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113 lines
3.6 KiB
Diff
113 lines
3.6 KiB
Diff
From f1905bc5137db49ef155f835d52d68cb86c4c9a9 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 23 Jan 2018 16:52:45 +0000
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Subject: [PATCH] irqchip: irq-bcm2836: Remove regmap and syscon use
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The syscon node defines a register range that duplicates that used by
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the local_intc node on bcm2836/7. Since irq-bcm2835 and irq-bcm2836 are
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built in and always present together (both drivers are enabled by
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CONFIG_ARCH_BCM2835), it is possible to replace the syscon usage with a
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global variable that simplifies the code. Doing so does lose the
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locking provided by regmap, but as only one side is using the regmap
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interface (irq-bcm2835 uses readl and write) there is no loss of
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atomicity.
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See: https://github.com/raspberrypi/firmware/issues/926
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/irqchip/irq-bcm2835.c | 32 ++++++++++++--------------------
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drivers/irqchip/irq-bcm2836.c | 5 +++++
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2 files changed, 17 insertions(+), 20 deletions(-)
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--- a/drivers/irqchip/irq-bcm2835.c
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+++ b/drivers/irqchip/irq-bcm2835.c
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@@ -50,8 +50,6 @@
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#include <linux/of_irq.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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-#include <linux/mfd/syscon.h>
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-#include <linux/regmap.h>
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#include <asm/exception.h>
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#include <asm/mach/irq.h>
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@@ -100,7 +98,7 @@ struct armctrl_ic {
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void __iomem *enable[NR_BANKS];
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void __iomem *disable[NR_BANKS];
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struct irq_domain *domain;
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- struct regmap *local_regmap;
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+ void __iomem *local_base;
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};
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static struct armctrl_ic intc __read_mostly;
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@@ -137,24 +135,20 @@ static void armctrl_unmask_irq(struct ir
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if (d->hwirq >= NUMBER_IRQS) {
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if (num_online_cpus() > 1) {
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unsigned int data;
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- int ret;
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- if (!intc.local_regmap) {
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- pr_err("FIQ is disabled due to missing regmap\n");
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+ if (!intc.local_base) {
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+ pr_err("FIQ is disabled due to missing arm_local_intc\n");
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return;
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}
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- ret = regmap_read(intc.local_regmap,
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- ARM_LOCAL_GPU_INT_ROUTING, &data);
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- if (ret) {
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- pr_err("Failed to read int routing %d\n", ret);
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- return;
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- }
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+ data = readl_relaxed(intc.local_base +
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+ ARM_LOCAL_GPU_INT_ROUTING);
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data &= ~0xc;
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data |= (1 << 2);
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- regmap_write(intc.local_regmap,
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- ARM_LOCAL_GPU_INT_ROUTING, data);
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+ writel_relaxed(data,
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+ intc.local_base +
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+ ARM_LOCAL_GPU_INT_ROUTING);
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}
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writel_relaxed(REG_FIQ_ENABLE | hwirq_to_fiq(d->hwirq),
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@@ -240,12 +234,10 @@ static int __init armctrl_of_init(struct
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}
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if (is_2836) {
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- intc.local_regmap =
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- syscon_regmap_lookup_by_compatible("brcm,bcm2836-arm-local");
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- if (IS_ERR(intc.local_regmap)) {
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- pr_err("Failed to get local register map. FIQ is disabled for cpus > 1\n");
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- intc.local_regmap = NULL;
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- }
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+ extern void __iomem * __attribute__((weak)) arm_local_intc;
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+ intc.local_base = arm_local_intc;
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+ if (!intc.local_base)
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+ pr_err("Failed to get local intc base. FIQ is disabled for cpus > 1\n");
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}
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/* Make a duplicate irq range which is used to enable FIQ */
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--- a/drivers/irqchip/irq-bcm2836.c
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+++ b/drivers/irqchip/irq-bcm2836.c
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@@ -30,6 +30,9 @@ struct bcm2836_arm_irqchip_intc {
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static struct bcm2836_arm_irqchip_intc intc __read_mostly;
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+void __iomem *arm_local_intc;
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+EXPORT_SYMBOL_GPL(arm_local_intc);
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+
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static void bcm2836_arm_irqchip_mask_per_cpu_irq(unsigned int reg_offset,
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unsigned int bit,
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int cpu)
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@@ -234,6 +237,8 @@ static int __init bcm2836_arm_irqchip_l1
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panic("%pOF: unable to map local interrupt registers\n", node);
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}
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+ arm_local_intc = intc.base;
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+
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bcm2835_init_local_timer_frequency();
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intc.domain = irq_domain_add_linear(node, LAST_IRQ + 1,
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