbuf, u32 bcnt, u32 bsize)
- {
- u16 crc;
- u8 *buf = xbuf, r1;
- int i, ret = 0;
- while (bcnt--) {
- for (i = 0; i < READ_TIMEOUT; i++) {
- ret = dm_spi_xfer(dev, 1 * 8, NULL, &r1, 0);
- if (ret)
- return ret;
- if (r1 == SPI_TOKEN_SINGLE)
- break;
- }
- debug("%s: data tok%d 0x%x\n", __func__, i, r1);
- if (r1 == SPI_TOKEN_SINGLE) {
- ret = dm_spi_xfer(dev, bsize * 8, NULL, buf, 0);
- if (ret)
- return ret;
- ret = dm_spi_xfer(dev, 2 * 8, NULL, &crc, 0);
- if (ret)
- return ret;
- #ifdef CONFIG_MMC_SPI_CRC_ON
- if (be16_to_cpu(crc16_ccitt(0, buf, bsize)) != crc) {
- debug("%s: data crc error\n", __func__);
- r1 = R1_SPI_COM_CRC;
- break;
- }
- #endif
- r1 = 0;
- } else {
- r1 = R1_SPI_ERROR;
- break;
- }
- buf += bsize;
- }
- if (r1 & R1_SPI_COM_CRC)
- ret = -ECOMM;
- else if (r1) /* other errors */
- ret = -ETIMEDOUT;
- return ret;
- }
- static int mmc_spi_writedata(struct udevice *dev, const void *xbuf,
- u32 bcnt, u32 bsize, int multi)
- {
- const u8 *buf = xbuf;
- u8 r1, tok[2];
- u16 crc;
- int i, ret = 0;
- tok[0] = 0xff;
- tok[1] = multi ? SPI_TOKEN_MULTI_WRITE : SPI_TOKEN_SINGLE;
- while (bcnt--) {
- #ifdef CONFIG_MMC_SPI_CRC_ON
- crc = cpu_to_be16(crc16_ccitt(0, (u8 *)buf, bsize));
- #endif
- dm_spi_xfer(dev, 2 * 8, tok, NULL, 0);
- dm_spi_xfer(dev, bsize * 8, buf, NULL, 0);
- dm_spi_xfer(dev, 2 * 8, &crc, NULL, 0);
- for (i = 0; i < CMD_TIMEOUT; i++) {
- dm_spi_xfer(dev, 1 * 8, NULL, &r1, 0);
- if ((r1 & 0x10) == 0) /* response token */
- break;
- }
- debug("%s: data tok%d 0x%x\n", __func__, i, r1);
- if (SPI_MMC_RESPONSE_CODE(r1) == SPI_RESPONSE_ACCEPTED) {
- debug("%s: data accepted\n", __func__);
- for (i = 0; i < WRITE_TIMEOUT; i++) { /* wait busy */
- dm_spi_xfer(dev, 1 * 8, NULL, &r1, 0);
- if (i && r1 == 0xff) {
- r1 = 0;
- break;
- }
- }
- if (i == WRITE_TIMEOUT) {
- debug("%s: data write timeout 0x%x\n",
- __func__, r1);
- r1 = R1_SPI_ERROR;
- break;
- }
- } else {
- debug("%s: data error 0x%x\n", __func__, r1);
- r1 = R1_SPI_COM_CRC;
- break;
- }
- buf += bsize;
- }
- if (multi && bcnt == -1) { /* stop multi write */
- tok[1] = SPI_TOKEN_STOP_TRAN;
- dm_spi_xfer(dev, 2 * 8, tok, NULL, 0);
- for (i = 0; i < WRITE_TIMEOUT; i++) { /* wait busy */
- dm_spi_xfer(dev, 1 * 8, NULL, &r1, 0);
- if (i && r1 == 0xff) {
- r1 = 0;
- break;
- }
- }
- if (i == WRITE_TIMEOUT) {
- debug("%s: data write timeout 0x%x\n", __func__, r1);
- r1 = R1_SPI_ERROR;
- }
- }
- if (r1 & R1_SPI_COM_CRC)
- ret = -ECOMM;
- else if (r1) /* other errors */
- ret = -ETIMEDOUT;
- return ret;
- }
- static int dm_mmc_spi_set_ios(struct udevice *dev)
- {
- return 0;
- }
- static int dm_mmc_spi_request(struct udevice *dev, struct mmc_cmd *cmd,
- struct mmc_data *data)
- {
- int i, multi, ret = 0;
- u8 *resp = NULL;
- u32 resp_size = 0;
- bool resp_match = false, r1b = false;
- u8 resp8 = 0, resp16[2] = { 0 }, resp40[5] = { 0 }, resp_match_value = 0;
- dm_spi_claim_bus(dev);
- for (i = 0; i < 4; i++)
- cmd->response[i] = 0;
- switch (cmd->cmdidx) {
- case SD_CMD_APP_SEND_OP_COND:
- case MMC_CMD_SEND_OP_COND:
- resp = &resp8;
- resp_size = sizeof(resp8);
- cmd->cmdarg = 0x40000000;
- break;
- case SD_CMD_SEND_IF_COND:
- resp = (u8 *)&resp40[0];
- resp_size = sizeof(resp40);
- resp_match = true;
- resp_match_value = R1_SPI_IDLE;
- break;
- case MMC_CMD_SPI_READ_OCR:
- resp = (u8 *)&resp40[0];
- resp_size = sizeof(resp40);
- break;
- case MMC_CMD_SEND_STATUS:
- resp = (u8 *)&resp16[0];
- resp_size = sizeof(resp16);
- break;
- case MMC_CMD_SET_BLOCKLEN:
- case MMC_CMD_SPI_CRC_ON_OFF:
- resp = &resp8;
- resp_size = sizeof(resp8);
- resp_match = true;
- resp_match_value = 0x0;
- break;
- case MMC_CMD_STOP_TRANSMISSION:
- case MMC_CMD_ERASE:
- resp = &resp8;
- resp_size = sizeof(resp8);
- r1b = true;
- break;
- case MMC_CMD_SEND_CSD:
- case MMC_CMD_SEND_CID:
- case MMC_CMD_READ_SINGLE_BLOCK:
- case MMC_CMD_READ_MULTIPLE_BLOCK:
- case MMC_CMD_WRITE_SINGLE_BLOCK:
- case MMC_CMD_WRITE_MULTIPLE_BLOCK:
- case MMC_CMD_APP_CMD:
- case SD_CMD_ERASE_WR_BLK_START:
- case SD_CMD_ERASE_WR_BLK_END:
- resp = &resp8;
- resp_size = sizeof(resp8);
- break;
- default:
- resp = &resp8;
- resp_size = sizeof(resp8);
- resp_match = true;
- resp_match_value = R1_SPI_IDLE;
- break;
- };
- ret = mmc_spi_sendcmd(dev, cmd->cmdidx, cmd->cmdarg, cmd->resp_type,
- resp, resp_size, resp_match, resp_match_value, r1b);
- if (ret)
- goto done;
- switch (cmd->cmdidx) {
- case SD_CMD_APP_SEND_OP_COND:
- case MMC_CMD_SEND_OP_COND:
- cmd->response[0] = (resp8 & R1_SPI_IDLE) ? 0 : OCR_BUSY;
- break;
- case SD_CMD_SEND_IF_COND:
- case MMC_CMD_SPI_READ_OCR:
- cmd->response[0] = resp40[4];
- cmd->response[0] |= (uint)resp40[3] << 8;
- cmd->response[0] |= (uint)resp40[2] << 16;
- cmd->response[0] |= (uint)resp40[1] << 24;
- break;
- case MMC_CMD_SEND_STATUS:
- if (resp16[0] || resp16[1])
- cmd->response[0] = MMC_STATUS_ERROR;
- else
- cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
- break;
- case MMC_CMD_SEND_CID:
- case MMC_CMD_SEND_CSD:
- ret = mmc_spi_readdata(dev, cmd->response, 1, 16);
- if (ret)
- return ret;
- for (i = 0; i < 4; i++)
- cmd->response[i] =
- cpu_to_be32(cmd->response[i]);
- break;
- default:
- cmd->response[0] = resp8;
- break;
- }
- debug("%s: cmd%d resp0=0x%x resp1=0x%x resp2=0x%x resp3=0x%x\n",
- __func__, cmd->cmdidx, cmd->response[0], cmd->response[1],
- cmd->response[2], cmd->response[3]);
- if (data) {
- debug("%s: data flags=0x%x blocks=%d block_size=%d\n",
- __func__, data->flags, data->blocks, data->blocksize);
- multi = (cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK);
- if (data->flags == MMC_DATA_READ)
- ret = mmc_spi_readdata(dev, data->dest,
- data->blocks, data->blocksize);
- else if (data->flags == MMC_DATA_WRITE)
- ret = mmc_spi_writedata(dev, data->src,
- data->blocks, data->blocksize,
- multi);
- }
- done:
- dm_spi_xfer(dev, 0, NULL, NULL, SPI_XFER_END);
- dm_spi_release_bus(dev);
- return ret;
- }
- static int mmc_spi_probe(struct udevice *dev)
- {
- struct mmc_spi_priv *priv = dev_get_priv(dev);
- struct mmc_spi_plat *plat = dev_get_platdata(dev);
- struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
- char *name;
- priv->spi = dev_get_parent_priv(dev);
- if (!priv->spi->max_hz)
- priv->spi->max_hz = MMC_SPI_MAX_CLOCK;
- priv->spi->speed = 0;
- priv->spi->mode = SPI_MODE_0;
- priv->spi->wordlen = 8;
- name = malloc(strlen(dev->parent->name) + strlen(dev->name) + 4);
- if (!name)
- return -ENOMEM;
- sprintf(name, "%s:%s", dev->parent->name, dev->name);
- plat->cfg.name = name;
- plat->cfg.host_caps = MMC_MODE_SPI;
- plat->cfg.voltages = MMC_SPI_VOLTAGE;
- plat->cfg.f_min = MMC_SPI_MIN_CLOCK;
- plat->cfg.f_max = priv->spi->max_hz;
- plat->cfg.part_type = PART_TYPE_DOS;
- plat->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
- plat->mmc.cfg = &plat->cfg;
- plat->mmc.priv = priv;
- plat->mmc.dev = dev;
- upriv->mmc = &plat->mmc;
- return 0;
- }
- static int mmc_spi_bind(struct udevice *dev)
- {
- struct mmc_spi_plat *plat = dev_get_platdata(dev);
- return mmc_bind(dev, &plat->mmc, &plat->cfg);
- }
- static const struct dm_mmc_ops mmc_spi_ops = {
- .send_cmd = dm_mmc_spi_request,
- .set_ios = dm_mmc_spi_set_ios,
- };
- static const struct udevice_id dm_mmc_spi_match[] = {
- { .compatible = "mmc-spi-slot" },
- { /* sentinel */ }
- };
- U_BOOT_DRIVER(mmc_spi) = {
- .name = "mmc_spi",
- .id = UCLASS_MMC,
- .of_match = dm_mmc_spi_match,
- .ops = &mmc_spi_ops,
- .probe = mmc_spi_probe,
- .bind = mmc_spi_bind,
- .platdata_auto_alloc_size = sizeof(struct mmc_spi_plat),
- .priv_auto_alloc_size = sizeof(struct mmc_spi_priv),
- };
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