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authorZhou Yanjie <zhouyanjie@zoho.com>2019-10-12 13:13:20 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2019-11-13 16:10:16 +0100
commit80fe4e90665a9fa9da3d61df65c6667ab80c3294 (patch)
treec4131ff1d5584d18576a1b2bf537d7c6033b204c /drivers/mmc
parentfea5fcc25788d5980f34a5ec4197ab06abfdf898 (diff)
downloadlinux-80fe4e90665a9fa9da3d61df65c6667ab80c3294.tar.bz2
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/jz4740_mmc.c23
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;
}