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iPod Classic: Use DMA (and double buffering) for LCD updates

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29474 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sparmann 2011-03-01 01:52:12 +00:00
parent 24a6f93aa8
commit 7a7c8f071d
2 changed files with 103 additions and 134 deletions
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156
firmware/target/arm/s5l8702/ipod6g/lcd-ipod6g.c
View file

@ -27,6 +27,7 @@
#include "cpu.h"
#include "pmu-target.h"
#include "power.h"
#include "string.h"
#define R_HORIZ_GRAM_ADDR_SET 0x200
@ -48,6 +49,10 @@
/** globals **/
int lcd_type; /* also needed in debug-s5l8702.c */
static struct dma_lli lcd_lli[(LCD_WIDTH * LCD_HEIGHT - 1) / 0xfff] CACHEALIGN_ATTR;
static struct wakeup lcd_wakeup;
static struct mutex lcd_mutex;
static uint16_t lcd_dblbuf[LCD_HEIGHT][LCD_WIDTH];
static inline void s5l_lcd_write_cmd_data(int cmd, int data)
@ -100,6 +105,7 @@ bool lcd_active(void)
void lcd_shutdown(void)
{
mutex_lock(&lcd_mutex);
pmu_write(0x2b, 0); /* Kill the backlight, instantly. */
pmu_write(0x29, 0);
@ -131,6 +137,7 @@ void lcd_shutdown(void)
s5l_lcd_write_cmd(0x10);
sleep(HZ / 20);
}
mutex_unlock(&lcd_mutex);
}
void lcd_sleep(void)
@ -142,6 +149,8 @@ void lcd_sleep(void)
void lcd_init_device(void)
{
/* Detect lcd type */
wakeup_init(&lcd_wakeup);
mutex_init(&lcd_mutex);
lcd_type = (PDAT6 & 0x30) >> 4;
}
@ -149,7 +158,9 @@ void lcd_init_device(void)
static inline void lcd_write_pixel(fb_data pixel)
{
mutex_lock(&lcd_mutex);
LCD_WDATA = pixel;
mutex_unlock(&lcd_mutex);
}
/* Update the display.
@ -165,121 +176,134 @@ extern void lcd_write_line(const fb_data *addr,
int pixelcount,
const unsigned int lcd_base_addr);
/* Update a fraction of the display. */
void lcd_update_rect(int, int, int, int) ICODE_ATTR;
void lcd_update_rect(int x, int y, int width, int height)
static void displaylcd_setup(int x, int y, int width, int height) ICODE_ATTR;
static void displaylcd_setup(int x, int y, int width, int height)
{
int y0, x0, y1, x1;
fb_data* p;
/* Both x and width need to be preprocessed due to asm optimizations */
x = x & ~1; /* ensure x is even */
width = (width + 3) & ~3; /* ensure width is a multiple of 4 */
mutex_lock(&lcd_mutex);
while (DMAC0C4CONFIG & 1) wakeup_wait(&lcd_wakeup, HZ / 10);
x0 = x; /* start horiz */
y0 = y; /* start vert */
x1 = (x + width) - 1; /* max horiz */
y1 = (y + height) - 1; /* max vert */
int xe = (x + width) - 1; /* max horiz */
int ye = (y + height) - 1; /* max vert */
if (lcd_type & 2) {
s5l_lcd_write_cmd_data(R_HORIZ_ADDR_START_POS, x0);
s5l_lcd_write_cmd_data(R_HORIZ_ADDR_END_POS, x1);
s5l_lcd_write_cmd_data(R_VERT_ADDR_START_POS, y0);
s5l_lcd_write_cmd_data(R_VERT_ADDR_END_POS, y1);
s5l_lcd_write_cmd_data(R_HORIZ_ADDR_START_POS, x);
s5l_lcd_write_cmd_data(R_HORIZ_ADDR_END_POS, xe);
s5l_lcd_write_cmd_data(R_VERT_ADDR_START_POS, y);
s5l_lcd_write_cmd_data(R_VERT_ADDR_END_POS, ye);
s5l_lcd_write_cmd_data(R_HORIZ_GRAM_ADDR_SET, x0);
s5l_lcd_write_cmd_data(R_VERT_GRAM_ADDR_SET, y0);
s5l_lcd_write_cmd_data(R_HORIZ_GRAM_ADDR_SET, x);
s5l_lcd_write_cmd_data(R_VERT_GRAM_ADDR_SET, y);
s5l_lcd_write_cmd(R_WRITE_DATA_TO_GRAM);
} else {
s5l_lcd_write_cmd(R_COLUMN_ADDR_SET);
s5l_lcd_write_data(x0 >> 8);
s5l_lcd_write_data(x0 & 0xff);
s5l_lcd_write_data(x1 >> 8);
s5l_lcd_write_data(x1 & 0xff);
s5l_lcd_write_data(x >> 8);
s5l_lcd_write_data(x & 0xff);
s5l_lcd_write_data(xe >> 8);
s5l_lcd_write_data(xe & 0xff);
s5l_lcd_write_cmd(R_ROW_ADDR_SET);
s5l_lcd_write_data(y0 >> 8);
s5l_lcd_write_data(y0 & 0xff);
s5l_lcd_write_data(y1 >> 8);
s5l_lcd_write_data(y1 & 0xff);
s5l_lcd_write_data(y >> 8);
s5l_lcd_write_data(y & 0xff);
s5l_lcd_write_data(ye >> 8);
s5l_lcd_write_data(ye & 0xff);
s5l_lcd_write_cmd(R_MEMORY_WRITE);
}
}
static void displaylcd_dma(int pixels) ICODE_ATTR;
static void displaylcd_dma(int pixels)
{
int i;
void* data = lcd_dblbuf;
for (i = -1; i < (int)ARRAYLEN(lcd_lli) && pixels > 0; i++, pixels -= 0xfff)
{
bool last = i + 1 >= (int)ARRAYLEN(lcd_lli) || pixels <= 0xfff;
struct dma_lli* lli = i < 0 ? (struct dma_lli*)((int)&DMAC0C4LLI) : &lcd_lli[i];
lli->srcaddr = data;
lli->dstaddr = (void*)((int)&LCD_WDATA);
lli->nextlli = last ? NULL : &lcd_lli[i + 1];
lli->control = 0x70240000 | (last ? pixels : 0xfff)
| (last ? 0x80000000 : 0) | 0x4000000;
data += 0x1ffe;
}
clean_dcache();
DMAC0C4CONFIG = 0x88c1;
mutex_unlock(&lcd_mutex);
}
void INT_DMAC0C4(void) ICODE_ATTR;
void INT_DMAC0C4(void)
{
DMAC0INTTCCLR = 0x10;
wakeup_signal(&lcd_wakeup);
}
/* Update a fraction of the display. */
void lcd_update_rect(int, int, int, int) ICODE_ATTR;
void lcd_update_rect(int x, int y, int width, int height)
{
int pixels = width * height;
fb_data* p = &lcd_framebuffer[y][x];
uint16_t* out = lcd_dblbuf[0];
displaylcd_setup(x, y, width, height);
/* Copy display bitmap to hardware */
p = &lcd_framebuffer[y0][x0];
if (LCD_WIDTH == width) {
/* Write all lines at once */
lcd_write_line(p, height*LCD_WIDTH, LCD_BASE);
memcpy(out, p, pixels * 2);
} else {
y1 = height;
do {
/* Write a single line */
lcd_write_line(p, width, LCD_BASE);
memcpy(out, p, width * 2);
p += LCD_WIDTH;
} while (--y1 > 0 );
out += width;
} while (--height);
}
displaylcd_dma(pixels);
}
/* Line write helper function for lcd_yuv_blit. Writes two lines of yuv420. */
extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
const unsigned int lcd_baseadress,
uint16_t* outbuf,
int width,
int stride);
/* Blit a YUV bitmap directly to the LCD */
void lcd_blit_yuv(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height) ICODE_ATTR;
void lcd_blit_yuv(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height)
{
unsigned int z, y0, x0, y1, x1;;
unsigned int z;
unsigned char const * yuv_src[3];
width = (width + 1) & ~1; /* ensure width is even */
x0 = x; /* start horiz */
y0 = y; /* start vert */
x1 = (x + width) - 1; /* max horiz */
y1 = (y + height) - 1; /* max vert */
if (lcd_type & 2) {
s5l_lcd_write_cmd_data(R_HORIZ_ADDR_START_POS, x0);
s5l_lcd_write_cmd_data(R_HORIZ_ADDR_END_POS, x1);
s5l_lcd_write_cmd_data(R_VERT_ADDR_START_POS, y0);
s5l_lcd_write_cmd_data(R_VERT_ADDR_END_POS, y1);
s5l_lcd_write_cmd_data(R_HORIZ_GRAM_ADDR_SET, x0);
s5l_lcd_write_cmd_data(R_VERT_GRAM_ADDR_SET, y0);
s5l_lcd_write_cmd(R_WRITE_DATA_TO_GRAM);
} else {
s5l_lcd_write_cmd(R_COLUMN_ADDR_SET);
s5l_lcd_write_data(x0 >> 8);
s5l_lcd_write_data(x0 & 0xff);
s5l_lcd_write_data(x1 >> 8);
s5l_lcd_write_data(x1 & 0xff);
s5l_lcd_write_cmd(R_ROW_ADDR_SET);
s5l_lcd_write_data(y0 >> 8);
s5l_lcd_write_data(y0 & 0xff);
s5l_lcd_write_data(y1 >> 8);
s5l_lcd_write_data(y1 & 0xff);
s5l_lcd_write_cmd(R_MEMORY_WRITE);
}
int pixels = width * height;
uint16_t* out = lcd_dblbuf[0];
z = stride * src_y;
yuv_src[0] = src[0] + z + src_x;
yuv_src[1] = src[1] + (z >> 2) + (src_x >> 1);
yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
displaylcd_setup(x, y, width, height);
height >>= 1;
do {
lcd_write_yuv420_lines(yuv_src, LCD_BASE, width, stride);
lcd_write_yuv420_lines(yuv_src, out, width, stride);
yuv_src[0] += stride << 1;
yuv_src[1] += stride >> 1; /* Skip down one chroma line */
yuv_src[2] += stride >> 1;
} while (--height > 0);
out += width << 1;
} while (--height);
displaylcd_dma(pixels);
}