| /* |
| * at91 pinctrl driver based on at91 pinmux core |
| * |
| * Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> |
| * |
| * Under GPLv2 only |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/irqdomain.h> |
| #include <linux/irqchip/chained_irq.h> |
| #include <linux/io.h> |
| #include <linux/gpio.h> |
| #include <linux/pinctrl/machine.h> |
| #include <linux/pinctrl/pinconf.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/pinmux.h> |
| /* Since we request GPIOs from ourself */ |
| #include <linux/pinctrl/consumer.h> |
| |
| #include <mach/hardware.h> |
| #include <mach/at91_pio.h> |
| |
| #include "core.h" |
| |
| #define MAX_NB_GPIO_PER_BANK 32 |
| |
| struct at91_pinctrl_mux_ops; |
| |
| struct at91_gpio_chip { |
| struct gpio_chip chip; |
| struct pinctrl_gpio_range range; |
| struct at91_gpio_chip *next; /* Bank sharing same clock */ |
| int pioc_hwirq; /* PIO bank interrupt identifier on AIC */ |
| int pioc_virq; /* PIO bank Linux virtual interrupt */ |
| int pioc_idx; /* PIO bank index */ |
| void __iomem *regbase; /* PIO bank virtual address */ |
| struct clk *clock; /* associated clock */ |
| struct irq_domain *domain; /* associated irq domain */ |
| struct at91_pinctrl_mux_ops *ops; /* ops */ |
| }; |
| |
| #define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip) |
| |
| static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS]; |
| |
| static int gpio_banks; |
| |
| #define PULL_UP (1 << 0) |
| #define MULTI_DRIVE (1 << 1) |
| #define DEGLITCH (1 << 2) |
| #define PULL_DOWN (1 << 3) |
| #define DIS_SCHMIT (1 << 4) |
| #define DEBOUNCE (1 << 16) |
| #define DEBOUNCE_VAL_SHIFT 17 |
| #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT) |
| |
| /** |
| * struct at91_pmx_func - describes AT91 pinmux functions |
| * @name: the name of this specific function |
| * @groups: corresponding pin groups |
| * @ngroups: the number of groups |
| */ |
| struct at91_pmx_func { |
| const char *name; |
| const char **groups; |
| unsigned ngroups; |
| }; |
| |
| enum at91_mux { |
| AT91_MUX_GPIO = 0, |
| AT91_MUX_PERIPH_A = 1, |
| AT91_MUX_PERIPH_B = 2, |
| AT91_MUX_PERIPH_C = 3, |
| AT91_MUX_PERIPH_D = 4, |
| }; |
| |
| /** |
| * struct at91_pmx_pin - describes an At91 pin mux |
| * @bank: the bank of the pin |
| * @pin: the pin number in the @bank |
| * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function. |
| * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc... |
| */ |
| struct at91_pmx_pin { |
| uint32_t bank; |
| uint32_t pin; |
| enum at91_mux mux; |
| unsigned long conf; |
| }; |
| |
| /** |
| * struct at91_pin_group - describes an At91 pin group |
| * @name: the name of this specific pin group |
| * @pins_conf: the mux mode for each pin in this group. The size of this |
| * array is the same as pins. |
| * @pins: an array of discrete physical pins used in this group, taken |
| * from the driver-local pin enumeration space |
| * @npins: the number of pins in this group array, i.e. the number of |
| * elements in .pins so we can iterate over that array |
| */ |
| struct at91_pin_group { |
| const char *name; |
| struct at91_pmx_pin *pins_conf; |
| unsigned int *pins; |
| unsigned npins; |
| }; |
| |
| /** |
| * struct at91_pinctrl_mux_ops - describes an At91 mux ops group |
| * on new IP with support for periph C and D the way to mux in |
| * periph A and B has changed |
| * So provide the right call back |
| * if not present means the IP does not support it |
| * @get_periph: return the periph mode configured |
| * @mux_A_periph: mux as periph A |
| * @mux_B_periph: mux as periph B |
| * @mux_C_periph: mux as periph C |
| * @mux_D_periph: mux as periph D |
| * @get_deglitch: get deglitch status |
| * @set_deglitch: enable/disable deglitch |
| * @get_debounce: get debounce status |
| * @set_debounce: enable/disable debounce |
| * @get_pulldown: get pulldown status |
| * @set_pulldown: enable/disable pulldown |
| * @get_schmitt_trig: get schmitt trigger status |
| * @disable_schmitt_trig: disable schmitt trigger |
| * @irq_type: return irq type |
| */ |
| struct at91_pinctrl_mux_ops { |
| enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask); |
| void (*mux_A_periph)(void __iomem *pio, unsigned mask); |
| void (*mux_B_periph)(void __iomem *pio, unsigned mask); |
| void (*mux_C_periph)(void __iomem *pio, unsigned mask); |
| void (*mux_D_periph)(void __iomem *pio, unsigned mask); |
| bool (*get_deglitch)(void __iomem *pio, unsigned pin); |
| void (*set_deglitch)(void __iomem *pio, unsigned mask, bool in_on); |
| bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div); |
| void (*set_debounce)(void __iomem *pio, unsigned mask, bool in_on, u32 div); |
| bool (*get_pulldown)(void __iomem *pio, unsigned pin); |
| void (*set_pulldown)(void __iomem *pio, unsigned mask, bool in_on); |
| bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin); |
| void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask); |
| /* irq */ |
| int (*irq_type)(struct irq_data *d, unsigned type); |
| }; |
| |
| static int gpio_irq_type(struct irq_data *d, unsigned type); |
| static int alt_gpio_irq_type(struct irq_data *d, unsigned type); |
| |
| struct at91_pinctrl { |
| struct device *dev; |
| struct pinctrl_dev *pctl; |
| |
| int nbanks; |
| |
| uint32_t *mux_mask; |
| int nmux; |
| |
| struct at91_pmx_func *functions; |
| int nfunctions; |
| |
| struct at91_pin_group *groups; |
| int ngroups; |
| |
| struct at91_pinctrl_mux_ops *ops; |
| }; |
| |
| static const inline struct at91_pin_group *at91_pinctrl_find_group_by_name( |
| const struct at91_pinctrl *info, |
| const char *name) |
| { |
| const struct at91_pin_group *grp = NULL; |
| int i; |
| |
| for (i = 0; i < info->ngroups; i++) { |
| if (strcmp(info->groups[i].name, name)) |
| continue; |
| |
| grp = &info->groups[i]; |
| dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]); |
| break; |
| } |
| |
| return grp; |
| } |
| |
| static int at91_get_groups_count(struct pinctrl_dev *pctldev) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| |
| return info->ngroups; |
| } |
| |
| static const char *at91_get_group_name(struct pinctrl_dev *pctldev, |
| unsigned selector) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| |
| return info->groups[selector].name; |
| } |
| |
| static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector, |
| const unsigned **pins, |
| unsigned *npins) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| |
| if (selector >= info->ngroups) |
| return -EINVAL; |
| |
| *pins = info->groups[selector].pins; |
| *npins = info->groups[selector].npins; |
| |
| return 0; |
| } |
| |
| static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, |
| unsigned offset) |
| { |
| seq_printf(s, "%s", dev_name(pctldev->dev)); |
| } |
| |
| static int at91_dt_node_to_map(struct pinctrl_dev *pctldev, |
| struct device_node *np, |
| struct pinctrl_map **map, unsigned *num_maps) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| const struct at91_pin_group *grp; |
| struct pinctrl_map *new_map; |
| struct device_node *parent; |
| int map_num = 1; |
| int i; |
| |
| /* |
| * first find the group of this node and check if we need create |
| * config maps for pins |
| */ |
| grp = at91_pinctrl_find_group_by_name(info, np->name); |
| if (!grp) { |
| dev_err(info->dev, "unable to find group for node %s\n", |
| np->name); |
| return -EINVAL; |
| } |
| |
| map_num += grp->npins; |
| new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, GFP_KERNEL); |
| if (!new_map) |
| return -ENOMEM; |
| |
| *map = new_map; |
| *num_maps = map_num; |
| |
| /* create mux map */ |
| parent = of_get_parent(np); |
| if (!parent) { |
| devm_kfree(pctldev->dev, new_map); |
| return -EINVAL; |
| } |
| new_map[0].type = PIN_MAP_TYPE_MUX_GROUP; |
| new_map[0].data.mux.function = parent->name; |
| new_map[0].data.mux.group = np->name; |
| of_node_put(parent); |
| |
| /* create config map */ |
| new_map++; |
| for (i = 0; i < grp->npins; i++) { |
| new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN; |
| new_map[i].data.configs.group_or_pin = |
| pin_get_name(pctldev, grp->pins[i]); |
| new_map[i].data.configs.configs = &grp->pins_conf[i].conf; |
| new_map[i].data.configs.num_configs = 1; |
| } |
| |
| dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n", |
| (*map)->data.mux.function, (*map)->data.mux.group, map_num); |
| |
| return 0; |
| } |
| |
| static void at91_dt_free_map(struct pinctrl_dev *pctldev, |
| struct pinctrl_map *map, unsigned num_maps) |
| { |
| } |
| |
| static const struct pinctrl_ops at91_pctrl_ops = { |
| .get_groups_count = at91_get_groups_count, |
| .get_group_name = at91_get_group_name, |
| .get_group_pins = at91_get_group_pins, |
| .pin_dbg_show = at91_pin_dbg_show, |
| .dt_node_to_map = at91_dt_node_to_map, |
| .dt_free_map = at91_dt_free_map, |
| }; |
| |
| static void __iomem *pin_to_controller(struct at91_pinctrl *info, |
| unsigned int bank) |
| { |
| return gpio_chips[bank]->regbase; |
| } |
| |
| static inline int pin_to_bank(unsigned pin) |
| { |
| return pin /= MAX_NB_GPIO_PER_BANK; |
| } |
| |
| static unsigned pin_to_mask(unsigned int pin) |
| { |
| return 1 << pin; |
| } |
| |
| static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(mask, pio + PIO_IDR); |
| } |
| |
| static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin) |
| { |
| return (readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1; |
| } |
| |
| static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on) |
| { |
| writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR)); |
| } |
| |
| static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin) |
| { |
| return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1; |
| } |
| |
| static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on) |
| { |
| writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR)); |
| } |
| |
| static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(mask, pio + PIO_ASR); |
| } |
| |
| static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(mask, pio + PIO_BSR); |
| } |
| |
| static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask) |
| { |
| |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, |
| pio + PIO_ABCDSR1); |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask, |
| pio + PIO_ABCDSR2); |
| } |
| |
| static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, |
| pio + PIO_ABCDSR1); |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask, |
| pio + PIO_ABCDSR2); |
| } |
| |
| static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1); |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2); |
| } |
| |
| static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1); |
| writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2); |
| } |
| |
| static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask) |
| { |
| unsigned select; |
| |
| if (readl_relaxed(pio + PIO_PSR) & mask) |
| return AT91_MUX_GPIO; |
| |
| select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask); |
| select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1); |
| |
| return select + 1; |
| } |
| |
| static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask) |
| { |
| unsigned select; |
| |
| if (readl_relaxed(pio + PIO_PSR) & mask) |
| return AT91_MUX_GPIO; |
| |
| select = readl_relaxed(pio + PIO_ABSR) & mask; |
| |
| return select + 1; |
| } |
| |
| static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin) |
| { |
| return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1; |
| } |
| |
| static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on) |
| { |
| __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR)); |
| } |
| |
| static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on) |
| { |
| if (is_on) |
| __raw_writel(mask, pio + PIO_IFSCDR); |
| at91_mux_set_deglitch(pio, mask, is_on); |
| } |
| |
| static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div) |
| { |
| *div = __raw_readl(pio + PIO_SCDR); |
| |
| return (__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1; |
| } |
| |
| static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask, |
| bool is_on, u32 div) |
| { |
| if (is_on) { |
| __raw_writel(mask, pio + PIO_IFSCER); |
| __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR); |
| __raw_writel(mask, pio + PIO_IFER); |
| } else { |
| __raw_writel(mask, pio + PIO_IFDR); |
| } |
| } |
| |
| static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin) |
| { |
| return (__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1; |
| } |
| |
| static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on) |
| { |
| __raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR)); |
| } |
| |
| static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask) |
| { |
| __raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT); |
| } |
| |
| static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin) |
| { |
| return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1; |
| } |
| |
| static struct at91_pinctrl_mux_ops at91rm9200_ops = { |
| .get_periph = at91_mux_get_periph, |
| .mux_A_periph = at91_mux_set_A_periph, |
| .mux_B_periph = at91_mux_set_B_periph, |
| .get_deglitch = at91_mux_get_deglitch, |
| .set_deglitch = at91_mux_set_deglitch, |
| .irq_type = gpio_irq_type, |
| }; |
| |
| static struct at91_pinctrl_mux_ops at91sam9x5_ops = { |
| .get_periph = at91_mux_pio3_get_periph, |
| .mux_A_periph = at91_mux_pio3_set_A_periph, |
| .mux_B_periph = at91_mux_pio3_set_B_periph, |
| .mux_C_periph = at91_mux_pio3_set_C_periph, |
| .mux_D_periph = at91_mux_pio3_set_D_periph, |
| .get_deglitch = at91_mux_get_deglitch, |
| .set_deglitch = at91_mux_pio3_set_deglitch, |
| .get_debounce = at91_mux_pio3_get_debounce, |
| .set_debounce = at91_mux_pio3_set_debounce, |
| .get_pulldown = at91_mux_pio3_get_pulldown, |
| .set_pulldown = at91_mux_pio3_set_pulldown, |
| .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig, |
| .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig, |
| .irq_type = alt_gpio_irq_type, |
| }; |
| |
| static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin) |
| { |
| if (pin->mux) { |
| dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lu\n", |
| pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf); |
| } else { |
| dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lu\n", |
| pin->bank + 'A', pin->pin, pin->conf); |
| } |
| } |
| |
| static int pin_check_config(struct at91_pinctrl *info, const char *name, |
| int index, const struct at91_pmx_pin *pin) |
| { |
| int mux; |
| |
| /* check if it's a valid config */ |
| if (pin->bank >= info->nbanks) { |
| dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n", |
| name, index, pin->bank, info->nbanks); |
| return -EINVAL; |
| } |
| |
| if (pin->pin >= MAX_NB_GPIO_PER_BANK) { |
| dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n", |
| name, index, pin->pin, MAX_NB_GPIO_PER_BANK); |
| return -EINVAL; |
| } |
| |
| if (!pin->mux) |
| return 0; |
| |
| mux = pin->mux - 1; |
| |
| if (mux >= info->nmux) { |
| dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n", |
| name, index, mux, info->nmux); |
| return -EINVAL; |
| } |
| |
| if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) { |
| dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n", |
| name, index, mux, pin->bank + 'A', pin->pin); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask) |
| { |
| writel_relaxed(mask, pio + PIO_PDR); |
| } |
| |
| static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input) |
| { |
| writel_relaxed(mask, pio + PIO_PER); |
| writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER)); |
| } |
| |
| static int at91_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector, |
| unsigned group) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf; |
| const struct at91_pmx_pin *pin; |
| uint32_t npins = info->groups[group].npins; |
| int i, ret; |
| unsigned mask; |
| void __iomem *pio; |
| |
| dev_dbg(info->dev, "enable function %s group %s\n", |
| info->functions[selector].name, info->groups[group].name); |
| |
| /* first check that all the pins of the group are valid with a valid |
| * paramter */ |
| for (i = 0; i < npins; i++) { |
| pin = &pins_conf[i]; |
| ret = pin_check_config(info, info->groups[group].name, i, pin); |
| if (ret) |
| return ret; |
| } |
| |
| for (i = 0; i < npins; i++) { |
| pin = &pins_conf[i]; |
| at91_pin_dbg(info->dev, pin); |
| pio = pin_to_controller(info, pin->bank); |
| mask = pin_to_mask(pin->pin); |
| at91_mux_disable_interrupt(pio, mask); |
| switch (pin->mux) { |
| case AT91_MUX_GPIO: |
| at91_mux_gpio_enable(pio, mask, 1); |
| break; |
| case AT91_MUX_PERIPH_A: |
| info->ops->mux_A_periph(pio, mask); |
| break; |
| case AT91_MUX_PERIPH_B: |
| info->ops->mux_B_periph(pio, mask); |
| break; |
| case AT91_MUX_PERIPH_C: |
| if (!info->ops->mux_C_periph) |
| return -EINVAL; |
| info->ops->mux_C_periph(pio, mask); |
| break; |
| case AT91_MUX_PERIPH_D: |
| if (!info->ops->mux_D_periph) |
| return -EINVAL; |
| info->ops->mux_D_periph(pio, mask); |
| break; |
| } |
| if (pin->mux) |
| at91_mux_gpio_disable(pio, mask); |
| } |
| |
| return 0; |
| } |
| |
| static void at91_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector, |
| unsigned group) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf; |
| const struct at91_pmx_pin *pin; |
| uint32_t npins = info->groups[group].npins; |
| int i; |
| unsigned mask; |
| void __iomem *pio; |
| |
| for (i = 0; i < npins; i++) { |
| pin = &pins_conf[i]; |
| at91_pin_dbg(info->dev, pin); |
| pio = pin_to_controller(info, pin->bank); |
| mask = pin_to_mask(pin->pin); |
| at91_mux_gpio_enable(pio, mask, 1); |
| } |
| } |
| |
| static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| |
| return info->nfunctions; |
| } |
| |
| static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev, |
| unsigned selector) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| |
| return info->functions[selector].name; |
| } |
| |
| static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector, |
| const char * const **groups, |
| unsigned * const num_groups) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| |
| *groups = info->functions[selector].groups; |
| *num_groups = info->functions[selector].ngroups; |
| |
| return 0; |
| } |
| |
| static int at91_gpio_request_enable(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *range, |
| unsigned offset) |
| { |
| struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); |
| struct at91_gpio_chip *at91_chip; |
| struct gpio_chip *chip; |
| unsigned mask; |
| |
| if (!range) { |
| dev_err(npct->dev, "invalid range\n"); |
| return -EINVAL; |
| } |
| if (!range->gc) { |
| dev_err(npct->dev, "missing GPIO chip in range\n"); |
| return -EINVAL; |
| } |
| chip = range->gc; |
| at91_chip = container_of(chip, struct at91_gpio_chip, chip); |
| |
| dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset); |
| |
| mask = 1 << (offset - chip->base); |
| |
| dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n", |
| offset, 'A' + range->id, offset - chip->base, mask); |
| |
| writel_relaxed(mask, at91_chip->regbase + PIO_PER); |
| |
| return 0; |
| } |
| |
| static void at91_gpio_disable_free(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *range, |
| unsigned offset) |
| { |
| struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev); |
| |
| dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset); |
| /* Set the pin to some default state, GPIO is usually default */ |
| } |
| |
| static const struct pinmux_ops at91_pmx_ops = { |
| .get_functions_count = at91_pmx_get_funcs_count, |
| .get_function_name = at91_pmx_get_func_name, |
| .get_function_groups = at91_pmx_get_groups, |
| .enable = at91_pmx_enable, |
| .disable = at91_pmx_disable, |
| .gpio_request_enable = at91_gpio_request_enable, |
| .gpio_disable_free = at91_gpio_disable_free, |
| }; |
| |
| static int at91_pinconf_get(struct pinctrl_dev *pctldev, |
| unsigned pin_id, unsigned long *config) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| void __iomem *pio; |
| unsigned pin; |
| int div; |
| |
| dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, *config); |
| pio = pin_to_controller(info, pin_to_bank(pin_id)); |
| pin = pin_id % MAX_NB_GPIO_PER_BANK; |
| |
| if (at91_mux_get_multidrive(pio, pin)) |
| *config |= MULTI_DRIVE; |
| |
| if (at91_mux_get_pullup(pio, pin)) |
| *config |= PULL_UP; |
| |
| if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin)) |
| *config |= DEGLITCH; |
| if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div)) |
| *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT); |
| if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin)) |
| *config |= PULL_DOWN; |
| if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin)) |
| *config |= DIS_SCHMIT; |
| |
| return 0; |
| } |
| |
| static int at91_pinconf_set(struct pinctrl_dev *pctldev, |
| unsigned pin_id, unsigned long config) |
| { |
| struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev); |
| unsigned mask; |
| void __iomem *pio; |
| |
| dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, config); |
| pio = pin_to_controller(info, pin_to_bank(pin_id)); |
| mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK); |
| |
| if (config & PULL_UP && config & PULL_DOWN) |
| return -EINVAL; |
| |
| at91_mux_set_pullup(pio, mask, config & PULL_UP); |
| at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE); |
| if (info->ops->set_deglitch) |
| info->ops->set_deglitch(pio, mask, config & DEGLITCH); |
| if (info->ops->set_debounce) |
| info->ops->set_debounce(pio, mask, config & DEBOUNCE, |
| (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT); |
| if (info->ops->set_pulldown) |
| info->ops->set_pulldown(pio, mask, config & PULL_DOWN); |
| if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT) |
| info->ops->disable_schmitt_trig(pio, mask); |
| |
| return 0; |
| } |
| |
| static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned pin_id) |
| { |
| |
| } |
| |
| static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned group) |
| { |
| } |
| |
| static const struct pinconf_ops at91_pinconf_ops = { |
| .pin_config_get = at91_pinconf_get, |
| .pin_config_set = at91_pinconf_set, |
| .pin_config_dbg_show = at91_pinconf_dbg_show, |
| .pin_config_group_dbg_show = at91_pinconf_group_dbg_show, |
| }; |
| |
| static struct pinctrl_desc at91_pinctrl_desc = { |
| .pctlops = &at91_pctrl_ops, |
| .pmxops = &at91_pmx_ops, |
| .confops = &at91_pinconf_ops, |
| .owner = THIS_MODULE, |
| }; |
| |
| static const char *gpio_compat = "atmel,at91rm9200-gpio"; |
| |
| static void at91_pinctrl_child_count(struct at91_pinctrl *info, |
| struct device_node *np) |
| { |
| struct device_node *child; |
| |
| for_each_child_of_node(np, child) { |
| if (of_device_is_compatible(child, gpio_compat)) { |
| info->nbanks++; |
| } else { |
| info->nfunctions++; |
| info->ngroups += of_get_child_count(child); |
| } |
| } |
| } |
| |
| static int at91_pinctrl_mux_mask(struct at91_pinctrl *info, |
| struct device_node *np) |
| { |
| int ret = 0; |
| int size; |
| const __be32 *list; |
| |
| list = of_get_property(np, "atmel,mux-mask", &size); |
| if (!list) { |
| dev_err(info->dev, "can not read the mux-mask of %d\n", size); |
| return -EINVAL; |
| } |
| |
| size /= sizeof(*list); |
| if (!size || size % info->nbanks) { |
| dev_err(info->dev, "wrong mux mask array should be by %d\n", info->nbanks); |
| return -EINVAL; |
| } |
| info->nmux = size / info->nbanks; |
| |
| info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL); |
| if (!info->mux_mask) { |
| dev_err(info->dev, "could not alloc mux_mask\n"); |
| return -ENOMEM; |
| } |
| |
| ret = of_property_read_u32_array(np, "atmel,mux-mask", |
| info->mux_mask, size); |
| if (ret) |
| dev_err(info->dev, "can not read the mux-mask of %d\n", size); |
| return ret; |
| } |
| |
| static int at91_pinctrl_parse_groups(struct device_node *np, |
| struct at91_pin_group *grp, |
| struct at91_pinctrl *info, u32 index) |
| { |
| struct at91_pmx_pin *pin; |
| int size; |
| const __be32 *list; |
| int i, j; |
| |
| dev_dbg(info->dev, "group(%d): %s\n", index, np->name); |
| |
| /* Initialise group */ |
| grp->name = np->name; |
| |
| /* |
| * the binding format is atmel,pins = <bank pin mux CONFIG ...>, |
| * do sanity check and calculate pins number |
| */ |
| list = of_get_property(np, "atmel,pins", &size); |
| /* we do not check return since it's safe node passed down */ |
| size /= sizeof(*list); |
| if (!size || size % 4) { |
| dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n"); |
| return -EINVAL; |
| } |
| |
| grp->npins = size / 4; |
| pin = grp->pins_conf = devm_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin), |
| GFP_KERNEL); |
| grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int), |
| GFP_KERNEL); |
| if (!grp->pins_conf || !grp->pins) |
| return -ENOMEM; |
| |
| for (i = 0, j = 0; i < size; i += 4, j++) { |
| pin->bank = be32_to_cpu(*list++); |
| pin->pin = be32_to_cpu(*list++); |
| grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin; |
| pin->mux = be32_to_cpu(*list++); |
| pin->conf = be32_to_cpu(*list++); |
| |
| at91_pin_dbg(info->dev, pin); |
| pin++; |
| } |
| |
| return 0; |
| } |
| |
| static int at91_pinctrl_parse_functions(struct device_node *np, |
| struct at91_pinctrl *info, u32 index) |
| { |
| struct device_node *child; |
| struct at91_pmx_func *func; |
| struct at91_pin_group *grp; |
| int ret; |
| static u32 grp_index; |
| u32 i = 0; |
| |
| dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name); |
| |
| func = &info->functions[index]; |
| |
| /* Initialise function */ |
| func->name = np->name; |
| func->ngroups = of_get_child_count(np); |
| if (func->ngroups <= 0) { |
| dev_err(info->dev, "no groups defined\n"); |
| return -EINVAL; |
| } |
| func->groups = devm_kzalloc(info->dev, |
| func->ngroups * sizeof(char *), GFP_KERNEL); |
| if (!func->groups) |
| return -ENOMEM; |
| |
| for_each_child_of_node(np, child) { |
| func->groups[i] = child->name; |
| grp = &info->groups[grp_index++]; |
| ret = at91_pinctrl_parse_groups(child, grp, info, i++); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static struct of_device_id at91_pinctrl_of_match[] = { |
| { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops }, |
| { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops }, |
| { /* sentinel */ } |
| }; |
| |
| static int at91_pinctrl_probe_dt(struct platform_device *pdev, |
| struct at91_pinctrl *info) |
| { |
| int ret = 0; |
| int i, j; |
| uint32_t *tmp; |
| struct device_node *np = pdev->dev.of_node; |
| struct device_node *child; |
| |
| if (!np) |
| return -ENODEV; |
| |
| info->dev = &pdev->dev; |
| info->ops = (struct at91_pinctrl_mux_ops *) |
| of_match_device(at91_pinctrl_of_match, &pdev->dev)->data; |
| at91_pinctrl_child_count(info, np); |
| |
| if (info->nbanks < 1) { |
| dev_err(&pdev->dev, "you need to specify atleast one gpio-controller\n"); |
| return -EINVAL; |
| } |
| |
| ret = at91_pinctrl_mux_mask(info, np); |
| if (ret) |
| return ret; |
| |
| dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux); |
| |
| dev_dbg(&pdev->dev, "mux-mask\n"); |
| tmp = info->mux_mask; |
| for (i = 0; i < info->nbanks; i++) { |
| for (j = 0; j < info->nmux; j++, tmp++) { |
| dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]); |
| } |
| } |
| |
| dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions); |
| dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups); |
| info->functions = devm_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func), |
| GFP_KERNEL); |
| if (!info->functions) |
| return -ENOMEM; |
| |
| info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct at91_pin_group), |
| GFP_KERNEL); |
| if (!info->groups) |
| return -ENOMEM; |
| |
| dev_dbg(&pdev->dev, "nbanks = %d\n", info->nbanks); |
| dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions); |
| dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups); |
| |
| i = 0; |
| |
| for_each_child_of_node(np, child) { |
| if (of_device_is_compatible(child, gpio_compat)) |
| continue; |
| ret = at91_pinctrl_parse_functions(child, info, i++); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to parse function\n"); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int at91_pinctrl_probe(struct platform_device *pdev) |
| { |
| struct at91_pinctrl *info; |
| struct pinctrl_pin_desc *pdesc; |
| int ret, i, j, k; |
| |
| info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| ret = at91_pinctrl_probe_dt(pdev, info); |
| if (ret) |
| return ret; |
| |
| /* |
| * We need all the GPIO drivers to probe FIRST, or we will not be able |
| * to obtain references to the struct gpio_chip * for them, and we |
| * need this to proceed. |
| */ |
| for (i = 0; i < info->nbanks; i++) { |
| if (!gpio_chips[i]) { |
| dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i); |
| devm_kfree(&pdev->dev, info); |
| return -EPROBE_DEFER; |
| } |
| } |
| |
| at91_pinctrl_desc.name = dev_name(&pdev->dev); |
| at91_pinctrl_desc.npins = info->nbanks * MAX_NB_GPIO_PER_BANK; |
| at91_pinctrl_desc.pins = pdesc = |
| devm_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, GFP_KERNEL); |
| |
| if (!at91_pinctrl_desc.pins) |
| return -ENOMEM; |
| |
| for (i = 0 , k = 0; i < info->nbanks; i++) { |
| for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) { |
| pdesc->number = k; |
| pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j); |
| pdesc++; |
| } |
| } |
| |
| platform_set_drvdata(pdev, info); |
| info->pctl = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, info); |
| |
| if (!info->pctl) { |
| dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| /* We will handle a range of GPIO pins */ |
| for (i = 0; i < info->nbanks; i++) |
| pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range); |
| |
| dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n"); |
| |
| return 0; |
| |
| err: |
| return ret; |
| } |
| |
| static int at91_pinctrl_remove(struct platform_device *pdev) |
| { |
| struct at91_pinctrl *info = platform_get_drvdata(pdev); |
| |
| pinctrl_unregister(info->pctl); |
| |
| return 0; |
| } |
| |
| static int at91_gpio_request(struct gpio_chip *chip, unsigned offset) |
| { |
| /* |
| * Map back to global GPIO space and request muxing, the direction |
| * parameter does not matter for this controller. |
| */ |
| int gpio = chip->base + offset; |
| int bank = chip->base / chip->ngpio; |
| |
| dev_dbg(chip->dev, "%s:%d pio%c%d(%d)\n", __func__, __LINE__, |
| 'A' + bank, offset, gpio); |
| |
| return pinctrl_request_gpio(gpio); |
| } |
| |
| static void at91_gpio_free(struct gpio_chip *chip, unsigned offset) |
| { |
| int gpio = chip->base + offset; |
| |
| pinctrl_free_gpio(gpio); |
| } |
| |
| static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| { |
| struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << offset; |
| |
| writel_relaxed(mask, pio + PIO_ODR); |
| return 0; |
| } |
| |
| static int at91_gpio_get(struct gpio_chip *chip, unsigned offset) |
| { |
| struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << offset; |
| u32 pdsr; |
| |
| pdsr = readl_relaxed(pio + PIO_PDSR); |
| return (pdsr & mask) != 0; |
| } |
| |
| static void at91_gpio_set(struct gpio_chip *chip, unsigned offset, |
| int val) |
| { |
| struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << offset; |
| |
| writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR)); |
| } |
| |
| static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
| int val) |
| { |
| struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << offset; |
| |
| writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR)); |
| writel_relaxed(mask, pio + PIO_OER); |
| |
| return 0; |
| } |
| |
| static int at91_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| { |
| struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); |
| int virq; |
| |
| if (offset < chip->ngpio) |
| virq = irq_create_mapping(at91_gpio->domain, offset); |
| else |
| virq = -ENXIO; |
| |
| dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n", |
| chip->label, offset + chip->base, virq); |
| return virq; |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
| { |
| enum at91_mux mode; |
| int i; |
| struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip); |
| void __iomem *pio = at91_gpio->regbase; |
| |
| for (i = 0; i < chip->ngpio; i++) { |
| unsigned pin = chip->base + i; |
| unsigned mask = pin_to_mask(pin); |
| const char *gpio_label; |
| u32 pdsr; |
| |
| gpio_label = gpiochip_is_requested(chip, i); |
| if (!gpio_label) |
| continue; |
| mode = at91_gpio->ops->get_periph(pio, mask); |
| seq_printf(s, "[%s] GPIO%s%d: ", |
| gpio_label, chip->label, i); |
| if (mode == AT91_MUX_GPIO) { |
| pdsr = readl_relaxed(pio + PIO_PDSR); |
| |
| seq_printf(s, "[gpio] %s\n", |
| pdsr & mask ? |
| "set" : "clear"); |
| } else { |
| seq_printf(s, "[periph %c]\n", |
| mode + 'A' - 1); |
| } |
| } |
| } |
| #else |
| #define at91_gpio_dbg_show NULL |
| #endif |
| |
| /* Several AIC controller irqs are dispatched through this GPIO handler. |
| * To use any AT91_PIN_* as an externally triggered IRQ, first call |
| * at91_set_gpio_input() then maybe enable its glitch filter. |
| * Then just request_irq() with the pin ID; it works like any ARM IRQ |
| * handler. |
| * First implementation always triggers on rising and falling edges |
| * whereas the newer PIO3 can be additionally configured to trigger on |
| * level, edge with any polarity. |
| * |
| * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after |
| * configuring them with at91_set_a_periph() or at91_set_b_periph(). |
| * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering. |
| */ |
| |
| static void gpio_irq_mask(struct irq_data *d) |
| { |
| struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << d->hwirq; |
| |
| if (pio) |
| writel_relaxed(mask, pio + PIO_IDR); |
| } |
| |
| static void gpio_irq_unmask(struct irq_data *d) |
| { |
| struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << d->hwirq; |
| |
| if (pio) |
| writel_relaxed(mask, pio + PIO_IER); |
| } |
| |
| static int gpio_irq_type(struct irq_data *d, unsigned type) |
| { |
| switch (type) { |
| case IRQ_TYPE_NONE: |
| case IRQ_TYPE_EDGE_BOTH: |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /* Alternate irq type for PIO3 support */ |
| static int alt_gpio_irq_type(struct irq_data *d, unsigned type) |
| { |
| struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned mask = 1 << d->hwirq; |
| |
| switch (type) { |
| case IRQ_TYPE_EDGE_RISING: |
| irq_set_handler(d->irq, handle_simple_irq); |
| writel_relaxed(mask, pio + PIO_ESR); |
| writel_relaxed(mask, pio + PIO_REHLSR); |
| break; |
| case IRQ_TYPE_EDGE_FALLING: |
| irq_set_handler(d->irq, handle_simple_irq); |
| writel_relaxed(mask, pio + PIO_ESR); |
| writel_relaxed(mask, pio + PIO_FELLSR); |
| break; |
| case IRQ_TYPE_LEVEL_LOW: |
| irq_set_handler(d->irq, handle_level_irq); |
| writel_relaxed(mask, pio + PIO_LSR); |
| writel_relaxed(mask, pio + PIO_FELLSR); |
| break; |
| case IRQ_TYPE_LEVEL_HIGH: |
| irq_set_handler(d->irq, handle_level_irq); |
| writel_relaxed(mask, pio + PIO_LSR); |
| writel_relaxed(mask, pio + PIO_REHLSR); |
| break; |
| case IRQ_TYPE_EDGE_BOTH: |
| /* |
| * disable additional interrupt modes: |
| * fall back to default behavior |
| */ |
| irq_set_handler(d->irq, handle_simple_irq); |
| writel_relaxed(mask, pio + PIO_AIMDR); |
| return 0; |
| case IRQ_TYPE_NONE: |
| default: |
| pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq)); |
| return -EINVAL; |
| } |
| |
| /* enable additional interrupt modes */ |
| writel_relaxed(mask, pio + PIO_AIMER); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| |
| static u32 wakeups[MAX_GPIO_BANKS]; |
| static u32 backups[MAX_GPIO_BANKS]; |
| |
| static int gpio_irq_set_wake(struct irq_data *d, unsigned state) |
| { |
| struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d); |
| unsigned bank = at91_gpio->pioc_idx; |
| unsigned mask = 1 << d->hwirq; |
| |
| if (unlikely(bank >= MAX_GPIO_BANKS)) |
| return -EINVAL; |
| |
| if (state) |
| wakeups[bank] |= mask; |
| else |
| wakeups[bank] &= ~mask; |
| |
| irq_set_irq_wake(at91_gpio->pioc_virq, state); |
| |
| return 0; |
| } |
| |
| void at91_pinctrl_gpio_suspend(void) |
| { |
| int i; |
| |
| for (i = 0; i < gpio_banks; i++) { |
| void __iomem *pio; |
| |
| if (!gpio_chips[i]) |
| continue; |
| |
| pio = gpio_chips[i]->regbase; |
| |
| backups[i] = __raw_readl(pio + PIO_IMR); |
| __raw_writel(backups[i], pio + PIO_IDR); |
| __raw_writel(wakeups[i], pio + PIO_IER); |
| |
| if (!wakeups[i]) { |
| clk_unprepare(gpio_chips[i]->clock); |
| clk_disable(gpio_chips[i]->clock); |
| } else { |
| printk(KERN_DEBUG "GPIO-%c may wake for %08x\n", |
| 'A'+i, wakeups[i]); |
| } |
| } |
| } |
| |
| void at91_pinctrl_gpio_resume(void) |
| { |
| int i; |
| |
| for (i = 0; i < gpio_banks; i++) { |
| void __iomem *pio; |
| |
| if (!gpio_chips[i]) |
| continue; |
| |
| pio = gpio_chips[i]->regbase; |
| |
| if (!wakeups[i]) { |
| if (clk_prepare(gpio_chips[i]->clock) == 0) |
| clk_enable(gpio_chips[i]->clock); |
| } |
| |
| __raw_writel(wakeups[i], pio + PIO_IDR); |
| __raw_writel(backups[i], pio + PIO_IER); |
| } |
| } |
| |
| #else |
| #define gpio_irq_set_wake NULL |
| #endif /* CONFIG_PM */ |
| |
| static struct irq_chip gpio_irqchip = { |
| .name = "GPIO", |
| .irq_disable = gpio_irq_mask, |
| .irq_mask = gpio_irq_mask, |
| .irq_unmask = gpio_irq_unmask, |
| /* .irq_set_type is set dynamically */ |
| .irq_set_wake = gpio_irq_set_wake, |
| }; |
| |
| static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) |
| { |
| struct irq_chip *chip = irq_desc_get_chip(desc); |
| struct irq_data *idata = irq_desc_get_irq_data(desc); |
| struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata); |
| void __iomem *pio = at91_gpio->regbase; |
| unsigned long isr; |
| int n; |
| |
| chained_irq_enter(chip, desc); |
| for (;;) { |
| /* Reading ISR acks pending (edge triggered) GPIO interrupts. |
| * When there none are pending, we're finished unless we need |
| * to process multiple banks (like ID_PIOCDE on sam9263). |
| */ |
| isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR); |
| if (!isr) { |
| if (!at91_gpio->next) |
| break; |
| at91_gpio = at91_gpio->next; |
| pio = at91_gpio->regbase; |
| continue; |
| } |
| |
| for_each_set_bit(n, &isr, BITS_PER_LONG) { |
| generic_handle_irq(irq_find_mapping(at91_gpio->domain, n)); |
| } |
| } |
| chained_irq_exit(chip, desc); |
| /* now it may re-trigger */ |
| } |
| |
| /* |
| * This lock class tells lockdep that GPIO irqs are in a different |
| * category than their parents, so it won't report false recursion. |
| */ |
| static struct lock_class_key gpio_lock_class; |
| |
| static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq, |
| irq_hw_number_t hw) |
| { |
| struct at91_gpio_chip *at91_gpio = h->host_data; |
| void __iomem *pio = at91_gpio->regbase; |
| u32 mask = 1 << hw; |
| |
| irq_set_lockdep_class(virq, &gpio_lock_class); |
| |
| /* |
| * Can use the "simple" and not "edge" handler since it's |
| * shorter, and the AIC handles interrupts sanely. |
| */ |
| irq_set_chip(virq, &gpio_irqchip); |
| if ((at91_gpio->ops == &at91sam9x5_ops) && |
| (readl_relaxed(pio + PIO_AIMMR) & mask) && |
| (readl_relaxed(pio + PIO_ELSR) & mask)) |
| irq_set_handler(virq, handle_level_irq); |
| else |
| irq_set_handler(virq, handle_simple_irq); |
| set_irq_flags(virq, IRQF_VALID); |
| irq_set_chip_data(virq, at91_gpio); |
| |
| return 0; |
| } |
| |
| static int at91_gpio_irq_domain_xlate(struct irq_domain *d, |
| struct device_node *ctrlr, |
| const u32 *intspec, unsigned int intsize, |
| irq_hw_number_t *out_hwirq, |
| unsigned int *out_type) |
| { |
| struct at91_gpio_chip *at91_gpio = d->host_data; |
| int ret; |
| int pin = at91_gpio->chip.base + intspec[0]; |
| |
| if (WARN_ON(intsize < 2)) |
| return -EINVAL; |
| *out_hwirq = intspec[0]; |
| *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; |
| |
| ret = gpio_request(pin, ctrlr->full_name); |
| if (ret) |
| return ret; |
| |
| ret = gpio_direction_input(pin); |
| if (ret) |
| return ret; |
| |
| return 0; |
| } |
| |
| static struct irq_domain_ops at91_gpio_ops = { |
| .map = at91_gpio_irq_map, |
| .xlate = at91_gpio_irq_domain_xlate, |
| }; |
| |
| static int at91_gpio_of_irq_setup(struct device_node *node, |
| struct at91_gpio_chip *at91_gpio) |
| { |
| struct at91_gpio_chip *prev = NULL; |
| struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq); |
| |
| at91_gpio->pioc_hwirq = irqd_to_hwirq(d); |
| |
| /* Setup proper .irq_set_type function */ |
| gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type; |
| |
| /* Disable irqs of this PIO controller */ |
| writel_relaxed(~0, at91_gpio->regbase + PIO_IDR); |
| |
| /* Setup irq domain */ |
| at91_gpio->domain = irq_domain_add_linear(node, at91_gpio->chip.ngpio, |
| &at91_gpio_ops, at91_gpio); |
| if (!at91_gpio->domain) |
| panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n", |
| at91_gpio->pioc_idx); |
| |
| /* Setup chained handler */ |
| if (at91_gpio->pioc_idx) |
| prev = gpio_chips[at91_gpio->pioc_idx - 1]; |
| |
| /* The toplevel handler handles one bank of GPIOs, except |
| * on some SoC it can handles up to three... |
| * We only set up the handler for the first of the list. |
| */ |
| if (prev && prev->next == at91_gpio) |
| return 0; |
| |
| irq_set_chip_data(at91_gpio->pioc_virq, at91_gpio); |
| irq_set_chained_handler(at91_gpio->pioc_virq, gpio_irq_handler); |
| |
| return 0; |
| } |
| |
| /* This structure is replicated for each GPIO block allocated at probe time */ |
| static struct gpio_chip at91_gpio_template = { |
| .request = at91_gpio_request, |
| .free = at91_gpio_free, |
| .direction_input = at91_gpio_direction_input, |
| .get = at91_gpio_get, |
| .direction_output = at91_gpio_direction_output, |
| .set = at91_gpio_set, |
| .to_irq = at91_gpio_to_irq, |
| .dbg_show = at91_gpio_dbg_show, |
| .can_sleep = 0, |
| .ngpio = MAX_NB_GPIO_PER_BANK, |
| }; |
| |
| static void at91_gpio_probe_fixup(void) |
| { |
| unsigned i; |
| struct at91_gpio_chip *at91_gpio, *last = NULL; |
| |
| for (i = 0; i < gpio_banks; i++) { |
| at91_gpio = gpio_chips[i]; |
| |
| /* |
| * GPIO controller are grouped on some SoC: |
| * PIOC, PIOD and PIOE can share the same IRQ line |
| */ |
| if (last && last->pioc_virq == at91_gpio->pioc_virq) |
| last->next = at91_gpio; |
| last = at91_gpio; |
| } |
| } |
| |
| static struct of_device_id at91_gpio_of_match[] = { |
| { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, }, |
| { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops }, |
| { /* sentinel */ } |
| }; |
| |
| static int at91_gpio_probe(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct resource *res; |
| struct at91_gpio_chip *at91_chip = NULL; |
| struct gpio_chip *chip; |
| struct pinctrl_gpio_range *range; |
| int ret = 0; |
| int irq, i; |
| int alias_idx = of_alias_get_id(np, "gpio"); |
| uint32_t ngpio; |
| char **names; |
| |
| BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips)); |
| if (gpio_chips[alias_idx]) { |
| ret = -EBUSY; |
| goto err; |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| ret = irq; |
| goto err; |
| } |
| |
| at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL); |
| if (!at91_chip) { |
| ret = -ENOMEM; |
| goto err; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| at91_chip->regbase = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(at91_chip->regbase)) { |
| ret = PTR_ERR(at91_chip->regbase); |
| goto err; |
| } |
| |
| at91_chip->ops = (struct at91_pinctrl_mux_ops *) |
| of_match_device(at91_gpio_of_match, &pdev->dev)->data; |
| at91_chip->pioc_virq = irq; |
| at91_chip->pioc_idx = alias_idx; |
| |
| at91_chip->clock = clk_get(&pdev->dev, NULL); |
| if (IS_ERR(at91_chip->clock)) { |
| dev_err(&pdev->dev, "failed to get clock, ignoring.\n"); |
| goto err; |
| } |
| |
| if (clk_prepare(at91_chip->clock)) |
| goto clk_prep_err; |
| |
| /* enable PIO controller's clock */ |
| if (clk_enable(at91_chip->clock)) { |
| dev_err(&pdev->dev, "failed to enable clock, ignoring.\n"); |
| goto clk_err; |
| } |
| |
| at91_chip->chip = at91_gpio_template; |
| |
| chip = &at91_chip->chip; |
| chip->of_node = np; |
| chip->label = dev_name(&pdev->dev); |
| chip->dev = &pdev->dev; |
| chip->owner = THIS_MODULE; |
| chip->base = alias_idx * MAX_NB_GPIO_PER_BANK; |
| |
| if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) { |
| if (ngpio >= MAX_NB_GPIO_PER_BANK) |
| pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n", |
| alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK); |
| else |
| chip->ngpio = ngpio; |
| } |
| |
| names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio, |
| GFP_KERNEL); |
| |
| if (!names) { |
| ret = -ENOMEM; |
| goto clk_err; |
| } |
| |
| for (i = 0; i < chip->ngpio; i++) |
| names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i); |
| |
| chip->names = (const char *const *)names; |
| |
| range = &at91_chip->range; |
| range->name = chip->label; |
| range->id = alias_idx; |
| range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK; |
| |
| range->npins = chip->ngpio; |
| range->gc = chip; |
| |
| ret = gpiochip_add(chip); |
| if (ret) |
| goto clk_err; |
| |
| gpio_chips[alias_idx] = at91_chip; |
| gpio_banks = max(gpio_banks, alias_idx + 1); |
| |
| at91_gpio_probe_fixup(); |
| |
| at91_gpio_of_irq_setup(np, at91_chip); |
| |
| dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase); |
| |
| return 0; |
| |
| clk_err: |
| clk_unprepare(at91_chip->clock); |
| clk_prep_err: |
| clk_put(at91_chip->clock); |
| err: |
| dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx); |
| |
| return ret; |
| } |
| |
| static struct platform_driver at91_gpio_driver = { |
| .driver = { |
| .name = "gpio-at91", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(at91_gpio_of_match), |
| }, |
| .probe = at91_gpio_probe, |
| }; |
| |
| static struct platform_driver at91_pinctrl_driver = { |
| .driver = { |
| .name = "pinctrl-at91", |
| .owner = THIS_MODULE, |
| .of_match_table = of_match_ptr(at91_pinctrl_of_match), |
| }, |
| .probe = at91_pinctrl_probe, |
| .remove = at91_pinctrl_remove, |
| }; |
| |
| static int __init at91_pinctrl_init(void) |
| { |
| int ret; |
| |
| ret = platform_driver_register(&at91_gpio_driver); |
| if (ret) |
| return ret; |
| return platform_driver_register(&at91_pinctrl_driver); |
| } |
| arch_initcall(at91_pinctrl_init); |
| |
| static void __exit at91_pinctrl_exit(void) |
| { |
| platform_driver_unregister(&at91_pinctrl_driver); |
| } |
| |
| module_exit(at91_pinctrl_exit); |
| MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>"); |
| MODULE_DESCRIPTION("Atmel AT91 pinctrl driver"); |
| MODULE_LICENSE("GPL v2"); |