Commit 5f84bb1a authored by Sandipan Patra's avatar Sandipan Patra Committed by Thierry Reding
Browse files

soc/tegra: pmc: Add sysfs entries for reset info 



Implement read-only reset_reason and reset_level sysfs attributes that
can be used to query the reset reason and level at runtime.

Signed-off-by: default avatarSandipan Patra <spatra@nvidia.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 3bb2f843

drivers/soc/tegra/pmc.c

+128 −1
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
 * drivers/soc/tegra/pmc.c

 *

 * Copyright (c) 2010 Google, Inc

 * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.

 *

 * Author:

 *	Colin Cross <ccross@google.com>
@@ -92,7 +93,6 @@ 
#define  PMC_SENSOR_CTRL_SCRATCH_WRITE	BIT(2)

#define  PMC_SENSOR_CTRL_ENABLE_RST	BIT(1)



#define PMC_RST_STATUS			0x1b4

#define  PMC_RST_STATUS_POR		0

#define  PMC_RST_STATUS_WATCHDOG	1

#define  PMC_RST_STATUS_SENSOR		2
@@ -151,6 +151,11 @@ struct tegra_pmc_regs { 
	unsigned int dpd_status;

	unsigned int dpd2_req;

	unsigned int dpd2_status;

	unsigned int rst_status;

	unsigned int rst_source_shift;

	unsigned int rst_source_mask;

	unsigned int rst_level_shift;

	unsigned int rst_level_mask;

};



struct tegra_pmc_soc {
@@ -175,6 +180,42 @@ struct tegra_pmc_soc { 
	void (*setup_irq_polarity)(struct tegra_pmc *pmc,

				   struct device_node *np,

				   bool invert);



	const char * const *reset_sources;

	unsigned int num_reset_sources;

	const char * const *reset_levels;

	unsigned int num_reset_levels;

};



static const char * const tegra186_reset_sources[] = {

	"SYS_RESET",

	"AOWDT",

	"MCCPLEXWDT",

	"BPMPWDT",

	"SCEWDT",

	"SPEWDT",

	"APEWDT",

	"BCCPLEXWDT",

	"SENSOR",

	"AOTAG",

	"VFSENSOR",

	"SWREST",

	"SC7",

	"HSM",

	"CORESIGHT"

};



static const char * const tegra186_reset_levels[] = {

	"L0", "L1", "L2", "WARM"

};



static const char * const tegra30_reset_sources[] = {

	"POWER_ON_RESET",

	"WATCHDOG",

	"SENSOR",

	"SW_MAIN",

	"LP0",

	"AOTAG"

};



/**
@@ -1527,6 +1568,56 @@ static int tegra_pmc_pinctrl_init(struct tegra_pmc *pmc) 
	return err;

}



static ssize_t reset_reason_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{

	u32 value, rst_src;



	value = tegra_pmc_readl(pmc->soc->regs->rst_status);

	rst_src = (value & pmc->soc->regs->rst_source_mask) >>

			pmc->soc->regs->rst_source_shift;



	return sprintf(buf, "%s\n", pmc->soc->reset_sources[rst_src]);

}



static DEVICE_ATTR_RO(reset_reason);



static ssize_t reset_level_show(struct device *dev,

			struct device_attribute *attr, char *buf)

{

	u32 value, rst_lvl;



	value = tegra_pmc_readl(pmc->soc->regs->rst_status);

	rst_lvl = (value & pmc->soc->regs->rst_level_mask) >>

			pmc->soc->regs->rst_level_shift;



	return sprintf(buf, "%s\n", pmc->soc->reset_levels[rst_lvl]);

}



static DEVICE_ATTR_RO(reset_level);



static void tegra_pmc_reset_sysfs_init(struct tegra_pmc *pmc)

{

	struct device *dev = pmc->dev;

	int err = 0;



	if (pmc->soc->reset_sources) {

		err = device_create_file(dev, &dev_attr_reset_reason);

		if (err < 0)

			dev_warn(dev,

				"failed to create attr \"reset_reason\": %d\n",

				err);

	}



	if (pmc->soc->reset_levels) {

		err = device_create_file(dev, &dev_attr_reset_level);

		if (err < 0)

			dev_warn(dev,

				"failed to create attr \"reset_level\": %d\n",

				err);

	}

}



static int tegra_pmc_probe(struct platform_device *pdev)

{

	void __iomem *base;
@@ -1596,6 +1687,8 @@ static int tegra_pmc_probe(struct platform_device *pdev) 


	tegra_pmc_init_tsense_reset(pmc);



	tegra_pmc_reset_sysfs_init(pmc);



	if (IS_ENABLED(CONFIG_DEBUG_FS)) {

		err = tegra_powergate_debugfs_init();

		if (err < 0)
@@ -1662,6 +1755,11 @@ static const struct tegra_pmc_regs tegra20_pmc_regs = { 
	.dpd_status = 0x1bc,

	.dpd2_req = 0x1c0,

	.dpd2_status = 0x1c4,

	.rst_status = 0x1b4,

	.rst_source_shift = 0x0,

	.rst_source_mask = 0x7,

	.rst_level_shift = 0x0,

	.rst_level_mask = 0x0,

};



static void tegra20_pmc_init(struct tegra_pmc *pmc)
@@ -1719,6 +1817,10 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = { 
	.regs = &tegra20_pmc_regs,

	.init = tegra20_pmc_init,

	.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,

	.reset_sources = NULL,

	.num_reset_sources = 0,

	.reset_levels = NULL,

	.num_reset_levels = 0,

};



static const char * const tegra30_powergates[] = {
@@ -1760,6 +1862,10 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = { 
	.regs = &tegra20_pmc_regs,

	.init = tegra20_pmc_init,

	.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,

	.reset_sources = tegra30_reset_sources,

	.num_reset_sources = 5,

	.reset_levels = NULL,

	.num_reset_levels = 0,

};



static const char * const tegra114_powergates[] = {
@@ -1805,6 +1911,10 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = { 
	.regs = &tegra20_pmc_regs,

	.init = tegra20_pmc_init,

	.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,

	.reset_sources = tegra30_reset_sources,

	.num_reset_sources = 5,

	.reset_levels = NULL,

	.num_reset_levels = 0,

};



static const char * const tegra124_powergates[] = {
@@ -1910,6 +2020,10 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = { 
	.regs = &tegra20_pmc_regs,

	.init = tegra20_pmc_init,

	.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,

	.reset_sources = tegra30_reset_sources,

	.num_reset_sources = 5,

	.reset_levels = NULL,

	.num_reset_levels = 0,

};



static const char * const tegra210_powergates[] = {
@@ -2011,6 +2125,10 @@ static const struct tegra_pmc_soc tegra210_pmc_soc = { 
	.regs = &tegra20_pmc_regs,

	.init = tegra20_pmc_init,

	.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,

	.reset_sources = tegra30_reset_sources,

	.num_reset_sources = 5,

	.reset_levels = NULL,

	.num_reset_levels = 0,

};



#define TEGRA186_IO_PAD_TABLE(_pad)					     \
@@ -2068,6 +2186,11 @@ static const struct tegra_pmc_regs tegra186_pmc_regs = { 
	.dpd_status = 0x78,

	.dpd2_req = 0x7c,

	.dpd2_status = 0x80,

	.rst_status = 0x70,

	.rst_source_shift = 0x2,

	.rst_source_mask = 0x3C,

	.rst_level_shift = 0x0,

	.rst_level_mask = 0x3,

};



static void tegra186_pmc_setup_irq_polarity(struct tegra_pmc *pmc,
@@ -2120,6 +2243,10 @@ static const struct tegra_pmc_soc tegra186_pmc_soc = { 
	.regs = &tegra186_pmc_regs,

	.init = NULL,

	.setup_irq_polarity = tegra186_pmc_setup_irq_polarity,

	.reset_sources = tegra186_reset_sources,

	.num_reset_sources = 14,

	.reset_levels = tegra186_reset_levels,

	.num_reset_levels = 3,

};



static const struct of_device_id tegra_pmc_match[] = {