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![Andy Shevchenko](/assets/img/avatar_default.png)
GPIO library does copy the of_node from the parent device of the GPIO chip, there is no need to repeat this in the individual drivers. Remove these assignment all at once. For the details one may look into the of_gpio_dev_init() implementation. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20211214125855.33207-1-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
598 lines
15 KiB
C
598 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Pinctrl driver for the Wondermedia SoC's
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*
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* Copyright (c) 2013 Tony Prisk <linux@prisktech.co.nz>
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*/
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#include <linux/err.h>
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#include <linux/gpio/driver.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/pinctrl/machine.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/pinctrl.h>
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#include <linux/pinctrl/pinmux.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "pinctrl-wmt.h"
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static inline void wmt_setbits(struct wmt_pinctrl_data *data, u32 reg,
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u32 mask)
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{
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u32 val;
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val = readl_relaxed(data->base + reg);
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val |= mask;
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writel_relaxed(val, data->base + reg);
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}
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static inline void wmt_clearbits(struct wmt_pinctrl_data *data, u32 reg,
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u32 mask)
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{
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u32 val;
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val = readl_relaxed(data->base + reg);
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val &= ~mask;
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writel_relaxed(val, data->base + reg);
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}
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enum wmt_func_sel {
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WMT_FSEL_GPIO_IN = 0,
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WMT_FSEL_GPIO_OUT = 1,
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WMT_FSEL_ALT = 2,
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WMT_FSEL_COUNT = 3,
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};
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static const char * const wmt_functions[WMT_FSEL_COUNT] = {
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[WMT_FSEL_GPIO_IN] = "gpio_in",
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[WMT_FSEL_GPIO_OUT] = "gpio_out",
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[WMT_FSEL_ALT] = "alt",
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};
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static int wmt_pmx_get_functions_count(struct pinctrl_dev *pctldev)
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{
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return WMT_FSEL_COUNT;
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}
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static const char *wmt_pmx_get_function_name(struct pinctrl_dev *pctldev,
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unsigned selector)
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{
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return wmt_functions[selector];
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}
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static int wmt_pmx_get_function_groups(struct pinctrl_dev *pctldev,
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unsigned selector,
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const char * const **groups,
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unsigned * const num_groups)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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/* every pin does every function */
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*groups = data->groups;
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*num_groups = data->ngroups;
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return 0;
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}
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static int wmt_set_pinmux(struct wmt_pinctrl_data *data, unsigned func,
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unsigned pin)
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{
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u32 bank = WMT_BANK_FROM_PIN(pin);
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u32 bit = WMT_BIT_FROM_PIN(pin);
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u32 reg_en = data->banks[bank].reg_en;
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u32 reg_dir = data->banks[bank].reg_dir;
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if (reg_dir == NO_REG) {
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dev_err(data->dev, "pin:%d no direction register defined\n",
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pin);
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return -EINVAL;
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}
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/*
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* If reg_en == NO_REG, we assume it is a dedicated GPIO and cannot be
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* disabled (as on VT8500) and that no alternate function is available.
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*/
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switch (func) {
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case WMT_FSEL_GPIO_IN:
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if (reg_en != NO_REG)
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wmt_setbits(data, reg_en, BIT(bit));
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wmt_clearbits(data, reg_dir, BIT(bit));
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break;
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case WMT_FSEL_GPIO_OUT:
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if (reg_en != NO_REG)
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wmt_setbits(data, reg_en, BIT(bit));
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wmt_setbits(data, reg_dir, BIT(bit));
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break;
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case WMT_FSEL_ALT:
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if (reg_en == NO_REG) {
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dev_err(data->dev, "pin:%d no alt function available\n",
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pin);
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return -EINVAL;
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}
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wmt_clearbits(data, reg_en, BIT(bit));
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}
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return 0;
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}
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static int wmt_pmx_set_mux(struct pinctrl_dev *pctldev,
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unsigned func_selector,
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unsigned group_selector)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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u32 pinnum = data->pins[group_selector].number;
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return wmt_set_pinmux(data, func_selector, pinnum);
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}
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static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned offset)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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/* disable by setting GPIO_IN */
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wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset);
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}
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static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned offset,
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bool input)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT),
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offset);
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return 0;
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}
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static const struct pinmux_ops wmt_pinmux_ops = {
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.get_functions_count = wmt_pmx_get_functions_count,
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.get_function_name = wmt_pmx_get_function_name,
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.get_function_groups = wmt_pmx_get_function_groups,
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.set_mux = wmt_pmx_set_mux,
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.gpio_disable_free = wmt_pmx_gpio_disable_free,
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.gpio_set_direction = wmt_pmx_gpio_set_direction,
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};
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static int wmt_get_groups_count(struct pinctrl_dev *pctldev)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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return data->ngroups;
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}
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static const char *wmt_get_group_name(struct pinctrl_dev *pctldev,
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unsigned selector)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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return data->groups[selector];
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}
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static int wmt_get_group_pins(struct pinctrl_dev *pctldev,
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unsigned selector,
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const unsigned **pins,
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unsigned *num_pins)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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*pins = &data->pins[selector].number;
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*num_pins = 1;
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return 0;
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}
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static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin)
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{
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int i;
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for (i = 0; i < data->npins; i++) {
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if (data->pins[i].number == pin)
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return i;
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}
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return -EINVAL;
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}
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static int wmt_pctl_dt_node_to_map_func(struct wmt_pinctrl_data *data,
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struct device_node *np,
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u32 pin, u32 fnum,
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struct pinctrl_map **maps)
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{
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int group;
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struct pinctrl_map *map = *maps;
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if (fnum >= ARRAY_SIZE(wmt_functions)) {
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dev_err(data->dev, "invalid wm,function %d\n", fnum);
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return -EINVAL;
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}
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group = wmt_pctl_find_group_by_pin(data, pin);
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if (group < 0) {
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dev_err(data->dev, "unable to match pin %d to group\n", pin);
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return group;
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}
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map->type = PIN_MAP_TYPE_MUX_GROUP;
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map->data.mux.group = data->groups[group];
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map->data.mux.function = wmt_functions[fnum];
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(*maps)++;
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return 0;
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}
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static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data,
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struct device_node *np,
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u32 pin, u32 pull,
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struct pinctrl_map **maps)
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{
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int group;
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unsigned long *configs;
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struct pinctrl_map *map = *maps;
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if (pull > 2) {
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dev_err(data->dev, "invalid wm,pull %d\n", pull);
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return -EINVAL;
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}
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group = wmt_pctl_find_group_by_pin(data, pin);
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if (group < 0) {
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dev_err(data->dev, "unable to match pin %d to group\n", pin);
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return group;
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}
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configs = kzalloc(sizeof(*configs), GFP_KERNEL);
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if (!configs)
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return -ENOMEM;
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switch (pull) {
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case 0:
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configs[0] = PIN_CONFIG_BIAS_DISABLE;
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break;
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case 1:
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configs[0] = PIN_CONFIG_BIAS_PULL_DOWN;
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break;
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case 2:
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configs[0] = PIN_CONFIG_BIAS_PULL_UP;
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break;
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default:
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configs[0] = PIN_CONFIG_BIAS_DISABLE;
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dev_err(data->dev, "invalid pull state %d - disabling\n", pull);
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}
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map->type = PIN_MAP_TYPE_CONFIGS_PIN;
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map->data.configs.group_or_pin = data->groups[group];
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map->data.configs.configs = configs;
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map->data.configs.num_configs = 1;
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(*maps)++;
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return 0;
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}
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static void wmt_pctl_dt_free_map(struct pinctrl_dev *pctldev,
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struct pinctrl_map *maps,
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unsigned num_maps)
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{
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int i;
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for (i = 0; i < num_maps; i++)
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if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
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kfree(maps[i].data.configs.configs);
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kfree(maps);
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}
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static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np,
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struct pinctrl_map **map,
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unsigned *num_maps)
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{
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struct pinctrl_map *maps, *cur_map;
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struct property *pins, *funcs, *pulls;
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u32 pin, func, pull;
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int num_pins, num_funcs, num_pulls, maps_per_pin;
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int i, err;
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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pins = of_find_property(np, "wm,pins", NULL);
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if (!pins) {
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dev_err(data->dev, "missing wmt,pins property\n");
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return -EINVAL;
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}
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funcs = of_find_property(np, "wm,function", NULL);
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pulls = of_find_property(np, "wm,pull", NULL);
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if (!funcs && !pulls) {
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dev_err(data->dev, "neither wm,function nor wm,pull specified\n");
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return -EINVAL;
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}
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/*
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* The following lines calculate how many values are defined for each
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* of the properties.
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*/
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num_pins = pins->length / sizeof(u32);
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num_funcs = funcs ? (funcs->length / sizeof(u32)) : 0;
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num_pulls = pulls ? (pulls->length / sizeof(u32)) : 0;
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if (num_funcs > 1 && num_funcs != num_pins) {
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dev_err(data->dev, "wm,function must have 1 or %d entries\n",
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num_pins);
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return -EINVAL;
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}
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if (num_pulls > 1 && num_pulls != num_pins) {
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dev_err(data->dev, "wm,pull must have 1 or %d entries\n",
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num_pins);
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return -EINVAL;
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}
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maps_per_pin = 0;
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if (num_funcs)
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maps_per_pin++;
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if (num_pulls)
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maps_per_pin++;
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cur_map = maps = kcalloc(num_pins * maps_per_pin, sizeof(*maps),
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GFP_KERNEL);
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if (!maps)
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return -ENOMEM;
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for (i = 0; i < num_pins; i++) {
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err = of_property_read_u32_index(np, "wm,pins", i, &pin);
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if (err)
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goto fail;
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if (pin >= (data->nbanks * 32)) {
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dev_err(data->dev, "invalid wm,pins value\n");
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err = -EINVAL;
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goto fail;
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}
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if (num_funcs) {
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err = of_property_read_u32_index(np, "wm,function",
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(num_funcs > 1 ? i : 0), &func);
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if (err)
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goto fail;
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err = wmt_pctl_dt_node_to_map_func(data, np, pin, func,
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&cur_map);
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if (err)
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goto fail;
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}
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if (num_pulls) {
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err = of_property_read_u32_index(np, "wm,pull",
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(num_pulls > 1 ? i : 0), &pull);
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if (err)
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goto fail;
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err = wmt_pctl_dt_node_to_map_pull(data, np, pin, pull,
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&cur_map);
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if (err)
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goto fail;
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}
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}
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*map = maps;
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*num_maps = num_pins * maps_per_pin;
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return 0;
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/*
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* The fail path removes any maps that have been allocated. The fail path is
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* only called from code after maps has been kzalloc'd. It is also safe to
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* pass 'num_pins * maps_per_pin' as the map count even though we probably
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* failed before all the mappings were read as all maps are allocated at once,
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* and configs are only allocated for .type = PIN_MAP_TYPE_CONFIGS_PIN - there
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* is no failpath where a config can be allocated without .type being set.
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*/
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fail:
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wmt_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
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return err;
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}
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static const struct pinctrl_ops wmt_pctl_ops = {
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.get_groups_count = wmt_get_groups_count,
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.get_group_name = wmt_get_group_name,
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.get_group_pins = wmt_get_group_pins,
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.dt_node_to_map = wmt_pctl_dt_node_to_map,
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.dt_free_map = wmt_pctl_dt_free_map,
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};
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static int wmt_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
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unsigned long *config)
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{
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return -ENOTSUPP;
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}
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static int wmt_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
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unsigned long *configs, unsigned num_configs)
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{
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struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
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enum pin_config_param param;
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u32 arg;
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u32 bank = WMT_BANK_FROM_PIN(pin);
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u32 bit = WMT_BIT_FROM_PIN(pin);
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u32 reg_pull_en = data->banks[bank].reg_pull_en;
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u32 reg_pull_cfg = data->banks[bank].reg_pull_cfg;
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int i;
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if ((reg_pull_en == NO_REG) || (reg_pull_cfg == NO_REG)) {
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dev_err(data->dev, "bias functions not supported on pin %d\n",
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pin);
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return -EINVAL;
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}
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for (i = 0; i < num_configs; i++) {
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param = pinconf_to_config_param(configs[i]);
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arg = pinconf_to_config_argument(configs[i]);
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if ((param == PIN_CONFIG_BIAS_PULL_DOWN) ||
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(param == PIN_CONFIG_BIAS_PULL_UP)) {
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if (arg == 0)
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param = PIN_CONFIG_BIAS_DISABLE;
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}
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switch (param) {
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case PIN_CONFIG_BIAS_DISABLE:
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wmt_clearbits(data, reg_pull_en, BIT(bit));
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break;
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case PIN_CONFIG_BIAS_PULL_DOWN:
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wmt_clearbits(data, reg_pull_cfg, BIT(bit));
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wmt_setbits(data, reg_pull_en, BIT(bit));
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break;
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case PIN_CONFIG_BIAS_PULL_UP:
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wmt_setbits(data, reg_pull_cfg, BIT(bit));
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wmt_setbits(data, reg_pull_en, BIT(bit));
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break;
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default:
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dev_err(data->dev, "unknown pinconf param\n");
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return -EINVAL;
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}
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} /* for each config */
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return 0;
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}
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static const struct pinconf_ops wmt_pinconf_ops = {
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.pin_config_get = wmt_pinconf_get,
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.pin_config_set = wmt_pinconf_set,
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};
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static struct pinctrl_desc wmt_desc = {
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.owner = THIS_MODULE,
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.name = "pinctrl-wmt",
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.pctlops = &wmt_pctl_ops,
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.pmxops = &wmt_pinmux_ops,
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.confops = &wmt_pinconf_ops,
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};
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static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
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{
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struct wmt_pinctrl_data *data = gpiochip_get_data(chip);
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u32 bank = WMT_BANK_FROM_PIN(offset);
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u32 bit = WMT_BIT_FROM_PIN(offset);
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u32 reg_dir = data->banks[bank].reg_dir;
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u32 val;
|
|
|
|
val = readl_relaxed(data->base + reg_dir);
|
|
if (val & BIT(bit))
|
|
return GPIO_LINE_DIRECTION_OUT;
|
|
|
|
return GPIO_LINE_DIRECTION_IN;
|
|
}
|
|
|
|
static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
struct wmt_pinctrl_data *data = gpiochip_get_data(chip);
|
|
u32 bank = WMT_BANK_FROM_PIN(offset);
|
|
u32 bit = WMT_BIT_FROM_PIN(offset);
|
|
u32 reg_data_in = data->banks[bank].reg_data_in;
|
|
|
|
if (reg_data_in == NO_REG) {
|
|
dev_err(data->dev, "no data in register defined\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit));
|
|
}
|
|
|
|
static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset,
|
|
int val)
|
|
{
|
|
struct wmt_pinctrl_data *data = gpiochip_get_data(chip);
|
|
u32 bank = WMT_BANK_FROM_PIN(offset);
|
|
u32 bit = WMT_BIT_FROM_PIN(offset);
|
|
u32 reg_data_out = data->banks[bank].reg_data_out;
|
|
|
|
if (reg_data_out == NO_REG) {
|
|
dev_err(data->dev, "no data out register defined\n");
|
|
return;
|
|
}
|
|
|
|
if (val)
|
|
wmt_setbits(data, reg_data_out, BIT(bit));
|
|
else
|
|
wmt_clearbits(data, reg_data_out, BIT(bit));
|
|
}
|
|
|
|
static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
|
|
{
|
|
return pinctrl_gpio_direction_input(chip->base + offset);
|
|
}
|
|
|
|
static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
|
|
int value)
|
|
{
|
|
wmt_gpio_set_value(chip, offset, value);
|
|
return pinctrl_gpio_direction_output(chip->base + offset);
|
|
}
|
|
|
|
static const struct gpio_chip wmt_gpio_chip = {
|
|
.label = "gpio-wmt",
|
|
.owner = THIS_MODULE,
|
|
.request = gpiochip_generic_request,
|
|
.free = gpiochip_generic_free,
|
|
.get_direction = wmt_gpio_get_direction,
|
|
.direction_input = wmt_gpio_direction_input,
|
|
.direction_output = wmt_gpio_direction_output,
|
|
.get = wmt_gpio_get_value,
|
|
.set = wmt_gpio_set_value,
|
|
.can_sleep = false,
|
|
};
|
|
|
|
int wmt_pinctrl_probe(struct platform_device *pdev,
|
|
struct wmt_pinctrl_data *data)
|
|
{
|
|
int err;
|
|
|
|
data->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(data->base))
|
|
return PTR_ERR(data->base);
|
|
|
|
wmt_desc.pins = data->pins;
|
|
wmt_desc.npins = data->npins;
|
|
|
|
data->gpio_chip = wmt_gpio_chip;
|
|
data->gpio_chip.parent = &pdev->dev;
|
|
data->gpio_chip.ngpio = data->nbanks * 32;
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
data->dev = &pdev->dev;
|
|
|
|
data->pctl_dev = devm_pinctrl_register(&pdev->dev, &wmt_desc, data);
|
|
if (IS_ERR(data->pctl_dev)) {
|
|
dev_err(&pdev->dev, "Failed to register pinctrl\n");
|
|
return PTR_ERR(data->pctl_dev);
|
|
}
|
|
|
|
err = gpiochip_add_data(&data->gpio_chip, data);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "could not add GPIO chip\n");
|
|
return err;
|
|
}
|
|
|
|
err = gpiochip_add_pin_range(&data->gpio_chip, dev_name(data->dev),
|
|
0, 0, data->nbanks * 32);
|
|
if (err)
|
|
goto fail_range;
|
|
|
|
dev_info(&pdev->dev, "Pin controller initialized\n");
|
|
|
|
return 0;
|
|
|
|
fail_range:
|
|
gpiochip_remove(&data->gpio_chip);
|
|
return err;
|
|
}
|