| /* |
| * Driver for the Atmel PIO4 controller |
| * |
| * Copyright (C) 2015 Atmel, |
| * 2015 Ludovic Desroches <ludovic.desroches@atmel.com> |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/gpio.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/platform_device.h> |
| #include <linux/pinctrl/pinconf.h> |
| #include <linux/pinctrl/pinconf-generic.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/pinmux.h> |
| #include <linux/slab.h> |
| #include "core.h" |
| #include "pinconf.h" |
| #include "pinctrl-utils.h" |
| |
| /* |
| * Warning: |
| * In order to not introduce confusion between Atmel PIO groups and pinctrl |
| * framework groups, Atmel PIO groups will be called banks, line is kept to |
| * designed the pin id into this bank. |
| */ |
| |
| #define ATMEL_PIO_MSKR 0x0000 |
| #define ATMEL_PIO_CFGR 0x0004 |
| #define ATMEL_PIO_CFGR_FUNC_MASK GENMASK(2, 0) |
| #define ATMEL_PIO_DIR_MASK BIT(8) |
| #define ATMEL_PIO_PUEN_MASK BIT(9) |
| #define ATMEL_PIO_PDEN_MASK BIT(10) |
| #define ATMEL_PIO_IFEN_MASK BIT(12) |
| #define ATMEL_PIO_IFSCEN_MASK BIT(13) |
| #define ATMEL_PIO_OPD_MASK BIT(14) |
| #define ATMEL_PIO_SCHMITT_MASK BIT(15) |
| #define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26, 24) |
| #define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24) |
| #define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24) |
| #define ATMEL_PIO_CFGR_EVTSEL_BOTH (2 << 24) |
| #define ATMEL_PIO_CFGR_EVTSEL_LOW (3 << 24) |
| #define ATMEL_PIO_CFGR_EVTSEL_HIGH (4 << 24) |
| #define ATMEL_PIO_PDSR 0x0008 |
| #define ATMEL_PIO_LOCKSR 0x000C |
| #define ATMEL_PIO_SODR 0x0010 |
| #define ATMEL_PIO_CODR 0x0014 |
| #define ATMEL_PIO_ODSR 0x0018 |
| #define ATMEL_PIO_IER 0x0020 |
| #define ATMEL_PIO_IDR 0x0024 |
| #define ATMEL_PIO_IMR 0x0028 |
| #define ATMEL_PIO_ISR 0x002C |
| #define ATMEL_PIO_IOFR 0x003C |
| |
| #define ATMEL_PIO_NPINS_PER_BANK 32 |
| #define ATMEL_PIO_BANK(pin_id) (pin_id / ATMEL_PIO_NPINS_PER_BANK) |
| #define ATMEL_PIO_LINE(pin_id) (pin_id % ATMEL_PIO_NPINS_PER_BANK) |
| #define ATMEL_PIO_BANK_OFFSET 0x40 |
| |
| #define ATMEL_GET_PIN_NO(pinfunc) ((pinfunc) & 0xff) |
| #define ATMEL_GET_PIN_FUNC(pinfunc) ((pinfunc >> 16) & 0xf) |
| #define ATMEL_GET_PIN_IOSET(pinfunc) ((pinfunc >> 20) & 0xf) |
| |
| struct atmel_pioctrl_data { |
| unsigned nbanks; |
| }; |
| |
| struct atmel_group { |
| const char *name; |
| u32 pin; |
| }; |
| |
| struct atmel_pin { |
| unsigned pin_id; |
| unsigned mux; |
| unsigned ioset; |
| unsigned bank; |
| unsigned line; |
| const char *device; |
| }; |
| |
| /** |
| * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio) |
| * @reg_base: base address of the controller. |
| * @clk: clock of the controller. |
| * @nbanks: number of PIO groups, it can vary depending on the SoC. |
| * @pinctrl_dev: pinctrl device registered. |
| * @groups: groups table to provide group name and pin in the group to pinctrl. |
| * @group_names: group names table to provide all the group/pin names to |
| * pinctrl or gpio. |
| * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line |
| * fields are set at probe time. Other ones are set when parsing dt |
| * pinctrl. |
| * @npins: number of pins. |
| * @gpio_chip: gpio chip registered. |
| * @irq_domain: irq domain for the gpio controller. |
| * @irqs: table containing the hw irq number of the bank. The index of the |
| * table is the bank id. |
| * @dev: device entry for the Atmel PIO controller. |
| * @node: node of the Atmel PIO controller. |
| */ |
| struct atmel_pioctrl { |
| void __iomem *reg_base; |
| struct clk *clk; |
| unsigned nbanks; |
| struct pinctrl_dev *pinctrl_dev; |
| struct atmel_group *groups; |
| const char * const *group_names; |
| struct atmel_pin **pins; |
| unsigned npins; |
| struct gpio_chip *gpio_chip; |
| struct irq_domain *irq_domain; |
| int *irqs; |
| unsigned *pm_wakeup_sources; |
| unsigned *pm_suspend_backup; |
| struct device *dev; |
| struct device_node *node; |
| }; |
| |
| static const char * const atmel_functions[] = { |
| "GPIO", "A", "B", "C", "D", "E", "F", "G" |
| }; |
| |
| /* --- GPIO --- */ |
| static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl, |
| unsigned int bank, unsigned int reg) |
| { |
| return readl_relaxed(atmel_pioctrl->reg_base |
| + ATMEL_PIO_BANK_OFFSET * bank + reg); |
| } |
| |
| static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl, |
| unsigned int bank, unsigned int reg, |
| unsigned int val) |
| { |
| writel_relaxed(val, atmel_pioctrl->reg_base |
| + ATMEL_PIO_BANK_OFFSET * bank + reg); |
| } |
| |
| static void atmel_gpio_irq_ack(struct irq_data *d) |
| { |
| /* |
| * Nothing to do, interrupt is cleared when reading the status |
| * register. |
| */ |
| } |
| |
| static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned type) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); |
| struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq]; |
| unsigned reg; |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, |
| BIT(pin->line)); |
| reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR); |
| reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK); |
| |
| switch (type) { |
| case IRQ_TYPE_EDGE_RISING: |
| __irq_set_handler_locked(d->irq, handle_edge_irq); |
| reg |= ATMEL_PIO_CFGR_EVTSEL_RISING; |
| break; |
| case IRQ_TYPE_EDGE_FALLING: |
| __irq_set_handler_locked(d->irq, handle_edge_irq); |
| reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING; |
| break; |
| case IRQ_TYPE_EDGE_BOTH: |
| __irq_set_handler_locked(d->irq, handle_edge_irq); |
| reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH; |
| break; |
| case IRQ_TYPE_LEVEL_LOW: |
| __irq_set_handler_locked(d->irq, handle_level_irq); |
| reg |= ATMEL_PIO_CFGR_EVTSEL_LOW; |
| break; |
| case IRQ_TYPE_LEVEL_HIGH: |
| __irq_set_handler_locked(d->irq, handle_level_irq); |
| reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH; |
| break; |
| case IRQ_TYPE_NONE: |
| default: |
| return -EINVAL; |
| } |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg); |
| |
| return 0; |
| } |
| |
| static void atmel_gpio_irq_mask(struct irq_data *d) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); |
| struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq]; |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR, |
| BIT(pin->line)); |
| } |
| |
| static void atmel_gpio_irq_unmask(struct irq_data *d) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); |
| struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq]; |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER, |
| BIT(pin->line)); |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| |
| static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d); |
| int bank = ATMEL_PIO_BANK(d->hwirq); |
| int line = ATMEL_PIO_LINE(d->hwirq); |
| |
| /* The gpio controller has one interrupt line per bank. */ |
| irq_set_irq_wake(atmel_pioctrl->irqs[bank], on); |
| |
| if (on) |
| atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line); |
| else |
| atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line)); |
| |
| return 0; |
| } |
| #else |
| #define atmel_gpio_irq_set_wake NULL |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| static struct irq_chip atmel_gpio_irq_chip = { |
| .name = "GPIO", |
| .irq_ack = atmel_gpio_irq_ack, |
| .irq_mask = atmel_gpio_irq_mask, |
| .irq_unmask = atmel_gpio_irq_unmask, |
| .irq_set_type = atmel_gpio_irq_set_type, |
| .irq_set_wake = atmel_gpio_irq_set_wake, |
| }; |
| |
| static void atmel_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = irq_get_handler_data(irq); |
| struct irq_chip *chip = irq_desc_get_chip(desc); |
| unsigned long isr; |
| int n, bank = -1; |
| |
| /* Find from which bank is the irq received. */ |
| for (n = 0; n < atmel_pioctrl->nbanks; n++) { |
| if (atmel_pioctrl->irqs[n] == irq) { |
| bank = n; |
| break; |
| } |
| } |
| |
| if (bank < 0) { |
| dev_err(atmel_pioctrl->dev, |
| "no bank associated to irq %u\n", irq); |
| return; |
| } |
| |
| chained_irq_enter(chip, desc); |
| |
| for (;;) { |
| isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank, |
| ATMEL_PIO_ISR); |
| isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank, |
| ATMEL_PIO_IMR); |
| if (!isr) |
| break; |
| |
| for_each_set_bit(n, &isr, BITS_PER_LONG) |
| generic_handle_irq(gpio_to_irq(bank * |
| ATMEL_PIO_NPINS_PER_BANK + n)); |
| } |
| |
| chained_irq_exit(chip, desc); |
| } |
| |
| static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev); |
| struct atmel_pin *pin = atmel_pioctrl->pins[offset]; |
| unsigned reg; |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, |
| BIT(pin->line)); |
| reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR); |
| reg &= ~ATMEL_PIO_DIR_MASK; |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg); |
| |
| return 0; |
| } |
| |
| static int atmel_gpio_get(struct gpio_chip *chip, unsigned offset) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev); |
| struct atmel_pin *pin = atmel_pioctrl->pins[offset]; |
| unsigned reg; |
| |
| reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR); |
| |
| return !!(reg & BIT(pin->line)); |
| } |
| |
| static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
| int value) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev); |
| struct atmel_pin *pin = atmel_pioctrl->pins[offset]; |
| unsigned reg; |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, |
| value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR, |
| BIT(pin->line)); |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR, |
| BIT(pin->line)); |
| reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR); |
| reg |= ATMEL_PIO_DIR_MASK; |
| atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg); |
| |
| return 0; |
| } |
| |
| static void atmel_gpio_set(struct gpio_chip *chip, unsigned offset, int val) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev); |
| struct atmel_pin *pin = atmel_pioctrl->pins[offset]; |
| |
| atmel_gpio_write(atmel_pioctrl, pin->bank, |
| val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR, |
| BIT(pin->line)); |
| } |
| |
| static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(chip->dev); |
| |
| return irq_find_mapping(atmel_pioctrl->irq_domain, offset); |
| } |
| |
| static struct gpio_chip atmel_gpio_chip = { |
| .direction_input = atmel_gpio_direction_input, |
| .get = atmel_gpio_get, |
| .direction_output = atmel_gpio_direction_output, |
| .set = atmel_gpio_set, |
| .to_irq = atmel_gpio_to_irq, |
| .base = 0, |
| }; |
| |
| /* --- PINCTRL --- */ |
| static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev, |
| unsigned pin_id) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| unsigned bank = atmel_pioctrl->pins[pin_id]->bank; |
| unsigned line = atmel_pioctrl->pins[pin_id]->line; |
| void __iomem *addr = atmel_pioctrl->reg_base |
| + bank * ATMEL_PIO_BANK_OFFSET; |
| |
| writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR); |
| /* Have to set MSKR first, to access the right pin CFGR. */ |
| wmb(); |
| |
| return readl_relaxed(addr + ATMEL_PIO_CFGR); |
| } |
| |
| static void atmel_pin_config_write(struct pinctrl_dev *pctldev, |
| unsigned pin_id, u32 conf) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| unsigned bank = atmel_pioctrl->pins[pin_id]->bank; |
| unsigned line = atmel_pioctrl->pins[pin_id]->line; |
| void __iomem *addr = atmel_pioctrl->reg_base |
| + bank * ATMEL_PIO_BANK_OFFSET; |
| |
| writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR); |
| /* Have to set MSKR first, to access the right pin CFGR. */ |
| wmb(); |
| writel_relaxed(conf, addr + ATMEL_PIO_CFGR); |
| } |
| |
| static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| |
| return atmel_pioctrl->npins; |
| } |
| |
| static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev, |
| unsigned selector) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| |
| return atmel_pioctrl->groups[selector].name; |
| } |
| |
| static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev, |
| unsigned selector, const unsigned **pins, |
| unsigned *num_pins) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| |
| *pins = (unsigned *)&atmel_pioctrl->groups[selector].pin; |
| *num_pins = 1; |
| |
| return 0; |
| } |
| |
| struct atmel_group *atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, |
| unsigned pin) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| int i; |
| |
| for (i = 0; i < atmel_pioctrl->npins; i++) { |
| struct atmel_group *grp = atmel_pioctrl->groups + i; |
| |
| if (grp->pin == pin) |
| return grp; |
| } |
| |
| return NULL; |
| } |
| |
| static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev, |
| struct device_node *np, |
| u32 pinfunc, const char **grp_name, |
| const char **func_name) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| unsigned pin_id, func_id; |
| struct atmel_group *grp; |
| |
| pin_id = ATMEL_GET_PIN_NO(pinfunc); |
| func_id = ATMEL_GET_PIN_FUNC(pinfunc); |
| |
| if (func_id >= ARRAY_SIZE(atmel_functions)) |
| return -EINVAL; |
| |
| *func_name = atmel_functions[func_id]; |
| |
| grp = atmel_pctl_find_group_by_pin(pctldev, pin_id); |
| if (!grp) |
| return -EINVAL; |
| *grp_name = grp->name; |
| |
| atmel_pioctrl->pins[pin_id]->mux = func_id; |
| atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc); |
| /* Want the device name not the group one. */ |
| if (np->parent == atmel_pioctrl->node) |
| atmel_pioctrl->pins[pin_id]->device = np->name; |
| else |
| atmel_pioctrl->pins[pin_id]->device = np->parent->name; |
| |
| return 0; |
| } |
| |
| static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
| struct device_node *np, |
| struct pinctrl_map **map, |
| unsigned *reserved_maps, |
| unsigned *num_maps) |
| { |
| unsigned num_pins, num_configs, reserve; |
| unsigned long *configs; |
| struct property *pins; |
| bool has_config; |
| u32 pinfunc; |
| int ret, i; |
| |
| pins = of_find_property(np, "pinmux", NULL); |
| if (!pins) |
| return -EINVAL; |
| |
| ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, |
| &num_configs); |
| if (ret < 0) { |
| dev_err(pctldev->dev, "%s: could not parse node property\n", |
| of_node_full_name(np)); |
| return ret; |
| } |
| |
| if (num_configs) |
| has_config = true; |
| |
| num_pins = pins->length / sizeof(u32); |
| if (!num_pins) { |
| dev_err(pctldev->dev, "no pins found in node %s\n", |
| of_node_full_name(np)); |
| return -EINVAL; |
| } |
| |
| /* |
| * Reserve maps, at least there is a mux map and an optional conf |
| * map for each pin. |
| */ |
| reserve = 1; |
| if (has_config && num_pins >= 1) |
| reserve++; |
| reserve *= num_pins; |
| ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, |
| reserve); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < num_pins; i++) { |
| const char *group, *func; |
| |
| ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc); |
| if (ret) |
| return ret; |
| |
| ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group, |
| &func); |
| if (ret) |
| return ret; |
| |
| pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps, |
| group, func); |
| |
| if (has_config) { |
| ret = pinctrl_utils_add_map_configs(pctldev, map, |
| reserved_maps, num_maps, group, |
| configs, num_configs, |
| PIN_MAP_TYPE_CONFIGS_GROUP); |
| if (ret < 0) |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, |
| struct device_node *np_config, |
| struct pinctrl_map **map, |
| unsigned *num_maps) |
| { |
| struct device_node *np; |
| unsigned reserved_maps; |
| int ret; |
| |
| *map = NULL; |
| *num_maps = 0; |
| reserved_maps = 0; |
| |
| /* |
| * If all the pins of a device have the same configuration (or no one), |
| * it is useless to add a subnode, so directly parse node referenced by |
| * phandle. |
| */ |
| ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map, |
| &reserved_maps, num_maps); |
| if (ret) { |
| for_each_child_of_node(np_config, np) { |
| ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map, |
| &reserved_maps, num_maps); |
| if (ret < 0) |
| break; |
| } |
| } |
| |
| if (ret < 0) { |
| pinctrl_utils_dt_free_map(pctldev, *map, *num_maps); |
| dev_err(pctldev->dev, "can't create maps for node %s\n", |
| np_config->full_name); |
| } |
| |
| return ret; |
| } |
| |
| static const struct pinctrl_ops atmel_pctlops = { |
| .get_groups_count = atmel_pctl_get_groups_count, |
| .get_group_name = atmel_pctl_get_group_name, |
| .get_group_pins = atmel_pctl_get_group_pins, |
| .dt_node_to_map = atmel_pctl_dt_node_to_map, |
| .dt_free_map = pinctrl_utils_dt_free_map, |
| }; |
| |
| static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev) |
| { |
| return ARRAY_SIZE(atmel_functions); |
| } |
| |
| static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev, |
| unsigned selector) |
| { |
| return atmel_functions[selector]; |
| } |
| |
| static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev, |
| unsigned selector, |
| const char * const **groups, |
| unsigned * const num_groups) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| |
| *groups = atmel_pioctrl->group_names; |
| *num_groups = atmel_pioctrl->npins; |
| |
| return 0; |
| } |
| |
| static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev, |
| unsigned function, |
| unsigned group) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| unsigned pin; |
| u32 conf; |
| |
| dev_dbg(pctldev->dev, "enable function %s group %s\n", |
| atmel_functions[function], atmel_pioctrl->groups[group].name); |
| |
| pin = atmel_pioctrl->groups[group].pin; |
| conf = atmel_pin_config_read(pctldev, pin); |
| conf &= (~ATMEL_PIO_CFGR_FUNC_MASK); |
| conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK); |
| dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf); |
| atmel_pin_config_write(pctldev, pin, conf); |
| |
| return 0; |
| } |
| |
| static const struct pinmux_ops atmel_pmxops = { |
| .get_functions_count = atmel_pmx_get_functions_count, |
| .get_function_name = atmel_pmx_get_function_name, |
| .get_function_groups = atmel_pmx_get_function_groups, |
| .set_mux = atmel_pmx_set_mux, |
| }; |
| |
| static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev, |
| unsigned group, |
| unsigned long *config) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| unsigned param = pinconf_to_config_param(*config), arg = 0; |
| struct atmel_group *grp = atmel_pioctrl->groups + group; |
| unsigned pin_id = grp->pin; |
| u32 res; |
| |
| res = atmel_pin_config_read(pctldev, pin_id); |
| |
| switch (param) { |
| case PIN_CONFIG_BIAS_PULL_UP: |
| if (!(res & ATMEL_PIO_PUEN_MASK)) |
| return -EINVAL; |
| arg = 1; |
| break; |
| case PIN_CONFIG_BIAS_PULL_DOWN: |
| if ((res & ATMEL_PIO_PUEN_MASK) || |
| (!(res & ATMEL_PIO_PDEN_MASK))) |
| return -EINVAL; |
| arg = 1; |
| break; |
| case PIN_CONFIG_BIAS_DISABLE: |
| if ((res & ATMEL_PIO_PUEN_MASK) || |
| ((res & ATMEL_PIO_PDEN_MASK))) |
| return -EINVAL; |
| arg = 1; |
| break; |
| case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
| if (!(res & ATMEL_PIO_OPD_MASK)) |
| return -EINVAL; |
| arg = 1; |
| break; |
| case PIN_CONFIG_INPUT_SCHMITT_ENABLE: |
| if (!(res & ATMEL_PIO_SCHMITT_MASK)) |
| return -EINVAL; |
| arg = 1; |
| break; |
| default: |
| return -ENOTSUPP; |
| } |
| |
| *config = pinconf_to_config_packed(param, arg); |
| return 0; |
| } |
| |
| static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev, |
| unsigned group, |
| unsigned long *configs, |
| unsigned num_configs) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| struct atmel_group *grp = atmel_pioctrl->groups + group; |
| unsigned bank, pin, pin_id = grp->pin; |
| u32 mask, conf = 0; |
| int i; |
| |
| conf = atmel_pin_config_read(pctldev, pin_id); |
| |
| for (i = 0; i < num_configs; i++) { |
| unsigned param = pinconf_to_config_param(configs[i]); |
| unsigned arg = pinconf_to_config_argument(configs[i]); |
| |
| dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n", |
| __func__, pin_id, configs[i]); |
| |
| switch (param) { |
| case PIN_CONFIG_BIAS_DISABLE: |
| conf &= (~ATMEL_PIO_PUEN_MASK); |
| conf &= (~ATMEL_PIO_PDEN_MASK); |
| break; |
| case PIN_CONFIG_BIAS_PULL_UP: |
| conf |= ATMEL_PIO_PUEN_MASK; |
| break; |
| case PIN_CONFIG_BIAS_PULL_DOWN: |
| conf |= ATMEL_PIO_PDEN_MASK; |
| break; |
| case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
| if (arg == 0) |
| conf &= (~ATMEL_PIO_OPD_MASK); |
| else |
| conf |= ATMEL_PIO_OPD_MASK; |
| break; |
| case PIN_CONFIG_INPUT_SCHMITT_ENABLE: |
| if (arg == 0) |
| conf |= ATMEL_PIO_SCHMITT_MASK; |
| else |
| conf &= (~ATMEL_PIO_SCHMITT_MASK); |
| break; |
| case PIN_CONFIG_INPUT_DEBOUNCE: |
| if (arg == 0) { |
| conf &= (~ATMEL_PIO_IFEN_MASK); |
| conf &= (~ATMEL_PIO_IFSCEN_MASK); |
| } else { |
| /* |
| * We don't care about the debounce value for several reasons: |
| * - can't have different debounce periods inside a same group, |
| * - the register to configure this period is a secure register. |
| * The debouncing filter can filter a pulse with a duration of less |
| * than 1/2 slow clock period. |
| */ |
| conf |= ATMEL_PIO_IFEN_MASK; |
| conf |= ATMEL_PIO_IFSCEN_MASK; |
| } |
| break; |
| case PIN_CONFIG_OUTPUT: |
| conf |= ATMEL_PIO_DIR_MASK; |
| bank = ATMEL_PIO_BANK(pin_id); |
| pin = ATMEL_PIO_LINE(pin_id); |
| mask = 1 << pin; |
| |
| if (arg == 0) { |
| writel_relaxed(mask, atmel_pioctrl->reg_base + |
| bank * ATMEL_PIO_BANK_OFFSET + |
| ATMEL_PIO_CODR); |
| } else { |
| writel_relaxed(mask, atmel_pioctrl->reg_base + |
| bank * ATMEL_PIO_BANK_OFFSET + |
| ATMEL_PIO_SODR); |
| } |
| break; |
| default: |
| dev_warn(pctldev->dev, |
| "unsupported configuration parameter: %u\n", |
| param); |
| continue; |
| } |
| } |
| |
| dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf); |
| atmel_pin_config_write(pctldev, pin_id, conf); |
| |
| return 0; |
| } |
| |
| static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned pin_id) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev); |
| u32 conf; |
| |
| if (!atmel_pioctrl->pins[pin_id]->device) |
| return; |
| |
| if (atmel_pioctrl->pins[pin_id]) |
| seq_printf(s, " (%s, ioset %u) ", |
| atmel_pioctrl->pins[pin_id]->device, |
| atmel_pioctrl->pins[pin_id]->ioset); |
| |
| conf = atmel_pin_config_read(pctldev, pin_id); |
| if (conf & ATMEL_PIO_PUEN_MASK) |
| seq_printf(s, "%s ", "pull-up"); |
| if (conf & ATMEL_PIO_PDEN_MASK) |
| seq_printf(s, "%s ", "pull-down"); |
| if (conf & ATMEL_PIO_IFEN_MASK) |
| seq_printf(s, "%s ", "debounce"); |
| if (conf & ATMEL_PIO_OPD_MASK) |
| seq_printf(s, "%s ", "open-drain"); |
| if (conf & ATMEL_PIO_SCHMITT_MASK) |
| seq_printf(s, "%s ", "schmitt"); |
| } |
| |
| static const struct pinconf_ops atmel_confops = { |
| .pin_config_group_get = atmel_conf_pin_config_group_get, |
| .pin_config_group_set = atmel_conf_pin_config_group_set, |
| .pin_config_dbg_show = atmel_conf_pin_config_dbg_show, |
| }; |
| |
| static struct pinctrl_desc atmel_pinctrl_desc = { |
| .name = "atmel_pinctrl", |
| .confops = &atmel_confops, |
| .pctlops = &atmel_pctlops, |
| .pmxops = &atmel_pmxops, |
| }; |
| |
| static int atmel_pctrl_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev); |
| int i; |
| |
| /* |
| * For each bank, save IMR to restore it later and disable all GPIO |
| * interrupts excepting the ones marked as wakeup sources. |
| */ |
| for (i = 0; i < atmel_pioctrl->nbanks; i++) { |
| atmel_pioctrl->pm_suspend_backup[i] = |
| atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR); |
| atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR, |
| ~atmel_pioctrl->pm_wakeup_sources[i]); |
| } |
| |
| return 0; |
| } |
| |
| static int atmel_pctrl_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev); |
| int i; |
| |
| for (i = 0; i < atmel_pioctrl->nbanks; i++) |
| atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER, |
| atmel_pioctrl->pm_suspend_backup[i]); |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops atmel_pctrl_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume) |
| }; |
| |
| /* |
| * The number of banks can be different from a SoC to another one. |
| * We can have up to 16 banks. |
| */ |
| static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = { |
| .nbanks = 4, |
| }; |
| |
| static const struct of_device_id atmel_pctrl_of_match[] = { |
| { |
| .compatible = "atmel,sama5d2-pinctrl", |
| .data = &atmel_sama5d2_pioctrl_data, |
| }, { |
| /* sentinel */ |
| } |
| }; |
| MODULE_DEVICE_TABLE(of, atmel_pctrl_of_match); |
| |
| static int atmel_pinctrl_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct pinctrl_pin_desc *pin_desc; |
| const char **group_names; |
| const struct of_device_id *match; |
| int i, ret; |
| struct resource *res; |
| struct atmel_pioctrl *atmel_pioctrl; |
| struct atmel_pioctrl_data *atmel_pioctrl_data; |
| |
| atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL); |
| if (!atmel_pioctrl) |
| return -ENOMEM; |
| atmel_pioctrl->dev = dev; |
| atmel_pioctrl->node = dev->of_node; |
| platform_set_drvdata(pdev, atmel_pioctrl); |
| |
| match = of_match_node(atmel_pctrl_of_match, dev->of_node); |
| if (!match) { |
| dev_err(dev, "unknown compatible string\n"); |
| return -ENODEV; |
| } |
| atmel_pioctrl_data = (struct atmel_pioctrl_data *)match->data; |
| atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks; |
| atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) { |
| dev_err(dev, "unable to get atmel pinctrl resource\n"); |
| return -EINVAL; |
| } |
| atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res); |
| if (IS_ERR(atmel_pioctrl->reg_base)) |
| return -EINVAL; |
| |
| atmel_pioctrl->clk = devm_clk_get(dev, NULL); |
| if (IS_ERR(atmel_pioctrl->clk)) { |
| dev_err(dev, "failed to get clock\n"); |
| return PTR_ERR(atmel_pioctrl->clk); |
| } |
| |
| atmel_pioctrl->pins = devm_kzalloc(dev, sizeof(*atmel_pioctrl->pins) |
| * atmel_pioctrl->npins, GFP_KERNEL); |
| if (!atmel_pioctrl->pins) |
| return -ENOMEM; |
| |
| pin_desc = devm_kzalloc(dev, sizeof(*pin_desc) |
| * atmel_pioctrl->npins, GFP_KERNEL); |
| if (!pin_desc) |
| return -ENOMEM; |
| atmel_pinctrl_desc.pins = pin_desc; |
| atmel_pinctrl_desc.npins = atmel_pioctrl->npins; |
| |
| /* One pin is one group since a pin can achieve all functions. */ |
| group_names = devm_kzalloc(dev, sizeof(*group_names) |
| * atmel_pioctrl->npins, GFP_KERNEL); |
| if (!group_names) |
| return -ENOMEM; |
| atmel_pioctrl->group_names = group_names; |
| |
| atmel_pioctrl->groups = devm_kzalloc(&pdev->dev, |
| sizeof(*atmel_pioctrl->groups) * atmel_pioctrl->npins, |
| GFP_KERNEL); |
| if (!atmel_pioctrl->groups) |
| return -ENOMEM; |
| for (i = 0 ; i < atmel_pioctrl->npins; i++) { |
| struct atmel_group *group = atmel_pioctrl->groups + i; |
| unsigned bank = ATMEL_PIO_BANK(i); |
| unsigned line = ATMEL_PIO_LINE(i); |
| |
| atmel_pioctrl->pins[i] = devm_kzalloc(dev, |
| sizeof(**atmel_pioctrl->pins), GFP_KERNEL); |
| if (!atmel_pioctrl->pins[i]) |
| return -ENOMEM; |
| |
| atmel_pioctrl->pins[i]->pin_id = i; |
| atmel_pioctrl->pins[i]->bank = bank; |
| atmel_pioctrl->pins[i]->line = line; |
| |
| pin_desc[i].number = i; |
| /* Pin naming convention: P(bank_name)(bank_pin_number). */ |
| pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d", |
| bank + 'A', line); |
| |
| group->name = group_names[i] = pin_desc[i].name; |
| group->pin = pin_desc[i].number; |
| |
| dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line); |
| } |
| |
| atmel_pioctrl->gpio_chip = &atmel_gpio_chip; |
| atmel_pioctrl->gpio_chip->of_node = dev->of_node; |
| atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins; |
| atmel_pioctrl->gpio_chip->label = dev_name(dev); |
| atmel_pioctrl->gpio_chip->dev = dev; |
| atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names; |
| |
| atmel_pioctrl->pm_wakeup_sources = devm_kzalloc(dev, |
| sizeof(*atmel_pioctrl->pm_wakeup_sources) |
| * atmel_pioctrl->nbanks, GFP_KERNEL); |
| if (!atmel_pioctrl->pm_wakeup_sources) |
| return -ENOMEM; |
| |
| atmel_pioctrl->pm_suspend_backup = devm_kzalloc(dev, |
| sizeof(*atmel_pioctrl->pm_suspend_backup) |
| * atmel_pioctrl->nbanks, GFP_KERNEL); |
| if (!atmel_pioctrl->pm_suspend_backup) |
| return -ENOMEM; |
| |
| atmel_pioctrl->irqs = devm_kzalloc(dev, sizeof(*atmel_pioctrl->irqs) |
| * atmel_pioctrl->nbanks, GFP_KERNEL); |
| if (!atmel_pioctrl->irqs) |
| return -ENOMEM; |
| |
| /* There is one controller but each bank has its own irq line. */ |
| for (i = 0; i < atmel_pioctrl->nbanks; i++) { |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, i); |
| if (!res) { |
| dev_err(dev, "missing irq resource for group %c\n", |
| 'A' + i); |
| return -EINVAL; |
| } |
| atmel_pioctrl->irqs[i] = res->start; |
| irq_set_chained_handler(res->start, atmel_gpio_irq_handler); |
| irq_set_handler_data(res->start, atmel_pioctrl); |
| dev_dbg(dev, "bank %i: hwirq=%u\n", i, res->start); |
| } |
| |
| atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node, |
| atmel_pioctrl->gpio_chip->ngpio, |
| &irq_domain_simple_ops, NULL); |
| if (!atmel_pioctrl->irq_domain) { |
| dev_err(dev, "can't add the irq domain\n"); |
| return -ENODEV; |
| } |
| atmel_pioctrl->irq_domain->name = "atmel gpio"; |
| |
| for (i = 0; i < atmel_pioctrl->npins; i++) { |
| int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i); |
| |
| irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip, |
| handle_simple_irq); |
| irq_set_chip_data(irq, atmel_pioctrl); |
| dev_dbg(dev, |
| "atmel gpio irq domain: hwirq: %d, linux irq: %d\n", |
| i, irq); |
| } |
| |
| ret = clk_prepare_enable(atmel_pioctrl->clk); |
| if (ret) { |
| dev_err(dev, "failed to prepare and enable clock\n"); |
| goto clk_prepare_enable_error; |
| } |
| |
| atmel_pioctrl->pinctrl_dev = pinctrl_register(&atmel_pinctrl_desc, |
| &pdev->dev, |
| atmel_pioctrl); |
| if (!atmel_pioctrl->pinctrl_dev) { |
| dev_err(dev, "pinctrl registration failed\n"); |
| goto pinctrl_register_error; |
| } |
| |
| ret = gpiochip_add(atmel_pioctrl->gpio_chip); |
| if (ret) { |
| dev_err(dev, "failed to add gpiochip\n"); |
| goto gpiochip_add_error; |
| } |
| |
| ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev), |
| 0, 0, atmel_pioctrl->gpio_chip->ngpio); |
| if (ret) { |
| dev_err(dev, "failed to add gpio pin range\n"); |
| goto gpiochip_add_pin_range_error; |
| } |
| |
| dev_info(&pdev->dev, "atmel pinctrl initialized\n"); |
| |
| return 0; |
| |
| clk_prepare_enable_error: |
| irq_domain_remove(atmel_pioctrl->irq_domain); |
| pinctrl_register_error: |
| clk_disable_unprepare(atmel_pioctrl->clk); |
| gpiochip_add_error: |
| pinctrl_unregister(atmel_pioctrl->pinctrl_dev); |
| gpiochip_add_pin_range_error: |
| gpiochip_remove(atmel_pioctrl->gpio_chip); |
| |
| return ret; |
| } |
| |
| int atmel_pinctrl_remove(struct platform_device *pdev) |
| { |
| struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev); |
| |
| irq_domain_remove(atmel_pioctrl->irq_domain); |
| clk_disable_unprepare(atmel_pioctrl->clk); |
| pinctrl_unregister(atmel_pioctrl->pinctrl_dev); |
| gpiochip_remove(atmel_pioctrl->gpio_chip); |
| |
| return 0; |
| } |
| |
| static struct platform_driver atmel_pinctrl_driver = { |
| .driver = { |
| .name = "pinctrl-at91-pio4", |
| .of_match_table = atmel_pctrl_of_match, |
| .pm = &atmel_pctrl_pm_ops, |
| }, |
| .probe = atmel_pinctrl_probe, |
| .remove = atmel_pinctrl_remove, |
| }; |
| module_platform_driver(atmel_pinctrl_driver); |
| |
| MODULE_AUTHOR(Ludovic Desroches <ludovic.desroches@atmel.com>); |
| MODULE_DESCRIPTION("Atmel PIO4 pinctrl driver"); |
| MODULE_LICENSE("GPL v2"); |