pinctrl-tegra.c
/*
* 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, ®, &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, ®, &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);