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Subject[PATCH 4/4] MMC: Ingenic: Add support for JZ4760 and support for LPM.
Date
1.add support for probing mmc driver on the JZ4760 Soc from Ingenic.
2.add support for Low Power Mode of Ingenic's MMC/SD Controller.

Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
---
drivers/mmc/host/jz4740_mmc.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c
index d6811a7..1e61f1b 100644
--- a/drivers/mmc/host/jz4740_mmc.c
+++ b/drivers/mmc/host/jz4740_mmc.c
@@ -43,6 +43,7 @@
#define JZ_REG_MMC_RES 0x34
#define JZ_REG_MMC_RXFIFO 0x38
#define JZ_REG_MMC_TXFIFO 0x3C
+#define JZ_REG_MMC_LPM 0x40
#define JZ_REG_MMC_DMAC 0x44

#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
@@ -102,11 +103,15 @@
#define JZ_MMC_DMAC_DMA_SEL BIT(1)
#define JZ_MMC_DMAC_DMA_EN BIT(0)

+#define JZ_MMC_LPM_DRV_RISING BIT(31)
+#define JZ_MMC_LPM_LOW_POWER_MODE_EN BIT(0)
+
#define JZ_MMC_CLK_RATE 24000000

enum jz4740_mmc_version {
JZ_MMC_JZ4740,
JZ_MMC_JZ4725B,
+ JZ_MMC_JZ4760,
JZ_MMC_JZ4780,
};

@@ -858,6 +863,16 @@ static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
}

writew(div, host->base + JZ_REG_MMC_CLKRT);
+
+ if (host->version >= JZ_MMC_JZ4760) {
+ if (real_rate > 25000000)
+ writel(JZ_MMC_LPM_DRV_RISING |
+ JZ_MMC_LPM_LOW_POWER_MODE_EN,
+ host->base + JZ_REG_MMC_LPM);
+ } else if (host->version >= JZ_MMC_JZ4725B)
+ writel(JZ_MMC_LPM_LOW_POWER_MODE_EN,
+ host->base + JZ_REG_MMC_LPM);
+
return real_rate;
}

@@ -935,6 +950,7 @@ static const struct mmc_host_ops jz4740_mmc_ops = {
static const struct of_device_id jz4740_mmc_of_match[] = {
{ .compatible = "ingenic,jz4740-mmc", .data = (void *) JZ_MMC_JZ4740 },
{ .compatible = "ingenic,jz4725b-mmc", .data = (void *)JZ_MMC_JZ4725B },
+ { .compatible = "ingenic,jz4760-mmc", .data = (void *) JZ_MMC_JZ4760 },
{ .compatible = "ingenic,jz4780-mmc", .data = (void *) JZ_MMC_JZ4780 },
{},
};
--
2.7.4

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