mirror of
https://github.com/Rockbox/rockbox.git
synced 2025-12-09 13:15:18 -05:00
iPod Classic: Use DMA (and double buffering) for LCD updates
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29474 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sparmann
parent
24a6f93aa8
commit
7a7c8f071d
2 changed files with 103 additions and 134 deletions
|
|
@ -19,57 +19,15 @@
|
|||
*
|
||||
****************************************************************************/
|
||||
|
||||
#define FORCE_FIFO_WAIT
|
||||
/****************************************************************************
|
||||
* #define FORCE_FIFO_WAIT
|
||||
*
|
||||
* This is not needed in YUV blitting when the LCD IF is fast enough. In this
|
||||
* case YUV-to-RGB conversion per pixel needs longer than the transfer of a
|
||||
* pixel via the LCD IF. For iPod nano 2G this is true if the LCD IF is
|
||||
* configured to use LCD_PHTIME = 0x00 (see lcd-nano2g.c).
|
||||
****************************************************************************/
|
||||
|
||||
#include "config.h"
|
||||
|
||||
.section .icode, "ax", %progbits
|
||||
|
||||
/****************************************************************************
|
||||
* void lcd_write_line(const fb_data *addr,
|
||||
* int pixelcount,
|
||||
* const unsigned int lcd_base_addr);
|
||||
*
|
||||
* Writes pixelcount pixels from src-pointer (lcd_framebuffer) to LCD dataport.
|
||||
*/
|
||||
.align 2
|
||||
.global lcd_write_line
|
||||
.type lcd_write_line, %function
|
||||
/* r0 = addr, must be aligned */
|
||||
/* r1 = pixel count, must be even */
|
||||
lcd_write_line: /* r2 = LCD_BASE */
|
||||
stmfd sp!, {r4-r6, lr} /* save non-scratch registers */
|
||||
add r12, r2, #0x40 /* LCD_WDATA = LCD data port */
|
||||
|
||||
.loop:
|
||||
ldmia r0!, {r3, r5} /* read 2 pixel (=8 byte) */
|
||||
|
||||
/* wait for FIFO half full */
|
||||
.fifo_wait:
|
||||
ldr lr, [r2, #0x1C] /* while (LCD_STATUS & 0x08); */
|
||||
tst lr, #0x8
|
||||
bgt .fifo_wait
|
||||
|
||||
mov r4, r3, asr #16 /* r3 = 1st pixel, r4 = 2nd pixel */
|
||||
mov r6, r5, asr #16 /* r5 = 3rd pixel, r6 = 4th pixel */
|
||||
stmia r12, {r3-r6} /* write pixels (lowest 16 bit used) */
|
||||
|
||||
subs r1, r1, #4
|
||||
bgt .loop
|
||||
|
||||
ldmpc regs=r4-r6
|
||||
|
||||
/****************************************************************************
|
||||
* extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
|
||||
* const unsigned LCD_BASE,
|
||||
* uint16_t* out,
|
||||
* int width,
|
||||
* int stride);
|
||||
*
|
||||
|
|
@ -93,7 +51,7 @@ lcd_write_line: /* r2 = LCD_BASE */
|
|||
.type lcd_write_yuv420_lines, %function
|
||||
lcd_write_yuv420_lines:
|
||||
/* r0 = src = yuv_src */
|
||||
/* r1 = dst = LCD_BASE */
|
||||
/* r1 = dst = out */
|
||||
/* r2 = width */
|
||||
/* r3 = stride */
|
||||
stmfd sp!, { r4-r10, lr } /* save non-scratch */
|
||||
|
|
@ -103,14 +61,14 @@ lcd_write_yuv420_lines:
|
|||
add r3, r9, r3 /* r3 = &ysrc[stride] */
|
||||
add r4, r2, r2, asr #1 /* chroma buffer lenght = width/2 *3 */
|
||||
mov r4, r4, asl #2 /* use words for str/ldm possibility */
|
||||
add r4, r4, #19 /* plus room for 4 additional words, */
|
||||
add r4, r4, #15 /* plus room for 3 additional words, */
|
||||
bic r4, r4, #3 /* rounded up to multiples of 4 byte */
|
||||
sub sp, sp, r4 /* and allocate on stack */
|
||||
stmia sp, {r1-r4} /* LCD_BASE, width, &ysrc[stride], stack_alloc */
|
||||
stmia sp, {r2-r4} /* width, &ysrc[stride], stack_alloc */
|
||||
|
||||
mov r7, r2 /* r7 = loop count */
|
||||
add r8, sp, #16 /* chroma buffer */
|
||||
add lr, r1, #0x40 /* LCD data port = LCD_BASE + 0x40 */
|
||||
add r8, sp, #12 /* chroma buffer */
|
||||
mov lr, r1 /* RGB565 data destination buffer */
|
||||
|
||||
/* 1st loop start */
|
||||
10: /* loop start */
|
||||
|
|
@ -195,23 +153,16 @@ lcd_write_yuv420_lines:
|
|||
/* calculate pixel_2 and pack with pixel_1 before writing */
|
||||
orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
|
||||
orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
|
||||
#ifdef FORCE_FIFO_WAIT
|
||||
/* wait for FIFO half full */
|
||||
.fifo_wait1:
|
||||
ldr r3, [lr, #-0x24] /* while (LCD_STATUS & 0x08); */
|
||||
tst r3, #0x8
|
||||
bgt .fifo_wait1
|
||||
#endif
|
||||
stmia lr, {r4,r5} /* write pixel_1 and pixel_2 */
|
||||
orr r4, r4, r5, lsl #16
|
||||
str r4, [lr], #4 /* write pixel_1 and pixel_2 */
|
||||
|
||||
subs r7, r7, #2 /* check for loop end */
|
||||
bgt 10b /* back to beginning */
|
||||
/* 1st loop end */
|
||||
|
||||
/* Reload several registers for pointer rewinding for next loop */
|
||||
add r8, sp, #16 /* chroma buffer */
|
||||
ldmia sp, { r1, r7, r9} /* r1 = LCD_BASE */
|
||||
/* r7 = loop count */
|
||||
add r8, sp, #12 /* chroma buffer */
|
||||
ldmia sp, {r7, r9} /* r7 = loop count */
|
||||
/* r9 = &ysrc[stride] */
|
||||
|
||||
/* 2nd loop start */
|
||||
|
|
@ -275,20 +226,14 @@ lcd_write_yuv420_lines:
|
|||
/* calculate pixel_2 and pack with pixel_1 before writing */
|
||||
orr r5, r5, r3, lsl #5 /* pixel_2 = r<<11 | g<<5 | b */
|
||||
orr r5, r5, r6, lsl #11 /* r5 = pixel_2 */
|
||||
#ifdef FORCE_FIFO_WAIT
|
||||
/* wait for FIFO half full */
|
||||
.fifo_wait2:
|
||||
ldr r3, [lr, #-0x24] /* while (LCD_STATUS & 0x08); */
|
||||
tst r3, #0x8
|
||||
bgt .fifo_wait2
|
||||
#endif
|
||||
stmia lr, {r4,r5} /* write pixel_1 and pixel_2 */
|
||||
orr r4, r4, r5, lsl #16
|
||||
str r4, [lr], #4 /* write pixel_1 and pixel_2 */
|
||||
|
||||
subs r7, r7, #2 /* check for loop end */
|
||||
bgt 20b /* back to beginning */
|
||||
/* 2nd loop end */
|
||||
|
||||
ldr r3, [sp, #12]
|
||||
ldr r3, [sp, #8]
|
||||
add sp, sp, r3 /* deallocate buffer */
|
||||
ldmpc regs=r4-r10 /* restore registers */
|
||||
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
mutex_lock(&lcd_mutex);
|
||||
while (DMAC0C4CONFIG & 1) wakeup_wait(&lcd_wakeup, HZ / 10);
|
||||
|
||||
/* 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 */
|
||||
|
||||
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);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue