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mmc: sdhci: Add support for O2 eMMC HS200 mode

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When use eMMC as boot device, the eMMC signaling voltage is tied to 1.8v
fixed output voltage, bios can set o2 sd host controller PCI configuration
register 0x308 bit4 to 1 to let driver skip 3.3v signaling voltage and
direct use 1.8v singling voltage in eMMC initialize process.

Signed-off-by: ernest.zhang <ernest.zhang@bayhubtech.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
ernest.zhang 2018-07-16 14:26:51 +08:00 committed by Ulf Hansson
parent 44350993d0
commit 57322d542f
1 changed files with 18 additions and 0 deletions
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18
drivers/mmc/host/sdhci-pci-o2micro.c
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@ -3,6 +3,7 @@
*
* Authors: Peter Guo <peter.guo@bayhubtech.com>
* Adam Lee <adam.lee@canonical.com>
* Ernest Zhang <ernest.zhang@bayhubtech.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
@ -39,6 +40,7 @@
#define O2_SD_MISC_CTRL4 0xFC
#define O2_SD_TUNING_CTRL 0x300
#define O2_SD_PLL_SETTING 0x304
#define O2_SD_MISC_SETTING 0x308
#define O2_SD_CLK_SETTING 0x328
#define O2_SD_CAP_REG2 0x330
#define O2_SD_CAP_REG0 0x334
@ -184,6 +186,7 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
struct sdhci_pci_chip *chip;
struct sdhci_host *host;
u32 reg;
int ret;
chip = slot->chip;
host = slot->host;
@ -197,6 +200,21 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
if (reg & 0x1)
host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {
ret = pci_read_config_dword(chip->pdev,
O2_SD_MISC_SETTING, &reg);
if (ret)
return -EIO;
if (reg & (1 << 4)) {
pr_info("%s: emmc 1.8v flag is set, force 1.8v signaling voltage\n",
mmc_hostname(host->mmc));
host->flags &= ~SDHCI_SIGNALING_330;
host->flags |= SDHCI_SIGNALING_180;
host->mmc->caps2 |= MMC_CAP2_NO_SD;
host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
}
}
if (chip->pdev->device != PCI_DEVICE_ID_O2_FUJIN2)
break;
/* set dll watch dog timer */