From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/arm/mach-pxa/irq.c | 274 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 274 insertions(+) create mode 100644 kernel/arch/arm/mach-pxa/irq.c (limited to 'kernel/arch/arm/mach-pxa/irq.c') diff --git a/kernel/arch/arm/mach-pxa/irq.c b/kernel/arch/arm/mach-pxa/irq.c new file mode 100644 index 000000000..89a7c0657 --- /dev/null +++ b/kernel/arch/arm/mach-pxa/irq.c @@ -0,0 +1,274 @@ +/* + * linux/arch/arm/mach-pxa/irq.c + * + * Generic PXA IRQ handling + * + * Author: Nicolas Pitre + * Created: Jun 15, 2001 + * Copyright: MontaVista Software Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include + +#include "generic.h" + +#define ICIP (0x000) +#define ICMR (0x004) +#define ICLR (0x008) +#define ICFR (0x00c) +#define ICPR (0x010) +#define ICCR (0x014) +#define ICHP (0x018) +#define IPR(i) (((i) < 32) ? (0x01c + ((i) << 2)) : \ + ((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) : \ + (0x144 + (((i) - 64) << 2))) +#define ICHP_VAL_IRQ (1 << 31) +#define ICHP_IRQ(i) (((i) >> 16) & 0x7fff) +#define IPR_VALID (1 << 31) + +#define MAX_INTERNAL_IRQS 128 + +/* + * This is for peripheral IRQs internal to the PXA chip. + */ + +static void __iomem *pxa_irq_base; +static int pxa_internal_irq_nr; +static bool cpu_has_ipr; +static struct irq_domain *pxa_irq_domain; + +static inline void __iomem *irq_base(int i) +{ + static unsigned long phys_base_offset[] = { + 0x0, + 0x9c, + 0x130, + }; + + return pxa_irq_base + phys_base_offset[i]; +} + +void pxa_mask_irq(struct irq_data *d) +{ + void __iomem *base = irq_data_get_irq_chip_data(d); + irq_hw_number_t irq = irqd_to_hwirq(d); + uint32_t icmr = __raw_readl(base + ICMR); + + icmr &= ~BIT(irq & 0x1f); + __raw_writel(icmr, base + ICMR); +} + +void pxa_unmask_irq(struct irq_data *d) +{ + void __iomem *base = irq_data_get_irq_chip_data(d); + irq_hw_number_t irq = irqd_to_hwirq(d); + uint32_t icmr = __raw_readl(base + ICMR); + + icmr |= BIT(irq & 0x1f); + __raw_writel(icmr, base + ICMR); +} + +static struct irq_chip pxa_internal_irq_chip = { + .name = "SC", + .irq_ack = pxa_mask_irq, + .irq_mask = pxa_mask_irq, + .irq_unmask = pxa_unmask_irq, +}; + +asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs) +{ + uint32_t icip, icmr, mask; + + do { + icip = __raw_readl(pxa_irq_base + ICIP); + icmr = __raw_readl(pxa_irq_base + ICMR); + mask = icip & icmr; + + if (mask == 0) + break; + + handle_IRQ(PXA_IRQ(fls(mask) - 1), regs); + } while (1); +} + +asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs) +{ + uint32_t ichp; + + do { + __asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp)); + + if ((ichp & ICHP_VAL_IRQ) == 0) + break; + + handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs); + } while (1); +} + +static int pxa_irq_map(struct irq_domain *h, unsigned int virq, + irq_hw_number_t hw) +{ + void __iomem *base = irq_base(hw / 32); + + /* initialize interrupt priority */ + if (cpu_has_ipr) + __raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw)); + + irq_set_chip_and_handler(virq, &pxa_internal_irq_chip, + handle_level_irq); + irq_set_chip_data(virq, base); + set_irq_flags(virq, IRQF_VALID); + + return 0; +} + +static struct irq_domain_ops pxa_irq_ops = { + .map = pxa_irq_map, + .xlate = irq_domain_xlate_onecell, +}; + +static __init void +pxa_init_irq_common(struct device_node *node, int irq_nr, + int (*fn)(struct irq_data *, unsigned int)) +{ + int n; + + pxa_internal_irq_nr = irq_nr; + pxa_irq_domain = irq_domain_add_legacy(node, irq_nr, + PXA_IRQ(0), 0, + &pxa_irq_ops, NULL); + if (!pxa_irq_domain) + panic("Unable to add PXA IRQ domain\n"); + irq_set_default_host(pxa_irq_domain); + + for (n = 0; n < irq_nr; n += 32) { + void __iomem *base = irq_base(n >> 5); + + __raw_writel(0, base + ICMR); /* disable all IRQs */ + __raw_writel(0, base + ICLR); /* all IRQs are IRQ, not FIQ */ + } + /* only unmasked interrupts kick us out of idle */ + __raw_writel(1, irq_base(0) + ICCR); + + pxa_internal_irq_chip.irq_set_wake = fn; +} + +void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int)) +{ + BUG_ON(irq_nr > MAX_INTERNAL_IRQS); + + pxa_irq_base = io_p2v(0x40d00000); + cpu_has_ipr = !cpu_is_pxa25x(); + pxa_init_irq_common(NULL, irq_nr, fn); +} + +#ifdef CONFIG_PM +static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32]; +static unsigned long saved_ipr[MAX_INTERNAL_IRQS]; + +static int pxa_irq_suspend(void) +{ + int i; + + for (i = 0; i < pxa_internal_irq_nr / 32; i++) { + void __iomem *base = irq_base(i); + + saved_icmr[i] = __raw_readl(base + ICMR); + __raw_writel(0, base + ICMR); + } + + if (cpu_has_ipr) { + for (i = 0; i < pxa_internal_irq_nr; i++) + saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i)); + } + + return 0; +} + +static void pxa_irq_resume(void) +{ + int i; + + for (i = 0; i < pxa_internal_irq_nr / 32; i++) { + void __iomem *base = irq_base(i); + + __raw_writel(saved_icmr[i], base + ICMR); + __raw_writel(0, base + ICLR); + } + + if (cpu_has_ipr) + for (i = 0; i < pxa_internal_irq_nr; i++) + __raw_writel(saved_ipr[i], pxa_irq_base + IPR(i)); + + __raw_writel(1, pxa_irq_base + ICCR); +} +#else +#define pxa_irq_suspend NULL +#define pxa_irq_resume NULL +#endif + +struct syscore_ops pxa_irq_syscore_ops = { + .suspend = pxa_irq_suspend, + .resume = pxa_irq_resume, +}; + +#ifdef CONFIG_OF +static const struct of_device_id intc_ids[] __initconst = { + { .compatible = "marvell,pxa-intc", }, + {} +}; + +void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int)) +{ + struct device_node *node; + struct resource res; + int ret; + + node = of_find_matching_node(NULL, intc_ids); + if (!node) { + pr_err("Failed to find interrupt controller in arch-pxa\n"); + return; + } + + ret = of_property_read_u32(node, "marvell,intc-nr-irqs", + &pxa_internal_irq_nr); + if (ret) { + pr_err("Not found marvell,intc-nr-irqs property\n"); + return; + } + + ret = of_address_to_resource(node, 0, &res); + if (ret < 0) { + pr_err("No registers defined for node\n"); + return; + } + pxa_irq_base = io_p2v(res.start); + + if (of_find_property(node, "marvell,intc-priority", NULL)) + cpu_has_ipr = 1; + + ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0); + if (ret < 0) { + pr_err("Failed to allocate IRQ numbers\n"); + return; + } + + pxa_init_irq_common(node, pxa_internal_irq_nr, fn); +} +#endif /* CONFIG_OF */ -- cgit 1.2.3-korg