diff options
Diffstat (limited to 'drivers/mmc/mmc.c')
| -rw-r--r-- | drivers/mmc/mmc.c | 914 |
1 files changed, 914 insertions, 0 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c new file mode 100644 index 0000000..e400263 --- /dev/null +++ b/drivers/mmc/mmc.c @@ -0,0 +1,914 @@ +/* + * linux/drivers/mmc/mmc.c + * + * Copyright (C) 2003-2004 Russell King, 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/config.h> +#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 <linux/mmc/card.h> +#include <linux/mmc/host.h> +#include <linux/mmc/protocol.h> + +#include "mmc.h" + +#ifdef CONFIG_MMC_DEBUG +#define DBG(x...) printk(KERN_DEBUG x) +#else +#define DBG(x...) do { } while (0) +#endif + +#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 command + * @host: MMC host which completed command + * @mrq: MMC request which completed + * + * MMC drivers should call this function when they have completed + * their processing of a command. This should be called before the + * data part of the command has completed. + */ +void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) +{ + struct mmc_command *cmd = mrq->cmd; + int err = mrq->cmd->error; + DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode, + err, 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) +{ + DBG("MMC: starting cmd %02x arg %08x flags %08x\n", + mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); + + WARN_ON(host->card_busy == NULL); + + mrq->cmd->error = 0; + mrq->cmd->mrq = mrq; + if (mrq->data) { + 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(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->card_busy == NULL); + + 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_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->card_busy == NULL) + break; + spin_unlock_irqrestore(&host->lock, flags); + schedule(); + spin_lock_irqsave(&host->lock, flags); + } + set_current_state(TASK_RUNNING); + host->card_busy = card; + spin_unlock_irqrestore(&host->lock, flags); + remove_wait_queue(&host->wq, &wait); + + if (card != (void *)-1 && host->card_selected != card) { + struct mmc_command cmd; + + host->card_selected = card; + + cmd.opcode = MMC_SELECT_CARD; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1; + + err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); + } + + 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->card_busy == NULL); + + spin_lock_irqsave(&host->lock, flags); + host->card_busy = NULL; + spin_unlock_irqrestore(&host->lock, flags); + + wake_up(&host->wq); +} + +EXPORT_SYMBOL(mmc_release_host); + +/* + * 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_wait_for_cmd(host, &cmd, 0); + } +} + + +static inline void mmc_delay(unsigned int ms) +{ + if (ms < HZ / 1000) { + yield(); + mdelay(ms); + } else { + msleep_interruptible (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; + host->ops->set_ios(host, &host->ios); + } 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)); + + /* + * The selection of the format here is guesswork based upon + * information people have sent to date. + */ + switch (card->csd.mmca_vsn) { + case 0: /* MMC v1.? */ + 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.x ? */ + case 3: /* MMC v3.x ? */ + 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", + card->host->host_name, 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; + + /* + * We only understand CSD structure v1.1 and v2. + * v2 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", + card->host->host_name, 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); +} + +/* + * 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; + + cmd.opcode = MMC_GO_IDLE_STATE; + cmd.arg = 0; + cmd.flags = MMC_RSP_NONE; + + mmc_wait_for_cmd(host, &cmd, 0); + + mmc_delay(1); +} + +/* + * Apply power to the MMC stack. + */ +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.power_mode = MMC_POWER_UP; + host->ops->set_ios(host, &host->ios); + + mmc_delay(1); + + host->ios.clock = host->f_min; + host->ios.power_mode = MMC_POWER_ON; + host->ops->set_ios(host, &host->ios); + + 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.power_mode = MMC_POWER_OFF; + host->ops->set_ios(host, &host->ios); +} + +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; + + 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; +} + +/* + * 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; + + 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", + host->host_name, 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; + + cmd.opcode = MMC_SET_RELATIVE_ADDR; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_R1; + + 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; + + 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 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) && max_dtr > card->csd.max_dtr) + max_dtr = card->csd.max_dtr; + + DBG("MMC: selected %d.%03dMHz transfer rate\n", + 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; + + 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; + + mmc_power_up(host); + mmc_idle_cards(host); + + 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; + host->ops->set_ios(host, &host->ios); + + /* + * 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.) + */ + 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; + host->ops->set_ios(host, &host->ios); + + mmc_read_csds(host); +} + + +/** + * mmc_detect_change - process change of state on a MMC socket + * @host: host which changed state. + * + * 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) +{ + schedule_work(&host->detect); +} + +EXPORT_SYMBOL(mmc_detect_change); + + +static void mmc_rescan(void *data) +{ + struct mmc_host *host = data; + struct list_head *l, *n; + + mmc_claim_host(host); + + if (host->ios.power_mode == MMC_POWER_ON) + mmc_check_cards(host); + + mmc_setup(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); + host->ops->set_ios(host, &host->ios); + } + + 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 = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); + if (host) { + memset(host, 0, sizeof(struct mmc_host) + extra); + + spin_lock_init(&host->lock); + init_waitqueue_head(&host->wq); + INIT_LIST_HEAD(&host->cards); + INIT_WORK(&host->detect, mmc_rescan, host); + + host->dev = dev; + + /* + * 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_sectors = 1 << (PAGE_CACHE_SHIFT - 9); + host->max_seg_size = PAGE_CACHE_SIZE; + } + + return host; +} + +EXPORT_SYMBOL(mmc_alloc_host); + +/** + * mmc_add_host - initialise host hardware + * @host: mmc host + */ +int mmc_add_host(struct mmc_host *host) +{ + static unsigned int host_num; + + snprintf(host->host_name, sizeof(host->host_name), + "mmc%d", host_num++); + + mmc_power_off(host); + mmc_detect_change(host); + + return 0; +} + +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); +} + +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) +{ + flush_scheduled_work(); + kfree(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, u32 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_detect_change(host); + + return 0; +} + +EXPORT_SYMBOL(mmc_resume_host); + +#endif + +MODULE_LICENSE("GPL"); |