summaryrefslogtreecommitdiffstats
path: root/drivers/mmc
diff options
context:
space:
mode:
authorKevin Liu <kliu5@marvell.com>2012-12-17 19:29:26 +0800
committerChris Ball <cjb@laptop.org>2013-02-24 14:37:09 -0500
commit20b92a30b5610a5222060417961bc4ccb42ea5a5 (patch)
tree53672837a479970a0db28626907aaa0ff7250522 /drivers/mmc
parent0797e5f1453b2bedc08bbcbea0ea4fbe20350823 (diff)
mmc: sdhci: update signal voltage switch code
The protocol related code is moved to core stack. So update the host driver accordingly. Signed-off-by: Kevin Liu <kliu5@marvell.com> Tested-by: Tim Wang <wangtt@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c192
1 files changed, 78 insertions, 114 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3bb9b88772c..efb11268478 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1615,145 +1615,95 @@ static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
spin_unlock_irqrestore(&host->lock, flags);
}
-static int sdhci_do_3_3v_signal_voltage_switch(struct sdhci_host *host,
- u16 ctrl)
+static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
+ int signal_voltage)
{
+ u16 ctrl;
int ret;
- /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
- ctrl &= ~SDHCI_CTRL_VDD_180;
- sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
-
- if (host->vqmmc) {
- ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
- if (ret) {
- pr_warning("%s: Switching to 3.3V signalling voltage "
- " failed\n", mmc_hostname(host->mmc));
- return -EIO;
- }
- }
- /* Wait for 5ms */
- usleep_range(5000, 5500);
+ /*
+ * Signal Voltage Switching is only applicable for Host Controllers
+ * v3.00 and above.
+ */
+ if (host->version < SDHCI_SPEC_300)
+ return 0;
- /* 3.3V regulator output should be stable within 5 ms */
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
- if (!(ctrl & SDHCI_CTRL_VDD_180))
- return 0;
- pr_warning("%s: 3.3V regulator output did not became stable\n",
- mmc_hostname(host->mmc));
+ switch (signal_voltage) {
+ case MMC_SIGNAL_VOLTAGE_330:
+ /* Set 1.8V Signal Enable in the Host Control2 register to 0 */
+ ctrl &= ~SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
- return -EIO;
-}
+ if (host->vqmmc) {
+ ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
+ if (ret) {
+ pr_warning("%s: Switching to 3.3V signalling voltage "
+ " failed\n", mmc_hostname(host->mmc));
+ return -EIO;
+ }
+ }
+ /* Wait for 5ms */
+ usleep_range(5000, 5500);
-static int sdhci_do_1_8v_signal_voltage_switch(struct sdhci_host *host,
- u16 ctrl)
-{
- u8 pwr;
- u16 clk;
- u32 present_state;
- int ret;
+ /* 3.3V regulator output should be stable within 5 ms */
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (!(ctrl & SDHCI_CTRL_VDD_180))
+ return 0;
- /* Stop SDCLK */
- clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
- clk &= ~SDHCI_CLOCK_CARD_EN;
- sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+ pr_warning("%s: 3.3V regulator output did not became stable\n",
+ mmc_hostname(host->mmc));
+
+ return -EAGAIN;
+ case MMC_SIGNAL_VOLTAGE_180:
+ if (host->vqmmc) {
+ ret = regulator_set_voltage(host->vqmmc,
+ 1700000, 1950000);
+ if (ret) {
+ pr_warning("%s: Switching to 1.8V signalling voltage "
+ " failed\n", mmc_hostname(host->mmc));
+ return -EIO;
+ }
+ }
- /* Check whether DAT[3:0] is 0000 */
- present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
- if (!((present_state & SDHCI_DATA_LVL_MASK) >>
- SDHCI_DATA_LVL_SHIFT)) {
/*
* Enable 1.8V Signal Enable in the Host Control2
* register
*/
- if (host->vqmmc)
- ret = regulator_set_voltage(host->vqmmc,
- 1700000, 1950000);
- else
- ret = 0;
+ ctrl |= SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
- if (!ret) {
- ctrl |= SDHCI_CTRL_VDD_180;
- sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ /* Wait for 5ms */
+ usleep_range(5000, 5500);
- /* Wait for 5ms */
- usleep_range(5000, 5500);
+ /* 1.8V regulator output should be stable within 5 ms */
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ if (ctrl & SDHCI_CTRL_VDD_180)
+ return 0;
- ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
- if (ctrl & SDHCI_CTRL_VDD_180) {
- /* Provide SDCLK again and wait for 1ms */
- clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
- clk |= SDHCI_CLOCK_CARD_EN;
- sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
- usleep_range(1000, 1500);
+ pr_warning("%s: 1.8V regulator output did not became stable\n",
+ mmc_hostname(host->mmc));
- /*
- * If DAT[3:0] level is 1111b, then the card
- * was successfully switched to 1.8V signaling.
- */
- present_state = sdhci_readl(host,
- SDHCI_PRESENT_STATE);
- if ((present_state & SDHCI_DATA_LVL_MASK) ==
- SDHCI_DATA_LVL_MASK)
- return 0;
+ return -EAGAIN;
+ case MMC_SIGNAL_VOLTAGE_120:
+ if (host->vqmmc) {
+ ret = regulator_set_voltage(host->vqmmc, 1100000, 1300000);
+ if (ret) {
+ pr_warning("%s: Switching to 1.2V signalling voltage "
+ " failed\n", mmc_hostname(host->mmc));
+ return -EIO;
}
}
- }
-
- /*
- * If we are here, that means the switch to 1.8V signaling
- * failed. We power cycle the card, and retry initialization
- * sequence by setting S18R to 0.
- */
- pwr = sdhci_readb(host, SDHCI_POWER_CONTROL);
- pwr &= ~SDHCI_POWER_ON;
- sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
- if (host->vmmc)
- regulator_disable(host->vmmc);
-
- /* Wait for 1ms as per the spec */
- usleep_range(1000, 1500);
- pwr |= SDHCI_POWER_ON;
- sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
- if (host->vmmc)
- regulator_enable(host->vmmc);
-
- pr_warning("%s: Switching to 1.8V signalling voltage failed, "
- "retrying with S18R set to 0\n", mmc_hostname(host->mmc));
-
- return -EAGAIN;
-}
-
-static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
- struct mmc_ios *ios)
-{
- u16 ctrl;
-
- /*
- * Signal Voltage Switching is only applicable for Host Controllers
- * v3.00 and above.
- */
- if (host->version < SDHCI_SPEC_300)
return 0;
-
- /*
- * We first check whether the request is to set signalling voltage
- * to 3.3V. If so, we change the voltage to 3.3V and return quickly.
- */
- ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
- if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
- return sdhci_do_3_3v_signal_voltage_switch(host, ctrl);
- else if (!(ctrl & SDHCI_CTRL_VDD_180) &&
- (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180))
- return sdhci_do_1_8v_signal_voltage_switch(host, ctrl);
- else
+ default:
/* No signal voltage switch required */
return 0;
+ }
}
static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
- struct mmc_ios *ios)
+ int signal_voltage)
{
struct sdhci_host *host = mmc_priv(mmc);
int err;
@@ -1761,11 +1711,24 @@ static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
if (host->version < SDHCI_SPEC_300)
return 0;
sdhci_runtime_pm_get(host);
- err = sdhci_do_start_signal_voltage_switch(host, ios);
+ err = sdhci_do_start_signal_voltage_switch(host, signal_voltage);
sdhci_runtime_pm_put(host);
return err;
}
+static int sdhci_card_busy(struct mmc_host *mmc)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ u32 present_state;
+
+ sdhci_runtime_pm_get(host);
+ /* Check whether DAT[3:0] is 0000 */
+ present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
+ sdhci_runtime_pm_put(host);
+
+ return !(present_state & SDHCI_DATA_LVL_MASK);
+}
+
static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host;
@@ -2036,6 +1999,7 @@ static const struct mmc_host_ops sdhci_ops = {
.execute_tuning = sdhci_execute_tuning,
.enable_preset_value = sdhci_enable_preset_value,
.card_event = sdhci_card_event,
+ .card_busy = sdhci_card_busy,
};
/*****************************************************************************\