diff options
Diffstat (limited to 'drivers/pinctrl/stm32/pinctrl-stm32.c')
| -rw-r--r-- | drivers/pinctrl/stm32/pinctrl-stm32.c | 163 |
1 files changed, 162 insertions, 1 deletions
diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c index 4ae596bf19b5..4f01025a0941 100644 --- a/drivers/pinctrl/stm32/pinctrl-stm32.c +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c @@ -8,6 +8,8 @@ #include <linux/clk.h> #include <linux/gpio/driver.h> #include <linux/io.h> +#include <linux/irq.h> +#include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> @@ -20,6 +22,7 @@ #include <linux/pinctrl/pinctrl.h> #include <linux/pinctrl/pinmux.h> #include <linux/platform_device.h> +#include <linux/regmap.h> #include <linux/reset.h> #include <linux/slab.h> @@ -40,6 +43,7 @@ #define STM32_GPIO_AFRH 0x24 #define STM32_GPIO_PINS_PER_BANK 16 +#define STM32_GPIO_IRQ_LINE 16 #define gpio_range_to_bank(chip) \ container_of(chip, struct stm32_gpio_bank, range) @@ -65,6 +69,8 @@ struct stm32_gpio_bank { spinlock_t lock; struct gpio_chip gpio_chip; struct pinctrl_gpio_range range; + struct fwnode_handle *fwnode; + struct irq_domain *domain; }; struct stm32_pinctrl { @@ -77,6 +83,9 @@ struct stm32_pinctrl { struct stm32_gpio_bank *banks; unsigned nbanks; const struct stm32_pinctrl_match_data *match_data; + struct irq_domain *domain; + struct regmap *regmap; + struct regmap_field *irqmux[STM32_GPIO_PINS_PER_BANK]; }; static inline int stm32_gpio_pin(int gpio) @@ -174,6 +183,20 @@ static int stm32_gpio_direction_output(struct gpio_chip *chip, return 0; } + +static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) +{ + struct stm32_gpio_bank *bank = gpiochip_get_data(chip); + struct irq_fwspec fwspec; + + fwspec.fwnode = bank->fwnode; + fwspec.param_count = 2; + fwspec.param[0] = offset; + fwspec.param[1] = IRQ_TYPE_NONE; + + return irq_create_fwspec_mapping(&fwspec); +} + static struct gpio_chip stm32_gpio_template = { .request = stm32_gpio_request, .free = stm32_gpio_free, @@ -181,10 +204,92 @@ static struct gpio_chip stm32_gpio_template = { .set = stm32_gpio_set, .direction_input = stm32_gpio_direction_input, .direction_output = stm32_gpio_direction_output, + .to_irq = stm32_gpio_to_irq, }; -/* Pinctrl functions */ +static struct irq_chip stm32_gpio_irq_chip = { + .name = "stm32gpio", + .irq_eoi = irq_chip_eoi_parent, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_set_type = irq_chip_set_type_parent, +}; + +static int stm32_gpio_domain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + if ((fwspec->param_count != 2) || + (fwspec->param[0] >= STM32_GPIO_IRQ_LINE)) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1]; + return 0; +} +static void stm32_gpio_domain_activate(struct irq_domain *d, + struct irq_data *irq_data) +{ + struct stm32_gpio_bank *bank = d->host_data; + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + + regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->range.id); +} + +static int stm32_gpio_domain_alloc(struct irq_domain *d, + unsigned int virq, + unsigned int nr_irqs, void *data) +{ + struct stm32_gpio_bank *bank = d->host_data; + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent); + struct irq_fwspec *fwspec = data; + struct irq_fwspec parent_fwspec; + irq_hw_number_t hwirq; + int ret; + + hwirq = fwspec->param[0]; + parent_fwspec.fwnode = d->parent->fwnode; + parent_fwspec.param_count = 2; + parent_fwspec.param[0] = fwspec->param[0]; + parent_fwspec.param[1] = fwspec->param[1]; + + irq_domain_set_hwirq_and_chip(d, virq, hwirq, &stm32_gpio_irq_chip, + bank); + + ret = gpiochip_lock_as_irq(&bank->gpio_chip, hwirq); + if (ret) { + dev_err(pctl->dev, "Unable to configure STM32 %s%ld as IRQ\n", + bank->gpio_chip.label, hwirq); + return ret; + } + + ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &parent_fwspec); + if (ret) + gpiochip_unlock_as_irq(&bank->gpio_chip, hwirq); + + return ret; +} + +static void stm32_gpio_domain_free(struct irq_domain *d, unsigned int virq, + unsigned int nr_irqs) +{ + struct stm32_gpio_bank *bank = d->host_data; + struct irq_data *data = irq_get_irq_data(virq); + + irq_domain_free_irqs_common(d, virq, nr_irqs); + gpiochip_unlock_as_irq(&bank->gpio_chip, data->hwirq); +} + +static const struct irq_domain_ops stm32_gpio_domain_ops = { + .translate = stm32_gpio_domain_translate, + .alloc = stm32_gpio_domain_alloc, + .free = stm32_gpio_domain_free, + .activate = stm32_gpio_domain_activate, +}; + +/* Pinctrl functions */ static struct stm32_pinctrl_group * stm32_pctrl_find_group_by_pin(struct stm32_pinctrl *pctl, u32 pin) { @@ -857,6 +962,17 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, range->pin_base = range->base = range->id * STM32_GPIO_PINS_PER_BANK; range->npins = bank->gpio_chip.ngpio; range->gc = &bank->gpio_chip; + + /* create irq hierarchical domain */ + bank->fwnode = of_node_to_fwnode(np); + + bank->domain = irq_domain_create_hierarchy(pctl->domain, 0, + STM32_GPIO_IRQ_LINE, bank->fwnode, + &stm32_gpio_domain_ops, bank); + + if (!bank->domain) + return -ENODEV; + err = gpiochip_add_data(&bank->gpio_chip, bank); if (err) { dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr); @@ -867,6 +983,47 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, return 0; } +static int stm32_pctrl_dt_setup_irq(struct platform_device *pdev, + struct stm32_pinctrl *pctl) +{ + struct device_node *np = pdev->dev.of_node, *parent; + struct device *dev = &pdev->dev; + struct regmap *rm; + int offset, ret, i; + + parent = of_irq_find_parent(np); + if (!parent) + return -ENXIO; + + pctl->domain = irq_find_host(parent); + if (!pctl->domain) + return -ENXIO; + + pctl->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (IS_ERR(pctl->regmap)) + return PTR_ERR(pctl->regmap); + + rm = pctl->regmap; + + ret = of_property_read_u32_index(np, "st,syscfg", 1, &offset); + if (ret) + return ret; + + for (i = 0; i < STM32_GPIO_PINS_PER_BANK; i++) { + struct reg_field mux; + + mux.reg = offset + (i / 4) * 4; + mux.lsb = (i % 4) * 4; + mux.msb = mux.lsb + 3; + + pctl->irqmux[i] = devm_regmap_field_alloc(dev, rm, mux); + if (IS_ERR(pctl->irqmux[i])) + return PTR_ERR(pctl->irqmux[i]); + } + + return 0; +} + static int stm32_pctrl_build_state(struct platform_device *pdev) { struct stm32_pinctrl *pctl = platform_get_drvdata(pdev); @@ -935,6 +1092,10 @@ int stm32_pctl_probe(struct platform_device *pdev) return -EINVAL; } + ret = stm32_pctrl_dt_setup_irq(pdev, pctl); + if (ret) + return ret; + for_each_child_of_node(np, child) if (of_property_read_bool(child, "gpio-controller")) banks++; |