firmware/target/arm/ipod/lcd-gray.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Rockbox driver for iPod LCDs
  11  *
  12  * Based on code from the ipodlinux project - http://ipodlinux.org/
  13  * Adapted for Rockbox in November 2005
  14  *
  15  * Original file: linux/arch/armnommu/mach-ipod/fb.c
  16  *
  17  * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org)
  18  *
  19  * All files in this archive are subject to the GNU General Public License.
  20  * See the file COPYING in the source tree root for full license agreement.
  21  *
  22  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  23  * KIND, either express or implied.
  24  *
  25  ****************************************************************************/
  26 #include "config.h"
  27 #include "cpu.h"
  28 #include "lcd.h"
  29 #include "kernel.h"
  30 #include "system.h"
  31 #include "hwcompat.h"
  32
  33 /* LCD command codes for HD66753 */
  34
  35 #define R_START_OSC             0x00
  36 #define R_DRV_OUTPUT_CONTROL    0x01
  37 #define R_DRV_WAVEFORM_CONTROL  0x02
  38 #define R_POWER_CONTROL         0x03
  39 #define R_CONTRAST_CONTROL      0x04
  40 #define R_ENTRY_MODE            0x05
  41 #define R_ROTATION              0x06
  42 #define R_DISPLAY_CONTROL       0x07
  43 #define R_CURSOR_CONTROL        0x08
  44 #define R_HORIZONTAL_CURSOR_POS 0x0b
  45 #define R_VERTICAL_CURSOR_POS   0x0c
  46 #define R_1ST_SCR_DRV_POS       0x0d
  47 #define R_2ND_SCR_DRV_POS       0x0e
  48 #define R_RAM_WRITE_MASK        0x10
  49 #define R_RAM_ADDR_SET          0x11
  50 #define R_RAM_DATA              0x12
  51
  52 #ifdef HAVE_BACKLIGHT_INVERSION
  53 /* The backlight makes the LCD appear negative on the 1st/2nd gen */
  54 static bool lcd_inverted = false;
  55 static bool lcd_backlit = false;
  56 static void invert_display(void);
  57 #endif
  58
  59 #if defined(IPOD_1G2G) || defined(IPOD_3G)
  60 static unsigned short power_reg_h;
  61 #define POWER_REG_H power_reg_h
  62 #else
  63 #define POWER_REG_H 0x1200
  64 #endif
  65
  66 #ifdef IPOD_1G2G
  67 static unsigned short contrast_reg_h;
  68 #define CONTRAST_REG_H contrast_reg_h
  69 #else
  70 #define CONTRAST_REG_H 0x400
  71 #endif
  72
  73 /* needed for flip */
  74 static int addr_offset;
  75 #if defined(IPOD_MINI) || defined(IPOD_MINI2G)
  76 static int pix_offset;
  77 #endif
  78
  79 static const unsigned char dibits[16] ICONST_ATTR = {
  80     0x00, 0x03, 0x0C, 0x0F, 0x30, 0x33, 0x3C, 0x3F,
  81     0xC0, 0xC3, 0xCC, 0xCF, 0xF0, 0xF3, 0xFC, 0xFF
  82 };
  83
  84 /* wait for LCD with timeout */
  85 static inline void lcd_wait_write(void)
  86 {
  87     while (LCD1_BASE & LCD1_BUSY_MASK);
  88 }
  89
  90 /* send LCD data */
  91 #if CONFIG_CPU == PP5002
  92 STATICIRAM void ICODE_ATTR lcd_send_data(unsigned data)
  93 #else
  94 static void lcd_send_data(unsigned data)
  95 #endif
  96 {
  97     lcd_wait_write();
  98 #ifdef IPOD_MINI2G
  99     LCD1_CMD = data | 0x760000;
 100 #else
 101     LCD1_DATA = data >> 8;
 102     lcd_wait_write();
 103     LCD1_DATA = data & 0xff;
 104 #endif
 105 }
 106
 107 /* send LCD command */
 108 static void lcd_prepare_cmd(unsigned cmd)
 109 {
 110     lcd_wait_write();
 111 #ifdef IPOD_MINI2G
 112     LCD1_CMD = cmd | 0x740000;
 113 #else
 114     LCD1_CMD = 0;
 115     lcd_wait_write();
 116     LCD1_CMD = cmd;
 117 #endif
 118 }
 119
 120 /* send LCD command and data */
 121 static void lcd_cmd_and_data(unsigned cmd, unsigned data)
 122 {
 123     lcd_prepare_cmd(cmd);
 124     lcd_send_data(data);
 125 }
 126
 127 /* LCD init */
 128 void lcd_init_device(void)
 129 {
 130 #ifdef IPOD_1G2G
 131     if ((IPOD_HW_REVISION >> 16) == 1)
 132     {
 133         power_reg_h = 0x1500;
 134         contrast_reg_h = 0x700;
 135     }
 136     else /* 2nd gen */
 137     {
 138         if (inl(0xcf00404c) & 0x01) /* check bit 0 */
 139         {
 140             power_reg_h = 0x1520;   /* Set step-up frequency to f/8 instead of
 141                                      * f/32, for better blacklevel stability */
 142             contrast_reg_h = 0x400;
 143         }
 144         else
 145         {
 146             power_reg_h = 0x1100;
 147             contrast_reg_h = 0x300;
 148         }
 149     }
 150 #elif defined IPOD_3G
 151     if (inl(0xcf00404c) & 0x01) /* check bit 0 */
 152         power_reg_h = 0x1520;   /* Set step-up frequency to f/8 instead of
 153                                  * f/32, for better blacklevel stability */
 154     else
 155         power_reg_h = 0x1100;
 156 #elif defined IPOD_MINI2G
 157     lcd_wait_write();
 158     LCD1_BASE = (LCD1_BASE & ~0x1f00000) | 0x1700000;
 159 #endif
 160
 161     lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0xc);
 162 #ifdef HAVE_BACKLIGHT_INVERSION
 163     invert_display();
 164 #else
 165     lcd_cmd_and_data(R_DISPLAY_CONTROL, 0x0015);
 166 #endif
 167     lcd_set_flip(false);
 168     lcd_cmd_and_data(R_ENTRY_MODE, 0x0000);
 169
 170 #ifdef IPOD_4G
 171     GPIOB_ENABLE |= 0x4; /* B02 enable */
 172     GPIOB_ENABLE |= 0x8; /* B03 enable */
 173     outl(inl(0x70000084) | 0x2000000, 0x70000084); /* D01 enable */
 174     outl(inl(0x70000080) | 0x2000000, 0x70000080); /* D01 =1 */
 175
 176     DEV_EN |= 0x20000;   /* PWM enable */
 177 #endif
 178 }
 179
 180 /*** hardware configuration ***/
 181
 182 int lcd_default_contrast(void)
 183 {
 184 #ifdef IPOD_1G2G
 185     return 28;
 186 #elif defined(IPOD_MINI) || defined(IPOD_MINI2G) || defined(IPOD_3G)
 187     return 42;
 188 #elif defined(IPOD_4G)
 189     return 35;
 190 #endif
 191 }
 192
 193 /* Rockbox stores the contrast as 0..63 - we add 64 to it */
 194 void lcd_set_contrast(int val)
 195 {
 196     if (val < 0) val = 0;
 197     else if (val > 63) val = 63;
 198
 199     lcd_cmd_and_data(R_CONTRAST_CONTROL, CONTRAST_REG_H | (val + 64));
 200 }
 201
 202 #ifdef HAVE_BACKLIGHT_INVERSION
 203 static void invert_display(void)
 204 {
 205     if (lcd_inverted ^ lcd_backlit)
 206         lcd_cmd_and_data(R_DISPLAY_CONTROL, 0x0017);
 207     else
 208         lcd_cmd_and_data(R_DISPLAY_CONTROL, 0x0015);
 209 }
 210
 211 void lcd_set_invert_display(bool yesno)
 212 {
 213     lcd_inverted = yesno;
 214     invert_display();
 215 }
 216
 217 void lcd_set_backlight_inversion(bool yesno)
 218 {
 219     lcd_backlit = yesno;
 220     invert_display();
 221 }
 222 #else
 223 void lcd_set_invert_display(bool yesno)
 224 {
 225     if (yesno)
 226         lcd_cmd_and_data(R_DISPLAY_CONTROL, 0x0017);
 227     else
 228         lcd_cmd_and_data(R_DISPLAY_CONTROL, 0x0015);
 229 }
 230 #endif
 231
 232 /* turn the display upside down (call lcd_update() afterwards) */
 233 void lcd_set_flip(bool yesno)
 234 {
 235 #if defined(IPOD_MINI) || defined(IPOD_MINI2G)
 236     if (yesno) {
 237          /* 168x112, inverse COM order */
 238         lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x020d);
 239         lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x8316);    /* 22..131 */
 240         addr_offset = (22 << 5) | (20 - 4);
 241         pix_offset = -2;
 242     } else {
 243         /* 168x112,  inverse SEG order */
 244         lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x010d);
 245         lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x6d00);    /* 0..109 */
 246         addr_offset = 20;
 247         pix_offset = 0;
 248     }
 249 #else
 250     if (yesno) {
 251         /* 168x128, inverse SEG & COM order */
 252         lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x030f);
 253         lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x8304);    /* 4..131 */
 254         addr_offset = (4 << 5) | (20 - 1);
 255     } else {
 256         /* 168x128 */
 257         lcd_cmd_and_data(R_DRV_OUTPUT_CONTROL, 0x000f);
 258         lcd_cmd_and_data(R_1ST_SCR_DRV_POS, 0x7f00);    /* 0..127 */
 259         addr_offset = 20;
 260     }
 261 #endif
 262 }
 263
 264 void lcd_enable(bool on)
 265 {
 266     if (on)
 267     {
 268         lcd_cmd_and_data(R_START_OSC, 1);               /* start oscillation */
 269         sleep(HZ/10);                                           /* wait 10ms */
 270         lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H); /*clear standby mode */
 271         lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0xc);
 272                                                    /* enable opamp & booster */
 273     }
 274     else
 275     {
 276         lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H);
 277                                                /* switch off opamp & booster */
 278         lcd_cmd_and_data(R_POWER_CONTROL, POWER_REG_H | 0x1);
 279                                                        /* enter standby mode */
 280     }
 281 }
 282
 283 /*** update functions ***/
 284
 285 /* Performance function that works with an external buffer
 286    note that x, bwidtht and stride are in 8-pixel units! */
 287 void lcd_blit(const unsigned char* data, int bx, int y, int bwidth,
 288               int height, int stride)
 289 {
 290     const unsigned char *src, *src_end;
 291
 292     while (height--) {
 293         src = data;
 294         src_end = data + bwidth;
 295         lcd_cmd_and_data(R_RAM_ADDR_SET, (y++ << 5) + addr_offset - bx);
 296         lcd_prepare_cmd(R_RAM_DATA);
 297         do {
 298             unsigned byte = *src++;
 299             lcd_send_data((dibits[byte>>4] << 8) | dibits[byte&0x0f]);
 300         } while (src < src_end);
 301         data += stride;
 302     }
 303 }
 304
 305 void lcd_update_rect(int x, int y, int width, int height)
 306 {
 307     int xmax, ymax;
 308
 309     if (x + width > LCD_WIDTH)
 310         width = LCD_WIDTH - x;
 311     if (width <= 0)
 312         return;
 313
 314     ymax = y + height - 1;
 315     if (ymax >= LCD_HEIGHT)
 316         ymax = LCD_HEIGHT - 1;
 317
 318 #if defined(IPOD_MINI) || defined(IPOD_MINI2G)
 319     x += pix_offset;
 320 #endif
 321      /* writing is done in 16-bit units (8 pixels) */
 322     xmax = (x + width - 1) >> 3;
 323     x >>= 3;
 324     width = xmax - x + 1;
 325
 326     for (; y <= ymax; y++) {
 327         unsigned char *data, *data_end;
 328
 329         lcd_cmd_and_data(R_RAM_ADDR_SET, (y << 5) + addr_offset - x);
 330         lcd_prepare_cmd(R_RAM_DATA);
 331
 332         data = &lcd_framebuffer[y][2*x];
 333         data_end = data + 2 * width;
 334 #if defined(IPOD_MINI) || defined(IPOD_MINI2G)
 335         if (pix_offset == -2) {
 336             unsigned cur_word = *data++;
 337             do {
 338                 cur_word = (cur_word << 8) | *data++;
 339                 cur_word = (cur_word << 8) | *data++;
 340                 lcd_send_data((cur_word >> 4) & 0xffff);
 341             } while (data <= data_end);
 342         } else
 343 #endif
 344         {
 345             do {
 346                 unsigned highbyte = *data++;
 347                 lcd_send_data((highbyte << 8) | *data++);
 348             } while (data < data_end);
 349         }
 350     }
 351 }
 352
 353 /* Update the display. */
 354 void lcd_update(void)
 355 {
 356     lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
 357 }
 358
 359 #ifdef HAVE_LCD_SHUTDOWN
 360 /* LCD powerdown */
 361 void lcd_shutdown(void)
 362 {
 363     lcd_cmd_and_data(R_POWER_CONTROL, 0x1500); /* Turn off op amp power */
 364     lcd_cmd_and_data(R_POWER_CONTROL, 0x1502); /* Put LCD driver in standby */
 365 }
 366 #endif