S3C2410_LCD.rar_linux 项目_linux液晶驱动_s3c2410 lcd 直接

/* * linux/drivers/video/s3c2410fb.c * Copyright (c) Arnaud Patard, Ben Dooks * * 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. * * S3C2410 LCD Controller Frame Buffer Driver * based on skeletonfb.c, sa1100fb.c and others * * ChangeLog * 2005-04-07: Arnaud Patard <arnaud.patard@rtp-net.org> * - u32 state -> pm_message_t state * - S3C2410_{VA,SZ}_LCD -> S3C24XX * * 2005-03-15: Arnaud Patard <arnaud.patard@rtp-net.org> * - Removed the ioctl * - use readl/writel instead of __raw_writel/__raw_readl * * 2004-12-04: Arnaud Patard <arnaud.patard@rtp-net.org> * - Added the possibility to set on or off the * debugging mesaages * - Replaced 0 and 1 by on or off when reading the * /sys files * * 2005-03-23: Ben Dooks <ben-linux@fluff.org> * - added non 16bpp modes * - updated platform information for range of x/y/bpp * - add code to ensure palette is written correctly * - add pixel clock divisor control * * 2004-11-11: Arnaud Patard <arnaud.patard@rtp-net.org> * - Removed the use of currcon as it no more exist * - Added LCD power sysfs interface * * 2004-11-03: Ben Dooks <ben-linux@fluff.org> * - minor cleanups * - add suspend/resume support * - s3c2410fb_setcolreg() not valid in >8bpp modes * - removed last CONFIG_FB_S3C2410_FIXED * - ensure lcd controller stopped before cleanup * - added sysfs interface for backlight power * - added mask for gpio configuration * - ensured IRQs disabled during GPIO configuration * - disable TPAL before enabling video * * 2004-09-20: Arnaud Patard <arnaud.patard@rtp-net.org> * - Suppress command line options * * 2004-09-15: Arnaud Patard <arnaud.patard@rtp-net.org> * - code cleanup * * 2004-09-07: Arnaud Patard <arnaud.patard@rtp-net.org> * - Renamed from h1940fb.c to s3c2410fb.c * - Add support for different devices * - Backlight support * * 2004-09-05: Herbert P�tzl <herbert@13thfloor.at> * - added clock (de-)allocation code * - added fixem fbmem option * * 2004-07-27: Arnaud Patard <arnaud.patard@rtp-net.org> * - code cleanup * - added a forgotten return in h1940fb_init * * 2004-07-19: Herbert P�tzl <herbert@13thfloor.at> * - code cleanup and extended debugging * * 2004-07-15: Arnaud Patard <arnaud.patard@rtp-net.org> * - First version */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/tty.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/workqueue.h> #include <linux/wait.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/div64.h> #include <asm/mach/map.h> #include <asm/arch/regs-lcd.h> #include <asm/arch/regs-gpio.h> #include <asm/arch/fb.h> #ifdef CONFIG_PM #include <linux/pm.h> #endif #include "s3c2410fb.h" static struct s3c2410fb_mach_info *mach_info; /* Debugging stuff */ #ifdef CONFIG_FB_S3C2410_DEBUG static int debug = 1; #else static int debug = 0; #endif #define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); } /* useful functions */ /* s3c2410fb_set_lcdaddr * * initialise lcd controller address pointers */ static void s3c2410fb_set_lcdaddr(struct s3c2410fb_info *fbi) { struct fb_var_screeninfo *var = &fbi->fb->var; unsigned long saddr1, saddr2, saddr3; saddr1 = fbi->fb->fix.smem_start >> 1; saddr2 = fbi->fb->fix.smem_start; saddr2 += (var->xres * var->yres * var->bits_per_pixel)/8; saddr2>>= 1; saddr3 = S3C2410_OFFSIZE(0) | S3C2410_PAGEWIDTH(var->xres); dprintk("LCDSADDR1 = 0x%08lx\n", saddr1); dprintk("LCDSADDR2 = 0x%08lx\n", saddr2); dprintk("LCDSADDR3 = 0x%08lx\n", saddr3); writel(saddr1, S3C2410_LCDSADDR1); writel(saddr2, S3C2410_LCDSADDR2); writel(saddr3, S3C2410_LCDSADDR3); } /* s3c2410fb_calc_pixclk() * * calculate divisor for clk->pixclk */ static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi, unsigned long pixclk) { unsigned long clk = clk_get_rate(fbi->clk); unsigned long long div; /* pixclk is in picoseoncds, our clock is in Hz * * Hz -> picoseconds is / 10^-12 */ div = (unsigned long long)clk * pixclk; do_div(div,1000000UL); do_div(div,1000000UL); dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div); return div; } /* * s3c2410fb_check_var(): * Get the video params out of 'var'. If a value doesn't fit, round it up, * if it's too big, return -EINVAL. * */ static int s3c2410fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct s3c2410fb_info *fbi = info->par; dprintk("check_var(var=%p, info=%p)\n", var, info); /* validate x/y resolution */ if (var->yres > fbi->mach_info->yres.max) var->yres = fbi->mach_info->yres.max; else if (var->yres < fbi->mach_info->yres.min) var->yres = fbi->mach_info->yres.min; if (var->xres > fbi->mach_info->xres.max) var->yres = fbi->mach_info->xres.max; else if (var->xres < fbi->mach_info->xres.min) var->xres = fbi->mach_info->xres.min; /* validate bpp */ if (var->bits_per_pixel > fbi->mach_info->bpp.max) var->bits_per_pixel = fbi->mach_info->bpp.max; else if (var->bits_per_pixel < fbi->mach_info->bpp.min) var->bits_per_pixel = fbi->mach_info->bpp.min; /* set r/g/b positions */ if (var->bits_per_pixel == 16) { var->red.offset = 11; var->green.offset = 5; var->blue.offset = 0; var->red.length = 5; var->green.length = 6; var->blue.length = 5; var->transp.length = 0; } else { var->red.length = var->bits_per_pixel; var->red.offset = 0; var->green.length = var->bits_per_pixel; var->green.offset = 0; var->blue.length = var->bits_per_pixel; var->blue.offset = 0; var->transp.length = 0; } return 0; } /* s3c2410fb_activate_var * * activate (set) the controller from the given framebuffer * information */ static void s3c2410fb_activate_var(struct s3c2410fb_info *fbi, struct fb_var_screeninfo *var) { fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK; dprintk("%s: var->xres = %d\n", __FUNCTION__, var->xres); dprintk("%s: var->yres = %d\n", __FUNCTION__, var->yres); dprintk("%s: var->bpp = %d\n", __FUNCTION__, var->bits_per_pixel); switch (var->bits_per_pixel) { case 1: fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT1BPP; break; case 2: fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT2BPP; break; case 4: fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT4BPP; break; case 8: fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT8BPP; break; case 16: fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT16BPP; break; } /* check to see if we need to update sync/borders */ if (!fbi->mach_info->fixed_syncs) { dprintk("setting vert: up=%d, low=%d, sync=%d\n", var->upper_margin, var->lower_margin, var->vsync_len); dprintk("setting horz: lft=%d, rt=%d, sync=%d\n", var->left_margin, var->right_margin, var->hsync_len); fbi->regs.lcdcon2 = S3C2410_LCDCON2_VBPD(var->upper_margin - 1) | S3C2410_LCDCON2_VFPD(var->lower_margin - 1) | S3C2410_LCDCON2_VSPW(var->vsync_len - 1); fbi->regs.lcdcon3 = S3C2410_LCDCON3_HBPD(var->right_margin - 1) | S3C2410_LCDCON3_HFPD(var->left_margin - 1); fbi->regs.lcdcon4 &= ~S3C2410_LCDCON4_HSPW(0xff); fbi->regs.lcdcon4 |= S3C2410_LCDCON4_HSPW(var->hsync_len - 1); } /* update X/Y info */ fbi->regs.lcdcon2 &= ~S3C2410_LCDCON2_LINEVAL(0x3ff); fbi->regs.lcdcon2 |= S3C2410_LCDCON2_LINEVAL(var->yres - 1); fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff); fbi->regs.lcdcon3 |= S3C2410_LCDCON3_HOZVAL(var->xres - 1); if (var->pixclock > 0) { int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock); clkdiv = (clkdiv / 2) -1; if (clkdiv < 0) clkdiv = 0; fbi->regs.lcdcon1 &= ~S3C2410_LCD