diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-at91-pio4.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-at91-pio4.c | 1149 |
1 files changed, 1149 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c new file mode 100644 index 000000000..9e2f3738b --- /dev/null +++ b/drivers/pinctrl/pinctrl-at91-pio4.c @@ -0,0 +1,1149 @@ +/* + * 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 <dt-bindings/pinctrl/at91.h> +#include <linux/clk.h> +#include <linux/gpio/driver.h> +/* FIXME: needed for gpio_to_irq(), get rid of this */ +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/init.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_DRVSTR_MASK GENMASK(17, 16) +#define ATMEL_PIO_DRVSTR_OFFSET 16 +#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) + +/* Custom pinconf parameters */ +#define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1) + +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; + struct { + u32 imr; + u32 odsr; + u32 cfgr[ATMEL_PIO_NPINS_PER_BANK]; + } *pm_suspend_backup; + struct device *dev; + struct device_node *node; +}; + +static const char * const atmel_functions[] = { + "GPIO", "A", "B", "C", "D", "E", "F", "G" +}; + +static const struct pinconf_generic_params atmel_custom_bindings[] = { + {"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0}, +}; + +/* --- 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, handle_edge_irq); + reg |= ATMEL_PIO_CFGR_EVTSEL_RISING; + break; + case IRQ_TYPE_EDGE_FALLING: + irq_set_handler_locked(d, handle_edge_irq); + reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING; + break; + case IRQ_TYPE_EDGE_BOTH: + irq_set_handler_locked(d, handle_edge_irq); + reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH; + break; + case IRQ_TYPE_LEVEL_LOW: + irq_set_handler_locked(d, handle_level_irq); + reg |= ATMEL_PIO_CFGR_EVTSEL_LOW; + break; + case IRQ_TYPE_LEVEL_HIGH: + irq_set_handler_locked(d, 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(struct irq_desc *desc) +{ + unsigned int irq = irq_desc_get_irq(desc); + struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc); + 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 = gpiochip_get_data(chip); + 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 = gpiochip_get_data(chip); + 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 = gpiochip_get_data(chip); + 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 = gpiochip_get_data(chip); + 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 = gpiochip_get_data(chip); + + 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; +} + +static 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; + 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, "%pOF: could not parse node property\n", + np); + return ret; + } + + num_pins = pins->length / sizeof(u32); + if (!num_pins) { + dev_err(pctldev->dev, "no pins found in node %pOF\n", np); + ret = -EINVAL; + goto exit; + } + + /* + * Reserve maps, at least there is a mux map and an optional conf + * map for each pin. + */ + reserve = 1; + if (num_configs) + reserve++; + reserve *= num_pins; + ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps, + reserve); + if (ret < 0) + goto exit; + + for (i = 0; i < num_pins; i++) { + const char *group, *func; + + ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc); + if (ret) + goto exit; + + ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group, + &func); + if (ret) + goto exit; + + pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps, + group, func); + + if (num_configs) { + ret = pinctrl_utils_add_map_configs(pctldev, map, + reserved_maps, num_maps, group, + configs, num_configs, + PIN_MAP_TYPE_CONFIGS_GROUP); + if (ret < 0) + goto exit; + } + } + +exit: + kfree(configs); + return ret; +} + +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) { + of_node_put(np); + break; + } + } + } + + if (ret < 0) { + pinctrl_utils_free_map(pctldev, *map, *num_maps); + dev_err(pctldev->dev, "can't create maps for node %pOF\n", + np_config); + } + + 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_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; + case ATMEL_PIN_CONFIG_DRIVE_STRENGTH: + if (!(res & ATMEL_PIO_DRVSTR_MASK)) + return -EINVAL; + arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET; + 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; + conf &= (~ATMEL_PIO_PDEN_MASK); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + conf |= ATMEL_PIO_PDEN_MASK; + conf &= (~ATMEL_PIO_PUEN_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; + case ATMEL_PIN_CONFIG_DRIVE_STRENGTH: + switch (arg) { + case ATMEL_PIO_DRVSTR_LO: + case ATMEL_PIO_DRVSTR_ME: + case ATMEL_PIO_DRVSTR_HI: + conf &= (~ATMEL_PIO_DRVSTR_MASK); + conf |= arg << ATMEL_PIO_DRVSTR_OFFSET; + break; + default: + dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n"); + } + 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"); + if (conf & ATMEL_PIO_DRVSTR_MASK) { + switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) { + case ATMEL_PIO_DRVSTR_ME: + seq_printf(s, "%s ", "medium-drive"); + break; + case ATMEL_PIO_DRVSTR_HI: + seq_printf(s, "%s ", "high-drive"); + break; + /* ATMEL_PIO_DRVSTR_LO and 0 which is the default value at reset */ + default: + seq_printf(s, "%s ", "low-drive"); + } + } +} + +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 __maybe_unused 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, j; + + /* + * 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].imr = + atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR); + atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR, + ~atmel_pioctrl->pm_wakeup_sources[i]); + atmel_pioctrl->pm_suspend_backup[i].odsr = + atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR); + for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) { + atmel_gpio_write(atmel_pioctrl, i, + ATMEL_PIO_MSKR, BIT(j)); + atmel_pioctrl->pm_suspend_backup[i].cfgr[j] = + atmel_gpio_read(atmel_pioctrl, i, + ATMEL_PIO_CFGR); + } + } + + return 0; +} + +static int __maybe_unused 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, j; + + for (i = 0; i < atmel_pioctrl->nbanks; i++) { + atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER, + atmel_pioctrl->pm_suspend_backup[i].imr); + atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR, + atmel_pioctrl->pm_suspend_backup[i].odsr); + for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) { + atmel_gpio_write(atmel_pioctrl, i, + ATMEL_PIO_MSKR, BIT(j)); + atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR, + atmel_pioctrl->pm_suspend_backup[i].cfgr[j]); + } + } + + 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 */ + } +}; + +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; + const 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 = 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); + 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_kcalloc(dev, + atmel_pioctrl->npins, + sizeof(*atmel_pioctrl->pins), + GFP_KERNEL); + if (!atmel_pioctrl->pins) + return -ENOMEM; + + pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc), + GFP_KERNEL); + if (!pin_desc) + return -ENOMEM; + atmel_pinctrl_desc.pins = pin_desc; + atmel_pinctrl_desc.npins = atmel_pioctrl->npins; + atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings); + atmel_pinctrl_desc.custom_params = atmel_custom_bindings; + + /* One pin is one group since a pin can achieve all functions. */ + group_names = devm_kcalloc(dev, + atmel_pioctrl->npins, sizeof(*group_names), + GFP_KERNEL); + if (!group_names) + return -ENOMEM; + atmel_pioctrl->group_names = group_names; + + atmel_pioctrl->groups = devm_kcalloc(&pdev->dev, + atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups), + 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->parent = dev; + atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names; + + atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev, + atmel_pioctrl->nbanks, + sizeof(*atmel_pioctrl->pm_wakeup_sources), + GFP_KERNEL); + if (!atmel_pioctrl->pm_wakeup_sources) + return -ENOMEM; + + atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev, + atmel_pioctrl->nbanks, + sizeof(*atmel_pioctrl->pm_suspend_backup), + GFP_KERNEL); + if (!atmel_pioctrl->pm_suspend_backup) + return -ENOMEM; + + atmel_pioctrl->irqs = devm_kcalloc(dev, + atmel_pioctrl->nbanks, + sizeof(*atmel_pioctrl->irqs), + 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: irq=%pr\n", i, res); + } + + 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 = devm_pinctrl_register(&pdev->dev, + &atmel_pinctrl_desc, + atmel_pioctrl); + if (IS_ERR(atmel_pioctrl->pinctrl_dev)) { + ret = PTR_ERR(atmel_pioctrl->pinctrl_dev); + dev_err(dev, "pinctrl registration failed\n"); + goto clk_unprep; + } + + ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl); + if (ret) { + dev_err(dev, "failed to add gpiochip\n"); + goto clk_unprep; + } + + 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; + +gpiochip_add_pin_range_error: + gpiochip_remove(atmel_pioctrl->gpio_chip); + +clk_unprep: + clk_disable_unprepare(atmel_pioctrl->clk); + +clk_prepare_enable_error: + irq_domain_remove(atmel_pioctrl->irq_domain); + + return ret; +} + +static struct platform_driver atmel_pinctrl_driver = { + .driver = { + .name = "pinctrl-at91-pio4", + .of_match_table = atmel_pctrl_of_match, + .pm = &atmel_pctrl_pm_ops, + .suppress_bind_attrs = true, + }, + .probe = atmel_pinctrl_probe, +}; +builtin_platform_driver(atmel_pinctrl_driver); |