| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright (c) 2014-2018 MediaTek Inc. |
| |
| /* |
| * Library for MediaTek External Interrupt Support |
| * |
| * Author: Maoguang Meng <maoguang.meng@mediatek.com> |
| * Sean Wang <sean.wang@mediatek.com> |
| * |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/gpio.h> |
| #include <linux/io.h> |
| #include <linux/irqchip/chained_irq.h> |
| #include <linux/irqdomain.h> |
| #include <linux/of_irq.h> |
| #include <linux/platform_device.h> |
| |
| #include "mtk-eint.h" |
| |
| #define MTK_EINT_EDGE_SENSITIVE 0 |
| #define MTK_EINT_LEVEL_SENSITIVE 1 |
| #define MTK_EINT_DBNC_SET_DBNC_BITS 4 |
| #define MTK_EINT_DBNC_RST_BIT (0x1 << 1) |
| #define MTK_EINT_DBNC_SET_EN (0x1 << 0) |
| |
| static const struct mtk_eint_regs mtk_generic_eint_regs = { |
| .stat = 0x000, |
| .ack = 0x040, |
| .mask = 0x080, |
| .mask_set = 0x0c0, |
| .mask_clr = 0x100, |
| .sens = 0x140, |
| .sens_set = 0x180, |
| .sens_clr = 0x1c0, |
| .soft = 0x200, |
| .soft_set = 0x240, |
| .soft_clr = 0x280, |
| .pol = 0x300, |
| .pol_set = 0x340, |
| .pol_clr = 0x380, |
| .dom_en = 0x400, |
| .dbnc_ctrl = 0x500, |
| .dbnc_set = 0x600, |
| .dbnc_clr = 0x700, |
| }; |
| |
| static void __iomem *mtk_eint_get_offset(struct mtk_eint *eint, |
| unsigned int eint_num, |
| unsigned int offset) |
| { |
| unsigned int eint_base = 0; |
| void __iomem *reg; |
| |
| if (eint_num >= eint->hw->ap_num) |
| eint_base = eint->hw->ap_num; |
| |
| reg = eint->base + offset + ((eint_num - eint_base) / 32) * 4; |
| |
| return reg; |
| } |
| |
| static unsigned int mtk_eint_can_en_debounce(struct mtk_eint *eint, |
| unsigned int eint_num) |
| { |
| unsigned int sens; |
| unsigned int bit = BIT(eint_num % 32); |
| void __iomem *reg = mtk_eint_get_offset(eint, eint_num, |
| eint->regs->sens); |
| |
| if (readl(reg) & bit) |
| sens = MTK_EINT_LEVEL_SENSITIVE; |
| else |
| sens = MTK_EINT_EDGE_SENSITIVE; |
| |
| if (eint_num < eint->hw->db_cnt && sens != MTK_EINT_EDGE_SENSITIVE) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static int mtk_eint_flip_edge(struct mtk_eint *eint, int hwirq) |
| { |
| int start_level, curr_level; |
| unsigned int reg_offset; |
| u32 mask = BIT(hwirq & 0x1f); |
| u32 port = (hwirq >> 5) & eint->hw->port_mask; |
| void __iomem *reg = eint->base + (port << 2); |
| |
| curr_level = eint->gpio_xlate->get_gpio_state(eint->pctl, hwirq); |
| |
| do { |
| start_level = curr_level; |
| if (start_level) |
| reg_offset = eint->regs->pol_clr; |
| else |
| reg_offset = eint->regs->pol_set; |
| writel(mask, reg + reg_offset); |
| |
| curr_level = eint->gpio_xlate->get_gpio_state(eint->pctl, |
| hwirq); |
| } while (start_level != curr_level); |
| |
| return start_level; |
| } |
| |
| static void mtk_eint_mask(struct irq_data *d) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| u32 mask = BIT(d->hwirq & 0x1f); |
| void __iomem *reg = mtk_eint_get_offset(eint, d->hwirq, |
| eint->regs->mask_set); |
| |
| eint->cur_mask[d->hwirq >> 5] &= ~mask; |
| |
| writel(mask, reg); |
| } |
| |
| static void mtk_eint_unmask(struct irq_data *d) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| u32 mask = BIT(d->hwirq & 0x1f); |
| void __iomem *reg = mtk_eint_get_offset(eint, d->hwirq, |
| eint->regs->mask_clr); |
| |
| eint->cur_mask[d->hwirq >> 5] |= mask; |
| |
| writel(mask, reg); |
| |
| if (eint->dual_edge[d->hwirq]) |
| mtk_eint_flip_edge(eint, d->hwirq); |
| } |
| |
| static unsigned int mtk_eint_get_mask(struct mtk_eint *eint, |
| unsigned int eint_num) |
| { |
| unsigned int bit = BIT(eint_num % 32); |
| void __iomem *reg = mtk_eint_get_offset(eint, eint_num, |
| eint->regs->mask); |
| |
| return !!(readl(reg) & bit); |
| } |
| |
| static void mtk_eint_ack(struct irq_data *d) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| u32 mask = BIT(d->hwirq & 0x1f); |
| void __iomem *reg = mtk_eint_get_offset(eint, d->hwirq, |
| eint->regs->ack); |
| |
| writel(mask, reg); |
| } |
| |
| static int mtk_eint_set_type(struct irq_data *d, unsigned int type) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| u32 mask = BIT(d->hwirq & 0x1f); |
| void __iomem *reg; |
| |
| if (((type & IRQ_TYPE_EDGE_BOTH) && (type & IRQ_TYPE_LEVEL_MASK)) || |
| ((type & IRQ_TYPE_LEVEL_MASK) == IRQ_TYPE_LEVEL_MASK)) { |
| dev_err(eint->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) |
| eint->dual_edge[d->hwirq] = 1; |
| else |
| eint->dual_edge[d->hwirq] = 0; |
| |
| if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_EDGE_FALLING)) { |
| reg = mtk_eint_get_offset(eint, d->hwirq, eint->regs->pol_clr); |
| writel(mask, reg); |
| } else { |
| reg = mtk_eint_get_offset(eint, d->hwirq, eint->regs->pol_set); |
| writel(mask, reg); |
| } |
| |
| if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) { |
| reg = mtk_eint_get_offset(eint, d->hwirq, eint->regs->sens_clr); |
| writel(mask, reg); |
| } else { |
| reg = mtk_eint_get_offset(eint, d->hwirq, eint->regs->sens_set); |
| writel(mask, reg); |
| } |
| |
| if (eint->dual_edge[d->hwirq]) |
| mtk_eint_flip_edge(eint, d->hwirq); |
| |
| return 0; |
| } |
| |
| static int mtk_eint_irq_set_wake(struct irq_data *d, unsigned int on) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| int shift = d->hwirq & 0x1f; |
| int reg = d->hwirq >> 5; |
| |
| if (on) |
| eint->wake_mask[reg] |= BIT(shift); |
| else |
| eint->wake_mask[reg] &= ~BIT(shift); |
| |
| return 0; |
| } |
| |
| static void mtk_eint_chip_write_mask(const struct mtk_eint *eint, |
| void __iomem *base, u32 *buf) |
| { |
| int port; |
| void __iomem *reg; |
| |
| for (port = 0; port < eint->hw->ports; port++) { |
| reg = base + (port << 2); |
| writel_relaxed(~buf[port], reg + eint->regs->mask_set); |
| writel_relaxed(buf[port], reg + eint->regs->mask_clr); |
| } |
| } |
| |
| static int mtk_eint_irq_request_resources(struct irq_data *d) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| struct gpio_chip *gpio_c; |
| unsigned int gpio_n; |
| int err; |
| |
| err = eint->gpio_xlate->get_gpio_n(eint->pctl, d->hwirq, |
| &gpio_n, &gpio_c); |
| if (err < 0) { |
| dev_err(eint->dev, "Can not find pin\n"); |
| return err; |
| } |
| |
| err = gpiochip_lock_as_irq(gpio_c, gpio_n); |
| if (err < 0) { |
| dev_err(eint->dev, "unable to lock HW IRQ %lu for IRQ\n", |
| irqd_to_hwirq(d)); |
| return err; |
| } |
| |
| err = eint->gpio_xlate->set_gpio_as_eint(eint->pctl, d->hwirq); |
| if (err < 0) { |
| dev_err(eint->dev, "Can not eint mode\n"); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static void mtk_eint_irq_release_resources(struct irq_data *d) |
| { |
| struct mtk_eint *eint = irq_data_get_irq_chip_data(d); |
| struct gpio_chip *gpio_c; |
| unsigned int gpio_n; |
| |
| eint->gpio_xlate->get_gpio_n(eint->pctl, d->hwirq, &gpio_n, |
| &gpio_c); |
| |
| gpiochip_unlock_as_irq(gpio_c, gpio_n); |
| } |
| |
| static struct irq_chip mtk_eint_irq_chip = { |
| .name = "mt-eint", |
| .irq_disable = mtk_eint_mask, |
| .irq_mask = mtk_eint_mask, |
| .irq_unmask = mtk_eint_unmask, |
| .irq_ack = mtk_eint_ack, |
| .irq_set_type = mtk_eint_set_type, |
| .irq_set_wake = mtk_eint_irq_set_wake, |
| .irq_request_resources = mtk_eint_irq_request_resources, |
| .irq_release_resources = mtk_eint_irq_release_resources, |
| }; |
| |
| static unsigned int mtk_eint_hw_init(struct mtk_eint *eint) |
| { |
| void __iomem *dom_en = eint->base + eint->regs->dom_en; |
| void __iomem *mask_set = eint->base + eint->regs->mask_set; |
| unsigned int i; |
| |
| for (i = 0; i < eint->hw->ap_num; i += 32) { |
| writel(0xffffffff, dom_en); |
| writel(0xffffffff, mask_set); |
| dom_en += 4; |
| mask_set += 4; |
| } |
| |
| return 0; |
| } |
| |
| static inline void |
| mtk_eint_debounce_process(struct mtk_eint *eint, int index) |
| { |
| unsigned int rst, ctrl_offset; |
| unsigned int bit, dbnc; |
| |
| ctrl_offset = (index / 4) * 4 + eint->regs->dbnc_ctrl; |
| dbnc = readl(eint->base + ctrl_offset); |
| bit = MTK_EINT_DBNC_SET_EN << ((index % 4) * 8); |
| if ((bit & dbnc) > 0) { |
| ctrl_offset = (index / 4) * 4 + eint->regs->dbnc_set; |
| rst = MTK_EINT_DBNC_RST_BIT << ((index % 4) * 8); |
| writel(rst, eint->base + ctrl_offset); |
| } |
| } |
| |
| static void mtk_eint_irq_handler(struct irq_desc *desc) |
| { |
| struct irq_chip *chip = irq_desc_get_chip(desc); |
| struct mtk_eint *eint = irq_desc_get_handler_data(desc); |
| unsigned int status, eint_num; |
| int offset, mask_offset, index, virq; |
| void __iomem *reg = mtk_eint_get_offset(eint, 0, eint->regs->stat); |
| int dual_edge, start_level, curr_level; |
| |
| chained_irq_enter(chip, desc); |
| for (eint_num = 0; eint_num < eint->hw->ap_num; eint_num += 32, |
| reg += 4) { |
| status = readl(reg); |
| while (status) { |
| offset = __ffs(status); |
| mask_offset = eint_num >> 5; |
| index = eint_num + offset; |
| virq = irq_find_mapping(eint->domain, index); |
| status &= ~BIT(offset); |
| |
| /* |
| * If we get an interrupt on pin that was only required |
| * for wake (but no real interrupt requested), mask the |
| * interrupt (as would mtk_eint_resume do anyway later |
| * in the resume sequence). |
| */ |
| if (eint->wake_mask[mask_offset] & BIT(offset) && |
| !(eint->cur_mask[mask_offset] & BIT(offset))) { |
| writel_relaxed(BIT(offset), reg - |
| eint->regs->stat + |
| eint->regs->mask_set); |
| } |
| |
| dual_edge = eint->dual_edge[index]; |
| if (dual_edge) { |
| /* |
| * Clear soft-irq in case we raised it last |
| * time. |
| */ |
| writel(BIT(offset), reg - eint->regs->stat + |
| eint->regs->soft_clr); |
| |
| start_level = |
| eint->gpio_xlate->get_gpio_state(eint->pctl, |
| index); |
| } |
| |
| generic_handle_irq(virq); |
| |
| if (dual_edge) { |
| curr_level = mtk_eint_flip_edge(eint, 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->regs->stat + |
| eint->regs->soft_set); |
| } |
| |
| if (index < eint->hw->db_cnt) |
| mtk_eint_debounce_process(eint, index); |
| } |
| } |
| chained_irq_exit(chip, desc); |
| } |
| |
| int mtk_eint_do_suspend(struct mtk_eint *eint) |
| { |
| mtk_eint_chip_write_mask(eint, eint->base, eint->wake_mask); |
| |
| return 0; |
| } |
| |
| int mtk_eint_do_resume(struct mtk_eint *eint) |
| { |
| mtk_eint_chip_write_mask(eint, eint->base, eint->cur_mask); |
| |
| return 0; |
| } |
| |
| int mtk_eint_set_debounce(struct mtk_eint *eint, unsigned long eint_num, |
| unsigned int debounce) |
| { |
| int virq, eint_offset; |
| unsigned int set_offset, bit, clr_bit, clr_offset, rst, i, unmask, |
| dbnc; |
| static const unsigned int debounce_time[] = {500, 1000, 16000, 32000, |
| 64000, 128000, 256000}; |
| struct irq_data *d; |
| |
| virq = irq_find_mapping(eint->domain, eint_num); |
| eint_offset = (eint_num % 4) * 8; |
| d = irq_get_irq_data(virq); |
| |
| set_offset = (eint_num / 4) * 4 + eint->regs->dbnc_set; |
| clr_offset = (eint_num / 4) * 4 + eint->regs->dbnc_clr; |
| |
| if (!mtk_eint_can_en_debounce(eint, eint_num)) |
| return -EINVAL; |
| |
| dbnc = ARRAY_SIZE(debounce_time); |
| for (i = 0; i < ARRAY_SIZE(debounce_time); i++) { |
| if (debounce <= debounce_time[i]) { |
| dbnc = i; |
| break; |
| } |
| } |
| |
| if (!mtk_eint_get_mask(eint, eint_num)) { |
| mtk_eint_mask(d); |
| unmask = 1; |
| } else { |
| unmask = 0; |
| } |
| |
| clr_bit = 0xff << eint_offset; |
| writel(clr_bit, eint->base + clr_offset); |
| |
| bit = ((dbnc << MTK_EINT_DBNC_SET_DBNC_BITS) | MTK_EINT_DBNC_SET_EN) << |
| eint_offset; |
| rst = MTK_EINT_DBNC_RST_BIT << eint_offset; |
| writel(rst | bit, eint->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; |
| } |
| |
| int mtk_eint_find_irq(struct mtk_eint *eint, unsigned long eint_n) |
| { |
| int irq; |
| |
| irq = irq_find_mapping(eint->domain, eint_n); |
| if (!irq) |
| return -EINVAL; |
| |
| return irq; |
| } |
| |
| int mtk_eint_do_init(struct mtk_eint *eint) |
| { |
| int i; |
| |
| /* If clients don't assign a specific regs, let's use generic one */ |
| if (!eint->regs) |
| eint->regs = &mtk_generic_eint_regs; |
| |
| eint->wake_mask = devm_kcalloc(eint->dev, eint->hw->ports, |
| sizeof(*eint->wake_mask), GFP_KERNEL); |
| if (!eint->wake_mask) |
| return -ENOMEM; |
| |
| eint->cur_mask = devm_kcalloc(eint->dev, eint->hw->ports, |
| sizeof(*eint->cur_mask), GFP_KERNEL); |
| if (!eint->cur_mask) |
| return -ENOMEM; |
| |
| eint->dual_edge = devm_kcalloc(eint->dev, eint->hw->ap_num, |
| sizeof(int), GFP_KERNEL); |
| if (!eint->dual_edge) |
| return -ENOMEM; |
| |
| eint->domain = irq_domain_add_linear(eint->dev->of_node, |
| eint->hw->ap_num, |
| &irq_domain_simple_ops, NULL); |
| if (!eint->domain) |
| return -ENOMEM; |
| |
| mtk_eint_hw_init(eint); |
| for (i = 0; i < eint->hw->ap_num; i++) { |
| int virq = irq_create_mapping(eint->domain, i); |
| |
| irq_set_chip_and_handler(virq, &mtk_eint_irq_chip, |
| handle_level_irq); |
| irq_set_chip_data(virq, eint); |
| } |
| |
| irq_set_chained_handler_and_data(eint->irq, mtk_eint_irq_handler, |
| eint); |
| |
| return 0; |
| } |