root/include/linux/amba/clcd.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. clcdfb_decode
  2. clcdfb_check

   1 /*
   2  * linux/include/asm-arm/hardware/amba_clcd.h -- Integrator LCD panel.
   3  *
   4  * David A Rusling
   5  *
   6  * Copyright (C) 2001 ARM Limited
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive
  10  * for more details.
  11  */
  12 #include <linux/fb.h>
  13 #include <linux/amba/clcd-regs.h>
  14 
  15 enum {
  16         /* individual formats */
  17         CLCD_CAP_RGB444         = (1 << 0),
  18         CLCD_CAP_RGB5551        = (1 << 1),
  19         CLCD_CAP_RGB565         = (1 << 2),
  20         CLCD_CAP_RGB888         = (1 << 3),
  21         CLCD_CAP_BGR444         = (1 << 4),
  22         CLCD_CAP_BGR5551        = (1 << 5),
  23         CLCD_CAP_BGR565         = (1 << 6),
  24         CLCD_CAP_BGR888         = (1 << 7),
  25 
  26         /* connection layouts */
  27         CLCD_CAP_444            = CLCD_CAP_RGB444 | CLCD_CAP_BGR444,
  28         CLCD_CAP_5551           = CLCD_CAP_RGB5551 | CLCD_CAP_BGR5551,
  29         CLCD_CAP_565            = CLCD_CAP_RGB565 | CLCD_CAP_BGR565,
  30         CLCD_CAP_888            = CLCD_CAP_RGB888 | CLCD_CAP_BGR888,
  31 
  32         /* red/blue ordering */
  33         CLCD_CAP_RGB            = CLCD_CAP_RGB444 | CLCD_CAP_RGB5551 |
  34                                   CLCD_CAP_RGB565 | CLCD_CAP_RGB888,
  35         CLCD_CAP_BGR            = CLCD_CAP_BGR444 | CLCD_CAP_BGR5551 |
  36                                   CLCD_CAP_BGR565 | CLCD_CAP_BGR888,
  37 
  38         CLCD_CAP_ALL            = CLCD_CAP_BGR | CLCD_CAP_RGB,
  39 };
  40 
  41 struct backlight_device;
  42 
  43 struct clcd_panel {
  44         struct fb_videomode     mode;
  45         signed short            width;  /* width in mm */
  46         signed short            height; /* height in mm */
  47         u32                     tim2;
  48         u32                     tim3;
  49         u32                     cntl;
  50         u32                     caps;
  51         unsigned int            bpp:8,
  52                                 fixedtimings:1,
  53                                 grayscale:1;
  54         unsigned int            connector;
  55         struct backlight_device *backlight;
  56         /*
  57          * If the B/R lines are switched between the CLCD
  58          * and the panel we need to know this and not try to
  59          * compensate with the BGR bit in the control register.
  60          */
  61         bool                    bgr_connection;
  62 };
  63 
  64 struct clcd_regs {
  65         u32                     tim0;
  66         u32                     tim1;
  67         u32                     tim2;
  68         u32                     tim3;
  69         u32                     cntl;
  70         unsigned long           pixclock;
  71 };
  72 
  73 struct clcd_fb;
  74 
  75 /*
  76  * the board-type specific routines
  77  */
  78 struct clcd_board {
  79         const char *name;
  80 
  81         /*
  82          * Optional.  Hardware capability flags.
  83          */
  84         u32     caps;
  85 
  86         /*
  87          * Optional.  Check whether the var structure is acceptable
  88          * for this display.
  89          */
  90         int     (*check)(struct clcd_fb *fb, struct fb_var_screeninfo *var);
  91 
  92         /*
  93          * Compulsory.  Decode fb->fb.var into regs->*.  In the case of
  94          * fixed timing, set regs->* to the register values required.
  95          */
  96         void    (*decode)(struct clcd_fb *fb, struct clcd_regs *regs);
  97 
  98         /*
  99          * Optional.  Disable any extra display hardware.
 100          */
 101         void    (*disable)(struct clcd_fb *);
 102 
 103         /*
 104          * Optional.  Enable any extra display hardware.
 105          */
 106         void    (*enable)(struct clcd_fb *);
 107 
 108         /*
 109          * Setup platform specific parts of CLCD driver
 110          */
 111         int     (*setup)(struct clcd_fb *);
 112 
 113         /*
 114          * mmap the framebuffer memory
 115          */
 116         int     (*mmap)(struct clcd_fb *, struct vm_area_struct *);
 117 
 118         /*
 119          * Remove platform specific parts of CLCD driver
 120          */
 121         void    (*remove)(struct clcd_fb *);
 122 };
 123 
 124 struct amba_device;
 125 struct clk;
 126 
 127 /* this data structure describes each frame buffer device we find */
 128 struct clcd_fb {
 129         struct fb_info          fb;
 130         struct amba_device      *dev;
 131         struct clk              *clk;
 132         struct clcd_panel       *panel;
 133         struct clcd_board       *board;
 134         void                    *board_data;
 135         void __iomem            *regs;
 136         u16                     off_ienb;
 137         u16                     off_cntl;
 138         u32                     clcd_cntl;
 139         u32                     cmap[16];
 140         bool                    clk_enabled;
 141 };
 142 
 143 static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
 144 {
 145         struct fb_var_screeninfo *var = &fb->fb.var;
 146         u32 val, cpl;
 147 
 148         /*
 149          * Program the CLCD controller registers and start the CLCD
 150          */
 151         val = ((var->xres / 16) - 1) << 2;
 152         val |= (var->hsync_len - 1) << 8;
 153         val |= (var->right_margin - 1) << 16;
 154         val |= (var->left_margin - 1) << 24;
 155         regs->tim0 = val;
 156 
 157         val = var->yres;
 158         if (fb->panel->cntl & CNTL_LCDDUAL)
 159                 val /= 2;
 160         val -= 1;
 161         val |= (var->vsync_len - 1) << 10;
 162         val |= var->lower_margin << 16;
 163         val |= var->upper_margin << 24;
 164         regs->tim1 = val;
 165 
 166         val = fb->panel->tim2;
 167         val |= var->sync & FB_SYNC_HOR_HIGH_ACT  ? 0 : TIM2_IHS;
 168         val |= var->sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
 169 
 170         cpl = var->xres_virtual;
 171         if (fb->panel->cntl & CNTL_LCDTFT)        /* TFT */
 172                 /* / 1 */;
 173         else if (!var->grayscale)                 /* STN color */
 174                 cpl = cpl * 8 / 3;
 175         else if (fb->panel->cntl & CNTL_LCDMONO8) /* STN monochrome, 8bit */
 176                 cpl /= 8;
 177         else                                      /* STN monochrome, 4bit */
 178                 cpl /= 4;
 179 
 180         regs->tim2 = val | ((cpl - 1) << 16);
 181 
 182         regs->tim3 = fb->panel->tim3;
 183 
 184         val = fb->panel->cntl;
 185         if (var->grayscale)
 186                 val |= CNTL_LCDBW;
 187 
 188         if (fb->panel->caps && fb->board->caps && var->bits_per_pixel >= 16) {
 189                 /*
 190                  * if board and panel supply capabilities, we can support
 191                  * changing BGR/RGB depending on supplied parameters. Here
 192                  * we switch to what the framebuffer is providing if need
 193                  * be, so if the framebuffer is BGR but the display connection
 194                  * is RGB (first case) we switch it around. Vice versa mutatis
 195                  * mutandis if the framebuffer is RGB but the display connection
 196                  * is BGR, we flip it around.
 197                  */
 198                 if (var->red.offset == 0)
 199                         val &= ~CNTL_BGR;
 200                 else
 201                         val |= CNTL_BGR;
 202                 if (fb->panel->bgr_connection)
 203                         val ^= CNTL_BGR;
 204         }
 205 
 206         switch (var->bits_per_pixel) {
 207         case 1:
 208                 val |= CNTL_LCDBPP1;
 209                 break;
 210         case 2:
 211                 val |= CNTL_LCDBPP2;
 212                 break;
 213         case 4:
 214                 val |= CNTL_LCDBPP4;
 215                 break;
 216         case 8:
 217                 val |= CNTL_LCDBPP8;
 218                 break;
 219         case 16:
 220                 /*
 221                  * PL110 cannot choose between 5551 and 565 modes in its
 222                  * control register.  It is possible to use 565 with
 223                  * custom external wiring.
 224                  */
 225                 if (amba_part(fb->dev) == 0x110 ||
 226                     var->green.length == 5)
 227                         val |= CNTL_LCDBPP16;
 228                 else if (var->green.length == 6)
 229                         val |= CNTL_LCDBPP16_565;
 230                 else
 231                         val |= CNTL_LCDBPP16_444;
 232                 break;
 233         case 32:
 234                 val |= CNTL_LCDBPP24;
 235                 break;
 236         }
 237 
 238         regs->cntl = val;
 239         regs->pixclock = var->pixclock;
 240 }
 241 
 242 static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var)
 243 {
 244         var->xres_virtual = var->xres = (var->xres + 15) & ~15;
 245         var->yres_virtual = var->yres = (var->yres + 1) & ~1;
 246 
 247 #define CHECK(e,l,h) (var->e < l || var->e > h)
 248         if (CHECK(right_margin, (5+1), 256) ||  /* back porch */
 249             CHECK(left_margin, (5+1), 256) ||   /* front porch */
 250             CHECK(hsync_len, (5+1), 256) ||
 251             var->xres > 4096 ||
 252             var->lower_margin > 255 ||          /* back porch */
 253             var->upper_margin > 255 ||          /* front porch */
 254             var->vsync_len > 32 ||
 255             var->yres > 1024)
 256                 return -EINVAL;
 257 #undef CHECK
 258 
 259         /* single panel mode: PCD = max(PCD, 1) */
 260         /* dual panel mode: PCD = max(PCD, 5) */
 261 
 262         /*
 263          * You can't change the grayscale setting, and
 264          * we can only do non-interlaced video.
 265          */
 266         if (var->grayscale != fb->fb.var.grayscale ||
 267             (var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
 268                 return -EINVAL;
 269 
 270 #define CHECK(e) (var->e != fb->fb.var.e)
 271         if (fb->panel->fixedtimings &&
 272             (CHECK(xres)                ||
 273              CHECK(yres)                ||
 274              CHECK(bits_per_pixel)      ||
 275              CHECK(pixclock)            ||
 276              CHECK(left_margin)         ||
 277              CHECK(right_margin)        ||
 278              CHECK(upper_margin)        ||
 279              CHECK(lower_margin)        ||
 280              CHECK(hsync_len)           ||
 281              CHECK(vsync_len)           ||
 282              CHECK(sync)))
 283                 return -EINVAL;
 284 #undef CHECK
 285 
 286         var->nonstd = 0;
 287         var->accel_flags = 0;
 288 
 289         return 0;
 290 }

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