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>

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index d7163de125d83c8bb077f09172603d0b64d1cc31..ab719fa901503df738f36336fc9cf2f89a189c46 100644 (file)
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -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,