drivers/video/fbdev/pmag-ba-fb.c

   1 /*
   2  *      linux/drivers/video/pmag-ba-fb.c
   3  *
   4  *      PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
   5  *      derived from:
   6  *      "HP300 Topcat framebuffer support (derived from macfb of all things)
   7  *      Phil Blundell <philb@gnu.org> 1998", the original code can be
   8  *      found in the file hpfb.c in the same directory.
   9  *
  10  *      Based on digital document:
  11  *      "PMAG-BA TURBOchannel Color Frame Buffer
  12  *       Functional Specification", Revision 1.2, August 27, 1990
  13  *
  14  *      DECstation related code Copyright (C) 1999, 2000, 2001 by
  15  *      Michael Engel <engel@unix-ag.org>,
  16  *      Karsten Merker <merker@linuxtag.org> and
  17  *      Harald Koerfgen.
  18  *      Copyright (c) 2005, 2006  Maciej W. Rozycki
  19  *      Copyright (c) 2005  James Simmons
  20  *
  21  *      This file is subject to the terms and conditions of the GNU General
  22  *      Public License.  See the file COPYING in the main directory of this
  23  *      archive for more details.
  24  */
  25
  26 #include <linux/compiler.h>
  27 #include <linux/errno.h>
  28 #include <linux/fb.h>
  29 #include <linux/init.h>
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/tc.h>
  33 #include <linux/types.h>
  34
  35 #include <asm/io.h>
  36
  37 #include <video/pmag-ba-fb.h>
  38
  39
  40 struct pmagbafb_par {
  41         volatile void __iomem *mmio;
  42         volatile u32 __iomem *dac;
  43 };
  44
  45
  46 static const struct fb_var_screeninfo pmagbafb_defined = {
  47         .xres           = 1024,
  48         .yres           = 864,
  49         .xres_virtual   = 1024,
  50         .yres_virtual   = 864,
  51         .bits_per_pixel = 8,
  52         .red.length     = 8,
  53         .green.length   = 8,
  54         .blue.length    = 8,
  55         .activate       = FB_ACTIVATE_NOW,
  56         .height         = -1,
  57         .width          = -1,
  58         .accel_flags    = FB_ACCEL_NONE,
  59         .pixclock       = 14452,
  60         .left_margin    = 116,
  61         .right_margin   = 12,
  62         .upper_margin   = 34,
  63         .lower_margin   = 0,
  64         .hsync_len      = 128,
  65         .vsync_len      = 3,
  66         .sync           = FB_SYNC_ON_GREEN,
  67         .vmode          = FB_VMODE_NONINTERLACED,
  68 };
  69
  70 static const struct fb_fix_screeninfo pmagbafb_fix = {
  71         .id             = "PMAG-BA",
  72         .smem_len       = (1024 * 1024),
  73         .type           = FB_TYPE_PACKED_PIXELS,
  74         .visual         = FB_VISUAL_PSEUDOCOLOR,
  75         .line_length    = 1024,
  76         .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,
  77 };
  78
  79
  80 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
  81 {
  82         writeb(v, par->dac + reg / 4);
  83 }
  84
  85 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
  86 {
  87         return readb(par->dac + reg / 4);
  88 }
  89
  90
  91 /*
  92  * Set the palette.
  93  */
  94 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
  95                               unsigned int green, unsigned int blue,
  96                               unsigned int transp, struct fb_info *info)
  97 {
  98         struct pmagbafb_par *par = info->par;
  99
 100         if (regno >= info->cmap.len)
 101                 return 1;
 102
 103         red   >>= 8;    /* The cmap fields are 16 bits    */
 104         green >>= 8;    /* wide, but the hardware colormap */
 105         blue  >>= 8;    /* registers are only 8 bits wide */
 106
 107         mb();
 108         dac_write(par, BT459_ADDR_LO, regno);
 109         dac_write(par, BT459_ADDR_HI, 0x00);
 110         wmb();
 111         dac_write(par, BT459_CMAP, red);
 112         wmb();
 113         dac_write(par, BT459_CMAP, green);
 114         wmb();
 115         dac_write(par, BT459_CMAP, blue);
 116
 117         return 0;
 118 }
 119
 120 static struct fb_ops pmagbafb_ops = {
 121         .owner          = THIS_MODULE,
 122         .fb_setcolreg   = pmagbafb_setcolreg,
 123         .fb_fillrect    = cfb_fillrect,
 124         .fb_copyarea    = cfb_copyarea,
 125         .fb_imageblit   = cfb_imageblit,
 126 };
 127
 128
 129 /*
 130  * Turn the hardware cursor off.
 131  */
 132 static void pmagbafb_erase_cursor(struct fb_info *info)
 133 {
 134         struct pmagbafb_par *par = info->par;
 135
 136         mb();
 137         dac_write(par, BT459_ADDR_LO, 0x00);
 138         dac_write(par, BT459_ADDR_HI, 0x03);
 139         wmb();
 140         dac_write(par, BT459_DATA, 0x00);
 141 }
 142
 143
 144 static int pmagbafb_probe(struct device *dev)
 145 {
 146         struct tc_dev *tdev = to_tc_dev(dev);
 147         resource_size_t start, len;
 148         struct fb_info *info;
 149         struct pmagbafb_par *par;
 150         int err;
 151
 152         info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
 153         if (!info) {
 154                 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
 155                 return -ENOMEM;
 156         }
 157
 158         par = info->par;
 159         dev_set_drvdata(dev, info);
 160
 161         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 162                 printk(KERN_ERR "%s: Cannot allocate color map\n",
 163                        dev_name(dev));
 164                 err = -ENOMEM;
 165                 goto err_alloc;
 166         }
 167
 168         info->fbops = &pmagbafb_ops;
 169         info->fix = pmagbafb_fix;
 170         info->var = pmagbafb_defined;
 171         info->flags = FBINFO_DEFAULT;
 172
 173         /* Request the I/O MEM resource.  */
 174         start = tdev->resource.start;
 175         len = tdev->resource.end - start + 1;
 176         if (!request_mem_region(start, len, dev_name(dev))) {
 177                 printk(KERN_ERR "%s: Cannot reserve FB region\n",
 178                        dev_name(dev));
 179                 err = -EBUSY;
 180                 goto err_cmap;
 181         }
 182
 183         /* MMIO mapping setup.  */
 184         info->fix.mmio_start = start;
 185         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
 186         if (!par->mmio) {
 187                 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
 188                 err = -ENOMEM;
 189                 goto err_resource;
 190         }
 191         par->dac = par->mmio + PMAG_BA_BT459;
 192
 193         /* Frame buffer mapping setup.  */
 194         info->fix.smem_start = start + PMAG_BA_FBMEM;
 195         info->screen_base = ioremap_nocache(info->fix.smem_start,
 196                                             info->fix.smem_len);
 197         if (!info->screen_base) {
 198                 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
 199                 err = -ENOMEM;
 200                 goto err_mmio_map;
 201         }
 202         info->screen_size = info->fix.smem_len;
 203
 204         pmagbafb_erase_cursor(info);
 205
 206         err = register_framebuffer(info);
 207         if (err < 0) {
 208                 printk(KERN_ERR "%s: Cannot register framebuffer\n",
 209                        dev_name(dev));
 210                 goto err_smem_map;
 211         }
 212
 213         get_device(dev);
 214
 215         fb_info(info, "%s frame buffer device at %s\n",
 216                 info->fix.id, dev_name(dev));
 217
 218         return 0;
 219
 220
 221 err_smem_map:
 222         iounmap(info->screen_base);
 223
 224 err_mmio_map:
 225         iounmap(par->mmio);
 226
 227 err_resource:
 228         release_mem_region(start, len);
 229
 230 err_cmap:
 231         fb_dealloc_cmap(&info->cmap);
 232
 233 err_alloc:
 234         framebuffer_release(info);
 235         return err;
 236 }
 237
 238 static int pmagbafb_remove(struct device *dev)
 239 {
 240         struct tc_dev *tdev = to_tc_dev(dev);
 241         struct fb_info *info = dev_get_drvdata(dev);
 242         struct pmagbafb_par *par = info->par;
 243         resource_size_t start, len;
 244
 245         put_device(dev);
 246         unregister_framebuffer(info);
 247         iounmap(info->screen_base);
 248         iounmap(par->mmio);
 249         start = tdev->resource.start;
 250         len = tdev->resource.end - start + 1;
 251         release_mem_region(start, len);
 252         fb_dealloc_cmap(&info->cmap);
 253         framebuffer_release(info);
 254         return 0;
 255 }
 256
 257
 258 /*
 259  * Initialize the framebuffer.
 260  */
 261 static const struct tc_device_id pmagbafb_tc_table[] = {
 262         { "DEC     ", "PMAG-BA " },
 263         { }
 264 };
 265 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
 266
 267 static struct tc_driver pmagbafb_driver = {
 268         .id_table       = pmagbafb_tc_table,
 269         .driver         = {
 270                 .name   = "pmagbafb",
 271                 .bus    = &tc_bus_type,
 272                 .probe  = pmagbafb_probe,
 273                 .remove = pmagbafb_remove,
 274         },
 275 };
 276
 277 static int __init pmagbafb_init(void)
 278 {
 279 #ifndef MODULE
 280         if (fb_get_options("pmagbafb", NULL))
 281                 return -ENXIO;
 282 #endif
 283         return tc_register_driver(&pmagbafb_driver);
 284 }
 285
 286 static void __exit pmagbafb_exit(void)
 287 {
 288         tc_unregister_driver(&pmagbafb_driver);
 289 }
 290
 291
 292 module_init(pmagbafb_init);
 293 module_exit(pmagbafb_exit);
 294
 295 MODULE_LICENSE("GPL");