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path: root/drivers/pinctrl/pinctrl-tegra.c
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Diffstat (limited to 'drivers/pinctrl/pinctrl-tegra.c')
-rw-r--r--drivers/pinctrl/pinctrl-tegra.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-tegra.c b/drivers/pinctrl/pinctrl-tegra.c
new file mode 100644
index 00000000000..9b329688120
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-tegra.c
@@ -0,0 +1,559 @@
+/*
+ * Driver for the NVIDIA Tegra pinmux
+ *
+ * Copyright (c) 2011, 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
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+
+#include <mach/pinconf-tegra.h>
+
+#include "pinctrl-tegra.h"
+
+#define DRIVER_NAME "tegra-pinmux-disabled"
+
+struct tegra_pmx {
+ struct device *dev;
+ struct pinctrl_dev *pctl;
+
+ const struct tegra_pinctrl_soc_data *soc;
+
+ int nbanks;
+ void __iomem **regs;
+};
+
+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(val, pmx->regs[bank] + reg);
+}
+
+static int tegra_pinctrl_list_groups(struct pinctrl_dev *pctldev,
+ unsigned group)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (group >= pmx->soc->ngroups)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const char *tegra_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned group)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (group >= pmx->soc->ngroups)
+ return NULL;
+
+ 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);
+
+ if (group >= pmx->soc->ngroups)
+ return -EINVAL;
+
+ *pins = pmx->soc->groups[group].pins;
+ *num_pins = pmx->soc->groups[group].npins;
+
+ return 0;
+}
+
+static void tegra_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s,
+ unsigned offset)
+{
+ seq_printf(s, " " DRIVER_NAME);
+}
+
+static struct pinctrl_ops tegra_pinctrl_ops = {
+ .list_groups = tegra_pinctrl_list_groups,
+ .get_group_name = tegra_pinctrl_get_group_name,
+ .get_group_pins = tegra_pinctrl_get_group_pins,
+ .pin_dbg_show = tegra_pinctrl_pin_dbg_show,
+};
+
+static int tegra_pinctrl_list_funcs(struct pinctrl_dev *pctldev,
+ unsigned function)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (function >= pmx->soc->nfunctions)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const char *tegra_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
+ unsigned function)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+ if (function >= pmx->soc->nfunctions)
+ return NULL;
+
+ 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);
+
+ if (function >= pmx->soc->nfunctions)
+ return -EINVAL;
+
+ *groups = pmx->soc->functions[function].groups;
+ *num_groups = pmx->soc->functions[function].ngroups;
+
+ return 0;
+}
+
+static int tegra_pinctrl_enable(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;
+
+ if (group >= pmx->soc->ngroups)
+ return -EINVAL;
+ g = &pmx->soc->groups[group];
+
+ if (g->mux_reg < 0)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(g->funcs); i++) {
+ if (g->funcs[i] == function)
+ break;
+ }
+ if (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 void tegra_pinctrl_disable(struct pinctrl_dev *pctldev,
+ unsigned function, unsigned group)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_pingroup *g;
+ u32 val;
+
+ if (group >= pmx->soc->ngroups)
+ return;
+ g = &pmx->soc->groups[group];
+
+ if (g->mux_reg < 0)
+ return;
+
+ val = pmx_readl(pmx, g->mux_bank, g->mux_reg);
+ val &= ~(0x3 << g->mux_bit);
+ val |= g->func_safe << g->mux_bit;
+ pmx_writel(pmx, val, g->mux_bank, g->mux_reg);
+}
+
+static struct pinmux_ops tegra_pinmux_ops = {
+ .list_functions = tegra_pinctrl_list_funcs,
+ .get_function_name = tegra_pinctrl_get_func_name,
+ .get_function_groups = tegra_pinctrl_get_func_groups,
+ .enable = tegra_pinctrl_enable,
+ .disable = tegra_pinctrl_disable,
+};
+
+static int tegra_pinconf_reg(struct tegra_pmx *pmx,
+ const struct tegra_pingroup *g,
+ enum tegra_pinconf_param param,
+ s8 *bank, s16 *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->einput_bank;
+ *reg = g->einput_reg;
+ *bit = g->einput_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_OPEN_DRAIN:
+ *bank = g->odrain_bank;
+ *reg = g->odrain_reg;
+ *bit = g->odrain_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_LOCK:
+ *bank = g->lock_bank;
+ *reg = g->lock_reg;
+ *bit = g->lock_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_IORESET:
+ *bank = g->ioreset_bank;
+ *reg = g->ioreset_reg;
+ *bit = g->ioreset_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE:
+ *bank = g->drv_bank;
+ *reg = g->drv_reg;
+ *bit = g->hsm_bit;
+ *width = 1;
+ break;
+ case TEGRA_PINCONF_PARAM_SCHMITT:
+ *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 = 1;
+ 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;
+ default:
+ dev_err(pmx->dev, "Invalid config param %04x\n", param);
+ return -ENOTSUPP;
+ }
+
+ if (*reg < 0) {
+ dev_err(pmx->dev,
+ "Config param %04x not supported on group %s\n",
+ param, g->name);
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static int tegra_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long *config)
+{
+ return -ENOTSUPP;
+}
+
+static int tegra_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned pin, unsigned long config)
+{
+ 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;
+ s16 reg;
+ u32 val, mask;
+
+ if (group >= pmx->soc->ngroups)
+ return -EINVAL;
+ g = &pmx->soc->groups[group];
+
+ ret = tegra_pinconf_reg(pmx, g, param, &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 config)
+{
+ struct tegra_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ enum tegra_pinconf_param param = TEGRA_PINCONF_UNPACK_PARAM(config);
+ u16 arg = TEGRA_PINCONF_UNPACK_ARG(config);
+ const struct tegra_pingroup *g;
+ int ret;
+ s8 bank, bit, width;
+ s16 reg;
+ u32 val, mask;
+
+ if (group >= pmx->soc->ngroups)
+ return -EINVAL;
+ g = &pmx->soc->groups[group];
+
+ ret = tegra_pinconf_reg(pmx, g, param, &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)
+ 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)
+ return -EINVAL;
+
+ /* Update register */
+ val &= ~(mask << bit);
+ val |= arg << bit;
+ pmx_writel(pmx, val, bank, reg);
+
+ return 0;
+}
+
+static void tegra_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned offset)
+{
+}
+
+static void tegra_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned selector)
+{
+}
+
+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,
+ .pin_config_dbg_show = tegra_pinconf_dbg_show,
+ .pin_config_group_dbg_show = tegra_pinconf_group_dbg_show,
+};
+
+static struct pinctrl_gpio_range tegra_pinctrl_gpio_range = {
+ .name = "Tegra GPIOs",
+ .id = 0,
+ .base = 0,
+};
+
+static struct pinctrl_desc tegra_pinctrl_desc = {
+ .name = DRIVER_NAME,
+ .pctlops = &tegra_pinctrl_ops,
+ .pmxops = &tegra_pinmux_ops,
+ .confops = &tegra_pinconf_ops,
+ .owner = THIS_MODULE,
+};
+
+static struct of_device_id tegra_pinctrl_of_match[] __devinitdata = {
+#ifdef CONFIG_PINCTRL_TEGRA20
+ {
+ .compatible = "nvidia,tegra20-pinmux-disabled",
+ .data = tegra20_pinctrl_init,
+ },
+#endif
+#ifdef CONFIG_PINCTRL_TEGRA30
+ {
+ .compatible = "nvidia,tegra30-pinmux-disabled",
+ .data = tegra30_pinctrl_init,
+ },
+#endif
+ {},
+};
+
+static int __devinit tegra_pinctrl_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ tegra_pinctrl_soc_initf initf = NULL;
+ struct tegra_pmx *pmx;
+ struct resource *res;
+ int i;
+
+ match = of_match_device(tegra_pinctrl_of_match, &pdev->dev);
+ if (match)
+ initf = (tegra_pinctrl_soc_initf)match->data;
+#ifdef CONFIG_PINCTRL_TEGRA20
+ if (!initf)
+ initf = tegra20_pinctrl_init;
+#endif
+ if (!initf) {
+ dev_err(&pdev->dev,
+ "Could not determine SoC-specific init func\n");
+ return -EINVAL;
+ }
+
+ pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
+ if (!pmx) {
+ dev_err(&pdev->dev, "Can't alloc tegra_pmx\n");
+ return -ENOMEM;
+ }
+ pmx->dev = &pdev->dev;
+
+ (*initf)(&pmx->soc);
+
+ tegra_pinctrl_gpio_range.npins = pmx->soc->ngpios;
+ 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;
+ }
+ pmx->nbanks = i;
+
+ pmx->regs = devm_kzalloc(&pdev->dev, pmx->nbanks * sizeof(*pmx->regs),
+ GFP_KERNEL);
+ if (!pmx->regs) {
+ dev_err(&pdev->dev, "Can't alloc regs pointer\n");
+ return -ENODEV;
+ }
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res) {
+ dev_err(&pdev->dev, "Missing MEM resource\n");
+ return -ENODEV;
+ }
+
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res),
+ dev_name(&pdev->dev))) {
+ dev_err(&pdev->dev,
+ "Couldn't request MEM resource %d\n", i);
+ return -ENODEV;
+ }
+
+ pmx->regs[i] = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!pmx->regs[i]) {
+ dev_err(&pdev->dev, "Couldn't ioremap regs %d\n", i);
+ return -ENODEV;
+ }
+ }
+
+ pmx->pctl = pinctrl_register(&tegra_pinctrl_desc, &pdev->dev, pmx);
+ if (IS_ERR(pmx->pctl)) {
+ dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
+ return PTR_ERR(pmx->pctl);
+ }
+
+ 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;
+}
+
+static int __devexit tegra_pinctrl_remove(struct platform_device *pdev)
+{
+ struct tegra_pmx *pmx = platform_get_drvdata(pdev);
+
+ pinctrl_remove_gpio_range(pmx->pctl, &tegra_pinctrl_gpio_range);
+ pinctrl_unregister(pmx->pctl);
+
+ return 0;
+}
+
+static struct platform_driver tegra_pinctrl_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = tegra_pinctrl_of_match,
+ },
+ .probe = tegra_pinctrl_probe,
+ .remove = __devexit_p(tegra_pinctrl_remove),
+};
+
+static int __init tegra_pinctrl_init(void)
+{
+ return platform_driver_register(&tegra_pinctrl_driver);
+}
+arch_initcall(tegra_pinctrl_init);
+
+static void __exit tegra_pinctrl_exit(void)
+{
+ platform_driver_unregister(&tegra_pinctrl_driver);
+}
+module_exit(tegra_pinctrl_exit);
+
+MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra pinctrl driver");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, tegra_pinctrl_of_match);