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linux/drivers/video/tx3912fb.c

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/*
* drivers/video/tx3912fb.c
*
* Copyright (C) 1999 Harald Koerfgen
* Copyright (C) 2001 Steven Hill (sjhill@realitydiluted.com)
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
* Framebuffer for LCD controller in TMPR3912/05 and PR31700 processors
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/fb.h>
#include <asm/io.h>
#include <asm/bootinfo.h>
#include <asm/uaccess.h>
#include <asm/tx3912.h>
#include <video/tx3912.h>
/*
* Frame buffer, palette and console structures
*/
static struct fb_info fb_info;
static u32 cfb8[16];
static struct fb_fix_screeninfo tx3912fb_fix __initdata = {
.id = "tx3912fb",
.smem_len = ((240 * 320)/2),
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_TRUECOLOR,
.xpanstep = 1,
.ypanstep = 1,
.ywrapstep = 1,
.accel = FB_ACCEL_NONE,
};
static struct fb_var_screeninfo tx3912fb_var = {
.xres = 240,
.yres = 320,
.xres_virtual = 240,
.yres_virtual = 320,
.bits_per_pixel =4,
.red = { 0, 4, 0 }, /* ??? */
.green = { 0, 4, 0 },
.blue = { 0, 4, 0 },
.activate = FB_ACTIVATE_NOW,
.width = -1,
.height = -1,
.pixclock = 20000,
.left_margin = 64,
.right_margin = 64,
.upper_margin = 32,
.lower_margin = 32,
.hsync_len = 64,
.vsync_len = 2,
.vmode = FB_VMODE_NONINTERLACED,
};
/*
* Interface used by the world
*/
int tx3912fb_init(void);
static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green,
u_int blue, u_int transp,
struct fb_info *info);
/*
* Macros
*/
#define get_line_length(xres_virtual, bpp) \
(u_long) (((int) xres_virtual * (int) bpp + 7) >> 3)
/*
* Frame buffer operations structure used by console driver
*/
static struct fb_ops tx3912fb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = tx3912fb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int tx3912fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
/*
* Memory limit
*/
line_length =
get_line_length(var->xres_virtual, var->bits_per_pixel);
if ((line_length * var->yres_virtual) > info->fix.smem_len)
return -ENOMEM;
return 0;
}
static int tx3912fb_set_par(struct fb_info *info)
{
u_long tx3912fb_paddr = 0;
/* Disable the video logic */
outl(inl(TX3912_VIDEO_CTRL1) &
~(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
TX3912_VIDEO_CTRL1);
udelay(200);
/* Set start address for DMA transfer */
outl(tx3912fb_paddr, TX3912_VIDEO_CTRL3);
/* Set end address for DMA transfer */
outl((tx3912fb_paddr + tx3912fb_fix.smem_len + 1), TX3912_VIDEO_CTRL4);
/* Set the pixel depth */
switch (info->var.bits_per_pixel) {
case 1:
/* Monochrome */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
info->fix.visual = FB_VISUAL_MONO10;
break;
case 4:
/* 4-bit gray */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
outl(inl(TX3912_VIDEO_CTRL1) |
TX3912_VIDEO_CTRL1_BITSEL_4BIT_GRAY,
TX3912_VIDEO_CTRL1);
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 8:
/* 8-bit color */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
outl(inl(TX3912_VIDEO_CTRL1) |
TX3912_VIDEO_CTRL1_BITSEL_8BIT_COLOR,
TX3912_VIDEO_CTRL1);
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 2:
default:
/* 2-bit gray */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
outl(inl(TX3912_VIDEO_CTRL1) |
TX3912_VIDEO_CTRL1_BITSEL_2BIT_GRAY,
TX3912_VIDEO_CTRL1);
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
}
/* Enable the video clock */
outl(inl(TX3912_CLK_CTRL) | TX3912_CLK_CTRL_ENVIDCLK,
TX3912_CLK_CTRL);
/* Unfreeze video logic and enable DF toggle */
outl(inl(TX3912_VIDEO_CTRL1) &
~(TX3912_VIDEO_CTRL1_ENFREEZEFRAME |
TX3912_VIDEO_CTRL1_DFMODE)
, TX3912_VIDEO_CTRL1);
udelay(200);
/* Enable the video logic */
outl(inl(TX3912_VIDEO_CTRL1) |
(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
TX3912_VIDEO_CTRL1);
info->fix.line_length = get_line_length(var->xres_virtual,
var->bits_per_pixel);
}
/*
* Set a single color register
*/
static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green,
u_int blue, u_int transp,
struct fb_info *info)
{
if (regno > 255)
return 1;
if (regno < 16)
((u32 *)(info->pseudo_palette))[regno] = ((red & 0xe000) >> 8)
| ((green & 0xe000) >> 11)
| ((blue & 0xc000) >> 14);
return 0;
}
int __init tx3912fb_setup(char *options);
/*
* Initialization of the framebuffer
*/
int __init tx3912fb_init(void)
{
u_long tx3912fb_paddr = 0;
int size = (info->var.bits_per_pixel == 8) ? 256 : 16;
char *option = NULL;
if (fb_get_options("tx3912fb", &option))
return -ENODEV;
tx3912fb_setup(option);
/* Disable the video logic */
outl(inl(TX3912_VIDEO_CTRL1) &
~(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
TX3912_VIDEO_CTRL1);
udelay(200);
/* Set start address for DMA transfer */
outl(tx3912fb_paddr, TX3912_VIDEO_CTRL3);
/* Set end address for DMA transfer */
outl((tx3912fb_paddr + tx3912fb_fix.smem_len + 1), TX3912_VIDEO_CTRL4);
/* Set the pixel depth */
switch (tx3912fb_var.bits_per_pixel) {
case 1:
/* Monochrome */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
tx3912fb_fix.visual = FB_VISUAL_MONO10;
break;
case 4:
/* 4-bit gray */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
outl(inl(TX3912_VIDEO_CTRL1) |
TX3912_VIDEO_CTRL1_BITSEL_4BIT_GRAY,
TX3912_VIDEO_CTRL1);
tx3912fb_fix.visual = FB_VISUAL_TRUECOLOR;
tx3912fb_fix.grayscale = 1;
break;
case 8:
/* 8-bit color */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
outl(inl(TX3912_VIDEO_CTRL1) |
TX3912_VIDEO_CTRL1_BITSEL_8BIT_COLOR,
TX3912_VIDEO_CTRL1);
tx3912fb_fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 2:
default:
/* 2-bit gray */
outl(inl(TX3912_VIDEO_CTRL1) &
~TX3912_VIDEO_CTRL1_BITSEL_MASK, TX3912_VIDEO_CTRL1);
outl(inl(TX3912_VIDEO_CTRL1) |
TX3912_VIDEO_CTRL1_BITSEL_2BIT_GRAY,
TX3912_VIDEO_CTRL1);
tx3912fb_fix.visual = FB_VISUAL_PSEUDOCOLOR;
tx3912fb_fix.grayscale = 1;
break;
}
/* Enable the video clock */
outl(inl(TX3912_CLK_CTRL) | TX3912_CLK_CTRL_ENVIDCLK,
TX3912_CLK_CTRL);
/* Unfreeze video logic and enable DF toggle */
outl(inl(TX3912_VIDEO_CTRL1) &
~(TX3912_VIDEO_CTRL1_ENFREEZEFRAME | TX3912_VIDEO_CTRL1_DFMODE),
TX3912_VIDEO_CTRL1);
udelay(200);
/* Clear the framebuffer */
memset((void *) tx3912fb_fix.smem_start, 0xff, tx3912fb_fix.smem_len);
udelay(200);
/* Enable the video logic */
outl(inl(TX3912_VIDEO_CTRL1) |
(TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
TX3912_VIDEO_CTRL1);
/*
* Memory limit
*/
tx3912fb_fix.line_length =
get_line_length(tx3912fb_var.xres_virtual, tx3912fb_var.bits_per_pixel);
if ((tx3912fb_fix.line_length * tx3912fb_var.yres_virtual) > tx3912fb_fix.smem_len)
return -ENOMEM;
fb_info.fbops = &tx3912fb_ops;
fb_info.var = tx3912fb_var;
fb_info.fix = tx3912fb_fix;
fb_info.pseudo_palette = pseudo_palette;
fb_info.flags = FBINFO_DEFAULT;
/* Clear the framebuffer */
memset((void *) fb_info.fix.smem_start, 0xff, fb_info.fix.smem_len);
udelay(200);
fb_alloc_cmap(&info->cmap, size, 0);
if (register_framebuffer(&fb_info) < 0)
return -1;
printk(KERN_INFO "fb%d: TX3912 frame buffer using %uKB.\n",
fb_info.node, (u_int) (fb_info.fix.smem_len >> 10));
return 0;
}
int __init tx3912fb_setup(char *options)
{
char *this_opt;
if (!options || !*options)
return 0;
while ((this_opt = strsep(&options, ","))) {
if (!strncmp(options, "bpp:", 4))
tx3912fb_var.bits_per_pixel = simple_strtoul(options+4, NULL, 0);
}
return 0;
}
module_init(tx3912fb_init);
MODULE_LICENSE("GPL");
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