diff options
Diffstat (limited to 'drivers/mmc/atmel_mci.c')
| -rw-r--r-- | drivers/mmc/atmel_mci.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/drivers/mmc/atmel_mci.c b/drivers/mmc/atmel_mci.c new file mode 100644 index 000000000..61aa1849c --- /dev/null +++ b/drivers/mmc/atmel_mci.c @@ -0,0 +1,548 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#include <common.h> + +#include <part.h> +#include <mmc.h> + +#include <asm/io.h> +#include <asm/errno.h> +#include <asm/byteorder.h> +#include <asm/arch/clk.h> +#include <asm/arch/memory-map.h> + +#include "atmel_mci.h" + +#ifdef DEBUG +#define pr_debug(fmt, args...) printf(fmt, ##args) +#else +#define pr_debug(...) do { } while(0) +#endif + +#ifndef CFG_MMC_CLK_OD +#define CFG_MMC_CLK_OD 150000 +#endif + +#ifndef CFG_MMC_CLK_PP +#define CFG_MMC_CLK_PP 5000000 +#endif + +#ifndef CFG_MMC_OP_COND +#define CFG_MMC_OP_COND 0x00100000 +#endif + +#define MMC_DEFAULT_BLKLEN 512 +#define MMC_DEFAULT_RCA 1 + +static unsigned int mmc_rca; +static int mmc_card_is_sd; +static block_dev_desc_t mmc_blkdev; + +block_dev_desc_t *mmc_get_dev(int dev) +{ + return &mmc_blkdev; +} + +static void mci_set_mode(unsigned long hz, unsigned long blklen) +{ + unsigned long bus_hz; + unsigned long clkdiv; + + bus_hz = get_mci_clk_rate(); + clkdiv = (bus_hz / hz) / 2 - 1; + + pr_debug("mmc: setting clock %lu Hz, block size %lu\n", + hz, blklen); + + if (clkdiv & ~255UL) { + clkdiv = 255; + printf("mmc: clock %lu too low; setting CLKDIV to 255\n", + hz); + } + + blklen &= 0xfffc; + mmci_writel(MR, (MMCI_BF(CLKDIV, clkdiv) + | MMCI_BF(BLKLEN, blklen) + | MMCI_BIT(RDPROOF) + | MMCI_BIT(WRPROOF))); +} + +#define RESP_NO_CRC 1 +#define R1 MMCI_BF(RSPTYP, 1) +#define R2 MMCI_BF(RSPTYP, 2) +#define R3 (R1 | RESP_NO_CRC) +#define R6 R1 +#define NID MMCI_BF(MAXLAT, 0) +#define NCR MMCI_BF(MAXLAT, 1) +#define TRCMD_START MMCI_BF(TRCMD, 1) +#define TRDIR_READ MMCI_BF(TRDIR, 1) +#define TRTYP_BLOCK MMCI_BF(TRTYP, 0) +#define INIT_CMD MMCI_BF(SPCMD, 1) +#define OPEN_DRAIN MMCI_BF(OPDCMD, 1) + +#define ERROR_FLAGS (MMCI_BIT(DTOE) \ + | MMCI_BIT(RDIRE) \ + | MMCI_BIT(RENDE) \ + | MMCI_BIT(RINDE) \ + | MMCI_BIT(RTOE)) + +static int +mmc_cmd(unsigned long cmd, unsigned long arg, + void *resp, unsigned long flags) +{ + unsigned long *response = resp; + int i, response_words = 0; + unsigned long error_flags; + u32 status; + + pr_debug("mmc: CMD%lu 0x%lx (flags 0x%lx)\n", + cmd, arg, flags); + + error_flags = ERROR_FLAGS; + if (!(flags & RESP_NO_CRC)) + error_flags |= MMCI_BIT(RCRCE); + + flags &= ~MMCI_BF(CMDNB, ~0UL); + + if (MMCI_BFEXT(RSPTYP, flags) == MMCI_RSPTYP_48_BIT_RESP) + response_words = 1; + else if (MMCI_BFEXT(RSPTYP, flags) == MMCI_RSPTYP_136_BIT_RESP) + response_words = 4; + + mmci_writel(ARGR, arg); + mmci_writel(CMDR, cmd | flags); + do { + udelay(40); + status = mmci_readl(SR); + } while (!(status & MMCI_BIT(CMDRDY))); + + pr_debug("mmc: status 0x%08lx\n", status); + + if (status & error_flags) { + printf("mmc: command %lu failed (status: 0x%08lx)\n", + cmd, status); + return -EIO; + } + + if (response_words) + pr_debug("mmc: response:"); + + for (i = 0; i < response_words; i++) { + response[i] = mmci_readl(RSPR); + pr_debug(" %08lx", response[i]); + } + pr_debug("\n"); + + return 0; +} + +static int mmc_acmd(unsigned long cmd, unsigned long arg, + void *resp, unsigned long flags) +{ + unsigned long aresp[4]; + int ret; + + /* + * Seems like the APP_CMD part of an ACMD has 64 cycles max + * latency even though the ACMD part doesn't. This isn't + * entirely clear in the SD Card spec, but some cards refuse + * to work if we attempt to use 5 cycles max latency here... + */ + ret = mmc_cmd(MMC_CMD_APP_CMD, 0, aresp, + R1 | NCR | (flags & OPEN_DRAIN)); + if (ret) + return ret; + if ((aresp[0] & (R1_ILLEGAL_COMMAND | R1_APP_CMD)) != R1_APP_CMD) + return -ENODEV; + + ret = mmc_cmd(cmd, arg, resp, flags); + return ret; +} + +static unsigned long +mmc_bread(int dev, unsigned long start, lbaint_t blkcnt, + void *buffer) +{ + int ret, i = 0; + unsigned long resp[4]; + unsigned long card_status, data; + unsigned long wordcount; + u32 *p = buffer; + u32 status; + + if (blkcnt == 0) + return 0; + + pr_debug("mmc_bread: dev %d, start %lx, blkcnt %lx\n", + dev, start, blkcnt); + + /* Put the device into Transfer state */ + ret = mmc_cmd(MMC_CMD_SELECT_CARD, mmc_rca << 16, resp, R1 | NCR); + if (ret) goto out; + + /* Set block length */ + ret = mmc_cmd(MMC_CMD_SET_BLOCKLEN, mmc_blkdev.blksz, resp, R1 | NCR); + if (ret) goto out; + + pr_debug("MCI_DTOR = %08lx\n", mmci_readl(DTOR)); + + for (i = 0; i < blkcnt; i++, start++) { + ret = mmc_cmd(MMC_CMD_READ_SINGLE_BLOCK, + start * mmc_blkdev.blksz, resp, + (R1 | NCR | TRCMD_START | TRDIR_READ + | TRTYP_BLOCK)); + if (ret) goto out; + + ret = -EIO; + wordcount = 0; + do { + do { + status = mmci_readl(SR); + if (status & (ERROR_FLAGS | MMCI_BIT(OVRE))) + goto read_error; + } while (!(status & MMCI_BIT(RXRDY))); + + if (status & MMCI_BIT(RXRDY)) { + data = mmci_readl(RDR); + /* pr_debug("%x\n", data); */ + *p++ = data; + wordcount++; + } + } while(wordcount < (mmc_blkdev.blksz / 4)); + + pr_debug("mmc: read %u words, waiting for BLKE\n", wordcount); + + do { + status = mmci_readl(SR); + } while (!(status & MMCI_BIT(BLKE))); + + putc('.'); + } + +out: + /* Put the device back into Standby state */ + mmc_cmd(MMC_CMD_SELECT_CARD, 0, resp, NCR); + return i; + +read_error: + mmc_cmd(MMC_CMD_SEND_STATUS, mmc_rca << 16, &card_status, R1 | NCR); + printf("mmc: bread failed, status = %08x, card status = %08x\n", + status, card_status); + goto out; +} + +static void mmc_parse_cid(struct mmc_cid *cid, unsigned long *resp) +{ + cid->mid = resp[0] >> 24; + cid->oid = (resp[0] >> 8) & 0xffff; + cid->pnm[0] = resp[0]; + cid->pnm[1] = resp[1] >> 24; + cid->pnm[2] = resp[1] >> 16; + cid->pnm[3] = resp[1] >> 8; + cid->pnm[4] = resp[1]; + cid->pnm[5] = resp[2] >> 24; + cid->pnm[6] = 0; + cid->prv = resp[2] >> 16; + cid->psn = (resp[2] << 16) | (resp[3] >> 16); + cid->mdt = resp[3] >> 8; +} + +static void sd_parse_cid(struct mmc_cid *cid, unsigned long *resp) +{ + cid->mid = resp[0] >> 24; + cid->oid = (resp[0] >> 8) & 0xffff; + cid->pnm[0] = resp[0]; + cid->pnm[1] = resp[1] >> 24; + cid->pnm[2] = resp[1] >> 16; + cid->pnm[3] = resp[1] >> 8; + cid->pnm[4] = resp[1]; + cid->pnm[5] = 0; + cid->pnm[6] = 0; + cid->prv = resp[2] >> 24; + cid->psn = (resp[2] << 8) | (resp[3] >> 24); + cid->mdt = (resp[3] >> 8) & 0x0fff; +} + +static void mmc_dump_cid(const struct mmc_cid *cid) +{ + printf("Manufacturer ID: %02lX\n", cid->mid); + printf("OEM/Application ID: %04lX\n", cid->oid); + printf("Product name: %s\n", cid->pnm); + printf("Product Revision: %lu.%lu\n", + cid->prv >> 4, cid->prv & 0x0f); + printf("Product Serial Number: %lu\n", cid->psn); + printf("Manufacturing Date: %02lu/%02lu\n", + cid->mdt >> 4, cid->mdt & 0x0f); +} + +static void mmc_dump_csd(const struct mmc_csd *csd) +{ + unsigned long *csd_raw = (unsigned long *)csd; + printf("CSD data: %08lx %08lx %08lx %08lx\n", + csd_raw[0], csd_raw[1], csd_raw[2], csd_raw[3]); + printf("CSD structure version: 1.%u\n", csd->csd_structure); + printf("MMC System Spec version: %u\n", csd->spec_vers); + printf("Card command classes: %03x\n", csd->ccc); + printf("Read block length: %u\n", 1 << csd->read_bl_len); + if (csd->read_bl_partial) + puts("Supports partial reads\n"); + else + puts("Does not support partial reads\n"); + printf("Write block length: %u\n", 1 << csd->write_bl_len); + if (csd->write_bl_partial) + puts("Supports partial writes\n"); + else + puts("Does not support partial writes\n"); + if (csd->wp_grp_enable) + printf("Supports group WP: %u\n", csd->wp_grp_size + 1); + else + puts("Does not support group WP\n"); + printf("Card capacity: %u bytes\n", + (csd->c_size + 1) * (1 << (csd->c_size_mult + 2)) * + (1 << csd->read_bl_len)); + printf("File format: %u/%u\n", + csd->file_format_grp, csd->file_format); + puts("Write protection: "); + if (csd->perm_write_protect) + puts(" permanent"); + if (csd->tmp_write_protect) + puts(" temporary"); + putc('\n'); +} + +static int mmc_idle_cards(void) +{ + int ret; + + /* Reset and initialize all cards */ + ret = mmc_cmd(MMC_CMD_GO_IDLE_STATE, 0, NULL, 0); + if (ret) + return ret; + + /* Keep the bus idle for 74 clock cycles */ + return mmc_cmd(0, 0, NULL, INIT_CMD); +} + +static int sd_init_card(struct mmc_cid *cid, int verbose) +{ + unsigned long resp[4]; + int i, ret = 0; + + mmc_idle_cards(); + for (i = 0; i < 1000; i++) { + ret = mmc_acmd(SD_CMD_APP_SEND_OP_COND, CFG_MMC_OP_COND, + resp, R3 | NID); + if (ret || (resp[0] & 0x80000000)) + break; + ret = -ETIMEDOUT; + } + + if (ret) + return ret; + + ret = mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, resp, R2 | NID); + if (ret) + return ret; + sd_parse_cid(cid, resp); + if (verbose) + mmc_dump_cid(cid); + + /* Get RCA of the card that responded */ + ret = mmc_cmd(SD_CMD_SEND_RELATIVE_ADDR, 0, resp, R6 | NCR); + if (ret) + return ret; + + mmc_rca = resp[0] >> 16; + if (verbose) + printf("SD Card detected (RCA %u)\n", mmc_rca); + mmc_card_is_sd = 1; + return 0; +} + +static int mmc_init_card(struct mmc_cid *cid, int verbose) +{ + unsigned long resp[4]; + int i, ret = 0; + + mmc_idle_cards(); + for (i = 0; i < 1000; i++) { + ret = mmc_cmd(MMC_CMD_SEND_OP_COND, CFG_MMC_OP_COND, resp, + R3 | NID | OPEN_DRAIN); + if (ret || (resp[0] & 0x80000000)) + break; + ret = -ETIMEDOUT; + } + + if (ret) + return ret; + + /* Get CID of all cards. FIXME: Support more than one card */ + ret = mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, resp, R2 | NID | OPEN_DRAIN); + if (ret) + return ret; + mmc_parse_cid(cid, resp); + if (verbose) + mmc_dump_cid(cid); + + /* Set Relative Address of the card that responded */ + ret = mmc_cmd(MMC_CMD_SET_RELATIVE_ADDR, mmc_rca << 16, resp, + R1 | NCR | OPEN_DRAIN); + return ret; +} + +static void mci_set_data_timeout(struct mmc_csd *csd) +{ + static const unsigned int dtomul_to_shift[] = { + 0, 4, 7, 8, 10, 12, 16, 20, + }; + static const unsigned int taac_exp[] = { + 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, + }; + static const unsigned int taac_mant[] = { + 0, 10, 12, 13, 15, 60, 25, 30, + 35, 40, 45, 50, 55, 60, 70, 80, + }; + unsigned int timeout_ns, timeout_clks; + unsigned int e, m; + unsigned int dtocyc, dtomul; + unsigned int shift; + u32 dtor; + + e = csd->taac & 0x07; + m = (csd->taac >> 3) & 0x0f; + + timeout_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; + timeout_clks = csd->nsac * 100; + + timeout_clks += (((timeout_ns + 9) / 10) + * ((CFG_MMC_CLK_PP + 99999) / 100000) + 9999) / 10000; + if (!mmc_card_is_sd) + timeout_clks *= 10; + else + timeout_clks *= 100; + + dtocyc = timeout_clks; + dtomul = 0; + shift = 0; + while (dtocyc > 15 && dtomul < 8) { + dtomul++; + shift = dtomul_to_shift[dtomul]; + dtocyc = (timeout_clks + (1 << shift) - 1) >> shift; + } + + if (dtomul >= 8) { + dtomul = 7; + dtocyc = 15; + puts("Warning: Using maximum data timeout\n"); + } + + dtor = (MMCI_BF(DTOMUL, dtomul) + | MMCI_BF(DTOCYC, dtocyc)); + mmci_writel(DTOR, dtor); + + printf("mmc: Using %u cycles data timeout (DTOR=0x%x)\n", + dtocyc << shift, dtor); +} + +int mmc_init(int verbose) +{ + struct mmc_cid cid; + struct mmc_csd csd; + unsigned int max_blksz; + int ret; + + /* Initialize controller */ + mmci_writel(CR, MMCI_BIT(SWRST)); + mmci_writel(CR, MMCI_BIT(MCIEN)); + mmci_writel(DTOR, 0x5f); + mmci_writel(IDR, ~0UL); + mci_set_mode(CFG_MMC_CLK_OD, MMC_DEFAULT_BLKLEN); + + mmc_card_is_sd = 0; + + ret = sd_init_card(&cid, verbose); + if (ret) { + mmc_rca = MMC_DEFAULT_RCA; + ret = mmc_init_card(&cid, verbose); + } + if (ret) + return ret; + + /* Get CSD from the card */ + ret = mmc_cmd(MMC_CMD_SEND_CSD, mmc_rca << 16, &csd, R2 | NCR); + if (ret) + return ret; + if (verbose) + mmc_dump_csd(&csd); + + mci_set_data_timeout(&csd); + + /* Initialize the blockdev structure */ + mmc_blkdev.if_type = IF_TYPE_MMC; + mmc_blkdev.part_type = PART_TYPE_DOS; + mmc_blkdev.block_read = mmc_bread; + sprintf((char *)mmc_blkdev.vendor, + "Man %02x%04x Snr %08x", + cid.mid, cid.oid, cid.psn); + strncpy((char *)mmc_blkdev.product, cid.pnm, + sizeof(mmc_blkdev.product)); + sprintf((char *)mmc_blkdev.revision, "%x %x", + cid.prv >> 4, cid.prv & 0x0f); + + /* + * If we can't use 512 byte blocks, refuse to deal with the + * card. Tons of code elsewhere seems to depend on this. + */ + max_blksz = 1 << csd.read_bl_len; + if (max_blksz < 512 || (max_blksz > 512 && !csd.read_bl_partial)) { + printf("Card does not support 512 byte reads, aborting.\n"); + return -ENODEV; + } + mmc_blkdev.blksz = 512; + mmc_blkdev.lba = (csd.c_size + 1) * (1 << (csd.c_size_mult + 2)); + + mci_set_mode(CFG_MMC_CLK_PP, mmc_blkdev.blksz); + +#if 0 + if (fat_register_device(&mmc_blkdev, 1)) + printf("Could not register MMC fat device\n"); +#else + init_part(&mmc_blkdev); +#endif + + return 0; +} + +int mmc_read(ulong src, uchar *dst, int size) +{ + return -ENOSYS; +} + +int mmc_write(uchar *src, ulong dst, int size) +{ + return -ENOSYS; +} + +int mmc2info(ulong addr) +{ + return 0; +} |