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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>
This commit is contained in:
Zhou Yanjie 2019-10-12 13:13:20 +08:00 committed by Ulf Hansson
parent fea5fcc257
commit 80fe4e9066
1 changed files with 23 additions and 0 deletions
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23
drivers/mmc/host/jz4740_mmc.c
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@ -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;
}