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[MIPS] IP22: Fix broken eeprom access by using __raw_readl/__raw_writel 

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Thomas Bogendoerfer 2007-11-23 20:40:15 +01:00 committed by Ralf Baechle
parent 68de480372
commit 5b3af8f19f
1 changed files with 21 additions and 19 deletions
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40
arch/mips/sgi-ip22/ip22-nvram.c
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@ -32,19 +32,19 @@
for (x=0; x<100000; x++) __asm__ __volatile__(""); })
#define eeprom_cs_on(ptr) ({ \
*ptr &= ~EEPROM_DATO; \
*ptr &= ~EEPROM_ECLK; \
*ptr &= ~EEPROM_EPROT; \
delay(); \
*ptr |= EEPROM_CSEL; \
*ptr |= EEPROM_ECLK; })
__raw_writel(__raw_readl(ptr) & ~EEPROM_DATO, ptr); \
__raw_writel(__raw_readl(ptr) & ~EEPROM_ECLK, ptr); \
__raw_writel(__raw_readl(ptr) & ~EEPROM_EPROT, ptr); \
delay(); \
__raw_writel(__raw_readl(ptr) | EEPROM_CSEL, ptr); \
__raw_writel(__raw_readl(ptr) | EEPROM_ECLK, ptr); })
#define eeprom_cs_off(ptr) ({ \
*ptr &= ~EEPROM_ECLK; \
*ptr &= ~EEPROM_CSEL; \
*ptr |= EEPROM_EPROT; \
*ptr |= EEPROM_ECLK; })
__raw_writel(__raw_readl(ptr) & ~EEPROM_ECLK, ptr); \
__raw_writel(__raw_readl(ptr) & ~EEPROM_CSEL, ptr); \
__raw_writel(__raw_readl(ptr) | EEPROM_EPROT, ptr); \
__raw_writel(__raw_readl(ptr) | EEPROM_ECLK, ptr); })
#define BITS_IN_COMMAND 11
/*
@ -60,15 +60,17 @@ static inline void eeprom_cmd(unsigned int *ctrl, unsigned cmd, unsigned reg)
ser_cmd = cmd | (reg << (16 - BITS_IN_COMMAND));
for (i = 0; i < BITS_IN_COMMAND; i++) {
if (ser_cmd & (1<<15)) /* if high order bit set */
writel(readl(ctrl) | EEPROM_DATO, ctrl);
__raw_writel(__raw_readl(ctrl) | EEPROM_DATO, ctrl);
else
writel(readl(ctrl) & ~EEPROM_DATO, ctrl);
writel(readl(ctrl) & ~EEPROM_ECLK, ctrl);
writel(readl(ctrl) | EEPROM_ECLK, ctrl);
__raw_writel(__raw_readl(ctrl) & ~EEPROM_DATO, ctrl);
__raw_writel(__raw_readl(ctrl) & ~EEPROM_ECLK, ctrl);
delay();
__raw_writel(__raw_readl(ctrl) | EEPROM_ECLK, ctrl);
delay();
ser_cmd <<= 1;
}
/* see data sheet timing diagram */
writel(readl(ctrl) & ~EEPROM_DATO, ctrl);
__raw_writel(__raw_readl(ctrl) & ~EEPROM_DATO, ctrl);
}
unsigned short ip22_eeprom_read(unsigned int *ctrl, int reg)
@ -76,18 +78,18 @@ unsigned short ip22_eeprom_read(unsigned int *ctrl, int reg)
unsigned short res = 0;
int i;
writel(readl(ctrl) & ~EEPROM_EPROT, ctrl);
__raw_writel(__raw_readl(ctrl) & ~EEPROM_EPROT, ctrl);
eeprom_cs_on(ctrl);
eeprom_cmd(ctrl, EEPROM_READ, reg);
/* clock the data ouf of serial mem */
for (i = 0; i < 16; i++) {
writel(readl(ctrl) & ~EEPROM_ECLK, ctrl);
__raw_writel(__raw_readl(ctrl) & ~EEPROM_ECLK, ctrl);
delay();
writel(readl(ctrl) | EEPROM_ECLK, ctrl);
__raw_writel(__raw_readl(ctrl) | EEPROM_ECLK, ctrl);
delay();
res <<= 1;
if (readl(ctrl) & EEPROM_DATI)
if (__raw_readl(ctrl) & EEPROM_DATI)
res |= 1;
}