brcm2708: add linux 4.19 support

Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

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

1 files changed, 99 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.19/950-0009-irqchip-irq-bcm2835-Add-2836-FIQ-support.patch b/target/linux/brcm2708/patches-4.19/950-0009-irqchip-irq-bcm2835-Add-2836-FIQ-support.patch
new file mode 100644
index 0000000000..1efa0b4d97
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0009-irqchip-irq-bcm2835-Add-2836-FIQ-support.patch
@@ -0,0 +1,99 @@
+From 9c8894afe627b270aad44c64f4e70c659468d7ed Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
+Date: Fri, 23 Oct 2015 16:26:55 +0200
+Subject: [PATCH 009/703] irqchip: irq-bcm2835: Add 2836 FIQ support
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
+---
+ drivers/irqchip/irq-bcm2835.c | 43 +++++++++++++++++++++++++++++++++--
+ 1 file changed, 41 insertions(+), 2 deletions(-)
+
+--- a/drivers/irqchip/irq-bcm2835.c
++++ b/drivers/irqchip/irq-bcm2835.c
+@@ -50,8 +50,11 @@
+ #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>
+ 
+ /* Put the bank and irq (32 bits) into the hwirq */
+ #define MAKE_HWIRQ(b, n)	(((b) << 5) | (n))
+@@ -69,6 +72,9 @@
+ #define BANK0_VALID_MASK	(BANK0_HWIRQ_MASK | BANK1_HWIRQ | BANK2_HWIRQ \
+ 					| SHORTCUT1_MASK | SHORTCUT2_MASK)
+ 
++#undef ARM_LOCAL_GPU_INT_ROUTING
++#define ARM_LOCAL_GPU_INT_ROUTING 0x0c
++
+ #define REG_FIQ_CONTROL		0x0c
+ #define REG_FIQ_ENABLE		0x80
+ #define REG_FIQ_DISABLE		0
+@@ -94,6 +100,7 @@ struct armctrl_ic {
+ 	void __iomem *enable[NR_BANKS];
+ 	void __iomem *disable[NR_BANKS];
+ 	struct irq_domain *domain;
++	struct regmap *local_regmap;
+ };
+ 
+ static struct armctrl_ic intc __read_mostly;
+@@ -127,12 +134,35 @@ static void armctrl_mask_irq(struct irq_
+ 
+ static void armctrl_unmask_irq(struct irq_data *d)
+ {
+-	if (d->hwirq >= NUMBER_IRQS)
++	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");
++				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 &= ~0xc;
++			data |= (1 << 2);
++			regmap_write(intc.local_regmap,
++				     ARM_LOCAL_GPU_INT_ROUTING, data);
++		}
++
+ 		writel_relaxed(REG_FIQ_ENABLE | hwirq_to_fiq(d->hwirq),
+ 			       intc.base + REG_FIQ_CONTROL);
+-	else
++	} else {
+ 		writel_relaxed(HWIRQ_BIT(d->hwirq),
+ 			       intc.enable[HWIRQ_BANK(d->hwirq)]);
++	}
+ }
+ 
+ static struct irq_chip armctrl_chip = {
+@@ -209,6 +239,15 @@ static int __init armctrl_of_init(struct
+ 		set_handle_irq(bcm2835_handle_irq);
+ 	}
+ 
++	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;
++		}
++	}
++
+ 	/* Make a duplicate irq range which is used to enable FIQ */
+ 	for (b = 0; b < NR_BANKS; b++) {
+ 		for (i = 0; i < bank_irqs[b]; i++) {