drivers/video/fbdev/dnfb.c

   1 #include <linux/kernel.h>
   2 #include <linux/errno.h>
   3 #include <linux/string.h>
   4 #include <linux/mm.h>
   5 #include <linux/delay.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/platform_device.h>
   8
   9 #include <asm/setup.h>
  10 #include <asm/irq.h>
  11 #include <asm/amigahw.h>
  12 #include <asm/amigaints.h>
  13 #include <asm/apollohw.h>
  14 #include <linux/fb.h>
  15 #include <linux/module.h>
  16
  17 /* apollo video HW definitions */
  18
  19 /*
  20  * Control Registers.   IOBASE + $x
  21  *
  22  * Note: these are the Memory/IO BASE definitions for a mono card set to the
  23  * alternate address
  24  *
  25  * Control 3A and 3B serve identical functions except that 3A
  26  * deals with control 1 and 3b deals with Color LUT reg.
  27  */
  28
  29 #define AP_IOBASE       0x3b0   /* Base address of 1 plane board. */
  30 #define AP_STATUS       isaIO2mem(AP_IOBASE+0)  /* Status register.  Read */
  31 #define AP_WRITE_ENABLE isaIO2mem(AP_IOBASE+0)  /* Write Enable Register Write */
  32 #define AP_DEVICE_ID    isaIO2mem(AP_IOBASE+1)  /* Device ID Register. Read */
  33 #define AP_ROP_1        isaIO2mem(AP_IOBASE+2)  /* Raster Operation reg. Write Word */
  34 #define AP_DIAG_MEM_REQ isaIO2mem(AP_IOBASE+4)  /* Diagnostic Memory Request. Write Word */
  35 #define AP_CONTROL_0    isaIO2mem(AP_IOBASE+8)  /* Control Register 0.  Read/Write */
  36 #define AP_CONTROL_1    isaIO2mem(AP_IOBASE+0xa)        /* Control Register 1.  Read/Write */
  37 #define AP_CONTROL_3A   isaIO2mem(AP_IOBASE+0xe)        /* Control Register 3a. Read/Write */
  38 #define AP_CONTROL_2    isaIO2mem(AP_IOBASE+0xc)        /* Control Register 2. Read/Write */
  39
  40
  41 #define FRAME_BUFFER_START 0x0FA0000
  42 #define FRAME_BUFFER_LEN 0x40000
  43
  44 /* CREG 0 */
  45 #define VECTOR_MODE 0x40        /* 010x.xxxx */
  46 #define DBLT_MODE   0x80        /* 100x.xxxx */
  47 #define NORMAL_MODE 0xE0        /* 111x.xxxx */
  48 #define SHIFT_BITS  0x1F        /* xxx1.1111 */
  49         /* other bits are Shift value */
  50
  51 /* CREG 1 */
  52 #define AD_BLT      0x80        /* 1xxx.xxxx */
  53 #define NORMAL      0x80 /* 1xxx.xxxx */        /* What is happening here ?? */
  54 #define INVERSE     0x00 /* 0xxx.xxxx */        /* Clearing this reverses the screen */
  55 #define PIX_BLT     0x00        /* 0xxx.xxxx */
  56
  57 #define AD_HIBIT        0x40    /* xIxx.xxxx */
  58
  59 #define ROP_EN          0x10    /* xxx1.xxxx */
  60 #define DST_EQ_SRC      0x00    /* xxx0.xxxx */
  61 #define nRESET_SYNC     0x08    /* xxxx.1xxx */
  62 #define SYNC_ENAB       0x02    /* xxxx.xx1x */
  63
  64 #define BLANK_DISP      0x00    /* xxxx.xxx0 */
  65 #define ENAB_DISP       0x01    /* xxxx.xxx1 */
  66
  67 #define NORM_CREG1      (nRESET_SYNC | SYNC_ENAB | ENAB_DISP)   /* no reset sync */
  68
  69 /* CREG 2 */
  70
  71 /*
  72  * Following 3 defines are common to 1, 4 and 8 plane.
  73  */
  74
  75 #define S_DATA_1s   0x00 /* 00xx.xxxx */        /* set source to all 1's -- vector drawing */
  76 #define S_DATA_PIX  0x40 /* 01xx.xxxx */        /* takes source from ls-bits and replicates over 16 bits */
  77 #define S_DATA_PLN  0xC0 /* 11xx.xxxx */        /* normal, each data access =16-bits in
  78                                                    one plane of image mem */
  79
  80 /* CREG 3A/CREG 3B */
  81 #       define RESET_CREG 0x80  /* 1000.0000 */
  82
  83 /* ROP REG  -  all one nibble */
  84 /*      ********* NOTE : this is used r0,r1,r2,r3 *********** */
  85 #define ROP(r2,r3,r0,r1) ( (U_SHORT)((r0)|((r1)<<4)|((r2)<<8)|((r3)<<12)) )
  86 #define DEST_ZERO               0x0
  87 #define SRC_AND_DEST    0x1
  88 #define SRC_AND_nDEST   0x2
  89 #define SRC                             0x3
  90 #define nSRC_AND_DEST   0x4
  91 #define DEST                    0x5
  92 #define SRC_XOR_DEST    0x6
  93 #define SRC_OR_DEST             0x7
  94 #define SRC_NOR_DEST    0x8
  95 #define SRC_XNOR_DEST   0x9
  96 #define nDEST                   0xA
  97 #define SRC_OR_nDEST    0xB
  98 #define nSRC                    0xC
  99 #define nSRC_OR_DEST    0xD
 100 #define SRC_NAND_DEST   0xE
 101 #define DEST_ONE                0xF
 102
 103 #define SWAP(A) ((A>>8) | ((A&0xff) <<8))
 104
 105 /* frame buffer operations */
 106
 107 static int dnfb_blank(int blank, struct fb_info *info);
 108 static void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
 109
 110 static struct fb_ops dn_fb_ops = {
 111         .owner          = THIS_MODULE,
 112         .fb_blank       = dnfb_blank,
 113         .fb_fillrect    = cfb_fillrect,
 114         .fb_copyarea    = dnfb_copyarea,
 115         .fb_imageblit   = cfb_imageblit,
 116 };
 117
 118 static const struct fb_var_screeninfo dnfb_var = {
 119         .xres           = 1280,
 120         .yres           = 1024,
 121         .xres_virtual   = 2048,
 122         .yres_virtual   = 1024,
 123         .bits_per_pixel = 1,
 124         .height         = -1,
 125         .width          = -1,
 126         .vmode          = FB_VMODE_NONINTERLACED,
 127 };
 128
 129 static const struct fb_fix_screeninfo dnfb_fix = {
 130         .id             = "Apollo Mono",
 131         .smem_start     = (FRAME_BUFFER_START + IO_BASE),
 132         .smem_len       = FRAME_BUFFER_LEN,
 133         .type           = FB_TYPE_PACKED_PIXELS,
 134         .visual         = FB_VISUAL_MONO10,
 135         .line_length    = 256,
 136 };
 137
 138 static int dnfb_blank(int blank, struct fb_info *info)
 139 {
 140         if (blank)
 141                 out_8(AP_CONTROL_3A, 0x0);
 142         else
 143                 out_8(AP_CONTROL_3A, 0x1);
 144         return 0;
 145 }
 146
 147 static
 148 void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
 149 {
 150
 151         int incr, y_delta, pre_read = 0, x_end, x_word_count;
 152         uint start_mask, end_mask, dest;
 153         ushort *src, dummy;
 154         short i, j;
 155
 156         incr = (area->dy <= area->sy) ? 1 : -1;
 157
 158         src = (ushort *)(info->screen_base + area->sy * info->fix.line_length +
 159                         (area->sx >> 4));
 160         dest = area->dy * (info->fix.line_length >> 1) + (area->dx >> 4);
 161
 162         if (incr > 0) {
 163                 y_delta = (info->fix.line_length * 8) - area->sx - area->width;
 164                 x_end = area->dx + area->width - 1;
 165                 x_word_count = (x_end >> 4) - (area->dx >> 4) + 1;
 166                 start_mask = 0xffff0000 >> (area->dx & 0xf);
 167                 end_mask = 0x7ffff >> (x_end & 0xf);
 168                 out_8(AP_CONTROL_0,
 169                      (((area->dx & 0xf) - (area->sx & 0xf)) % 16) | (0x4 << 5));
 170                 if ((area->dx & 0xf) < (area->sx & 0xf))
 171                         pre_read = 1;
 172         } else {
 173                 y_delta = -((info->fix.line_length * 8) - area->sx - area->width);
 174                 x_end = area->dx - area->width + 1;
 175                 x_word_count = (area->dx >> 4) - (x_end >> 4) + 1;
 176                 start_mask = 0x7ffff >> (area->dx & 0xf);
 177                 end_mask = 0xffff0000 >> (x_end & 0xf);
 178                 out_8(AP_CONTROL_0,
 179                      ((-((area->sx & 0xf) - (area->dx & 0xf))) % 16) |
 180                      (0x4 << 5));
 181                 if ((area->dx & 0xf) > (area->sx & 0xf))
 182                         pre_read = 1;
 183         }
 184
 185         for (i = 0; i < area->height; i++) {
 186
 187                 out_8(AP_CONTROL_3A, 0xc | (dest >> 16));
 188
 189                 if (pre_read) {
 190                         dummy = *src;
 191                         src += incr;
 192                 }
 193
 194                 if (x_word_count) {
 195                         out_8(AP_WRITE_ENABLE, start_mask);
 196                         *src = dest;
 197                         src += incr;
 198                         dest += incr;
 199                         out_8(AP_WRITE_ENABLE, 0);
 200
 201                         for (j = 1; j < (x_word_count - 1); j++) {
 202                                 *src = dest;
 203                                 src += incr;
 204                                 dest += incr;
 205                         }
 206
 207                         out_8(AP_WRITE_ENABLE, start_mask);
 208                         *src = dest;
 209                         dest += incr;
 210                         src += incr;
 211                 } else {
 212                         out_8(AP_WRITE_ENABLE, start_mask | end_mask);
 213                         *src = dest;
 214                         dest += incr;
 215                         src += incr;
 216                 }
 217                 src += (y_delta / 16);
 218                 dest += (y_delta / 16);
 219         }
 220         out_8(AP_CONTROL_0, NORMAL_MODE);
 221 }
 222
 223 /*
 224  * Initialization
 225  */
 226
 227 static int dnfb_probe(struct platform_device *dev)
 228 {
 229         struct fb_info *info;
 230         int err = 0;
 231
 232         info = framebuffer_alloc(0, &dev->dev);
 233         if (!info)
 234                 return -ENOMEM;
 235
 236         info->fbops = &dn_fb_ops;
 237         info->fix = dnfb_fix;
 238         info->var = dnfb_var;
 239         info->var.red.length = 1;
 240         info->var.red.offset = 0;
 241         info->var.green = info->var.blue = info->var.red;
 242         info->screen_base = (u_char *) info->fix.smem_start;
 243
 244         err = fb_alloc_cmap(&info->cmap, 2, 0);
 245         if (err < 0)
 246                 goto release_framebuffer;
 247
 248         err = register_framebuffer(info);
 249         if (err < 0) {
 250                 fb_dealloc_cmap(&info->cmap);
 251                 goto release_framebuffer;
 252         }
 253         platform_set_drvdata(dev, info);
 254
 255         /* now we have registered we can safely setup the hardware */
 256         out_8(AP_CONTROL_3A, RESET_CREG);
 257         out_be16(AP_WRITE_ENABLE, 0x0);
 258         out_8(AP_CONTROL_0, NORMAL_MODE);
 259         out_8(AP_CONTROL_1, (AD_BLT | DST_EQ_SRC | NORM_CREG1));
 260         out_8(AP_CONTROL_2, S_DATA_PLN);
 261         out_be16(AP_ROP_1, SWAP(0x3));
 262
 263         printk("apollo frame buffer alive and kicking !\n");
 264         return err;
 265
 266 release_framebuffer:
 267         framebuffer_release(info);
 268         return err;
 269 }
 270
 271 static struct platform_driver dnfb_driver = {
 272         .probe  = dnfb_probe,
 273         .driver = {
 274                 .name   = "dnfb",
 275         },
 276 };
 277
 278 static struct platform_device dnfb_device = {
 279         .name   = "dnfb",
 280 };
 281
 282 int __init dnfb_init(void)
 283 {
 284         int ret;
 285
 286         if (!MACH_IS_APOLLO)
 287                 return -ENODEV;
 288
 289         if (fb_get_options("dnfb", NULL))
 290                 return -ENODEV;
 291
 292         ret = platform_driver_register(&dnfb_driver);
 293
 294         if (!ret) {
 295                 ret = platform_device_register(&dnfb_device);
 296                 if (ret)
 297                         platform_driver_unregister(&dnfb_driver);
 298         }
 299         return ret;
 300 }
 301
 302 module_init(dnfb_init);
 303
 304 MODULE_LICENSE("GPL");