au1100fb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

		p_lcd_reg->lcd_control &= ~LCD_CONTROL_GO;
#endif
		au_sync();
		break;
	default: 
		break;

	}
	return 0;
}

static void au1100_set_disp(const void *unused, struct display *disp,
			 struct fb_info_gen *info)
{
	disp->screen_base = (char *)fb_info.fb_virt_start;

	switch (disp->var.bits_per_pixel) {
#ifdef FBCON_HAS_CFB8
	case 8:
		disp->dispsw = &fbcon_cfb8;
		if (fb_info.nohwcursor)
			fbcon_cfb8.cursor = au1100_nocursor;
		break;
#endif
#ifdef FBCON_HAS_CFB16
	case 16:
		disp->dispsw = &fbcon_cfb16;
		disp->dispsw_data = fb_info.fbcon_cmap16;
		if (fb_info.nohwcursor)
			fbcon_cfb16.cursor = au1100_nocursor;
		break;
#endif
	default:
		disp->dispsw = &fbcon_dummy;
		disp->dispsw_data = NULL;
		break;
	}
}

static int
au1100fb_mmap(struct fb_info *_fb,
	     struct file *file,
	     struct vm_area_struct *vma)
{
	unsigned int len;
	unsigned long start=0, off;
	struct au1100fb_info *fb = (struct au1100fb_info *)_fb;

	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
		return -EINVAL;
	}
    
	start = fb_info.fb_phys & PAGE_MASK;
	len = PAGE_ALIGN((start & ~PAGE_MASK) + fb_info.fb_size);

	off = vma->vm_pgoff << PAGE_SHIFT;

	if ((vma->vm_end - vma->vm_start + off) > len) {
		return -EINVAL;
	}

	off += start;
	vma->vm_pgoff = off >> PAGE_SHIFT;

	pgprot_val(vma->vm_page_prot) &= ~_CACHE_MASK;
	//pgprot_val(vma->vm_page_prot) |= _CACHE_CACHABLE_NONCOHERENT;
	pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6

	/* This is an IO map - tell maydump to skip this VMA */
	vma->vm_flags |= VM_IO;
    
	if (io_remap_page_range(vma->vm_start, off,
				vma->vm_end - vma->vm_start,
				vma->vm_page_prot)) {
		return -EAGAIN;
	}

	fb->mmaped = 1;
	return 0;
}

int au1100_pan_display(const struct fb_var_screeninfo *var,
		       struct fb_info_gen *info)
{
	return 0;
}

static int au1100fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
			  u_long arg, int con, struct fb_info *info)
{
	/* nothing to do yet */
	return -EINVAL;
}

static struct fbgen_hwswitch au1100_switch = {
	au1100_detect, 
	au1100_encode_fix, 
	au1100_decode_var, 
	au1100_encode_var, 
	au1100_get_par, 
	au1100_set_par, 
	au1100_getcolreg, 
	au1100_setcolreg, 
	au1100_pan_display, 
	au1100_blank, 
	au1100_set_disp
};


int au1100_setmode(void) 
{
	int words;

	/* FIXME Need to accomodate for swivel mode and 12bpp, <8bpp*/
	switch (p_lcd->mode_control & LCD_CONTROL_SM)
	{
		case LCD_CONTROL_SM_0:
		case LCD_CONTROL_SM_180:
		words = (p_lcd->xres * p_lcd->yres * p_lcd->bpp) / 32;
			break;
		case LCD_CONTROL_SM_90:
		case LCD_CONTROL_SM_270:
			/* is this correct? */
		words = (p_lcd->xres * p_lcd->bpp) / 8;
			break;
		default:
			printk("mode_control reg not initialized\n");
			return -EINVAL;
	}

	/*
	 * Setup LCD controller
	 */

	p_lcd_reg->lcd_control = p_lcd->mode_control;
	p_lcd_reg->lcd_intstatus = 0;
	p_lcd_reg->lcd_intenable = 0;
	p_lcd_reg->lcd_horztiming = p_lcd->mode_horztiming;
	p_lcd_reg->lcd_verttiming = p_lcd->mode_verttiming;
	p_lcd_reg->lcd_clkcontrol = p_lcd->mode_clkcontrol;
	p_lcd_reg->lcd_words = words - 1;
	p_lcd_reg->lcd_dmaaddr0 = fb_info.fb_phys;

	/* turn on panel */
#ifdef CONFIG_MIPS_PB1100
	au_writew(au_readw(PB1100_G_CONTROL) | p_lcd->mode_backlight, 
			PB1100_G_CONTROL);
#endif
	p_lcd_reg->lcd_control |= LCD_CONTROL_GO;

	return 0;
}


int __init au1100fb_init(void)
{
	uint32 sys_clksrc;
	unsigned long page;

	/*
	* Get the panel information/display mode and update the registry
	*/
	p_lcd = &panels[my_lcd_index];

	switch (p_lcd->mode_control & LCD_CONTROL_SM)
	{
		case LCD_CONTROL_SM_0:
		case LCD_CONTROL_SM_180:
		p_lcd->xres = 
			(p_lcd->mode_horztiming & LCD_HORZTIMING_PPL) + 1;
		p_lcd->yres = 
			(p_lcd->mode_verttiming & LCD_VERTTIMING_LPP) + 1;
			break;
		case LCD_CONTROL_SM_90:
		case LCD_CONTROL_SM_270:
		p_lcd->yres = 
			(p_lcd->mode_horztiming & LCD_HORZTIMING_PPL) + 1;
		p_lcd->xres = 
			(p_lcd->mode_verttiming & LCD_VERTTIMING_LPP) + 1;
			break;
	}

	/*
	 * Panel dimensions x bpp must be divisible by 32
	 */
	if (((p_lcd->yres * p_lcd->bpp) % 32) != 0) 
		printk("VERT %% 32\n");
	if (((p_lcd->xres * p_lcd->bpp) % 32) != 0) 
		printk("HORZ %% 32\n");

	/*
	 * Allocate LCD framebuffer from system memory
	 */
	fb_info.fb_size = (p_lcd->xres * p_lcd->yres * p_lcd->bpp) / 8;
	
	current_par.var.xres = p_lcd->xres;
	current_par.var.xres_virtual = p_lcd->xres;
	current_par.var.yres = p_lcd->yres;
	current_par.var.yres_virtual = p_lcd->yres;
	current_par.var.bits_per_pixel = p_lcd->bpp;

	/* FIX!!! only works for 8/16 bpp */
	current_par.line_length = p_lcd->xres * p_lcd->bpp / 8; /* in bytes */
	fb_info.fb_virt_start = (unsigned long )
		__get_free_pages(GFP_ATOMIC | GFP_DMA, 
				get_order(fb_info.fb_size + 0x1000));
	if (!fb_info.fb_virt_start) {
		printk("Unable to allocate fb memory\n");
		return -ENOMEM;
	}
	fb_info.fb_phys = virt_to_bus((void *)fb_info.fb_virt_start);

	/*
	 * Set page reserved so that mmap will work. This is necessary
	 * since we'll be remapping normal memory.
	 */
	for (page = fb_info.fb_virt_start;
	     page < PAGE_ALIGN(fb_info.fb_virt_start + fb_info.fb_size); 
	     page += PAGE_SIZE) {
		SetPageReserved(virt_to_page(page));
	}

	memset((void *)fb_info.fb_virt_start, 0, fb_info.fb_size);

	/* set freqctrl now to allow more time to stabilize */
	/* zero-out out LCD bits */
	sys_clksrc = au_readl(SYS_CLKSRC) & ~0x000003e0; 
	sys_clksrc |= p_lcd->mode_toyclksrc;
	au_writel(sys_clksrc, SYS_CLKSRC);

	/* FIXME add check to make sure auxpll is what is expected! */
	au1100_setmode();

	fb_info.gen.parsize = sizeof(struct au1100fb_par);
	fb_info.gen.fbhw = &au1100_switch;

	strcpy(fb_info.gen.info.modename, "Au1100 LCD");
	fb_info.gen.info.changevar = NULL;
	fb_info.gen.info.node = -1;

	fb_info.gen.info.fbops = &au1100fb_ops;
	fb_info.gen.info.disp = &disp;
	fb_info.gen.info.switch_con = &fbgen_switch;
	fb_info.gen.info.updatevar = &fbgen_update_var;
	fb_info.gen.info.blank = &fbgen_blank;
	fb_info.gen.info.flags = FBINFO_FLAG_DEFAULT;

	/* This should give a reasonable default video mode */
	fbgen_get_var(&disp.var, -1, &fb_info.gen.info);
	fbgen_do_set_var(&disp.var, 1, &fb_info.gen);
	fbgen_set_disp(-1, &fb_info.gen);
	fbgen_install_cmap(0, &fb_info.gen);
	if (register_framebuffer(&fb_info.gen.info) < 0)
		return -EINVAL;
	printk(KERN_INFO "fb%d: %s frame buffer device\n", 
			GET_FB_IDX(fb_info.gen.info.node), 
			fb_info.gen.info.modename);

	/* uncomment this if your driver cannot be unloaded */
	/* MOD_INC_USE_COUNT; */
	return 0;
}


void au1100fb_cleanup(struct fb_info *info)
{
	unregister_framebuffer(info);
}


void au1100fb_setup(char *options, int *ints)
{
	char* this_opt;
	int i;
	int num_panels = sizeof(panels)/sizeof(struct known_lcd_panels);

    
	if (!options || !*options)
		return;

	for(this_opt=strtok(options, ","); this_opt;
	    this_opt=strtok(NULL, ",")) {
		if (!strncmp(this_opt, "panel:", 6)) {
#if defined(CONFIG_MIPS_PB1100) || defined(CONFIG_MIPS_DB1100)
			/* Read Pb1100 Switch S10 ? */
			if (!strncmp(this_opt+6, "s10", 3))
			{
				int panel;
				panel = *(volatile int *)0xAE000008; /* BCSR SWITCHES */
				panel >>= 8;
				panel &= 0x0F;
				if (panel >= num_panels) panel = 0;
				my_lcd_index = panel;
			}
			else
#endif
			/* Get the panel name, everything else if fixed */
			for (i=0; i<num_panels; i++) {
				if (!strncmp(this_opt+6, panels[i].panel_name, 
							strlen(this_opt))) {
					my_lcd_index = i;
					break;
				}
			}
		}
		else if (!strncmp(this_opt, "nohwcursor", 10)) {
			printk("nohwcursor\n");
			fb_info.nohwcursor = 1;
		}
	} 

	printk("au1100fb: Panel %d %s\n", my_lcd_index,
		panels[my_lcd_index].panel_name);
}



#ifdef MODULE
MODULE_LICENSE("GPL");
int init_module(void)
{
	return au1100fb_init();
}

void cleanup_module(void)
{
	au1100fb_cleanup(void);
}

MODULE_AUTHOR("Pete Popov <[e-mail]>");
MODULE_DESCRIPTION("Au1100 LCD framebuffer device driver");
#endif /* MODULE */