| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 10 Apr 2015 09:58:24 +0100
From: Peter Griffin <peter.griffin@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
ulf.hansson@...aro.org, maxime.coquelin@...com,
patrice.chotard@...com, srinivas.kandagatla@...il.com
Cc: peter.griffin@...aro.org, lee.jones@...aro.org,
devicetree@...r.kernel.org, linux-mmc@...r.kernel.org,
peppe.cavallaro@...com
Subject: [PATCH v4 2/9] mmc: sdhci-st: Add support for de-asserting reset signal and top regs resource
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@...aro.org>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
Acked-by: Maxime Coquelin <maxime.coquelin@...com>
---
drivers/mmc/host/sdhci-st.c | 59 ++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 56 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
index a80de93..f6f2a48 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 +228,23 @@ 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;
+}
+
+static int sdhci_st_remove(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct st_mmc_platform_data *pdata = pltfm_host->priv;
+ int ret;
+
+ ret = sdhci_pltfm_unregister(pdev);
+
+ if (pdata->rstc)
+ reset_control_assert(pdata->rstc);
return ret;
}
@@ -209,11 +254,15 @@ 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;
@@ -223,9 +272,13 @@ 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
@@ -241,7 +294,7 @@ MODULE_DEVICE_TABLE(of, st_sdhci_match);
static struct platform_driver sdhci_st_driver = {
.probe = sdhci_st_probe,
- .remove = sdhci_pltfm_unregister,
+ .remove = sdhci_st_remove,
.driver = {
.name = "sdhci-st",
.pm = &sdhci_st_pmops,
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists