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Date: Tue, 18 Jun 2019 00:46:16 -0700
From: Sowjanya Komatineni <skomatineni@...dia.com>
To: <thierry.reding@...il.com>, <jonathanh@...dia.com>,
<tglx@...utronix.de>, <jason@...edaemon.net>,
<marc.zyngier@....com>, <linus.walleij@...aro.org>,
<stefan@...er.ch>, <mark.rutland@....com>
CC: <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
<sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
<linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
<josephl@...dia.com>, <talho@...dia.com>, <skomatineni@...dia.com>,
<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
<digetx@...il.com>, <devicetree@...r.kernel.org>
Subject: [PATCH V3 02/17] pinctrl: tegra: add suspend and resume support
This patch adds suspend and resume support for Tegra pinctrl driver
and registers them to syscore so the pinmux settings are restored
before the devices resume.
Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
---
drivers/pinctrl/tegra/pinctrl-tegra.c | 62 ++++++++++++++++++++++++++++++++
drivers/pinctrl/tegra/pinctrl-tegra.h | 5 +++
drivers/pinctrl/tegra/pinctrl-tegra114.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra124.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra20.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra210.c | 13 +++++++
drivers/pinctrl/tegra/pinctrl-tegra30.c | 1 +
7 files changed, 84 insertions(+)
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
index 34596b246578..ceced30d8bd1 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
@@ -20,11 +20,16 @@
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/slab.h>
+#include <linux/syscore_ops.h>
#include "../core.h"
#include "../pinctrl-utils.h"
#include "pinctrl-tegra.h"
+#define EMMC2_PAD_CFGPADCTRL_0 0x1c8
+#define EMMC4_PAD_CFGPADCTRL_0 0x1e0
+#define EMMC_DPD_PARKING (0x1fff << 14)
+
static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
{
return readl(pmx->regs[bank] + reg);
@@ -619,6 +624,48 @@ static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
}
}
+
+ if (pmx->soc->has_park_padcfg) {
+ val = pmx_readl(pmx, 0, EMMC2_PAD_CFGPADCTRL_0);
+ val &= ~EMMC_DPD_PARKING;
+ pmx_writel(pmx, val, 0, EMMC2_PAD_CFGPADCTRL_0);
+
+ val = pmx_readl(pmx, 0, EMMC4_PAD_CFGPADCTRL_0);
+ val &= ~EMMC_DPD_PARKING;
+ pmx_writel(pmx, val, 0, EMMC4_PAD_CFGPADCTRL_0);
+ }
+}
+
+int __maybe_unused tegra_pinctrl_suspend(struct device *dev)
+{
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ u32 *backup_regs = pmx->backup_regs;
+ u32 *regs;
+ int i, j;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ regs = pmx->regs[i];
+ for (j = 0; j < pmx->reg_bank_size[i] / 4; j++)
+ *backup_regs++ = readl(regs++);
+ }
+
+ return pinctrl_force_sleep(pmx->pctl);
+}
+
+int __maybe_unused tegra_pinctrl_resume(struct device *dev)
+{
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ u32 *backup_regs = pmx->backup_regs;
+ u32 *regs;
+ int i, j;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ regs = pmx->regs[i];
+ for (j = 0; j < pmx->reg_bank_size[i] / 4; j++)
+ writel(*backup_regs++, regs++);
+ }
+
+ return 0;
}
static bool gpio_node_has_range(const char *compatible)
@@ -645,6 +692,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
int i;
const char **group_pins;
int fn, gn, gfn;
+ unsigned long backup_regs_size = 0;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx)
@@ -697,6 +745,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
+ backup_regs_size += resource_size(res);
}
pmx->nbanks = i;
@@ -705,11 +754,24 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
if (!pmx->regs)
return -ENOMEM;
+ pmx->reg_bank_size = devm_kcalloc(&pdev->dev, pmx->nbanks,
+ sizeof(*pmx->reg_bank_size),
+ GFP_KERNEL);
+ if (!pmx->reg_bank_size)
+ return -ENOMEM;
+
+ pmx->backup_regs = devm_kzalloc(&pdev->dev, backup_regs_size,
+ GFP_KERNEL);
+ if (!pmx->backup_regs)
+ return -ENOMEM;
+
for (i = 0; i < pmx->nbanks; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
pmx->regs[i] = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pmx->regs[i]))
return PTR_ERR(pmx->regs[i]);
+
+ pmx->reg_bank_size[i] = resource_size(res);
}
pmx->pctl = devm_pinctrl_register(&pdev->dev, &tegra_pinctrl_desc, pmx);
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.h b/drivers/pinctrl/tegra/pinctrl-tegra.h
index 287702660783..d63e472ee0e1 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.h
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.h
@@ -17,6 +17,8 @@ struct tegra_pmx {
int nbanks;
void __iomem **regs;
+ size_t *reg_bank_size;
+ u32 *backup_regs;
};
enum tegra_pinconf_param {
@@ -191,8 +193,11 @@ struct tegra_pinctrl_soc_data {
bool hsm_in_mux;
bool schmitt_in_mux;
bool drvtype_in_mux;
+ bool has_park_padcfg;
};
int tegra_pinctrl_probe(struct platform_device *pdev,
const struct tegra_pinctrl_soc_data *soc_data);
+int __maybe_unused tegra_pinctrl_suspend(struct device *dev);
+int __maybe_unused tegra_pinctrl_resume(struct device *dev);
#endif
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra114.c b/drivers/pinctrl/tegra/pinctrl-tegra114.c
index 762151f17a88..06ea8164df9d 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra114.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra114.c
@@ -1841,6 +1841,7 @@ static const struct tegra_pinctrl_soc_data tegra114_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};
static int tegra114_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra124.c b/drivers/pinctrl/tegra/pinctrl-tegra124.c
index 930c43758c92..abc8fe92d154 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra124.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra124.c
@@ -2053,6 +2053,7 @@ static const struct tegra_pinctrl_soc_data tegra124_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};
static int tegra124_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra20.c b/drivers/pinctrl/tegra/pinctrl-tegra20.c
index 4b7837e38fb5..993b82cbfba7 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra20.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra20.c
@@ -2223,6 +2223,7 @@ static const struct tegra_pinctrl_soc_data tegra20_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};
static const char *cdev1_parents[] = {
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra210.c b/drivers/pinctrl/tegra/pinctrl-tegra210.c
index 0b56ad5c9c1c..10e8a2ec8094 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra210.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra210.c
@@ -1555,6 +1555,7 @@ static const struct tegra_pinctrl_soc_data tegra210_pinctrl = {
.hsm_in_mux = true,
.schmitt_in_mux = true,
.drvtype_in_mux = true,
+ .has_park_padcfg = true,
};
static int tegra210_pinctrl_probe(struct platform_device *pdev)
@@ -1562,6 +1563,17 @@ static int tegra210_pinctrl_probe(struct platform_device *pdev)
return tegra_pinctrl_probe(pdev, &tegra210_pinctrl);
}
+#ifdef CONFIG_PM_SLEEP
+static const struct dev_pm_ops tegra_pinctrl_pm = {
+ .suspend = &tegra_pinctrl_suspend,
+ .resume = &tegra_pinctrl_resume
+};
+
+#define TEGRA_PINCTRL_PM (&tegra_pinctrl_pm)
+#else
+#define TEGRA_PINCTRL_PM NULL
+#endif
+
static const struct of_device_id tegra210_pinctrl_of_match[] = {
{ .compatible = "nvidia,tegra210-pinmux", },
{ },
@@ -1571,6 +1583,7 @@ static struct platform_driver tegra210_pinctrl_driver = {
.driver = {
.name = "tegra210-pinctrl",
.of_match_table = tegra210_pinctrl_of_match,
+ .pm = TEGRA_PINCTRL_PM,
},
.probe = tegra210_pinctrl_probe,
};
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra30.c b/drivers/pinctrl/tegra/pinctrl-tegra30.c
index 610124c3d192..779ee40e5f21 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra30.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra30.c
@@ -2476,6 +2476,7 @@ static const struct tegra_pinctrl_soc_data tegra30_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};
static int tegra30_pinctrl_probe(struct platform_device *pdev)
--
2.7.4
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