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Patch #1392287 by Brandon Low - faster LCD update for H300 with ASM

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8293 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2005-12-28 22:49:22 +00:00
parent b770d53cb4
commit bd2f678b70
2 changed files with 31 additions and 1 deletions
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1
docs/CREDITS
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@ -151,3 +151,4 @@ Jeong Taek In
Anders Kagerin
Peter D'Hoye
Ben Basha
Brandon Low

29
firmware/drivers/lcd-h300.c
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@ -93,8 +93,37 @@ inline void lcd_begin_write_gram(void)
inline void lcd_write_data(const unsigned short* p_bytes, int count) ICODE_ATTR;
inline void lcd_write_data(const unsigned short* p_bytes, int count)
{
int precount = ((-(size_t)p_bytes) & 0xf) / 2;
count -= precount;
while(precount--)
*(volatile unsigned short *)0xf0000002 = *p_bytes++;
while((count -= 8) >= 0) asm (
"\n\tmovem.l (%[p_bytes]),%%d1-%%d4\
\n\tswap %%d1\
\n\tmove.w %%d1,(%[dest])\
\n\tswap %%d1\
\n\tmove.w %%d1,(%[dest])\
\n\tswap %%d2\
\n\tmove.w %%d2,(%[dest])\
\n\tswap %%d2\
\n\tmove.w %%d2,(%[dest])\
\n\tswap %%d3\
\n\tmove.w %%d3,(%[dest])\
\n\tswap %%d3\
\n\tmove.w %%d3,(%[dest])\
\n\tswap %%d4\
\n\tmove.w %%d4,(%[dest])\
\n\tswap %%d4\
\n\tmove.w %%d4,(%[dest])\
\n\tlea.l (16,%[p_bytes]),%[p_bytes]"
: [p_bytes] "+a" (p_bytes)
: [dest] "a" ((volatile unsigned short *)0xf0000002)
: "d1", "d2", "d3", "d4", "memory");
if (count != 0) {
count += 8;
while(count--)
*(volatile unsigned short *)0xf0000002 = *p_bytes++;
}
}
/*** hardware configuration ***/