From: Marc Zyngier <marc.zyngier@xxxxxxx> A few GICv2 low-level function are actually very useful to GICv3, and it makes some sense to share them across the two drivers. They end-up in their own file, with an additional parameter used to ensure an optional synchronization (unused on GICv2). Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx> Acked-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> Link: https://lkml.kernel.org/r/1404140510-5382-2-git-send-email-marc.zyngier@xxxxxxx Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx> --- drivers/irqchip/Makefile | 2 +- drivers/irqchip/irq-gic-common.c | 115 +++++++++++++++++++++++++++++++++++++++ drivers/irqchip/irq-gic-common.h | 29 ++++++++++ drivers/irqchip/irq-gic.c | 59 ++------------------ 4 files changed, 149 insertions(+), 56 deletions(-) create mode 100644 drivers/irqchip/irq-gic-common.c create mode 100644 drivers/irqchip/irq-gic-common.h diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 62a13e5..9b9505c 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -15,7 +15,7 @@ obj-$(CONFIG_ORION_IRQCHIP) += irq-orion.o obj-$(CONFIG_ARCH_SUNXI) += irq-sun4i.o obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi-nmi.o obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o -obj-$(CONFIG_ARM_GIC) += irq-gic.o +obj-$(CONFIG_ARM_GIC) += irq-gic.o irq-gic-common.o obj-$(CONFIG_ARM_NVIC) += irq-nvic.o obj-$(CONFIG_ARM_VIC) += irq-vic.o obj-$(CONFIG_IMGPDC_IRQ) += irq-imgpdc.o diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c new file mode 100644 index 0000000..60ac704 --- /dev/null +++ b/drivers/irqchip/irq-gic-common.c @@ -0,0 +1,115 @@ +/* + * Copyright (C) 2002 ARM Limited, All Rights Reserved. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/irqchip/arm-gic.h> + +#include "irq-gic-common.h" + +void gic_configure_irq(unsigned int irq, unsigned int type, + void __iomem *base, void (*sync_access)(void)) +{ + u32 enablemask = 1 << (irq % 32); + u32 enableoff = (irq / 32) * 4; + u32 confmask = 0x2 << ((irq % 16) * 2); + u32 confoff = (irq / 16) * 4; + bool enabled = false; + u32 val; + + /* + * Read current configuration register, and insert the config + * for "irq", depending on "type". + */ + val = readl_relaxed(base + GIC_DIST_CONFIG + confoff); + if (type == IRQ_TYPE_LEVEL_HIGH) + val &= ~confmask; + else if (type == IRQ_TYPE_EDGE_RISING) + val |= confmask; + + /* + * As recommended by the spec, disable the interrupt before changing + * the configuration + */ + if (readl_relaxed(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) { + writel_relaxed(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff); + if (sync_access) + sync_access(); + enabled = true; + } + + /* + * Write back the new configuration, and possibly re-enable + * the interrupt. + */ + writel_relaxed(val, base + GIC_DIST_CONFIG + confoff); + + if (enabled) + writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff); + + if (sync_access) + sync_access(); +} + +void __init gic_dist_config(void __iomem *base, int gic_irqs, + void (*sync_access)(void)) +{ + unsigned int i; + + /* + * Set all global interrupts to be level triggered, active low. + */ + for (i = 32; i < gic_irqs; i += 16) + writel_relaxed(0, base + GIC_DIST_CONFIG + i / 4); + + /* + * Set priority on all global interrupts. + */ + for (i = 32; i < gic_irqs; i += 4) + writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i); + + /* + * Disable all interrupts. Leave the PPI and SGIs alone + * as they are enabled by redistributor registers. + */ + for (i = 32; i < gic_irqs; i += 32) + writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i / 8); + + if (sync_access) + sync_access(); +} + +void gic_cpu_config(void __iomem *base, void (*sync_access)(void)) +{ + int i; + + /* + * Deal with the banked PPI and SGI interrupts - disable all + * PPI interrupts, ensure all SGI interrupts are enabled. + */ + writel_relaxed(0xffff0000, base + GIC_DIST_ENABLE_CLEAR); + writel_relaxed(0x0000ffff, base + GIC_DIST_ENABLE_SET); + + /* + * Set priority on PPI and SGI interrupts + */ + for (i = 0; i < 32; i += 4) + writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4); + + if (sync_access) + sync_access(); +} diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h new file mode 100644 index 0000000..b41f024 --- /dev/null +++ b/drivers/irqchip/irq-gic-common.h @@ -0,0 +1,29 @@ +/* + * Copyright (C) 2002 ARM Limited, All Rights Reserved. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _IRQ_GIC_COMMON_H +#define _IRQ_GIC_COMMON_H + +#include <linux/of.h> +#include <linux/irqdomain.h> + +void gic_configure_irq(unsigned int irq, unsigned int type, + void __iomem *base, void (*sync_access)(void)); +void gic_dist_config(void __iomem *base, int gic_irqs, + void (*sync_access)(void)); +void gic_cpu_config(void __iomem *base, void (*sync_access)(void)); + +#endif /* _IRQ_GIC_COMMON_H */ diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index 7e11c9d..508b815 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -46,6 +46,7 @@ #include <asm/exception.h> #include <asm/smp_plat.h> +#include "irq-gic-common.h" #include "irqchip.h" union gic_base { @@ -188,12 +189,6 @@ static int gic_set_type(struct irq_data *d, unsigned int type) { void __iomem *base = gic_dist_base(d); unsigned int gicirq = gic_irq(d); - u32 enablemask = 1 << (gicirq % 32); - u32 enableoff = (gicirq / 32) * 4; - u32 confmask = 0x2 << ((gicirq % 16) * 2); - u32 confoff = (gicirq / 16) * 4; - bool enabled = false; - u32 val; /* Interrupt configuration for SGIs can't be changed */ if (gicirq < 16) @@ -207,25 +202,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type) if (gic_arch_extn.irq_set_type) gic_arch_extn.irq_set_type(d, type); - val = readl_relaxed(base + GIC_DIST_CONFIG + confoff); - if (type == IRQ_TYPE_LEVEL_HIGH) - val &= ~confmask; - else if (type == IRQ_TYPE_EDGE_RISING) - val |= confmask; - - /* - * As recommended by the spec, disable the interrupt before changing - * the configuration - */ - if (readl_relaxed(base + GIC_DIST_ENABLE_SET + enableoff) & enablemask) { - writel_relaxed(enablemask, base + GIC_DIST_ENABLE_CLEAR + enableoff); - enabled = true; - } - - writel_relaxed(val, base + GIC_DIST_CONFIG + confoff); - - if (enabled) - writel_relaxed(enablemask, base + GIC_DIST_ENABLE_SET + enableoff); + gic_configure_irq(gicirq, type, base, NULL); raw_spin_unlock(&irq_controller_lock); @@ -387,12 +364,6 @@ static void __init gic_dist_init(struct gic_chip_data *gic) writel_relaxed(0, base + GIC_DIST_CTRL); /* - * Set all global interrupts to be level triggered, active low. - */ - for (i = 32; i < gic_irqs; i += 16) - writel_relaxed(0, base + GIC_DIST_CONFIG + i * 4 / 16); - - /* * Set all global interrupts to this CPU only. */ cpumask = gic_get_cpumask(gic); @@ -401,18 +372,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic) for (i = 32; i < gic_irqs; i += 4) writel_relaxed(cpumask, base + GIC_DIST_TARGET + i * 4 / 4); - /* - * Set priority on all global interrupts. - */ - for (i = 32; i < gic_irqs; i += 4) - writel_relaxed(0xa0a0a0a0, base + GIC_DIST_PRI + i * 4 / 4); - - /* - * Disable all interrupts. Leave the PPI and SGIs alone - * as these enables are banked registers. - */ - for (i = 32; i < gic_irqs; i += 32) - writel_relaxed(0xffffffff, base + GIC_DIST_ENABLE_CLEAR + i * 4 / 32); + gic_dist_config(base, gic_irqs, NULL); writel_relaxed(1, base + GIC_DIST_CTRL); } @@ -439,18 +399,7 @@ static void gic_cpu_init(struct gic_chip_data *gic) if (i != cpu) gic_cpu_map[i] &= ~cpu_mask; - /* - * Deal with the banked PPI and SGI interrupts - disable all - * PPI interrupts, ensure all SGI interrupts are enabled. - */ - writel_relaxed(0xffff0000, dist_base + GIC_DIST_ENABLE_CLEAR); - writel_relaxed(0x0000ffff, dist_base + GIC_DIST_ENABLE_SET); - - /* - * Set priority on PPI and SGI interrupts - */ - for (i = 0; i < 32; i += 4) - writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 / 4); + gic_cpu_config(dist_base, NULL); writel_relaxed(0xf0, base + GIC_CPU_PRIMASK); writel_relaxed(1, base + GIC_CPU_CTRL); -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
