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| author | Zhou Yanjie <zhouyanjie@zoho.com> | 2019-10-12 13:13:20 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-11-13 16:10:16 +0100 |
| commit | 80fe4e90665a9fa9da3d61df65c6667ab80c3294 (patch) | |
| tree | c4131ff1d5584d18576a1b2bf537d7c6033b204c | |
| parent | fea5fcc25788d5980f34a5ec4197ab06abfdf898 (diff) | |
| download | linux-80fe4e90665a9fa9da3d61df65c6667ab80c3294.tar.gz linux-80fe4e90665a9fa9da3d61df65c6667ab80c3294.tar.bz2 linux-80fe4e90665a9fa9da3d61df65c6667ab80c3294.zip | |
mmc: jz4740: Add support for Low Power Mode (LPM)
Add support for low power mode to the Ingenic's MMC/SD Controller.
Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/host/jz4740_mmc.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c index 0f69ba60f37c..78383f60a3dc 100644 --- a/drivers/mmc/host/jz4740_mmc.c +++ b/drivers/mmc/host/jz4740_mmc.c @@ -41,6 +41,7 @@ #define JZ_REG_MMC_RESP_FIFO 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) @@ -100,6 +101,12 @@ #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_DRV_RISING_QTR_PHASE_DLY BIT(31) +#define JZ_MMC_LPM_DRV_RISING_1NS_DLY BIT(30) +#define JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY BIT(29) +#define JZ_MMC_LPM_LOW_POWER_MODE_EN BIT(0) + #define JZ_MMC_CLK_RATE 24000000 enum jz4740_mmc_version { @@ -856,6 +863,22 @@ static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate) } writew(div, host->base + JZ_REG_MMC_CLKRT); + + if (real_rate > 25000000) { + if (host->version >= JZ_MMC_X1000) { + writel(JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY | + JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY | + JZ_MMC_LPM_LOW_POWER_MODE_EN, + host->base + JZ_REG_MMC_LPM); + } else if (host->version >= JZ_MMC_JZ4760) { + 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; } |