linux-kernel - [PATCH 5/6] mmc: sdhci-of-arasan: Add Support for AM654 MMC and PHY

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Date:   Thu, 4 Oct 2018 16:44:50 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>
CC:     <kishon@...com>, <faiz_abbas@...com>, <ulf.hansson@...aro.org>,
        <robh+dt@...nel.org>, <catalin.marinas@....com>,
        <adrian.hunter@...el.com>
Subject: [PATCH 5/6] mmc: sdhci-of-arasan: Add Support for AM654 MMC and PHY

The current arasan sdhci PHY configuration isn't compatible
with the PHY on TI's AM654 devices.

Therefore, add a new compatible, AM654 specific quirks
and a new AM654 specific set_clock function which
configures the PHY in a sane way.

Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 46 ++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index c9e3e050ccc8..142c4b802f31 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -231,6 +231,25 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
 	}
 }
 
+static void sdhci_arasan_am654_set_clock(struct sdhci_host *host,
+					 unsigned int clock)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
+
+	if (sdhci_arasan->is_phy_on) {
+		phy_power_off(sdhci_arasan->phy);
+		sdhci_arasan->is_phy_on = false;
+	}
+
+	sdhci_set_clock(host, clock);
+
+	if (clock > PHY_CLK_TOO_SLOW_HZ) {
+		phy_power_on(sdhci_arasan->phy);
+		sdhci_arasan->is_phy_on = true;
+	}
+}
+
 static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
 					struct mmc_ios *ios)
 {
@@ -316,6 +335,29 @@ static struct sdhci_arasan_of_data sdhci_arasan_data = {
 	.pdata = &sdhci_arasan_pdata,
 };
 
+static const struct sdhci_ops sdhci_arasan_am654_ops = {
+	.set_clock = sdhci_arasan_am654_set_clock,
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
+	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
+	.set_bus_width = sdhci_set_bus_width,
+	.reset = sdhci_arasan_reset,
+	.set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static const struct sdhci_pltfm_data sdhci_arasan_am654_pdata = {
+	.ops = &sdhci_arasan_am654_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN  |
+		  SDHCI_QUIRK_INVERTED_WRITE_PROTECT |
+		  SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		   SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
+		   SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400,
+};
+
+static const struct sdhci_arasan_of_data sdhci_arasan_am654_data = {
+	.pdata = &sdhci_arasan_am654_pdata,
+};
+
 static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32 intmask)
 {
 	int cmd_error = 0;
@@ -478,6 +520,10 @@ static const struct of_device_id sdhci_arasan_of_match[] = {
 		.compatible = "rockchip,rk3399-sdhci-5.1",
 		.data = &sdhci_arasan_rk3399_data,
 	},
+	{
+		.compatible = "ti,am654-sdhci-5.1",
+		.data = &sdhci_arasan_am654_data,
+	},
 	/* Generic compatible below here */
 	{
 		.compatible = "arasan,sdhci-8.9a",
-- 
2.18.0