* 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.
*
* 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/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 "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
/*
/**
- * mmc_request_done - finish processing an MMC command
- * @host: MMC host which completed command
- * @mrq: MMC request which completed
+ * 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 command. This should be called before the
- * data part of the command has 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 = 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]);
+ 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--;
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);
+ 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->card_busy == NULL);
int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
{
- DECLARE_COMPLETION(complete);
+ DECLARE_COMPLETION_ONSTACK(complete);
mrq->done_data = &complete;
mrq->done = mmc_wait_done;
appcmd.opcode = MMC_APP_CMD;
appcmd.arg = rca << 16;
- appcmd.flags = MMC_RSP_R1;
+ appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
appcmd.retries = 0;
memset(appcmd.resp, 0, sizeof(appcmd.resp));
appcmd.data = NULL;
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;
+
+ if (timeout_us > limit_us) {
+ 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
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);
+ if (card != (void *)-1) {
+ err = mmc_select_card(host, card);
+ if (err != MMC_ERR_NONE)
+ return err;
}
return err;
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\n",
+ mmc_hostname(host), ios->clock, ios->bus_mode,
+ ios->power_mode, ios->chip_select, ios->vdd,
+ ios->bus_width);
+
+ 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->card_busy == NULL);
+
+ 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;
+
+ /*
+ * Default bus width is 1 bit.
+ */
+ host->ios.bus_width = MMC_BUS_WIDTH_1;
+
+ /*
+ * We can only change the bus width of the selected
+ * card so therefore we have to put the handling
+ * here.
+ */
+ if (host->caps & MMC_CAP_4_BIT_DATA) {
+ /*
+ * 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)) {
+ 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.
*/
cmd.opcode = MMC_SELECT_CARD;
cmd.arg = 0;
- cmd.flags = MMC_RSP_NONE;
+ cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
mmc_wait_for_cmd(host, &cmd, 0);
}
if (bit) {
bit -= 1;
- ocr = 3 << bit;
+ ocr &= 3 << bit;
host->ios.vdd = bit;
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
} else {
ocr = 0;
}
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);
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);
} else {
/*
* We only understand CSD structure v1.1 and v1.2.
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);
}
/*
struct mmc_command cmd;
host->ios.chip_select = MMC_CS_HIGH;
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
mmc_delay(1);
cmd.opcode = MMC_GO_IDLE_STATE;
cmd.arg = 0;
- cmd.flags = MMC_RSP_NONE;
+ 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;
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
mmc_delay(1);
}
/*
- * Apply power to the MMC stack.
+ * 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)
{
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.chip_select = MMC_CS_DONTCARE;
host->ios.power_mode = MMC_POWER_UP;
- host->ops->set_ios(host, &host->ios);
+ host->ios.bus_width = MMC_BUS_WIDTH_1;
+ mmc_set_ios(host);
mmc_delay(1);
host->ios.clock = host->f_min;
host->ios.power_mode = MMC_POWER_ON;
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
mmc_delay(2);
}
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.chip_select = MMC_CS_DONTCARE;
host->ios.power_mode = MMC_POWER_OFF;
- host->ops->set_ios(host, &host->ios);
+ host->ios.bus_width = MMC_BUS_WIDTH_1;
+ mmc_set_ios(host);
}
static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
cmd.opcode = MMC_SEND_OP_COND;
cmd.arg = ocr;
- cmd.flags = MMC_RSP_R3;
+ cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
for (i = 100; i; i--) {
err = mmc_wait_for_cmd(host, &cmd, 0);
cmd.opcode = SD_APP_OP_COND;
cmd.arg = ocr;
- cmd.flags = MMC_RSP_R3;
+ cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
for (i = 100; i; i--) {
err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
cmd.opcode = MMC_ALL_SEND_CID;
cmd.arg = 0;
- cmd.flags = MMC_RSP_R2;
+ cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err == MMC_ERR_TIMEOUT) {
cmd.opcode = SD_SEND_RELATIVE_ADDR;
cmd.arg = 0;
- cmd.flags = MMC_RSP_R1;
+ cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err != MMC_ERR_NONE)
} else {
cmd.opcode = MMC_SET_RELATIVE_ADDR;
cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err != MMC_ERR_NONE)
cmd.opcode = MMC_SEND_CSD;
cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R2;
+ cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err != MMC_ERR_NONE) {
}
}
+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 unsigned int mmc_calculate_clock(struct mmc_host *host)
{
struct mmc_card *card;
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);
+ pr_debug("%s: selected %d.%03dMHz transfer rate\n",
+ mmc_hostname(host),
+ max_dtr / 1000000, (max_dtr / 1000) % 1000);
return max_dtr;
}
cmd.opcode = MMC_SEND_STATUS;
cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err == MMC_ERR_NONE)
} else {
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.clock = host->f_min;
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
/*
* We should remember the OCR mask from the existing
* Ok, now switch to push-pull mode.
*/
host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
mmc_read_csds(host);
+
+ if (host->mode == MMC_MODE_SD)
+ mmc_read_scrs(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)
+void mmc_detect_change(struct mmc_host *host, unsigned long delay)
{
- schedule_work(&host->detect);
+ mmc_schedule_delayed_work(&host->detect, delay);
}
EXPORT_SYMBOL(mmc_detect_change);
-static void mmc_rescan(void *data)
+static void mmc_rescan(struct work_struct *work)
{
- struct mmc_host *host = data;
+ 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);
- if (host->ios.power_mode == MMC_POWER_ON)
+ /*
+ * 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);
- host->ops->set_ios(host, &host->ios);
+ mmc_set_ios(host);
}
mmc_release_host(host);
spin_lock_init(&host->lock);
init_waitqueue_head(&host->wq);
INIT_LIST_HEAD(&host->cards);
- INIT_WORK(&host->detect, mmc_rescan, host);
+ INIT_DELAYED_WORK(&host->detect, mmc_rescan);
/*
* By default, hosts do not support SGIO or large requests.
ret = mmc_add_host_sysfs(host);
if (ret == 0) {
mmc_power_off(host);
- mmc_detect_change(host);
+ mmc_detect_change(host, 0);
}
return ret;
*/
void mmc_free_host(struct mmc_host *host)
{
- flush_scheduled_work();
+ mmc_flush_scheduled_work();
mmc_free_host_sysfs(host);
}
*/
int mmc_resume_host(struct mmc_host *host)
{
- mmc_detect_change(host);
+ mmc_rescan(&host->detect.work);
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff