linux-kernel - [PATCH 03/12] mmc: sdhci-omap: Add custom set_uhs_signaling sdhci

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Message-ID: <20171214130941.26666-4-kishon@ti.com>
Date:   Thu, 14 Dec 2017 18:39:32 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Adrian Hunter <adrian.hunter@...el.com>
CC:     Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>,
        <kishon@...com>
Subject: [PATCH 03/12] mmc: sdhci-omap: Add custom set_uhs_signaling sdhci_host ops

UHS-1 DDR50 and MMC DDR52 mode require DDR bit to be
set in the configuration register (MMCHS_CON). Add
sdhci-omap specific set_uhs_signaling ops to set
this bit. Also while setting the UHSMS bit, clock should be
disabled.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/mmc/host/sdhci-omap.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index defe4eac020d..8f7239e2edc2 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -31,6 +31,7 @@
 #define SDHCI_OMAP_CON		0x12c
 #define CON_DW8			BIT(5)
 #define CON_DMA_MASTER		BIT(20)
+#define CON_DDR			BIT(19)
 #define CON_CLKEXTFREE		BIT(16)
 #define CON_PADEN		BIT(15)
 #define CON_INIT		BIT(1)
@@ -93,6 +94,9 @@ struct sdhci_omap_host {
 	u8			power_mode;
 };
 
+static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
+static void sdhci_omap_stop_clock(struct sdhci_omap_host *omap_host);
+
 static inline u32 sdhci_omap_readl(struct sdhci_omap_host *host,
 				   unsigned int offset)
 {
@@ -471,6 +475,26 @@ static void sdhci_omap_init_74_clocks(struct sdhci_host *host, u8 power_mode)
 	enable_irq(host->irq);
 }
 
+static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
+					 unsigned int timing)
+{
+	u32 reg;
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+
+	sdhci_omap_stop_clock(omap_host);
+
+	reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+	if (timing == MMC_TIMING_UHS_DDR50 || timing == MMC_TIMING_MMC_DDR52)
+		reg |= CON_DDR;
+	else
+		reg &= ~CON_DDR;
+	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
+
+	sdhci_set_uhs_signaling(host, timing);
+	sdhci_omap_start_clock(omap_host);
+}
+
 static struct sdhci_ops sdhci_omap_ops = {
 	.set_clock = sdhci_omap_set_clock,
 	.set_power = sdhci_omap_set_power,
@@ -480,7 +504,7 @@ static struct sdhci_ops sdhci_omap_ops = {
 	.set_bus_width = sdhci_omap_set_bus_width,
 	.platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
 	.reset = sdhci_reset,
-	.set_uhs_signaling = sdhci_set_uhs_signaling,
+	.set_uhs_signaling = sdhci_omap_set_uhs_signaling,
 };
 
 static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
-- 
2.11.0