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mmc: sdhci-esdhc-imx: add std tuning support for mx6sl 

The mx6sl supports standard sdhci tuning, then esdhc_executing_tuning
is only needed for mx6q/dl. We introduce is_imx6_usdhc() and
is_imx6sl_usdhc() to handle the difference.

The standard tuning is enabled by setting ESDHC_TUNE_CTRL_STD_TUNING_EN bit
in new register ESDHC_TUNE_CTRL and operates with new tuning bits
defined in SDHCI_ACMD12_ERR register.

Note: mx6sl can also work on the old manually tuning mode as mx6q/dl if
not enable standard tuning mode.

Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Dong Aisheng 2013-10-18 19:48:43 +08:00 коммит произвёл Chris Ball
Родитель f47c4bbfa2
Коммит 6e9fd28e1f
1 изменённых файлов: 73 добавлений и 17 удалений
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90
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -51,6 +51,11 @@
#define ESDHC_TUNE_CTRL_MIN 0
#define ESDHC_TUNE_CTRL_MAX ((1 << 7) - 1)
#define ESDHC_TUNING_CTRL 0xcc
#define ESDHC_STD_TUNING_EN (1 << 24)
/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
#define ESDHC_TUNING_START_TAP 0x1
#define ESDHC_TUNING_BLOCK_PATTERN_LEN 64
/* pinctrl state */
@ -94,6 +99,12 @@
* integrated on the i.MX6 series.
*/
#define ESDHC_FLAG_USDHC BIT(3)
/* The IP supports manual tuning process */
#define ESDHC_FLAG_MAN_TUNING BIT(4)
/* The IP supports standard tuning process */
#define ESDHC_FLAG_STD_TUNING BIT(5)
/* The IP has SDHCI_CAPABILITIES_1 register */
#define ESDHC_FLAG_HAVE_CAP1 BIT(6)
struct esdhc_soc_data {
u32 flags;
@ -116,7 +127,12 @@ static struct esdhc_soc_data esdhc_imx53_data = {
};
static struct esdhc_soc_data usdhc_imx6q_data = {
.flags = ESDHC_FLAG_USDHC,
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING,
};
static struct esdhc_soc_data usdhc_imx6sl_data = {
.flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
| ESDHC_FLAG_HAVE_CAP1,
};
struct pltfm_imx_data {
@ -159,6 +175,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = {
{ .compatible = "fsl,imx35-esdhc", .data = &esdhc_imx35_data, },
{ .compatible = "fsl,imx51-esdhc", .data = &esdhc_imx51_data, },
{ .compatible = "fsl,imx53-esdhc", .data = &esdhc_imx53_data, },
{ .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, },
{ .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
{ /* sentinel */ }
};
@ -222,9 +239,16 @@ static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
}
}
if (unlikely(reg == SDHCI_CAPABILITIES_1) && esdhc_is_usdhc(imx_data))
val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
| SDHCI_SUPPORT_SDR50;
if (unlikely(reg == SDHCI_CAPABILITIES_1)) {
if (esdhc_is_usdhc(imx_data)) {
if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
val = readl(host->ioaddr + SDHCI_CAPABILITIES) & 0xFFFF;
else
/* imx6q/dl does not have cap_1 register, fake one */
val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
| SDHCI_SUPPORT_SDR50;
}
}
if (unlikely(reg == SDHCI_MAX_CURRENT) && esdhc_is_usdhc(imx_data)) {
val = 0;
@ -331,13 +355,18 @@ static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
ret |= SDHCI_CTRL_VDD_180;
if (esdhc_is_usdhc(imx_data)) {
val = readl(host->ioaddr + ESDHC_MIX_CTRL);
if (val & ESDHC_MIX_CTRL_EXE_TUNE)
ret |= SDHCI_CTRL_EXEC_TUNING;
if (val & ESDHC_MIX_CTRL_SMPCLK_SEL)
ret |= SDHCI_CTRL_TUNED_CLK;
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
val = readl(host->ioaddr + ESDHC_MIX_CTRL);
else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING)
/* the std tuning bits is in ACMD12_ERR for imx6sl */
val = readl(host->ioaddr + SDHCI_ACMD12_ERR);
}
if (val & ESDHC_MIX_CTRL_EXE_TUNE)
ret |= SDHCI_CTRL_EXEC_TUNING;
if (val & ESDHC_MIX_CTRL_SMPCLK_SEL)
ret |= SDHCI_CTRL_TUNED_CLK;
ret |= (imx_data->uhs_mode & SDHCI_CTRL_UHS_MASK);
ret &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
@ -370,12 +399,37 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
new_val &= ~ESDHC_VENDOR_SPEC_VSELECT;
writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
imx_data->uhs_mode = val & SDHCI_CTRL_UHS_MASK;
new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
if (val & SDHCI_CTRL_TUNED_CLK)
new_val |= ESDHC_MIX_CTRL_SMPCLK_SEL;
else
new_val &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
writel(new_val , host->ioaddr + ESDHC_MIX_CTRL);
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
if (val & SDHCI_CTRL_TUNED_CLK)
new_val |= ESDHC_MIX_CTRL_SMPCLK_SEL;
else
new_val &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
writel(new_val , host->ioaddr + ESDHC_MIX_CTRL);
} else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
u32 v = readl(host->ioaddr + SDHCI_ACMD12_ERR);
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
new_val = readl(host->ioaddr + ESDHC_TUNING_CTRL);
if (val & SDHCI_CTRL_EXEC_TUNING) {
new_val |= ESDHC_STD_TUNING_EN |
ESDHC_TUNING_START_TAP;
v |= ESDHC_MIX_CTRL_EXE_TUNE;
m |= ESDHC_MIX_CTRL_FBCLK_SEL;
} else {
new_val &= ~ESDHC_STD_TUNING_EN;
v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
m &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
}
if (val & SDHCI_CTRL_TUNED_CLK)
v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
else
v &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
writel(new_val, host->ioaddr + ESDHC_TUNING_CTRL);
writel(v, host->ioaddr + SDHCI_ACMD12_ERR);
writel(m, host->ioaddr + ESDHC_MIX_CTRL);
}
return;
case SDHCI_TRANSFER_MODE:
if ((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
@ -774,7 +828,7 @@ static int esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
return esdhc_change_pinstate(host, uhs);
}
static const struct sdhci_ops sdhci_esdhc_ops = {
static struct sdhci_ops sdhci_esdhc_ops = {
.read_l = esdhc_readl_le,
.read_w = esdhc_readw_le,
.write_l = esdhc_writel_le,
@ -786,7 +840,6 @@ static const struct sdhci_ops sdhci_esdhc_ops = {
.get_ro = esdhc_pltfm_get_ro,
.platform_bus_width = esdhc_pltfm_bus_width,
.set_uhs_signaling = esdhc_set_uhs_signaling,
.platform_execute_tuning = esdhc_executing_tuning,
};
static const struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
@ -922,6 +975,9 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
if (esdhc_is_usdhc(imx_data))
writel(0x08100810, host->ioaddr + ESDHC_WTMK_LVL);
if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
sdhci_esdhc_ops.platform_execute_tuning =
esdhc_executing_tuning;
boarddata = &imx_data->boarddata;
if (sdhci_esdhc_imx_probe_dt(pdev, boarddata) < 0) {
if (!host->mmc->parent->platform_data) {