diff options
Diffstat (limited to 'drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c')
| -rw-r--r-- | drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c | 1019 |
1 files changed, 1019 insertions, 0 deletions
diff --git a/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c b/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c new file mode 100644 index 000000000..b4f799572 --- /dev/null +++ b/drivers/pinctrl/starfive/pinctrl-starfive-jh7110.c @@ -0,0 +1,1019 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Pinctrl / GPIO driver for StarFive JH7110 SoC + * + * Copyright (C) 2022 Emil Renner Berthing <kernel@esmil.dk> + * Copyright (C) 2022 StarFive Technology Co., Ltd. + */ + +#include <linux/bits.h> +#include <linux/clk.h> +#include <linux/gpio/driver.h> +#include <linux/io.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include <linux/seq_file.h> +#include <linux/spinlock.h> + +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> + +#include <dt-bindings/pinctrl/starfive,jh7110-pinctrl.h> + +#include "../core.h" +#include "../pinctrl-utils.h" +#include "../pinmux.h" +#include "../pinconf.h" +#include "pinctrl-starfive-jh7110.h" + +/* pad control bits */ +#define JH7110_PADCFG_POS BIT(7) +#define JH7110_PADCFG_SMT BIT(6) +#define JH7110_PADCFG_SLEW BIT(5) +#define JH7110_PADCFG_PD BIT(4) +#define JH7110_PADCFG_PU BIT(3) +#define JH7110_PADCFG_BIAS (JH7110_PADCFG_PD | JH7110_PADCFG_PU) +#define JH7110_PADCFG_DS_MASK GENMASK(2, 1) +#define JH7110_PADCFG_DS_2MA (0U << 1) +#define JH7110_PADCFG_DS_4MA BIT(1) +#define JH7110_PADCFG_DS_8MA (2U << 1) +#define JH7110_PADCFG_DS_12MA (3U << 1) +#define JH7110_PADCFG_IE BIT(0) + +/* + * The packed pinmux values from the device tree look like this: + * + * | 31 - 24 | 23 - 16 | 15 - 10 | 9 - 8 | 7 - 0 | + * | din | dout | doen | function | pin | + */ +static unsigned int jh7110_pinmux_din(u32 v) +{ + return (v & GENMASK(31, 24)) >> 24; +} + +static u32 jh7110_pinmux_dout(u32 v) +{ + return (v & GENMASK(23, 16)) >> 16; +} + +static u32 jh7110_pinmux_doen(u32 v) +{ + return (v & GENMASK(15, 10)) >> 10; +} + +static u32 jh7110_pinmux_function(u32 v) +{ + return (v & GENMASK(9, 8)) >> 8; +} + +static unsigned int jh7110_pinmux_pin(u32 v) +{ + return v & GENMASK(7, 0); +} + +static struct jh7110_pinctrl *jh7110_from_irq_data(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + + return container_of(gc, struct jh7110_pinctrl, gc); +} + +struct jh7110_pinctrl *jh7110_from_irq_desc(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + + return container_of(gc, struct jh7110_pinctrl, gc); +} +EXPORT_SYMBOL_GPL(jh7110_from_irq_desc); + +#ifdef CONFIG_DEBUG_FS +static void jh7110_pin_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned int pin) +{ + struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + + seq_printf(s, "%s", dev_name(pctldev->dev)); + + if (pin < sfp->gc.ngpio) { + unsigned int offset = 4 * (pin / 4); + unsigned int shift = 8 * (pin % 4); + u32 dout = readl_relaxed(sfp->base + info->dout_reg_base + offset); + u32 doen = readl_relaxed(sfp->base + info->doen_reg_base + offset); + u32 gpi = readl_relaxed(sfp->base + info->gpi_reg_base + offset); + + dout = (dout >> shift) & info->dout_mask; + doen = (doen >> shift) & info->doen_mask; + gpi = ((gpi >> shift) - 2) & info->gpi_mask; + + seq_printf(s, " dout=%u doen=%u din=%u", dout, doen, gpi); + } +} +#else +#define jh7110_pin_dbg_show NULL +#endif + +static int jh7110_dt_node_to_map(struct pinctrl_dev *pctldev, + struct device_node *np, + struct pinctrl_map **maps, + unsigned int *num_maps) +{ + struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); + struct device *dev = sfp->gc.parent; + struct device_node *child; + struct pinctrl_map *map; + const char **pgnames; + const char *grpname; + int ngroups; + int nmaps; + int ret; + + ngroups = 0; + for_each_available_child_of_node(np, child) + ngroups += 1; + nmaps = 2 * ngroups; + + pgnames = devm_kcalloc(dev, ngroups, sizeof(*pgnames), GFP_KERNEL); + if (!pgnames) + return -ENOMEM; + + map = kcalloc(nmaps, sizeof(*map), GFP_KERNEL); + if (!map) + return -ENOMEM; + + nmaps = 0; + ngroups = 0; + mutex_lock(&sfp->mutex); + for_each_available_child_of_node(np, child) { + int npins = of_property_count_u32_elems(child, "pinmux"); + int *pins; + u32 *pinmux; + int i; + + if (npins < 1) { + dev_err(dev, + "invalid pinctrl group %pOFn.%pOFn: pinmux not set\n", + np, child); + ret = -EINVAL; + goto put_child; + } + + grpname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", np, child); + if (!grpname) { + ret = -ENOMEM; + goto put_child; + } + + pgnames[ngroups++] = grpname; + + pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL); + if (!pins) { + ret = -ENOMEM; + goto put_child; + } + + pinmux = devm_kcalloc(dev, npins, sizeof(*pinmux), GFP_KERNEL); + if (!pinmux) { + ret = -ENOMEM; + goto put_child; + } + + ret = of_property_read_u32_array(child, "pinmux", pinmux, npins); + if (ret) + goto put_child; + + for (i = 0; i < npins; i++) + pins[i] = jh7110_pinmux_pin(pinmux[i]); + + map[nmaps].type = PIN_MAP_TYPE_MUX_GROUP; + map[nmaps].data.mux.function = np->name; + map[nmaps].data.mux.group = grpname; + nmaps += 1; + + ret = pinctrl_generic_add_group(pctldev, grpname, + pins, npins, pinmux); + if (ret < 0) { + dev_err(dev, "error adding group %s: %d\n", grpname, ret); + goto put_child; + } + + ret = pinconf_generic_parse_dt_config(child, pctldev, + &map[nmaps].data.configs.configs, + &map[nmaps].data.configs.num_configs); + if (ret) { + dev_err(dev, "error parsing pin config of group %s: %d\n", + grpname, ret); + goto put_child; + } + + /* don't create a map if there are no pinconf settings */ + if (map[nmaps].data.configs.num_configs == 0) + continue; + + map[nmaps].type = PIN_MAP_TYPE_CONFIGS_GROUP; + map[nmaps].data.configs.group_or_pin = grpname; + nmaps += 1; + } + + ret = pinmux_generic_add_function(pctldev, np->name, + pgnames, ngroups, NULL); + if (ret < 0) { + dev_err(dev, "error adding function %s: %d\n", np->name, ret); + goto free_map; + } + mutex_unlock(&sfp->mutex); + + *maps = map; + *num_maps = nmaps; + return 0; + +put_child: + of_node_put(child); +free_map: + pinctrl_utils_free_map(pctldev, map, nmaps); + mutex_unlock(&sfp->mutex); + return ret; +} + +static const struct pinctrl_ops jh7110_pinctrl_ops = { + .get_groups_count = pinctrl_generic_get_group_count, + .get_group_name = pinctrl_generic_get_group_name, + .get_group_pins = pinctrl_generic_get_group_pins, + .pin_dbg_show = jh7110_pin_dbg_show, + .dt_node_to_map = jh7110_dt_node_to_map, + .dt_free_map = pinctrl_utils_free_map, +}; + +void jh7110_set_gpiomux(struct jh7110_pinctrl *sfp, unsigned int pin, + unsigned int din, u32 dout, u32 doen) +{ + const struct jh7110_pinctrl_soc_info *info = sfp->info; + + unsigned int offset = 4 * (pin / 4); + unsigned int shift = 8 * (pin % 4); + u32 dout_mask = info->dout_mask << shift; + u32 done_mask = info->doen_mask << shift; + u32 ival, imask; + void __iomem *reg_dout; + void __iomem *reg_doen; + void __iomem *reg_din; + unsigned long flags; + + reg_dout = sfp->base + info->dout_reg_base + offset; + reg_doen = sfp->base + info->doen_reg_base + offset; + dout <<= shift; + doen <<= shift; + if (din != GPI_NONE) { + unsigned int ioffset = 4 * (din / 4); + unsigned int ishift = 8 * (din % 4); + + reg_din = sfp->base + info->gpi_reg_base + ioffset; + ival = (pin + 2) << ishift; + imask = info->gpi_mask << ishift; + } else { + reg_din = NULL; + } + + raw_spin_lock_irqsave(&sfp->lock, flags); + dout |= readl_relaxed(reg_dout) & ~dout_mask; + writel_relaxed(dout, reg_dout); + doen |= readl_relaxed(reg_doen) & ~done_mask; + writel_relaxed(doen, reg_doen); + if (reg_din) { + ival |= readl_relaxed(reg_din) & ~imask; + writel_relaxed(ival, reg_din); + } + raw_spin_unlock_irqrestore(&sfp->lock, flags); +} +EXPORT_SYMBOL_GPL(jh7110_set_gpiomux); + +static int jh7110_set_mux(struct pinctrl_dev *pctldev, + unsigned int fsel, unsigned int gsel) +{ + struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + const struct group_desc *group; + const u32 *pinmux; + unsigned int i; + + group = pinctrl_generic_get_group(pctldev, gsel); + if (!group) + return -EINVAL; + + pinmux = group->data; + for (i = 0; i < group->num_pins; i++) { + u32 v = pinmux[i]; + + if (info->jh7110_set_one_pin_mux) + info->jh7110_set_one_pin_mux(sfp, + jh7110_pinmux_pin(v), + jh7110_pinmux_din(v), + jh7110_pinmux_dout(v), + jh7110_pinmux_doen(v), + jh7110_pinmux_function(v)); + } + + return 0; +} + +static const struct pinmux_ops jh7110_pinmux_ops = { + .get_functions_count = pinmux_generic_get_function_count, + .get_function_name = pinmux_generic_get_function_name, + .get_function_groups = pinmux_generic_get_function_groups, + .set_mux = jh7110_set_mux, + .strict = true, +}; + +static const u8 jh7110_drive_strength_mA[4] = { 2, 4, 8, 12 }; + +static u32 jh7110_padcfg_ds_to_mA(u32 padcfg) +{ + return jh7110_drive_strength_mA[(padcfg >> 1) & 3U]; +} + +static u32 jh7110_padcfg_ds_from_mA(u32 v) +{ + int i; + + for (i = 0; i < 3; i++) { + if (v <= jh7110_drive_strength_mA[i]) + break; + } + return i << 1; +} + +static void jh7110_padcfg_rmw(struct jh7110_pinctrl *sfp, + unsigned int pin, u32 mask, u32 value) +{ + const struct jh7110_pinctrl_soc_info *info = sfp->info; + void __iomem *reg; + unsigned long flags; + int padcfg_base; + + if (!info->jh7110_get_padcfg_base) + return; + + padcfg_base = info->jh7110_get_padcfg_base(sfp, pin); + if (padcfg_base < 0) + return; + + reg = sfp->base + padcfg_base + 4 * pin; + value &= mask; + + raw_spin_lock_irqsave(&sfp->lock, flags); + value |= readl_relaxed(reg) & ~mask; + writel_relaxed(value, reg); + raw_spin_unlock_irqrestore(&sfp->lock, flags); +} + +static int jh7110_pinconf_get(struct pinctrl_dev *pctldev, + unsigned int pin, unsigned long *config) +{ + struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + int param = pinconf_to_config_param(*config); + u32 padcfg, arg; + bool enabled; + int padcfg_base; + + if (!info->jh7110_get_padcfg_base) + return 0; + + padcfg_base = info->jh7110_get_padcfg_base(sfp, pin); + if (padcfg_base < 0) + return 0; + + padcfg = readl_relaxed(sfp->base + padcfg_base + 4 * pin); + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + enabled = !(padcfg & JH7110_PADCFG_BIAS); + arg = 0; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + enabled = padcfg & JH7110_PADCFG_PD; + arg = 1; + break; + case PIN_CONFIG_BIAS_PULL_UP: + enabled = padcfg & JH7110_PADCFG_PU; + arg = 1; + break; + case PIN_CONFIG_DRIVE_STRENGTH: + enabled = true; + arg = jh7110_padcfg_ds_to_mA(padcfg); + break; + case PIN_CONFIG_INPUT_ENABLE: + enabled = padcfg & JH7110_PADCFG_IE; + arg = enabled; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + enabled = padcfg & JH7110_PADCFG_SMT; + arg = enabled; + break; + case PIN_CONFIG_SLEW_RATE: + enabled = true; + arg = !!(padcfg & JH7110_PADCFG_SLEW); + break; + default: + return -ENOTSUPP; + } + + *config = pinconf_to_config_packed(param, arg); + return enabled ? 0 : -EINVAL; +} + +static int jh7110_pinconf_group_get(struct pinctrl_dev *pctldev, + unsigned int gsel, + unsigned long *config) +{ + const struct group_desc *group; + + group = pinctrl_generic_get_group(pctldev, gsel); + if (!group) + return -EINVAL; + + return jh7110_pinconf_get(pctldev, group->pins[0], config); +} + +static int jh7110_pinconf_group_set(struct pinctrl_dev *pctldev, + unsigned int gsel, + unsigned long *configs, + unsigned int num_configs) +{ + struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); + const struct group_desc *group; + u16 mask, value; + int i; + + group = pinctrl_generic_get_group(pctldev, gsel); + if (!group) + return -EINVAL; + + mask = 0; + value = 0; + for (i = 0; i < num_configs; i++) { + int param = pinconf_to_config_param(configs[i]); + u32 arg = pinconf_to_config_argument(configs[i]); + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + mask |= JH7110_PADCFG_BIAS; + value &= ~JH7110_PADCFG_BIAS; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + if (arg == 0) + return -ENOTSUPP; + mask |= JH7110_PADCFG_BIAS; + value = (value & ~JH7110_PADCFG_BIAS) | JH7110_PADCFG_PD; + break; + case PIN_CONFIG_BIAS_PULL_UP: + if (arg == 0) + return -ENOTSUPP; + mask |= JH7110_PADCFG_BIAS; + value = (value & ~JH7110_PADCFG_BIAS) | JH7110_PADCFG_PU; + break; + case PIN_CONFIG_DRIVE_STRENGTH: + mask |= JH7110_PADCFG_DS_MASK; + value = (value & ~JH7110_PADCFG_DS_MASK) | + jh7110_padcfg_ds_from_mA(arg); + break; + case PIN_CONFIG_INPUT_ENABLE: + mask |= JH7110_PADCFG_IE; + if (arg) + value |= JH7110_PADCFG_IE; + else + value &= ~JH7110_PADCFG_IE; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + mask |= JH7110_PADCFG_SMT; + if (arg) + value |= JH7110_PADCFG_SMT; + else + value &= ~JH7110_PADCFG_SMT; + break; + case PIN_CONFIG_SLEW_RATE: + mask |= JH7110_PADCFG_SLEW; + if (arg) + value |= JH7110_PADCFG_SLEW; + else + value &= ~JH7110_PADCFG_SLEW; + break; + default: + return -ENOTSUPP; + } + } + + for (i = 0; i < group->num_pins; i++) + jh7110_padcfg_rmw(sfp, group->pins[i], mask, value); + + return 0; +} + +#ifdef CONFIG_DEBUG_FS +static void jh7110_pinconf_dbg_show(struct pinctrl_dev *pctldev, + struct seq_file *s, unsigned int pin) +{ + struct jh7110_pinctrl *sfp = pinctrl_dev_get_drvdata(pctldev); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + u32 value; + int padcfg_base; + + if (!info->jh7110_get_padcfg_base) + return; + + padcfg_base = info->jh7110_get_padcfg_base(sfp, pin); + if (padcfg_base < 0) + return; + + value = readl_relaxed(sfp->base + padcfg_base + 4 * pin); + seq_printf(s, " (0x%02x)", value); +} +#else +#define jh7110_pinconf_dbg_show NULL +#endif + +static const struct pinconf_ops jh7110_pinconf_ops = { + .pin_config_get = jh7110_pinconf_get, + .pin_config_group_get = jh7110_pinconf_group_get, + .pin_config_group_set = jh7110_pinconf_group_set, + .pin_config_dbg_show = jh7110_pinconf_dbg_show, + .is_generic = true, +}; + +static int jh7110_gpio_request(struct gpio_chip *gc, unsigned int gpio) +{ + return pinctrl_gpio_request(gc->base + gpio); +} + +static void jh7110_gpio_free(struct gpio_chip *gc, unsigned int gpio) +{ + pinctrl_gpio_free(gc->base + gpio); +} + +static int jh7110_gpio_get_direction(struct gpio_chip *gc, + unsigned int gpio) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + unsigned int offset = 4 * (gpio / 4); + unsigned int shift = 8 * (gpio % 4); + u32 doen = readl_relaxed(sfp->base + info->doen_reg_base + offset); + + doen = (doen >> shift) & info->doen_mask; + + return doen == GPOEN_ENABLE ? + GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; +} + +static int jh7110_gpio_direction_input(struct gpio_chip *gc, + unsigned int gpio) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + + /* enable input and schmitt trigger */ + jh7110_padcfg_rmw(sfp, gpio, + JH7110_PADCFG_IE | JH7110_PADCFG_SMT, + JH7110_PADCFG_IE | JH7110_PADCFG_SMT); + + if (info->jh7110_set_one_pin_mux) + info->jh7110_set_one_pin_mux(sfp, gpio, + GPI_NONE, GPOUT_LOW, GPOEN_DISABLE, 0); + + return 0; +} + +static int jh7110_gpio_direction_output(struct gpio_chip *gc, + unsigned int gpio, int value) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + + if (info->jh7110_set_one_pin_mux) + info->jh7110_set_one_pin_mux(sfp, gpio, + GPI_NONE, value ? GPOUT_HIGH : GPOUT_LOW, + GPOEN_ENABLE, 0); + + /* disable input, schmitt trigger and bias */ + jh7110_padcfg_rmw(sfp, gpio, + JH7110_PADCFG_IE | JH7110_PADCFG_SMT | + JH7110_PADCFG_BIAS, 0); + return 0; +} + +static int jh7110_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + void __iomem *reg = sfp->base + info->gpioin_reg_base + + 4 * (gpio / 32); + + return !!(readl_relaxed(reg) & BIT(gpio % 32)); +} + +static void jh7110_gpio_set(struct gpio_chip *gc, + unsigned int gpio, int value) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + const struct jh7110_pinctrl_soc_info *info = sfp->info; + unsigned int offset = 4 * (gpio / 4); + unsigned int shift = 8 * (gpio % 4); + void __iomem *reg_dout = sfp->base + info->dout_reg_base + offset; + u32 dout = (value ? GPOUT_HIGH : GPOUT_LOW) << shift; + u32 mask = info->dout_mask << shift; + unsigned long flags; + + raw_spin_lock_irqsave(&sfp->lock, flags); + dout |= readl_relaxed(reg_dout) & ~mask; + writel_relaxed(dout, reg_dout); + raw_spin_unlock_irqrestore(&sfp->lock, flags); +} + +static int jh7110_gpio_set_config(struct gpio_chip *gc, + unsigned int gpio, unsigned long config) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + u32 arg = pinconf_to_config_argument(config); + u32 value; + u32 mask; + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_DISABLE: + mask = JH7110_PADCFG_BIAS; + value = 0; + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + if (arg == 0) + return -ENOTSUPP; + mask = JH7110_PADCFG_BIAS; + value = JH7110_PADCFG_PD; + break; + case PIN_CONFIG_BIAS_PULL_UP: + if (arg == 0) + return -ENOTSUPP; + mask = JH7110_PADCFG_BIAS; + value = JH7110_PADCFG_PU; + break; + case PIN_CONFIG_DRIVE_PUSH_PULL: + return 0; + case PIN_CONFIG_INPUT_ENABLE: + mask = JH7110_PADCFG_IE; + value = arg ? JH7110_PADCFG_IE : 0; + break; + case PIN_CONFIG_INPUT_SCHMITT_ENABLE: + mask = JH7110_PADCFG_SMT; + value = arg ? JH7110_PADCFG_SMT : 0; + break; + default: + return -ENOTSUPP; + } + + jh7110_padcfg_rmw(sfp, gpio, mask, value); + return 0; +} + +static int jh7110_gpio_add_pin_ranges(struct gpio_chip *gc) +{ + struct jh7110_pinctrl *sfp = container_of(gc, + struct jh7110_pinctrl, gc); + + sfp->gpios.name = sfp->gc.label; + sfp->gpios.base = sfp->gc.base; + sfp->gpios.pin_base = 0; + sfp->gpios.npins = sfp->gc.ngpio; + sfp->gpios.gc = &sfp->gc; + pinctrl_add_gpio_range(sfp->pctl, &sfp->gpios); + return 0; +} + +static void jh7110_irq_ack(struct irq_data *d) +{ + struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d); + const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg; + irq_hw_number_t gpio = irqd_to_hwirq(d); + void __iomem *ic = sfp->base + irq_reg->ic_reg_base + + 4 * (gpio / 32); + u32 mask = BIT(gpio % 32); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&sfp->lock, flags); + value = readl_relaxed(ic) & ~mask; + writel_relaxed(value, ic); + writel_relaxed(value | mask, ic); + raw_spin_unlock_irqrestore(&sfp->lock, flags); +} + +static void jh7110_irq_mask(struct irq_data *d) +{ + struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d); + const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg; + irq_hw_number_t gpio = irqd_to_hwirq(d); + void __iomem *ie = sfp->base + irq_reg->ie_reg_base + + 4 * (gpio / 32); + u32 mask = BIT(gpio % 32); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&sfp->lock, flags); + value = readl_relaxed(ie) & ~mask; + writel_relaxed(value, ie); + raw_spin_unlock_irqrestore(&sfp->lock, flags); + + gpiochip_disable_irq(&sfp->gc, d->hwirq); +} + +static void jh7110_irq_mask_ack(struct irq_data *d) +{ + struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d); + const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg; + irq_hw_number_t gpio = irqd_to_hwirq(d); + void __iomem *ie = sfp->base + irq_reg->ie_reg_base + + 4 * (gpio / 32); + void __iomem *ic = sfp->base + irq_reg->ic_reg_base + + 4 * (gpio / 32); + u32 mask = BIT(gpio % 32); + unsigned long flags; + u32 value; + + raw_spin_lock_irqsave(&sfp->lock, flags); + value = readl_relaxed(ie) & ~mask; + writel_relaxed(value, ie); + + value = readl_relaxed(ic) & ~mask; + writel_relaxed(value, ic); + writel_relaxed(value | mask, ic); + raw_spin_unlock_irqrestore(&sfp->lock, flags); +} + +static void jh7110_irq_unmask(struct irq_data *d) +{ + struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d); + const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg; + irq_hw_number_t gpio = irqd_to_hwirq(d); + void __iomem *ie = sfp->base + irq_reg->ie_reg_base + + 4 * (gpio / 32); + u32 mask = BIT(gpio % 32); + unsigned long flags; + u32 value; + + gpiochip_enable_irq(&sfp->gc, d->hwirq); + + raw_spin_lock_irqsave(&sfp->lock, flags); + value = readl_relaxed(ie) | mask; + writel_relaxed(value, ie); + raw_spin_unlock_irqrestore(&sfp->lock, flags); +} + +static int jh7110_irq_set_type(struct irq_data *d, unsigned int trigger) +{ + struct jh7110_pinctrl *sfp = jh7110_from_irq_data(d); + const struct jh7110_gpio_irq_reg *irq_reg = sfp->info->irq_reg; + irq_hw_number_t gpio = irqd_to_hwirq(d); + void __iomem *base = sfp->base + 4 * (gpio / 32); + u32 mask = BIT(gpio % 32); + u32 irq_type, edge_both, polarity; + unsigned long flags; + + switch (trigger) { + case IRQ_TYPE_EDGE_RISING: + irq_type = mask; /* 1: edge triggered */ + edge_both = 0; /* 0: single edge */ + polarity = mask; /* 1: rising edge */ + break; + case IRQ_TYPE_EDGE_FALLING: + irq_type = mask; /* 1: edge triggered */ + edge_both = 0; /* 0: single edge */ + polarity = 0; /* 0: falling edge */ + break; + case IRQ_TYPE_EDGE_BOTH: + irq_type = mask; /* 1: edge triggered */ + edge_both = mask; /* 1: both edges */ + polarity = 0; /* 0: ignored */ + break; + case IRQ_TYPE_LEVEL_HIGH: + irq_type = 0; /* 0: level triggered */ + edge_both = 0; /* 0: ignored */ + polarity = mask; /* 1: high level */ + break; + case IRQ_TYPE_LEVEL_LOW: + irq_type = 0; /* 0: level triggered */ + edge_both = 0; /* 0: ignored */ + polarity = 0; /* 0: low level */ + break; + default: + return -EINVAL; + } + + if (trigger & IRQ_TYPE_EDGE_BOTH) + irq_set_handler_locked(d, handle_edge_irq); + else + irq_set_handler_locked(d, handle_level_irq); + + raw_spin_lock_irqsave(&sfp->lock, flags); + irq_type |= readl_relaxed(base + irq_reg->is_reg_base) & ~mask; + writel_relaxed(irq_type, base + irq_reg->is_reg_base); + + edge_both |= readl_relaxed(base + irq_reg->ibe_reg_base) & ~mask; + writel_relaxed(edge_both, base + irq_reg->ibe_reg_base); + + polarity |= readl_relaxed(base + irq_reg->iev_reg_base) & ~mask; + writel_relaxed(polarity, base + irq_reg->iev_reg_base); + raw_spin_unlock_irqrestore(&sfp->lock, flags); + return 0; +} + +static struct irq_chip jh7110_irq_chip = { + .irq_ack = jh7110_irq_ack, + .irq_mask = jh7110_irq_mask, + .irq_mask_ack = jh7110_irq_mask_ack, + .irq_unmask = jh7110_irq_unmask, + .irq_set_type = jh7110_irq_set_type, + .flags = IRQCHIP_IMMUTABLE | IRQCHIP_SET_TYPE_MASKED, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static void jh7110_disable_clock(void *data) +{ + clk_disable_unprepare(data); +} + +int jh7110_pinctrl_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct jh7110_pinctrl_soc_info *info; + struct jh7110_pinctrl *sfp; + struct pinctrl_desc *jh7110_pinctrl_desc; + struct reset_control *rst; + struct clk *clk; + int ret; + + info = of_device_get_match_data(&pdev->dev); + if (!info) + return -ENODEV; + + if (!info->pins || !info->npins) { + dev_err(dev, "wrong pinctrl info\n"); + return -EINVAL; + } + + sfp = devm_kzalloc(dev, sizeof(*sfp), GFP_KERNEL); + if (!sfp) + return -ENOMEM; + +#if IS_ENABLED(CONFIG_PM_SLEEP) + sfp->saved_regs = devm_kcalloc(dev, info->nsaved_regs, + sizeof(*sfp->saved_regs), GFP_KERNEL); + if (!sfp->saved_regs) + return -ENOMEM; +#endif + + sfp->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sfp->base)) + return PTR_ERR(sfp->base); + + clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), "could not get clock\n"); + + rst = devm_reset_control_get_exclusive(dev, NULL); + if (IS_ERR(rst)) + return dev_err_probe(dev, PTR_ERR(rst), "could not get reset\n"); + + /* + * we don't want to assert reset and risk undoing pin muxing for the + * early boot serial console, but let's make sure the reset line is + * deasserted in case someone runs a really minimal bootloader. + */ + ret = reset_control_deassert(rst); + if (ret) + return dev_err_probe(dev, ret, "could not deassert reset\n"); + + if (clk) { + ret = clk_prepare_enable(clk); + if (ret) + return dev_err_probe(dev, ret, "could not enable clock\n"); + + ret = devm_add_action_or_reset(dev, jh7110_disable_clock, clk); + if (ret) + return ret; + } + + jh7110_pinctrl_desc = devm_kzalloc(&pdev->dev, + sizeof(*jh7110_pinctrl_desc), + GFP_KERNEL); + if (!jh7110_pinctrl_desc) + return -ENOMEM; + + jh7110_pinctrl_desc->name = dev_name(dev); + jh7110_pinctrl_desc->pins = info->pins; + jh7110_pinctrl_desc->npins = info->npins; + jh7110_pinctrl_desc->pctlops = &jh7110_pinctrl_ops; + jh7110_pinctrl_desc->pmxops = &jh7110_pinmux_ops; + jh7110_pinctrl_desc->confops = &jh7110_pinconf_ops; + jh7110_pinctrl_desc->owner = THIS_MODULE; + + sfp->info = info; + sfp->dev = dev; + platform_set_drvdata(pdev, sfp); + sfp->gc.parent = dev; + raw_spin_lock_init(&sfp->lock); + mutex_init(&sfp->mutex); + + ret = devm_pinctrl_register_and_init(dev, + jh7110_pinctrl_desc, + sfp, &sfp->pctl); + if (ret) + return dev_err_probe(dev, ret, + "could not register pinctrl driver\n"); + + sfp->gc.label = dev_name(dev); + sfp->gc.owner = THIS_MODULE; + sfp->gc.request = jh7110_gpio_request; + sfp->gc.free = jh7110_gpio_free; + sfp->gc.get_direction = jh7110_gpio_get_direction; + sfp->gc.direction_input = jh7110_gpio_direction_input; + sfp->gc.direction_output = jh7110_gpio_direction_output; + sfp->gc.get = jh7110_gpio_get; + sfp->gc.set = jh7110_gpio_set; + sfp->gc.set_config = jh7110_gpio_set_config; + sfp->gc.add_pin_ranges = jh7110_gpio_add_pin_ranges; + sfp->gc.base = info->gc_base; + sfp->gc.ngpio = info->ngpios; + + jh7110_irq_chip.name = sfp->gc.label; + gpio_irq_chip_set_chip(&sfp->gc.irq, &jh7110_irq_chip); + sfp->gc.irq.parent_handler = info->jh7110_gpio_irq_handler; + sfp->gc.irq.num_parents = 1; + sfp->gc.irq.parents = devm_kcalloc(dev, sfp->gc.irq.num_parents, + sizeof(*sfp->gc.irq.parents), + GFP_KERNEL); + if (!sfp->gc.irq.parents) + return -ENOMEM; + sfp->gc.irq.default_type = IRQ_TYPE_NONE; + sfp->gc.irq.handler = handle_bad_irq; + sfp->gc.irq.init_hw = info->jh7110_gpio_init_hw; + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return ret; + sfp->gc.irq.parents[0] = ret; + + ret = devm_gpiochip_add_data(dev, &sfp->gc, sfp); + if (ret) + return dev_err_probe(dev, ret, "could not register gpiochip\n"); + + dev_info(dev, "StarFive GPIO chip registered %d GPIOs\n", sfp->gc.ngpio); + + return pinctrl_enable(sfp->pctl); +} +EXPORT_SYMBOL_GPL(jh7110_pinctrl_probe); + +static int jh7110_pinctrl_suspend(struct device *dev) +{ + struct jh7110_pinctrl *sfp = dev_get_drvdata(dev); + unsigned long flags; + unsigned int i; + + raw_spin_lock_irqsave(&sfp->lock, flags); + for (i = 0 ; i < sfp->info->nsaved_regs ; i++) + sfp->saved_regs[i] = readl_relaxed(sfp->base + 4 * i); + + raw_spin_unlock_irqrestore(&sfp->lock, flags); + return 0; +} + +static int jh7110_pinctrl_resume(struct device *dev) +{ + struct jh7110_pinctrl *sfp = dev_get_drvdata(dev); + unsigned long flags; + unsigned int i; + + raw_spin_lock_irqsave(&sfp->lock, flags); + for (i = 0 ; i < sfp->info->nsaved_regs ; i++) + writel_relaxed(sfp->saved_regs[i], sfp->base + 4 * i); + + raw_spin_unlock_irqrestore(&sfp->lock, flags); + return 0; +} + +const struct dev_pm_ops jh7110_pinctrl_pm_ops = { + LATE_SYSTEM_SLEEP_PM_OPS(jh7110_pinctrl_suspend, jh7110_pinctrl_resume) +}; +EXPORT_SYMBOL_GPL(jh7110_pinctrl_pm_ops); + +MODULE_DESCRIPTION("Pinctrl driver for the StarFive JH7110 SoC"); +MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); +MODULE_AUTHOR("Jianlong Huang <jianlong.huang@starfivetech.com>"); +MODULE_LICENSE("GPL"); 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