// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/kernel.h> #include <linux/init.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/module.h> #include <linux/irqdomain.h> #include <linux/irqchip.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/io.h> #include <asm/irq.h> #define INTC_IRQS 64 #define CK_INTC_ICR 0x00 #define CK_INTC_PEN31_00 0x14 #define CK_INTC_PEN63_32 0x2c #define CK_INTC_NEN31_00 0x10 #define CK_INTC_NEN63_32 0x28 #define CK_INTC_SOURCE 0x40 #define CK_INTC_DUAL_BASE 0x100 #define GX_INTC_PEN31_00 0x00 #define GX_INTC_PEN63_32 0x04 #define GX_INTC_NEN31_00 0x40 #define GX_INTC_NEN63_32 0x44 #define GX_INTC_NMASK31_00 0x50 #define GX_INTC_NMASK63_32 0x54 #define GX_INTC_SOURCE 0x60 static void __iomem *reg_base; static struct irq_domain *root_domain; static int nr_irq = INTC_IRQS; /* * When controller support pulse signal, the PEN_reg will hold on signal * without software trigger. * * So, to support pulse signal we need to clear IFR_reg and the address of * IFR_offset is NEN_offset - 8. */ static void irq_ck_mask_set_bit(struct irq_data *d) { struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); struct irq_chip_type *ct = irq_data_get_chip_type(d); unsigned long ifr = ct->regs.mask - 8; u32 mask = d->mask; irq_gc_lock(gc); *ct->mask_cache |= mask; irq_reg_writel(gc, *ct->mask_cache, ct->regs.mask); irq_reg_writel(gc, irq_reg_readl(gc, ifr) & ~mask, ifr); irq_gc_unlock(gc); } static void __init ck_set_gc(struct device_node *node, void __iomem *reg_base, u32 mask_reg, u32 irq_base) { struct irq_chip_generic *gc; gc = irq_get_domain_generic_chip(root_domain, irq_base); gc->reg_base = reg_base; gc->chip_types[0].regs.mask = mask_reg; gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; if (of_find_property(node, "csky,support-pulse-signal", NULL)) gc->chip_types[0].chip.irq_unmask = irq_ck_mask_set_bit; } static inline u32 build_channel_val(u32 idx, u32 magic) { u32 res; /* * Set the same index for each channel */ res = idx | (idx << 8) | (idx << 16) | (idx << 24); /* * Set the channel magic number in descending order. * The magic is 0x00010203 for ck-intc * The magic is 0x03020100 for gx6605s-intc */ return res | magic; } static inline void setup_irq_channel(u32 magic, void __iomem *reg_addr) { u32 i; /* Setup 64 channel slots */ for (i = 0; i < INTC_IRQS; i += 4) writel_relaxed(build_channel_val(i, magic), reg_addr + i); } static int __init ck_intc_init_comm(struct device_node *node, struct device_node *parent) { int ret; if (parent) { pr_err("C-SKY Intc not a root irq controller\n"); return -EINVAL; } reg_base = of_iomap(node, 0); if (!reg_base) { pr_err("C-SKY Intc unable to map: %p.\n", node); return -EINVAL; } root_domain = irq_domain_add_linear(node, nr_irq, &irq_generic_chip_ops, NULL); if (!root_domain) { pr_err("C-SKY Intc irq_domain_add failed.\n"); return -ENOMEM; } ret = irq_alloc_domain_generic_chips(root_domain, 32, 1, "csky_intc", handle_level_irq, IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN, 0, 0); if (ret) { pr_err("C-SKY Intc irq_alloc_gc failed.\n"); return -ENOMEM; } return 0; } static inline bool handle_irq_perbit(struct pt_regs *regs, u32 hwirq, u32 irq_base) { u32 irq; if (hwirq == 0) return 0; while (hwirq) { irq = __ffs(hwirq); hwirq &= ~BIT(irq); handle_domain_irq(root_domain, irq_base + irq, regs); } return 1; } /* gx6605s 64 irqs interrupt controller */ static void gx_irq_handler(struct pt_regs *regs) { bool ret; do { ret = handle_irq_perbit(regs, readl_relaxed(reg_base + GX_INTC_PEN31_00), 0); ret |= handle_irq_perbit(regs, readl_relaxed(reg_base + GX_INTC_PEN63_32), 32); } while (ret); } static int __init gx_intc_init(struct device_node *node, struct device_node *parent) { int ret; ret = ck_intc_init_comm(node, parent); if (ret) return ret; /* * Initial enable reg to disable all interrupts */ writel_relaxed(0x0, reg_base + GX_INTC_NEN31_00); writel_relaxed(0x0, reg_base + GX_INTC_NEN63_32); /* * Initial mask reg with all unmasked, because we only use enalbe reg */ writel_relaxed(0x0, reg_base + GX_INTC_NMASK31_00); writel_relaxed(0x0, reg_base + GX_INTC_NMASK63_32); setup_irq_channel(0x03020100, reg_base + GX_INTC_SOURCE); ck_set_gc(node, reg_base, GX_INTC_NEN31_00, 0); ck_set_gc(node, reg_base, GX_INTC_NEN63_32, 32); set_handle_irq(gx_irq_handler); return 0; } IRQCHIP_DECLARE(csky_gx6605s_intc, "csky,gx6605s-intc", gx_intc_init); /* * C-SKY simple 64 irqs interrupt controller, dual-together could support 128 * irqs. */ static void ck_irq_handler(struct pt_regs *regs) { bool ret; void __iomem *reg_pen_lo = reg_base + CK_INTC_PEN31_00; void __iomem *reg_pen_hi = reg_base + CK_INTC_PEN63_32; do { /* handle 0 - 31 irqs */ ret = handle_irq_perbit(regs, readl_relaxed(reg_pen_lo), 0); ret |= handle_irq_perbit(regs, readl_relaxed(reg_pen_hi), 32); if (nr_irq == INTC_IRQS) continue; /* handle 64 - 127 irqs */ ret |= handle_irq_perbit(regs, readl_relaxed(reg_pen_lo + CK_INTC_DUAL_BASE), 64); ret |= handle_irq_perbit(regs, readl_relaxed(reg_pen_hi + CK_INTC_DUAL_BASE), 96); } while (ret); } static int __init ck_intc_init(struct device_node *node, struct device_node *parent) { int ret; ret = ck_intc_init_comm(node, parent); if (ret) return ret; /* Initial enable reg to disable all interrupts */ writel_relaxed(0, reg_base + CK_INTC_NEN31_00); writel_relaxed(0, reg_base + CK_INTC_NEN63_32); /* Enable irq intc */ writel_relaxed(BIT(31), reg_base + CK_INTC_ICR); ck_set_gc(node, reg_base, CK_INTC_NEN31_00, 0); ck_set_gc(node, reg_base, CK_INTC_NEN63_32, 32); setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE); set_handle_irq(ck_irq_handler); return 0; } IRQCHIP_DECLARE(ck_intc, "csky,apb-intc", ck_intc_init); static int __init ck_dual_intc_init(struct device_node *node, struct device_node *parent) { int ret; /* dual-apb-intc up to 128 irq sources*/ nr_irq = INTC_IRQS * 2; ret = ck_intc_init(node, parent); if (ret) return ret; /* Initial enable reg to disable all interrupts */ writel_relaxed(0, reg_base + CK_INTC_NEN31_00 + CK_INTC_DUAL_BASE); writel_relaxed(0, reg_base + CK_INTC_NEN63_32 + CK_INTC_DUAL_BASE); ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN31_00, 64); ck_set_gc(node, reg_base + CK_INTC_DUAL_BASE, CK_INTC_NEN63_32, 96); setup_irq_channel(0x00010203, reg_base + CK_INTC_SOURCE + CK_INTC_DUAL_BASE); return 0; } IRQCHIP_DECLARE(ck_dual_intc, "csky,dual-apb-intc", ck_dual_intc_init);