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openwrtv4/target/linux/brcm2708/patches-4.1/0054-bcm2709-Simplify-and-strip-down-IRQ-handler.patch
John Crispin bf28fb50bf brcm2708: update 4.1 patches 
As usual, this patches were taken (and rebased) from
https://github.com/raspberrypi/linux/commits/rpi-4.1.y

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

SVN-Revision: 47258
2015-10-26 09:01:05 +00:00

222 lines
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From 4427da11c90fced3efd244e90d408d12bfdeb8c2 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Fri, 20 Jun 2014 17:19:27 +0100
Subject: [PATCH 054/203] bcm2709: Simplify and strip down IRQ handler
---
arch/arm/include/asm/entry-macro-multi.S | 2 +
arch/arm/mach-bcm2709/include/mach/entry-macro.S | 173 +++++++++++------------
2 files changed, 87 insertions(+), 88 deletions(-)
--- a/arch/arm/include/asm/entry-macro-multi.S
+++ b/arch/arm/include/asm/entry-macro-multi.S
@@ -1,5 +1,6 @@
#include <asm/assembler.h>
+#ifndef CONFIG_ARCH_BCM2709
/*
* Interrupt handling. Preserves r7, r8, r9
*/
@@ -28,6 +29,7 @@
#endif
9997:
.endm
+#endif
.macro arch_irq_handler, symbol_name
.align 5
--- a/arch/arm/mach-bcm2709/include/mach/entry-macro.S
+++ b/arch/arm/mach-bcm2709/include/mach/entry-macro.S
@@ -22,102 +22,99 @@
#include <mach/hardware.h>
#include <mach/irqs.h>
- .macro disable_fiq
- .endm
+ .macro arch_ret_to_user, tmp1, tmp2
+ .endm
- .macro get_irqnr_preamble, base, tmp
- ldr \base, =IO_ADDRESS(ARMCTRL_IC_BASE)
- .endm
-
- .macro arch_ret_to_user, tmp1, tmp2
- .endm
-
- .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
- /* get core number */
- mrc p15, 0, \tmp, c0, c0, 5
- ubfx \tmp, \tmp, #0, #2
-
- /* get core's local interrupt controller */
- ldr \irqstat, = __io_address(ARM_LOCAL_IRQ_PENDING0) @ local interrupt source
- add \irqstat, \irqstat, \tmp, lsl #2
- ldr \tmp, [\irqstat]
- /* ignore gpu interrupt */
- bic \tmp, #0x100
- /* ignore mailbox interrupts */
- bics \tmp, #0xf0
- beq 1005f
-
- @ For non-zero x, LSB(x) = 31 - CLZ(x^(x-1))
- @ N.B. CLZ is an ARM5 instruction.
- mov \irqnr, #(ARM_IRQ_LOCAL_BASE + 31)
- sub \irqstat, \tmp, #1
- eor \irqstat, \irqstat, \tmp
- clz \tmp, \irqstat
- sub \irqnr, \tmp
- b 1020f
-1005:
- /* get core number */
- mrc p15, 0, \tmp, c0, c0, 5
- ubfx \tmp, \tmp, #0, #2
-
- cmp \tmp, #1
- beq 1020f
- cmp \tmp, #2
- beq 1020f
- cmp \tmp, #3
- beq 1020f
-
- /* get masked status */
- ldr \irqstat, [\base, #(ARM_IRQ_PEND0 - ARMCTRL_IC_BASE)]
- mov \irqnr, #(ARM_IRQ0_BASE + 31)
- and \tmp, \irqstat, #0x300 @ save bits 8 and 9
- /* clear bits 8 and 9, and test */
- bics \irqstat, \irqstat, #0x300
- bne 1010f
-
- tst \tmp, #0x100
- ldrne \irqstat, [\base, #(ARM_IRQ_PEND1 - ARMCTRL_IC_BASE)]
- movne \irqnr, #(ARM_IRQ1_BASE + 31)
- @ Mask out the interrupts also present in PEND0 - see SW-5809
- bicne \irqstat, #((1<<7) | (1<<9) | (1<<10))
- bicne \irqstat, #((1<<18) | (1<<19))
- bne 1010f
-
- tst \tmp, #0x200
- ldrne \irqstat, [\base, #(ARM_IRQ_PEND2 - ARMCTRL_IC_BASE)]
- movne \irqnr, #(ARM_IRQ2_BASE + 31)
- @ Mask out the interrupts also present in PEND0 - see SW-5809
- bicne \irqstat, #((1<<21) | (1<<22) | (1<<23) | (1<<24) | (1<<25))
- bicne \irqstat, #((1<<30))
- beq 1020f
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+ /* get core number */
+ mrc p15, 0, \base, c0, c0, 5
+ ubfx \base, \base, #0, #2
+
+ /* get core's local interrupt controller */
+ ldr \irqstat, = __io_address(ARM_LOCAL_IRQ_PENDING0) @ local interrupt source
+ add \irqstat, \irqstat, \base, lsl #2
+ ldr \tmp, [\irqstat]
+#ifdef CONFIG_SMP
+ /* test for mailbox0 (IPI) interrupt */
+ tst \tmp, #0x10
+ beq 1030f
+
+ /* get core's mailbox interrupt control */
+ ldr \irqstat, = __io_address(ARM_LOCAL_MAILBOX0_CLR0) @ mbox_clr
+ add \irqstat, \irqstat, \base, lsl #4
+ ldr \tmp, [\irqstat]
+ clz \tmp, \tmp
+ rsb \irqnr, \tmp, #31
+ mov \tmp, #1
+ lsl \tmp, \irqnr
+ str \tmp, [\irqstat] @ clear interrupt source
+ dsb
+ mov r1, sp
+ adr lr, BSYM(1b)
+ b do_IPI
+#endif
+1030:
+ /* check gpu interrupt */
+ tst \tmp, #0x100
+ beq 1040f
+
+ ldr \base, =IO_ADDRESS(ARMCTRL_IC_BASE)
+ /* get masked status */
+ ldr \irqstat, [\base, #(ARM_IRQ_PEND0 - ARMCTRL_IC_BASE)]
+ mov \irqnr, #(ARM_IRQ0_BASE + 31)
+ and \tmp, \irqstat, #0x300 @ save bits 8 and 9
+ /* clear bits 8 and 9, and test */
+ bics \irqstat, \irqstat, #0x300
+ bne 1010f
+
+ tst \tmp, #0x100
+ ldrne \irqstat, [\base, #(ARM_IRQ_PEND1 - ARMCTRL_IC_BASE)]
+ movne \irqnr, #(ARM_IRQ1_BASE + 31)
+ @ Mask out the interrupts also present in PEND0 - see SW-5809
+ bicne \irqstat, #((1<<7) | (1<<9) | (1<<10))
+ bicne \irqstat, #((1<<18) | (1<<19))
+ bne 1010f
+
+ tst \tmp, #0x200
+ ldrne \irqstat, [\base, #(ARM_IRQ_PEND2 - ARMCTRL_IC_BASE)]
+ movne \irqnr, #(ARM_IRQ2_BASE + 31)
+ @ Mask out the interrupts also present in PEND0 - see SW-5809
+ bicne \irqstat, #((1<<21) | (1<<22) | (1<<23) | (1<<24) | (1<<25))
+ bicne \irqstat, #((1<<30))
+ beq 1020f
1010:
- @ For non-zero x, LSB(x) = 31 - CLZ(x^(x-1))
- @ N.B. CLZ is an ARM5 instruction.
- sub \tmp, \irqstat, #1
- eor \irqstat, \irqstat, \tmp
- clz \tmp, \irqstat
- sub \irqnr, \tmp
+ @ For non-zero x, LSB(x) = 31 - CLZ(x^(x-1))
+ sub \tmp, \irqstat, #1
+ eor \irqstat, \irqstat, \tmp
+ clz \tmp, \irqstat
+ sub \irqnr, \tmp
+ b 1050f
+1040:
+ cmp \tmp, #0
+ beq 1020f
+
+ /* handle local (e.g. timer) interrupts */
+ @ For non-zero x, LSB(x) = 31 - CLZ(x^(x-1))
+ mov \irqnr, #(ARM_IRQ_LOCAL_BASE + 31)
+ sub \irqstat, \tmp, #1
+ eor \irqstat, \irqstat, \tmp
+ clz \tmp, \irqstat
+ sub \irqnr, \tmp
+1050:
+ mov r1, sp
+ @
+ @ routine called with r0 = irq number, r1 = struct pt_regs *
+ @
+ adr lr, BSYM(1b)
+ b asm_do_IRQ
1020: @ EQ will be set if no irqs pending
+ .endm
- .endm
-
- .macro test_for_ipi, irqnr, irqstat, base, tmp
- /* get core number */
- mrc p15, 0, \tmp, c0, c0, 5
- ubfx \tmp, \tmp, #0, #2
- /* get core's mailbox interrupt control */
- ldr \irqstat, = __io_address(ARM_LOCAL_MAILBOX0_CLR0) @ mbox_clr
- add \irqstat, \irqstat, \tmp, lsl #4
- ldr \tmp, [\irqstat]
- cmp \tmp, #0
- beq 1030f
- clz \tmp, \tmp
- rsb \irqnr, \tmp, #31
- mov \tmp, #1
- lsl \tmp, \irqnr
- str \tmp, [\irqstat] @ clear interrupt source
- dsb
-1030: @ EQ will be set if no irqs pending
- .endm
+/*
+ * Interrupt handling. Preserves r7, r8, r9
+ */
+ .macro arch_irq_handler_default
+1: get_irqnr_and_base r0, r2, r6, lr
+ .endm
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