clps711xfb.c
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上传日期:2013-02-24
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- /*
- * linux/drivers/video/clps711xfb.c
- *
- * Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Framebuffer driver for the CLPS7111 and EP7212 processors.
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/fb.h>
- #include <linux/init.h>
- #include <linux/proc_fs.h>
- #include <video/fbcon.h>
- #include <video/fbcon-cfb4.h>
- #include <asm/hardware.h>
- #include <asm/mach-types.h>
- #include <asm/uaccess.h>
- #include <asm/hardware/clps7111.h>
- #include <asm/arch/syspld.h>
- static struct clps7111fb_info {
- struct fb_info fb;
- int currcon;
- } *cfb;
- #define CMAP_SIZE 16
- /* The /proc entry for the backlight. */
- static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL;
- static int clps7111fb_proc_backlight_read(char *page, char **start, off_t off,
- int count, int *eof, void *data);
- static int clps7111fb_proc_backlight_write(struct file *file,
- const char *buffer, unsigned long count, void *data);
- /*
- * Set a single color register. Return != 0 for invalid regno.
- */
- static int
- clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
- u_int transp, struct fb_info *info)
- {
- unsigned int level, mask, shift, pal;
- if (regno >= CMAP_SIZE)
- return 1;
- /* gray = 0.30*R + 0.58*G + 0.11*B */
- level = (red * 77 + green * 151 + blue * 28) >> 20;
- /*
- * On an LCD, a high value is dark, while a low value is light.
- * So we invert the level.
- *
- * This isn't true on all machines, so we only do it on EDB7211.
- * --rmk
- */
- if (machine_is_edb7211()) {
- level = 15 - level;
- }
- shift = 4 * (regno & 7);
- level <<= shift;
- mask = 15 << shift;
- level &= mask;
- regno = regno < 8 ? PALLSW : PALMSW;
- pal = clps_readl(regno);
- pal = (pal & ~mask) | level;
- clps_writel(pal, regno);
- return 0;
- }
-
- /*
- * Set the colormap
- */
- static int
- clps7111fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
- struct fb_info *info)
- {
- struct clps7111fb_info *cfb = (struct clps7111fb_info *)info;
- struct fb_cmap *dcmap = &fb_display[con].cmap;
- int err = 0;
- /* no colormap allocated? */
- if (!dcmap->len)
- err = fb_alloc_cmap(dcmap, CMAP_SIZE, 0);
- if (!err && con == cfb->currcon) {
- err = fb_set_cmap(cmap, kspc, clps7111fb_setcolreg, &cfb->fb);
- dcmap = &cfb->fb.cmap;
- }
- if (!err)
- fb_copy_cmap(cmap, dcmap, kspc ? 0 : 1);
- return err;
- }
- /*
- * Set the User Defined Part of the Display
- */
- static int
- clps7111fb_set_var(struct fb_var_screeninfo *var, int con,
- struct fb_info *info)
- {
- struct display *display;
- unsigned int lcdcon, syscon;
- int chgvar = 0;
- if (var->activate & FB_ACTIVATE_TEST)
- return 0;
- if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
- return -EINVAL;
- if (cfb->fb.var.xres != var->xres)
- chgvar = 1;
- if (cfb->fb.var.yres != var->yres)
- chgvar = 1;
- if (cfb->fb.var.xres_virtual != var->xres_virtual)
- chgvar = 1;
- if (cfb->fb.var.yres_virtual != var->yres_virtual)
- chgvar = 1;
- if (cfb->fb.var.bits_per_pixel != var->bits_per_pixel)
- chgvar = 1;
- if (con < 0) {
- display = cfb->fb.disp;
- chgvar = 0;
- } else {
- display = fb_display + con;
- }
- var->transp.msb_right = 0;
- var->transp.offset = 0;
- var->transp.length = 0;
- var->red.msb_right = 0;
- var->red.offset = 0;
- var->red.length = var->bits_per_pixel;
- var->green = var->red;
- var->blue = var->red;
- switch (var->bits_per_pixel) {
- #ifdef FBCON_HAS_MFB
- case 1:
- cfb->fb.fix.visual = FB_VISUAL_MONO01;
- display->dispsw = &fbcon_mfb;
- display->dispsw_data = NULL;
- break;
- #endif
- #ifdef FBCON_HAS_CFB2
- case 2:
- cfb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
- display->dispsw = &fbcon_cfb2;
- display->dispsw_data = NULL;
- break;
- #endif
- #ifdef FBCON_HAS_CFB4
- case 4:
- cfb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
- display->dispsw = &fbcon_cfb4;
- display->dispsw_data = NULL;
- break;
- #endif
- default:
- return -EINVAL;
- }
- display->next_line = var->xres_virtual * var->bits_per_pixel / 8;
- cfb->fb.fix.line_length = display->next_line;
- display->screen_base = cfb->fb.screen_base;
- display->line_length = cfb->fb.fix.line_length;
- display->visual = cfb->fb.fix.visual;
- display->type = cfb->fb.fix.type;
- display->type_aux = cfb->fb.fix.type_aux;
- display->ypanstep = cfb->fb.fix.ypanstep;
- display->ywrapstep = cfb->fb.fix.ywrapstep;
- display->can_soft_blank = 1;
- display->inverse = 0;
- cfb->fb.var = *var;
- cfb->fb.var.activate &= ~FB_ACTIVATE_ALL;
- /*
- * Update the old var. The fbcon drivers still use this.
- * Once they are using cfb->fb.var, this can be dropped.
- * --rmk
- */
- display->var = cfb->fb.var;
- /*
- * If we are setting all the virtual consoles, also set the
- * defaults used to create new consoles.
- */
- if (var->activate & FB_ACTIVATE_ALL)
- cfb->fb.disp->var = cfb->fb.var;
- if (chgvar && info && cfb->fb.changevar)
- cfb->fb.changevar(con);
- /*
- * LCDCON must only be changed while the LCD is disabled
- */
- lcdcon = (var->xres_virtual * var->yres_virtual * var->bits_per_pixel) / 128 - 1;
- lcdcon |= ((var->xres_virtual / 16) - 1) << 13;
- lcdcon |= 2 << 19;
- lcdcon |= 13 << 25;
- lcdcon |= LCDCON_GSEN;
- lcdcon |= LCDCON_GSMD;
- syscon = clps_readl(SYSCON1);
- clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1);
- clps_writel(lcdcon, LCDCON);
- clps_writel(syscon | SYSCON1_LCDEN, SYSCON1);
- fb_set_cmap(&cfb->fb.cmap, 1, clps7111fb_setcolreg, &cfb->fb);
- return 0;
- }
- /*
- * Get the currently displayed virtual consoles colormap.
- */
- static int
- gen_get_cmap(struct fb_cmap *cmap, int kspc, int con, struct fb_info *info)
- {
- fb_copy_cmap(&info->cmap, cmap, kspc ? 0 : 2);
- return 0;
- }
- /*
- * Get the currently displayed virtual consoles fixed part of the display.
- */
- static int
- gen_get_fix(struct fb_fix_screeninfo *fix, int con, struct fb_info *info)
- {
- *fix = info->fix;
- return 0;
- }
- /*
- * Get the current user defined part of the display.
- */
- static int
- gen_get_var(struct fb_var_screeninfo *var, int con, struct fb_info *info)
- {
- *var = info->var;
- return 0;
- }
- static struct fb_ops clps7111fb_ops = {
- owner: THIS_MODULE,
- fb_set_var: clps7111fb_set_var,
- fb_set_cmap: clps7111fb_set_cmap,
- fb_get_fix: gen_get_fix,
- fb_get_var: gen_get_var,
- fb_get_cmap: gen_get_cmap,
- };
- static int clps7111fb_switch(int con, struct fb_info *info)
- {
- struct clps7111fb_info *cfb = (struct clps7111fb_info *)info;
- struct display *disp;
- struct fb_cmap *cmap;
- if (cfb->currcon >= 0) {
- disp = fb_display + cfb->currcon;
- /*
- * Save the old colormap and video mode.
- */
- disp->var = cfb->fb.var;
- if (disp->cmap.len)
- fb_copy_cmap(&cfb->fb.cmap, &disp->cmap, 0);
- }
- cfb->currcon = con;
- disp = fb_display + con;
- /*
- * Install the new colormap and change the video mode. By default,
- * fbcon sets all the colormaps and video modes to the default
- * values at bootup.
- */
- if (disp->cmap.len)
- cmap = &disp->cmap;
- else
- cmap = fb_default_cmap(CMAP_SIZE);
- fb_copy_cmap(cmap, &cfb->fb.cmap, 0);
- cfb->fb.var = disp->var;
- cfb->fb.var.activate = FB_ACTIVATE_NOW;
- clps7111fb_set_var(&cfb->fb.var, con, &cfb->fb);
- return 0;
- }
- static int clps7111fb_updatevar(int con, struct fb_info *info)
- {
- return -EINVAL;
- }
- static void clps7111fb_blank(int blank, struct fb_info *info)
- {
- if (blank) {
- if (machine_is_edb7211()) {
- int i;
- /* Turn off the LCD backlight. */
- clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR);
- /* Power off the LCD DC-DC converter. */
- clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR);
- /* Delay for a little while (half a second). */
- for (i=0; i<65536*4; i++);
- /* Power off the LCD panel. */
- clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR);
- /* Power off the LCD controller. */
- clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN,
- SYSCON1);
- }
- } else {
- if (machine_is_edb7211()) {
- int i;
- /* Power up the LCD controller. */
- clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN,
- SYSCON1);
- /* Power up the LCD panel. */
- clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);
- /* Delay for a little while. */
- for (i=0; i<65536*4; i++);
- /* Power up the LCD DC-DC converter. */
- clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN,
- PDDR);
- /* Turn on the LCD backlight. */
- clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR);
- }
- }
- }
- static int
- clps7111fb_proc_backlight_read(char *page, char **start, off_t off,
- int count, int *eof, void *data)
- {
- /* We need at least two characters, one for the digit, and one for
- * the terminating NULL. */
- if (count < 2)
- return -EINVAL;
- if (machine_is_edb7211()) {
- return sprintf(page, "%dn",
- (clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0);
- }
- return 0;
- }
- static int
- clps7111fb_proc_backlight_write(struct file *file, const char *buffer,
- unsigned long count, void *data)
- {
- unsigned char char_value;
- int value;
- if (count < 1) {
- return -EINVAL;
- }
- if (copy_from_user(&char_value, buffer, 1))
- return -EFAULT;
- value = char_value - '0';
- if (machine_is_edb7211()) {
- unsigned char port_d;
- port_d = clps_readb(PDDR);
- if (value) {
- port_d |= EDB_PD3_LCDBL;
- } else {
- port_d &= ~EDB_PD3_LCDBL;
- }
- clps_writeb(port_d, PDDR);
- }
- return count;
- }
- int __init clps711xfb_init(void)
- {
- int err = -ENOMEM;
- cfb = kmalloc(sizeof(*cfb) + sizeof(struct display), GFP_KERNEL);
- if (!cfb)
- goto out;
- memset(cfb, 0, sizeof(*cfb) + sizeof(struct display));
- memset((void *)PAGE_OFFSET, 0, 0x14000);
- cfb->currcon = -1;
- strcpy(cfb->fb.fix.id, "clps7111");
- cfb->fb.screen_base = (void *)PAGE_OFFSET;
- cfb->fb.fix.smem_start = PAGE_OFFSET;
- cfb->fb.fix.smem_len = 0x14000;
- cfb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
- cfb->fb.var.xres = 640;
- cfb->fb.var.xres_virtual = 640;
- cfb->fb.var.yres = 240;
- cfb->fb.var.yres_virtual = 240;
- cfb->fb.var.bits_per_pixel = 4;
- cfb->fb.var.grayscale = 1;
- cfb->fb.var.activate = FB_ACTIVATE_NOW;
- cfb->fb.var.height = -1;
- cfb->fb.var.width = -1;
- cfb->fb.fbops = &clps7111fb_ops;
- cfb->fb.changevar = NULL;
- cfb->fb.switch_con = clps7111fb_switch;
- cfb->fb.updatevar = clps7111fb_updatevar;
- cfb->fb.blank = clps7111fb_blank;
- cfb->fb.flags = FBINFO_FLAG_DEFAULT;
- cfb->fb.disp = (struct display *)(cfb + 1);
- fb_alloc_cmap(&cfb->fb.cmap, CMAP_SIZE, 0);
- /* Register the /proc entries. */
- clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444,
- &proc_root);
- if (clps7111fb_backlight_proc_entry == NULL) {
- printk("Couldn't create the /proc entry for the backlight.n");
- return -EINVAL;
- }
- clps7111fb_backlight_proc_entry->read_proc =
- &clps7111fb_proc_backlight_read;
- clps7111fb_backlight_proc_entry->write_proc =
- &clps7111fb_proc_backlight_write;
- /*
- * Power up the LCD
- */
- if (machine_is_p720t()) {
- PLD_LCDEN = PLD_LCDEN_EN;
- PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON);
- }
- if (machine_is_edb7211()) {
- int i;
- /* Power up the LCD panel. */
- clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);
- /* Delay for a little while. */
- for (i=0; i<65536*4; i++);
- /* Power up the LCD DC-DC converter. */
- clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR);
- /* Turn on the LCD backlight. */
- clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR);
- }
- clps7111fb_set_var(&cfb->fb.var, -1, &cfb->fb);
- err = register_framebuffer(&cfb->fb);
- out: return err;
- }
- static void __exit clps711xfb_exit(void)
- {
- unregister_framebuffer(&cfb->fb);
- kfree(cfb);
- /*
- * Power down the LCD
- */
- if (machine_is_p720t()) {
- PLD_LCDEN = 0;
- PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON);
- }
- }
- #ifdef MODULE
- module_init(clps711xfb_init);
- #endif
- module_exit(clps711xfb_exit);