From a27ad8b9cf6ad18b033fe9e34be3a1de3bea6c69 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 23 Jan 2018 16:52:45 +0000 Subject: [PATCH] irqchip: irq-bcm2836: Remove regmap and syscon use The syscon node defines a register range that duplicates that used by the local_intc node on bcm2836/7. Since irq-bcm2835 and irq-bcm2836 are built in and always present together (both drivers are enabled by CONFIG_ARCH_BCM2835), it is possible to replace the syscon usage with a global variable that simplifies the code. Doing so does lose the locking provided by regmap, but as only one side is using the regmap interface (irq-bcm2835 uses readl and write) there is no loss of atomicity. See: https://github.com/raspberrypi/firmware/issues/926 Signed-off-by: Phil Elwell --- drivers/irqchip/irq-bcm2835.c | 32 ++++++++++++-------------------- drivers/irqchip/irq-bcm2836.c | 5 +++++ 2 files changed, 17 insertions(+), 20 deletions(-) --- a/drivers/irqchip/irq-bcm2835.c +++ b/drivers/irqchip/irq-bcm2835.c @@ -41,8 +41,6 @@ #include #include #include -#include -#include #include #include @@ -92,7 +90,7 @@ struct armctrl_ic { void __iomem *enable[NR_BANKS]; void __iomem *disable[NR_BANKS]; struct irq_domain *domain; - struct regmap *local_regmap; + void __iomem *local_base; }; static struct armctrl_ic intc __read_mostly; @@ -129,24 +127,20 @@ static void armctrl_unmask_irq(struct ir if (d->hwirq >= NUMBER_IRQS) { if (num_online_cpus() > 1) { unsigned int data; - int ret; - if (!intc.local_regmap) { - pr_err("FIQ is disabled due to missing regmap\n"); + if (!intc.local_base) { + pr_err("FIQ is disabled due to missing arm_local_intc\n"); return; } - ret = regmap_read(intc.local_regmap, - ARM_LOCAL_GPU_INT_ROUTING, &data); - if (ret) { - pr_err("Failed to read int routing %d\n", ret); - return; - } + data = readl_relaxed(intc.local_base + + ARM_LOCAL_GPU_INT_ROUTING); data &= ~0xc; data |= (1 << 2); - regmap_write(intc.local_regmap, - ARM_LOCAL_GPU_INT_ROUTING, data); + writel_relaxed(data, + intc.local_base + + ARM_LOCAL_GPU_INT_ROUTING); } writel_relaxed(REG_FIQ_ENABLE | hwirq_to_fiq(d->hwirq), @@ -246,12 +240,10 @@ static int __init armctrl_of_init(struct } if (is_2836) { - intc.local_regmap = - syscon_regmap_lookup_by_compatible("brcm,bcm2836-arm-local"); - if (IS_ERR(intc.local_regmap)) { - pr_err("Failed to get local register map. FIQ is disabled for cpus > 1\n"); - intc.local_regmap = NULL; - } + extern void __iomem * __attribute__((weak)) arm_local_intc; + intc.local_base = arm_local_intc; + if (!intc.local_base) + pr_err("Failed to get local intc base. FIQ is disabled for cpus > 1\n"); } /* Make a duplicate irq range which is used to enable FIQ */ --- a/drivers/irqchip/irq-bcm2836.c +++ b/drivers/irqchip/irq-bcm2836.c @@ -22,6 +22,9 @@ struct bcm2836_arm_irqchip_intc { static struct bcm2836_arm_irqchip_intc intc __read_mostly; +void __iomem *arm_local_intc; +EXPORT_SYMBOL_GPL(arm_local_intc); + static void bcm2836_arm_irqchip_mask_per_cpu_irq(unsigned int reg_offset, unsigned int bit, int cpu) @@ -323,6 +326,8 @@ static int __init bcm2836_arm_irqchip_l1 panic("%pOF: unable to map local interrupt registers\n", node); } + arm_local_intc = intc.base; + bcm2835_init_local_timer_frequency(); intc.domain = irq_domain_add_linear(node, LAST_IRQ + 1,