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599 lines
15 KiB
599 lines
15 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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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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/* |
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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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|
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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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|
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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; |
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|
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val = readl_relaxed(data->base + reg_dir); |
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if (val & BIT(bit)) |
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return GPIO_LINE_DIRECTION_OUT; |
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|
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return GPIO_LINE_DIRECTION_IN; |
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} |
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|
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static int wmt_gpio_get_value(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_data_in = data->banks[bank].reg_data_in; |
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|
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if (reg_data_in == NO_REG) { |
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dev_err(data->dev, "no data in register defined\n"); |
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return -EINVAL; |
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} |
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|
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return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit)); |
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} |
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|
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static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset, |
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int val) |
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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_data_out = data->banks[bank].reg_data_out; |
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|
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if (reg_data_out == NO_REG) { |
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dev_err(data->dev, "no data out register defined\n"); |
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return; |
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} |
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|
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if (val) |
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wmt_setbits(data, reg_data_out, BIT(bit)); |
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else |
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wmt_clearbits(data, reg_data_out, BIT(bit)); |
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} |
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|
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static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
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{ |
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return pinctrl_gpio_direction_input(chip->base + offset); |
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} |
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|
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static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
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int value) |
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{ |
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wmt_gpio_set_value(chip, offset, value); |
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return pinctrl_gpio_direction_output(chip->base + offset); |
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} |
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|
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static const struct gpio_chip wmt_gpio_chip = { |
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.label = "gpio-wmt", |
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.owner = THIS_MODULE, |
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.request = gpiochip_generic_request, |
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.free = gpiochip_generic_free, |
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.get_direction = wmt_gpio_get_direction, |
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.direction_input = wmt_gpio_direction_input, |
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.direction_output = wmt_gpio_direction_output, |
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.get = wmt_gpio_get_value, |
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.set = wmt_gpio_set_value, |
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.can_sleep = false, |
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}; |
|
|
|
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.of_node = pdev->dev.of_node; |
|
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; |
|
}
|
|
|