Commit c31165d7 authored by Shyam Sundar S K's avatar Shyam Sundar S K Committed by Ulf Hansson
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mmc: sdhci-pci: Add support for HS200 tuning mode on AMD, eMMC-4.5.1



This patch adds support for HS200 tuning mode on AMD eMMC-4.5.1

Reviewed-by: default avatarSen, Pankaj <Pankaj.Sen@amd.com>
Reviewed-by: default avatarShah, Nehal-bakulchandra <Nehal-bakulchandra.Shah@amd.com>
Reviewed-by: default avatarAgrawal, Nitesh-kumar <Nitesh-kumar.Agrawal@amd.com>
Signed-off-by: default avatarS-k, Shyam-sundar <Shyam-sundar.S-k@amd.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 8336bf68
......@@ -865,6 +865,86 @@ enum amd_chipset_gen {
AMD_CHIPSET_UNKNOWN,
};
/* AMD registers */
#define AMD_SD_AUTO_PATTERN 0xB8
#define AMD_MSLEEP_DURATION 4
#define AMD_SD_MISC_CONTROL 0xD0
#define AMD_MAX_TUNE_VALUE 0x0B
#define AMD_AUTO_TUNE_SEL 0x10800
#define AMD_FIFO_PTR 0x30
#define AMD_BIT_MASK 0x1F
static void amd_tuning_reset(struct sdhci_host *host)
{
unsigned int val;
val = sdhci_readw(host, SDHCI_HOST_CONTROL2);
val |= SDHCI_CTRL_PRESET_VAL_ENABLE | SDHCI_CTRL_EXEC_TUNING;
sdhci_writew(host, val, SDHCI_HOST_CONTROL2);
val = sdhci_readw(host, SDHCI_HOST_CONTROL2);
val &= ~SDHCI_CTRL_EXEC_TUNING;
sdhci_writew(host, val, SDHCI_HOST_CONTROL2);
}
static void amd_config_tuning_phase(struct pci_dev *pdev, u8 phase)
{
unsigned int val;
pci_read_config_dword(pdev, AMD_SD_AUTO_PATTERN, &val);
val &= ~AMD_BIT_MASK;
val |= (AMD_AUTO_TUNE_SEL | (phase << 1));
pci_write_config_dword(pdev, AMD_SD_AUTO_PATTERN, val);
}
static void amd_enable_manual_tuning(struct pci_dev *pdev)
{
unsigned int val;
pci_read_config_dword(pdev, AMD_SD_MISC_CONTROL, &val);
val |= AMD_FIFO_PTR;
pci_write_config_dword(pdev, AMD_SD_MISC_CONTROL, val);
}
static int amd_execute_tuning(struct sdhci_host *host, u32 opcode)
{
struct sdhci_pci_slot *slot = sdhci_priv(host);
struct pci_dev *pdev = slot->chip->pdev;
u8 valid_win = 0;
u8 valid_win_max = 0;
u8 valid_win_end = 0;
u8 ctrl, tune_around;
amd_tuning_reset(host);
for (tune_around = 0; tune_around < 12; tune_around++) {
amd_config_tuning_phase(pdev, tune_around);
if (mmc_send_tuning(host->mmc, opcode, NULL)) {
valid_win = 0;
msleep(AMD_MSLEEP_DURATION);
ctrl = SDHCI_RESET_CMD | SDHCI_RESET_DATA;
sdhci_writeb(host, ctrl, SDHCI_SOFTWARE_RESET);
} else if (++valid_win > valid_win_max) {
valid_win_max = valid_win;
valid_win_end = tune_around;
}
}
if (!valid_win_max) {
dev_err(&pdev->dev, "no tuning point found\n");
return -EIO;
}
amd_config_tuning_phase(pdev, valid_win_end - valid_win_max / 2);
amd_enable_manual_tuning(pdev);
host->mmc->retune_period = 0;
return 0;
}
static int amd_probe(struct sdhci_pci_chip *chip)
{
struct pci_dev *smbus_dev;
......@@ -887,16 +967,24 @@ static int amd_probe(struct sdhci_pci_chip *chip)
}
}
if ((gen == AMD_CHIPSET_BEFORE_ML) || (gen == AMD_CHIPSET_CZ)) {
if (gen == AMD_CHIPSET_BEFORE_ML || gen == AMD_CHIPSET_CZ)
chip->quirks2 |= SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD;
chip->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
}
return 0;
}
static const struct sdhci_ops amd_sdhci_pci_ops = {
.set_clock = sdhci_set_clock,
.enable_dma = sdhci_pci_enable_dma,
.set_bus_width = sdhci_pci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
.platform_execute_tuning = amd_execute_tuning,
};
static const struct sdhci_pci_fixes sdhci_amd = {
.probe = amd_probe,
.ops = &amd_sdhci_pci_ops,
};
static const struct pci_device_id pci_ids[] = {
......
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