/* * at91 pinctrl driver based on at91 pinmux core * * Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD * * Under GPLv2 only */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Since we request GPIOs from ourself */ #include #include #include #include #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 = , * 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: writel_relaxed(mask, pio + PIO_ESR); writel_relaxed(mask, pio + PIO_REHLSR); break; case IRQ_TYPE_EDGE_FALLING: writel_relaxed(mask, pio + PIO_ESR); writel_relaxed(mask, pio + PIO_FELLSR); break; case IRQ_TYPE_LEVEL_LOW: writel_relaxed(mask, pio + PIO_LSR); writel_relaxed(mask, pio + PIO_FELLSR); break; case IRQ_TYPE_LEVEL_HIGH: 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 */ 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 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; if (unlikely(bank >= MAX_GPIO_BANKS)) return -EINVAL; irq_set_irq_wake(at91_gpio->pioc_virq, state); return 0; } #else #define gpio_irq_set_wake NULL #endif 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; 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_and_handler(virq, &gpio_irqchip, 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; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { ret = -ENOENT; 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; } 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 "); MODULE_DESCRIPTION("Atmel AT91 pinctrl driver"); MODULE_LICENSE("GPL v2");