bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

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,