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- /*
- * 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 Pötzl <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 Pötzl <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/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 * var->bits_per_pixel / 16) & 0x3ff);
- 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 */
- switch (var->bits_per_pixel) {
- case 1:
- case 2:
- case 4:
- var->red.offset = 0;
- var->red.length = var->bits_per_pixel;
- var->green = var->red;
- var->blue = var->red;
- var->transp.offset = 0;
- var->transp.length = 0;
- break;
- case 8:
- if ( fbi->mach_info->type != S3C2410_LCDCON1_TFT ) {
- /* 8 bpp 332 */
- var->red.length = 3;
- var->red.offset = 5;
- var->green.length = 3;
- var->green.offset = 2;
- var->blue.length = 2;
- var->blue.offset = 0;
- var->transp.length = 0;
- } else {
- var->red.offset = 0;
- var->red.length = var->bits_per_pixel;
- var->green = var->red;
- var->blue = var->red;
- var->transp.offset = 0;
- var->transp.length = 0;
- }
- break;
- case 12:
- /* 12 bpp 444 */
- var->red.length = 4;
- var->red.offset = 8;
- var->green.length = 4;
- var->green.offset = 4;
- var->blue.length = 4;
- var->blue.offset = 0;
- var->transp.length = 0;
- break;
- default:
- case 16:
- if (fbi->regs.lcdcon5 & S3C2410_LCDCON5_FRM565 ) {
- /* 16 bpp, 565 format */
- 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 {
- /* 16 bpp, 5551 format */
- var->red.offset = 11;
- var->green.offset = 6;
- var->blue.offset = 1;
- var->red.length = 5;
- var->green.length = 5;
- var->blue.length = 5;
- var->transp.length = 0;
- }
- break;
- case 24:
- /* 24 bpp 888 */
- var->red.length = 8;
- var->red.offset = 16;
- var->green.length = 8;
- var->green.offset = 8;
- var->blue.length = 8;
- var->blue.offset = 0;
- var->transp.length = 0;
- break;
- }
- 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)
- {
- int hs;
- fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK;
- fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_TFT;
- 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);
- fbi->regs.lcdcon1 |= fbi->mach_info->type;
- if (fbi->mach_info->type == S3C2410_LCDCON1_TFT)
- 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;
- default:
- /* invalid pixel depth */
- dev_err(fbi->dev, "invalid bpp %d\n", var->bits_per_pixel);
- }
- else
- switch (var->bits_per_pixel) {
- case 1:
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN1BPP;
- break;
- case 2:
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN2GREY;
- break;
- case 4:
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN4GREY;
- break;
- case 8:
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN8BPP;
- break;
- case 12:
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN12BPP;
- break;
- default:
- /* invalid pixel depth */
- dev_err(fbi->dev, "invalid bpp %d\n", var->bits_per_pixel);
- }
- /* 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);
- switch(fbi->mach_info->type) {
- case S3C2410_LCDCON1_DSCAN4:
- case S3C2410_LCDCON1_STN8:
- hs = var->xres / 8;
- break;
- case S3C2410_LCDCON1_STN4:
- hs = var->xres / 4;
- break;
- default:
- case S3C2410_LCDCON1_TFT:
- hs = var->xres;
- break;
- }
- /* Special cases : STN color displays */
- if ( ((fbi->regs.lcdcon1 & S3C2410_LCDCON1_MODEMASK) == S3C2410_LCDCON1_STN8BPP) \
- || ((fbi->regs.lcdcon1 & S3C2410_LCDCON1_MODEMASK) == S3C2410_LCDCON1_STN12BPP) ) {
- hs = hs * 3;
- }
- fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff);
- fbi->regs.lcdcon3 |= S3C2410_LCDCON3_HOZVAL(hs - 1);
- if (var->pixclock > 0) {
- int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock);
- if (fbi->mach_info->type == S3C2410_LCDCON1_TFT) {
- clkdiv = (clkdiv / 2) -1;
- if (clkdiv < 0)
- clkdiv = 0;
- }
- else {
- clkdiv = (clkdiv / 2);
- if (clkdiv < 2)
- clkdiv = 2;
- }
- fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_CLKVAL(0x3ff);
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_CLKVAL(clkdiv);
- }
- /* write new registers */
- dprintk("new register set:\n");
- dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
- dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
- dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
- dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
- dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
- writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
- writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
- writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
- writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
- writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
- /* set lcd address pointers */
- s3c2410fb_set_lcdaddr(fbi);
- writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
- }
- /*
- * s3c2410fb_set_par - Optional function. Alters the hardware state.
- * @info: frame buffer structure that represents a single frame buffer
- *
- */
- static int s3c2410fb_set_par(struct fb_info *info)
- {
- struct s3c2410fb_info *fbi = info->par;
- struct fb_var_screeninfo *var = &info->var;
- switch (var->bits_per_pixel)
- {
- case 16:
- fbi->fb->fix.visual = FB_VISUAL_TRUECOLOR;
- break;
- case 1:
- fbi->fb->fix.visual = FB_VISUAL_MONO01;
- break;
- default:
- fbi->fb->fix.visual = FB_VISUAL_PSEUDOCOLOR;
- break;
- }
- fbi->fb->fix.line_length = (var->width*var->bits_per_pixel)/8;
- /* activate this new configuration */
- s3c2410fb_activate_var(fbi, var);
- return 0;
- }
- static void schedule_palette_update(struct s3c2410fb_info *fbi,
- unsigned int regno, unsigned int val)
- {
- unsigned long flags;
- unsigned long irqen;
- local_irq_save(flags);
- fbi->palette_buffer[regno] = val;
- if (!fbi->palette_ready) {
- fbi->palette_ready = 1;
- /* enable IRQ */
- irqen = readl(S3C2410_LCDINTMSK);
- irqen &= ~S3C2410_LCDINT_FRSYNC;
- writel(irqen, S3C2410_LCDINTMSK);
- }
- local_irq_restore(flags);
- }
- /* from pxafb.c */
- static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
- {
- chan &= 0xffff;
- chan >>= 16 - bf->length;
- return chan << bf->offset;
- }
- static int s3c2410fb_setcolreg(unsigned regno,
- unsigned red, unsigned green, unsigned blue,
- unsigned transp, struct fb_info *info)
- {
- struct s3c2410fb_info *fbi = info->par;
- unsigned int val;
- /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n", regno, red, green, blue); */
- switch (fbi->fb->fix.visual) {
- case FB_VISUAL_TRUECOLOR:
- /* true-colour, use pseuo-palette */
- if (regno < 16) {
- u32 *pal = fbi->fb->pseudo_palette;
- val = chan_to_field(red, &fbi->fb->var.red);
- val |= chan_to_field(green, &fbi->fb->var.green);
- val |= chan_to_field(blue, &fbi->fb->var.blue);
- pal[regno] = val;
- }
- break;
- case FB_VISUAL_PSEUDOCOLOR:
- if (regno < 256) {
- /* currently assume RGB 5-6-5 mode */
- val = ((red >> 0) & 0xf800);
- val |= ((green >> 5) & 0x07e0);
- val |= ((blue >> 11) & 0x001f);
- writel(val, S3C2410_TFTPAL(regno));
- schedule_palette_update(fbi, regno, val);
- }
- break;
- default:
- return 1; /* unknown type */
- }
- return 0;
- }
- /**
- * s3c2410fb_blank
- * @blank_mode: the blank mode we want.
- * @info: frame buffer structure that represents a single frame buffer
- *
- * Blank the screen if blank_mode != 0, else unblank. Return 0 if
- * blanking succeeded, != 0 if un-/blanking failed due to e.g. a
- * video mode which doesn't support it. Implements VESA suspend
- * and powerdown modes on hardware that supports disabling hsync/vsync:
- * blank_mode == 2: suspend vsync
- * blank_mode == 3: suspend hsync
- * blank_mode == 4: powerdown
- *
- * Returns negative errno on error, or zero on success.
- *
- */
- static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
- {
- dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
- if (mach_info == NULL)
- return -EINVAL;
- if (blank_mode == FB_BLANK_UNBLANK)
- writel(0x0, S3C2410_TPAL);
- else {
- dprintk("setting TPAL to output 0x000000\n");
- writel(S3C2410_TPAL_EN, S3C2410_TPAL);
- }
- return 0;
- }
- static int s3c2410fb_debug_show(struct device *dev, struct device_attribute *attr, char *buf)
- {
- return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
- }
- static int s3c2410fb_debug_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len)
- {
- if (mach_info == NULL)
- return -EINVAL;
- if (len < 1)
- return -EINVAL;
- if (strnicmp(buf, "on", 2) == 0 ||
- strnicmp(buf, "1", 1) == 0) {
- debug = 1;
- printk(KERN_DEBUG "s3c2410fb: Debug On");
- } else if (strnicmp(buf, "off", 3) == 0 ||
- strnicmp(buf, "0", 1) == 0) {
- debug = 0;
- printk(KERN_DEBUG "s3c2410fb: Debug Off");
- } else {
- return -EINVAL;
- }
- return len;
- }
- static DEVICE_ATTR(debug, 0666,
- s3c2410fb_debug_show,
- s3c2410fb_debug_store);
- static struct fb_ops s3c2410fb_ops = {
- .owner = THIS_MODULE,
- .fb_check_var = s3c2410fb_check_var,
- .fb_set_par = s3c2410fb_set_par,
- .fb_blank = s3c2410fb_blank,
- .fb_setcolreg = s3c2410fb_setcolreg,
- .fb_fillrect = cfb_fillrect,
- .fb_copyarea = cfb_copyarea,
- .fb_imageblit = cfb_imageblit,
- };
- /*
- * s3c2410fb_map_video_memory():
- * Allocates the DRAM memory for the frame buffer. This buffer is
- * remapped into a non-cached, non-buffered, memory region to
- * allow palette and pixel writes to occur without flushing the
- * cache. Once this area is remapped, all virtual memory
- * access to the video memory should occur at the new region.
- */
- static int __init s3c2410fb_map_video_memory(struct s3c2410fb_info *fbi)
- {
- dprintk("map_video_memory(fbi=%p)\n", fbi);
- fbi->map_size = PAGE_ALIGN(fbi->fb->fix.smem_len + PAGE_SIZE);
- fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
- &fbi->map_dma, GFP_KERNEL);
- fbi->map_size = fbi->fb->fix.smem_len;
- if (fbi->map_cpu) {
- /* prevent initial garbage on screen */
- dprintk("map_video_memory: clear %p:%08x\n",
- fbi->map_cpu, fbi->map_size);
- memset(fbi->map_cpu, 0xf0, fbi->map_size);
- fbi->screen_dma = fbi->map_dma;
- fbi->fb->screen_base = fbi->map_cpu;
- fbi->fb->fix.smem_start = fbi->screen_dma;
- dprintk("map_video_memory: dma=%08x cpu=%p size=%08x\n",
- fbi->map_dma, fbi->map_cpu, fbi->fb->fix.smem_len);
- }
- return fbi->map_cpu ? 0 : -ENOMEM;
- }
- static inline void s3c2410fb_unmap_video_memory(struct s3c2410fb_info *fbi)
- {
- dma_free_writecombine(fbi->dev,fbi->map_size,fbi->map_cpu, fbi->map_dma);
- }
- static inline void modify_gpio(void __iomem *reg,
- unsigned long set, unsigned long mask)
- {
- unsigned long tmp;
- tmp = readl(reg) & ~mask;
- writel(tmp | set, reg);
- }
- /*
- * s3c2410fb_init_registers - Initialise all LCD-related registers
- */
- static int s3c2410fb_init_registers(struct s3c2410fb_info *fbi)
- {
- unsigned long flags;
- /* Initialise LCD with values from haret */
- local_irq_save(flags);
- /* modify the gpio(s) with interrupts set (bjd) */
- modify_gpio(S3C2410_GPCUP, mach_info->gpcup, mach_info->gpcup_mask);
- modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
- modify_gpio(S3C2410_GPDUP, mach_info->gpdup, mach_info->gpdup_mask);
- modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);
- local_irq_restore(flags);
- writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
- writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
- writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
- writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
- writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
- s3c2410fb_set_lcdaddr(fbi);
- dprintk("LPCSEL = 0x%08lx\n", mach_info->lpcsel);
- writel(mach_info->lpcsel, S3C2410_LPCSEL);
- dprintk("replacing TPAL %08x\n", readl(S3C2410_TPAL));
- /* ensure temporary palette disabled */
- writel(0x00, S3C2410_TPAL);
- /* Enable video by setting the ENVID bit to 1 */
- fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
- writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
- return 0;
- }
- static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
- {
- unsigned int i;
- unsigned long ent;
- fbi->palette_ready = 0;
- for (i = 0; i < 256; i++) {
- if ((ent = fbi->palette_buffer[i]) == PALETTE_BUFF_CLEAR)
- continue;
- writel(ent, S3C2410_TFTPAL(i));
- /* it seems the only way to know exactly
- * if the palette wrote ok, is to check
- * to see if the value verifies ok
- */
- if (readw(S3C2410_TFTPAL(i)) == ent)
- fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
- else
- fbi->palette_ready = 1; /* retry */
- }
- }
- static irqreturn_t s3c2410fb_irq(int irq, void *dev_id)
- {
- struct s3c2410fb_info *fbi = dev_id;
- unsigned long lcdirq = readl(S3C2410_LCDINTPND);
- if (lcdirq & S3C2410_LCDINT_FRSYNC) {
- if (fbi->palette_ready)
- s3c2410fb_write_palette(fbi);
- writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDINTPND);
- writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDSRCPND);
- }
- return IRQ_HANDLED;
- }
- static char driver_name[]="s3c2410fb";
- static int __init s3c2410fb_probe(struct platform_device *pdev)
- {
- struct s3c2410fb_info *info;
- struct fb_info *fbinfo;
- struct s3c2410fb_hw *mregs;
- int ret;
- int irq;
- int i;
- u32 lcdcon1;
- mach_info = pdev->dev.platform_data;
- if (mach_info == NULL) {
- dev_err(&pdev->dev,"no platform data for lcd, cannot attach\n");
- return -EINVAL;
- }
- mregs = &mach_info->regs;
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_err(&pdev->dev, "no irq for device\n");
- return -ENOENT;
- }
- fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
- if (!fbinfo) {
- return -ENOMEM;
- }
- info = fbinfo->par;
- info->fb = fbinfo;
- info->dev = &pdev->dev;
- platform_set_drvdata(pdev, fbinfo);
- dprintk("devinit\n");
- strcpy(fbinfo->fix.id, driver_name);
- memcpy(&info->regs, &mach_info->regs, sizeof(info->regs));
- /* Stop the video and unset ENVID if set */
- info->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
- lcdcon1 = readl(S3C2410_LCDCON1);
- writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
- info->mach_info = pdev->dev.platform_data;
- fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
- fbinfo->fix.type_aux = 0;
- fbinfo->fix.xpanstep = 0;
- fbinfo->fix.ypanstep = 0;
- fbinfo->fix.ywrapstep = 0;
- fbinfo->fix.accel = FB_ACCEL_NONE;
- fbinfo->var.nonstd = 0;
- fbinfo->var.activate = FB_ACTIVATE_NOW;
- fbinfo->var.height = mach_info->height;
- fbinfo->var.width = mach_info->width;
- fbinfo->var.accel_flags = 0;
- fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
- fbinfo->fbops = &s3c2410fb_ops;
- fbinfo->flags = FBINFO_FLAG_DEFAULT;
- fbinfo->pseudo_palette = &info->pseudo_pal;
- fbinfo->var.xres = mach_info->xres.defval;
- fbinfo->var.xres_virtual = mach_info->xres.defval;
- fbinfo->var.yres = mach_info->yres.defval;
- fbinfo->var.yres_virtual = mach_info->yres.defval;
- fbinfo->var.bits_per_pixel = mach_info->bpp.defval;
- fbinfo->var.upper_margin = S3C2410_LCDCON2_GET_VBPD(mregs->lcdcon2) + 1;
- fbinfo->var.lower_margin = S3C2410_LCDCON2_GET_VFPD(mregs->lcdcon2) + 1;
- fbinfo->var.vsync_len = S3C2410_LCDCON2_GET_VSPW(mregs->lcdcon2) + 1;
- fbinfo->var.left_margin = S3C2410_LCDCON3_GET_HFPD(mregs->lcdcon3) + 1;
- fbinfo->var.right_margin = S3C2410_LCDCON3_GET_HBPD(mregs->lcdcon3) + 1;
- fbinfo->var.hsync_len = S3C2410_LCDCON4_GET_HSPW(mregs->lcdcon4) + 1;
- fbinfo->var.red.offset = 11;
- fbinfo->var.green.offset = 5;
- fbinfo->var.blue.offset = 0;
- fbinfo->var.transp.offset = 0;
- fbinfo->var.red.length = 5;
- fbinfo->var.green.length = 6;
- fbinfo->var.blue.length = 5;
- fbinfo->var.transp.length = 0;
- fbinfo->fix.smem_len = mach_info->xres.max *
- mach_info->yres.max *
- mach_info->bpp.max / 8;
- for (i = 0; i < 256; i++)
- info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
- if (!request_mem_region((unsigned long)S3C24XX_VA_LCD, SZ_1M, "s3c2410-lcd")) {
- ret = -EBUSY;
- goto dealloc_fb;
- }
- dprintk("got LCD region\n");
- ret = request_irq(irq, s3c2410fb_irq, IRQF_DISABLED, pdev->name, info);
- if (ret) {
- dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
- ret = -EBUSY;
- goto release_mem;
- }
- info->clk = clk_get(NULL, "lcd");
- if (!info->clk || IS_ERR(info->clk)) {
- printk(KERN_ERR "failed to get lcd clock source\n");
- ret = -ENOENT;
- goto release_irq;
- }
- clk_enable(info->clk);
- dprintk("got and enabled clock\n");
- msleep(1);
- /* Initialize video memory */
- ret = s3c2410fb_map_video_memory(info);
- if (ret) {
- printk( KERN_ERR "Failed to allocate video RAM: %d\n", ret);
- ret = -ENOMEM;
- goto release_clock;
- }
- dprintk("got video memory\n");
- ret = s3c2410fb_init_registers(info);
- ret = s3c2410fb_check_var(&fbinfo->var, fbinfo);
- ret = register_framebuffer(fbinfo);
- if (ret < 0) {
- printk(KERN_ERR "Failed to register framebuffer device: %d\n", ret);
- goto free_video_memory;
- }
- /* create device files */
- device_create_file(&pdev->dev, &dev_attr_debug);
- printk(KERN_INFO "fb%d: %s frame buffer device\n",
- fbinfo->node, fbinfo->fix.id);
- return 0;
- free_video_memory:
- s3c2410fb_unmap_video_memory(info);
- release_clock:
- clk_disable(info->clk);
- clk_put(info->clk);
- release_irq:
- free_irq(irq,info);
- release_mem:
- release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
- dealloc_fb:
- framebuffer_release(fbinfo);
- return ret;
- }
- /* s3c2410fb_stop_lcd
- *
- * shutdown the lcd controller
- */
- static void s3c2410fb_stop_lcd(struct s3c2410fb_info *fbi)
- {
- unsigned long flags;
- local_irq_save(flags);
- fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
- writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
- local_irq_restore(flags);
- }
- /*
- * Cleanup
- */
- static int s3c2410fb_remove(struct platform_device *pdev)
- {
- struct fb_info *fbinfo = platform_get_drvdata(pdev);
- struct s3c2410fb_info *info = fbinfo->par;
- int irq;
- s3c2410fb_stop_lcd(info);
- msleep(1);
- s3c2410fb_unmap_video_memory(info);
- if (info->clk) {
- clk_disable(info->clk);
- clk_put(info->clk);
- info->clk = NULL;
- }
- irq = platform_get_irq(pdev, 0);
- free_irq(irq,info);
- release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
- unregister_framebuffer(fbinfo);
- return 0;
- }
- #ifdef CONFIG_PM
- /* suspend and resume support for the lcd controller */
- static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
- {
- struct fb_info *fbinfo = platform_get_drvdata(dev);
- struct s3c2410fb_info *info = fbinfo->par;
- s3c2410fb_stop_lcd(info);
- /* sleep before disabling the clock, we need to ensure
- * the LCD DMA engine is not going to get back on the bus
- * before the clock goes off again (bjd) */
- msleep(1);
- clk_disable(info->clk);
- return 0;
- }
- static int s3c2410fb_resume(struct platform_device *dev)
- {
- struct fb_info *fbinfo = platform_get_drvdata(dev);
- struct s3c2410fb_info *info = fbinfo->par;
- clk_enable(info->clk);
- msleep(1);
- s3c2410fb_init_registers(info);
- return 0;
- }
- #else
- #define s3c2410fb_suspend NULL
- #define s3c2410fb_resume NULL
- #endif
- static struct platform_driver s3c2410fb_driver = {
- .probe = s3c2410fb_probe,
- .remove = s3c2410fb_remove,
- .suspend = s3c2410fb_suspend,
- .resume = s3c2410fb_resume,
- .driver = {
- .name = "s3c2410-lcd",
- .owner = THIS_MODULE,
- },
- };
- int __devinit s3c2410fb_init(void)
- {
- return platform_driver_register(&s3c2410fb_driver);
- }
- static void __exit s3c2410fb_cleanup(void)
- {
- platform_driver_unregister(&s3c2410fb_driver);
- }
- module_init(s3c2410fb_init);
- module_exit(s3c2410fb_cleanup);
- MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, Ben Dooks <ben-linux@fluff.org>");
- MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
- MODULE_LICENSE("GPL");
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