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MIPS: GIC: Fix GICBIS macro

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The GICBIS macro could update the GIC registers incorrectly, depending
on the data value passed in:

* Bits were only OR'd into the register data, so register fields could
  not be cleared.

* Bits were OR'd into the register data without masking the data to the
  correct field width, corrupting adjacent bits.

Signed-off-by: Jeffrey Deans <jeffrey.deans@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7378/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jeffrey Deans 2014-07-17 09:20:59 +01:00 committed by Ralf Baechle
parent 1c772b5664
commit c55b2851f9
1 changed files with 11 additions and 10 deletions
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21
arch/mips/include/asm/gic.h
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@ -43,18 +43,17 @@
#ifdef GICISBYTELITTLEENDIAN
#define GICREAD(reg, data) ((data) = (reg), (data) = le32_to_cpu(data))
#define GICWRITE(reg, data) ((reg) = cpu_to_le32(data))
#define GICBIS(reg, bits) \
({unsigned int data; \
GICREAD(reg, data); \
data |= bits; \
GICWRITE(reg, data); \
})
#else
#define GICREAD(reg, data) ((data) = (reg))
#define GICWRITE(reg, data) ((reg) = (data))
#define GICBIS(reg, bits) ((reg) |= (bits))
#endif
#define GICBIS(reg, mask, bits) \
do { u32 data; \
GICREAD((reg), data); \
data &= ~(mask); \
data |= ((bits) & (mask)); \
GICWRITE((reg), data); \
} while (0)
/* GIC Address Space */
@ -170,13 +169,15 @@
#define GIC_SH_SET_POLARITY_OFS 0x0100
#define GIC_SET_POLARITY(intr, pol) \
GICBIS(GIC_REG_ADDR(SHARED, GIC_SH_SET_POLARITY_OFS + \
GIC_INTR_OFS(intr)), (pol) << GIC_INTR_BIT(intr))
GIC_INTR_OFS(intr)), (1 << GIC_INTR_BIT(intr)), \
(pol) << GIC_INTR_BIT(intr))
/* Triggering : Reset Value is always 0 */
#define GIC_SH_SET_TRIGGER_OFS 0x0180
#define GIC_SET_TRIGGER(intr, trig) \
GICBIS(GIC_REG_ADDR(SHARED, GIC_SH_SET_TRIGGER_OFS + \
GIC_INTR_OFS(intr)), (trig) << GIC_INTR_BIT(intr))
GIC_INTR_OFS(intr)), (1 << GIC_INTR_BIT(intr)), \
(trig) << GIC_INTR_BIT(intr))
/* Mask manipulation */
#define GIC_SH_SMASK_OFS 0x0380