From: Chevron Li <chevron.li@xxxxxxxxxxxxxx>
Add Bayhub new chip GG8 support for SD express card.
This patch depends on patch 1/2.
Signed-off-by: Chevron Li <chevron.li@xxxxxxxxxxxxxx>
---
Change in V1:
1.Implement the SD express card callback routine.
2.Add SD express card support for Bayhub GG8 chip.
---
drivers/mmc/host/sdhci-pci-o2micro.c | 61 +++++++++++++++++++++++++++-
1 file changed, 60 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
index 8243a63b3c81..b2d8ddbb4095 100644
--- a/drivers/mmc/host/sdhci-pci-o2micro.c
+++ b/drivers/mmc/host/sdhci-pci-o2micro.c
@@ -21,6 +21,7 @@
* O2Micro device registers
*/
+#define O2_SD_PCIE_SWITCH 0x54
#define O2_SD_MISC_REG5 0x64
#define O2_SD_LD0_CTRL 0x68
#define O2_SD_DEV_CTRL 0x88
@@ -631,6 +632,63 @@ static void sdhci_pci_o2_set_clock(struct sdhci_host *host, unsigned int clock)
sdhci_o2_enable_clk(host, clk);
}
+static u8 sdhci_o2_sd_express_clkq_assert(struct sdhci_host *host)
+{
+ return sdhci_readb(host, O2_SD_EXP_INT_REG);
+}
+
+static int sdhci_pci_o2_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ struct sdhci_pci_slot *slot = sdhci_priv(host);
+ struct sdhci_pci_chip *chip = slot->chip;
+ u8 scratch8 = 0;
+ u16 scratch16 = 0;
+ bool ret = false;
+
+ /* Disable clock */
+ sdhci_writeb(host, 0, SDHCI_CLOCK_CONTROL);
+
+ /* Set VDD2 voltage*/
+ scratch8 = sdhci_readb(host, SDHCI_POWER_CONTROL);
+ scratch8 &= 0x0F;
+ if ((host->mmc->ios.timing == MMC_TIMING_SD_EXP_1_2V) &&
+ (host->mmc->caps2 & MMC_CAP2_SD_EXP_1_2V)) {
+ scratch8 |= BIT(4) | BIT(7);
+ } else
+ scratch8 |= BIT(4) | BIT(5) | BIT(7);
+ sdhci_writeb(host, scratch8, SDHCI_POWER_CONTROL);
+
+ /* UnLock WP */
+ pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch8);
+ scratch8 &= 0x7f;
+ pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch8);
+
+ ret = readx_poll_timeout(sdhci_o2_sd_express_clkq_assert, host,
+ scratch8, !(scratch8 & BIT(0)), 1, 30000) == 0 ? 0 : 1;
+
+ if (!ret) {
+ /* switch to PCIe mode */
+ scratch16 = sdhci_readw(host, O2_SD_PCIE_SWITCH);
+ scratch16 |= BIT(8);
+ sdhci_writew(host, scratch16, O2_SD_PCIE_SWITCH);
+ } else {
+ /* keep mode as USHI */
+ pci_read_config_word(chip->pdev,
+ O2_SD_PARA_SET_REG1, &scratch16);
+ scratch16 &= ~BIT(11);
+ pci_write_config_word(chip->pdev,
+ O2_SD_PARA_SET_REG1, scratch16);
+ }
+ /* Lock WP */
+ pci_read_config_byte(chip->pdev,
+ O2_SD_LOCK_WP, &scratch8);
+ scratch8 |= 0x80;
+ pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch8);
+
+ return ret;
+}
+
static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
{
struct sdhci_pci_chip *chip;
@@ -703,10 +761,11 @@ static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
case PCI_DEVICE_ID_O2_GG8_9861:
case PCI_DEVICE_ID_O2_GG8_9862:
case PCI_DEVICE_ID_O2_GG8_9863:
- host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
+ host->mmc->caps2 |= MMC_CAP2_NO_SDIO | MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V;
host->mmc->caps |= MMC_CAP_HW_RESET;
host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
slot->host->mmc_host_ops.get_cd = sdhci_o2_get_cd;
+ host->mmc_host_ops.init_sd_express = sdhci_pci_o2_init_sd_express;
break;
default:
break;
--
2.25.1
