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-rw-r--r--drivers/mmc/mmc.c1724
1 files changed, 0 insertions, 1724 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
deleted file mode 100644
index 4a73e8b2428..00000000000
--- 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");