linux-kernel - [RFC PATCH 1/3] mmc: omap_hsmmc: set host capabilities by reading MMCHS

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Message-ID: <1415890458-20436-2-git-send-email-kishon@ti.com>
Date:	Thu, 13 Nov 2014 20:24:16 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<chris@...ntf.net>, <ulf.hansson@...aro.org>, <tony@...mide.com>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<afenkart@...il.com>, <nsekhar@...com>, <kishon@...com>
Subject: [RFC PATCH 1/3] mmc: omap_hsmmc: set host capabilities by reading MMCHS_CAPA2 register

From: Viswanath Puttagunta <vishp@...com>

set SDR104, SDR50, DDR50 and HS200 capability flags to caps/caps2 by reading
MMCHS_CAPA2 register.

Signed-off-by: Viswanath Puttagunta <vishp@...com>
Signed-off-by: Sourav Poddar <sourav.poddar@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Suggested-by: Misael Lopez Cruz <misael.lopez@...com>
---
 drivers/mmc/host/omap_hsmmc.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index df27bb4..2e42ed3 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -64,6 +64,7 @@
 #define OMAP_HSMMC_ISE		0x0138
 #define OMAP_HSMMC_AC12		0x013C
 #define OMAP_HSMMC_CAPA		0x0140
+#define OMAP_HSMMC_CAPA2	0x0144
 
 #define VS18			(1 << 26)
 #define VS30			(1 << 25)
@@ -139,6 +140,10 @@
 #define ACTO	(1 << 1)
 #define ACNE	(1 << 0)
 
+#define SDR50	(1 << 0)
+#define SDR104	(1 << 1)
+#define DDR50	(1 << 2)
+
 #define MMC_AUTOSUSPEND_DELAY	100
 #define MMC_TIMEOUT_MS		20		/* 20 mSec */
 #define MMC_TIMEOUT_US		20000		/* 20000 micro Sec */
@@ -2028,6 +2033,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	unsigned tx_req, rx_req;
 	const struct omap_mmc_of_data *data;
 	void __iomem *base;
+	u32 reg;
 
 	match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
 	if (match) {
@@ -2153,6 +2159,19 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	mmc->pm_caps = mmc_slot(host).pm_caps;
 
+	reg = OMAP_HSMMC_READ(host->base, OMAP_HSMMC_CAPA2);
+
+	if (reg & SDR50)
+		mmc->caps |= MMC_CAP_UHS_DDR50;
+
+	if (reg & SDR104) {
+		mmc->caps |= MMC_CAP_UHS_SDR104;
+		mmc->caps2 |= MMC_CAP2_HS200;
+	}
+
+	if (reg & DDR50)
+		mmc->caps |= MMC_CAP_UHS_DDR50;
+
 	omap_hsmmc_conf_bus_power(host);
 
 	if (!pdev->dev.of_node) {
-- 
1.7.9.5

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