diff options
Diffstat (limited to 'drivers/pinctrl/sunxi/pinctrl-sunxi.c')
| -rw-r--r-- | drivers/pinctrl/sunxi/pinctrl-sunxi.c | 1444 |
1 files changed, 1444 insertions, 0 deletions
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c new file mode 100644 index 000000000..ff9c2758d --- /dev/null +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c @@ -0,0 +1,1444 @@ +/* + * Allwinner A1X SoCs pinctrl driver. + * + * Copyright (C) 2012 Maxime Ripard + * + * Maxime Ripard <maxime.ripard@free-electrons.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/gpio/driver.h> +#include <linux/irqdomain.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/export.h> +#include <linux/of.h> +#include <linux/of_clk.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/machine.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <dt-bindings/pinctrl/sun4i-a10.h> + +#include "../core.h" +#include "pinctrl-sunxi.h" + +static struct irq_chip sunxi_pinctrl_edge_irq_chip; +static struct irq_chip sunxi_pinctrl_level_irq_chip; + +static struct sunxi_pinctrl_group * +sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group) +{ + int i; + + for (i = 0; i < pctl->ngroups; i++) { + struct sunxi_pinctrl_group *grp = pctl->groups + i; + + if (!strcmp(grp->name, group)) + return grp; + } + + return NULL; +} + +static struct sunxi_pinctrl_function * +sunxi_pinctrl_find_function_by_name(struct sunxi_pinctrl *pctl, + const char *name) +{ + struct sunxi_pinctrl_function *func = pctl->functions; + int i; + + for (i = 0; i < pctl->nfunctions; i++) { + if (!func[i].name) + break; + + if (!strcmp(func[i].name, name)) + return func + i; + } + + return NULL; +} + +static struct sunxi_desc_function * +sunxi_pinctrl_desc_find_function_by_name(struct sunxi_pinctrl *pctl, + const char *pin_name, + const char *func_name) +{ + int i; + + for (i = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + + if (!strcmp(pin->pin.name, pin_name)) { + struct sunxi_desc_function *func = pin->functions; + + while (func->name) { + if (!strcmp(func->name, func_name) && + (!func->variant || + func->variant & pctl->variant)) + return func; + + func++; + } + } + } + + return NULL; +} + +static struct sunxi_desc_function * +sunxi_pinctrl_desc_find_function_by_pin(struct sunxi_pinctrl *pctl, + const u16 pin_num, + const char *func_name) +{ + int i; + + for (i = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + + if (pin->pin.number == pin_num) { + struct sunxi_desc_function *func = pin->functions; + + while (func->name) { + if (!strcmp(func->name, func_name)) + return func; + + func++; + } + } + } + + return NULL; +} + +static int sunxi_pctrl_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + return pctl->ngroups; +} + +static const char *sunxi_pctrl_get_group_name(struct pinctrl_dev *pctldev, + unsigned group) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + return pctl->groups[group].name; +} + +static int sunxi_pctrl_get_group_pins(struct pinctrl_dev *pctldev, + unsigned group, + const unsigned **pins, + unsigned *num_pins) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + *pins = (unsigned *)&pctl->groups[group].pin; + *num_pins = 1; + + return 0; +} + +static bool sunxi_pctrl_has_bias_prop(struct device_node *node) +{ + return of_find_property(node, "bias-pull-up", NULL) || + of_find_property(node, "bias-pull-down", NULL) || + of_find_property(node, "bias-disable", NULL) || + of_find_property(node, "allwinner,pull", NULL); +} + +static bool sunxi_pctrl_has_drive_prop(struct device_node *node) +{ + return of_find_property(node, "drive-strength", NULL) || + of_find_property(node, "allwinner,drive", NULL); +} + +static int sunxi_pctrl_parse_bias_prop(struct device_node *node) +{ + u32 val; + + /* Try the new style binding */ + if (of_find_property(node, "bias-pull-up", NULL)) + return PIN_CONFIG_BIAS_PULL_UP; + + if (of_find_property(node, "bias-pull-down", NULL)) + return PIN_CONFIG_BIAS_PULL_DOWN; + + if (of_find_property(node, "bias-disable", NULL)) + return PIN_CONFIG_BIAS_DISABLE; + + /* And fall back to the old binding */ + if (of_property_read_u32(node, "allwinner,pull", &val)) + return -EINVAL; + + switch (val) { + case SUN4I_PINCTRL_NO_PULL: + return PIN_CONFIG_BIAS_DISABLE; + case SUN4I_PINCTRL_PULL_UP: + return PIN_CONFIG_BIAS_PULL_UP; + case SUN4I_PINCTRL_PULL_DOWN: + return PIN_CONFIG_BIAS_PULL_DOWN; + } + + return -EINVAL; +} + +static int sunxi_pctrl_parse_drive_prop(struct device_node *node) +{ + u32 val; + + /* Try the new style binding */ + if (!of_property_read_u32(node, "drive-strength", &val)) { + /* We can't go below 10mA ... */ + if (val < 10) + return -EINVAL; + + /* ... and only up to 40 mA ... */ + if (val > 40) + val = 40; + + /* by steps of 10 mA */ + return rounddown(val, 10); + } + + /* And then fall back to the old binding */ + if (of_property_read_u32(node, "allwinner,drive", &val)) + return -EINVAL; + + return (val + 1) * 10; +} + +static const char *sunxi_pctrl_parse_function_prop(struct device_node *node) +{ + const char *function; + int ret; + + /* Try the generic binding */ + ret = of_property_read_string(node, "function", &function); + if (!ret) + return function; + + /* And fall back to our legacy one */ + ret = of_property_read_string(node, "allwinner,function", &function); + if (!ret) + return function; + + return NULL; +} + +static const char *sunxi_pctrl_find_pins_prop(struct device_node *node, + int *npins) +{ + int count; + + /* Try the generic binding */ + count = of_property_count_strings(node, "pins"); + if (count > 0) { + *npins = count; + return "pins"; + } + + /* And fall back to our legacy one */ + count = of_property_count_strings(node, "allwinner,pins"); + if (count > 0) { + *npins = count; + return "allwinner,pins"; + } + + return NULL; +} + +static unsigned long *sunxi_pctrl_build_pin_config(struct device_node *node, + unsigned int *len) +{ + unsigned long *pinconfig; + unsigned int configlen = 0, idx = 0; + int ret; + + if (sunxi_pctrl_has_drive_prop(node)) + configlen++; + if (sunxi_pctrl_has_bias_prop(node)) + configlen++; + + /* + * If we don't have any configuration, bail out + */ + if (!configlen) + return NULL; + + pinconfig = kcalloc(configlen, sizeof(*pinconfig), GFP_KERNEL); + if (!pinconfig) + return ERR_PTR(-ENOMEM); + + if (sunxi_pctrl_has_drive_prop(node)) { + int drive = sunxi_pctrl_parse_drive_prop(node); + if (drive < 0) { + ret = drive; + goto err_free; + } + + pinconfig[idx++] = pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH, + drive); + } + + if (sunxi_pctrl_has_bias_prop(node)) { + int pull = sunxi_pctrl_parse_bias_prop(node); + int arg = 0; + if (pull < 0) { + ret = pull; + goto err_free; + } + + if (pull != PIN_CONFIG_BIAS_DISABLE) + arg = 1; /* hardware uses weak pull resistors */ + + pinconfig[idx++] = pinconf_to_config_packed(pull, arg); + } + + + *len = configlen; + return pinconfig; + +err_free: + kfree(pinconfig); + return ERR_PTR(ret); +} + +static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *node, + struct pinctrl_map **map, + unsigned *num_maps) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + unsigned long *pinconfig; + struct property *prop; + const char *function, *pin_prop; + const char *group; + int ret, npins, nmaps, configlen = 0, i = 0; + + *map = NULL; + *num_maps = 0; + + function = sunxi_pctrl_parse_function_prop(node); + if (!function) { + dev_err(pctl->dev, "missing function property in node %s\n", + node->name); + return -EINVAL; + } + + pin_prop = sunxi_pctrl_find_pins_prop(node, &npins); + if (!pin_prop) { + dev_err(pctl->dev, "missing pins property in node %s\n", + node->name); + return -EINVAL; + } + + /* + * We have two maps for each pin: one for the function, one + * for the configuration (bias, strength, etc). + * + * We might be slightly overshooting, since we might not have + * any configuration. + */ + nmaps = npins * 2; + *map = kmalloc_array(nmaps, sizeof(struct pinctrl_map), GFP_KERNEL); + if (!*map) + return -ENOMEM; + + pinconfig = sunxi_pctrl_build_pin_config(node, &configlen); + if (IS_ERR(pinconfig)) { + ret = PTR_ERR(pinconfig); + goto err_free_map; + } + + of_property_for_each_string(node, pin_prop, prop, group) { + struct sunxi_pinctrl_group *grp = + sunxi_pinctrl_find_group_by_name(pctl, group); + + if (!grp) { + dev_err(pctl->dev, "unknown pin %s", group); + continue; + } + + if (!sunxi_pinctrl_desc_find_function_by_name(pctl, + grp->name, + function)) { + dev_err(pctl->dev, "unsupported function %s on pin %s", + function, group); + continue; + } + + (*map)[i].type = PIN_MAP_TYPE_MUX_GROUP; + (*map)[i].data.mux.group = group; + (*map)[i].data.mux.function = function; + + i++; + + if (pinconfig) { + (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP; + (*map)[i].data.configs.group_or_pin = group; + (*map)[i].data.configs.configs = pinconfig; + (*map)[i].data.configs.num_configs = configlen; + i++; + } + } + + *num_maps = i; + + /* + * We know have the number of maps we need, we can resize our + * map array + */ + *map = krealloc(*map, i * sizeof(struct pinctrl_map), GFP_KERNEL); + if (!*map) + return -ENOMEM; + + return 0; + +err_free_map: + kfree(*map); + *map = NULL; + return ret; +} + +static void sunxi_pctrl_dt_free_map(struct pinctrl_dev *pctldev, + struct pinctrl_map *map, + unsigned num_maps) +{ + int i; + + /* pin config is never in the first map */ + for (i = 1; i < num_maps; i++) { + if (map[i].type != PIN_MAP_TYPE_CONFIGS_GROUP) + continue; + + /* + * All the maps share the same pin config, + * free only the first one we find. + */ + kfree(map[i].data.configs.configs); + break; + } + + kfree(map); +} + +static const struct pinctrl_ops sunxi_pctrl_ops = { + .dt_node_to_map = sunxi_pctrl_dt_node_to_map, + .dt_free_map = sunxi_pctrl_dt_free_map, + .get_groups_count = sunxi_pctrl_get_groups_count, + .get_group_name = sunxi_pctrl_get_group_name, + .get_group_pins = sunxi_pctrl_get_group_pins, +}; + +static int sunxi_pconf_reg(unsigned pin, enum pin_config_param param, + u32 *offset, u32 *shift, u32 *mask) +{ + switch (param) { + case PIN_CONFIG_DRIVE_STRENGTH: + *offset = sunxi_dlevel_reg(pin); + *shift = sunxi_dlevel_offset(pin); + *mask = DLEVEL_PINS_MASK; + break; + + case PIN_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_BIAS_PULL_DOWN: + case PIN_CONFIG_BIAS_DISABLE: + *offset = sunxi_pull_reg(pin); + *shift = sunxi_pull_offset(pin); + *mask = PULL_PINS_MASK; + break; + + default: + return -ENOTSUPP; + } + + return 0; +} + +static int sunxi_pconf_get(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *config) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + u32 offset, shift, mask, val; + u16 arg; + int ret; + + pin -= pctl->desc->pin_base; + + ret = sunxi_pconf_reg(pin, param, &offset, &shift, &mask); + if (ret < 0) + return ret; + + val = (readl(pctl->membase + offset) >> shift) & mask; + + switch (pinconf_to_config_param(*config)) { + case PIN_CONFIG_DRIVE_STRENGTH: + arg = (val + 1) * 10; + break; + + case PIN_CONFIG_BIAS_PULL_UP: + if (val != SUN4I_PINCTRL_PULL_UP) + return -EINVAL; + arg = 1; /* hardware is weak pull-up */ + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + if (val != SUN4I_PINCTRL_PULL_DOWN) + return -EINVAL; + arg = 1; /* hardware is weak pull-down */ + break; + + case PIN_CONFIG_BIAS_DISABLE: + if (val != SUN4I_PINCTRL_NO_PULL) + return -EINVAL; + arg = 0; + break; + + default: + /* sunxi_pconf_reg should catch anything unsupported */ + WARN_ON(1); + return -ENOTSUPP; + } + + *config = pinconf_to_config_packed(param, arg); + + return 0; +} + +static int sunxi_pconf_group_get(struct pinctrl_dev *pctldev, + unsigned group, + unsigned long *config) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct sunxi_pinctrl_group *g = &pctl->groups[group]; + + /* We only support 1 pin per group. Chain it to the pin callback */ + return sunxi_pconf_get(pctldev, g->pin, config); +} + +static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev, + unsigned group, + unsigned long *configs, + unsigned num_configs) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct sunxi_pinctrl_group *g = &pctl->groups[group]; + unsigned pin = g->pin - pctl->desc->pin_base; + int i; + + for (i = 0; i < num_configs; i++) { + enum pin_config_param param; + unsigned long flags; + u32 offset, shift, mask, reg; + u32 arg, val; + int ret; + + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + ret = sunxi_pconf_reg(pin, param, &offset, &shift, &mask); + if (ret < 0) + return ret; + + switch (param) { + case PIN_CONFIG_DRIVE_STRENGTH: + if (arg < 10 || arg > 40) + return -EINVAL; + /* + * We convert from mA to what the register expects: + * 0: 10mA + * 1: 20mA + * 2: 30mA + * 3: 40mA + */ + val = arg / 10 - 1; + break; + case PIN_CONFIG_BIAS_DISABLE: + val = 0; + break; + case PIN_CONFIG_BIAS_PULL_UP: + if (arg == 0) + return -EINVAL; + val = 1; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + if (arg == 0) + return -EINVAL; + val = 2; + break; + default: + /* sunxi_pconf_reg should catch anything unsupported */ + WARN_ON(1); + return -ENOTSUPP; + } + + raw_spin_lock_irqsave(&pctl->lock, flags); + reg = readl(pctl->membase + offset); + reg &= ~(mask << shift); + writel(reg | val << shift, pctl->membase + offset); + raw_spin_unlock_irqrestore(&pctl->lock, flags); + } /* for each config */ + + return 0; +} + +static const struct pinconf_ops sunxi_pconf_ops = { + .is_generic = true, + .pin_config_get = sunxi_pconf_get, + .pin_config_group_get = sunxi_pconf_group_get, + .pin_config_group_set = sunxi_pconf_group_set, +}; + +static int sunxi_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + return pctl->nfunctions; +} + +static const char *sunxi_pmx_get_func_name(struct pinctrl_dev *pctldev, + unsigned function) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + return pctl->functions[function].name; +} + +static int sunxi_pmx_get_func_groups(struct pinctrl_dev *pctldev, + unsigned function, + const char * const **groups, + unsigned * const num_groups) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + + *groups = pctl->functions[function].groups; + *num_groups = pctl->functions[function].ngroups; + + return 0; +} + +static void sunxi_pmx_set(struct pinctrl_dev *pctldev, + unsigned pin, + u8 config) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + unsigned long flags; + u32 val, mask; + + raw_spin_lock_irqsave(&pctl->lock, flags); + + pin -= pctl->desc->pin_base; + val = readl(pctl->membase + sunxi_mux_reg(pin)); + mask = MUX_PINS_MASK << sunxi_mux_offset(pin); + writel((val & ~mask) | config << sunxi_mux_offset(pin), + pctl->membase + sunxi_mux_reg(pin)); + + raw_spin_unlock_irqrestore(&pctl->lock, flags); +} + +static int sunxi_pmx_set_mux(struct pinctrl_dev *pctldev, + unsigned function, + unsigned group) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct sunxi_pinctrl_group *g = pctl->groups + group; + struct sunxi_pinctrl_function *func = pctl->functions + function; + struct sunxi_desc_function *desc = + sunxi_pinctrl_desc_find_function_by_name(pctl, + g->name, + func->name); + + if (!desc) + return -EINVAL; + + sunxi_pmx_set(pctldev, g->pin, desc->muxval); + + return 0; +} + +static int +sunxi_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned offset, + bool input) +{ + struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); + struct sunxi_desc_function *desc; + const char *func; + + if (input) + func = "gpio_in"; + else + func = "gpio_out"; + + desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, func); + if (!desc) + return -EINVAL; + + sunxi_pmx_set(pctldev, offset, desc->muxval); + + return 0; +} + +static const struct pinmux_ops sunxi_pmx_ops = { + .get_functions_count = sunxi_pmx_get_funcs_cnt, + .get_function_name = sunxi_pmx_get_func_name, + .get_function_groups = sunxi_pmx_get_func_groups, + .set_mux = sunxi_pmx_set_mux, + .gpio_set_direction = sunxi_pmx_gpio_set_direction, + .strict = true, +}; + +static int sunxi_pinctrl_gpio_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + return pinctrl_gpio_direction_input(chip->base + offset); +} + +static int sunxi_pinctrl_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct sunxi_pinctrl *pctl = gpiochip_get_data(chip); + u32 reg = sunxi_data_reg(offset); + u8 index = sunxi_data_offset(offset); + bool set_mux = pctl->desc->irq_read_needs_mux && + gpiochip_line_is_irq(chip, offset); + u32 pin = offset + chip->base; + u32 val; + + if (set_mux) + sunxi_pmx_set(pctl->pctl_dev, pin, SUN4I_FUNC_INPUT); + + val = (readl(pctl->membase + reg) >> index) & DATA_PINS_MASK; + + if (set_mux) + sunxi_pmx_set(pctl->pctl_dev, pin, SUN4I_FUNC_IRQ); + + return !!val; +} + +static void sunxi_pinctrl_gpio_set(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct sunxi_pinctrl *pctl = gpiochip_get_data(chip); + u32 reg = sunxi_data_reg(offset); + u8 index = sunxi_data_offset(offset); + unsigned long flags; + u32 regval; + + raw_spin_lock_irqsave(&pctl->lock, flags); + + regval = readl(pctl->membase + reg); + + if (value) + regval |= BIT(index); + else + regval &= ~(BIT(index)); + + writel(regval, pctl->membase + reg); + + raw_spin_unlock_irqrestore(&pctl->lock, flags); +} + +static int sunxi_pinctrl_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + sunxi_pinctrl_gpio_set(chip, offset, value); + return pinctrl_gpio_direction_output(chip->base + offset); +} + +static int sunxi_pinctrl_gpio_of_xlate(struct gpio_chip *gc, + const struct of_phandle_args *gpiospec, + u32 *flags) +{ + int pin, base; + + base = PINS_PER_BANK * gpiospec->args[0]; + pin = base + gpiospec->args[1]; + + if (pin > gc->ngpio) + return -EINVAL; + + if (flags) + *flags = gpiospec->args[2]; + + return pin; +} + +static int sunxi_pinctrl_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct sunxi_pinctrl *pctl = gpiochip_get_data(chip); + struct sunxi_desc_function *desc; + unsigned pinnum = pctl->desc->pin_base + offset; + unsigned irqnum; + + if (offset >= chip->ngpio) + return -ENXIO; + + desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pinnum, "irq"); + if (!desc) + return -EINVAL; + + irqnum = desc->irqbank * IRQ_PER_BANK + desc->irqnum; + + dev_dbg(chip->parent, "%s: request IRQ for GPIO %d, return %d\n", + chip->label, offset + chip->base, irqnum); + + return irq_find_mapping(pctl->domain, irqnum); +} + +static int sunxi_pinctrl_irq_request_resources(struct irq_data *d) +{ + struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d); + struct sunxi_desc_function *func; + int ret; + + func = sunxi_pinctrl_desc_find_function_by_pin(pctl, + pctl->irq_array[d->hwirq], "irq"); + if (!func) + return -EINVAL; + + ret = gpiochip_lock_as_irq(pctl->chip, + pctl->irq_array[d->hwirq] - pctl->desc->pin_base); + if (ret) { + dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n", + irqd_to_hwirq(d)); + return ret; + } + + /* Change muxing to INT mode */ + sunxi_pmx_set(pctl->pctl_dev, pctl->irq_array[d->hwirq], func->muxval); + + return 0; +} + +static void sunxi_pinctrl_irq_release_resources(struct irq_data *d) +{ + struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d); + + gpiochip_unlock_as_irq(pctl->chip, + pctl->irq_array[d->hwirq] - pctl->desc->pin_base); +} + +static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d); + u32 reg = sunxi_irq_cfg_reg(pctl->desc, d->hwirq); + u8 index = sunxi_irq_cfg_offset(d->hwirq); + unsigned long flags; + u32 regval; + u8 mode; + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + mode = IRQ_EDGE_RISING; + break; + case IRQ_TYPE_EDGE_FALLING: + mode = IRQ_EDGE_FALLING; + break; + case IRQ_TYPE_EDGE_BOTH: + mode = IRQ_EDGE_BOTH; + break; + case IRQ_TYPE_LEVEL_HIGH: + mode = IRQ_LEVEL_HIGH; + break; + case IRQ_TYPE_LEVEL_LOW: + mode = IRQ_LEVEL_LOW; + break; + default: + return -EINVAL; + } + + raw_spin_lock_irqsave(&pctl->lock, flags); + + if (type & IRQ_TYPE_LEVEL_MASK) + irq_set_chip_handler_name_locked(d, &sunxi_pinctrl_level_irq_chip, + handle_fasteoi_irq, NULL); + else + irq_set_chip_handler_name_locked(d, &sunxi_pinctrl_edge_irq_chip, + handle_edge_irq, NULL); + + regval = readl(pctl->membase + reg); + regval &= ~(IRQ_CFG_IRQ_MASK << index); + writel(regval | (mode << index), pctl->membase + reg); + + raw_spin_unlock_irqrestore(&pctl->lock, flags); + + return 0; +} + +static void sunxi_pinctrl_irq_ack(struct irq_data *d) +{ + struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d); + u32 status_reg = sunxi_irq_status_reg(pctl->desc, d->hwirq); + u8 status_idx = sunxi_irq_status_offset(d->hwirq); + + /* Clear the IRQ */ + writel(1 << status_idx, pctl->membase + status_reg); +} + +static void sunxi_pinctrl_irq_mask(struct irq_data *d) +{ + struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d); + u32 reg = sunxi_irq_ctrl_reg(pctl->desc, d->hwirq); + u8 idx = sunxi_irq_ctrl_offset(d->hwirq); + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&pctl->lock, flags); + + /* Mask the IRQ */ + val = readl(pctl->membase + reg); + writel(val & ~(1 << idx), pctl->membase + reg); + + raw_spin_unlock_irqrestore(&pctl->lock, flags); +} + +static void sunxi_pinctrl_irq_unmask(struct irq_data *d) +{ + struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d); + u32 reg = sunxi_irq_ctrl_reg(pctl->desc, d->hwirq); + u8 idx = sunxi_irq_ctrl_offset(d->hwirq); + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&pctl->lock, flags); + + /* Unmask the IRQ */ + val = readl(pctl->membase + reg); + writel(val | (1 << idx), pctl->membase + reg); + + raw_spin_unlock_irqrestore(&pctl->lock, flags); +} + +static void sunxi_pinctrl_irq_ack_unmask(struct irq_data *d) +{ + sunxi_pinctrl_irq_ack(d); + sunxi_pinctrl_irq_unmask(d); +} + +static struct irq_chip sunxi_pinctrl_edge_irq_chip = { + .name = "sunxi_pio_edge", + .irq_ack = sunxi_pinctrl_irq_ack, + .irq_mask = sunxi_pinctrl_irq_mask, + .irq_unmask = sunxi_pinctrl_irq_unmask, + .irq_request_resources = sunxi_pinctrl_irq_request_resources, + .irq_release_resources = sunxi_pinctrl_irq_release_resources, + .irq_set_type = sunxi_pinctrl_irq_set_type, + .flags = IRQCHIP_SKIP_SET_WAKE, +}; + +static struct irq_chip sunxi_pinctrl_level_irq_chip = { + .name = "sunxi_pio_level", + .irq_eoi = sunxi_pinctrl_irq_ack, + .irq_mask = sunxi_pinctrl_irq_mask, + .irq_unmask = sunxi_pinctrl_irq_unmask, + /* Define irq_enable / disable to avoid spurious irqs for drivers + * using these to suppress irqs while they clear the irq source */ + .irq_enable = sunxi_pinctrl_irq_ack_unmask, + .irq_disable = sunxi_pinctrl_irq_mask, + .irq_request_resources = sunxi_pinctrl_irq_request_resources, + .irq_release_resources = sunxi_pinctrl_irq_release_resources, + .irq_set_type = sunxi_pinctrl_irq_set_type, + .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED | + IRQCHIP_EOI_IF_HANDLED, +}; + +static int sunxi_pinctrl_irq_of_xlate(struct irq_domain *d, + struct device_node *node, + const u32 *intspec, + unsigned int intsize, + unsigned long *out_hwirq, + unsigned int *out_type) +{ + struct sunxi_pinctrl *pctl = d->host_data; + struct sunxi_desc_function *desc; + int pin, base; + + if (intsize < 3) + return -EINVAL; + + base = PINS_PER_BANK * intspec[0]; + pin = pctl->desc->pin_base + base + intspec[1]; + + desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pin, "irq"); + if (!desc) + return -EINVAL; + + *out_hwirq = desc->irqbank * PINS_PER_BANK + desc->irqnum; + *out_type = intspec[2]; + + return 0; +} + +static const struct irq_domain_ops sunxi_pinctrl_irq_domain_ops = { + .xlate = sunxi_pinctrl_irq_of_xlate, +}; + +static void sunxi_pinctrl_irq_handler(struct irq_desc *desc) +{ + unsigned int irq = irq_desc_get_irq(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + struct sunxi_pinctrl *pctl = irq_desc_get_handler_data(desc); + unsigned long bank, reg, val; + + for (bank = 0; bank < pctl->desc->irq_banks; bank++) + if (irq == pctl->irq[bank]) + break; + + if (bank == pctl->desc->irq_banks) + return; + + chained_irq_enter(chip, desc); + + reg = sunxi_irq_status_reg_from_bank(pctl->desc, bank); + val = readl(pctl->membase + reg); + + if (val) { + int irqoffset; + + for_each_set_bit(irqoffset, &val, IRQ_PER_BANK) { + int pin_irq = irq_find_mapping(pctl->domain, + bank * IRQ_PER_BANK + irqoffset); + generic_handle_irq(pin_irq); + } + } + + chained_irq_exit(chip, desc); +} + +static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl, + const char *name) +{ + struct sunxi_pinctrl_function *func = pctl->functions; + + while (func->name) { + /* function already there */ + if (strcmp(func->name, name) == 0) { + func->ngroups++; + return -EEXIST; + } + func++; + } + + func->name = name; + func->ngroups = 1; + + pctl->nfunctions++; + + return 0; +} + +static int sunxi_pinctrl_build_state(struct platform_device *pdev) +{ + struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev); + void *ptr; + int i; + + /* + * Allocate groups + * + * We assume that the number of groups is the number of pins + * given in the data array. + + * This will not always be true, since some pins might not be + * available in the current variant, but fortunately for us, + * this means that the number of pins is the maximum group + * number we will ever see. + */ + pctl->groups = devm_kcalloc(&pdev->dev, + pctl->desc->npins, sizeof(*pctl->groups), + GFP_KERNEL); + if (!pctl->groups) + return -ENOMEM; + + for (i = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + struct sunxi_pinctrl_group *group = pctl->groups + pctl->ngroups; + + if (pin->variant && !(pctl->variant & pin->variant)) + continue; + + group->name = pin->pin.name; + group->pin = pin->pin.number; + + /* And now we count the actual number of pins / groups */ + pctl->ngroups++; + } + + /* + * We suppose that we won't have any more functions than pins, + * we'll reallocate that later anyway + */ + pctl->functions = kcalloc(pctl->ngroups, + sizeof(*pctl->functions), + GFP_KERNEL); + if (!pctl->functions) + return -ENOMEM; + + /* Count functions and their associated groups */ + for (i = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + struct sunxi_desc_function *func; + + if (pin->variant && !(pctl->variant & pin->variant)) + continue; + + for (func = pin->functions; func->name; func++) { + if (func->variant && !(pctl->variant & func->variant)) + continue; + + /* Create interrupt mapping while we're at it */ + if (!strcmp(func->name, "irq")) { + int irqnum = func->irqnum + func->irqbank * IRQ_PER_BANK; + pctl->irq_array[irqnum] = pin->pin.number; + } + + sunxi_pinctrl_add_function(pctl, func->name); + } + } + + /* And now allocated and fill the array for real */ + ptr = krealloc(pctl->functions, + pctl->nfunctions * sizeof(*pctl->functions), + GFP_KERNEL); + if (!ptr) { + kfree(pctl->functions); + pctl->functions = NULL; + return -ENOMEM; + } + pctl->functions = ptr; + + for (i = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + struct sunxi_desc_function *func; + + if (pin->variant && !(pctl->variant & pin->variant)) + continue; + + for (func = pin->functions; func->name; func++) { + struct sunxi_pinctrl_function *func_item; + const char **func_grp; + + if (func->variant && !(pctl->variant & func->variant)) + continue; + + func_item = sunxi_pinctrl_find_function_by_name(pctl, + func->name); + if (!func_item) { + kfree(pctl->functions); + return -EINVAL; + } + + if (!func_item->groups) { + func_item->groups = + devm_kcalloc(&pdev->dev, + func_item->ngroups, + sizeof(*func_item->groups), + GFP_KERNEL); + if (!func_item->groups) { + kfree(pctl->functions); + return -ENOMEM; + } + } + + func_grp = func_item->groups; + while (*func_grp) + func_grp++; + + *func_grp = pin->pin.name; + } + } + + return 0; +} + +static int sunxi_pinctrl_get_debounce_div(struct clk *clk, int freq, int *diff) +{ + unsigned long clock = clk_get_rate(clk); + unsigned int best_diff, best_div; + int i; + + best_diff = abs(freq - clock); + best_div = 0; + + for (i = 1; i < 8; i++) { + int cur_diff = abs(freq - (clock >> i)); + + if (cur_diff < best_diff) { + best_diff = cur_diff; + best_div = i; + } + } + + *diff = best_diff; + return best_div; +} + +static int sunxi_pinctrl_setup_debounce(struct sunxi_pinctrl *pctl, + struct device_node *node) +{ + unsigned int hosc_diff, losc_diff; + unsigned int hosc_div, losc_div; + struct clk *hosc, *losc; + u8 div, src; + int i, ret; + + /* Deal with old DTs that didn't have the oscillators */ + if (of_clk_get_parent_count(node) != 3) + return 0; + + /* If we don't have any setup, bail out */ + if (!of_find_property(node, "input-debounce", NULL)) + return 0; + + losc = devm_clk_get(pctl->dev, "losc"); + if (IS_ERR(losc)) + return PTR_ERR(losc); + + hosc = devm_clk_get(pctl->dev, "hosc"); + if (IS_ERR(hosc)) + return PTR_ERR(hosc); + + for (i = 0; i < pctl->desc->irq_banks; i++) { + unsigned long debounce_freq; + u32 debounce; + + ret = of_property_read_u32_index(node, "input-debounce", + i, &debounce); + if (ret) + return ret; + + if (!debounce) + continue; + + debounce_freq = DIV_ROUND_CLOSEST(USEC_PER_SEC, debounce); + losc_div = sunxi_pinctrl_get_debounce_div(losc, + debounce_freq, + &losc_diff); + + hosc_div = sunxi_pinctrl_get_debounce_div(hosc, + debounce_freq, + &hosc_diff); + + if (hosc_diff < losc_diff) { + div = hosc_div; + src = 1; + } else { + div = losc_div; + src = 0; + } + + writel(src | div << 4, + pctl->membase + + sunxi_irq_debounce_reg_from_bank(pctl->desc, i)); + } + + return 0; +} + +int sunxi_pinctrl_init_with_variant(struct platform_device *pdev, + const struct sunxi_pinctrl_desc *desc, + unsigned long variant) +{ + struct device_node *node = pdev->dev.of_node; + struct pinctrl_desc *pctrl_desc; + struct pinctrl_pin_desc *pins; + struct sunxi_pinctrl *pctl; + struct pinmux_ops *pmxops; + struct resource *res; + int i, ret, last_pin, pin_idx; + struct clk *clk; + + pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL); + if (!pctl) + return -ENOMEM; + platform_set_drvdata(pdev, pctl); + + raw_spin_lock_init(&pctl->lock); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pctl->membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pctl->membase)) + return PTR_ERR(pctl->membase); + + pctl->dev = &pdev->dev; + pctl->desc = desc; + pctl->variant = variant; + + pctl->irq_array = devm_kcalloc(&pdev->dev, + IRQ_PER_BANK * pctl->desc->irq_banks, + sizeof(*pctl->irq_array), + GFP_KERNEL); + if (!pctl->irq_array) + return -ENOMEM; + + ret = sunxi_pinctrl_build_state(pdev); + if (ret) { + dev_err(&pdev->dev, "dt probe failed: %d\n", ret); + return ret; + } + + pins = devm_kcalloc(&pdev->dev, + pctl->desc->npins, sizeof(*pins), + GFP_KERNEL); + if (!pins) + return -ENOMEM; + + for (i = 0, pin_idx = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + + if (pin->variant && !(pctl->variant & pin->variant)) + continue; + + pins[pin_idx++] = pin->pin; + } + + pctrl_desc = devm_kzalloc(&pdev->dev, + sizeof(*pctrl_desc), + GFP_KERNEL); + if (!pctrl_desc) + return -ENOMEM; + + pctrl_desc->name = dev_name(&pdev->dev); + pctrl_desc->owner = THIS_MODULE; + pctrl_desc->pins = pins; + pctrl_desc->npins = pctl->ngroups; + pctrl_desc->confops = &sunxi_pconf_ops; + pctrl_desc->pctlops = &sunxi_pctrl_ops; + + pmxops = devm_kmemdup(&pdev->dev, &sunxi_pmx_ops, sizeof(sunxi_pmx_ops), + GFP_KERNEL); + if (!pmxops) + return -ENOMEM; + + if (desc->disable_strict_mode) + pmxops->strict = false; + + pctrl_desc->pmxops = pmxops; + + pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, pctl); + if (IS_ERR(pctl->pctl_dev)) { + dev_err(&pdev->dev, "couldn't register pinctrl driver\n"); + return PTR_ERR(pctl->pctl_dev); + } + + pctl->chip = devm_kzalloc(&pdev->dev, sizeof(*pctl->chip), GFP_KERNEL); + if (!pctl->chip) + return -ENOMEM; + + last_pin = pctl->desc->pins[pctl->desc->npins - 1].pin.number; + pctl->chip->owner = THIS_MODULE; + pctl->chip->request = gpiochip_generic_request, + pctl->chip->free = gpiochip_generic_free, + pctl->chip->direction_input = sunxi_pinctrl_gpio_direction_input, + pctl->chip->direction_output = sunxi_pinctrl_gpio_direction_output, + pctl->chip->get = sunxi_pinctrl_gpio_get, + pctl->chip->set = sunxi_pinctrl_gpio_set, + pctl->chip->of_xlate = sunxi_pinctrl_gpio_of_xlate, + pctl->chip->to_irq = sunxi_pinctrl_gpio_to_irq, + pctl->chip->of_gpio_n_cells = 3, + pctl->chip->can_sleep = false, + pctl->chip->ngpio = round_up(last_pin, PINS_PER_BANK) - + pctl->desc->pin_base; + pctl->chip->label = dev_name(&pdev->dev); + pctl->chip->parent = &pdev->dev; + pctl->chip->base = pctl->desc->pin_base; + + ret = gpiochip_add_data(pctl->chip, pctl); + if (ret) + return ret; + + for (i = 0; i < pctl->desc->npins; i++) { + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; + + ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev), + pin->pin.number - pctl->desc->pin_base, + pin->pin.number, 1); + if (ret) + goto gpiochip_error; + } + + ret = of_clk_get_parent_count(node); + clk = devm_clk_get(&pdev->dev, ret == 1 ? NULL : "apb"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + goto gpiochip_error; + } + + ret = clk_prepare_enable(clk); + if (ret) + goto gpiochip_error; + + pctl->irq = devm_kcalloc(&pdev->dev, + pctl->desc->irq_banks, + sizeof(*pctl->irq), + GFP_KERNEL); + if (!pctl->irq) { + ret = -ENOMEM; + goto clk_error; + } + + for (i = 0; i < pctl->desc->irq_banks; i++) { + pctl->irq[i] = platform_get_irq(pdev, i); + if (pctl->irq[i] < 0) { + ret = pctl->irq[i]; + goto clk_error; + } + } + + pctl->domain = irq_domain_add_linear(node, + pctl->desc->irq_banks * IRQ_PER_BANK, + &sunxi_pinctrl_irq_domain_ops, + pctl); + if (!pctl->domain) { + dev_err(&pdev->dev, "Couldn't register IRQ domain\n"); + ret = -ENOMEM; + goto clk_error; + } + + for (i = 0; i < (pctl->desc->irq_banks * IRQ_PER_BANK); i++) { + int irqno = irq_create_mapping(pctl->domain, i); + + irq_set_chip_and_handler(irqno, &sunxi_pinctrl_edge_irq_chip, + handle_edge_irq); + irq_set_chip_data(irqno, pctl); + } + + for (i = 0; i < pctl->desc->irq_banks; i++) { + /* Mask and clear all IRQs before registering a handler */ + writel(0, pctl->membase + + sunxi_irq_ctrl_reg_from_bank(pctl->desc, i)); + writel(0xffffffff, + pctl->membase + + sunxi_irq_status_reg_from_bank(pctl->desc, i)); + + irq_set_chained_handler_and_data(pctl->irq[i], + sunxi_pinctrl_irq_handler, + pctl); + } + + sunxi_pinctrl_setup_debounce(pctl, node); + + dev_info(&pdev->dev, "initialized sunXi PIO driver\n"); + + return 0; + +clk_error: + clk_disable_unprepare(clk); +gpiochip_error: + gpiochip_remove(pctl->chip); + return ret; +} |