openwrtv4/target/linux/ramips/patches-4.4/0025-pinctrl-ralink-add-pinctrl-driver.patch
Felix Fietkau 1708644f19 kernel: backport MIPS changes introducing a separate IRQ stack
Prevents crashes when IRQs arrive when the current kernel stack context
already contains deeply nested function calls, e.g. when stacking lots
of network devices on top of each other

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2017-01-15 18:25:54 +01:00

524 lines
13 KiB
Diff

From 7adbe9a88c33c6e362a10b109d963b5500a21f00 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 27 Jul 2014 09:34:05 +0100
Subject: [PATCH 25/53] pinctrl: ralink: add pinctrl driver
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/Kconfig | 2 +
drivers/pinctrl/Kconfig | 5 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-rt2880.c | 474 ++++++++++++++++++++++++++++++++++++++
4 files changed, 482 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-rt2880.c
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -586,6 +586,8 @@ config RALINK
select CLKDEV_LOOKUP
select ARCH_HAS_RESET_CONTROLLER
select RESET_CONTROLLER
+ select PINCTRL
+ select PINCTRL_RT2880
config SGI_IP22
bool "SGI IP22 (Indy/Indigo2)"
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -114,6 +114,11 @@ config PINCTRL_LPC18XX
help
Pinctrl driver for NXP LPC18xx/43xx System Control Unit (SCU).
+config PINCTRL_RT2880
+ bool
+ depends on RALINK
+ select PINMUX
+
config PINCTRL_FALCON
bool
depends on SOC_FALCON
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_PINCTRL_MESON) += meson/
obj-$(CONFIG_PINCTRL_PALMAS) += pinctrl-palmas.o
obj-$(CONFIG_PINCTRL_PISTACHIO) += pinctrl-pistachio.o
obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
+obj-$(CONFIG_PINCTRL_RT2880) += pinctrl-rt2880.o
obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
obj-$(CONFIG_PINCTRL_SIRF) += sirf/
obj-$(CONFIG_PINCTRL_TEGRA) += pinctrl-tegra.o
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-rt2880.c
@@ -0,0 +1,472 @@
+/*
+ * linux/drivers/pinctrl/pinctrl-rt2880.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * publishhed by the Free Software Foundation.
+ *
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/machine.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+#include <asm/mach-ralink/pinmux.h>
+#include <asm/mach-ralink/mt7620.h>
+
+#include "core.h"
+
+#define SYSC_REG_GPIO_MODE 0x60
+#define SYSC_REG_GPIO_MODE2 0x64
+
+struct rt2880_priv {
+ struct device *dev;
+
+ struct pinctrl_pin_desc *pads;
+ struct pinctrl_desc *desc;
+
+ struct rt2880_pmx_func **func;
+ int func_count;
+
+ struct rt2880_pmx_group *groups;
+ const char **group_names;
+ int group_count;
+
+ uint8_t *gpio;
+ int max_pins;
+};
+
+static int rt2880_get_group_count(struct pinctrl_dev *pctrldev)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ return p->group_count;
+}
+
+static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
+ unsigned group)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ if (group >= p->group_count)
+ return NULL;
+
+ return p->group_names[group];
+}
+
+static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,
+ unsigned group,
+ const unsigned **pins,
+ unsigned *num_pins)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ if (group >= p->group_count)
+ return -EINVAL;
+
+ *pins = p->groups[group].func[0].pins;
+ *num_pins = p->groups[group].func[0].pin_count;
+
+ return 0;
+}
+
+static void rt2880_pinctrl_dt_free_map(struct pinctrl_dev *pctrldev,
+ struct pinctrl_map *map, unsigned num_maps)
+{
+ int i;
+
+ for (i = 0; i < num_maps; i++)
+ if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN ||
+ map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
+ kfree(map[i].data.configs.configs);
+ kfree(map);
+}
+
+static void rt2880_pinctrl_pin_dbg_show(struct pinctrl_dev *pctrldev,
+ struct seq_file *s,
+ unsigned offset)
+{
+ seq_printf(s, "ralink pio");
+}
+
+static void rt2880_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctrldev,
+ struct device_node *np,
+ struct pinctrl_map **map)
+{
+ const char *function;
+ int func = of_property_read_string(np, "ralink,function", &function);
+ int grps = of_property_count_strings(np, "ralink,group");
+ int i;
+
+ if (func || !grps)
+ return;
+
+ for (i = 0; i < grps; i++) {
+ const char *group;
+
+ of_property_read_string_index(np, "ralink,group", i, &group);
+
+ (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
+ (*map)->name = function;
+ (*map)->data.mux.group = group;
+ (*map)->data.mux.function = function;
+ (*map)++;
+ }
+}
+
+static int rt2880_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrldev,
+ struct device_node *np_config,
+ struct pinctrl_map **map,
+ unsigned *num_maps)
+{
+ int max_maps = 0;
+ struct pinctrl_map *tmp;
+ struct device_node *np;
+
+ for_each_child_of_node(np_config, np) {
+ int ret = of_property_count_strings(np, "ralink,group");
+
+ if (ret >= 0)
+ max_maps += ret;
+ }
+
+ if (!max_maps)
+ return max_maps;
+
+ *map = kzalloc(max_maps * sizeof(struct pinctrl_map), GFP_KERNEL);
+ if (!*map)
+ return -ENOMEM;
+
+ tmp = *map;
+
+ for_each_child_of_node(np_config, np)
+ rt2880_pinctrl_dt_subnode_to_map(pctrldev, np, &tmp);
+ *num_maps = max_maps;
+
+ return 0;
+}
+
+static const struct pinctrl_ops rt2880_pctrl_ops = {
+ .get_groups_count = rt2880_get_group_count,
+ .get_group_name = rt2880_get_group_name,
+ .get_group_pins = rt2880_get_group_pins,
+ .pin_dbg_show = rt2880_pinctrl_pin_dbg_show,
+ .dt_node_to_map = rt2880_pinctrl_dt_node_to_map,
+ .dt_free_map = rt2880_pinctrl_dt_free_map,
+};
+
+static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ return p->func_count;
+}
+
+static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev,
+ unsigned func)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ return p->func[func]->name;
+}
+
+static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
+ unsigned func,
+ const char * const **groups,
+ unsigned * const num_groups)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ if (p->func[func]->group_count == 1)
+ *groups = &p->group_names[p->func[func]->groups[0]];
+ else
+ *groups = p->group_names;
+
+ *num_groups = p->func[func]->group_count;
+
+ return 0;
+}
+
+static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev,
+ unsigned func,
+ unsigned group)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+ u32 mode = 0;
+ u32 reg = SYSC_REG_GPIO_MODE;
+ int i;
+ int shift;
+
+ /* dont allow double use */
+ if (p->groups[group].enabled) {
+ dev_err(p->dev, "%s is already enabled\n", p->groups[group].name);
+ return -EBUSY;
+ }
+
+ p->groups[group].enabled = 1;
+ p->func[func]->enabled = 1;
+
+ shift = p->groups[group].shift;
+ if (shift >= 32) {
+ shift -= 32;
+ reg = SYSC_REG_GPIO_MODE2;
+ }
+ mode = rt_sysc_r32(reg);
+ mode &= ~(p->groups[group].mask << shift);
+
+ /* mark the pins as gpio */
+ for (i = 0; i < p->groups[group].func[0].pin_count; i++)
+ p->gpio[p->groups[group].func[0].pins[i]] = 1;
+
+ /* function 0 is gpio and needs special handling */
+ if (func == 0) {
+ mode |= p->groups[group].gpio << shift;
+ } else {
+ for (i = 0; i < p->func[func]->pin_count; i++)
+ p->gpio[p->func[func]->pins[i]] = 0;
+ mode |= p->func[func]->value << shift;
+ }
+ rt_sysc_w32(mode, reg);
+
+ return 0;
+}
+
+static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
+ struct pinctrl_gpio_range *range,
+ unsigned pin)
+{
+ struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
+
+ if (!p->gpio[pin]) {
+ dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct pinmux_ops rt2880_pmx_group_ops = {
+ .get_functions_count = rt2880_pmx_func_count,
+ .get_function_name = rt2880_pmx_func_name,
+ .get_function_groups = rt2880_pmx_group_get_groups,
+ .set_mux = rt2880_pmx_group_enable,
+ .gpio_request_enable = rt2880_pmx_group_gpio_request_enable,
+};
+
+static struct pinctrl_desc rt2880_pctrl_desc = {
+ .owner = THIS_MODULE,
+ .name = "rt2880-pinmux",
+ .pctlops = &rt2880_pctrl_ops,
+ .pmxops = &rt2880_pmx_group_ops,
+};
+
+static struct rt2880_pmx_func gpio_func = {
+ .name = "gpio",
+};
+
+static int rt2880_pinmux_index(struct rt2880_priv *p)
+{
+ struct rt2880_pmx_func **f;
+ struct rt2880_pmx_group *mux = p->groups;
+ int i, j, c = 0;
+
+ /* count the mux functions */
+ while (mux->name) {
+ p->group_count++;
+ mux++;
+ }
+
+ /* allocate the group names array needed by the gpio function */
+ p->group_names = devm_kzalloc(p->dev, sizeof(char *) * p->group_count, GFP_KERNEL);
+ if (!p->group_names)
+ return -1;
+
+ for (i = 0; i < p->group_count; i++) {
+ p->group_names[i] = p->groups[i].name;
+ p->func_count += p->groups[i].func_count;
+ }
+
+ /* we have a dummy function[0] for gpio */
+ p->func_count++;
+
+ /* allocate our function and group mapping index buffers */
+ f = p->func = devm_kzalloc(p->dev, sizeof(struct rt2880_pmx_func) * p->func_count, GFP_KERNEL);
+ gpio_func.groups = devm_kzalloc(p->dev, sizeof(int) * p->group_count, GFP_KERNEL);
+ if (!f || !gpio_func.groups)
+ return -1;
+
+ /* add a backpointer to the function so it knows its group */
+ gpio_func.group_count = p->group_count;
+ for (i = 0; i < gpio_func.group_count; i++)
+ gpio_func.groups[i] = i;
+
+ f[c] = &gpio_func;
+ c++;
+
+ /* add remaining functions */
+ for (i = 0; i < p->group_count; i++) {
+ for (j = 0; j < p->groups[i].func_count; j++) {
+ f[c] = &p->groups[i].func[j];
+ f[c]->groups = devm_kzalloc(p->dev, sizeof(int), GFP_KERNEL);
+ f[c]->groups[0] = i;
+ f[c]->group_count = 1;
+ c++;
+ }
+ }
+ return 0;
+}
+
+static int rt2880_pinmux_pins(struct rt2880_priv *p)
+{
+ int i, j;
+
+ /* loop over the functions and initialize the pins array. also work out the highest pin used */
+ for (i = 0; i < p->func_count; i++) {
+ int pin;
+
+ if (!p->func[i]->pin_count)
+ continue;
+
+ p->func[i]->pins = devm_kzalloc(p->dev, sizeof(int) * p->func[i]->pin_count, GFP_KERNEL);
+ for (j = 0; j < p->func[i]->pin_count; j++)
+ p->func[i]->pins[j] = p->func[i]->pin_first + j;
+
+ pin = p->func[i]->pin_first + p->func[i]->pin_count;
+ if (pin > p->max_pins)
+ p->max_pins = pin;
+ }
+
+ /* the buffer that tells us which pins are gpio */
+ p->gpio = devm_kzalloc(p->dev,sizeof(uint8_t) * p->max_pins,
+ GFP_KERNEL);
+ /* the pads needed to tell pinctrl about our pins */
+ p->pads = devm_kzalloc(p->dev,
+ sizeof(struct pinctrl_pin_desc) * p->max_pins,
+ GFP_KERNEL);
+ if (!p->pads || !p->gpio ) {
+ dev_err(p->dev, "Failed to allocate gpio data\n");
+ return -ENOMEM;
+ }
+
+ memset(p->gpio, 1, sizeof(uint8_t) * p->max_pins);
+ for (i = 0; i < p->func_count; i++) {
+ if (!p->func[i]->pin_count)
+ continue;
+
+ for (j = 0; j < p->func[i]->pin_count; j++)
+ p->gpio[p->func[i]->pins[j]] = 0;
+ }
+
+ /* pin 0 is always a gpio */
+ p->gpio[0] = 1;
+
+ /* set the pads */
+ for (i = 0; i < p->max_pins; i++) {
+ /* strlen("ioXY") + 1 = 5 */
+ char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
+
+ if (!name) {
+ dev_err(p->dev, "Failed to allocate pad name\n");
+ return -ENOMEM;
+ }
+ snprintf(name, 5, "io%d", i);
+ p->pads[i].number = i;
+ p->pads[i].name = name;
+ }
+ p->desc->pins = p->pads;
+ p->desc->npins = p->max_pins;
+
+ return 0;
+}
+
+static int rt2880_pinmux_probe(struct platform_device *pdev)
+{
+ struct rt2880_priv *p;
+ struct pinctrl_dev *dev;
+ struct device_node *np;
+
+ if (!rt2880_pinmux_data)
+ return -ENOSYS;
+
+ /* setup the private data */
+ p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ p->dev = &pdev->dev;
+ p->desc = &rt2880_pctrl_desc;
+ p->groups = rt2880_pinmux_data;
+ platform_set_drvdata(pdev, p);
+
+ /* init the device */
+ if (rt2880_pinmux_index(p)) {
+ dev_err(&pdev->dev, "failed to load index\n");
+ return -EINVAL;
+ }
+ if (rt2880_pinmux_pins(p)) {
+ dev_err(&pdev->dev, "failed to load pins\n");
+ return -EINVAL;
+ }
+ dev = pinctrl_register(p->desc, &pdev->dev, p);
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ /* finalize by adding gpio ranges for enables gpio controllers */
+ for_each_compatible_node(np, NULL, "ralink,rt2880-gpio") {
+ const __be32 *ngpio, *gpiobase;
+ struct pinctrl_gpio_range *range;
+ char *name;
+
+ if (!of_device_is_available(np))
+ continue;
+
+ ngpio = of_get_property(np, "ralink,num-gpios", NULL);
+ gpiobase = of_get_property(np, "ralink,gpio-base", NULL);
+ if (!ngpio || !gpiobase) {
+ dev_err(&pdev->dev, "failed to load chip info\n");
+ return -EINVAL;
+ }
+
+ range = devm_kzalloc(p->dev, sizeof(struct pinctrl_gpio_range) + 4, GFP_KERNEL);
+ range->name = name = (char *) &range[1];
+ sprintf(name, "pio");
+ range->npins = __be32_to_cpu(*ngpio);
+ range->base = __be32_to_cpu(*gpiobase);
+ range->pin_base = range->base;
+ pinctrl_add_gpio_range(dev, range);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id rt2880_pinmux_match[] = {
+ { .compatible = "ralink,rt2880-pinmux" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rt2880_pinmux_match);
+
+static struct platform_driver rt2880_pinmux_driver = {
+ .probe = rt2880_pinmux_probe,
+ .driver = {
+ .name = "rt2880-pinmux",
+ .owner = THIS_MODULE,
+ .of_match_table = rt2880_pinmux_match,
+ },
+};
+
+int __init rt2880_pinmux_init(void)
+{
+ return platform_driver_register(&rt2880_pinmux_driver);
+}
+
+core_initcall_sync(rt2880_pinmux_init);