/* * linux/arch/arm/mach-omap2/irq.c * * Interrupt handler for OMAP2 boards. * * Copyright (C) 2005 Nokia Corporation * Author: Paul Mundt <paul.mundt@nokia.com> * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <asm/exception.h> #include <linux/irqchip.h> #include <linux/irqdomain.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/irqchip/irq-omap-intc.h> /* selected INTC register offsets */ #define INTC_REVISION 0x0000 #define INTC_SYSCONFIG 0x0010 #define INTC_SYSSTATUS 0x0014 #define INTC_SIR 0x0040 #define INTC_CONTROL 0x0048 #define INTC_PROTECTION 0x004C #define INTC_IDLE 0x0050 #define INTC_THRESHOLD 0x0068 #define INTC_MIR0 0x0084 #define INTC_MIR_CLEAR0 0x0088 #define INTC_MIR_SET0 0x008c #define INTC_PENDING_IRQ0 0x0098 #define INTC_PENDING_IRQ1 0x00b8 #define INTC_PENDING_IRQ2 0x00d8 #define INTC_PENDING_IRQ3 0x00f8 #define INTC_ILR0 0x0100 #define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */ #define SPURIOUSIRQ_MASK (0x1ffffff << 7) #define INTCPS_NR_ILR_REGS 128 #define INTCPS_NR_MIR_REGS 4 #define INTC_IDLE_FUNCIDLE (1 << 0) #define INTC_IDLE_TURBO (1 << 1) #define INTC_PROTECTION_ENABLE (1 << 0) struct omap_intc_regs { u32 sysconfig; u32 protection; u32 idle; u32 threshold; u32 ilr[INTCPS_NR_ILR_REGS]; u32 mir[INTCPS_NR_MIR_REGS]; }; static struct omap_intc_regs intc_context; static struct irq_domain *domain; static void __iomem *omap_irq_base; static int omap_nr_pending; static int omap_nr_irqs; static void intc_writel(u32 reg, u32 val) { writel_relaxed(val, omap_irq_base + reg); } static u32 intc_readl(u32 reg) { return readl_relaxed(omap_irq_base + reg); } void omap_intc_save_context(void) { int i; intc_context.sysconfig = intc_readl(INTC_SYSCONFIG); intc_context.protection = intc_readl(INTC_PROTECTION); intc_context.idle = intc_readl(INTC_IDLE); intc_context.threshold = intc_readl(INTC_THRESHOLD); for (i = 0; i < omap_nr_irqs; i++) intc_context.ilr[i] = intc_readl((INTC_ILR0 + 0x4 * i)); for (i = 0; i < INTCPS_NR_MIR_REGS; i++) intc_context.mir[i] = intc_readl(INTC_MIR0 + (0x20 * i)); } void omap_intc_restore_context(void) { int i; intc_writel(INTC_SYSCONFIG, intc_context.sysconfig); intc_writel(INTC_PROTECTION, intc_context.protection); intc_writel(INTC_IDLE, intc_context.idle); intc_writel(INTC_THRESHOLD, intc_context.threshold); for (i = 0; i < omap_nr_irqs; i++) intc_writel(INTC_ILR0 + 0x4 * i, intc_context.ilr[i]); for (i = 0; i < INTCPS_NR_MIR_REGS; i++) intc_writel(INTC_MIR0 + 0x20 * i, intc_context.mir[i]); /* MIRs are saved and restore with other PRCM registers */ } void omap3_intc_prepare_idle(void) { /* * Disable autoidle as it can stall interrupt controller, * cf. errata ID i540 for 3430 (all revisions up to 3.1.x) */ intc_writel(INTC_SYSCONFIG, 0); intc_writel(INTC_IDLE, INTC_IDLE_TURBO); } void omap3_intc_resume_idle(void) { /* Re-enable autoidle */ intc_writel(INTC_SYSCONFIG, 1); intc_writel(INTC_IDLE, 0); } /* XXX: FIQ and additional INTC support (only MPU at the moment) */ static void omap_ack_irq(struct irq_data *d) { intc_writel(INTC_CONTROL, 0x1); } static void omap_mask_ack_irq(struct irq_data *d) { irq_gc_mask_disable_reg(d); omap_ack_irq(d); } static void __init omap_irq_soft_reset(void) { unsigned long tmp; tmp = intc_readl(INTC_REVISION) & 0xff; pr_info("IRQ: Found an INTC at 0x%p (revision %ld.%ld) with %d interrupts\n", omap_irq_base, tmp >> 4, tmp & 0xf, omap_nr_irqs); tmp = intc_readl(INTC_SYSCONFIG); tmp |= 1 << 1; /* soft reset */ intc_writel(INTC_SYSCONFIG, tmp); while (!(intc_readl(INTC_SYSSTATUS) & 0x1)) /* Wait for reset to complete */; /* Enable autoidle */ intc_writel(INTC_SYSCONFIG, 1 << 0); } int omap_irq_pending(void) { int i; for (i = 0; i < omap_nr_pending; i++) if (intc_readl(INTC_PENDING_IRQ0 + (0x20 * i))) return 1; return 0; } void omap3_intc_suspend(void) { /* A pending interrupt would prevent OMAP from entering suspend */ omap_ack_irq(NULL); } static int __init omap_alloc_gc_of(struct irq_domain *d, void __iomem *base) { int ret; int i; ret = irq_alloc_domain_generic_chips(d, 32, 1, "INTC", handle_level_irq, IRQ_NOREQUEST | IRQ_NOPROBE, IRQ_LEVEL, 0); if (ret) { pr_warn("Failed to allocate irq chips\n"); return ret; } for (i = 0; i < omap_nr_pending; i++) { struct irq_chip_generic *gc; struct irq_chip_type *ct; gc = irq_get_domain_generic_chip(d, 32 * i); gc->reg_base = base; ct = gc->chip_types; ct->type = IRQ_TYPE_LEVEL_MASK; ct->chip.irq_ack = omap_mask_ack_irq; ct->chip.irq_mask = irq_gc_mask_disable_reg; ct->chip.irq_unmask = irq_gc_unmask_enable_reg; ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE; ct->regs.enable = INTC_MIR_CLEAR0 + 32 * i; ct->regs.disable = INTC_MIR_SET0 + 32 * i; } return 0; } static void __init omap_alloc_gc_legacy(void __iomem *base, unsigned int irq_start, unsigned int num) { struct irq_chip_generic *gc; struct irq_chip_type *ct; gc = irq_alloc_generic_chip("INTC", 1, irq_start, base, handle_level_irq); ct = gc->chip_types; ct->chip.irq_ack = omap_mask_ack_irq; ct->chip.irq_mask = irq_gc_mask_disable_reg; ct->chip.irq_unmask = irq_gc_unmask_enable_reg; ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE; ct->regs.enable = INTC_MIR_CLEAR0; ct->regs.disable = INTC_MIR_SET0; irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST | IRQ_NOPROBE, 0); } static int __init omap_init_irq_of(struct device_node *node) { int ret; omap_irq_base = of_iomap(node, 0); if (WARN_ON(!omap_irq_base)) return -ENOMEM; domain = irq_domain_add_linear(node, omap_nr_irqs, &irq_generic_chip_ops, NULL); omap_irq_soft_reset(); ret = omap_alloc_gc_of(domain, omap_irq_base); if (ret < 0) irq_domain_remove(domain); return ret; } static int __init omap_init_irq_legacy(u32 base, struct device_node *node) { int j, irq_base; omap_irq_base = ioremap(base, SZ_4K); if (WARN_ON(!omap_irq_base)) return -ENOMEM; irq_base = irq_alloc_descs(-1, 0, omap_nr_irqs, 0); if (irq_base < 0) { pr_warn("Couldn't allocate IRQ numbers\n"); irq_base = 0; } domain = irq_domain_add_legacy(node, omap_nr_irqs, irq_base, 0, &irq_domain_simple_ops, NULL); omap_irq_soft_reset(); for (j = 0; j < omap_nr_irqs; j += 32) omap_alloc_gc_legacy(omap_irq_base + j, j + irq_base, 32); return 0; } static void __init omap_irq_enable_protection(void) { u32 reg; reg = intc_readl(INTC_PROTECTION); reg |= INTC_PROTECTION_ENABLE; intc_writel(INTC_PROTECTION, reg); } static int __init omap_init_irq(u32 base, struct device_node *node) { int ret; /* * FIXME legacy OMAP DMA driver sitting under arch/arm/plat-omap/dma.c * depends is still not ready for linear IRQ domains; because of that * we need to temporarily "blacklist" OMAP2 and OMAP3 devices from using * linear IRQ Domain until that driver is finally fixed. */ if (of_device_is_compatible(node, "ti,omap2-intc") || of_device_is_compatible(node, "ti,omap3-intc")) { struct resource res; if (of_address_to_resource(node, 0, &res)) return -ENOMEM; base = res.start; ret = omap_init_irq_legacy(base, node); } else if (node) { ret = omap_init_irq_of(node); } else { ret = omap_init_irq_legacy(base, NULL); } if (ret == 0) omap_irq_enable_protection(); return ret; } static asmlinkage void __exception_irq_entry omap_intc_handle_irq(struct pt_regs *regs) { extern unsigned long irq_err_count; u32 irqnr; irqnr = intc_readl(INTC_SIR); /* * A spurious IRQ can result if interrupt that triggered the * sorting is no longer active during the sorting (10 INTC * functional clock cycles after interrupt assertion). Or a * change in interrupt mask affected the result during sorting * time. There is no special handling required except ignoring * the SIR register value just read and retrying. * See section 6.2.5 of AM335x TRM Literature Number: SPRUH73K * * Many a times, a spurious interrupt situation has been fixed * by adding a flush for the posted write acking the IRQ in * the device driver. Typically, this is going be the device * driver whose interrupt was handled just before the spurious * IRQ occurred. Pay attention to those device drivers if you * run into hitting the spurious IRQ condition below. */ if (unlikely((irqnr & SPURIOUSIRQ_MASK) == SPURIOUSIRQ_MASK)) { pr_err_once("%s: spurious irq!\n", __func__); irq_err_count++; omap_ack_irq(NULL); return; } irqnr &= ACTIVEIRQ_MASK; handle_domain_irq(domain, irqnr, regs); } static int __init intc_of_init(struct device_node *node, struct device_node *parent) { int ret; omap_nr_pending = 3; omap_nr_irqs = 96; if (WARN_ON(!node)) return -ENODEV; if (of_device_is_compatible(node, "ti,dm814-intc") || of_device_is_compatible(node, "ti,dm816-intc") || of_device_is_compatible(node, "ti,am33xx-intc")) { omap_nr_irqs = 128; omap_nr_pending = 4; } ret = omap_init_irq(-1, of_node_get(node)); if (ret < 0) return ret; set_handle_irq(omap_intc_handle_irq); return 0; } IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init); IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init); IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init); IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init); IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init);