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H300: Roughly 20% faster LCD updates with DMA

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8271 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2005-12-21 00:52:02 +00:00
parent b2295a4afb
commit c70eb572c1
3 changed files with 18 additions and 7 deletions
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2
firmware/crt0.S
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@ -434,7 +434,7 @@ irq_handler:
/* Chip select 1 - LCD controller */
move.l #0xf0000000,%d0 /* CSAR1 - Base = 0xf0000000 */
move.l %d0,(0x08c,%a0)
moveq.l #0x75,%d0 /* CSMR1 - 64K, Only data access */
moveq.l #0x1,%d0 /* CSMR1 - 64K */
move.l %d0,(0x090,%a0)
move.l #0x00000180,%d0 /* CSCR1 - no wait states, 16 bits, no bursts */
move.l %d0,(0x094,%a0)

2
firmware/drivers/lcd-16bit.c
View file

@ -36,7 +36,7 @@
#define SCROLLABLE_LINES 26
/*** globals ***/
fb_data lcd_framebuffer[LCD_HEIGHT][LCD_WIDTH] __attribute__ ((aligned (4)));
fb_data lcd_framebuffer[LCD_HEIGHT][LCD_WIDTH] __attribute__ ((aligned (16)));
static unsigned fg_pattern IDATA_ATTR = LCD_DEFAULT_FG;
static unsigned bg_pattern IDATA_ATTR = LCD_DEFAULT_BG;

21
firmware/drivers/lcd-h300.c
View file

@ -89,12 +89,20 @@ inline void lcd_begin_write_gram(void)
*(volatile unsigned short *)0xf0000000 = R_WRITE_DATA_2_GRAM;
}
/* called very frequently - inline! */
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)
void lcd_write_data(const unsigned short* p_bytes, int count) ICODE_ATTR;
void lcd_write_data(const unsigned short* p_bytes, int count)
{
while(count--)
*(volatile unsigned short *)0xf0000002 = *p_bytes++;
SAR1 = (unsigned long)p_bytes; /* Destination address */
while(count)
{
int cnt = MIN(count, 256);
DAR1 = (unsigned long)0xf0000002; /* Destination address */
BCR1 = cnt*2; /* Bytes to transfer */
DCR1 = 0x02000000 | DMA_SINC | (2 << 20) | (2 << 17) | DMA_START;
while(!(DSR1 & 1)) {};
DSR1 = 1;
count -= cnt;
}
}
/*** hardware configuration ***/
@ -131,6 +139,9 @@ void lcd_roll(int lines)
/* LCD init */
void lcd_init_device(void)
{
MPARK = 0x81; /* PARK[1,0]=10 + BCR24BIT */
DSR1 = 1;
/* GPO46 is LCD RESET */
or_l(0x00004000, &GPIO1_OUT);
or_l(0x00004000, &GPIO1_ENABLE);