tx3912fb.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:13k
- /*
- * 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/config.h>
- #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 <video/fbcon.h>
- #include <video/fbcon-mfb.h>
- #include <video/fbcon-cfb2.h>
- #include <video/fbcon-cfb4.h>
- #include <video/fbcon-cfb8.h>
- #include <asm/io.h>
- #include <asm/bootinfo.h>
- #include <asm/uaccess.h>
- #include <asm/tx3912.h>
- #include "tx3912fb.h"
- /*
- * Frame buffer, palette and console structures
- */
- static struct fb_info fb_info;
- static struct { u_char red, green, blue, pad; } palette[256];
- #ifdef FBCON_HAS_CFB8
- static union { u16 cfb8[16]; } fbcon_cmap;
- #endif
- static struct display global_disp;
- static int currcon = 0;
- /*
- * Interface used by the world
- */
- static int tx3912fb_get_fix(struct fb_fix_screeninfo *fix, int con,
- struct fb_info *info);
- static int tx3912fb_get_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info);
- static int tx3912fb_set_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info);
- static int tx3912fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info);
- static int tx3912fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info);
- static int tx3912fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
- u_long arg, int con, struct fb_info *info);
- /*
- * Interface used by console driver
- */
- int tx3912fb_init(void);
- static int tx3912fbcon_switch(int con, struct fb_info *info);
- static int tx3912fbcon_updatevar(int con, struct fb_info *info);
- static void tx3912fbcon_blank(int blank, struct fb_info *info);
- /*
- * Macros
- */
- #define get_line_length(xres_virtual, bpp)
- (u_long) (((int) xres_virtual * (int) bpp + 7) >> 3)
- /*
- * Internal routines
- */
- static int tx3912fb_getcolreg(u_int regno, u_int *red, u_int *green,
- u_int *blue, u_int *transp, struct fb_info *info);
- static int tx3912fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
- u_int transp, struct fb_info *info);
- static void tx3912fb_install_cmap(int con, struct fb_info *info);
- /*
- * Frame buffer operations structure used by console driver
- */
- static struct fb_ops tx3912fb_ops = {
- owner: THIS_MODULE,
- fb_get_fix: tx3912fb_get_fix,
- fb_get_var: tx3912fb_get_var,
- fb_set_var: tx3912fb_set_var,
- fb_get_cmap: tx3912fb_get_cmap,
- fb_set_cmap: tx3912fb_set_cmap,
- fb_ioctl: tx3912fb_ioctl,
- };
- /*
- * Get fixed display data
- */
- static int tx3912fb_get_fix(struct fb_fix_screeninfo *fix, int con,
- struct fb_info *info)
- {
- struct display *display;
- memset(fix, 0, sizeof(struct fb_fix_screeninfo));
- strcpy(fix->id, TX3912FB_NAME);
- if (con == -1)
- display = &global_disp;
- else
- display = &fb_display[con];
- fix->smem_start = tx3912fb_vaddr;
- fix->smem_len = tx3912fb_size;
- fix->type = display->type;
- fix->type_aux = display->type_aux;
- fix->xpanstep = 0;
- fix->ypanstep = display->ypanstep;
- fix->ywrapstep = display->ywrapstep;
- fix->visual = display->visual;
- fix->line_length = display->line_length;
- fix->accel = FB_ACCEL_NONE;
- return 0;
- }
- /*
- * Get user display data
- */
- static int tx3912fb_get_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
- {
- if (con == -1)
- *var = tx3912fb_info;
- else
- *var = fb_display[con].var;
- return 0;
- }
- /*
- * Set user display data
- */
- static int tx3912fb_set_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
- {
- int err, activate = var->activate;
- int oldxres, oldyres, oldvxres, oldvyres, oldbpp;
- u_long line_length;
- struct display *display;
- if (con == -1)
- display = &global_disp;
- else
- display = &fb_display[con];
- /*
- * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal
- * as FB_VMODE_SMOOTH_XPAN is only used internally
- */
- if (var->vmode & FB_VMODE_CONUPDATE) {
- var->xoffset = display->var.xoffset;
- var->yoffset = display->var.yoffset;
- var->vmode |= FB_VMODE_YWRAP;
- }
- /*
- * Make sure values are in range
- */
- if (!var->xres)
- var->xres = 1;
- if (!var->yres)
- var->yres = 1;
- if (var->xres > var->xres_virtual)
- var->xres_virtual = var->xres;
- if (var->yres > var->yres_virtual)
- var->yres_virtual = var->yres;
- if (var->bits_per_pixel <= 1)
- var->bits_per_pixel = 1;
- else if (var->bits_per_pixel <= 2)
- var->bits_per_pixel = 2;
- else if (var->bits_per_pixel <= 4)
- var->bits_per_pixel = 4;
- else if (var->bits_per_pixel <= 8)
- var->bits_per_pixel = 8;
- else
- return -EINVAL;
- /*
- * Memory limit
- */
- line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
- if ((line_length * var->yres_virtual) > tx3912fb_size)
- return -ENOMEM;
- /*
- * This is only for color and we only support 8-bit color
- */
- if (var->bits_per_pixel) {
- /* RGB 332 */
- var->red.offset = 5;
- var->red.length = 3;
- var->green.offset = 2;
- var->green.length = 3;
- var->blue.offset = 0;
- var->blue.length = 2;
- var->transp.offset = 0;
- var->transp.length = 0;
- }
- var->red.msb_right = 0;
- var->green.msb_right = 0;
- var->blue.msb_right = 0;
- var->transp.msb_right = 0;
- /*
- * Make changes if necessary
- */
- if ((activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
- oldxres = display->var.xres;
- oldyres = display->var.yres;
- oldvxres = display->var.xres_virtual;
- oldvyres = display->var.yres_virtual;
- oldbpp = display->var.bits_per_pixel;
- display->var = *var;
- if (oldxres != var->xres || oldyres != var->yres ||
- oldvxres != var->xres_virtual ||
- oldvyres != var->yres_virtual ||
- oldbpp != var->bits_per_pixel) {
- display->screen_base = (u_char *) tx3912fb_vaddr;
- switch (var->bits_per_pixel) {
- case 1:
- display->visual = FB_VISUAL_MONO10;
- break;
- case 2:
- display->visual = FB_VISUAL_PSEUDOCOLOR;
- case 4:
- case 8:
- display->visual = FB_VISUAL_TRUECOLOR;
- break;
- }
- display->type = FB_TYPE_PACKED_PIXELS;
- display->type_aux = 0;
- display->ypanstep = 0;
- display->ywrapstep = 0;
- display->next_line =
- display->line_length =
- get_line_length(var->xres_virtual,
- var->bits_per_pixel);
- display->can_soft_blank = 0;
- display->inverse = FB_IS_INVERSE;
- switch (var->bits_per_pixel) {
- #ifdef CONFIG_FBCON_MFB
- case 1:
- display->dispsw = &fbcon_mfb;
- break;
- #endif
- #ifdef CONFIG_FBCON_CFB2
- case 2:
- display->dispsw = &fbcon_cfb2;
- break;
- #endif
- #ifdef CONFIG_FBCON_CFB4
- case 4:
- display->dispsw = &fbcon_cfb4;
- break;
- #endif
- #ifdef CONFIG_FBCON_CFB8
- case 8:
- display->dispsw = &fbcon_cfb8;
- display->dispsw_data = fbcon_cmap.cfb8;
- break;
- #endif
- default:
- display->dispsw = &fbcon_dummy;
- break;
- }
- if (fb_info.changevar)
- (*fb_info.changevar)(con);
- }
- if (oldbpp != var->bits_per_pixel) {
- if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
- return err;
- tx3912fb_install_cmap(con, info);
- }
- }
- return 0;
- }
- /*
- * Get the colormap
- */
- static int tx3912fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
- {
- if (con == currcon)
- return fb_get_cmap(cmap, kspc, tx3912fb_getcolreg, info);
- else if (fb_display[con].cmap.len) /* non default colormap? */
- fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
- else
- fb_copy_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel), cmap, kspc ? 0 : 2);
- return 0;
- }
- /*
- * Set the Colormap
- */
- static int tx3912fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
- {
- int err;
- if (!fb_display[con].cmap.len)
- if ((err = fb_alloc_cmap(&fb_display[con].cmap,
- 1<<fb_display[con].var.bits_per_pixel, 0)))
- return err;
- if (con == currcon)
- return fb_set_cmap(cmap, kspc, tx3912fb_setcolreg, info);
- else
- fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
- return 0;
- }
- /*
- * Framebuffer ioctl
- */
- static int tx3912fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
- u_long arg, int con, struct fb_info *info)
- {
- return -EINVAL;
- }
- /*
- * Initialization of the framebuffer
- */
- int __init tx3912fb_init(void)
- {
- /* 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_size + 1), TX3912_VIDEO_CTRL4);
- /* Set the pixel depth */
- switch (tx3912fb_info.bits_per_pixel) {
- case 1:
- /* Monochrome */
- outl(inl(TX3912_VIDEO_CTRL1) & ~TX3912_VIDEO_CTRL1_BITSEL_MASK,
- TX3912_VIDEO_CTRL1);
- 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);
- 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);
- 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);
- 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_vaddr, 0xff, tx3912fb_size);
- udelay(200);
- /* Enable the video logic */
- outl(inl(TX3912_VIDEO_CTRL1) |
- (TX3912_VIDEO_CTRL1_ENVID | TX3912_VIDEO_CTRL1_DISPON),
- TX3912_VIDEO_CTRL1);
- strcpy(fb_info.modename, TX3912FB_NAME);
- fb_info.changevar = NULL;
- fb_info.node = -1;
- fb_info.fbops = &tx3912fb_ops;
- fb_info.disp = &global_disp;
- fb_info.switch_con = &tx3912fbcon_switch;
- fb_info.updatevar = &tx3912fbcon_updatevar;
- fb_info.blank = &tx3912fbcon_blank;
- fb_info.flags = FBINFO_FLAG_DEFAULT;
- tx3912fb_set_var(&tx3912fb_info, -1, &fb_info);
- if (register_framebuffer(&fb_info) < 0)
- return -1;
- printk (KERN_INFO "fb%d: TX3912 frame buffer using %uKB.n",
- GET_FB_IDX(fb_info.node), (u_int) (tx3912fb_size >> 10));
- return 0;
- }
- /*
- * Switch the console to be the framebuffer
- */
- static int tx3912fbcon_switch(int con, struct fb_info *info)
- {
- /* Save off the color map if needed */
- if (fb_display[currcon].cmap.len)
- fb_get_cmap(&fb_display[currcon].cmap, 1,
- tx3912fb_getcolreg, info);
- /* Make the switch */
- currcon = con;
- /* Install new colormap */
- tx3912fb_install_cmap(con, info);
- return 0;
- }
- /*
- * Update variable structure
- */
- static int tx3912fbcon_updatevar(int con, struct fb_info *info)
- {
- /* Nothing */
- return 0;
- }
- /*
- * Blank the display
- */
- static void tx3912fbcon_blank(int blank, struct fb_info *info)
- {
- /* FIXME */
- printk("tx3912fbcon_blankn");
- }
- /*
- * Read a single color register
- */
- static int tx3912fb_getcolreg(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 FB_IS_GREY
- {
- u_int grey;
-
- grey = regno * 255 / 15;
- #if FB_IS_INVERSE
- grey ^= 255;
- #endif
- grey |= grey << 8;
- *red = grey;
- *green = grey;
- *blue = grey;
- }
- #else
- *red = (palette[regno].red<<8) | palette[regno].red;
- *green = (palette[regno].green<<8) | palette[regno].green;
- *blue = (palette[regno].blue<<8) | palette[regno].blue;
- #endif
- *transp = 0;
- return 0;
- }
- /*
- * 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;
- #ifdef FBCON_HAS_CFB8
- if( regno < 16 )
- fbcon_cmap.cfb8[regno] = ((red & 0xe000) >> 8)
- | ((green & 0xe000) >> 11)
- | ((blue & 0xc000) >> 14);
- #endif
- red >>= 8;
- green >>= 8;
- blue >>= 8;
- palette[regno].red = red;
- palette[regno].green = green;
- palette[regno].blue = blue;
- return 0;
- }
- /*
- * Install the color map
- */
- static void tx3912fb_install_cmap(int con, struct fb_info *info)
- {
- if (con != currcon)
- return;
- if (fb_display[con].cmap.len)
- fb_set_cmap(&fb_display[con].cmap, 1, tx3912fb_setcolreg, info);
- else
- fb_set_cmap(fb_default_cmap(1 << fb_display[con].var.bits_per_pixel), 1, tx3912fb_setcolreg, info);
- }
- MODULE_LICENSE("GPL");