371 lines
8.7 KiB
C
371 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/pinctrl/machine.h>
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#include <asm/mach-ralink/ralink_regs.h>
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#include <asm/mach-ralink/pinmux.h>
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#include <asm/mach-ralink/mt7620.h>
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#include "../core.h"
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#include "../pinctrl-utils.h"
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#define SYSC_REG_GPIO_MODE 0x60
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#define SYSC_REG_GPIO_MODE2 0x64
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struct rt2880_priv {
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struct device *dev;
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struct pinctrl_pin_desc *pads;
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struct pinctrl_desc *desc;
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struct rt2880_pmx_func **func;
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int func_count;
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struct rt2880_pmx_group *groups;
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const char **group_names;
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int group_count;
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u8 *gpio;
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int max_pins;
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};
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static int rt2880_get_group_count(struct pinctrl_dev *pctrldev)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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return p->group_count;
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}
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static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
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unsigned int group)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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return (group >= p->group_count) ? NULL : p->group_names[group];
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}
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static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,
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unsigned int group,
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const unsigned int **pins,
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unsigned int *num_pins)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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if (group >= p->group_count)
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return -EINVAL;
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*pins = p->groups[group].func[0].pins;
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*num_pins = p->groups[group].func[0].pin_count;
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return 0;
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}
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static const struct pinctrl_ops rt2880_pctrl_ops = {
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.get_groups_count = rt2880_get_group_count,
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.get_group_name = rt2880_get_group_name,
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.get_group_pins = rt2880_get_group_pins,
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.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
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.dt_free_map = pinconf_generic_dt_free_map,
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};
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static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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return p->func_count;
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}
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static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev,
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unsigned int func)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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return p->func[func]->name;
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}
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static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
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unsigned int func,
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const char * const **groups,
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unsigned int * const num_groups)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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if (p->func[func]->group_count == 1)
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*groups = &p->group_names[p->func[func]->groups[0]];
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else
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*groups = p->group_names;
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*num_groups = p->func[func]->group_count;
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return 0;
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}
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static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev,
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unsigned int func, unsigned int group)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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u32 mode = 0;
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u32 reg = SYSC_REG_GPIO_MODE;
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int i;
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int shift;
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/* dont allow double use */
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if (p->groups[group].enabled) {
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dev_err(p->dev, "%s is already enabled\n",
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p->groups[group].name);
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return -EBUSY;
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}
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p->groups[group].enabled = 1;
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p->func[func]->enabled = 1;
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shift = p->groups[group].shift;
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if (shift >= 32) {
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shift -= 32;
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reg = SYSC_REG_GPIO_MODE2;
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}
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mode = rt_sysc_r32(reg);
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mode &= ~(p->groups[group].mask << shift);
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/* mark the pins as gpio */
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for (i = 0; i < p->groups[group].func[0].pin_count; i++)
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p->gpio[p->groups[group].func[0].pins[i]] = 1;
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/* function 0 is gpio and needs special handling */
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if (func == 0) {
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mode |= p->groups[group].gpio << shift;
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} else {
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for (i = 0; i < p->func[func]->pin_count; i++)
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p->gpio[p->func[func]->pins[i]] = 0;
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mode |= p->func[func]->value << shift;
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}
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rt_sysc_w32(mode, reg);
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return 0;
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}
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static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
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struct pinctrl_gpio_range *range,
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unsigned int pin)
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{
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struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
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if (!p->gpio[pin]) {
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dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
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return -EINVAL;
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}
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return 0;
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}
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static const struct pinmux_ops rt2880_pmx_group_ops = {
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.get_functions_count = rt2880_pmx_func_count,
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.get_function_name = rt2880_pmx_func_name,
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.get_function_groups = rt2880_pmx_group_get_groups,
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.set_mux = rt2880_pmx_group_enable,
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.gpio_request_enable = rt2880_pmx_group_gpio_request_enable,
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};
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static struct pinctrl_desc rt2880_pctrl_desc = {
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.owner = THIS_MODULE,
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.name = "rt2880-pinmux",
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.pctlops = &rt2880_pctrl_ops,
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.pmxops = &rt2880_pmx_group_ops,
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};
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static struct rt2880_pmx_func gpio_func = {
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.name = "gpio",
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};
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static int rt2880_pinmux_index(struct rt2880_priv *p)
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{
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struct rt2880_pmx_func **f;
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struct rt2880_pmx_group *mux = p->groups;
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int i, j, c = 0;
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/* count the mux functions */
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while (mux->name) {
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p->group_count++;
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mux++;
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}
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/* allocate the group names array needed by the gpio function */
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p->group_names = devm_kcalloc(p->dev, p->group_count,
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sizeof(char *), GFP_KERNEL);
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if (!p->group_names)
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return -1;
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for (i = 0; i < p->group_count; i++) {
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p->group_names[i] = p->groups[i].name;
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p->func_count += p->groups[i].func_count;
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}
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/* we have a dummy function[0] for gpio */
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p->func_count++;
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/* allocate our function and group mapping index buffers */
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f = p->func = devm_kcalloc(p->dev,
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p->func_count,
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sizeof(*p->func),
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GFP_KERNEL);
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gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
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GFP_KERNEL);
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if (!f || !gpio_func.groups)
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return -1;
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/* add a backpointer to the function so it knows its group */
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gpio_func.group_count = p->group_count;
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for (i = 0; i < gpio_func.group_count; i++)
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gpio_func.groups[i] = i;
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f[c] = &gpio_func;
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c++;
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/* add remaining functions */
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for (i = 0; i < p->group_count; i++) {
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for (j = 0; j < p->groups[i].func_count; j++) {
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f[c] = &p->groups[i].func[j];
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f[c]->groups = devm_kzalloc(p->dev, sizeof(int),
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GFP_KERNEL);
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f[c]->groups[0] = i;
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f[c]->group_count = 1;
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c++;
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}
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}
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return 0;
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}
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static int rt2880_pinmux_pins(struct rt2880_priv *p)
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{
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int i, j;
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/*
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* loop over the functions and initialize the pins array.
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* also work out the highest pin used.
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*/
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for (i = 0; i < p->func_count; i++) {
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int pin;
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if (!p->func[i]->pin_count)
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continue;
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p->func[i]->pins = devm_kcalloc(p->dev,
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p->func[i]->pin_count,
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sizeof(int),
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GFP_KERNEL);
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for (j = 0; j < p->func[i]->pin_count; j++)
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p->func[i]->pins[j] = p->func[i]->pin_first + j;
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pin = p->func[i]->pin_first + p->func[i]->pin_count;
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if (pin > p->max_pins)
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p->max_pins = pin;
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}
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/* the buffer that tells us which pins are gpio */
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p->gpio = devm_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL);
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/* the pads needed to tell pinctrl about our pins */
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p->pads = devm_kcalloc(p->dev, p->max_pins,
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sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
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if (!p->pads || !p->gpio) {
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dev_err(p->dev, "Failed to allocate gpio data\n");
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return -ENOMEM;
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}
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memset(p->gpio, 1, sizeof(u8) * p->max_pins);
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for (i = 0; i < p->func_count; i++) {
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if (!p->func[i]->pin_count)
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continue;
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for (j = 0; j < p->func[i]->pin_count; j++)
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p->gpio[p->func[i]->pins[j]] = 0;
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}
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/* pin 0 is always a gpio */
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p->gpio[0] = 1;
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/* set the pads */
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for (i = 0; i < p->max_pins; i++) {
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/* strlen("ioXY") + 1 = 5 */
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char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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snprintf(name, 5, "io%d", i);
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p->pads[i].number = i;
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p->pads[i].name = name;
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}
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p->desc->pins = p->pads;
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p->desc->npins = p->max_pins;
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return 0;
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}
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static int rt2880_pinmux_probe(struct platform_device *pdev)
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{
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struct rt2880_priv *p;
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struct pinctrl_dev *dev;
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if (!rt2880_pinmux_data)
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return -ENOTSUPP;
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/* setup the private data */
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p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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p->dev = &pdev->dev;
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p->desc = &rt2880_pctrl_desc;
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p->groups = rt2880_pinmux_data;
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platform_set_drvdata(pdev, p);
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/* init the device */
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if (rt2880_pinmux_index(p)) {
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dev_err(&pdev->dev, "failed to load index\n");
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return -EINVAL;
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}
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if (rt2880_pinmux_pins(p)) {
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dev_err(&pdev->dev, "failed to load pins\n");
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return -EINVAL;
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}
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dev = pinctrl_register(p->desc, &pdev->dev, p);
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if (IS_ERR(dev))
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return PTR_ERR(dev);
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return 0;
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}
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static const struct of_device_id rt2880_pinmux_match[] = {
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{ .compatible = "ralink,rt2880-pinmux" },
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{},
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};
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MODULE_DEVICE_TABLE(of, rt2880_pinmux_match);
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static struct platform_driver rt2880_pinmux_driver = {
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.probe = rt2880_pinmux_probe,
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.driver = {
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.name = "rt2880-pinmux",
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.of_match_table = rt2880_pinmux_match,
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},
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};
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int __init rt2880_pinmux_init(void)
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{
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return platform_driver_register(&rt2880_pinmux_driver);
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}
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core_initcall_sync(rt2880_pinmux_init);
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