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ARM: 7635/1: versatile: fix the PCI IRQ regression

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The PCI IRQs were regressing due to two things:

- The PCI glue layer was using an hard-coded IRQ 27 offset.
  This caused the immediate regression.

- The SIC IRQ mask was inverted (i.e. a bit was indeed set to
  one for each valid IRQ on the SIC, but accidentally inverted
  in the init call). This has been around forever, but we have
  been saved by some other forgiving code that would reserve
  IRQ descriptors in this range, as the versatile is
  non-sparse.

When the IRQs were bumped up 32 steps so as to avoid using IRQ
zero and avoid touching the 16 legacy IRQs, things broke.

Introduce an explicit valid mask for the IRQs that are active
on the PIC/SIC, and pass that. Use the BIT() macro from
<linux/bitops.h> to make sure we hit the right bits, readily
defined in <mach/platform.h>.

Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2013-01-28 21:58:22 +01:00 committed by Russell King
parent 4e79a62d84
commit e3e92a7be6
2 changed files with 20 additions and 6 deletions
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15
arch/arm/mach-versatile/core.c
View file

@ -36,6 +36,7 @@
#include <linux/gfp.h>
#include <linux/clkdev.h>
#include <linux/mtd/physmap.h>
#include <linux/bitops.h>
#include <asm/irq.h>
#include <asm/hardware/arm_timer.h>
@ -65,16 +66,28 @@
#define VA_VIC_BASE __io_address(VERSATILE_VIC_BASE)
#define VA_SIC_BASE __io_address(VERSATILE_SIC_BASE)
/* These PIC IRQs are valid in each configuration */
#define PIC_VALID_ALL BIT(SIC_INT_KMI0) | BIT(SIC_INT_KMI1) | \
BIT(SIC_INT_SCI3) | BIT(SIC_INT_UART3) | \
BIT(SIC_INT_CLCD) | BIT(SIC_INT_TOUCH) | \
BIT(SIC_INT_KEYPAD) | BIT(SIC_INT_DoC) | \
BIT(SIC_INT_USB) | BIT(SIC_INT_PCI0) | \
BIT(SIC_INT_PCI1) | BIT(SIC_INT_PCI2) | \
BIT(SIC_INT_PCI3)
#if 1
#define IRQ_MMCI0A IRQ_VICSOURCE22
#define IRQ_AACI IRQ_VICSOURCE24
#define IRQ_ETH IRQ_VICSOURCE25
#define PIC_MASK 0xFFD00000
#define PIC_VALID PIC_VALID_ALL
#else
#define IRQ_MMCI0A IRQ_SIC_MMCI0A
#define IRQ_AACI IRQ_SIC_AACI
#define IRQ_ETH IRQ_SIC_ETH
#define PIC_MASK 0
#define PIC_VALID PIC_VALID_ALL | BIT(SIC_INT_MMCI0A) | \
BIT(SIC_INT_MMCI1A) | BIT(SIC_INT_AACI) | \
BIT(SIC_INT_ETH)
#endif
/* Lookup table for finding a DT node that represents the vic instance */
@ -102,7 +115,7 @@ void __init versatile_init_irq(void)
VERSATILE_SIC_BASE);
fpga_irq_init(VA_SIC_BASE, "SIC", IRQ_SIC_START,
IRQ_VICSOURCE31, ~PIC_MASK, np);
IRQ_VICSOURCE31, PIC_VALID, np);
/*
* Interrupts on secondary controller from 0 to 8 are routed to

11
arch/arm/mach-versatile/pci.c
View file

@ -23,6 +23,7 @@
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
@ -327,12 +328,12 @@ static int __init versatile_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
int irq;
/* slot, pin, irq
* 24 1 27
* 25 1 28
* 26 1 29
* 27 1 30
* 24 1 IRQ_SIC_PCI0
* 25 1 IRQ_SIC_PCI1
* 26 1 IRQ_SIC_PCI2
* 27 1 IRQ_SIC_PCI3
*/
irq = 27 + ((slot - 24 + pin - 1) & 3);
irq = IRQ_SIC_PCI0 + ((slot - 24 + pin - 1) & 3);
return irq;
}