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HD200 - Use DMA transfers in lcd_update() and lcd_update_rect(). Gives 12-26% speedup.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27757 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Marcin Bukat 2010-08-08 18:41:19 +00:00
parent 33a5f1a2bb
commit a86b08e4fa
1 changed files with 87 additions and 17 deletions
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104
firmware/target/coldfire/mpio/hd200/lcd-hd200.c
View file

@ -55,6 +55,13 @@ static bool cached_invert = false;
static bool cached_flip = false;
static int cached_contrast = DEFAULT_CONTRAST_SETTING;
static struct mutex lcd_mtx; /* The update functions use DMA and yield */
volatile unsigned char page IBSS_ATTR;
unsigned char column IBSS_ATTR;
unsigned int dma_len IBSS_ATTR;
volatile unsigned long dma_count IBSS_ATTR;
/*** hardware configuration ***/
int lcd_default_contrast(void)
{
@ -155,24 +162,72 @@ void lcd_init_device(void)
lcd_set_contrast(cached_contrast);
lcd_set_invert_display(cached_invert);
/* Configure DMA3 */
DAR3 = 0xf0000002;
DSR3 = 1;
DIVR3 = 57; /* DMA3 is mapped into vector 57 in system.c */
ICR9 = (6 << 2); /* Enable DMA3 interrupt at level 6, priority 0 */
and_l(~(1<<17), &IMR);
mutex_init(&lcd_mtx);
lcd_update();
}
/* LCD DMA ISR */
void DMA3(void) __attribute__ ((interrupt_handler, section(".icode")));
void DMA3(void)
{
DSR3 = 1;
if (--dma_count > 0)
{
/* Setup write address in lcd controller ram*/
lcd_write_command(LCD_SET_PAGE | ++page);
lcd_write_command_e(LCD_SET_COLUMN | ((column >> 4) & 0xf),
column & 0x0f);
SAR3 = (unsigned long)&lcd_framebuffer[page][column];
BCR3 = dma_len;
DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
| DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
| DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;
}
}
/* Update the display.
This must be called after all other LCD functions that change the display. */
void lcd_update(void) ICODE_ATTR;
void lcd_update(void)
{
int y;
for(y = 0;y < LCD_FBHEIGHT;y++)
{
lcd_write_command(LCD_SET_PAGE | y);
lcd_write_command_e(LCD_SET_COLUMN, 0);
lcd_write_data(lcd_framebuffer[y], LCD_WIDTH);
}
mutex_lock(&lcd_mtx);
/* Setup initial address in lcd controller */
lcd_write_command(LCD_SET_PAGE | 0);
lcd_write_command_e(LCD_SET_COLUMN, 0);
/* Initial lcd ram address */
page = 0;
column = 0;
/* Number of pages to address */
dma_count = LCD_FBHEIGHT;
/* Transfer size in bytes to the given page */
dma_len = LCD_WIDTH*2;
/* Initialize DMA transfer */
SAR3 = (unsigned long)lcd_framebuffer;
BCR3 = LCD_WIDTH*2;
DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
| DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
| DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;
while (dma_count > 0)
yield();
mutex_unlock(&lcd_mtx);
}
/* Update a fraction of the display. */
@ -191,17 +246,32 @@ void lcd_update_rect(int x, int y, int width, int height)
if (width <= 0)
return; /* nothing left to do, 0 is harmful to lcd_write_data() */
mutex_lock(&lcd_mtx);
if (ymax >= LCD_FBHEIGHT)
ymax = LCD_FBHEIGHT-1;
/* Copy specified rectange bitmap to hardware */
for (; y <= ymax; y++)
{
lcd_write_command(LCD_SET_PAGE | y );
lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0x0f);
lcd_write_data (&lcd_framebuffer[y][x], width);
}
/* Initial lcd ram address*/
lcd_write_command(LCD_SET_PAGE | y );
lcd_write_command_e(LCD_SET_COLUMN | ((x >> 4) & 0xf), x & 0x0f);
page = y;
column = x;
dma_len = width*2;
dma_count = ymax - y + 1;
/* Initialize DMA transfer */
SAR3 = (unsigned long)&lcd_framebuffer[page][column];
BCR3 = dma_len;
DCR3 = DMA_INT | DMA_AA | DMA_BWC(1)
| DMA_SINC | DMA_SSIZE(DMA_SIZE_LINE)
| DMA_DSIZE(DMA_SIZE_BYTE) | DMA_START;
while (dma_count > 0)
yield();
mutex_unlock(&lcd_mtx);
}
/* Helper function. */