From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/pinctrl/ralink/pinctrl-ralink.c | 351 ++++++++++++++++++++++++++++++++ 1 file changed, 351 insertions(+) create mode 100644 drivers/pinctrl/ralink/pinctrl-ralink.c (limited to 'drivers/pinctrl/ralink/pinctrl-ralink.c') diff --git a/drivers/pinctrl/ralink/pinctrl-ralink.c b/drivers/pinctrl/ralink/pinctrl-ralink.c new file mode 100644 index 000000000..770862f45 --- /dev/null +++ b/drivers/pinctrl/ralink/pinctrl-ralink.c @@ -0,0 +1,351 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013 John Crispin + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "pinctrl-ralink.h" +#include "../core.h" +#include "../pinctrl-utils.h" + +#define SYSC_REG_GPIO_MODE 0x60 +#define SYSC_REG_GPIO_MODE2 0x64 + +struct ralink_priv { + struct device *dev; + + struct pinctrl_pin_desc *pads; + struct pinctrl_desc *desc; + + struct ralink_pmx_func **func; + int func_count; + + struct ralink_pmx_group *groups; + const char **group_names; + int group_count; + + u8 *gpio; + int max_pins; +}; + +static int ralink_get_group_count(struct pinctrl_dev *pctrldev) +{ + struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return p->group_count; +} + +static const char *ralink_get_group_name(struct pinctrl_dev *pctrldev, + unsigned int group) +{ + struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return (group >= p->group_count) ? NULL : p->group_names[group]; +} + +static int ralink_get_group_pins(struct pinctrl_dev *pctrldev, + unsigned int group, + const unsigned int **pins, + unsigned int *num_pins) +{ + struct ralink_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 ralink_pctrl_ops = { + .get_groups_count = ralink_get_group_count, + .get_group_name = ralink_get_group_name, + .get_group_pins = ralink_get_group_pins, + .dt_node_to_map = pinconf_generic_dt_node_to_map_all, + .dt_free_map = pinconf_generic_dt_free_map, +}; + +static int ralink_pmx_func_count(struct pinctrl_dev *pctrldev) +{ + struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return p->func_count; +} + +static const char *ralink_pmx_func_name(struct pinctrl_dev *pctrldev, + unsigned int func) +{ + struct ralink_priv *p = pinctrl_dev_get_drvdata(pctrldev); + + return p->func[func]->name; +} + +static int ralink_pmx_group_get_groups(struct pinctrl_dev *pctrldev, + unsigned int func, + const char * const **groups, + unsigned int * const num_groups) +{ + struct ralink_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 ralink_pmx_group_enable(struct pinctrl_dev *pctrldev, + unsigned int func, unsigned int group) +{ + struct ralink_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 0; + } + + 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 ralink_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev, + struct pinctrl_gpio_range *range, + unsigned int pin) +{ + struct ralink_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 ralink_pmx_group_ops = { + .get_functions_count = ralink_pmx_func_count, + .get_function_name = ralink_pmx_func_name, + .get_function_groups = ralink_pmx_group_get_groups, + .set_mux = ralink_pmx_group_enable, + .gpio_request_enable = ralink_pmx_group_gpio_request_enable, +}; + +static struct pinctrl_desc ralink_pctrl_desc = { + .owner = THIS_MODULE, + .name = "ralink-pinctrl", + .pctlops = &ralink_pctrl_ops, + .pmxops = &ralink_pmx_group_ops, +}; + +static struct ralink_pmx_func gpio_func = { + .name = "gpio", +}; + +static int ralink_pinctrl_index(struct ralink_priv *p) +{ + struct ralink_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 -ENOMEM; + + 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 */ + p->func = devm_kcalloc(p->dev, p->func_count, + sizeof(*p->func), GFP_KERNEL); + gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int), + GFP_KERNEL); + if (!p->func || !gpio_func.groups) + return -ENOMEM; + + /* 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; + + p->func[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++) { + p->func[c] = &p->groups[i].func[j]; + p->func[c]->groups = devm_kzalloc(p->dev, sizeof(int), + GFP_KERNEL); + if (!p->func[c]->groups) + return -ENOMEM; + p->func[c]->groups[0] = i; + p->func[c]->group_count = 1; + c++; + } + } + return 0; +} + +static int ralink_pinctrl_pins(struct ralink_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); + if (!p->func[i]->pins) + return -ENOMEM; + 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) + 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; +} + +int ralink_pinctrl_init(struct platform_device *pdev, + struct ralink_pmx_group *data) +{ + struct ralink_priv *p; + struct pinctrl_dev *dev; + int err; + + if (!data) + return -ENOTSUPP; + + /* setup the private data */ + p = devm_kzalloc(&pdev->dev, sizeof(struct ralink_priv), GFP_KERNEL); + if (!p) + return -ENOMEM; + + p->dev = &pdev->dev; + p->desc = &ralink_pctrl_desc; + p->groups = data; + platform_set_drvdata(pdev, p); + + /* init the device */ + err = ralink_pinctrl_index(p); + if (err) { + dev_err(&pdev->dev, "failed to load index\n"); + return err; + } + + err = ralink_pinctrl_pins(p); + if (err) { + dev_err(&pdev->dev, "failed to load pins\n"); + return err; + } + dev = pinctrl_register(p->desc, &pdev->dev, p); + + return PTR_ERR_OR_ZERO(dev); +} -- cgit v1.2.3