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-rw-r--r--drivers/pinctrl/tegra/pinctrl-tegra.c879
1 files changed, 879 insertions, 0 deletions
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
new file mode 100644
index 000000000..50bd26a30
--- /dev/null
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
@@ -0,0 +1,879 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the NVIDIA Tegra pinmux
+ *
+ * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Derived from code:
+ * Copyright (C) 2010 Google, Inc.
+ * Copyright (C) 2010 NVIDIA Corporation
+ * Copyright (C) 2009-2011 ST-Ericsson AB
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/slab.h>
+
+#include "../core.h"
+#include "../pinctrl-utils.h"
+#include "pinctrl-tegra.h"
+
+static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
+{
+ return readl(pmx->regs[bank] + reg);
+}
+
+static inline void pmx_writel(struct tegra_pmx *pmx, u32 val, u32 bank, u32 reg)
+{
+ writel_relaxed(val, pmx->regs[bank] + reg);
+ /* make sure pinmux register write completed */
+ pmx_readl(pmx, bank, reg);
+}
+
+static int tegra_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pmx->soc->ngroups;
+}
+
+static const char *tegra_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned group)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pmx->soc->groups[group].name;
+}
+
+static int tegra_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned group,
+ const unsigned **pins,
+ unsigned *num_pins)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = pmx->soc->groups[group].pins;
+ *num_pins = pmx->soc->groups[group].npins;
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void tegra_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned offset)
+{
+ seq_printf(s, " %s", dev_name(pctldev->dev));
+}
+#endif
+
+static const struct cfg_param {
+ const char *property;
+ enum tegra_pinconf_param param;
+} cfg_params[] = {
+ {"nvidia,pull", TEGRA_PINCONF_PARAM_PULL},
+ {"nvidia,tristate", TEGRA_PINCONF_PARAM_TRISTATE},
+ {"nvidia,enable-input", TEGRA_PINCONF_PARAM_ENABLE_INPUT},
+ {"nvidia,open-drain", TEGRA_PINCONF_PARAM_OPEN_DRAIN},
+ {"nvidia,lock", TEGRA_PINCONF_PARAM_LOCK},
+ {"nvidia,io-reset", TEGRA_PINCONF_PARAM_IORESET},
+ {"nvidia,rcv-sel", TEGRA_PINCONF_PARAM_RCV_SEL},
+ {"nvidia,io-hv", TEGRA_PINCONF_PARAM_RCV_SEL},
+ {"nvidia,high-speed-mode", TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE},
+ {"nvidia,schmitt", TEGRA_PINCONF_PARAM_SCHMITT},
+ {"nvidia,low-power-mode", TEGRA_PINCONF_PARAM_LOW_POWER_MODE},
+ {"nvidia,pull-down-strength", TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH},
+ {"nvidia,pull-up-strength", TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH},
+ {"nvidia,slew-rate-falling", TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING},
+ {"nvidia,slew-rate-rising", TEGRA_PINCONF_PARAM_SLEW_RATE_RISING},
+ {"nvidia,drive-type", TEGRA_PINCONF_PARAM_DRIVE_TYPE},
+};
+
+static int tegra_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np,
+ struct pinctrl_map **map,
+ unsigned *reserved_maps,
+ unsigned *num_maps)
+{
+ struct device *dev = pctldev->dev;
+ int ret, i;
+ const char *function;
+ u32 val;
+ unsigned long config;
+ unsigned long *configs = NULL;
+ unsigned num_configs = 0;
+ unsigned reserve;
+ struct property *prop;
+ const char *group;
+
+ ret = of_property_read_string(np, "nvidia,function", &function);
+ if (ret < 0) {
+ /* EINVAL=missing, which is fine since it's optional */
+ if (ret != -EINVAL)
+ dev_err(dev,
+ "could not parse property nvidia,function\n");
+ function = NULL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
+ ret = of_property_read_u32(np, cfg_params[i].property, &val);
+ if (!ret) {
+ config = TEGRA_PINCONF_PACK(cfg_params[i].param, val);
+ ret = pinctrl_utils_add_config(pctldev, &configs,
+ &num_configs, config);
+ if (ret < 0)
+ goto exit;
+ /* EINVAL=missing, which is fine since it's optional */
+ } else if (ret != -EINVAL) {
+ dev_err(dev, "could not parse property %s\n",
+ cfg_params[i].property);
+ }
+ }
+
+ reserve = 0;
+ if (function != NULL)
+ reserve++;
+ if (num_configs)
+ reserve++;
+ ret = of_property_count_strings(np, "nvidia,pins");
+ if (ret < 0) {
+ dev_err(dev, "could not parse property nvidia,pins\n");
+ goto exit;
+ }
+ reserve *= ret;
+
+ ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
+ num_maps, reserve);
+ if (ret < 0)
+ goto exit;
+
+ of_property_for_each_string(np, "nvidia,pins", prop, group) {
+ if (function) {
+ ret = pinctrl_utils_add_map_mux(pctldev, map,
+ reserved_maps, num_maps, group,
+ function);
+ if (ret < 0)
+ goto exit;
+ }
+
+ if (num_configs) {
+ ret = pinctrl_utils_add_map_configs(pctldev, map,
+ reserved_maps, num_maps, group,
+ configs, num_configs,
+ PIN_MAP_TYPE_CONFIGS_GROUP);
+ if (ret < 0)
+ goto exit;
+ }
+ }
+
+ ret = 0;
+
+exit:
+ kfree(configs);
+ return ret;
+}
+
+static int tegra_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map,
+ unsigned *num_maps)
+{
+ unsigned reserved_maps;
+ struct device_node *np;
+ int ret;
+
+ reserved_maps = 0;
+ *map = NULL;
+ *num_maps = 0;
+
+ for_each_child_of_node(np_config, np) {
+ ret = tegra_pinctrl_dt_subnode_to_map(pctldev, np, map,
+ &reserved_maps, num_maps);
+ if (ret < 0) {
+ pinctrl_utils_free_map(pctldev, *map,
+ *num_maps);
+ of_node_put(np);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct pinctrl_ops tegra_pinctrl_ops = {
+ .get_groups_count = tegra_pinctrl_get_groups_count,
+ .get_group_name = tegra_pinctrl_get_group_name,
+ .get_group_pins = tegra_pinctrl_get_group_pins,
+#ifdef CONFIG_DEBUG_FS
+ .pin_dbg_show = tegra_pinctrl_pin_dbg_show,
+#endif
+ .dt_node_to_map = tegra_pinctrl_dt_node_to_map,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+static int tegra_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pmx->soc->nfunctions;
+}
+
+static const char *tegra_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
+ unsigned function)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ return pmx->soc->functions[function].name;
+}
+
+static int tegra_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
+ unsigned function,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = pmx->soc->functions[function].groups;
+ *num_groups = pmx->soc->functions[function].ngroups;
+
+ return 0;
+}
+
+static int tegra_pinctrl_set_mux(struct pinctrl_dev *pctldev,
+ unsigned function,
+ unsigned group)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_pingroup *g;
+ int i;
+ u32 val;
+
+ g = &pmx->soc->groups[group];
+
+ if (WARN_ON(g->mux_reg < 0))
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
+ if (g->funcs[i] == function)
+ break;
+ }
+ if (WARN_ON(i == ARRAY_SIZE(g->funcs)))
+ return -EINVAL;
+
+ val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
+ val &= ~(0x3 << g->mux_bit);
+ val |= i << g->mux_bit;
+ pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
+
+ return 0;
+}
+
+static const struct tegra_pingroup *tegra_pinctrl_get_group(struct pinctrl_dev *pctldev,
+ unsigned int offset)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ unsigned int group, num_pins, j;
+ const unsigned int *pins;
+ int ret;
+
+ for (group = 0; group < pmx->soc->ngroups; ++group) {
+ ret = tegra_pinctrl_get_group_pins(pctldev, group, &pins, &num_pins);
+ if (ret < 0)
+ continue;
+ for (j = 0; j < num_pins; j++) {
+ if (offset == pins[j])
+ return &pmx->soc->groups[group];
+ }
+ }
+
+ dev_err(pctldev->dev, "Pingroup not found for pin %u\n", offset);
+ return NULL;
+}
+
+static int tegra_pinctrl_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int offset)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_pingroup *group;
+ u32 value;
+
+ if (!pmx->soc->sfsel_in_mux)
+ return 0;
+
+ group = tegra_pinctrl_get_group(pctldev, offset);
+
+ if (!group)
+ return -EINVAL;
+
+ if (group->mux_reg < 0 || group->sfsel_bit < 0)
+ return -EINVAL;
+
+ value = pmx_readl(pmx, group->mux_bank, group->mux_reg);
+ value &= ~BIT(group->sfsel_bit);
+ pmx_writel(pmx, value, group->mux_bank, group->mux_reg);
+
+ return 0;
+}
+
+static void tegra_pinctrl_gpio_disable_free(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int offset)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_pingroup *group;
+ u32 value;
+
+ if (!pmx->soc->sfsel_in_mux)
+ return;
+
+ group = tegra_pinctrl_get_group(pctldev, offset);
+
+ if (!group)
+ return;
+
+ if (group->mux_reg < 0 || group->sfsel_bit < 0)
+ return;
+
+ value = pmx_readl(pmx, group->mux_bank, group->mux_reg);
+ value |= BIT(group->sfsel_bit);
+ pmx_writel(pmx, value, group->mux_bank, group->mux_reg);
+}
+
+static const struct pinmux_ops tegra_pinmux_ops = {
+ .get_functions_count = tegra_pinctrl_get_funcs_count,
+ .get_function_name = tegra_pinctrl_get_func_name,
+ .get_function_groups = tegra_pinctrl_get_func_groups,
+ .set_mux = tegra_pinctrl_set_mux,
+ .gpio_request_enable = tegra_pinctrl_gpio_request_enable,
+ .gpio_disable_free = tegra_pinctrl_gpio_disable_free,
+};
+
+static int tegra_pinconf_reg(struct tegra_pmx *pmx,
+ const struct tegra_pingroup *g,
+ enum tegra_pinconf_param param,
+ bool report_err,
+ s8 *bank, s32 *reg, s8 *bit, s8 *width)
+{
+ switch (param) {
+ case TEGRA_PINCONF_PARAM_PULL:
+ *bank = g->pupd_bank;
+ *reg = g->pupd_reg;
+ *bit = g->pupd_bit;
+ *width = 2;
+ break;
+ case TEGRA_PINCONF_PARAM_TRISTATE:
+ *bank = g->tri_bank;
+ *reg = g->tri_reg;
+ *bit = g->tri_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_ENABLE_INPUT:
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ *bit = g->einput_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_OPEN_DRAIN:
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ *bit = g->odrain_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_LOCK:
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ *bit = g->lock_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_IORESET:
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ *bit = g->ioreset_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_RCV_SEL:
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ *bit = g->rcv_sel_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE:
+ if (pmx->soc->hsm_in_mux) {
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ } else {
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ }
+ *bit = g->hsm_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_SCHMITT:
+ if (pmx->soc->schmitt_in_mux) {
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ } else {
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ }
+ *bit = g->schmitt_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_LOW_POWER_MODE:
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ *bit = g->lpmd_bit;
+ *width = 2;
+ break;
+ case TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH:
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ *bit = g->drvdn_bit;
+ *width = g->drvdn_width;
+ break;
+ case TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH:
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ *bit = g->drvup_bit;
+ *width = g->drvup_width;
+ break;
+ case TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING:
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ *bit = g->slwf_bit;
+ *width = g->slwf_width;
+ break;
+ case TEGRA_PINCONF_PARAM_SLEW_RATE_RISING:
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ *bit = g->slwr_bit;
+ *width = g->slwr_width;
+ break;
+ case TEGRA_PINCONF_PARAM_DRIVE_TYPE:
+ if (pmx->soc->drvtype_in_mux) {
+ *bank = g->mux_bank;
+ *reg = g->mux_reg;
+ } else {
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ }
+ *bit = g->drvtype_bit;
+ *width = 2;
+ break;
+ default:
+ dev_err(pmx->dev, "Invalid config param %04x\n", param);
+ return -ENOTSUPP;
+ }
+
+ if (*reg < 0 || *bit < 0) {
+ if (report_err) {
+ const char *prop = "unknown";
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
+ if (cfg_params[i].param == param) {
+ prop = cfg_params[i].property;
+ break;
+ }
+ }
+
+ dev_err(pmx->dev,
+ "Config param %04x (%s) not supported on group %s\n",
+ param, prop, g->name);
+ }
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static int tegra_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long *config)
+{
+ dev_err(pctldev->dev, "pin_config_get op not supported\n");
+ return -ENOTSUPP;
+}
+
+static int tegra_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long *configs,
+ unsigned num_configs)
+{
+ dev_err(pctldev->dev, "pin_config_set op not supported\n");
+ return -ENOTSUPP;
+}
+
+static int tegra_pinconf_group_get(struct pinctrl_dev *pctldev,
+ unsigned group, unsigned long *config)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(*config);
+ u16 arg;
+ const struct tegra_pingroup *g;
+ int ret;
+ s8 bank, bit, width;
+ s32 reg;
+ u32 val, mask;
+
+ g = &pmx->soc->groups[group];
+
+ ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
+ &width);
+ if (ret < 0)
+ return ret;
+
+ val = pmx_readl(pmx, bank, reg);
+ mask = (1 << width) - 1;
+ arg = (val >> bit) & mask;
+
+ *config = TEGRA_PINCONF_PACK(param, arg);
+
+ return 0;
+}
+
+static int tegra_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned group, unsigned long *configs,
+ unsigned num_configs)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum tegra_pinconf_param param;
+ u16 arg;
+ const struct tegra_pingroup *g;
+ int ret, i;
+ s8 bank, bit, width;
+ s32 reg;
+ u32 val, mask;
+
+ g = &pmx->soc->groups[group];
+
+ for (i = 0; i < num_configs; i++) {
+ param = TEGRA_PINCONF_UNPACK_PARAM(configs[i]);
+ arg = TEGRA_PINCONF_UNPACK_ARG(configs[i]);
+
+ ret = tegra_pinconf_reg(pmx, g, param, true, &bank, &reg, &bit,
+ &width);
+ if (ret < 0)
+ return ret;
+
+ val = pmx_readl(pmx, bank, reg);
+
+ /* LOCK can't be cleared */
+ if (param == TEGRA_PINCONF_PARAM_LOCK) {
+ if ((val & BIT(bit)) && !arg) {
+ dev_err(pctldev->dev, "LOCK bit cannot be cleared\n");
+ return -EINVAL;
+ }
+ }
+
+ /* Special-case Boolean values; allow any non-zero as true */
+ if (width == 1)
+ arg = !!arg;
+
+ /* Range-check user-supplied value */
+ mask = (1 << width) - 1;
+ if (arg & ~mask) {
+ dev_err(pctldev->dev,
+ "config %lx: %x too big for %d bit register\n",
+ configs[i], arg, width);
+ return -EINVAL;
+ }
+
+ /* Update register */
+ val &= ~(mask << bit);
+ val |= arg << bit;
+ pmx_writel(pmx, val, bank, reg);
+ } /* for each config */
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void tegra_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned offset)
+{
+}
+
+static const char *strip_prefix(const char *s)
+{
+ const char *comma = strchr(s, ',');
+ if (!comma)
+ return s;
+
+ return comma + 1;
+}
+
+static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned group)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_pingroup *g;
+ int i, ret;
+ s8 bank, bit, width;
+ s32 reg;
+ u32 val;
+
+ g = &pmx->soc->groups[group];
+
+ for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
+ ret = tegra_pinconf_reg(pmx, g, cfg_params[i].param, false,
+ &bank, &reg, &bit, &width);
+ if (ret < 0)
+ continue;
+
+ val = pmx_readl(pmx, bank, reg);
+ val >>= bit;
+ val &= (1 << width) - 1;
+
+ seq_printf(s, "\n\t%s=%u",
+ strip_prefix(cfg_params[i].property), val);
+ }
+}
+
+static void tegra_pinconf_config_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned long config)
+{
+ enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(config);
+ u16 arg = TEGRA_PINCONF_UNPACK_ARG(config);
+ const char *pname = "unknown";
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
+ if (cfg_params[i].param == param) {
+ pname = cfg_params[i].property;
+ break;
+ }
+ }
+
+ seq_printf(s, "%s=%d", strip_prefix(pname), arg);
+}
+#endif
+
+static const struct pinconf_ops tegra_pinconf_ops = {
+ .pin_config_get = tegra_pinconf_get,
+ .pin_config_set = tegra_pinconf_set,
+ .pin_config_group_get = tegra_pinconf_group_get,
+ .pin_config_group_set = tegra_pinconf_group_set,
+#ifdef CONFIG_DEBUG_FS
+ .pin_config_dbg_show = tegra_pinconf_dbg_show,
+ .pin_config_group_dbg_show = tegra_pinconf_group_dbg_show,
+ .pin_config_config_dbg_show = tegra_pinconf_config_dbg_show,
+#endif
+};
+
+static struct pinctrl_gpio_range tegra_pinctrl_gpio_range = {
+ .name = "Tegra GPIOs",
+ .id = 0,
+ .base = 0,
+};
+
+static struct pinctrl_desc tegra_pinctrl_desc = {
+ .pctlops = &tegra_pinctrl_ops,
+ .pmxops = &tegra_pinmux_ops,
+ .confops = &tegra_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
+{
+ int i = 0;
+ const struct tegra_pingroup *g;
+ u32 val;
+
+ for (i = 0; i < pmx->soc->ngroups; ++i) {
+ g = &pmx->soc->groups[i];
+ if (g->parked_bitmask > 0) {
+ unsigned int bank, reg;
+
+ if (g->mux_reg != -1) {
+ bank = g->mux_bank;
+ reg = g->mux_reg;
+ } else {
+ bank = g->drv_bank;
+ reg = g->drv_reg;
+ }
+
+ val = pmx_readl(pmx, bank, reg);
+ val &= ~g->parked_bitmask;
+ pmx_writel(pmx, val, bank, reg);
+ }
+ }
+}
+
+static size_t tegra_pinctrl_get_bank_size(struct device *dev,
+ unsigned int bank_id)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, bank_id);
+
+ return resource_size(res) / 4;
+}
+
+static int tegra_pinctrl_suspend(struct device *dev)
+{
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ u32 *backup_regs = pmx->backup_regs;
+ u32 __iomem *regs;
+ size_t bank_size;
+ unsigned int i, k;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ bank_size = tegra_pinctrl_get_bank_size(dev, i);
+ regs = pmx->regs[i];
+ for (k = 0; k < bank_size; k++)
+ *backup_regs++ = readl_relaxed(regs++);
+ }
+
+ return pinctrl_force_sleep(pmx->pctl);
+}
+
+static int tegra_pinctrl_resume(struct device *dev)
+{
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ u32 *backup_regs = pmx->backup_regs;
+ u32 __iomem *regs;
+ size_t bank_size;
+ unsigned int i, k;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ bank_size = tegra_pinctrl_get_bank_size(dev, i);
+ regs = pmx->regs[i];
+ for (k = 0; k < bank_size; k++)
+ writel_relaxed(*backup_regs++, regs++);
+ }
+
+ /* flush all the prior writes */
+ readl_relaxed(pmx->regs[0]);
+ /* wait for pinctrl register read to complete */
+ rmb();
+ return 0;
+}
+
+const struct dev_pm_ops tegra_pinctrl_pm = {
+ .suspend_noirq = &tegra_pinctrl_suspend,
+ .resume_noirq = &tegra_pinctrl_resume
+};
+
+static bool tegra_pinctrl_gpio_node_has_range(struct tegra_pmx *pmx)
+{
+ struct device_node *np;
+ bool has_prop = false;
+
+ np = of_find_compatible_node(NULL, NULL, pmx->soc->gpio_compatible);
+ if (!np)
+ return has_prop;
+
+ has_prop = of_find_property(np, "gpio-ranges", NULL);
+
+ of_node_put(np);
+
+ return has_prop;
+}
+
+int tegra_pinctrl_probe(struct platform_device *pdev,
+ const struct tegra_pinctrl_soc_data *soc_data)
+{
+ struct tegra_pmx *pmx;
+ struct resource *res;
+ 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)
+ return -ENOMEM;
+
+ pmx->dev = &pdev->dev;
+ pmx->soc = soc_data;
+
+ /*
+ * Each mux group will appear in 4 functions' list of groups.
+ * This over-allocates slightly, since not all groups are mux groups.
+ */
+ pmx->group_pins = devm_kcalloc(&pdev->dev,
+ soc_data->ngroups * 4, sizeof(*pmx->group_pins),
+ GFP_KERNEL);
+ if (!pmx->group_pins)
+ return -ENOMEM;
+
+ group_pins = pmx->group_pins;
+ for (fn = 0; fn < soc_data->nfunctions; fn++) {
+ struct tegra_function *func = &soc_data->functions[fn];
+
+ func->groups = group_pins;
+
+ for (gn = 0; gn < soc_data->ngroups; gn++) {
+ const struct tegra_pingroup *g = &soc_data->groups[gn];
+
+ if (g->mux_reg == -1)
+ continue;
+
+ for (gfn = 0; gfn < 4; gfn++)
+ if (g->funcs[gfn] == fn)
+ break;
+ if (gfn == 4)
+ continue;
+
+ BUG_ON(group_pins - pmx->group_pins >=
+ soc_data->ngroups * 4);
+ *group_pins++ = g->name;
+ func->ngroups++;
+ }
+ }
+
+ tegra_pinctrl_gpio_range.npins = pmx->soc->ngpios;
+ tegra_pinctrl_desc.name = dev_name(&pdev->dev);
+ tegra_pinctrl_desc.pins = pmx->soc->pins;
+ tegra_pinctrl_desc.npins = pmx->soc->npins;
+
+ for (i = 0; ; i++) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ break;
+ backup_regs_size += resource_size(res);
+ }
+ pmx->nbanks = i;
+
+ pmx->regs = devm_kcalloc(&pdev->dev, pmx->nbanks, sizeof(*pmx->regs),
+ GFP_KERNEL);
+ if (!pmx->regs)
+ 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++) {
+ pmx->regs[i] = devm_platform_ioremap_resource(pdev, i);
+ if (IS_ERR(pmx->regs[i]))
+ return PTR_ERR(pmx->regs[i]);
+ }
+
+ pmx->pctl = devm_pinctrl_register(&pdev->dev, &tegra_pinctrl_desc, pmx);
+ if (IS_ERR(pmx->pctl)) {
+ dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
+ return PTR_ERR(pmx->pctl);
+ }
+
+ tegra_pinctrl_clear_parked_bits(pmx);
+
+ if (pmx->soc->ngpios > 0 && !tegra_pinctrl_gpio_node_has_range(pmx))
+ pinctrl_add_gpio_range(pmx->pctl, &tegra_pinctrl_gpio_range);
+
+ platform_set_drvdata(pdev, pmx);
+
+ dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 10:34:54 +0000