diff options
Diffstat (limited to 'drivers/mmc/mmc.c')
| -rw-r--r-- | drivers/mmc/mmc.c | 1724 |
1 files changed, 0 insertions, 1724 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c deleted file mode 100644 index 4a73e8b2428d..000000000000 --- a/drivers/mmc/mmc.c +++ /dev/null @@ -1,1724 +0,0 @@ -/* - * linux/drivers/mmc/mmc.c - * - * Copyright (C) 2003-2004 Russell King, All Rights Reserved. - * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. - * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved. - * MMCv4 support Copyright (C) 2006 Philip Langdale, 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/module.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/completion.h> -#include <linux/device.h> -#include <linux/delay.h> -#include <linux/pagemap.h> -#include <linux/err.h> -#include <asm/scatterlist.h> -#include <linux/scatterlist.h> - -#include <linux/mmc/card.h> -#include <linux/mmc/host.h> -#include <linux/mmc/protocol.h> - -#include "mmc.h" - -#define CMD_RETRIES 3 - -/* - * OCR Bit positions to 10s of Vdd mV. - */ -static const unsigned short mmc_ocr_bit_to_vdd[] = { - 150, 155, 160, 165, 170, 180, 190, 200, - 210, 220, 230, 240, 250, 260, 270, 280, - 290, 300, 310, 320, 330, 340, 350, 360 -}; - -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, -}; - - -/** - * mmc_request_done - finish processing an MMC request - * @host: MMC host which completed request - * @mrq: MMC request which request - * - * MMC drivers should call this function when they have completed - * their processing of a request. - */ -void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) -{ - struct mmc_command *cmd = mrq->cmd; - int err = cmd->error; - - pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n", - mmc_hostname(host), cmd->opcode, err, - mrq->data ? mrq->data->error : 0, - mrq->stop ? mrq->stop->error : 0, - cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); - - if (err && cmd->retries) { - cmd->retries--; - cmd->error = 0; - host->ops->request(host, mrq); - } else if (mrq->done) { - mrq->done(mrq); - } -} - -EXPORT_SYMBOL(mmc_request_done); - -/** - * mmc_start_request - start a command on a host - * @host: MMC host to start command on - * @mrq: MMC request to start - * - * Queue a command on the specified host. We expect the - * caller to be holding the host lock with interrupts disabled. - */ -void -mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) -{ - pr_debug("%s: starting CMD%u arg %08x flags %08x\n", - mmc_hostname(host), mrq->cmd->opcode, - mrq->cmd->arg, mrq->cmd->flags); - - WARN_ON(!host->claimed); - - mrq->cmd->error = 0; - mrq->cmd->mrq = mrq; - if (mrq->data) { - BUG_ON(mrq->data->blksz > host->max_blk_size); - BUG_ON(mrq->data->blocks > host->max_blk_count); - BUG_ON(mrq->data->blocks * mrq->data->blksz > - host->max_req_size); - - mrq->cmd->data = mrq->data; - mrq->data->error = 0; - mrq->data->mrq = mrq; - if (mrq->stop) { - mrq->data->stop = mrq->stop; - mrq->stop->error = 0; - mrq->stop->mrq = mrq; - } - } - host->ops->request(host, mrq); -} - -EXPORT_SYMBOL(mmc_start_request); - -static void mmc_wait_done(struct mmc_request *mrq) -{ - complete(mrq->done_data); -} - -int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) -{ - DECLARE_COMPLETION_ONSTACK(complete); - - mrq->done_data = &complete; - mrq->done = mmc_wait_done; - - mmc_start_request(host, mrq); - - wait_for_completion(&complete); - - return 0; -} - -EXPORT_SYMBOL(mmc_wait_for_req); - -/** - * mmc_wait_for_cmd - start a command and wait for completion - * @host: MMC host to start command - * @cmd: MMC command to start - * @retries: maximum number of retries - * - * Start a new MMC command for a host, and wait for the command - * to complete. Return any error that occurred while the command - * was executing. Do not attempt to parse the response. - */ -int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) -{ - struct mmc_request mrq; - - BUG_ON(!host->claimed); - - memset(&mrq, 0, sizeof(struct mmc_request)); - - memset(cmd->resp, 0, sizeof(cmd->resp)); - cmd->retries = retries; - - mrq.cmd = cmd; - cmd->data = NULL; - - mmc_wait_for_req(host, &mrq); - - return cmd->error; -} - -EXPORT_SYMBOL(mmc_wait_for_cmd); - -/** - * mmc_wait_for_app_cmd - start an application command and wait for - completion - * @host: MMC host to start command - * @rca: RCA to send MMC_APP_CMD to - * @cmd: MMC command to start - * @retries: maximum number of retries - * - * Sends a MMC_APP_CMD, checks the card response, sends the command - * in the parameter and waits for it to complete. Return any error - * that occurred while the command was executing. Do not attempt to - * parse the response. - */ -int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, - struct mmc_command *cmd, int retries) -{ - struct mmc_request mrq; - struct mmc_command appcmd; - - int i, err; - - BUG_ON(!host->claimed); - BUG_ON(retries < 0); - - err = MMC_ERR_INVALID; - - /* - * We have to resend MMC_APP_CMD for each attempt so - * we cannot use the retries field in mmc_command. - */ - for (i = 0;i <= retries;i++) { - memset(&mrq, 0, sizeof(struct mmc_request)); - - appcmd.opcode = MMC_APP_CMD; - appcmd.arg = rca << 16; - appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - appcmd.retries = 0; - memset(appcmd.resp, 0, sizeof(appcmd.resp)); - appcmd.data = NULL; - - mrq.cmd = &appcmd; - appcmd.data = NULL; - - mmc_wait_for_req(host, &mrq); - - if (appcmd.error) { - err = appcmd.error; - continue; - } - - /* Check that card supported application commands */ - if (!(appcmd.resp[0] & R1_APP_CMD)) - return MMC_ERR_FAILED; - - memset(&mrq, 0, sizeof(struct mmc_request)); - - memset(cmd->resp, 0, sizeof(cmd->resp)); - cmd->retries = 0; - - mrq.cmd = cmd; - cmd->data = NULL; - - mmc_wait_for_req(host, &mrq); - - err = cmd->error; - if (cmd->error == MMC_ERR_NONE) - break; - } - - return err; -} - -EXPORT_SYMBOL(mmc_wait_for_app_cmd); - -/** - * mmc_set_data_timeout - set the timeout for a data command - * @data: data phase for command - * @card: the MMC card associated with the data transfer - * @write: flag to differentiate reads from writes - */ -void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card, - int write) -{ - unsigned int mult; - - /* - * SD cards use a 100 multiplier rather than 10 - */ - mult = mmc_card_sd(card) ? 100 : 10; - - /* - * Scale up the multiplier (and therefore the timeout) by - * the r2w factor for writes. - */ - if (write) - mult <<= card->csd.r2w_factor; - - data->timeout_ns = card->csd.tacc_ns * mult; - data->timeout_clks = card->csd.tacc_clks * mult; - - /* - * SD cards also have an upper limit on the timeout. - */ - if (mmc_card_sd(card)) { - unsigned int timeout_us, limit_us; - - timeout_us = data->timeout_ns / 1000; - timeout_us += data->timeout_clks * 1000 / - (card->host->ios.clock / 1000); - - if (write) - limit_us = 250000; - else - limit_us = 100000; - - /* - * SDHC cards always use these fixed values. - */ - if (timeout_us > limit_us || mmc_card_blockaddr(card)) { - data->timeout_ns = limit_us * 1000; - data->timeout_clks = 0; - } - } -} -EXPORT_SYMBOL(mmc_set_data_timeout); - -static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); - -/** - * __mmc_claim_host - exclusively claim a host - * @host: mmc host to claim - * @card: mmc card to claim host for - * - * Claim a host for a set of operations. If a valid card - * is passed and this wasn't the last card selected, select - * the card before returning. - * - * Note: you should use mmc_card_claim_host or mmc_claim_host. - */ -int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) -{ - DECLARE_WAITQUEUE(wait, current); - unsigned long flags; - int err = 0; - - add_wait_queue(&host->wq, &wait); - spin_lock_irqsave(&host->lock, flags); - while (1) { - set_current_state(TASK_UNINTERRUPTIBLE); - if (!host->claimed) - break; - spin_unlock_irqrestore(&host->lock, flags); - schedule(); - spin_lock_irqsave(&host->lock, flags); - } - set_current_state(TASK_RUNNING); - host->claimed = 1; - spin_unlock_irqrestore(&host->lock, flags); - remove_wait_queue(&host->wq, &wait); - - if (card != (void *)-1) { - err = mmc_select_card(host, card); - if (err != MMC_ERR_NONE) - return err; - } - - return err; -} - -EXPORT_SYMBOL(__mmc_claim_host); - -/** - * mmc_release_host - release a host - * @host: mmc host to release - * - * Release a MMC host, allowing others to claim the host - * for their operations. - */ -void mmc_release_host(struct mmc_host *host) -{ - unsigned long flags; - - BUG_ON(!host->claimed); - - spin_lock_irqsave(&host->lock, flags); - host->claimed = 0; - spin_unlock_irqrestore(&host->lock, flags); - - wake_up(&host->wq); -} - -EXPORT_SYMBOL(mmc_release_host); - -static inline void mmc_set_ios(struct mmc_host *host) -{ - struct mmc_ios *ios = &host->ios; - - pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " - "width %u timing %u\n", - mmc_hostname(host), ios->clock, ios->bus_mode, - ios->power_mode, ios->chip_select, ios->vdd, - ios->bus_width, ios->timing); - - host->ops->set_ios(host, ios); -} - -static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) -{ - int err; - struct mmc_command cmd; - - BUG_ON(!host->claimed); - - if (host->card_selected == card) - return MMC_ERR_NONE; - - host->card_selected = card; - - cmd.opcode = MMC_SELECT_CARD; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) - return err; - - /* - * We can only change the bus width of SD cards when - * they are selected so we have to put the handling - * here. - * - * The card is in 1 bit mode by default so - * we only need to change if it supports the - * wider version. - */ - if (mmc_card_sd(card) && - (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { - - /* - * Default bus width is 1 bit. - */ - host->ios.bus_width = MMC_BUS_WIDTH_1; - - if (host->caps & MMC_CAP_4_BIT_DATA) { - struct mmc_command cmd; - cmd.opcode = SD_APP_SET_BUS_WIDTH; - cmd.arg = SD_BUS_WIDTH_4; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - - err = mmc_wait_for_app_cmd(host, card->rca, &cmd, - CMD_RETRIES); - if (err != MMC_ERR_NONE) - return err; - - host->ios.bus_width = MMC_BUS_WIDTH_4; - } - } - - mmc_set_ios(host); - - return MMC_ERR_NONE; -} - -/* - * Ensure that no card is selected. - */ -static void mmc_deselect_cards(struct mmc_host *host) -{ - struct mmc_command cmd; - - if (host->card_selected) { - host->card_selected = NULL; - - cmd.opcode = MMC_SELECT_CARD; - cmd.arg = 0; - cmd.flags = MMC_RSP_NONE | MMC_CMD_AC; - - mmc_wait_for_cmd(host, &cmd, 0); - } -} - - -static inline void mmc_delay(unsigned int ms) -{ - if (ms < 1000 / HZ) { - cond_resched(); - mdelay(ms); - } else { - msleep(ms); - } -} - -/* - * Mask off any voltages we don't support and select - * the lowest voltage - */ -static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) -{ - int bit; - - ocr &= host->ocr_avail; - - bit = ffs(ocr); - if (bit) { - bit -= 1; - - ocr &= 3 << bit; - - host->ios.vdd = bit; - mmc_set_ios(host); - } else { - ocr = 0; - } - - return ocr; -} - -#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)); - - if (mmc_card_sd(card)) { - /* - * 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 */ - } else { - /* - * The selection of the format here is based upon published - * specs from sandisk and from what people have reported. - */ - switch (card->csd.mmca_vsn) { - case 0: /* MMC v1.0 - v1.2 */ - case 1: /* MMC v1.4 */ - card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); - 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.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); - card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); - card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); - card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); - card->cid.serial = UNSTUFF_BITS(resp, 16, 24); - card->cid.month = UNSTUFF_BITS(resp, 12, 4); - card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; - break; - - case 2: /* MMC v2.0 - v2.2 */ - case 3: /* MMC v3.1 - v3.3 */ - case 4: /* MMC v4 */ - 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.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); - card->cid.serial = UNSTUFF_BITS(resp, 16, 32); - card->cid.month = UNSTUFF_BITS(resp, 12, 4); - card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; - break; - - default: - printk("%s: card has unknown MMCA version %d\n", - mmc_hostname(card->host), card->csd.mmca_vsn); - mmc_card_set_bad(card); - break; - } - } -} - -/* - * Given a 128-bit response, decode to our card CSD structure. - */ -static void mmc_decode_csd(struct mmc_card *card) -{ - struct mmc_csd *csd = &card->csd; - unsigned int e, m, csd_struct; - u32 *resp = card->raw_csd; - - if (mmc_card_sd(card)) { - 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); - mmc_card_set_bad(card); - return; - } - } else { - /* - * We only understand CSD structure v1.1 and v1.2. - * v1.2 has extra information in bits 15, 11 and 10. - */ - csd_struct = UNSTUFF_BITS(resp, 126, 2); - if (csd_struct != 1 && csd_struct != 2) { - printk("%s: unrecognised CSD structure version %d\n", - mmc_hostname(card->host), csd_struct); - mmc_card_set_bad(card); - return; - } - - csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); - 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); - } -} - -/* - * Given a 64-bit response, decode to our card SCR structure. - */ -static void 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); - mmc_card_set_bad(card); - return; - } - - scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); - scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); -} - -/* - * Locate a MMC card on this MMC host given a raw CID. - */ -static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) -{ - struct mmc_card *card; - - list_for_each_entry(card, &host->cards, node) { - if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) - return card; - } - return NULL; -} - -/* - * Allocate a new MMC card, and assign a unique RCA. - */ -static struct mmc_card * -mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) -{ - struct mmc_card *card, *c; - unsigned int rca = *frca; - - card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); - if (!card) - return ERR_PTR(-ENOMEM); - - mmc_init_card(card, host); - memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); - - again: - list_for_each_entry(c, &host->cards, node) - if (c->rca == rca) { - rca++; - goto again; - } - - card->rca = rca; - - *frca = rca; - - return card; -} - -/* - * Tell attached cards to go to IDLE state - */ -static void mmc_idle_cards(struct mmc_host *host) -{ - struct mmc_command cmd; - - host->ios.chip_select = MMC_CS_HIGH; - mmc_set_ios(host); - - mmc_delay(1); - - cmd.opcode = MMC_GO_IDLE_STATE; - cmd.arg = 0; - cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; - - mmc_wait_for_cmd(host, &cmd, 0); - - mmc_delay(1); - - host->ios.chip_select = MMC_CS_DONTCARE; - mmc_set_ios(host); - - mmc_delay(1); -} - -/* - * Apply power to the MMC stack. This is a two-stage process. - * First, we enable power to the card without the clock running. - * We then wait a bit for the power to stabilise. Finally, - * enable the bus drivers and clock to the card. - * - * We must _NOT_ enable the clock prior to power stablising. - * - * If a host does all the power sequencing itself, ignore the - * initial MMC_POWER_UP stage. - */ -static void mmc_power_up(struct mmc_host *host) -{ - int bit = fls(host->ocr_avail) - 1; - - host->ios.vdd = bit; - host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; - host->ios.chip_select = MMC_CS_DONTCARE; - host->ios.power_mode = MMC_POWER_UP; - host->ios.bus_width = MMC_BUS_WIDTH_1; - host->ios.timing = MMC_TIMING_LEGACY; - mmc_set_ios(host); - - mmc_delay(1); - - host->ios.clock = host->f_min; - host->ios.power_mode = MMC_POWER_ON; - mmc_set_ios(host); - - mmc_delay(2); -} - -static void mmc_power_off(struct mmc_host *host) -{ - host->ios.clock = 0; - host->ios.vdd = 0; - host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; - host->ios.chip_select = MMC_CS_DONTCARE; - host->ios.power_mode = MMC_POWER_OFF; - host->ios.bus_width = MMC_BUS_WIDTH_1; - host->ios.timing = MMC_TIMING_LEGACY; - mmc_set_ios(host); -} - -static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) -{ - struct mmc_command cmd; - int i, err = 0; - - cmd.opcode = MMC_SEND_OP_COND; - cmd.arg = ocr; - cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; - - for (i = 100; i; i--) { - err = mmc_wait_for_cmd(host, &cmd, 0); - if (err != MMC_ERR_NONE) - break; - - if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) - break; - - err = MMC_ERR_TIMEOUT; - - mmc_delay(10); - } - - if (rocr) - *rocr = cmd.resp[0]; - - return err; -} - -static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) -{ - struct mmc_command cmd; - int i, err = 0; - - cmd.opcode = SD_APP_OP_COND; - cmd.arg = ocr; - cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; - - for (i = 100; i; i--) { - err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) - break; - - if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) - break; - - err = MMC_ERR_TIMEOUT; - - mmc_delay(10); - } - - if (rocr) - *rocr = cmd.resp[0]; - - return err; -} - -static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2) -{ - struct mmc_command cmd; - int err, sd2; - static const u8 test_pattern = 0xAA; - - /* - * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND - * before SD_APP_OP_COND. This command will harmlessly fail for - * SD 1.0 cards. - */ - cmd.opcode = SD_SEND_IF_COND; - cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; - cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR; - - err = mmc_wait_for_cmd(host, &cmd, 0); - if (err == MMC_ERR_NONE) { - if ((cmd.resp[0] & 0xFF) == test_pattern) { - sd2 = 1; - } else { - sd2 = 0; - err = MMC_ERR_FAILED; - } - } else { - /* - * Treat errors as SD 1.0 card. - */ - sd2 = 0; - err = MMC_ERR_NONE; - } - if (rsd2) - *rsd2 = sd2; - return err; -} - -/* - * Discover cards by requesting their CID. If this command - * times out, it is not an error; there are no further cards - * to be discovered. Add new cards to the list. - * - * Create a mmc_card entry for each discovered card, assigning - * it an RCA, and save the raw CID for decoding later. - */ -static void mmc_discover_cards(struct mmc_host *host) -{ - struct mmc_card *card; - unsigned int first_rca = 1, err; - - while (1) { - struct mmc_command cmd; - - cmd.opcode = MMC_ALL_SEND_CID; - cmd.arg = 0; - cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err == MMC_ERR_TIMEOUT) { - err = MMC_ERR_NONE; - break; - } - if (err != MMC_ERR_NONE) { - printk(KERN_ERR "%s: error requesting CID: %d\n", - mmc_hostname(host), err); - break; - } - - card = mmc_find_card(host, cmd.resp); - if (!card) { - card = mmc_alloc_card(host, cmd.resp, &first_rca); - if (IS_ERR(card)) { - err = PTR_ERR(card); - break; - } - list_add(&card->node, &host->cards); - } - - card->state &= ~MMC_STATE_DEAD; - - if (host->mode == MMC_MODE_SD) { - mmc_card_set_sd(card); - - cmd.opcode = SD_SEND_RELATIVE_ADDR; - cmd.arg = 0; - cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) - mmc_card_set_dead(card); - else { - card->rca = cmd.resp[0] >> 16; - - 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); - } - } - } else { - cmd.opcode = MMC_SET_RELATIVE_ADDR; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) - mmc_card_set_dead(card); - } - } -} - -static void mmc_read_csds(struct mmc_host *host) -{ - struct mmc_card *card; - - list_for_each_entry(card, &host->cards, node) { - struct mmc_command cmd; - int err; - - if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) - continue; - - cmd.opcode = MMC_SEND_CSD; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) { - mmc_card_set_dead(card); - continue; - } - - memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); - - mmc_decode_csd(card); - mmc_decode_cid(card); - } -} - -static void mmc_process_ext_csds(struct mmc_host *host) -{ - int err; - struct mmc_card *card; - - struct mmc_request mrq; - struct mmc_command cmd; - struct mmc_data data; - - struct scatterlist sg; - - /* - * As the ext_csd is so large and mostly unused, we don't store the - * raw block in mmc_card. - */ - u8 *ext_csd; - ext_csd = kmalloc(512, GFP_KERNEL); - if (!ext_csd) { - printk("%s: could not allocate a buffer to receive the ext_csd." - "mmc v4 cards will be treated as v3.\n", - mmc_hostname(host)); - return; - } - - list_for_each_entry(card, &host->cards, node) { - if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) - continue; - if (mmc_card_sd(card)) - continue; - if (card->csd.mmca_vsn < CSD_SPEC_VER_4) - continue; - - err = mmc_select_card(host, card); - if (err != MMC_ERR_NONE) { - mmc_card_set_dead(card); - continue; - } - - memset(&cmd, 0, sizeof(struct mmc_command)); - - cmd.opcode = MMC_SEND_EXT_CSD; - cmd.arg = 0; - cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; - - memset(&data, 0, sizeof(struct mmc_data)); - - mmc_set_data_timeout(&data, card, 0); - - data.blksz = 512; - data.blocks = 1; - data.flags = MMC_DATA_READ; - data.sg = &sg; - data.sg_len = 1; - - memset(&mrq, 0, sizeof(struct mmc_request)); - - mrq.cmd = &cmd; - mrq.data = &data; - - sg_init_one(&sg, ext_csd, 512); - - mmc_wait_for_req(host, &mrq); - - if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { - printk("%s: unable to read EXT_CSD, performance " - "might suffer.\n", mmc_hostname(card->host)); - continue; - } - - switch (ext_csd[EXT_CSD_CARD_TYPE]) { - case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: - card->ext_csd.hs_max_dtr = 52000000; - break; - case EXT_CSD_CARD_TYPE_26: - card->ext_csd.hs_max_dtr = 26000000; - break; - default: - /* MMC v4 spec says this cannot happen */ - printk("%s: card is mmc v4 but doesn't support " - "any high-speed modes.\n", - mmc_hostname(card->host)); - continue; - } - - if (host->caps & MMC_CAP_MMC_HIGHSPEED) { - /* Activate highspeed support. */ - cmd.opcode = MMC_SWITCH; - cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | - (EXT_CSD_HS_TIMING << 16) | - (1 << 8) | - EXT_CSD_CMD_SET_NORMAL; - cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) { - printk("%s: failed to switch card to mmc v4 " - "high-speed mode.\n", - mmc_hostname(card->host)); - continue; - } - - mmc_card_set_highspeed(card); - - host->ios.timing = MMC_TIMING_SD_HS; - mmc_set_ios(host); - } - - /* Check for host support for wide-bus modes. */ - if (host->caps & MMC_CAP_4_BIT_DATA) { - /* Activate 4-bit support. */ - cmd.opcode = MMC_SWITCH; - cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | - (EXT_CSD_BUS_WIDTH << 16) | - (EXT_CSD_BUS_WIDTH_4 << 8) | - EXT_CSD_CMD_SET_NORMAL; - cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err != MMC_ERR_NONE) { - printk("%s: failed to switch card to " - "mmc v4 4-bit bus mode.\n", - mmc_hostname(card->host)); - continue; - } - - host->ios.bus_width = MMC_BUS_WIDTH_4; - mmc_set_ios(host); - } - } - - kfree(ext_csd); - - mmc_deselect_cards(host); -} - -static void mmc_read_scrs(struct mmc_host *host) -{ - int err; - struct mmc_card *card; - struct mmc_request mrq; - struct mmc_command cmd; - struct mmc_data data; - struct scatterlist sg; - - list_for_each_entry(card, &host->cards, node) { - if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) - continue; - if (!mmc_card_sd(card)) - continue; - - err = mmc_select_card(host, card); - if (err != MMC_ERR_NONE) { - mmc_card_set_dead(card); - continue; - } - - memset(&cmd, 0, sizeof(struct mmc_command)); - - cmd.opcode = MMC_APP_CMD; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, 0); - if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { - mmc_card_set_dead(card); - continue; - } - - memset(&cmd, 0, sizeof(struct mmc_command)); - - cmd.opcode = SD_APP_SEND_SCR; - cmd.arg = 0; - cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; - - memset(&data, 0, sizeof(struct mmc_data)); - - mmc_set_data_timeout(&data, card, 0); - - data.blksz = 1 << 3; - data.blocks = 1; - data.flags = MMC_DATA_READ; - data.sg = &sg; - data.sg_len = 1; - - memset(&mrq, 0, sizeof(struct mmc_request)); - - mrq.cmd = &cmd; - mrq.data = &data; - - sg_init_one(&sg, (u8*)card->raw_scr, 8); - - mmc_wait_for_req(host, &mrq); - - if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { - mmc_card_set_dead(card); - continue; - } - - card->raw_scr[0] = ntohl(card->raw_scr[0]); - card->raw_scr[1] = ntohl(card->raw_scr[1]); - - mmc_decode_scr(card); - } - - mmc_deselect_cards(host); -} - -static void mmc_read_switch_caps(struct mmc_host *host) -{ - int err; - struct mmc_card *card; - struct mmc_request mrq; - struct mmc_command cmd; - struct mmc_data data; - unsigned char *status; - struct scatterlist sg; - - if (!(host->caps & MMC_CAP_SD_HIGHSPEED)) - return; - - status = kmalloc(64, GFP_KERNEL); - if (!status) { - printk(KERN_WARNING "%s: Unable to allocate buffer for " - "reading switch capabilities.\n", - mmc_hostname(host)); - return; - } - - list_for_each_entry(card, &host->cards, node) { - if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) - continue; - if (!mmc_card_sd(card)) - continue; - if (card->scr.sda_vsn < SCR_SPEC_VER_1) - continue; - - err = mmc_select_card(host, card); - if (err != MMC_ERR_NONE) { - mmc_card_set_dead(card); - continue; - } - - memset(&cmd, 0, sizeof(struct mmc_command)); - - cmd.opcode = SD_SWITCH; - cmd.arg = 0x00FFFFF1; - cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; - - memset(&data, 0, sizeof(struct mmc_data)); - - mmc_set_data_timeout(&data, card, 0); - - data.blksz = 64; - data.blocks = 1; - data.flags = MMC_DATA_READ; - data.sg = &sg; - data.sg_len = 1; - - memset(&mrq, 0, sizeof(struct mmc_request)); - - mrq.cmd = &cmd; - mrq.data = &data; - - sg_init_one(&sg, status, 64); - - mmc_wait_for_req(host, &mrq); - - if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { - printk("%s: unable to read switch capabilities, " - "performance might suffer.\n", - mmc_hostname(card->host)); - continue; - } - - if (status[13] & 0x02) - card->sw_caps.hs_max_dtr = 50000000; - - memset(&cmd, 0, sizeof(struct mmc_command)); - - cmd.opcode = SD_SWITCH; - cmd.arg = 0x80FFFFF1; - cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; - - memset(&data, 0, sizeof(struct mmc_data)); - - mmc_set_data_timeout(&data, card, 0); - - data.blksz = 64; - data.blocks = 1; - data.flags = MMC_DATA_READ; - data.sg = &sg; - data.sg_len = 1; - - memset(&mrq, 0, sizeof(struct mmc_request)); - - mrq.cmd = &cmd; - mrq.data = &data; - - sg_init_one(&sg, status, 64); - - mmc_wait_for_req(host, &mrq); - - if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE || - (status[16] & 0xF) != 1) { - printk(KERN_WARNING "%s: Problem switching card " - "into high-speed mode!\n", - mmc_hostname(host)); - continue; - } - - mmc_card_set_highspeed(card); - - host->ios.timing = MMC_TIMING_SD_HS; - mmc_set_ios(host); - } - - kfree(status); - - mmc_deselect_cards(host); -} - -static unsigned int mmc_calculate_clock(struct mmc_host *host) -{ - struct mmc_card *card; - unsigned int max_dtr = host->f_max; - - list_for_each_entry(card, &host->cards, node) - if (!mmc_card_dead(card)) { - if (mmc_card_highspeed(card) && mmc_card_sd(card)) { - if (max_dtr > card->sw_caps.hs_max_dtr) - max_dtr = card->sw_caps.hs_max_dtr; - } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) { - if (max_dtr > card->ext_csd.hs_max_dtr) - max_dtr = card->ext_csd.hs_max_dtr; - } else if (max_dtr > card->csd.max_dtr) { - max_dtr = card->csd.max_dtr; - } - } - - pr_debug("%s: selected %d.%03dMHz transfer rate\n", - mmc_hostname(host), - max_dtr / 1000000, (max_dtr / 1000) % 1000); - - return max_dtr; -} - -/* - * Check whether cards we already know about are still present. - * We do this by requesting status, and checking whether a card - * responds. - * - * A request for status does not cause a state change in data - * transfer mode. - */ -static void mmc_check_cards(struct mmc_host *host) -{ - struct list_head *l, *n; - - mmc_deselect_cards(host); - - list_for_each_safe(l, n, &host->cards) { - struct mmc_card *card = mmc_list_to_card(l); - struct mmc_command cmd; - int err; - - cmd.opcode = MMC_SEND_STATUS; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - - err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); - if (err == MMC_ERR_NONE) - continue; - - mmc_card_set_dead(card); - } -} - -static void mmc_setup(struct mmc_host *host) -{ - if (host->ios.power_mode != MMC_POWER_ON) { - int err; - u32 ocr; - - host->mode = MMC_MODE_SD; - - mmc_power_up(host); - mmc_idle_cards(host); - - err = mmc_send_if_cond(host, host->ocr_avail, NULL); - if (err != MMC_ERR_NONE) { - return; - } - err = mmc_send_app_op_cond(host, 0, &ocr); - - /* - * If we fail to detect any SD cards then try - * searching for MMC cards. - */ - if (err != MMC_ERR_NONE) { - host->mode = MMC_MODE_MMC; - - err = mmc_send_op_cond(host, 0, &ocr); - if (err != MMC_ERR_NONE) - return; - } - - host->ocr = mmc_select_voltage(host, ocr); - - /* - * 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. - */ - if (host->ocr) - mmc_idle_cards(host); - } else { - host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; - host->ios.clock = host->f_min; - mmc_set_ios(host); - - /* - * We should remember the OCR mask from the existing - * cards, and detect the new cards OCR mask, combine - * the two and re-select the VDD. However, if we do - * change VDD, we should do an idle, and then do a - * full re-initialisation. We would need to notify - * drivers so that they can re-setup the cards as - * well, while keeping their queues at bay. - * - * For the moment, we take the easy way out - if the - * new cards don't like our currently selected VDD, - * they drop off the bus. - */ - } - - if (host->ocr == 0) - return; - - /* - * Send the selected OCR multiple times... until the cards - * all get the idea that they should be ready for CMD2. - * (My SanDisk card seems to need this.) - */ - if (host->mode == MMC_MODE_SD) { - int err, sd2; - err = mmc_send_if_cond(host, host->ocr, &sd2); - if (err == MMC_ERR_NONE) { - /* - * 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. - */ - mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL); - } - } else { - mmc_send_op_cond(host, host->ocr, NULL); - } - - mmc_discover_cards(host); - - /* - * Ok, now switch to push-pull mode. - */ - host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; - mmc_set_ios(host); - - mmc_read_csds(host); - - if (host->mode == MMC_MODE_SD) { - mmc_read_scrs(host); - mmc_read_switch_caps(host); - } else - mmc_process_ext_csds(host); -} - - -/** - * mmc_detect_change - process change of state on a MMC socket - * @host: host which changed state. - * @delay: optional delay to wait before detection (jiffies) - * - * All we know is that card(s) have been inserted or removed - * from the socket(s). We don't know which socket or cards. - */ -void mmc_detect_change(struct mmc_host *host, unsigned long delay) -{ - mmc_schedule_delayed_work(&host->detect, delay); -} - -EXPORT_SYMBOL(mmc_detect_change); - - -static void mmc_rescan(struct work_struct *work) -{ - struct mmc_host *host = - container_of(work, struct mmc_host, detect.work); - struct list_head *l, *n; - unsigned char power_mode; - - mmc_claim_host(host); - - /* - * Check for removed cards and newly inserted ones. We check for - * removed cards first so we can intelligently re-select the VDD. - */ - power_mode = host->ios.power_mode; - if (power_mode == MMC_POWER_ON) - mmc_check_cards(host); - - mmc_setup(host); - - /* - * Some broken cards process CMD1 even in stand-by state. There is - * no reply, but an ILLEGAL_COMMAND error is cached and returned - * after next command. We poll for card status here to clear any - * possibly pending error. - */ - if (power_mode == MMC_POWER_ON) - mmc_check_cards(host); - - if (!list_empty(&host->cards)) { - /* - * (Re-)calculate the fastest clock rate which the - * attached cards and the host support. - */ - host->ios.clock = mmc_calculate_clock(host); - mmc_set_ios(host); - } - - mmc_release_host(host); - - list_for_each_safe(l, n, &host->cards) { - struct mmc_card *card = mmc_list_to_card(l); - - /* - * If this is a new and good card, register it. - */ - if (!mmc_card_present(card) && !mmc_card_dead(card)) { - if (mmc_register_card(card)) - mmc_card_set_dead(card); - else - mmc_card_set_present(card); - } - - /* - * If this card is dead, destroy it. - */ - if (mmc_card_dead(card)) { - list_del(&card->node); - mmc_remove_card(card); - } - } - - /* - * If we discover that there are no cards on the - * bus, turn off the clock and power down. - */ - if (list_empty(&host->cards)) - mmc_power_off(host); -} - - -/** - * mmc_alloc_host - initialise the per-host structure. - * @extra: sizeof private data structure - * @dev: pointer to host device model structure - * - * Initialise the per-host structure. - */ -struct mmc_host *mmc_alloc_host(int extra, struct device *dev) -{ - struct mmc_host *host; - - host = mmc_alloc_host_sysfs(extra, dev); - if (host) { - spin_lock_init(&host->lock); - init_waitqueue_head(&host->wq); - INIT_LIST_HEAD(&host->cards); - INIT_DELAYED_WORK(&host->detect, mmc_rescan); - - /* - * By default, hosts do not support SGIO or large requests. - * They have to set these according to their abilities. - */ - host->max_hw_segs = 1; - host->max_phys_segs = 1; - host->max_seg_size = PAGE_CACHE_SIZE; - - host->max_req_size = PAGE_CACHE_SIZE; - host->max_blk_size = 512; - host->max_blk_count = PAGE_CACHE_SIZE / 512; - } - - return host; -} - -EXPORT_SYMBOL(mmc_alloc_host); - -/** - * mmc_add_host - initialise host hardware - * @host: mmc host - */ -int mmc_add_host(struct mmc_host *host) -{ - int ret; - - ret = mmc_add_host_sysfs(host); - if (ret == 0) { - mmc_power_off(host); - mmc_detect_change(host, 0); - } - - return ret; -} - -EXPORT_SYMBOL(mmc_add_host); - -/** - * mmc_remove_host - remove host hardware - * @host: mmc host - * - * Unregister and remove all cards associated with this host, - * and power down the MMC bus. - */ -void mmc_remove_host(struct mmc_host *host) -{ - struct list_head *l, *n; - - list_for_each_safe(l, n, &host->cards) { - struct mmc_card *card = mmc_list_to_card(l); - - mmc_remove_card(card); - } - - mmc_power_off(host); - mmc_remove_host_sysfs(host); -} - -EXPORT_SYMBOL(mmc_remove_host); - -/** - * mmc_free_host - free the host structure - * @host: mmc host - * - * Free the host once all references to it have been dropped. - */ -void mmc_free_host(struct mmc_host *host) -{ - mmc_flush_scheduled_work(); - mmc_free_host_sysfs(host); -} - -EXPORT_SYMBOL(mmc_free_host); - -#ifdef CONFIG_PM - -/** - * mmc_suspend_host - suspend a host - * @host: mmc host - * @state: suspend mode (PM_SUSPEND_xxx) - */ -int mmc_suspend_host(struct mmc_host *host, pm_message_t state) -{ - mmc_claim_host(host); - mmc_deselect_cards(host); - mmc_power_off(host); - mmc_release_host(host); - - return 0; -} - -EXPORT_SYMBOL(mmc_suspend_host); - -/** - * mmc_resume_host - resume a previously suspended host - * @host: mmc host - */ -int mmc_resume_host(struct mmc_host *host) -{ - mmc_rescan(&host->detect.work); - - return 0; -} - -EXPORT_SYMBOL(mmc_resume_host); - -#endif - -MODULE_LICENSE("GPL"); |