1/* 2 * linux/drivers/video/clps711xfb.c 3 * 4 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * Framebuffer driver for the CLPS7111 and EP7212 processors. 21 */ 22#include <linux/mm.h> 23#include <linux/module.h> 24#include <linux/kernel.h> 25#include <linux/seq_file.h> 26#include <linux/slab.h> 27#include <linux/fb.h> 28#include <linux/init.h> 29#include <linux/proc_fs.h> 30#include <linux/delay.h> 31 32#include <mach/hardware.h> 33#include <asm/mach-types.h> 34#include <linux/uaccess.h> 35 36#include <asm/hardware/clps7111.h> 37#include <mach/syspld.h> 38 39struct fb_info *cfb; 40 41#define CMAP_MAX_SIZE 16 42 43/* 44 * LCD AC Prescale. This comes from the LCD panel manufacturers specifications. 45 * This determines how many clocks + 1 of CL1 before the M signal toggles. 46 * The number of lines on the display must not be divisible by this number. 47 */ 48static unsigned int lcd_ac_prescale = 13; 49 50/* 51 * Set a single color register. Return != 0 for invalid regno. 52 */ 53static int 54clps7111fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 55 u_int transp, struct fb_info *info) 56{ 57 unsigned int level, mask, shift, pal; 58 59 if (regno >= (1 << info->var.bits_per_pixel)) 60 return 1; 61 62 /* gray = 0.30*R + 0.58*G + 0.11*B */ 63 level = (red * 77 + green * 151 + blue * 28) >> 20; 64 65 /* 66 * On an LCD, a high value is dark, while a low value is light. 67 * So we invert the level. 68 * 69 * This isn't true on all machines, so we only do it on EDB7211. 70 * --rmk 71 */ 72 if (machine_is_edb7211()) { 73 level = 15 - level; 74 } 75 76 shift = 4 * (regno & 7); 77 level <<= shift; 78 mask = 15 << shift; 79 level &= mask; 80 81 regno = regno < 8 ? PALLSW : PALMSW; 82 83 pal = clps_readl(regno); 84 pal = (pal & ~mask) | level; 85 clps_writel(pal, regno); 86 87 return 0; 88} 89 90/* 91 * Validate the purposed mode. 92 */ 93static int 94clps7111fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 95{ 96 var->transp.msb_right = 0; 97 var->transp.offset = 0; 98 var->transp.length = 0; 99 var->red.msb_right = 0; 100 var->red.offset = 0; 101 var->red.length = var->bits_per_pixel; 102 var->green = var->red; 103 var->blue = var->red; 104 105 if (var->bits_per_pixel > 4) 106 return -EINVAL; 107 108 return 0; 109} 110 111/* 112 * Set the hardware state. 113 */ 114static int 115clps7111fb_set_par(struct fb_info *info) 116{ 117 unsigned int lcdcon, syscon, pixclock; 118 119 switch (info->var.bits_per_pixel) { 120 case 1: 121 info->fix.visual = FB_VISUAL_MONO01; 122 break; 123 case 2: 124 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 125 break; 126 case 4: 127 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 128 break; 129 } 130 131 info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8; 132 133 lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1; 134 lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13; 135 lcdcon |= lcd_ac_prescale << 25; 136 137 /* 138 * Calculate pixel prescale value from the pixclock. This is: 139 * 36.864MHz / pixclock_mhz - 1. 140 * However, pixclock is in picoseconds, so this ends up being: 141 * 36864000 * pixclock_ps / 10^12 - 1 142 * and this will overflow the 32-bit math. We perform this as 143 * (9 * 4096000 == 36864000): 144 * pixclock_ps * 9 * (4096000 / 10^12) - 1 145 */ 146 pixclock = 9 * info->var.pixclock / 244140 - 1; 147 lcdcon |= pixclock << 19; 148 149 if (info->var.bits_per_pixel == 4) 150 lcdcon |= LCDCON_GSMD; 151 if (info->var.bits_per_pixel >= 2) 152 lcdcon |= LCDCON_GSEN; 153 154 /* 155 * LCDCON must only be changed while the LCD is disabled 156 */ 157 syscon = clps_readl(SYSCON1); 158 clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1); 159 clps_writel(lcdcon, LCDCON); 160 clps_writel(syscon | SYSCON1_LCDEN, SYSCON1); 161 return 0; 162} 163 164static int clps7111fb_blank(int blank, struct fb_info *info) 165{ 166 if (blank) { 167 if (machine_is_edb7211()) { 168 /* Turn off the LCD backlight. */ 169 clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR); 170 171 /* Power off the LCD DC-DC converter. */ 172 clps_writeb(clps_readb(PDDR) & ~EDB_PD1_LCD_DC_DC_EN, PDDR); 173 174 /* Delay for a little while (half a second). */ 175 udelay(100); 176 177 /* Power off the LCD panel. */ 178 clps_writeb(clps_readb(PDDR) & ~EDB_PD2_LCDEN, PDDR); 179 180 /* Power off the LCD controller. */ 181 clps_writel(clps_readl(SYSCON1) & ~SYSCON1_LCDEN, 182 SYSCON1); 183 } 184 } else { 185 if (machine_is_edb7211()) { 186 /* Power up the LCD controller. */ 187 clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN, 188 SYSCON1); 189 190 /* Power up the LCD panel. */ 191 clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); 192 193 /* Delay for a little while. */ 194 udelay(100); 195 196 /* Power up the LCD DC-DC converter. */ 197 clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, 198 PDDR); 199 200 /* Turn on the LCD backlight. */ 201 clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); 202 } 203 } 204 return 0; 205} 206 207static struct fb_ops clps7111fb_ops = { 208 .owner = THIS_MODULE, 209 .fb_check_var = clps7111fb_check_var, 210 .fb_set_par = clps7111fb_set_par, 211 .fb_setcolreg = clps7111fb_setcolreg, 212 .fb_blank = clps7111fb_blank, 213 .fb_fillrect = cfb_fillrect, 214 .fb_copyarea = cfb_copyarea, 215 .fb_imageblit = cfb_imageblit, 216}; 217 218static int backlight_proc_show(struct seq_file *m, void *v) 219{ 220 if (machine_is_edb7211()) { 221 seq_printf(m, "%d\n", 222 (clps_readb(PDDR) & EDB_PD3_LCDBL) ? 1 : 0); 223 } 224 225 return 0; 226} 227 228static int backlight_proc_open(struct inode *inode, struct file *file) 229{ 230 return single_open(file, backlight_proc_show, NULL); 231} 232 233static ssize_t backlight_proc_write(struct file *file, const char *buffer, 234 size_t count, loff_t *pos) 235{ 236 unsigned char char_value; 237 int value; 238 239 if (count < 1) { 240 return -EINVAL; 241 } 242 243 if (copy_from_user(&char_value, buffer, 1)) 244 return -EFAULT; 245 246 value = char_value - '0'; 247 248 if (machine_is_edb7211()) { 249 unsigned char port_d; 250 251 port_d = clps_readb(PDDR); 252 253 if (value) { 254 port_d |= EDB_PD3_LCDBL; 255 } else { 256 port_d &= ~EDB_PD3_LCDBL; 257 } 258 259 clps_writeb(port_d, PDDR); 260 } 261 262 return count; 263} 264 265static const struct file_operations backlight_proc_fops = { 266 .owner = THIS_MODULE, 267 .open = backlight_proc_open, 268 .read = seq_read, 269 .llseek = seq_lseek, 270 .release = single_release, 271 .write = backlight_proc_write, 272}; 273 274static void __init clps711x_guess_lcd_params(struct fb_info *info) 275{ 276 unsigned int lcdcon, syscon, size; 277 unsigned long phys_base = PAGE_OFFSET; 278 void *virt_base = (void *)PAGE_OFFSET; 279 280 info->var.xres_virtual = 640; 281 info->var.yres_virtual = 240; 282 info->var.bits_per_pixel = 4; 283 info->var.activate = FB_ACTIVATE_NOW; 284 info->var.height = -1; 285 info->var.width = -1; 286 info->var.pixclock = 93006; /* 10.752MHz pixel clock */ 287 288 /* 289 * If the LCD controller is already running, decode the values 290 * in LCDCON to xres/yres/bpp/pixclock/acprescale 291 */ 292 syscon = clps_readl(SYSCON1); 293 if (syscon & SYSCON1_LCDEN) { 294 lcdcon = clps_readl(LCDCON); 295 296 /* 297 * Decode GSMD and GSEN bits to bits per pixel 298 */ 299 switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) { 300 case LCDCON_GSMD | LCDCON_GSEN: 301 info->var.bits_per_pixel = 4; 302 break; 303 304 case LCDCON_GSEN: 305 info->var.bits_per_pixel = 2; 306 break; 307 308 default: 309 info->var.bits_per_pixel = 1; 310 break; 311 } 312 313 /* 314 * Decode xres/yres 315 */ 316 info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16; 317 info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) / 318 (info->var.xres_virtual * 319 info->var.bits_per_pixel); 320 321 /* 322 * Calculate pixclock 323 */ 324 info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9; 325 326 /* 327 * Grab AC prescale 328 */ 329 lcd_ac_prescale = (lcdcon >> 25) & 0x1f; 330 } 331 332 info->var.xres = info->var.xres_virtual; 333 info->var.yres = info->var.yres_virtual; 334 info->var.grayscale = info->var.bits_per_pixel > 1; 335 336 size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8; 337 338 /* 339 * Might be worth checking to see if we can use the on-board 340 * RAM if size here... 341 * CLPS7110 - no on-board SRAM 342 * EP7212 - 38400 bytes 343 */ 344 if (size <= 38400) { 345 printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n"); 346 } 347 348 if ((syscon & SYSCON1_LCDEN) == 0) { 349 /* 350 * The display isn't running. Ensure that 351 * the display memory is empty. 352 */ 353 memset(virt_base, 0, size); 354 } 355 356 info->screen_base = virt_base; 357 info->fix.smem_start = phys_base; 358 info->fix.smem_len = PAGE_ALIGN(size); 359 info->fix.type = FB_TYPE_PACKED_PIXELS; 360} 361 362int __init clps711xfb_init(void) 363{ 364 int err = -ENOMEM; 365 366 if (fb_get_options("clps711xfb", NULL)) 367 return -ENODEV; 368 369 cfb = kzalloc(sizeof(*cfb), GFP_KERNEL); 370 if (!cfb) 371 goto out; 372 373 strcpy(cfb->fix.id, "clps711x"); 374 375 cfb->fbops = &clps7111fb_ops; 376 cfb->flags = FBINFO_DEFAULT; 377 378 clps711x_guess_lcd_params(cfb); 379 380 fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0); 381 382 if (!proc_create("backlight", 0444, NULL, &backlight_proc_fops)) { 383 printk("Couldn't create the /proc entry for the backlight.\n"); 384 return -EINVAL; 385 } 386 387 /* 388 * Power up the LCD 389 */ 390 if (machine_is_p720t()) { 391 PLD_LCDEN = PLD_LCDEN_EN; 392 PLD_PWR |= (PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); 393 } 394 395 if (machine_is_edb7211()) { 396 /* Power up the LCD panel. */ 397 clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR); 398 399 /* Delay for a little while. */ 400 udelay(100); 401 402 /* Power up the LCD DC-DC converter. */ 403 clps_writeb(clps_readb(PDDR) | EDB_PD1_LCD_DC_DC_EN, PDDR); 404 405 /* Turn on the LCD backlight. */ 406 clps_writeb(clps_readb(PDDR) | EDB_PD3_LCDBL, PDDR); 407 } 408 409 err = register_framebuffer(cfb); 410 411out: return err; 412} 413 414static void __exit clps711xfb_exit(void) 415{ 416 unregister_framebuffer(cfb); 417 kfree(cfb); 418 419 /* 420 * Power down the LCD 421 */ 422 if (machine_is_p720t()) { 423 PLD_LCDEN = 0; 424 PLD_PWR &= ~(PLD_S4_ON|PLD_S3_ON|PLD_S2_ON|PLD_S1_ON); 425 } 426} 427 428module_init(clps711xfb_init); 429module_exit(clps711xfb_exit); 430 431MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 432MODULE_DESCRIPTION("CLPS711x framebuffer driver"); 433MODULE_LICENSE("GPL"); 434