soc/tegra: pmc: Implement pad configuration via pinctrl

Register a pinctrl device and implement get and set functions for
PIN_CONFIG_LOW_POWER_MODE and PIN_CONFIG_POWER_SOURCE parameters.

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Aapo Vienamo 2018-08-10 21:08:12 +03:00 committed by Thierry Reding
parent fccf0f76ec
commit 4a37f11c8f
1 changed files with 185 additions and 2 deletions

View File

@ -33,6 +33,9 @@
#include <linux/of_address.h>
#include <linux/of_clk.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/reboot.h>
@ -164,6 +167,9 @@ struct tegra_pmc_soc {
const struct tegra_io_pad_soc *io_pads;
unsigned int num_io_pads;
const struct pinctrl_pin_desc *pin_descs;
unsigned int num_pin_descs;
const struct tegra_pmc_regs *regs;
void (*init)(struct tegra_pmc *pmc);
void (*setup_irq_polarity)(struct tegra_pmc *pmc,
@ -222,6 +228,8 @@ struct tegra_pmc {
DECLARE_BITMAP(powergates_available, TEGRA_POWERGATE_MAX);
struct mutex powergates_lock;
struct pinctrl_dev *pctl_dev;
};
static struct tegra_pmc *pmc = &(struct tegra_pmc) {
@ -1399,6 +1407,142 @@ out:
of_node_put(np);
}
static int tegra_io_pad_pinctrl_get_groups_count(struct pinctrl_dev *pctl_dev)
{
return pmc->soc->num_io_pads;
}
static const char *tegra_io_pad_pinctrl_get_group_name(
struct pinctrl_dev *pctl, unsigned int group)
{
return pmc->soc->io_pads[group].name;
}
static int tegra_io_pad_pinctrl_get_group_pins(struct pinctrl_dev *pctl_dev,
unsigned int group,
const unsigned int **pins,
unsigned int *num_pins)
{
*pins = &pmc->soc->io_pads[group].id;
*num_pins = 1;
return 0;
}
static const struct pinctrl_ops tegra_io_pad_pinctrl_ops = {
.get_groups_count = tegra_io_pad_pinctrl_get_groups_count,
.get_group_name = tegra_io_pad_pinctrl_get_group_name,
.get_group_pins = tegra_io_pad_pinctrl_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.dt_free_map = pinconf_generic_dt_free_map,
};
static int tegra_io_pad_pinconf_get(struct pinctrl_dev *pctl_dev,
unsigned int pin, unsigned long *config)
{
const struct tegra_io_pad_soc *pad = tegra_io_pad_find(pmc, pin);
enum pin_config_param param = pinconf_to_config_param(*config);
int ret;
u32 arg;
if (!pad)
return -EINVAL;
switch (param) {
case PIN_CONFIG_POWER_SOURCE:
ret = tegra_io_pad_get_voltage(pad->id);
if (ret < 0)
return ret;
arg = ret;
break;
case PIN_CONFIG_LOW_POWER_MODE:
ret = tegra_io_pad_is_powered(pad->id);
if (ret < 0)
return ret;
arg = !ret;
break;
default:
return -EINVAL;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int tegra_io_pad_pinconf_set(struct pinctrl_dev *pctl_dev,
unsigned int pin, unsigned long *configs,
unsigned int num_configs)
{
const struct tegra_io_pad_soc *pad = tegra_io_pad_find(pmc, pin);
enum pin_config_param param;
unsigned int i;
int err;
u32 arg;
if (!pad)
return -EINVAL;
for (i = 0; i < num_configs; ++i) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_LOW_POWER_MODE:
if (arg)
err = tegra_io_pad_power_disable(pad->id);
else
err = tegra_io_pad_power_enable(pad->id);
if (err)
return err;
break;
case PIN_CONFIG_POWER_SOURCE:
if (arg != TEGRA_IO_PAD_VOLTAGE_1V8 &&
arg != TEGRA_IO_PAD_VOLTAGE_3V3)
return -EINVAL;
err = tegra_io_pad_set_voltage(pad->id, arg);
if (err)
return err;
break;
default:
return -EINVAL;
}
}
return 0;
}
static const struct pinconf_ops tegra_io_pad_pinconf_ops = {
.pin_config_get = tegra_io_pad_pinconf_get,
.pin_config_set = tegra_io_pad_pinconf_set,
.is_generic = true,
};
static struct pinctrl_desc tegra_pmc_pctl_desc = {
.pctlops = &tegra_io_pad_pinctrl_ops,
.confops = &tegra_io_pad_pinconf_ops,
};
static int tegra_pmc_pinctrl_init(struct tegra_pmc *pmc)
{
int err = 0;
if (!pmc->soc->num_pin_descs)
return 0;
tegra_pmc_pctl_desc.name = dev_name(pmc->dev);
tegra_pmc_pctl_desc.pins = pmc->soc->pin_descs;
tegra_pmc_pctl_desc.npins = pmc->soc->num_pin_descs;
pmc->pctl_dev = devm_pinctrl_register(pmc->dev, &tegra_pmc_pctl_desc,
pmc);
if (IS_ERR(pmc->pctl_dev)) {
err = PTR_ERR(pmc->pctl_dev);
dev_err(pmc->dev, "unable to register pinctrl, %d\n", err);
}
return err;
}
static int tegra_pmc_probe(struct platform_device *pdev)
{
void __iomem *base;
@ -1476,18 +1620,27 @@ static int tegra_pmc_probe(struct platform_device *pdev)
err = register_restart_handler(&tegra_pmc_restart_handler);
if (err) {
debugfs_remove(pmc->debugfs);
dev_err(&pdev->dev, "unable to register restart handler, %d\n",
err);
return err;
goto cleanup_debugfs;
}
err = tegra_pmc_pinctrl_init(pmc);
if (err)
goto cleanup_restart_handler;
mutex_lock(&pmc->powergates_lock);
iounmap(pmc->base);
pmc->base = base;
mutex_unlock(&pmc->powergates_lock);
return 0;
cleanup_restart_handler:
unregister_restart_handler(&tegra_pmc_restart_handler);
cleanup_debugfs:
debugfs_remove(pmc->debugfs);
return err;
}
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM)
@ -1577,6 +1730,8 @@ static const struct tegra_pmc_soc tegra20_pmc_soc = {
.has_gpu_clamps = false,
.num_io_pads = 0,
.io_pads = NULL,
.num_pin_descs = 0,
.pin_descs = NULL,
.regs = &tegra20_pmc_regs,
.init = tegra20_pmc_init,
.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
@ -1616,6 +1771,8 @@ static const struct tegra_pmc_soc tegra30_pmc_soc = {
.has_impl_33v_pwr = false,
.num_io_pads = 0,
.io_pads = NULL,
.num_pin_descs = 0,
.pin_descs = NULL,
.regs = &tegra20_pmc_regs,
.init = tegra20_pmc_init,
.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
@ -1659,6 +1816,8 @@ static const struct tegra_pmc_soc tegra114_pmc_soc = {
.has_impl_33v_pwr = false,
.num_io_pads = 0,
.io_pads = NULL,
.num_pin_descs = 0,
.pin_descs = NULL,
.regs = &tegra20_pmc_regs,
.init = tegra20_pmc_init,
.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
@ -1705,6 +1864,12 @@ static const u8 tegra124_cpu_powergates[] = {
.name = (_name), \
})
#define TEGRA_IO_PIN_DESC(_id, _dpd, _voltage, _name) \
((struct pinctrl_pin_desc) { \
.number = (_id), \
.name = (_name) \
})
#define TEGRA124_IO_PAD_TABLE(_pad) \
/* .id .dpd .voltage .name */ \
_pad(TEGRA_IO_PAD_AUDIO, 17, UINT_MAX, "audio"), \
@ -1742,6 +1907,10 @@ static const struct tegra_io_pad_soc tegra124_io_pads[] = {
TEGRA124_IO_PAD_TABLE(TEGRA_IO_PAD)
};
static const struct pinctrl_pin_desc tegra124_pin_descs[] = {
TEGRA124_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
};
static const struct tegra_pmc_soc tegra124_pmc_soc = {
.num_powergates = ARRAY_SIZE(tegra124_powergates),
.powergates = tegra124_powergates,
@ -1752,6 +1921,8 @@ static const struct tegra_pmc_soc tegra124_pmc_soc = {
.has_impl_33v_pwr = false,
.num_io_pads = ARRAY_SIZE(tegra124_io_pads),
.io_pads = tegra124_io_pads,
.num_pin_descs = ARRAY_SIZE(tegra124_pin_descs),
.pin_descs = tegra124_pin_descs,
.regs = &tegra20_pmc_regs,
.init = tegra20_pmc_init,
.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
@ -1836,6 +2007,10 @@ static const struct tegra_io_pad_soc tegra210_io_pads[] = {
TEGRA210_IO_PAD_TABLE(TEGRA_IO_PAD)
};
static const struct pinctrl_pin_desc tegra210_pin_descs[] = {
TEGRA210_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
};
static const struct tegra_pmc_soc tegra210_pmc_soc = {
.num_powergates = ARRAY_SIZE(tegra210_powergates),
.powergates = tegra210_powergates,
@ -1847,6 +2022,8 @@ static const struct tegra_pmc_soc tegra210_pmc_soc = {
.needs_mbist_war = true,
.num_io_pads = ARRAY_SIZE(tegra210_io_pads),
.io_pads = tegra210_io_pads,
.num_pin_descs = ARRAY_SIZE(tegra210_pin_descs),
.pin_descs = tegra210_pin_descs,
.regs = &tegra20_pmc_regs,
.init = tegra20_pmc_init,
.setup_irq_polarity = tegra20_pmc_setup_irq_polarity,
@ -1897,6 +2074,10 @@ static const struct tegra_io_pad_soc tegra186_io_pads[] = {
TEGRA186_IO_PAD_TABLE(TEGRA_IO_PAD)
};
static const struct pinctrl_pin_desc tegra186_pin_descs[] = {
TEGRA186_IO_PAD_TABLE(TEGRA_IO_PIN_DESC)
};
static const struct tegra_pmc_regs tegra186_pmc_regs = {
.scratch0 = 0x2000,
.dpd_req = 0x74,
@ -1950,6 +2131,8 @@ static const struct tegra_pmc_soc tegra186_pmc_soc = {
.has_impl_33v_pwr = true,
.num_io_pads = ARRAY_SIZE(tegra186_io_pads),
.io_pads = tegra186_io_pads,
.num_pin_descs = ARRAY_SIZE(tegra186_pin_descs),
.pin_descs = tegra186_pin_descs,
.regs = &tegra186_pmc_regs,
.init = NULL,
.setup_irq_polarity = tegra186_pmc_setup_irq_polarity,