From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhou Yanjie Subject: [PATCH 6/6 v2] MMC: JZ4740: Add support for LPM. Date: Sat, 12 Oct 2019 13:13:20 +0800 Message-ID: <1570857203-49192-7-git-send-email-zhouyanjie@zoho.com> References: <1567669089-88693-1-git-send-email-zhouyanjie@zoho.com> <1570857203-49192-1-git-send-email-zhouyanjie@zoho.com> Return-path: In-Reply-To: <1570857203-49192-1-git-send-email-zhouyanjie@zoho.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org, paul.burton@mips.com, mark.rutland@arm.com, syq@debian.org, ulf.hansson@linaro.org, linus.walleij@linaro.org, armijn@tjaldur.nl, tglx@linutronix.de, yuehaibing@huawei.com, malat@debian.org, ezequiel@collabora.com, paul@crapouillou.net List-Id: devicetree@vger.kernel.org add support for low power mode of Ingenic's MMC/SD Controller. Signed-off-by: Zhou Yanjie --- drivers/mmc/host/jz4740_mmc.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c index 44a04fe..4cbe7fb 100644 --- a/drivers/mmc/host/jz4740_mmc.c +++ b/drivers/mmc/host/jz4740_mmc.c @@ -43,6 +43,7 @@ #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) @@ -102,6 +103,12 @@ #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 { @@ -860,6 +867,22 @@ 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; } -- 2.7.4