LCD 驱动问题
s3c2440a 的LCD测试代码运行时LCD全红
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/sizes.h>
/* lcdcon1 */
#define CLKVAL(x) ((x) << 8)
#define PNRMODE(x) ((x) << 5)
#define BPPMODE(x) ((x) << 1)
#define ENVID(x) ((x) << 0)
/* lcdcon2 */
#define VBPD(x) ((x) << 24)
#define LINEVAL(x) ((x) << 14)
#define VFPD(x) ((x) << 6)
#define VSPW(x) ((x) << 0)
/* lcdcon3 */
#define HBPD(x) ((x) << 19)
#define HOZVAL(x) ((x) << 8)
#define HFPD(x) ((x) << 0)
/* lcdcon4 */
#define HSPW(x) ((x) << 0)
/* lcdcon5 */
#define FRM565(x) ((x) << 11)
#define INVVCLK(x) ((x) << 10)
#define INVVLINE(x) ((x) << 9)
#define INVVFRAME(x) ((x) << 8)
#define INVPWREN(x) ((x) << 5)
#define PWREN(x) ((x) << 3)
#define HWSWP(x) ((x) << 0)
/* lcdsaddr1 */
#define LCDBANK(x) ((x) << 21)
#define LCDBASEU(x) ((x) << 0)
/* lcdsaddr2 */
#define LCDBASEL(x) ((x) << 0)
/* lcdsaddr3 */
#define OFFSIZE(x) ((x) << 11)
#define PAGEWIDTH(x) ((x) << 0)
#define RGB(r, g, b) ((r << 11) | ((g >> 2) << 5) | (b >> 3))
struct _lcd_t{
unsigned long phys, virt;
unsigned long lcdcon1, lcdcon2, lcdcon3, lcdcon4, lcdcon5;
unsigned long lcdsaddr1, lcdsaddr2, lcdsaddr3;
unsigned long gpio_phys, gpio_virt;
unsigned long gpbcon, gpbup, gpccon, gpcup, gpdcon, gpdup;
unsigned long fb_virt, fb_phys, fb_size;
void (*config)(struct _lcd_t *l);
void (*enable)(struct _lcd_t *l);
void (*disable)(struct _lcd_t *l);
};
static void s3c_lcd_enable(struct _lcd_t *l)
{
iowrite32(ioread32(l->lcdcon1) | ENVID(1), l->lcdcon1);
iowrite32(ioread32(l->lcdcon5) | PWREN(1), l->lcdcon5);
}
static void s3c_lcd_disable(struct _lcd_t *l)
{
iowrite32(ioread32(l->lcdcon1) & ~ENVID(1), l->lcdcon1);
iowrite32(ioread32(l->lcdcon5) & ~PWREN(1), l->lcdcon5);
}
static void s3c_lcd_config(struct _lcd_t *l)
{
unsigned int reg;
/* config gpio for lcd pin */
reg = ioread32(l->gpbcon);
reg &= ~(3 << 0);
reg |= (1 << 0);
iowrite32(reg, l->gpbcon);
iowrite32(0xf, l->gpbup);
iowrite32(0xaaaaaaaa, l->gpccon);
iowrite32(0xffff, l->gpcup);
iowrite32(0xaaaaaaaa, l->gpdcon);
iowrite32(0xffff, l->gpdup);
/* lcdcon1 */
iowrite32(CLKVAL(5) | PNRMODE(3) | BPPMODE(0xc), l->lcdcon1);
/* lcdcon2 */
iowrite32(VBPD(10) | LINEVAL(271) | VFPD(2) | VSPW(10), l->lcdcon2);
/* lcdcon3 */
iowrite32(HBPD(2) | HOZVAL(479) | HFPD(2), l->lcdcon3);
/* lcdcon4 */
iowrite32(HSPW(41), l->lcdcon4);
/* lcdcon5 */
iowrite32(FRM565(1) | INVVLINE(1) | INVVFRAME(1) | INVPWREN(1) | HWSWP(1), l->lcdcon5);
/* lcdsaddr1*/
iowrite32(LCDBANK(l->fb_phys >> 22) | (LCDBASEU((l->fb_phys >> 1) & 0x1fffff)), l->lcdsaddr1);
/* lcdsaddr2*/
iowrite32(LCDBASEL(((l->fb_phys >> 1) & 0x1fffff) + 480*272), l->lcdsaddr2);
/* lcdsaddr3*/
iowrite32(OFFSIZE(0) | PAGEWIDTH(480), l->lcdsaddr3);
}
int lcd_device_init(struct _lcd_t *l)
{
int ret;
l->phys = 0X4D000000;
l->virt = ioremap(l->phys, SZ_4K);
if(NULL == l->virt)
{
printk("iomap lcd virt failed\n");
ret = -EBUSY;
goto err;
}
l->lcdcon1 = l->virt + 0x00;
l->lcdcon2 = l->virt + 0x04;
l->lcdcon3 = l->virt + 0x08;
l->lcdcon4 = l->virt + 0x0c;
l->lcdcon5 = l->virt + 0x10;
l->lcdsaddr1 = l->virt + 0x14;
l->lcdsaddr2 = l->virt + 0x18;
l->lcdsaddr3 = l->virt + 0x1c;
l->gpio_phys = 0x56000000;
l->gpio_virt = ioremap(l->gpio_phys, SZ_4K);
if(NULL == l->gpio_virt)
{
printk("iomap gpio virt failed\n");
ret = -EBUSY;
goto err1;
}
l->gpbcon = l->gpio_virt + 0x10;
l->gpbup = l->gpio_virt + 0x18;
l->gpccon = l->gpio_virt + 0x20;
l->gpcup = l->gpio_virt + 0x28;
l->gpdcon = l->gpio_virt + 0x30;
l->gpdup = l->gpio_virt + 0x38;
l->fb_size = 272*480*2;
l->fb_virt = dma_alloc_writecombine(NULL, l->fb_size, &l->fb_phys, GFP_KERNEL);
if(NULL == l->gpio_virt)
{
printk("dma alloc failed\n");
ret = -ENOMEM;
goto err2;
}
l->config = s3c_lcd_config;
l->enable = s3c_lcd_enable;
l->disable = s3c_lcd_disable;
return 0;
err2:
iounmap(l->gpio_virt);
err1:
iounmap(l->virt);
err:
return ret;
}
void lcd_device_destory(struct _lcd_t *l)
{
dma_free_coherent(NULL, l->fb_size, l->fb_virt, l->fb_phys);
iounmap(l->gpio_virt);
iounmap(l->virt);
}
void test_lcd(struct _lcd_t *l)
{
unsigned short (*p);
int i, j;
l->config(l);
l->enable(l);
/* fill memory(framebuffer) */
p = (unsigned short *)l->fb_virt;
for(i = 0; i < 272; i++)
{
for(j = 0; j < 480; j++)
{
p = RGB(255, 0, 0);
}
}
}
struct _lcd_t *lcd;
int lcd_driver_init(void)
{
int ret;
lcd = kmalloc(sizeof(struct _lcd_t), GFP_KERNEL);
if(NULL == lcd)
{
printk("lcd alloc failed\n");
ret = -ENOMEM;
goto err;
}
printk("hello lcd\n");
ret = lcd_device_init(lcd);
if(ret){
printk("lcd device init failed\n");
ret = -EBUSY;
goto err1;
}
test_lcd(lcd);
return 0;
err1:
kfree(lcd);
err:
return ret;
}
void lcd_driver_exit(void)
{
lcd_device_destory(lcd);
kfree(lcd);
printk("[%s]\n", __FUNCTION__);
}
module_init(lcd_driver_init);
module_exit(lcd_driver_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Richard");
MODULE_VERSION("v0.1");
1. #define RGB(r, g, b) ((r << 11) | ((g >> 2) << 5) | (b >> 3))
是什么意思？具体怎么操作的呢？
2. iowrite32(LCDBANK(l->fb_phys >> 22) | (LCDBASEU((l->fb_phys >> 1) & 0x1fffff)), l->lcdsaddr1);
>>22和>>1 是做什么的？怎么移位的？ 为毛代码上蹦出那么多表情啊？？？ 添加代码时选用“CODE” 标签，如下：
[ /code]
printf("hello world");
#define RGB(r, g, b) ((r << 11) | ((g >> 2) << 5) | (b >> 3))
设置三种基色 iowrite32(LCDBANK(l->fb_phys >> 22) | (LCDBASEU((l->fb_phys >> 1) & 0x1fffff)), l->lcdsaddr1);
这句请参考你的LCD的datasheet 看不懂代码搜索s3c2440 lcd 移植 等关键字。
然后再读读s3c2440 lcd 那一章。
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