[PATCH v2 2/8] mmc: sdhci-st: Add support for de-asserting reset signal and top regs resource

[Peter Griffin]

STiH407 family SoC's can have a reset signal for the controller which needs to
be managed. Also the eMMC controller has some additional 'top' memory mapped
registers which are used to manage the dynamic and static delay required for
UHS modes. This patch adds support for creating the mapping, which will be used
by subsequent patches.

Signed-off-by: Peter Griffin <peter.griffin at linaro.org>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro at st.com>
---
 drivers/mmc/host/sdhci-st.c | 52 ++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 49 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
index a3bc3c3..0101ae9 100644
--- a/drivers/mmc/host/sdhci-st.c
+++ b/drivers/mmc/host/sdhci-st.c
@@ -23,9 +23,14 @@
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/mmc/host.h>
-
+#include <linux/reset.h>
 #include "sdhci-pltfm.h"
 
+struct st_mmc_platform_data {
+	struct  reset_control *rstc;
+	void __iomem *top_ioaddr;
+};
+
 /* MMCSS glue logic to setup the HC on some ST SoCs (e.g. STiH407 family) */
 
 #define	ST_MMC_CCONFIG_REG_1		0x400
@@ -151,10 +156,16 @@ static const struct sdhci_pltfm_data sdhci_st_pdata = {
 static int sdhci_st_probe(struct platform_device *pdev)
 {
 	struct sdhci_host *host;
+	struct st_mmc_platform_data *pdata;
 	struct sdhci_pltfm_host *pltfm_host;
 	struct clk *clk;
 	int ret = 0;
 	u16 host_version;
+	struct resource *res;
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
 
 	clk =  devm_clk_get(&pdev->dev, "mmc");
 	if (IS_ERR(clk)) {
@@ -162,10 +173,17 @@ static int sdhci_st_probe(struct platform_device *pdev)
 		return PTR_ERR(clk);
 	}
 
+	pdata->rstc = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(pdata->rstc))
+		pdata->rstc = NULL;
+	else
+		reset_control_deassert(pdata->rstc);
+
 	host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0);
 	if (IS_ERR(host)) {
 		dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
-		return PTR_ERR(host);
+		ret = PTR_ERR(host);
+		goto err_pltfm_init;
 	}
 
 	ret = mmc_of_parse(host->mmc);
@@ -176,7 +194,17 @@ static int sdhci_st_probe(struct platform_device *pdev)
 
 	clk_prepare_enable(clk);
 
+	/* Configure the FlashSS Top registers for setting eMMC TX/RX delay */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "top-mmc-delay");
+	pdata->top_ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(pdata->top_ioaddr)) {
+		dev_warn(&pdev->dev, "FlashSS Top Dly registers not available");
+		pdata->top_ioaddr = NULL;
+	}
+
 	pltfm_host = sdhci_priv(host);
+	pltfm_host->priv = pdata;
 	pltfm_host->clk = clk;
 
 	ret = sdhci_add_host(host);
@@ -200,6 +228,9 @@ err_out:
 	clk_disable_unprepare(clk);
 err_of:
 	sdhci_pltfm_free(pdev);
+err_pltfm_init:
+	if (pdata->rstc)
+		reset_control_assert(pdata->rstc);
 
 	return ret;
 }
@@ -208,10 +239,17 @@ static int sdhci_st_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct st_mmc_platform_data *pdata = pltfm_host->priv;
+	int ret;
 
 	clk_disable_unprepare(pltfm_host->clk);
 
-	return sdhci_pltfm_unregister(pdev);
+	ret = sdhci_pltfm_unregister(pdev);
+
+	if (pdata->rstc)
+		reset_control_assert(pdata->rstc);
+
+	return ret;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -219,11 +257,15 @@ static int sdhci_st_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct st_mmc_platform_data *pdata = pltfm_host->priv;
 	int ret = sdhci_suspend_host(host);
 
 	if (ret)
 		goto out;
 
+	if (pdata->rstc)
+		reset_control_assert(pdata->rstc);
+
 	clk_disable_unprepare(pltfm_host->clk);
 out:
 	return ret;
@@ -233,9 +275,13 @@ static int sdhci_st_resume(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct st_mmc_platform_data *pdata = pltfm_host->priv;
 
 	clk_prepare_enable(pltfm_host->clk);
 
+	if (pdata->rstc)
+		reset_control_deassert(pdata->rstc);
+
 	return sdhci_resume_host(host);
 }
 #endif
-- 
1.9.1