| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * 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/pinconf-generic.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" |
| #include "pinctrl-utils.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; |
| |
| u8 *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 int group) |
| { |
| struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev); |
| |
| return (group >= p->group_count) ? NULL : p->group_names[group]; |
| } |
| |
| static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev, |
| unsigned int group, |
| const unsigned int **pins, |
| unsigned int *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 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, |
| .dt_node_to_map = pinconf_generic_dt_node_to_map_all, |
| .dt_free_map = pinconf_generic_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 int 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 int func, |
| const char * const **groups, |
| unsigned int * 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 int func, unsigned int 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 int 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_kcalloc(p->dev, p->group_count, |
| sizeof(char *), 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_kcalloc(p->dev, |
| p->func_count, |
| sizeof(struct rt2880_pmx_func), |
| GFP_KERNEL); |
| gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int), |
| 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_kcalloc(p->dev, |
| p->func[i]->pin_count, |
| sizeof(int), |
| 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_kcalloc(p->dev, p->max_pins, sizeof(u8), GFP_KERNEL); |
| /* the pads needed to tell pinctrl about our pins */ |
| p->pads = devm_kcalloc(p->dev, p->max_pins, |
| sizeof(struct pinctrl_pin_desc), GFP_KERNEL); |
| if (!p->pads || !p->gpio) { |
| dev_err(p->dev, "Failed to allocate gpio data\n"); |
| return -ENOMEM; |
| } |
| |
| memset(p->gpio, 1, sizeof(u8) * 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) |
| 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 -ENOTSUPP; |
| |
| /* 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; |
| |
| 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(*range), GFP_KERNEL); |
| if (!range) |
| return -ENOMEM; |
| range->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", |
| .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); |