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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>
This commit is contained in:
Kevin Liu
Chris Ball
parent
0797e5f145
commit
20b92a30b5
1 changed files with 87 additions and 123 deletions
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@ -1615,120 +1615,11 @@ static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
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spin_unlock_irqrestore(&host->lock, flags);
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}
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static int sdhci_do_3_3v_signal_voltage_switch(struct sdhci_host *host,
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u16 ctrl)
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{
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int ret;
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/* Set 1.8V Signal Enable in the Host Control2 register to 0 */
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ctrl &= ~SDHCI_CTRL_VDD_180;
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sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
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if (host->vqmmc) {
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ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
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if (ret) {
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pr_warning("%s: Switching to 3.3V signalling voltage "
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" failed\n", mmc_hostname(host->mmc));
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return -EIO;
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}
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}
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/* Wait for 5ms */
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usleep_range(5000, 5500);
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/* 3.3V regulator output should be stable within 5 ms */
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ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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if (!(ctrl & SDHCI_CTRL_VDD_180))
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return 0;
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pr_warning("%s: 3.3V regulator output did not became stable\n",
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mmc_hostname(host->mmc));
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return -EIO;
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}
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static int sdhci_do_1_8v_signal_voltage_switch(struct sdhci_host *host,
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u16 ctrl)
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{
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u8 pwr;
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u16 clk;
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u32 present_state;
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int ret;
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/* Stop SDCLK */
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clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
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clk &= ~SDHCI_CLOCK_CARD_EN;
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sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
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/* Check whether DAT[3:0] is 0000 */
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present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
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if (!((present_state & SDHCI_DATA_LVL_MASK) >>
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SDHCI_DATA_LVL_SHIFT)) {
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/*
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* Enable 1.8V Signal Enable in the Host Control2
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* register
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*/
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if (host->vqmmc)
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ret = regulator_set_voltage(host->vqmmc,
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1700000, 1950000);
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else
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ret = 0;
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if (!ret) {
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ctrl |= SDHCI_CTRL_VDD_180;
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sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
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/* Wait for 5ms */
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usleep_range(5000, 5500);
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ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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if (ctrl & SDHCI_CTRL_VDD_180) {
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/* Provide SDCLK again and wait for 1ms */
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clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
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clk |= SDHCI_CLOCK_CARD_EN;
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sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
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usleep_range(1000, 1500);
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/*
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* If DAT[3:0] level is 1111b, then the card
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* was successfully switched to 1.8V signaling.
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*/
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present_state = sdhci_readl(host,
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SDHCI_PRESENT_STATE);
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if ((present_state & SDHCI_DATA_LVL_MASK) ==
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SDHCI_DATA_LVL_MASK)
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return 0;
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}
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}
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}
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/*
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* If we are here, that means the switch to 1.8V signaling
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* failed. We power cycle the card, and retry initialization
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* sequence by setting S18R to 0.
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*/
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pwr = sdhci_readb(host, SDHCI_POWER_CONTROL);
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pwr &= ~SDHCI_POWER_ON;
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sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
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if (host->vmmc)
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regulator_disable(host->vmmc);
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/* Wait for 1ms as per the spec */
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usleep_range(1000, 1500);
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pwr |= SDHCI_POWER_ON;
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sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
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if (host->vmmc)
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regulator_enable(host->vmmc);
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pr_warning("%s: Switching to 1.8V signalling voltage failed, "
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"retrying with S18R set to 0\n", mmc_hostname(host->mmc));
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return -EAGAIN;
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}
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static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
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struct mmc_ios *ios)
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int signal_voltage)
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{
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u16 ctrl;
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int ret;
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/*
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* Signal Voltage Switching is only applicable for Host Controllers
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@ -1737,23 +1628,82 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host,
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if (host->version < SDHCI_SPEC_300)
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return 0;
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/*
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* We first check whether the request is to set signalling voltage
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* to 3.3V. If so, we change the voltage to 3.3V and return quickly.
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*/
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ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
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return sdhci_do_3_3v_signal_voltage_switch(host, ctrl);
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else if (!(ctrl & SDHCI_CTRL_VDD_180) &&
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(ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180))
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return sdhci_do_1_8v_signal_voltage_switch(host, ctrl);
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else
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switch (signal_voltage) {
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case MMC_SIGNAL_VOLTAGE_330:
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/* Set 1.8V Signal Enable in the Host Control2 register to 0 */
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ctrl &= ~SDHCI_CTRL_VDD_180;
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sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
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if (host->vqmmc) {
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ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
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if (ret) {
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pr_warning("%s: Switching to 3.3V signalling voltage "
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" failed\n", mmc_hostname(host->mmc));
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return -EIO;
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}
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}
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/* Wait for 5ms */
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usleep_range(5000, 5500);
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/* 3.3V regulator output should be stable within 5 ms */
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ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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if (!(ctrl & SDHCI_CTRL_VDD_180))
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return 0;
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pr_warning("%s: 3.3V regulator output did not became stable\n",
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mmc_hostname(host->mmc));
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return -EAGAIN;
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case MMC_SIGNAL_VOLTAGE_180:
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if (host->vqmmc) {
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ret = regulator_set_voltage(host->vqmmc,
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1700000, 1950000);
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if (ret) {
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pr_warning("%s: Switching to 1.8V signalling voltage "
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" failed\n", mmc_hostname(host->mmc));
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return -EIO;
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}
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}
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/*
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* Enable 1.8V Signal Enable in the Host Control2
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* register
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*/
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ctrl |= SDHCI_CTRL_VDD_180;
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sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
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/* Wait for 5ms */
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usleep_range(5000, 5500);
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/* 1.8V regulator output should be stable within 5 ms */
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ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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if (ctrl & SDHCI_CTRL_VDD_180)
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return 0;
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pr_warning("%s: 1.8V regulator output did not became stable\n",
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mmc_hostname(host->mmc));
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return -EAGAIN;
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case MMC_SIGNAL_VOLTAGE_120:
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if (host->vqmmc) {
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ret = regulator_set_voltage(host->vqmmc, 1100000, 1300000);
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if (ret) {
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pr_warning("%s: Switching to 1.2V signalling voltage "
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" failed\n", mmc_hostname(host->mmc));
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return -EIO;
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}
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}
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return 0;
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default:
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/* No signal voltage switch required */
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return 0;
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}
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}
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static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
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struct mmc_ios *ios)
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int signal_voltage)
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{
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struct sdhci_host *host = mmc_priv(mmc);
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int err;
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@ -1761,11 +1711,24 @@ static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
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if (host->version < SDHCI_SPEC_300)
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return 0;
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sdhci_runtime_pm_get(host);
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err = sdhci_do_start_signal_voltage_switch(host, ios);
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err = sdhci_do_start_signal_voltage_switch(host, signal_voltage);
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sdhci_runtime_pm_put(host);
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return err;
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}
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static int sdhci_card_busy(struct mmc_host *mmc)
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{
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struct sdhci_host *host = mmc_priv(mmc);
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u32 present_state;
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sdhci_runtime_pm_get(host);
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/* Check whether DAT[3:0] is 0000 */
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present_state = sdhci_readl(host, SDHCI_PRESENT_STATE);
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sdhci_runtime_pm_put(host);
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return !(present_state & SDHCI_DATA_LVL_MASK);
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}
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static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
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{
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struct sdhci_host *host;
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@ -2036,6 +1999,7 @@ static const struct mmc_host_ops sdhci_ops = {
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.execute_tuning = sdhci_execute_tuning,
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.enable_preset_value = sdhci_enable_preset_value,
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.card_event = sdhci_card_event,
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.card_busy = sdhci_card_busy,
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};
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/*****************************************************************************\
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