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path: root/drivers/mmc/core/core.c
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Diffstat (limited to 'drivers/mmc/core/core.c')
-rw-r--r--drivers/mmc/core/core.c179
1 files changed, 116 insertions, 63 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 09eee6df0653..8f86d702e46e 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -58,6 +58,7 @@ int mmc_assume_removable;
#else
int mmc_assume_removable = 1;
#endif
+EXPORT_SYMBOL(mmc_assume_removable);
module_param_named(removable, mmc_assume_removable, bool, 0644);
MODULE_PARM_DESC(
removable,
@@ -650,14 +651,24 @@ void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
}
/*
- * Change data bus width of a host.
+ * Change data bus width and DDR mode of a host.
*/
-void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
+void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width,
+ unsigned int ddr)
{
host->ios.bus_width = width;
+ host->ios.ddr = ddr;
mmc_set_ios(host);
}
+/*
+ * Change data bus width of a host.
+ */
+void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
+{
+ mmc_set_bus_width_ddr(host, width, MMC_SDR_MODE);
+}
+
/**
* mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
* @vdd: voltage (mV)
@@ -771,8 +782,9 @@ EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
/**
* mmc_regulator_set_ocr - set regulator to match host->ios voltage
- * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
+ * @mmc: the host to regulate
* @supply: regulator to use
+ * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
*
* Returns zero on success, else negative errno.
*
@@ -780,15 +792,12 @@ EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
* a particular supply voltage. This would normally be called from the
* set_ios() method.
*/
-int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit)
+int mmc_regulator_set_ocr(struct mmc_host *mmc,
+ struct regulator *supply,
+ unsigned short vdd_bit)
{
int result = 0;
int min_uV, max_uV;
- int enabled;
-
- enabled = regulator_is_enabled(supply);
- if (enabled < 0)
- return enabled;
if (vdd_bit) {
int tmp;
@@ -819,17 +828,25 @@ int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit)
else
result = 0;
- if (result == 0 && !enabled)
+ if (result == 0 && !mmc->regulator_enabled) {
result = regulator_enable(supply);
- } else if (enabled) {
+ if (!result)
+ mmc->regulator_enabled = true;
+ }
+ } else if (mmc->regulator_enabled) {
result = regulator_disable(supply);
+ if (result == 0)
+ mmc->regulator_enabled = false;
}
+ if (result)
+ dev_err(mmc_dev(mmc),
+ "could not set regulator OCR (%d)\n", result);
return result;
}
EXPORT_SYMBOL(mmc_regulator_set_ocr);
-#endif
+#endif /* CONFIG_REGULATOR */
/*
* Mask off any voltages we don't support and select
@@ -907,12 +924,7 @@ static void mmc_power_up(struct mmc_host *host)
*/
mmc_delay(10);
- if (host->f_min > 400000) {
- pr_warning("%s: Minimum clock frequency too high for "
- "identification mode\n", mmc_hostname(host));
- host->ios.clock = host->f_min;
- } else
- host->ios.clock = 400000;
+ host->ios.clock = host->f_init;
host->ios.power_mode = MMC_POWER_ON;
mmc_set_ios(host);
@@ -1397,6 +1409,21 @@ int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
}
EXPORT_SYMBOL(mmc_erase_group_aligned);
+int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
+{
+ struct mmc_command cmd;
+
+ if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
+ return 0;
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+ cmd.opcode = MMC_SET_BLOCKLEN;
+ cmd.arg = blocklen;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+ return mmc_wait_for_cmd(card->host, &cmd, 5);
+}
+EXPORT_SYMBOL(mmc_set_blocklen);
+
void mmc_rescan(struct work_struct *work)
{
struct mmc_host *host =
@@ -1404,6 +1431,8 @@ void mmc_rescan(struct work_struct *work)
u32 ocr;
int err;
unsigned long flags;
+ int i;
+ const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
spin_lock_irqsave(&host->lock, flags);
@@ -1443,55 +1472,71 @@ void mmc_rescan(struct work_struct *work)
if (host->ops->get_cd && host->ops->get_cd(host) == 0)
goto out;
- mmc_claim_host(host);
+ for (i = 0; i < ARRAY_SIZE(freqs); i++) {
+ mmc_claim_host(host);
- mmc_power_up(host);
- sdio_reset(host);
- mmc_go_idle(host);
+ if (freqs[i] >= host->f_min)
+ host->f_init = freqs[i];
+ else if (!i || freqs[i-1] > host->f_min)
+ host->f_init = host->f_min;
+ else {
+ mmc_release_host(host);
+ goto out;
+ }
+#ifdef CONFIG_MMC_DEBUG
+ pr_info("%s: %s: trying to init card at %u Hz\n",
+ mmc_hostname(host), __func__, host->f_init);
+#endif
+ mmc_power_up(host);
+ sdio_reset(host);
+ mmc_go_idle(host);
- mmc_send_if_cond(host, host->ocr_avail);
+ mmc_send_if_cond(host, host->ocr_avail);
- /*
- * First we search for SDIO...
- */
- err = mmc_send_io_op_cond(host, 0, &ocr);
- if (!err) {
- if (mmc_attach_sdio(host, ocr)) {
- mmc_claim_host(host);
- /* try SDMEM (but not MMC) even if SDIO is broken */
- if (mmc_send_app_op_cond(host, 0, &ocr))
- goto out_fail;
+ /*
+ * First we search for SDIO...
+ */
+ err = mmc_send_io_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_sdio(host, ocr)) {
+ mmc_claim_host(host);
+ /*
+ * Try SDMEM (but not MMC) even if SDIO
+ * is broken.
+ */
+ if (mmc_send_app_op_cond(host, 0, &ocr))
+ goto out_fail;
+
+ if (mmc_attach_sd(host, ocr))
+ mmc_power_off(host);
+ }
+ goto out;
+ }
+ /*
+ * ...then normal SD...
+ */
+ err = mmc_send_app_op_cond(host, 0, &ocr);
+ if (!err) {
if (mmc_attach_sd(host, ocr))
mmc_power_off(host);
+ goto out;
}
- goto out;
- }
- /*
- * ...then normal SD...
- */
- err = mmc_send_app_op_cond(host, 0, &ocr);
- if (!err) {
- if (mmc_attach_sd(host, ocr))
- mmc_power_off(host);
- goto out;
- }
-
- /*
- * ...and finally MMC.
- */
- err = mmc_send_op_cond(host, 0, &ocr);
- if (!err) {
- if (mmc_attach_mmc(host, ocr))
- mmc_power_off(host);
- goto out;
- }
+ /*
+ * ...and finally MMC.
+ */
+ err = mmc_send_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_mmc(host, ocr))
+ mmc_power_off(host);
+ goto out;
+ }
out_fail:
- mmc_release_host(host);
- mmc_power_off(host);
-
+ mmc_release_host(host);
+ mmc_power_off(host);
+ }
out:
if (host->caps & MMC_CAP_NEEDS_POLL)
mmc_schedule_delayed_work(&host->detect, HZ);
@@ -1538,37 +1583,45 @@ void mmc_stop_host(struct mmc_host *host)
mmc_power_off(host);
}
-void mmc_power_save_host(struct mmc_host *host)
+int mmc_power_save_host(struct mmc_host *host)
{
+ int ret = 0;
+
mmc_bus_get(host);
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
mmc_bus_put(host);
- return;
+ return -EINVAL;
}
if (host->bus_ops->power_save)
- host->bus_ops->power_save(host);
+ ret = host->bus_ops->power_save(host);
mmc_bus_put(host);
mmc_power_off(host);
+
+ return ret;
}
EXPORT_SYMBOL(mmc_power_save_host);
-void mmc_power_restore_host(struct mmc_host *host)
+int mmc_power_restore_host(struct mmc_host *host)
{
+ int ret;
+
mmc_bus_get(host);
if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
mmc_bus_put(host);
- return;
+ return -EINVAL;
}
mmc_power_up(host);
- host->bus_ops->power_restore(host);
+ ret = host->bus_ops->power_restore(host);
mmc_bus_put(host);
+
+ return ret;
}
EXPORT_SYMBOL(mmc_power_restore_host);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-25 08:13:36 +0000