diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0029-irqchip-irq-bcm2836-Remove-regmap-and-syscon-use.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0029-irqchip-irq-bcm2836-Remove-regmap-and-syscon-use.patch | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0029-irqchip-irq-bcm2836-Remove-regmap-and-syscon-use.patch b/target/linux/bcm27xx/patches-5.4/950-0029-irqchip-irq-bcm2836-Remove-regmap-and-syscon-use.patch new file mode 100644 index 0000000000..a3a85da9cf --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0029-irqchip-irq-bcm2836-Remove-regmap-and-syscon-use.patch @@ -0,0 +1,112 @@ +From fef7d3ecae689f5f6eeb75da93f431d1a8a3200b Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +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 <phil@raspberrypi.org> +--- + 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 <linux/of_irq.h> + #include <linux/irqchip.h> + #include <linux/irqdomain.h> +-#include <linux/mfd/syscon.h> +-#include <linux/regmap.h> + + #include <asm/exception.h> + #include <asm/mach/irq.h> +@@ -91,7 +89,7 @@ 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; +@@ -128,24 +126,20 @@ 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), +@@ -231,12 +225,10 @@ 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 +@@ -21,6 +21,9 @@ 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) +@@ -225,6 +228,8 @@ 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, |