| /* |
| * linux/drivers/mmc/core/sd.c |
| * |
| * Copyright (C) 2003-2004 Russell King, All Rights Reserved. |
| * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
| * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/err.h> |
| |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/card.h> |
| #include <linux/mmc/mmc.h> |
| #include <linux/mmc/sd.h> |
| |
| #include "core.h" |
| #include "sysfs.h" |
| #include "bus.h" |
| #include "mmc_ops.h" |
| #include "sd_ops.h" |
| |
| static const unsigned int tran_exp[] = { |
| 10000, 100000, 1000000, 10000000, |
| 0, 0, 0, 0 |
| }; |
| |
| static const unsigned char tran_mant[] = { |
| 0, 10, 12, 13, 15, 20, 25, 30, |
| 35, 40, 45, 50, 55, 60, 70, 80, |
| }; |
| |
| static const unsigned int tacc_exp[] = { |
| 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, |
| }; |
| |
| static const unsigned int tacc_mant[] = { |
| 0, 10, 12, 13, 15, 20, 25, 30, |
| 35, 40, 45, 50, 55, 60, 70, 80, |
| }; |
| |
| #define UNSTUFF_BITS(resp,start,size) \ |
| ({ \ |
| const int __size = size; \ |
| const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ |
| const int __off = 3 - ((start) / 32); \ |
| const int __shft = (start) & 31; \ |
| u32 __res; \ |
| \ |
| __res = resp[__off] >> __shft; \ |
| if (__size + __shft > 32) \ |
| __res |= resp[__off-1] << ((32 - __shft) % 32); \ |
| __res & __mask; \ |
| }) |
| |
| /* |
| * Given the decoded CSD structure, decode the raw CID to our CID structure. |
| */ |
| static void mmc_decode_cid(struct mmc_card *card) |
| { |
| u32 *resp = card->raw_cid; |
| |
| memset(&card->cid, 0, sizeof(struct mmc_cid)); |
| |
| /* |
| * SD doesn't currently have a version field so we will |
| * have to assume we can parse this. |
| */ |
| card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
| card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); |
| card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); |
| card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); |
| card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); |
| card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); |
| card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); |
| card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); |
| card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); |
| card->cid.serial = UNSTUFF_BITS(resp, 24, 32); |
| card->cid.year = UNSTUFF_BITS(resp, 12, 8); |
| card->cid.month = UNSTUFF_BITS(resp, 8, 4); |
| |
| card->cid.year += 2000; /* SD cards year offset */ |
| } |
| |
| /* |
| * Given a 128-bit response, decode to our card CSD structure. |
| */ |
| static int mmc_decode_csd(struct mmc_card *card) |
| { |
| struct mmc_csd *csd = &card->csd; |
| unsigned int e, m, csd_struct; |
| u32 *resp = card->raw_csd; |
| |
| csd_struct = UNSTUFF_BITS(resp, 126, 2); |
| |
| switch (csd_struct) { |
| case 0: |
| m = UNSTUFF_BITS(resp, 115, 4); |
| e = UNSTUFF_BITS(resp, 112, 3); |
| csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; |
| csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; |
| |
| m = UNSTUFF_BITS(resp, 99, 4); |
| e = UNSTUFF_BITS(resp, 96, 3); |
| csd->max_dtr = tran_exp[e] * tran_mant[m]; |
| csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); |
| |
| e = UNSTUFF_BITS(resp, 47, 3); |
| m = UNSTUFF_BITS(resp, 62, 12); |
| csd->capacity = (1 + m) << (e + 2); |
| |
| csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
| csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
| csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); |
| csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); |
| csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
| csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
| csd->write_partial = UNSTUFF_BITS(resp, 21, 1); |
| break; |
| case 1: |
| /* |
| * This is a block-addressed SDHC card. Most |
| * interesting fields are unused and have fixed |
| * values. To avoid getting tripped by buggy cards, |
| * we assume those fixed values ourselves. |
| */ |
| mmc_card_set_blockaddr(card); |
| |
| csd->tacc_ns = 0; /* Unused */ |
| csd->tacc_clks = 0; /* Unused */ |
| |
| m = UNSTUFF_BITS(resp, 99, 4); |
| e = UNSTUFF_BITS(resp, 96, 3); |
| csd->max_dtr = tran_exp[e] * tran_mant[m]; |
| csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); |
| |
| m = UNSTUFF_BITS(resp, 48, 22); |
| csd->capacity = (1 + m) << 10; |
| |
| csd->read_blkbits = 9; |
| csd->read_partial = 0; |
| csd->write_misalign = 0; |
| csd->read_misalign = 0; |
| csd->r2w_factor = 4; /* Unused */ |
| csd->write_blkbits = 9; |
| csd->write_partial = 0; |
| break; |
| default: |
| printk("%s: unrecognised CSD structure version %d\n", |
| mmc_hostname(card->host), csd_struct); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Given a 64-bit response, decode to our card SCR structure. |
| */ |
| static int mmc_decode_scr(struct mmc_card *card) |
| { |
| struct sd_scr *scr = &card->scr; |
| unsigned int scr_struct; |
| u32 resp[4]; |
| |
| BUG_ON(!mmc_card_sd(card)); |
| |
| resp[3] = card->raw_scr[1]; |
| resp[2] = card->raw_scr[0]; |
| |
| scr_struct = UNSTUFF_BITS(resp, 60, 4); |
| if (scr_struct != 0) { |
| printk("%s: unrecognised SCR structure version %d\n", |
| mmc_hostname(card->host), scr_struct); |
| return -EINVAL; |
| } |
| |
| scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); |
| scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); |
| |
| return 0; |
| } |
| |
| /* |
| * Fetches and decodes switch information |
| */ |
| static int mmc_read_switch(struct mmc_card *card) |
| { |
| int err; |
| u8 *status; |
| |
| if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
| return MMC_ERR_NONE; |
| |
| if (!(card->csd.cmdclass & CCC_SWITCH)) { |
| printk(KERN_WARNING "%s: card lacks mandatory switch " |
| "function, performance might suffer.\n", |
| mmc_hostname(card->host)); |
| return MMC_ERR_NONE; |
| } |
| |
| err = MMC_ERR_FAILED; |
| |
| status = kmalloc(64, GFP_KERNEL); |
| if (!status) { |
| printk("%s: could not allocate a buffer for switch " |
| "capabilities.\n", |
| mmc_hostname(card->host)); |
| return err; |
| } |
| |
| err = mmc_sd_switch(card, 0, 0, 1, status); |
| if (err != MMC_ERR_NONE) { |
| printk(KERN_WARNING "%s: problem reading switch " |
| "capabilities, performance might suffer.\n", |
| mmc_hostname(card->host)); |
| err = MMC_ERR_NONE; |
| goto out; |
| } |
| |
| if (status[13] & 0x02) |
| card->sw_caps.hs_max_dtr = 50000000; |
| |
| out: |
| kfree(status); |
| |
| return err; |
| } |
| |
| /* |
| * Test if the card supports high-speed mode and, if so, switch to it. |
| */ |
| static int mmc_switch_hs(struct mmc_card *card) |
| { |
| int err; |
| u8 *status; |
| |
| if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
| return MMC_ERR_NONE; |
| |
| if (!(card->csd.cmdclass & CCC_SWITCH)) |
| return MMC_ERR_NONE; |
| |
| if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
| return MMC_ERR_NONE; |
| |
| if (card->sw_caps.hs_max_dtr == 0) |
| return MMC_ERR_NONE; |
| |
| err = MMC_ERR_FAILED; |
| |
| status = kmalloc(64, GFP_KERNEL); |
| if (!status) { |
| printk("%s: could not allocate a buffer for switch " |
| "capabilities.\n", |
| mmc_hostname(card->host)); |
| return err; |
| } |
| |
| err = mmc_sd_switch(card, 1, 0, 1, status); |
| if (err != MMC_ERR_NONE) |
| goto out; |
| |
| if ((status[16] & 0xF) != 1) { |
| printk(KERN_WARNING "%s: Problem switching card " |
| "into high-speed mode!\n", |
| mmc_hostname(card->host)); |
| } else { |
| mmc_card_set_highspeed(card); |
| mmc_set_timing(card->host, MMC_TIMING_SD_HS); |
| } |
| |
| out: |
| kfree(status); |
| |
| return err; |
| } |
| |
| /* |
| * Handle the detection and initialisation of a card. |
| * |
| * In the case of a resume, "curcard" will contain the card |
| * we're trying to reinitialise. |
| */ |
| static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, |
| struct mmc_card *oldcard) |
| { |
| struct mmc_card *card; |
| int err; |
| u32 cid[4]; |
| unsigned int max_dtr; |
| |
| BUG_ON(!host); |
| BUG_ON(!host->claimed); |
| |
| /* |
| * Since we're changing the OCR value, we seem to |
| * need to tell some cards to go back to the idle |
| * state. We wait 1ms to give cards time to |
| * respond. |
| */ |
| mmc_go_idle(host); |
| |
| /* |
| * If SD_SEND_IF_COND indicates an SD 2.0 |
| * compliant card and we should set bit 30 |
| * of the ocr to indicate that we can handle |
| * block-addressed SDHC cards. |
| */ |
| err = mmc_send_if_cond(host, ocr); |
| if (err == MMC_ERR_NONE) |
| ocr |= 1 << 30; |
| |
| err = mmc_send_app_op_cond(host, ocr, NULL); |
| if (err != MMC_ERR_NONE) |
| goto err; |
| |
| /* |
| * Fetch CID from card. |
| */ |
| err = mmc_all_send_cid(host, cid); |
| if (err != MMC_ERR_NONE) |
| goto err; |
| |
| if (oldcard) { |
| if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) |
| goto err; |
| |
| card = oldcard; |
| } else { |
| /* |
| * Allocate card structure. |
| */ |
| card = mmc_alloc_card(host); |
| if (IS_ERR(card)) |
| goto err; |
| |
| card->type = MMC_TYPE_SD; |
| memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); |
| } |
| |
| /* |
| * Set card RCA. |
| */ |
| err = mmc_send_relative_addr(host, &card->rca); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| |
| mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); |
| |
| if (!oldcard) { |
| /* |
| * Fetch CSD from card. |
| */ |
| err = mmc_send_csd(card, card->raw_csd); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| |
| err = mmc_decode_csd(card); |
| if (err < 0) |
| goto free_card; |
| |
| mmc_decode_cid(card); |
| } |
| |
| /* |
| * Select card, as all following commands rely on that. |
| */ |
| err = mmc_select_card(card); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| |
| if (!oldcard) { |
| /* |
| * Fetch SCR from card. |
| */ |
| err = mmc_app_send_scr(card, card->raw_scr); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| |
| err = mmc_decode_scr(card); |
| if (err < 0) |
| goto free_card; |
| |
| /* |
| * Fetch switch information from card. |
| */ |
| err = mmc_read_switch(card); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| } |
| |
| /* |
| * Attempt to change to high-speed (if supported) |
| */ |
| err = mmc_switch_hs(card); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| |
| /* |
| * Compute bus speed. |
| */ |
| max_dtr = (unsigned int)-1; |
| |
| if (mmc_card_highspeed(card)) { |
| if (max_dtr > card->sw_caps.hs_max_dtr) |
| max_dtr = card->sw_caps.hs_max_dtr; |
| } else if (max_dtr > card->csd.max_dtr) { |
| max_dtr = card->csd.max_dtr; |
| } |
| |
| mmc_set_clock(host, max_dtr); |
| |
| /* |
| * Switch to wider bus (if supported). |
| */ |
| if ((host->caps & MMC_CAP_4_BIT_DATA) && |
| (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
| err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); |
| if (err != MMC_ERR_NONE) |
| goto free_card; |
| |
| mmc_set_bus_width(host, MMC_BUS_WIDTH_4); |
| } |
| |
| /* |
| * Check if read-only switch is active. |
| */ |
| if (!oldcard) { |
| if (!host->ops->get_ro) { |
| printk(KERN_WARNING "%s: host does not " |
| "support reading read-only " |
| "switch. assuming write-enable.\n", |
| mmc_hostname(host)); |
| } else { |
| if (host->ops->get_ro(host)) |
| mmc_card_set_readonly(card); |
| } |
| } |
| |
| if (!oldcard) |
| host->card = card; |
| |
| return MMC_ERR_NONE; |
| |
| free_card: |
| if (!oldcard) |
| mmc_remove_card(card); |
| err: |
| |
| return MMC_ERR_FAILED; |
| } |
| |
| /* |
| * Host is being removed. Free up the current card. |
| */ |
| static void mmc_sd_remove(struct mmc_host *host) |
| { |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_remove_card(host->card); |
| host->card = NULL; |
| } |
| |
| /* |
| * Card detection callback from host. |
| */ |
| static void mmc_sd_detect(struct mmc_host *host) |
| { |
| int err; |
| |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_claim_host(host); |
| |
| /* |
| * Just check if our card has been removed. |
| */ |
| err = mmc_send_status(host->card, NULL); |
| |
| mmc_release_host(host); |
| |
| if (err != MMC_ERR_NONE) { |
| mmc_sd_remove(host); |
| |
| mmc_claim_host(host); |
| mmc_detach_bus(host); |
| mmc_release_host(host); |
| } |
| } |
| |
| MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], |
| card->raw_cid[2], card->raw_cid[3]); |
| MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], |
| card->raw_csd[2], card->raw_csd[3]); |
| MMC_ATTR_FN(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); |
| MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year); |
| MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev); |
| MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev); |
| MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid); |
| MMC_ATTR_FN(name, "%s\n", card->cid.prod_name); |
| MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid); |
| MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial); |
| |
| static struct device_attribute mmc_sd_dev_attrs[] = { |
| MMC_ATTR_RO(cid), |
| MMC_ATTR_RO(csd), |
| MMC_ATTR_RO(scr), |
| MMC_ATTR_RO(date), |
| MMC_ATTR_RO(fwrev), |
| MMC_ATTR_RO(hwrev), |
| MMC_ATTR_RO(manfid), |
| MMC_ATTR_RO(name), |
| MMC_ATTR_RO(oemid), |
| MMC_ATTR_RO(serial), |
| __ATTR_NULL, |
| }; |
| |
| /* |
| * Adds sysfs entries as relevant. |
| */ |
| static int mmc_sd_sysfs_add(struct mmc_host *host, struct mmc_card *card) |
| { |
| int ret; |
| |
| ret = mmc_add_attrs(card, mmc_sd_dev_attrs); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| /* |
| * Removes the sysfs entries added by mmc_sysfs_add(). |
| */ |
| static void mmc_sd_sysfs_remove(struct mmc_host *host, struct mmc_card *card) |
| { |
| mmc_remove_attrs(card, mmc_sd_dev_attrs); |
| } |
| |
| #ifdef CONFIG_MMC_UNSAFE_RESUME |
| |
| /* |
| * Suspend callback from host. |
| */ |
| static void mmc_sd_suspend(struct mmc_host *host) |
| { |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_claim_host(host); |
| mmc_deselect_cards(host); |
| host->card->state &= ~MMC_STATE_HIGHSPEED; |
| mmc_release_host(host); |
| } |
| |
| /* |
| * Resume callback from host. |
| * |
| * This function tries to determine if the same card is still present |
| * and, if so, restore all state to it. |
| */ |
| static void mmc_sd_resume(struct mmc_host *host) |
| { |
| int err; |
| |
| BUG_ON(!host); |
| BUG_ON(!host->card); |
| |
| mmc_claim_host(host); |
| |
| err = mmc_sd_init_card(host, host->ocr, host->card); |
| if (err != MMC_ERR_NONE) { |
| mmc_sd_remove(host); |
| mmc_detach_bus(host); |
| } |
| |
| mmc_release_host(host); |
| } |
| |
| #else |
| |
| #define mmc_sd_suspend NULL |
| #define mmc_sd_resume NULL |
| |
| #endif |
| |
| static const struct mmc_bus_ops mmc_sd_ops = { |
| .remove = mmc_sd_remove, |
| .detect = mmc_sd_detect, |
| .sysfs_add = mmc_sd_sysfs_add, |
| .sysfs_remove = mmc_sd_sysfs_remove, |
| .suspend = mmc_sd_suspend, |
| .resume = mmc_sd_resume, |
| }; |
| |
| /* |
| * Starting point for SD card init. |
| */ |
| int mmc_attach_sd(struct mmc_host *host, u32 ocr) |
| { |
| int err; |
| |
| BUG_ON(!host); |
| BUG_ON(!host->claimed); |
| |
| mmc_attach_bus(host, &mmc_sd_ops); |
| |
| /* |
| * Sanity check the voltages that the card claims to |
| * support. |
| */ |
| if (ocr & 0x7F) { |
| printk(KERN_WARNING "%s: card claims to support voltages " |
| "below the defined range. These will be ignored.\n", |
| mmc_hostname(host)); |
| ocr &= ~0x7F; |
| } |
| |
| if (ocr & MMC_VDD_165_195) { |
| printk(KERN_WARNING "%s: SD card claims to support the " |
| "incompletely defined 'low voltage range'. This " |
| "will be ignored.\n", mmc_hostname(host)); |
| ocr &= ~MMC_VDD_165_195; |
| } |
| |
| host->ocr = mmc_select_voltage(host, ocr); |
| |
| /* |
| * Can we support the voltage(s) of the card(s)? |
| */ |
| if (!host->ocr) |
| goto err; |
| |
| /* |
| * Detect and init the card. |
| */ |
| err = mmc_sd_init_card(host, host->ocr, NULL); |
| if (err != MMC_ERR_NONE) |
| goto err; |
| |
| mmc_release_host(host); |
| |
| err = mmc_add_card(host->card); |
| if (err) |
| goto reclaim_host; |
| |
| return 0; |
| |
| reclaim_host: |
| mmc_claim_host(host); |
| mmc_remove_card(host->card); |
| host->card = NULL; |
| err: |
| mmc_detach_bus(host); |
| mmc_release_host(host); |
| |
| return 0; |
| } |
| |