diff options
Diffstat (limited to 'drivers/pinctrl/mvebu/pinctrl-armada-37xx.c')
| -rw-r--r-- | drivers/pinctrl/mvebu/pinctrl-armada-37xx.c | 1180 |
1 files changed, 1180 insertions, 0 deletions
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c new file mode 100644 index 0000000000..c34719b750 --- /dev/null +++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c @@ -0,0 +1,1180 @@ +/* + * Marvell 37xx SoC pinctrl driver + * + * Copyright (C) 2017 Marvell + * + * Gregory CLEMENT <gregory.clement@free-electrons.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2 or later. This program is licensed "as is" + * without any warranty of any kind, whether express or implied. + */ + +#include <linux/gpio/driver.h> +#include <linux/mfd/syscon.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinmux.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/string_helpers.h> + +#include "../pinctrl-utils.h" + +#define OUTPUT_EN 0x0 +#define INPUT_VAL 0x10 +#define OUTPUT_VAL 0x18 +#define OUTPUT_CTL 0x20 +#define SELECTION 0x30 + +#define IRQ_EN 0x0 +#define IRQ_POL 0x08 +#define IRQ_STATUS 0x10 +#define IRQ_WKUP 0x18 + +#define NB_FUNCS 3 +#define GPIO_PER_REG 32 + +/** + * struct armada_37xx_pin_group: represents group of pins of a pinmux function. + * The pins of a pinmux groups are composed of one or two groups of contiguous + * pins. + * @name: Name of the pin group, used to lookup the group. + * @start_pin: Index of the first pin of the main range of pins belonging to + * the group + * @npins: Number of pins included in the first range + * @reg_mask: Bit mask matching the group in the selection register + * @val: Value to write to the registers for a given function + * @extra_pin: Index of the first pin of the optional second range of pins + * belonging to the group + * @extra_npins:Number of pins included in the second optional range + * @funcs: A list of pinmux functions that can be selected for this group. + * @pins: List of the pins included in the group + */ +struct armada_37xx_pin_group { + const char *name; + unsigned int start_pin; + unsigned int npins; + u32 reg_mask; + u32 val[NB_FUNCS]; + unsigned int extra_pin; + unsigned int extra_npins; + const char *funcs[NB_FUNCS]; + unsigned int *pins; +}; + +struct armada_37xx_pin_data { + u8 nr_pins; + char *name; + struct armada_37xx_pin_group *groups; + int ngroups; +}; + +struct armada_37xx_pmx_func { + const char *name; + const char **groups; + unsigned int ngroups; +}; + +struct armada_37xx_pm_state { + u32 out_en_l; + u32 out_en_h; + u32 out_val_l; + u32 out_val_h; + u32 irq_en_l; + u32 irq_en_h; + u32 irq_pol_l; + u32 irq_pol_h; + u32 selection; +}; + +struct armada_37xx_pinctrl { + struct regmap *regmap; + void __iomem *base; + const struct armada_37xx_pin_data *data; + struct device *dev; + struct gpio_chip gpio_chip; + raw_spinlock_t irq_lock; + struct pinctrl_desc pctl; + struct pinctrl_dev *pctl_dev; + struct armada_37xx_pin_group *groups; + unsigned int ngroups; + struct armada_37xx_pmx_func *funcs; + unsigned int nfuncs; + struct armada_37xx_pm_state pm; +}; + +#define PIN_GRP_GPIO_0(_name, _start, _nr) \ + { \ + .name = _name, \ + .start_pin = _start, \ + .npins = _nr, \ + .reg_mask = 0, \ + .val = {0}, \ + .funcs = {"gpio"} \ + } + +#define PIN_GRP_GPIO(_name, _start, _nr, _mask, _func1) \ + { \ + .name = _name, \ + .start_pin = _start, \ + .npins = _nr, \ + .reg_mask = _mask, \ + .val = {0, _mask}, \ + .funcs = {_func1, "gpio"} \ + } + +#define PIN_GRP_GPIO_2(_name, _start, _nr, _mask, _val1, _val2, _func1) \ + { \ + .name = _name, \ + .start_pin = _start, \ + .npins = _nr, \ + .reg_mask = _mask, \ + .val = {_val1, _val2}, \ + .funcs = {_func1, "gpio"} \ + } + +#define PIN_GRP_GPIO_3(_name, _start, _nr, _mask, _v1, _v2, _v3, _f1, _f2) \ + { \ + .name = _name, \ + .start_pin = _start, \ + .npins = _nr, \ + .reg_mask = _mask, \ + .val = {_v1, _v2, _v3}, \ + .funcs = {_f1, _f2, "gpio"} \ + } + +#define PIN_GRP_EXTRA(_name, _start, _nr, _mask, _v1, _v2, _start2, _nr2, \ + _f1, _f2) \ + { \ + .name = _name, \ + .start_pin = _start, \ + .npins = _nr, \ + .reg_mask = _mask, \ + .val = {_v1, _v2}, \ + .extra_pin = _start2, \ + .extra_npins = _nr2, \ + .funcs = {_f1, _f2} \ + } + +static struct armada_37xx_pin_group armada_37xx_nb_groups[] = { + PIN_GRP_GPIO("jtag", 20, 5, BIT(0), "jtag"), + PIN_GRP_GPIO("sdio0", 8, 3, BIT(1), "sdio"), + PIN_GRP_GPIO("emmc_nb", 27, 9, BIT(2), "emmc"), + PIN_GRP_GPIO_3("pwm0", 11, 1, BIT(3) | BIT(20), 0, BIT(20), BIT(3), + "pwm", "led"), + PIN_GRP_GPIO_3("pwm1", 12, 1, BIT(4) | BIT(21), 0, BIT(21), BIT(4), + "pwm", "led"), + PIN_GRP_GPIO_3("pwm2", 13, 1, BIT(5) | BIT(22), 0, BIT(22), BIT(5), + "pwm", "led"), + PIN_GRP_GPIO_3("pwm3", 14, 1, BIT(6) | BIT(23), 0, BIT(23), BIT(6), + "pwm", "led"), + PIN_GRP_GPIO("pmic1", 7, 1, BIT(7), "pmic"), + PIN_GRP_GPIO("pmic0", 6, 1, BIT(8), "pmic"), + PIN_GRP_GPIO_0("gpio1_5", 5, 1), + PIN_GRP_GPIO("i2c2", 2, 2, BIT(9), "i2c"), + PIN_GRP_GPIO("i2c1", 0, 2, BIT(10), "i2c"), + PIN_GRP_GPIO("spi_cs1", 17, 1, BIT(12), "spi"), + PIN_GRP_GPIO_2("spi_cs2", 18, 1, BIT(13) | BIT(19), 0, BIT(13), "spi"), + PIN_GRP_GPIO_2("spi_cs3", 19, 1, BIT(14) | BIT(19), 0, BIT(14), "spi"), + PIN_GRP_GPIO("onewire", 4, 1, BIT(16), "onewire"), + PIN_GRP_GPIO("uart1", 25, 2, BIT(17), "uart"), + PIN_GRP_GPIO("spi_quad", 15, 2, BIT(18), "spi"), + PIN_GRP_EXTRA("uart2", 9, 2, BIT(1) | BIT(13) | BIT(14) | BIT(19), + BIT(1) | BIT(13) | BIT(14), BIT(1) | BIT(19), + 18, 2, "gpio", "uart"), +}; + +static struct armada_37xx_pin_group armada_37xx_sb_groups[] = { + PIN_GRP_GPIO("usb32_drvvbus0", 0, 1, BIT(0), "drvbus"), + PIN_GRP_GPIO("usb2_drvvbus1", 1, 1, BIT(1), "drvbus"), + PIN_GRP_GPIO_0("gpio2_2", 2, 1), + PIN_GRP_GPIO("sdio_sb", 24, 6, BIT(2), "sdio"), + PIN_GRP_GPIO("rgmii", 6, 12, BIT(3), "mii"), + PIN_GRP_GPIO("smi", 18, 2, BIT(4), "smi"), + PIN_GRP_GPIO("pcie1", 3, 1, BIT(5), "pcie"), /* this actually controls "pcie1_reset" */ + PIN_GRP_GPIO("pcie1_clkreq", 4, 1, BIT(9), "pcie"), + PIN_GRP_GPIO("pcie1_wakeup", 5, 1, BIT(10), "pcie"), + PIN_GRP_GPIO("ptp", 20, 1, BIT(11), "ptp"), + PIN_GRP_GPIO_3("ptp_clk", 21, 1, BIT(6) | BIT(12), 0, BIT(6), BIT(12), + "ptp", "mii"), + PIN_GRP_GPIO_3("ptp_trig", 22, 1, BIT(7) | BIT(13), 0, BIT(7), BIT(13), + "ptp", "mii"), + PIN_GRP_GPIO_3("mii_col", 23, 1, BIT(8) | BIT(14), 0, BIT(8), BIT(14), + "mii", "mii_err"), +}; + +static const struct armada_37xx_pin_data armada_37xx_pin_nb = { + .nr_pins = 36, + .name = "GPIO1", + .groups = armada_37xx_nb_groups, + .ngroups = ARRAY_SIZE(armada_37xx_nb_groups), +}; + +static const struct armada_37xx_pin_data armada_37xx_pin_sb = { + .nr_pins = 30, + .name = "GPIO2", + .groups = armada_37xx_sb_groups, + .ngroups = ARRAY_SIZE(armada_37xx_sb_groups), +}; + +static inline void armada_37xx_update_reg(unsigned int *reg, + unsigned int *offset) +{ + /* We never have more than 2 registers */ + if (*offset >= GPIO_PER_REG) { + *offset -= GPIO_PER_REG; + *reg += sizeof(u32); + } +} + +static struct armada_37xx_pin_group *armada_37xx_find_next_grp_by_pin( + struct armada_37xx_pinctrl *info, int pin, int *grp) +{ + while (*grp < info->ngroups) { + struct armada_37xx_pin_group *group = &info->groups[*grp]; + int j; + + *grp = *grp + 1; + for (j = 0; j < (group->npins + group->extra_npins); j++) + if (group->pins[j] == pin) + return group; + } + return NULL; +} + +static int armada_37xx_pin_config_group_get(struct pinctrl_dev *pctldev, + unsigned int selector, unsigned long *config) +{ + return -ENOTSUPP; +} + +static int armada_37xx_pin_config_group_set(struct pinctrl_dev *pctldev, + unsigned int selector, unsigned long *configs, + unsigned int num_configs) +{ + return -ENOTSUPP; +} + +static const struct pinconf_ops armada_37xx_pinconf_ops = { + .is_generic = true, + .pin_config_group_get = armada_37xx_pin_config_group_get, + .pin_config_group_set = armada_37xx_pin_config_group_set, +}; + +static int armada_37xx_get_groups_count(struct pinctrl_dev *pctldev) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + + return info->ngroups; +} + +static const char *armada_37xx_get_group_name(struct pinctrl_dev *pctldev, + unsigned int group) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + + return info->groups[group].name; +} + +static int armada_37xx_get_group_pins(struct pinctrl_dev *pctldev, + unsigned int selector, + const unsigned int **pins, + unsigned int *npins) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + + if (selector >= info->ngroups) + return -EINVAL; + + *pins = info->groups[selector].pins; + *npins = info->groups[selector].npins + + info->groups[selector].extra_npins; + + return 0; +} + +static const struct pinctrl_ops armada_37xx_pctrl_ops = { + .get_groups_count = armada_37xx_get_groups_count, + .get_group_name = armada_37xx_get_group_name, + .get_group_pins = armada_37xx_get_group_pins, + .dt_node_to_map = pinconf_generic_dt_node_to_map_group, + .dt_free_map = pinctrl_utils_free_map, +}; + +/* + * Pinmux_ops handling + */ + +static int armada_37xx_pmx_get_funcs_count(struct pinctrl_dev *pctldev) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + + return info->nfuncs; +} + +static const char *armada_37xx_pmx_get_func_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + + return info->funcs[selector].name; +} + +static int armada_37xx_pmx_get_groups(struct pinctrl_dev *pctldev, + unsigned int selector, + const char * const **groups, + unsigned int * const num_groups) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + + *groups = info->funcs[selector].groups; + *num_groups = info->funcs[selector].ngroups; + + return 0; +} + +static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev, + const char *name, + struct armada_37xx_pin_group *grp) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + struct device *dev = info->dev; + unsigned int reg = SELECTION; + unsigned int mask = grp->reg_mask; + int func, val; + + dev_dbg(dev, "enable function %s group %s\n", name, grp->name); + + func = match_string(grp->funcs, NB_FUNCS, name); + if (func < 0) + return -ENOTSUPP; + + val = grp->val[func]; + + regmap_update_bits(info->regmap, reg, mask, val); + + return 0; +} + +static int armada_37xx_pmx_set(struct pinctrl_dev *pctldev, + unsigned int selector, + unsigned int group) +{ + + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + struct armada_37xx_pin_group *grp = &info->groups[group]; + const char *name = info->funcs[selector].name; + + return armada_37xx_pmx_set_by_name(pctldev, name, grp); +} + +static inline void armada_37xx_irq_update_reg(unsigned int *reg, + struct irq_data *d) +{ + int offset = irqd_to_hwirq(d); + + armada_37xx_update_reg(reg, &offset); +} + +static int armada_37xx_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + unsigned int reg = OUTPUT_EN; + unsigned int mask; + + armada_37xx_update_reg(®, &offset); + mask = BIT(offset); + + return regmap_update_bits(info->regmap, reg, mask, 0); +} + +static int armada_37xx_gpio_get_direction(struct gpio_chip *chip, + unsigned int offset) +{ + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + unsigned int reg = OUTPUT_EN; + unsigned int val, mask; + + armada_37xx_update_reg(®, &offset); + mask = BIT(offset); + regmap_read(info->regmap, reg, &val); + + if (val & mask) + return GPIO_LINE_DIRECTION_OUT; + + return GPIO_LINE_DIRECTION_IN; +} + +static int armada_37xx_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + unsigned int reg = OUTPUT_EN; + unsigned int mask, val, ret; + + armada_37xx_update_reg(®, &offset); + mask = BIT(offset); + + ret = regmap_update_bits(info->regmap, reg, mask, mask); + + if (ret) + return ret; + + reg = OUTPUT_VAL; + val = value ? mask : 0; + regmap_update_bits(info->regmap, reg, mask, val); + + return 0; +} + +static int armada_37xx_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + unsigned int reg = INPUT_VAL; + unsigned int val, mask; + + armada_37xx_update_reg(®, &offset); + mask = BIT(offset); + + regmap_read(info->regmap, reg, &val); + + return (val & mask) != 0; +} + +static void armada_37xx_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + unsigned int reg = OUTPUT_VAL; + unsigned int mask, val; + + armada_37xx_update_reg(®, &offset); + mask = BIT(offset); + val = value ? mask : 0; + + regmap_update_bits(info->regmap, reg, mask, val); +} + +static int armada_37xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset, bool input) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + struct gpio_chip *chip = range->gc; + + dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n", + offset, range->name, offset, input ? "input" : "output"); + + if (input) + armada_37xx_gpio_direction_input(chip, offset); + else + armada_37xx_gpio_direction_output(chip, offset, 0); + + return 0; +} + +static int armada_37xx_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset) +{ + struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); + struct armada_37xx_pin_group *group; + int grp = 0; + int ret; + + dev_dbg(info->dev, "requesting gpio %d\n", offset); + + while ((group = armada_37xx_find_next_grp_by_pin(info, offset, &grp))) { + ret = armada_37xx_pmx_set_by_name(pctldev, "gpio", group); + if (ret) + return ret; + } + + return 0; +} + +static const struct pinmux_ops armada_37xx_pmx_ops = { + .get_functions_count = armada_37xx_pmx_get_funcs_count, + .get_function_name = armada_37xx_pmx_get_func_name, + .get_function_groups = armada_37xx_pmx_get_groups, + .set_mux = armada_37xx_pmx_set, + .gpio_request_enable = armada_37xx_gpio_request_enable, + .gpio_set_direction = armada_37xx_pmx_gpio_set_direction, +}; + +static const struct gpio_chip armada_37xx_gpiolib_chip = { + .request = gpiochip_generic_request, + .free = gpiochip_generic_free, + .set = armada_37xx_gpio_set, + .get = armada_37xx_gpio_get, + .get_direction = armada_37xx_gpio_get_direction, + .direction_input = armada_37xx_gpio_direction_input, + .direction_output = armada_37xx_gpio_direction_output, + .owner = THIS_MODULE, +}; + +static void armada_37xx_irq_ack(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + u32 reg = IRQ_STATUS; + unsigned long flags; + + armada_37xx_irq_update_reg(®, d); + raw_spin_lock_irqsave(&info->irq_lock, flags); + writel(d->mask, info->base + reg); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); +} + +static void armada_37xx_irq_mask(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + u32 val, reg = IRQ_EN; + unsigned long flags; + + armada_37xx_irq_update_reg(®, d); + raw_spin_lock_irqsave(&info->irq_lock, flags); + val = readl(info->base + reg); + writel(val & ~d->mask, info->base + reg); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + gpiochip_disable_irq(chip, irqd_to_hwirq(d)); +} + +static void armada_37xx_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + u32 val, reg = IRQ_EN; + unsigned long flags; + + gpiochip_enable_irq(chip, irqd_to_hwirq(d)); + armada_37xx_irq_update_reg(®, d); + raw_spin_lock_irqsave(&info->irq_lock, flags); + val = readl(info->base + reg); + writel(val | d->mask, info->base + reg); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); +} + +static int armada_37xx_irq_set_wake(struct irq_data *d, unsigned int on) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + u32 val, reg = IRQ_WKUP; + unsigned long flags; + + armada_37xx_irq_update_reg(®, d); + raw_spin_lock_irqsave(&info->irq_lock, flags); + val = readl(info->base + reg); + if (on) + val |= (BIT(d->hwirq % GPIO_PER_REG)); + else + val &= ~(BIT(d->hwirq % GPIO_PER_REG)); + writel(val, info->base + reg); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + + return 0; +} + +static int armada_37xx_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + u32 val, reg = IRQ_POL; + unsigned long flags; + + raw_spin_lock_irqsave(&info->irq_lock, flags); + armada_37xx_irq_update_reg(®, d); + val = readl(info->base + reg); + switch (type) { + case IRQ_TYPE_EDGE_RISING: + val &= ~(BIT(d->hwirq % GPIO_PER_REG)); + break; + case IRQ_TYPE_EDGE_FALLING: + val |= (BIT(d->hwirq % GPIO_PER_REG)); + break; + case IRQ_TYPE_EDGE_BOTH: { + u32 in_val, in_reg = INPUT_VAL; + + armada_37xx_irq_update_reg(&in_reg, d); + regmap_read(info->regmap, in_reg, &in_val); + + /* Set initial polarity based on current input level. */ + if (in_val & BIT(d->hwirq % GPIO_PER_REG)) + val |= BIT(d->hwirq % GPIO_PER_REG); /* falling */ + else + val &= ~(BIT(d->hwirq % GPIO_PER_REG)); /* rising */ + break; + } + default: + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + return -EINVAL; + } + writel(val, info->base + reg); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + + return 0; +} + +static int armada_37xx_edge_both_irq_swap_pol(struct armada_37xx_pinctrl *info, + u32 pin_idx) +{ + u32 reg_idx = pin_idx / GPIO_PER_REG; + u32 bit_num = pin_idx % GPIO_PER_REG; + u32 p, l, ret; + unsigned long flags; + + regmap_read(info->regmap, INPUT_VAL + 4*reg_idx, &l); + + raw_spin_lock_irqsave(&info->irq_lock, flags); + p = readl(info->base + IRQ_POL + 4 * reg_idx); + if ((p ^ l) & (1 << bit_num)) { + /* + * For the gpios which are used for both-edge irqs, when their + * interrupts happen, their input levels are changed, + * yet their interrupt polarities are kept in old values, we + * should synchronize their interrupt polarities; for example, + * at first a gpio's input level is low and its interrupt + * polarity control is "Detect rising edge", then the gpio has + * a interrupt , its level turns to high, we should change its + * polarity control to "Detect falling edge" correspondingly. + */ + p ^= 1 << bit_num; + writel(p, info->base + IRQ_POL + 4 * reg_idx); + ret = 0; + } else { + /* Spurious irq */ + ret = -1; + } + + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + return ret; +} + +static void armada_37xx_irq_handler(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + struct armada_37xx_pinctrl *info = gpiochip_get_data(gc); + struct irq_domain *d = gc->irq.domain; + int i; + + chained_irq_enter(chip, desc); + for (i = 0; i <= d->revmap_size / GPIO_PER_REG; i++) { + u32 status; + unsigned long flags; + + raw_spin_lock_irqsave(&info->irq_lock, flags); + status = readl_relaxed(info->base + IRQ_STATUS + 4 * i); + /* Manage only the interrupt that was enabled */ + status &= readl_relaxed(info->base + IRQ_EN + 4 * i); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + while (status) { + u32 hwirq = ffs(status) - 1; + u32 virq = irq_find_mapping(d, hwirq + + i * GPIO_PER_REG); + u32 t = irq_get_trigger_type(virq); + + if ((t & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { + /* Swap polarity (race with GPIO line) */ + if (armada_37xx_edge_both_irq_swap_pol(info, + hwirq + i * GPIO_PER_REG)) { + /* + * For spurious irq, which gpio level + * is not as expected after incoming + * edge, just ack the gpio irq. + */ + writel(1 << hwirq, + info->base + + IRQ_STATUS + 4 * i); + goto update_status; + } + } + + generic_handle_irq(virq); + +update_status: + /* Update status in case a new IRQ appears */ + raw_spin_lock_irqsave(&info->irq_lock, flags); + status = readl_relaxed(info->base + + IRQ_STATUS + 4 * i); + /* Manage only the interrupt that was enabled */ + status &= readl_relaxed(info->base + IRQ_EN + 4 * i); + raw_spin_unlock_irqrestore(&info->irq_lock, flags); + } + } + chained_irq_exit(chip, desc); +} + +static unsigned int armada_37xx_irq_startup(struct irq_data *d) +{ + /* + * The mask field is a "precomputed bitmask for accessing the + * chip registers" which was introduced for the generic + * irqchip framework. As we don't use this framework, we can + * reuse this field for our own usage. + */ + d->mask = BIT(d->hwirq % GPIO_PER_REG); + + armada_37xx_irq_unmask(d); + + return 0; +} + +static void armada_37xx_irq_print_chip(struct irq_data *d, struct seq_file *p) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(d); + struct armada_37xx_pinctrl *info = gpiochip_get_data(chip); + + seq_printf(p, info->data->name); +} + +static const struct irq_chip armada_37xx_irqchip = { + .irq_ack = armada_37xx_irq_ack, + .irq_mask = armada_37xx_irq_mask, + .irq_unmask = armada_37xx_irq_unmask, + .irq_set_wake = armada_37xx_irq_set_wake, + .irq_set_type = armada_37xx_irq_set_type, + .irq_startup = armada_37xx_irq_startup, + .irq_print_chip = armada_37xx_irq_print_chip, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static int armada_37xx_irqchip_register(struct platform_device *pdev, + struct armada_37xx_pinctrl *info) +{ + struct gpio_chip *gc = &info->gpio_chip; + struct gpio_irq_chip *girq = &gc->irq; + struct device_node *np = to_of_node(gc->fwnode); + struct device *dev = &pdev->dev; + unsigned int i, nr_irq_parent; + + raw_spin_lock_init(&info->irq_lock); + + nr_irq_parent = of_irq_count(np); + if (!nr_irq_parent) { + dev_err(dev, "invalid or no IRQ\n"); + return 0; + } + + info->base = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(info->base)) + return PTR_ERR(info->base); + + gpio_irq_chip_set_chip(girq, &armada_37xx_irqchip); + girq->parent_handler = armada_37xx_irq_handler; + /* + * Many interrupts are connected to the parent interrupt + * controller. But we do not take advantage of this and use + * the chained irq with all of them. + */ + girq->num_parents = nr_irq_parent; + girq->parents = devm_kcalloc(dev, nr_irq_parent, sizeof(*girq->parents), GFP_KERNEL); + if (!girq->parents) + return -ENOMEM; + for (i = 0; i < nr_irq_parent; i++) { + int irq = irq_of_parse_and_map(np, i); + + if (!irq) + continue; + girq->parents[i] = irq; + } + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_edge_irq; + + return 0; +} + +static int armada_37xx_gpiochip_register(struct platform_device *pdev, + struct armada_37xx_pinctrl *info) +{ + struct device *dev = &pdev->dev; + struct fwnode_handle *fwnode; + struct gpio_chip *gc; + int ret; + + fwnode = gpiochip_node_get_first(dev); + if (!fwnode) + return -ENODEV; + + info->gpio_chip = armada_37xx_gpiolib_chip; + + gc = &info->gpio_chip; + gc->ngpio = info->data->nr_pins; + gc->parent = dev; + gc->base = -1; + gc->fwnode = fwnode; + gc->label = info->data->name; + + ret = armada_37xx_irqchip_register(pdev, info); + if (ret) + return ret; + + return devm_gpiochip_add_data(dev, gc, info); +} + +/** + * armada_37xx_add_function() - Add a new function to the list + * @funcs: array of function to add the new one + * @funcsize: size of the remaining space for the function + * @name: name of the function to add + * + * If it is a new function then create it by adding its name else + * increment the number of group associated to this function. + */ +static int armada_37xx_add_function(struct armada_37xx_pmx_func *funcs, + int *funcsize, const char *name) +{ + int i = 0; + + if (*funcsize <= 0) + return -EOVERFLOW; + + while (funcs->ngroups) { + /* function already there */ + if (strcmp(funcs->name, name) == 0) { + funcs->ngroups++; + + return -EEXIST; + } + funcs++; + i++; + } + + /* append new unique function */ + funcs->name = name; + funcs->ngroups = 1; + (*funcsize)--; + + return 0; +} + +/** + * armada_37xx_fill_group() - complete the group array + * @info: info driver instance + * + * Based on the data available from the armada_37xx_pin_group array + * completes the last member of the struct for each function: the list + * of the groups associated to this function. + * + */ +static int armada_37xx_fill_group(struct armada_37xx_pinctrl *info) +{ + int n, num = 0, funcsize = info->data->nr_pins; + struct device *dev = info->dev; + + for (n = 0; n < info->ngroups; n++) { + struct armada_37xx_pin_group *grp = &info->groups[n]; + int i, j, f; + + grp->pins = devm_kcalloc(dev, grp->npins + grp->extra_npins, + sizeof(*grp->pins), + GFP_KERNEL); + if (!grp->pins) + return -ENOMEM; + + for (i = 0; i < grp->npins; i++) + grp->pins[i] = grp->start_pin + i; + + for (j = 0; j < grp->extra_npins; j++) + grp->pins[i+j] = grp->extra_pin + j; + + for (f = 0; (f < NB_FUNCS) && grp->funcs[f]; f++) { + int ret; + /* check for unique functions and count groups */ + ret = armada_37xx_add_function(info->funcs, &funcsize, + grp->funcs[f]); + if (ret == -EOVERFLOW) + dev_err(dev, "More functions than pins(%d)\n", + info->data->nr_pins); + if (ret < 0) + continue; + num++; + } + } + + info->nfuncs = num; + + return 0; +} + +/** + * armada_37xx_fill_func() - complete the funcs array + * @info: info driver instance + * + * Based on the data available from the armada_37xx_pin_group array + * completes the last two member of the struct for each group: + * - the list of the pins included in the group + * - the list of pinmux functions that can be selected for this group + * + */ +static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info) +{ + struct armada_37xx_pmx_func *funcs = info->funcs; + struct device *dev = info->dev; + int n; + + for (n = 0; n < info->nfuncs; n++) { + const char *name = funcs[n].name; + const char **groups; + int g; + + funcs[n].groups = devm_kcalloc(dev, funcs[n].ngroups, + sizeof(*(funcs[n].groups)), + GFP_KERNEL); + if (!funcs[n].groups) + return -ENOMEM; + + groups = funcs[n].groups; + + for (g = 0; g < info->ngroups; g++) { + struct armada_37xx_pin_group *gp = &info->groups[g]; + int f; + + f = match_string(gp->funcs, NB_FUNCS, name); + if (f < 0) + continue; + + *groups = gp->name; + groups++; + } + } + return 0; +} + +static int armada_37xx_pinctrl_register(struct platform_device *pdev, + struct armada_37xx_pinctrl *info) +{ + const struct armada_37xx_pin_data *pin_data = info->data; + struct pinctrl_desc *ctrldesc = &info->pctl; + struct pinctrl_pin_desc *pindesc, *pdesc; + struct device *dev = &pdev->dev; + char **pin_names; + int pin, ret; + + info->groups = pin_data->groups; + info->ngroups = pin_data->ngroups; + + ctrldesc->name = "armada_37xx-pinctrl"; + ctrldesc->owner = THIS_MODULE; + ctrldesc->pctlops = &armada_37xx_pctrl_ops; + ctrldesc->pmxops = &armada_37xx_pmx_ops; + ctrldesc->confops = &armada_37xx_pinconf_ops; + + pindesc = devm_kcalloc(dev, pin_data->nr_pins, sizeof(*pindesc), GFP_KERNEL); + if (!pindesc) + return -ENOMEM; + + ctrldesc->pins = pindesc; + ctrldesc->npins = pin_data->nr_pins; + + pin_names = devm_kasprintf_strarray(dev, pin_data->name, pin_data->nr_pins); + if (IS_ERR(pin_names)) + return PTR_ERR(pin_names); + + pdesc = pindesc; + for (pin = 0; pin < pin_data->nr_pins; pin++) { + pdesc->number = pin; + pdesc->name = pin_names[pin]; + pdesc++; + } + + /* + * we allocate functions for number of pins and hope there are + * fewer unique functions than pins available + */ + info->funcs = devm_kcalloc(dev, pin_data->nr_pins, sizeof(*info->funcs), GFP_KERNEL); + if (!info->funcs) + return -ENOMEM; + + ret = armada_37xx_fill_group(info); + if (ret) + return ret; + + ret = armada_37xx_fill_func(info); + if (ret) + return ret; + + info->pctl_dev = devm_pinctrl_register(dev, ctrldesc, info); + if (IS_ERR(info->pctl_dev)) + return dev_err_probe(dev, PTR_ERR(info->pctl_dev), "could not register pinctrl driver\n"); + + return 0; +} + +static int armada_3700_pinctrl_suspend(struct device *dev) +{ + struct armada_37xx_pinctrl *info = dev_get_drvdata(dev); + + /* Save GPIO state */ + regmap_read(info->regmap, OUTPUT_EN, &info->pm.out_en_l); + regmap_read(info->regmap, OUTPUT_EN + sizeof(u32), &info->pm.out_en_h); + regmap_read(info->regmap, OUTPUT_VAL, &info->pm.out_val_l); + regmap_read(info->regmap, OUTPUT_VAL + sizeof(u32), + &info->pm.out_val_h); + + info->pm.irq_en_l = readl(info->base + IRQ_EN); + info->pm.irq_en_h = readl(info->base + IRQ_EN + sizeof(u32)); + info->pm.irq_pol_l = readl(info->base + IRQ_POL); + info->pm.irq_pol_h = readl(info->base + IRQ_POL + sizeof(u32)); + + /* Save pinctrl state */ + regmap_read(info->regmap, SELECTION, &info->pm.selection); + + return 0; +} + +static int armada_3700_pinctrl_resume(struct device *dev) +{ + struct armada_37xx_pinctrl *info = dev_get_drvdata(dev); + struct gpio_chip *gc; + struct irq_domain *d; + int i; + + /* Restore GPIO state */ + regmap_write(info->regmap, OUTPUT_EN, info->pm.out_en_l); + regmap_write(info->regmap, OUTPUT_EN + sizeof(u32), + info->pm.out_en_h); + regmap_write(info->regmap, OUTPUT_VAL, info->pm.out_val_l); + regmap_write(info->regmap, OUTPUT_VAL + sizeof(u32), + info->pm.out_val_h); + + /* + * Input levels may change during suspend, which is not monitored at + * that time. GPIOs used for both-edge IRQs may not be synchronized + * anymore with their polarities (rising/falling edge) and must be + * re-configured manually. + */ + gc = &info->gpio_chip; + d = gc->irq.domain; + for (i = 0; i < gc->ngpio; i++) { + u32 irq_bit = BIT(i % GPIO_PER_REG); + u32 mask, *irq_pol, input_reg, virq, type, level; + + if (i < GPIO_PER_REG) { + mask = info->pm.irq_en_l; + irq_pol = &info->pm.irq_pol_l; + input_reg = INPUT_VAL; + } else { + mask = info->pm.irq_en_h; + irq_pol = &info->pm.irq_pol_h; + input_reg = INPUT_VAL + sizeof(u32); + } + + if (!(mask & irq_bit)) + continue; + + virq = irq_find_mapping(d, i); + type = irq_get_trigger_type(virq); + + /* + * Synchronize level and polarity for both-edge irqs: + * - a high input level expects a falling edge, + * - a low input level exepects a rising edge. + */ + if ((type & IRQ_TYPE_SENSE_MASK) == + IRQ_TYPE_EDGE_BOTH) { + regmap_read(info->regmap, input_reg, &level); + if ((*irq_pol ^ level) & irq_bit) + *irq_pol ^= irq_bit; + } + } + + writel(info->pm.irq_en_l, info->base + IRQ_EN); + writel(info->pm.irq_en_h, info->base + IRQ_EN + sizeof(u32)); + writel(info->pm.irq_pol_l, info->base + IRQ_POL); + writel(info->pm.irq_pol_h, info->base + IRQ_POL + sizeof(u32)); + + /* Restore pinctrl state */ + regmap_write(info->regmap, SELECTION, info->pm.selection); + + return 0; +} + +/* + * Since pinctrl is an infrastructure module, its resume should be issued prior + * to other IO drivers. + */ +static DEFINE_NOIRQ_DEV_PM_OPS(armada_3700_pinctrl_pm_ops, + armada_3700_pinctrl_suspend, armada_3700_pinctrl_resume); + +static const struct of_device_id armada_37xx_pinctrl_of_match[] = { + { + .compatible = "marvell,armada3710-sb-pinctrl", + .data = &armada_37xx_pin_sb, + }, + { + .compatible = "marvell,armada3710-nb-pinctrl", + .data = &armada_37xx_pin_nb, + }, + { }, +}; + +static const struct regmap_config armada_37xx_pinctrl_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .use_raw_spinlock = true, +}; + +static int __init armada_37xx_pinctrl_probe(struct platform_device *pdev) +{ + struct armada_37xx_pinctrl *info; + struct device *dev = &pdev->dev; + struct regmap *regmap; + void __iomem *base; + int ret; + + base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); + if (IS_ERR(base)) { + dev_err(dev, "failed to ioremap base address: %pe\n", base); + return PTR_ERR(base); + } + + regmap = devm_regmap_init_mmio(dev, base, + &armada_37xx_pinctrl_regmap_config); + if (IS_ERR(regmap)) { + dev_err(dev, "failed to create regmap: %pe\n", regmap); + return PTR_ERR(regmap); + } + + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->dev = dev; + info->regmap = regmap; + info->data = of_device_get_match_data(dev); + + ret = armada_37xx_pinctrl_register(pdev, info); + if (ret) + return ret; + + ret = armada_37xx_gpiochip_register(pdev, info); + if (ret) + return ret; + + platform_set_drvdata(pdev, info); + + return 0; +} + +static struct platform_driver armada_37xx_pinctrl_driver = { + .driver = { + .name = "armada-37xx-pinctrl", + .of_match_table = armada_37xx_pinctrl_of_match, + .pm = pm_sleep_ptr(&armada_3700_pinctrl_pm_ops), + }, +}; + +builtin_platform_driver_probe(armada_37xx_pinctrl_driver, + armada_37xx_pinctrl_probe); |