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67 lines
2.1 KiB
Diff
67 lines
2.1 KiB
Diff
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From f68ce73c7508d674266f048043e0cc390c1f128a Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 14 Jun 2018 11:21:04 +0100
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Subject: [PATCH] irqchip: irq-bcm2835: Calc. FIQ_START at boot-time
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ad83c7cb2f37 ("irqchip/irq-bcm2836: Add support for DT interrupt polarity")
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changed the way that the BCM2836/7 local interrupts are mapped; instead
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of being pre-mapped they are now mapped on-demand. A side effect of this
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change is that the call to irq_of_parse_and_map from armctrl_of_init
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creates a new mapping, forming a gap between the IRQs and the FIQs. This
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gap breaks the FIQ<->IRQ mapping which up to now has been done by assuming:
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1) that the value of FIQ_START is the same as the number of normal IRQs
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that will be mapped (still true), and
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2) that this value is also the offset between an IRQ and its equivalent
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FIQ (which is no longer the case).
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Remove both assumptions by measuring the interval between the last IRQ
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and the last FIQ, passing it as the parameter to init_FIQ().
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Fixes: https://github.com/raspberrypi/linux/issues/2432
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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 | 8 ++++----
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1 file changed, 4 insertions(+), 4 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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@@ -73,8 +73,6 @@
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#define NR_BANKS 3
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#define IRQS_PER_BANK 32
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#define NUMBER_IRQS MAKE_HWIRQ(NR_BANKS, 0)
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-#undef FIQ_START
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-#define FIQ_START (NR_IRQS_BANK0 + MAKE_HWIRQ(NR_BANKS - 1, 0))
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static const int reg_pending[] __initconst = { 0x00, 0x04, 0x08 };
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static const int reg_enable[] __initconst = { 0x18, 0x10, 0x14 };
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@@ -202,7 +200,7 @@ static int __init armctrl_of_init(struct
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bool is_2836)
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{
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void __iomem *base;
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- int irq, b, i;
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+ int irq = 0, last_irq, b, i;
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base = of_iomap(node, 0);
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if (!base)
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@@ -228,6 +226,8 @@ static int __init armctrl_of_init(struct
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}
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}
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+ last_irq = irq;
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+
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if (is_2836) {
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int parent_irq = irq_of_parse_and_map(node, 0);
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@@ -258,7 +258,7 @@ static int __init armctrl_of_init(struct
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}
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}
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#ifndef CONFIG_ARM64
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- init_FIQ(FIQ_START);
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+ init_FIQ(irq - last_irq);
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#endif
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return 0;
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