diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/0007-irqchip-bcm2835-Add-FIQ-support.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/0007-irqchip-bcm2835-Add-FIQ-support.patch | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/0007-irqchip-bcm2835-Add-FIQ-support.patch b/target/linux/brcm2708/patches-4.9/0007-irqchip-bcm2835-Add-FIQ-support.patch new file mode 100644 index 0000000000..a25275f073 --- /dev/null +++ b/target/linux/brcm2708/patches-4.9/0007-irqchip-bcm2835-Add-FIQ-support.patch @@ -0,0 +1,127 @@ +From 0c9c73fafac86e96a1d1fb59b13aac0ce6d70692 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org> +Date: Fri, 12 Jun 2015 19:01:05 +0200 +Subject: [PATCH] irqchip: bcm2835: Add FIQ support +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Add a duplicate irq range with an offset on the hwirq's so the +driver can detect that enable_fiq() is used. +Tested with downstream dwc_otg USB controller driver. + +Signed-off-by: Noralf Trønnes <noralf@tronnes.org> +Reviewed-by: Eric Anholt <eric@anholt.net> +Acked-by: Stephen Warren <swarren@wwwdotorg.org> +--- + arch/arm/mach-bcm/Kconfig | 1 + + drivers/irqchip/irq-bcm2835.c | 51 ++++++++++++++++++++++++++++++++++++++----- + 2 files changed, 47 insertions(+), 5 deletions(-) + +--- a/arch/arm/mach-bcm/Kconfig ++++ b/arch/arm/mach-bcm/Kconfig +@@ -152,6 +152,7 @@ config ARCH_BCM2835 + select HAVE_ARM_ARCH_TIMER if ARCH_MULTI_V7 + select CLKSRC_OF + select BCM2835_TIMER ++ select FIQ + select PINCTRL + select PINCTRL_BCM2835 + help +--- a/drivers/irqchip/irq-bcm2835.c ++++ b/drivers/irqchip/irq-bcm2835.c +@@ -54,7 +54,7 @@ + #include <asm/exception.h> + + /* Put the bank and irq (32 bits) into the hwirq */ +-#define MAKE_HWIRQ(b, n) ((b << 5) | (n)) ++#define MAKE_HWIRQ(b, n) (((b) << 5) | (n)) + #define HWIRQ_BANK(i) (i >> 5) + #define HWIRQ_BIT(i) BIT(i & 0x1f) + +@@ -70,9 +70,13 @@ + | SHORTCUT1_MASK | SHORTCUT2_MASK) + + #define REG_FIQ_CONTROL 0x0c ++#define REG_FIQ_ENABLE 0x80 ++#define REG_FIQ_DISABLE 0 + + #define NR_BANKS 3 + #define IRQS_PER_BANK 32 ++#define NUMBER_IRQS MAKE_HWIRQ(NR_BANKS, 0) ++#define FIQ_START (NR_IRQS_BANK0 + MAKE_HWIRQ(NR_BANKS - 1, 0)) + + static const int reg_pending[] __initconst = { 0x00, 0x04, 0x08 }; + static const int reg_enable[] __initconst = { 0x18, 0x10, 0x14 }; +@@ -97,14 +101,38 @@ static void __exception_irq_entry bcm283 + struct pt_regs *regs); + static void bcm2836_chained_handle_irq(struct irq_desc *desc); + ++static inline unsigned int hwirq_to_fiq(unsigned long hwirq) ++{ ++ hwirq -= NUMBER_IRQS; ++ /* ++ * The hwirq numbering used in this driver is: ++ * BASE (0-7) GPU1 (32-63) GPU2 (64-95). ++ * This differ from the one used in the FIQ register: ++ * GPU1 (0-31) GPU2 (32-63) BASE (64-71) ++ */ ++ if (hwirq >= 32) ++ return hwirq - 32; ++ ++ return hwirq + 64; ++} ++ + static void armctrl_mask_irq(struct irq_data *d) + { +- writel_relaxed(HWIRQ_BIT(d->hwirq), intc.disable[HWIRQ_BANK(d->hwirq)]); ++ if (d->hwirq >= NUMBER_IRQS) ++ writel_relaxed(REG_FIQ_DISABLE, intc.base + REG_FIQ_CONTROL); ++ else ++ writel_relaxed(HWIRQ_BIT(d->hwirq), ++ intc.disable[HWIRQ_BANK(d->hwirq)]); + } + + static void armctrl_unmask_irq(struct irq_data *d) + { +- writel_relaxed(HWIRQ_BIT(d->hwirq), intc.enable[HWIRQ_BANK(d->hwirq)]); ++ if (d->hwirq >= NUMBER_IRQS) ++ writel_relaxed(REG_FIQ_ENABLE | hwirq_to_fiq(d->hwirq), ++ intc.base + REG_FIQ_CONTROL); ++ else ++ writel_relaxed(HWIRQ_BIT(d->hwirq), ++ intc.enable[HWIRQ_BANK(d->hwirq)]); + } + + static struct irq_chip armctrl_chip = { +@@ -150,8 +178,9 @@ static int __init armctrl_of_init(struct + panic("%s: unable to map IC registers\n", + node->full_name); + +- intc.domain = irq_domain_add_linear(node, MAKE_HWIRQ(NR_BANKS, 0), +- &armctrl_ops, NULL); ++ intc.base = base; ++ intc.domain = irq_domain_add_linear(node, NUMBER_IRQS * 2, ++ &armctrl_ops, NULL); + if (!intc.domain) + panic("%s: unable to create IRQ domain\n", node->full_name); + +@@ -181,6 +210,18 @@ static int __init armctrl_of_init(struct + set_handle_irq(bcm2835_handle_irq); + } + ++ /* 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++) { ++ irq = irq_create_mapping(intc.domain, ++ MAKE_HWIRQ(b, i) + NUMBER_IRQS); ++ BUG_ON(irq <= 0); ++ irq_set_chip(irq, &armctrl_chip); ++ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); ++ } ++ } ++ init_FIQ(FIQ_START); ++ + return 0; + } + |