From 3221f40b7631183b0c7a2e5d4be00cab12d983c3 Mon Sep 17 00:00:00 2001 From: Yingjoe Chen Date: Tue, 27 Jan 2015 14:15:26 +0800 Subject: [PATCH] pinctrl: mediatek: emulate GPIO interrupt on both-edges MTK EINT does not support generating interrupt on both edges. Emulate this by changing edge polarity while enable irq, set types and interrupt handling. This follows an example of drivers/gpio/gpio-mxc.c. Signed-off-by: Yingjoe Chen Signed-off-by: Chaotian Jing Acked-by: Hongzhou Yang Signed-off-by: Linus Walleij --- drivers/pinctrl/mediatek/pinctrl-mt8135.c | 3 + drivers/pinctrl/mediatek/pinctrl-mt8173.c | 3 + drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 76 ++++++++++++++++++- drivers/pinctrl/mediatek/pinctrl-mtk-common.h | 4 + 4 files changed, 83 insertions(+), 3 deletions(-) diff --git a/drivers/pinctrl/mediatek/pinctrl-mt8135.c b/drivers/pinctrl/mediatek/pinctrl-mt8135.c index b6ee2b2ea715..1296d6d6fb13 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mt8135.c +++ b/drivers/pinctrl/mediatek/pinctrl-mt8135.c @@ -325,6 +325,9 @@ static const struct mtk_pinctrl_devdata mt8135_pinctrl_data = { .sens = 0x140, .sens_set = 0x180, .sens_clr = 0x1c0, + .soft = 0x200, + .soft_set = 0x240, + .soft_clr = 0x280, .pol = 0x300, .pol_set = 0x340, .pol_clr = 0x380, diff --git a/drivers/pinctrl/mediatek/pinctrl-mt8173.c b/drivers/pinctrl/mediatek/pinctrl-mt8173.c index 66b01bb11778..f07cafbcb170 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mt8173.c +++ b/drivers/pinctrl/mediatek/pinctrl-mt8173.c @@ -405,6 +405,9 @@ static const struct mtk_pinctrl_devdata mt8173_pinctrl_data = { .sens = 0x140, .sens_set = 0x180, .sens_clr = 0x1c0, + .soft = 0x200, + .soft_set = 0x240, + .soft_clr = 0x280, .pol = 0x300, .pol_set = 0x340, .pol_clr = 0x380, diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c index 2864fe333ad9..a82ae1a6141d 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c @@ -792,6 +792,32 @@ static unsigned int mtk_eint_get_mask(struct mtk_pinctrl *pctl, return !!(readl(reg) & bit); } +static int mtk_eint_flip_edge(struct mtk_pinctrl *pctl, int hwirq) +{ + int start_level, curr_level; + unsigned int reg_offset; + const struct mtk_eint_offsets *eint_offsets = &(pctl->devdata->eint_offsets); + u32 mask = 1 << (hwirq & 0x1f); + u32 port = (hwirq >> 5) & eint_offsets->port_mask; + void __iomem *reg = pctl->eint_reg_base + (port << 2); + const struct mtk_desc_pin *pin; + + pin = mtk_find_pin_by_eint_num(pctl, hwirq); + curr_level = mtk_gpio_get(pctl->chip, pin->pin.number); + do { + start_level = curr_level; + if (start_level) + reg_offset = eint_offsets->pol_clr; + else + reg_offset = eint_offsets->pol_set; + writel(mask, reg + reg_offset); + + curr_level = mtk_gpio_get(pctl->chip, pin->pin.number); + } while (start_level != curr_level); + + return start_level; +} + static void mtk_eint_mask(struct irq_data *d) { struct mtk_pinctrl *pctl = irq_data_get_irq_chip_data(d); @@ -814,6 +840,9 @@ static void mtk_eint_unmask(struct irq_data *d) eint_offsets->mask_clr); writel(mask, reg); + + if (pctl->eint_dual_edges[d->hwirq]) + mtk_eint_flip_edge(pctl, d->hwirq); } static int mtk_gpio_set_debounce(struct gpio_chip *chip, unsigned offset, @@ -893,13 +922,17 @@ static int mtk_eint_set_type(struct irq_data *d, 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_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) + pctl->eint_dual_edges[d->hwirq] = 1; + else + pctl->eint_dual_edges[d->hwirq] = 0; + if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) { reg = mtk_eint_get_offset(pctl, d->hwirq, eint_offsets->pol_clr); @@ -920,6 +953,9 @@ static int mtk_eint_set_type(struct irq_data *d, writel(mask, reg); } + if (pctl->eint_dual_edges[d->hwirq]) + mtk_eint_flip_edge(pctl, d->hwirq); + return 0; } @@ -986,6 +1022,8 @@ static void mtk_eint_irq_handler(unsigned irq, struct irq_desc *desc) const struct mtk_eint_offsets *eint_offsets = &pctl->devdata->eint_offsets; void __iomem *reg = mtk_eint_get_offset(pctl, 0, eint_offsets->stat); + int dual_edges, start_level, curr_level; + const struct mtk_desc_pin *pin; chained_irq_enter(chip, desc); for (eint_num = 0; eint_num < pctl->devdata->ap_num; eint_num += 32) { @@ -997,8 +1035,31 @@ static void mtk_eint_irq_handler(unsigned irq, struct irq_desc *desc) virq = irq_find_mapping(pctl->domain, index); status &= ~BIT(offset); + dual_edges = pctl->eint_dual_edges[index]; + if (dual_edges) { + /* Clear soft-irq in case we raised it + last time */ + writel(BIT(offset), reg - eint_offsets->stat + + eint_offsets->soft_clr); + + pin = mtk_find_pin_by_eint_num(pctl, index); + start_level = mtk_gpio_get(pctl->chip, + pin->pin.number); + } + generic_handle_irq(virq); + if (dual_edges) { + curr_level = mtk_eint_flip_edge(pctl, index); + + /* If level changed, we might lost one edge + interrupt, raised it through soft-irq */ + if (start_level != curr_level) + writel(BIT(offset), reg - + eint_offsets->stat + + eint_offsets->soft_set); + } + if (index < pctl->devdata->db_cnt) mtk_eint_debounce_process(pctl , index); } @@ -1149,11 +1210,18 @@ int mtk_pctrl_init(struct platform_device *pdev, goto chip_error; } + pctl->eint_dual_edges = devm_kzalloc(&pdev->dev, + sizeof(int) * pctl->devdata->ap_num, GFP_KERNEL); + if (!pctl->eint_dual_edges) { + ret = -ENOMEM; + 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; + goto free_edges; } pctl->domain = irq_domain_add_linear(np, @@ -1161,7 +1229,7 @@ int mtk_pctrl_init(struct platform_device *pdev, if (!pctl->domain) { dev_err(&pdev->dev, "Couldn't register IRQ domain\n"); ret = -ENOMEM; - goto chip_error; + goto free_edges; } mtk_eint_init(pctl); @@ -1179,6 +1247,8 @@ int mtk_pctrl_init(struct platform_device *pdev, set_irq_flags(irq, IRQF_VALID); return 0; +free_edges: + kfree(pctl->eint_dual_edges); chip_error: gpiochip_remove(pctl->chip); pctrl_error: diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h index 740e6d227d0f..375771db9bd0 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.h +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.h @@ -131,6 +131,9 @@ struct mtk_eint_offsets { unsigned int sens; unsigned int sens_set; unsigned int sens_clr; + unsigned int soft; + unsigned int soft_set; + unsigned int soft_clr; unsigned int pol; unsigned int pol_set; unsigned int pol_clr; @@ -217,6 +220,7 @@ struct mtk_pinctrl { const struct mtk_pinctrl_devdata *devdata; void __iomem *eint_reg_base; struct irq_domain *domain; + int *eint_dual_edges; }; int mtk_pctrl_init(struct platform_device *pdev, -- 2.20.1