diff options
Diffstat (limited to 'drivers/pinctrl/mediatek/pinctrl-mtk-common.c')
| -rw-r--r-- | drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 379 |
1 files changed, 378 insertions, 1 deletions
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c index 5d680c89b5d8..7e113e12d526 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c @@ -31,6 +31,7 @@ #include <linux/bitops.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> +#include <linux/delay.h> #include <dt-bindings/pinctrl/mt65xx.h> #include "../core.h" @@ -560,6 +561,21 @@ static int mtk_pmx_set_mode(struct pinctrl_dev *pctldev, reg_addr, mask, val); } +static const struct mtk_desc_pin * +mtk_find_pin_by_eint_num(struct mtk_pinctrl *pctl, unsigned int eint_num) +{ + int i; + const struct mtk_desc_pin *pin; + + for (i = 0; i < pctl->devdata->npins; i++) { + pin = pctl->devdata->pins + i; + if (pin->eint.eintnum == eint_num) + return pin; + } + + return NULL; +} + static int mtk_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned function, unsigned group) @@ -647,6 +663,199 @@ static int mtk_gpio_get(struct gpio_chip *chip, unsigned offset) return !!(read_val & bit); } +static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + const struct mtk_desc_pin *pin; + struct mtk_pinctrl *pctl = dev_get_drvdata(chip->dev); + int irq; + + pin = pctl->devdata->pins + offset; + if (pin->eint.eintnum == NO_EINT_SUPPORT) + return -EINVAL; + + irq = irq_find_mapping(pctl->domain, pin->eint.eintnum); + if (!irq) + return -EINVAL; + + return irq; +} + +static int mtk_pinctrl_irq_request_resources(struct irq_data *d) +{ + struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); + const struct mtk_desc_pin *pin; + int ret; + + pin = mtk_find_pin_by_eint_num(pctl, d->hwirq); + + if (!pin) { + dev_err(pctl->dev, "Can not find pin\n"); + return -EINVAL; + } + + ret = gpiochip_lock_as_irq(pctl->chip, pin->pin.number); + if (ret) { + dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n", + irqd_to_hwirq(d)); + return ret; + } + + /* set mux to INT mode */ + mtk_pmx_set_mode(pctl->pctl_dev, pin->pin.number, pin->eint.eintmux); + + return 0; +} + +static void mtk_pinctrl_irq_release_resources(struct irq_data *d) +{ + struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); + const struct mtk_desc_pin *pin; + + pin = mtk_find_pin_by_eint_num(pctl, d->hwirq); + + if (!pin) { + dev_err(pctl->dev, "Can not find pin\n"); + return; + } + + gpiochip_unlock_as_irq(pctl->chip, pin->pin.number); +} + +static void __iomem *mtk_eint_get_offset(struct mtk_pinctrl *pctl, + unsigned int eint_num, unsigned int offset) +{ + unsigned int eint_base = 0; + void __iomem *reg; + + if (eint_num >= pctl->devdata->ap_num) + eint_base = pctl->devdata->ap_num; + + reg = pctl->eint_reg_base + offset + ((eint_num - eint_base) / 32) * 4; + + return reg; +} + +/* + * mtk_can_en_debounce: Check the EINT number is able to enable debounce or not + * @eint_num: the EINT number to setmtk_pinctrl + */ +static unsigned int mtk_eint_can_en_debounce(struct mtk_pinctrl *pctl, + unsigned int eint_num) +{ + unsigned int sens; + unsigned int bit = BIT(eint_num % 32); + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + + void __iomem *reg = mtk_eint_get_offset(pctl, eint_num, + eint_offsets->sens); + + if (readl(reg) & bit) + sens = MT_LEVEL_SENSITIVE; + else + sens = MT_EDGE_SENSITIVE; + + if ((eint_num < pctl->devdata->db_cnt) && (sens != MT_EDGE_SENSITIVE)) + return 1; + else + return 0; +} + +/* + * mtk_eint_get_mask: To get the eint mask + * @eint_num: the EINT number to get + */ +static unsigned int mtk_eint_get_mask(struct mtk_pinctrl *pctl, + unsigned int eint_num) +{ + unsigned int bit = BIT(eint_num % 32); + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + + void __iomem *reg = mtk_eint_get_offset(pctl, eint_num, + eint_offsets->mask); + + return !!(readl(reg) & bit); +} + +static void mtk_eint_mask(struct irq_data *d) +{ + struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + u32 mask = BIT(d->hwirq & 0x1f); + void __iomem *reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->mask_set); + + writel(mask, reg); +} + +static void mtk_eint_unmask(struct irq_data *d) +{ + struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + u32 mask = BIT(d->hwirq & 0x1f); + void __iomem *reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->mask_clr); + + writel(mask, reg); +} + +static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset, + unsigned debounce) +{ + struct mtk_pinctrl *pctl = dev_get_drvdata(chip->dev); + int eint_num, virq, eint_offset; + unsigned int set_offset, bit, clr_bit, clr_offset, rst, i, unmask, dbnc; + static const unsigned int dbnc_arr[] = {0 , 1, 16, 32, 64, 128, 256}; + const struct mtk_desc_pin *pin; + struct irq_data *d; + + pin = pctl->devdata->pins + offset; + if (pin->eint.eintnum == NO_EINT_SUPPORT) + return -EINVAL; + + eint_num = pin->eint.eintnum; + virq = irq_find_mapping(pctl->domain, eint_num); + eint_offset = (eint_num % 4) * 8; + d = irq_get_irq_data(virq); + + set_offset = (eint_num / 4) * 4 + pctl->devdata->eint_offsets.dbnc_set; + clr_offset = (eint_num / 4) * 4 + pctl->devdata->eint_offsets.dbnc_clr; + if (!mtk_eint_can_en_debounce(pctl, eint_num)) + return -ENOSYS; + + dbnc = ARRAY_SIZE(dbnc_arr); + for (i = 0; i < ARRAY_SIZE(dbnc_arr); i++) { + if (debounce <= dbnc_arr[i]) { + dbnc = i; + break; + } + } + + if (!mtk_eint_get_mask(pctl, eint_num)) { + mtk_eint_mask(d); + unmask = 1; + } + + clr_bit = 0xff << eint_offset; + writel(clr_bit, pctl->eint_reg_base + clr_offset); + + bit = ((dbnc << EINT_DBNC_SET_DBNC_BITS) | EINT_DBNC_SET_EN) << + eint_offset; + rst = EINT_DBNC_RST_BIT << eint_offset; + writel(rst | bit, pctl->eint_reg_base + set_offset); + + /* Delay a while (more than 2T) to wait for hw debounce counter reset + work correctly */ + udelay(1); + if (unmask == 1) + mtk_eint_unmask(d); + + return 0; +} + static struct gpio_chip mtk_gpio_chip = { .owner = THIS_MODULE, .request = mtk_gpio_request, @@ -655,9 +864,134 @@ static struct gpio_chip mtk_gpio_chip = { .direction_output = mtk_gpio_direction_output, .get = mtk_gpio_get, .set = mtk_gpio_set, + .to_irq = mtk_gpio_to_irq, + .set_debounce = mtk_gpio_set_debounce, .of_gpio_n_cells = 2, }; +static int mtk_eint_set_type(struct irq_data *d, + unsigned int type) +{ + struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + u32 mask = BIT(d->hwirq & 0x1f); + void __iomem *reg; + + if (((type & IRQ_TYPE_EDGE_BOTH) && (type & IRQ_TYPE_LEVEL_MASK)) || + ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) || + ((type & IRQ_TYPE_LEVEL_MASK) == IRQ_TYPE_LEVEL_MASK)) { + dev_err(pctl->dev, "Can't configure IRQ%d (EINT%lu) for type 0x%X\n", + d->irq, d->hwirq, type); + return -EINVAL; + } + + if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) { + reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->pol_clr); + writel(mask, reg); + } else { + reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->pol_set); + writel(mask, reg); + } + + if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) { + reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->sens_clr); + writel(mask, reg); + } else { + reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->sens_set); + writel(mask, reg); + } + + return 0; +} + +static void mtk_eint_ack(struct irq_data *d) +{ + struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + u32 mask = BIT(d->hwirq & 0x1f); + void __iomem *reg = mtk_eint_get_offset(pctl, d->hwirq, + eint_offsets->ack); + + writel(mask, reg); +} + +static struct irq_chip mtk_pinctrl_irq_chip = { + .name = "mt-eint", + .irq_mask = mtk_eint_mask, + .irq_unmask = mtk_eint_unmask, + .irq_ack = mtk_eint_ack, + .irq_set_type = mtk_eint_set_type, + .irq_request_resources = mtk_pinctrl_irq_request_resources, + .irq_release_resources = mtk_pinctrl_irq_release_resources, +}; + +static unsigned int mtk_eint_init(struct mtk_pinctrl *pctl) +{ + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + void __iomem *reg = pctl->eint_reg_base + eint_offsets->dom_en; + unsigned int i; + + for (i = 0; i < pctl->devdata->ap_num; i += 32) { + writel(0xffffffff, reg); + reg += 4; + } + return 0; +} + +static inline void +mtk_eint_debounce_process(struct mtk_pinctrl *pctl, int index) +{ + unsigned int rst, ctrl_offset; + unsigned int bit, dbnc; + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + + ctrl_offset = (index / 4) * 4 + eint_offsets->dbnc_ctrl; + dbnc = readl(pctl->eint_reg_base + ctrl_offset); + bit = EINT_DBNC_SET_EN << ((index % 4) * 8); + if ((bit & dbnc) > 0) { + ctrl_offset = (index / 4) * 4 + eint_offsets->dbnc_set; + rst = EINT_DBNC_RST_BIT << ((index % 4) * 8); + writel(rst, pctl->eint_reg_base + ctrl_offset); + } +} + +static void mtk_eint_irq_handler(unsigned irq, struct irq_desc *desc) +{ + struct irq_chip *chip = irq_get_chip(irq); + struct mtk_pinctrl *pctl = irq_get_handler_data(irq); + unsigned int status, eint_num; + int offset, index, virq; + const struct mtk_eint_offsets *eint_offsets = + &pctl->devdata->eint_offsets; + void __iomem *reg = mtk_eint_get_offset(pctl, 0, eint_offsets->stat); + + chained_irq_enter(chip, desc); + for (eint_num = 0; eint_num < pctl->devdata->ap_num; eint_num += 32) { + status = readl(reg); + reg += 4; + while (status) { + offset = __ffs(status); + index = eint_num + offset; + virq = irq_find_mapping(pctl->domain, index); + status &= ~BIT(offset); + + generic_handle_irq(virq); + + if (index < pctl->devdata->db_cnt) + mtk_eint_debounce_process(pctl , index); + } + } + chained_irq_exit(chip, desc); +} + static int mtk_pctrl_build_state(struct platform_device *pdev) { struct mtk_pinctrl *pctl = platform_get_drvdata(pdev); @@ -705,7 +1039,8 @@ int mtk_pctrl_init(struct platform_device *pdev, struct mtk_pinctrl *pctl; struct device_node *np = pdev->dev.of_node, *node; struct property *prop; - int i, ret; + struct resource *res; + int i, ret, irq; pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL); if (!pctl) @@ -786,6 +1121,48 @@ int mtk_pctrl_init(struct platform_device *pdev, goto chip_error; } + /* Get EINT register base from dts. */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Unable to get Pinctrl resource\n"); + ret = -EINVAL; + goto chip_error; + } + + pctl->eint_reg_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pctl->eint_reg_base)) { + ret = -EINVAL; + goto chip_error; + } + + irq = irq_of_parse_and_map(np, 0); + if (!irq) { + dev_err(&pdev->dev, "couldn't parse and map irq\n"); + ret = -EINVAL; + goto chip_error; + } + + pctl->domain = irq_domain_add_linear(np, + pctl->devdata->ap_num, &irq_domain_simple_ops, NULL); + if (!pctl->domain) { + dev_err(&pdev->dev, "Couldn't register IRQ domain\n"); + ret = -ENOMEM; + goto chip_error; + } + + mtk_eint_init(pctl); + for (i = 0; i < pctl->devdata->ap_num; i++) { + int virq = irq_create_mapping(pctl->domain, i); + + irq_set_chip_and_handler(virq, &mtk_pinctrl_irq_chip, + handle_level_irq); + irq_set_chip_data(virq, pctl); + set_irq_flags(virq, IRQF_VALID); + }; + + irq_set_chained_handler(irq, mtk_eint_irq_handler); + irq_set_handler_data(irq, pctl); + set_irq_flags(irq, IRQF_VALID); return 0; chip_error: |