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Add generic 16 bit and 32 bit chip read/write emulation to the external flasher infrastructure

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The emulation works by splitting 32 bit accesses into 16 bit accesses
and 16 bit accesses into to 8 bit accesses. That way, external flashers
can mix and match the amount of emulation they need.

Corresponding to flashrom svn r517.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
This commit is contained in:
Carl-Daniel Hailfinger
2009-05-16 01:23:55 +00:00
parent 9862251f89
commit 9ee107721f
4 changed files with 39 additions and 26 deletions
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31
internal.c
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@ -168,3 +168,34 @@ uint32_t internal_chip_readl(const volatile void *addr)
return *(volatile uint32_t *) addr;
}
/* Little-endian fallback for drivers not supporting 16 bit accesses */
void fallback_chip_writew(uint16_t val, volatile void *addr)
{
chip_writeb(val & 0xff, addr);
chip_writeb((val >> 8) & 0xff, addr + 1);
}
/* Little-endian fallback for drivers not supporting 16 bit accesses */
uint16_t fallback_chip_readw(const volatile void *addr)
{
uint16_t val;
val = chip_readb(addr);
val |= chip_readb(addr + 1) << 8;
return val;
}
/* Little-endian fallback for drivers not supporting 32 bit accesses */
void fallback_chip_writel(uint32_t val, volatile void *addr)
{
chip_writew(val & 0xffff, addr);
chip_writew((val >> 16) & 0xffff, addr + 2);
}
/* Little-endian fallback for drivers not supporting 32 bit accesses */
uint32_t fallback_chip_readl(const volatile void *addr)
{
uint32_t val;
val = chip_readw(addr);
val |= chip_readw(addr + 2) << 16;
return val;
}