#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
-#include <linux/mmc/protocol.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
#include "core.h"
+#include "bus.h"
+#include "host.h"
-#define CMD_RETRIES 3
+#include "mmc_ops.h"
+#include "sd_ops.h"
+#include "sdio_ops.h"
-/*
- * 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,
-};
+extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
+extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
+extern int mmc_attach_sdio(struct mmc_host *host, u32 ocr);
-static const unsigned int tacc_exp[] = {
- 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
-};
+static struct workqueue_struct *workqueue;
-static const unsigned int tacc_mant[] = {
- 0, 10, 12, 13, 15, 20, 25, 30,
- 35, 40, 45, 50, 55, 60, 70, 80,
-};
+/*
+ * Internal function. Schedule delayed work in the MMC work queue.
+ */
+static int mmc_schedule_delayed_work(struct delayed_work *work,
+ unsigned long delay)
+{
+ return queue_delayed_work(workqueue, work, delay);
+}
+/*
+ * Internal function. Flush all scheduled work from the MMC work queue.
+ */
+static void mmc_flush_scheduled_work(void)
+{
+ flush_workqueue(workqueue);
+}
/**
* mmc_request_done - finish processing an MMC request
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) {
+ pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
+ mmc_hostname(host), cmd->opcode, err);
+
cmd->retries--;
cmd->error = 0;
host->ops->request(host, mrq);
- } else if (mrq->done) {
- mrq->done(mrq);
+ } else {
+ pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
+ mmc_hostname(host), cmd->opcode, err,
+ cmd->resp[0], cmd->resp[1],
+ cmd->resp[2], cmd->resp[3]);
+
+ if (mrq->data) {
+ pr_debug("%s: %d bytes transferred: %d\n",
+ mmc_hostname(host),
+ mrq->data->bytes_xfered, mrq->data->error);
+ }
+
+ if (mrq->stop) {
+ pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
+ mmc_hostname(host), mrq->stop->opcode,
+ mrq->stop->error,
+ mrq->stop->resp[0], mrq->stop->resp[1],
+ mrq->stop->resp[2], mrq->stop->resp[3]);
+ }
+
+ 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
+static void
mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
{
#ifdef CONFIG_MMC_DEBUG
mmc_hostname(host), mrq->cmd->opcode,
mrq->cmd->arg, mrq->cmd->flags);
+ if (mrq->data) {
+ pr_debug("%s: blksz %d blocks %d flags %08x "
+ "tsac %d ms nsac %d\n",
+ mmc_hostname(host), mrq->data->blksz,
+ mrq->data->blocks, mrq->data->flags,
+ mrq->data->timeout_ns / 10000000,
+ mrq->data->timeout_clks);
+ }
+
+ if (mrq->stop) {
+ pr_debug("%s: CMD%u arg %08x flags %08x\n",
+ mmc_hostname(host), mrq->stop->opcode,
+ mrq->stop->arg, mrq->stop->flags);
+ }
+
WARN_ON(!host->claimed);
mrq->cmd->error = 0;
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)
+/**
+ * mmc_wait_for_req - start a request and wait for completion
+ * @host: MMC host to start command
+ * @mrq: MMC request to start
+ *
+ * Start a new MMC custom command request for a host, and wait
+ * for the command to complete. Does not attempt to parse the
+ * response.
+ */
+void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
{
DECLARE_COMPLETION_ONSTACK(complete);
mmc_start_request(host, mrq);
wait_for_completion(&complete);
-
- return 0;
}
EXPORT_SYMBOL(mmc_wait_for_req);
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
+ *
+ * Computes the data timeout parameters according to the
+ * correct algorithm given the card type.
*/
-void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
- int write)
+void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
{
unsigned int mult;
* Scale up the multiplier (and therefore the timeout) by
* the r2w factor for writes.
*/
- if (write)
+ if (data->flags & MMC_DATA_WRITE)
mult <<= card->csd.r2w_factor;
data->timeout_ns = card->csd.tacc_ns * mult;
timeout_us += data->timeout_clks * 1000 /
(card->host->ios.clock / 1000);
- if (write)
+ if (data->flags & MMC_DATA_WRITE)
limit_us = 250000;
else
limit_us = 100000;
EXPORT_SYMBOL(mmc_set_data_timeout);
/**
- * __mmc_claim_host - exclusively claim a host
+ * 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.
+ * Claim a host for a set of operations.
*/
void mmc_claim_host(struct mmc_host *host)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
+ might_sleep();
+
add_wait_queue(&host->wq, &wait);
spin_lock_irqsave(&host->lock, flags);
while (1) {
EXPORT_SYMBOL(mmc_release_host);
+/*
+ * Internal function that does the actual ios call to the host driver,
+ * optionally printing some debug output.
+ */
static inline void mmc_set_ios(struct mmc_host *host)
{
struct mmc_ios *ios = &host->ios;
host->ops->set_ios(host, ios);
}
-static int mmc_select_card(struct mmc_card *card)
+/*
+ * Control chip select pin on a host.
+ */
+void mmc_set_chip_select(struct mmc_host *host, int mode)
{
- int err;
- struct mmc_command cmd;
-
- BUG_ON(!card->host->claimed);
-
- cmd.opcode = MMC_SELECT_CARD;
- cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ host->ios.chip_select = mode;
+ mmc_set_ios(host);
+}
- err = mmc_wait_for_cmd(card->host, &cmd, CMD_RETRIES);
- if (err != MMC_ERR_NONE)
- return err;
+/*
+ * Sets the host clock to the highest possible frequency that
+ * is below "hz".
+ */
+void mmc_set_clock(struct mmc_host *host, unsigned int hz)
+{
+ WARN_ON(hz < host->f_min);
- /*
- * 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) &&
- (card->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(card->host, card->rca,
- &cmd, CMD_RETRIES);
- if (err != MMC_ERR_NONE)
- return err;
-
- card->host->ios.bus_width = MMC_BUS_WIDTH_4;
- mmc_set_ios(card->host);
- }
+ if (hz > host->f_max)
+ hz = host->f_max;
- return MMC_ERR_NONE;
+ host->ios.clock = hz;
+ mmc_set_ios(host);
}
+/*
+ * Change the bus mode (open drain/push-pull) of a host.
+ */
+void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
+{
+ host->ios.bus_mode = mode;
+ mmc_set_ios(host);
+}
-static inline void mmc_delay(unsigned int ms)
+/*
+ * Change data bus width of a host.
+ */
+void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
{
- if (ms < 1000 / HZ) {
- cond_resched();
- mdelay(ms);
- } else {
- msleep(ms);
- }
+ host->ios.bus_width = width;
+ mmc_set_ios(host);
}
/*
* Mask off any voltages we don't support and select
* the lowest voltage
*/
-static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
+u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
{
int bit;
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.
+ * Select timing parameters for host.
*/
-static void mmc_decode_scr(struct mmc_card *card)
+void mmc_set_timing(struct mmc_host *host, unsigned int timing)
{
- 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);
-}
-
-/*
- * Allocate a new MMC card
- */
-static struct mmc_card *
-mmc_alloc_card(struct mmc_host *host, u32 *raw_cid)
-{
- struct mmc_card *card;
-
- 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));
-
- 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;
+ host->ios.timing = timing;
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);
}
/*
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 the card by requesting its CID.
- *
- * Create a mmc_card entry for the discovered card, assigning
- * it an RCA, and save the raw CID for decoding later.
+ * Cleanup when the last reference to the bus operator is dropped.
*/
-static void mmc_discover_card(struct mmc_host *host)
+void __mmc_release_bus(struct mmc_host *host)
{
- unsigned int err;
-
- struct mmc_command cmd;
-
- BUG_ON(host->card);
+ BUG_ON(!host);
+ BUG_ON(host->bus_refs);
+ BUG_ON(!host->bus_dead);
- 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;
- return;
- }
- if (err != MMC_ERR_NONE) {
- printk(KERN_ERR "%s: error requesting CID: %d\n",
- mmc_hostname(host), err);
- return;
- }
-
- host->card = mmc_alloc_card(host, cmd.resp);
- if (IS_ERR(host->card)) {
- err = PTR_ERR(host->card);
- host->card = NULL;
- return;
- }
-
- if (host->mode == MMC_MODE_SD) {
- host->card->type = MMC_TYPE_SD;
-
- 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(host->card);
- else {
- host->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(host->card);
- }
- }
- } else {
- host->card->type = MMC_TYPE_MMC;
- host->card->rca = 1;
-
- cmd.opcode = MMC_SET_RELATIVE_ADDR;
- cmd.arg = host->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(host->card);
- }
+ host->bus_ops = NULL;
}
-static void mmc_read_csd(struct mmc_host *host)
-{
- struct mmc_command cmd;
- int err;
-
- if (!host->card)
- return;
- if (mmc_card_dead(host->card))
- return;
-
- cmd.opcode = MMC_SEND_CSD;
- cmd.arg = host->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(host->card);
- return;
- }
-
- memcpy(host->card->raw_csd, cmd.resp, sizeof(host->card->raw_csd));
-
- mmc_decode_csd(host->card);
- mmc_decode_cid(host->card);
-}
-
-static void mmc_process_ext_csd(struct mmc_host *host)
+/*
+ * Increase reference count of bus operator
+ */
+static inline void mmc_bus_get(struct mmc_host *host)
{
- int err;
-
- struct mmc_request mrq;
- struct mmc_command cmd;
- struct mmc_data data;
-
- u8 *ext_csd;
- struct scatterlist sg;
-
- if (!host->card)
- return;
- if (mmc_card_dead(host->card))
- return;
- if (mmc_card_sd(host->card))
- return;
- if (host->card->csd.mmca_vsn < CSD_SPEC_VER_4)
- return;
-
- /*
- * As the ext_csd is so large and mostly unused, we don't store the
- * raw block in mmc_card.
- */
- 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;
- }
-
- 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, host->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) {
- if (host->card->csd.capacity == (4096 * 512)) {
- printk(KERN_ERR "%s: unable to read EXT_CSD "
- "on a possible high capacity card. "
- "Card will be ignored.\n",
- mmc_hostname(host));
- mmc_card_set_dead(host->card);
- } else {
- printk(KERN_WARNING "%s: unable to read "
- "EXT_CSD, performance might "
- "suffer.\n",
- mmc_hostname(host));
- }
- goto out;
- }
-
- host->card->ext_csd.sectors =
- ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
- ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
- ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
- ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
- if (host->card->ext_csd.sectors)
- mmc_card_set_blockaddr(host->card);
-
- switch (ext_csd[EXT_CSD_CARD_TYPE]) {
- case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
- host->card->ext_csd.hs_max_dtr = 52000000;
- break;
- case EXT_CSD_CARD_TYPE_26:
- host->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(host));
- goto out;
- }
-
- 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(host));
- goto out;
- }
-
- mmc_card_set_highspeed(host->card);
-
- host->ios.timing = MMC_TIMING_MMC_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(host));
- goto out;
- }
-
- host->ios.bus_width = MMC_BUS_WIDTH_4;
- mmc_set_ios(host);
- }
+ unsigned long flags;
-out:
- kfree(ext_csd);
+ spin_lock_irqsave(&host->lock, flags);
+ host->bus_refs++;
+ spin_unlock_irqrestore(&host->lock, flags);
}
-static void mmc_read_scr(struct mmc_host *host)
+/*
+ * Decrease reference count of bus operator and free it if
+ * it is the last reference.
+ */
+static inline void mmc_bus_put(struct mmc_host *host)
{
- int err;
- struct mmc_request mrq;
- struct mmc_command cmd;
- struct mmc_data data;
- struct scatterlist sg;
-
- if (!host->card)
- return;
- if (mmc_card_dead(host->card))
- return;
- if (!mmc_card_sd(host->card))
- return;
-
- memset(&cmd, 0, sizeof(struct mmc_command));
-
- cmd.opcode = MMC_APP_CMD;
- cmd.arg = host->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(host->card);
- return;
- }
-
- 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, host->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*)host->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(host->card);
- return;
- }
-
- host->card->raw_scr[0] = ntohl(host->card->raw_scr[0]);
- host->card->raw_scr[1] = ntohl(host->card->raw_scr[1]);
+ unsigned long flags;
- mmc_decode_scr(host->card);
+ spin_lock_irqsave(&host->lock, flags);
+ host->bus_refs--;
+ if ((host->bus_refs == 0) && host->bus_ops)
+ __mmc_release_bus(host);
+ spin_unlock_irqrestore(&host->lock, flags);
}
-static void mmc_read_switch_caps(struct mmc_host *host)
+/*
+ * Assign a mmc bus handler to a host. Only one bus handler may control a
+ * host at any given time.
+ */
+void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
{
- 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;
-
- if (!host->card)
- return;
- if (mmc_card_dead(host->card))
- return;
- if (!mmc_card_sd(host->card))
- return;
- if (host->card->scr.sda_vsn < SCR_SPEC_VER_1)
- 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;
- }
-
- 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, host->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(host));
- goto out;
- }
-
- if (status[13] & 0x02)
- host->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, host->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));
- goto out;
- }
+ unsigned long flags;
- mmc_card_set_highspeed(host->card);
+ BUG_ON(!host);
+ BUG_ON(!ops);
- host->ios.timing = MMC_TIMING_SD_HS;
- mmc_set_ios(host);
+ BUG_ON(!host->claimed);
-out:
- kfree(status);
-}
+ spin_lock_irqsave(&host->lock, flags);
-static unsigned int mmc_calculate_clock(struct mmc_host *host)
-{
- unsigned int max_dtr = host->f_max;
-
- if (host->card && !mmc_card_dead(host->card)) {
- if (mmc_card_highspeed(host->card) && mmc_card_sd(host->card)) {
- if (max_dtr > host->card->sw_caps.hs_max_dtr)
- max_dtr = host->card->sw_caps.hs_max_dtr;
- } else if (mmc_card_highspeed(host->card) && !mmc_card_sd(host->card)) {
- if (max_dtr > host->card->ext_csd.hs_max_dtr)
- max_dtr = host->card->ext_csd.hs_max_dtr;
- } else if (max_dtr > host->card->csd.max_dtr) {
- max_dtr = host->card->csd.max_dtr;
- }
- }
+ BUG_ON(host->bus_ops);
+ BUG_ON(host->bus_refs);
- pr_debug("%s: selected %d.%03dMHz transfer rate\n",
- mmc_hostname(host),
- max_dtr / 1000000, (max_dtr / 1000) % 1000);
+ host->bus_ops = ops;
+ host->bus_refs = 1;
+ host->bus_dead = 0;
- return max_dtr;
+ spin_unlock_irqrestore(&host->lock, flags);
}
/*
- * 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.
+ * Remove the current bus handler from a host. Assumes that there are
+ * no interesting cards left, so the bus is powered down.
*/
-static void mmc_check_card(struct mmc_card *card)
-{
- struct mmc_command cmd;
- int err;
-
- BUG_ON(!card);
-
- cmd.opcode = MMC_SEND_STATUS;
- cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
-
- err = mmc_wait_for_cmd(card->host, &cmd, CMD_RETRIES);
- if (err == MMC_ERR_NONE)
- return;
-
- mmc_card_set_dead(card);
-}
-
-static void mmc_setup(struct mmc_host *host)
+void mmc_detach_bus(struct mmc_host *host)
{
- 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);
-
- if (host->ocr == 0)
- return;
+ unsigned long flags;
- /*
- * Since we're changing the OCR value, we seem to
- * need to tell some cards to go back to the idle
- * state. We wait 1ms to give cards time to
- * respond.
- */
- mmc_idle_cards(host);
+ BUG_ON(!host);
- /*
- * 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 {
- /* The extra bit indicates that we support high capacity */
- mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
- }
+ BUG_ON(!host->claimed);
+ BUG_ON(!host->bus_ops);
- mmc_discover_card(host);
+ spin_lock_irqsave(&host->lock, flags);
- /*
- * Ok, now switch to push-pull mode.
- */
- host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
- mmc_set_ios(host);
+ host->bus_dead = 1;
- mmc_read_csd(host);
+ spin_unlock_irqrestore(&host->lock, flags);
- if (host->card && !mmc_card_dead(host->card)) {
- err = mmc_select_card(host->card);
- if (err != MMC_ERR_NONE)
- mmc_card_set_dead(host->card);
- }
+ mmc_power_off(host);
- if (host->mode == MMC_MODE_SD) {
- mmc_read_scr(host);
- mmc_read_switch_caps(host);
- } else
- mmc_process_ext_csd(host);
+ mmc_bus_put(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.
+ * MMC drivers should call this when they detect a card has been
+ * inserted or removed. The MMC layer will confirm that any
+ * present card is still functional, and initialize any newly
+ * inserted.
*/
void mmc_detect_change(struct mmc_host *host, unsigned long delay)
{
#ifdef CONFIG_MMC_DEBUG
- mmc_claim_host(host);
+ unsigned long flags;
+ spin_lock_irqsave(&host->lock, flags);
BUG_ON(host->removed);
- mmc_release_host(host);
+ spin_unlock_irqrestore(&host->lock, flags);
#endif
mmc_schedule_delayed_work(&host->detect, delay);
EXPORT_SYMBOL(mmc_detect_change);
-static void mmc_rescan(struct work_struct *work)
+void mmc_rescan(struct work_struct *work)
{
struct mmc_host *host =
container_of(work, struct mmc_host, detect.work);
+ u32 ocr;
+ int err;
- mmc_claim_host(host);
-
- /*
- * Check for removed card and newly inserted ones. We check for
- * removed cards first so we can intelligently re-select the VDD.
- */
- if (host->card) {
- mmc_check_card(host->card);
-
- mmc_release_host(host);
-
- if (mmc_card_dead(host->card)) {
- mmc_remove_card(host->card);
- host->card = NULL;
- }
-
- goto out;
- }
-
- mmc_setup(host);
+ mmc_bus_get(host);
- if (host->card && !mmc_card_dead(host->card)) {
+ if (host->bus_ops == NULL) {
/*
- * (Re-)calculate the fastest clock rate which the
- * attached cards and the host support.
+ * Only we can add a new handler, so it's safe to
+ * release the lock here.
*/
- host->ios.clock = mmc_calculate_clock(host);
- mmc_set_ios(host);
- }
+ mmc_bus_put(host);
- mmc_release_host(host);
+ mmc_claim_host(host);
- /*
- * If this is a new and good card, register it.
- */
- if (host->card && !mmc_card_dead(host->card)) {
- if (mmc_register_card(host->card))
- mmc_card_set_dead(host->card);
- }
+ mmc_power_up(host);
+ mmc_go_idle(host);
- /*
- * If this card is dead, destroy it.
- */
- if (host->card && mmc_card_dead(host->card)) {
- mmc_remove_card(host->card);
- host->card = NULL;
- }
+ mmc_send_if_cond(host, host->ocr_avail);
-out:
- /*
- * If we discover that there are no cards on the
- * bus, turn off the clock and power down.
- */
- if (!host->card)
- 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;
+ /*
+ * First we search for SDIO...
+ */
+ err = mmc_send_io_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_sdio(host, ocr))
+ mmc_power_off(host);
+ return;
+ }
- host = mmc_alloc_host_sysfs(extra, dev);
- if (host) {
- spin_lock_init(&host->lock);
- init_waitqueue_head(&host->wq);
- INIT_DELAYED_WORK(&host->detect, mmc_rescan);
+ /*
+ * ...then normal SD...
+ */
+ err = mmc_send_app_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_sd(host, ocr))
+ mmc_power_off(host);
+ return;
+ }
/*
- * By default, hosts do not support SGIO or large requests.
- * They have to set these according to their abilities.
+ * ...and finally MMC.
*/
- host->max_hw_segs = 1;
- host->max_phys_segs = 1;
- host->max_seg_size = PAGE_CACHE_SIZE;
+ err = mmc_send_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_mmc(host, ocr))
+ mmc_power_off(host);
+ return;
+ }
- host->max_req_size = PAGE_CACHE_SIZE;
- host->max_blk_size = 512;
- host->max_blk_count = PAGE_CACHE_SIZE / 512;
- }
+ mmc_release_host(host);
+ mmc_power_off(host);
+ } else {
+ if (host->bus_ops->detect && !host->bus_dead)
+ host->bus_ops->detect(host);
- return host;
+ mmc_bus_put(host);
+ }
}
-EXPORT_SYMBOL(mmc_alloc_host);
-
-/**
- * mmc_add_host - initialise host hardware
- * @host: mmc host
- */
-int mmc_add_host(struct mmc_host *host)
+void mmc_start_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;
+ mmc_power_off(host);
+ mmc_detect_change(host, 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)
+void mmc_stop_host(struct mmc_host *host)
{
#ifdef CONFIG_MMC_DEBUG
- mmc_claim_host(host);
+ unsigned long flags;
+ spin_lock_irqsave(&host->lock, flags);
host->removed = 1;
- mmc_release_host(host);
+ spin_unlock_irqrestore(&host->lock, flags);
#endif
mmc_flush_scheduled_work();
- if (host->card) {
- mmc_remove_card(host->card);
- host->card = NULL;
- }
+ mmc_bus_get(host);
+ if (host->bus_ops && !host->bus_dead) {
+ if (host->bus_ops->remove)
+ host->bus_ops->remove(host);
- mmc_power_off(host);
- mmc_remove_host_sysfs(host);
-}
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ }
+ mmc_bus_put(host);
-EXPORT_SYMBOL(mmc_remove_host);
+ BUG_ON(host->card);
-/**
- * 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_free_host_sysfs(host);
+ mmc_power_off(host);
}
-EXPORT_SYMBOL(mmc_free_host);
-
#ifdef CONFIG_PM
/**
{
mmc_flush_scheduled_work();
- if (host->card) {
- mmc_remove_card(host->card);
- host->card = NULL;
+ mmc_bus_get(host);
+ if (host->bus_ops && !host->bus_dead) {
+ if (host->bus_ops->suspend)
+ host->bus_ops->suspend(host);
+ if (!host->bus_ops->resume) {
+ if (host->bus_ops->remove)
+ host->bus_ops->remove(host);
+
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ }
}
+ mmc_bus_put(host);
mmc_power_off(host);
*/
int mmc_resume_host(struct mmc_host *host)
{
- mmc_rescan(&host->detect.work);
+ mmc_bus_get(host);
+ if (host->bus_ops && !host->bus_dead) {
+ mmc_power_up(host);
+ BUG_ON(!host->bus_ops->resume);
+ host->bus_ops->resume(host);
+ }
+ mmc_bus_put(host);
+
+ /*
+ * We add a slight delay here so that resume can progress
+ * in parallel.
+ */
+ mmc_detect_change(host, 1);
return 0;
}
#endif
+static int __init mmc_init(void)
+{
+ int ret;
+
+ workqueue = create_singlethread_workqueue("kmmcd");
+ if (!workqueue)
+ return -ENOMEM;
+
+ ret = mmc_register_bus();
+ if (ret == 0) {
+ ret = mmc_register_host_class();
+ if (ret)
+ mmc_unregister_bus();
+ }
+ return ret;
+}
+
+static void __exit mmc_exit(void)
+{
+ mmc_unregister_host_class();
+ mmc_unregister_bus();
+ destroy_workqueue(workqueue);
+}
+
+module_init(mmc_init);
+module_exit(mmc_exit);
+
MODULE_LICENSE("GPL");
projects / deliverable / linux.git / blobdiff