drivers/video/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 #include <asm/system.h>
  37
  38 #include <video/pmag-ba-fb.h>
  39
  40
  41 struct pmagbafb_par {
  42         volatile void __iomem *mmio;
  43         volatile u32 __iomem *dac;
  44 };
  45
  46
  47 static struct fb_var_screeninfo pmagbafb_defined __initdata = {
  48         .xres           = 1024,
  49         .yres           = 864,
  50         .xres_virtual   = 1024,
  51         .yres_virtual   = 864,
  52         .bits_per_pixel = 8,
  53         .red.length     = 8,
  54         .green.length   = 8,
  55         .blue.length    = 8,
  56         .activate       = FB_ACTIVATE_NOW,
  57         .height         = -1,
  58         .width          = -1,
  59         .accel_flags    = FB_ACCEL_NONE,
  60         .pixclock       = 14452,
  61         .left_margin    = 116,
  62         .right_margin   = 12,
  63         .upper_margin   = 34,
  64         .lower_margin   = 12,
  65         .hsync_len      = 128,
  66         .vsync_len      = 3,
  67         .sync           = FB_SYNC_ON_GREEN,
  68         .vmode          = FB_VMODE_NONINTERLACED,
  69 };
  70
  71 static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
  72         .id             = "PMAG-BA",
  73         .smem_len       = (1024 * 1024),
  74         .type           = FB_TYPE_PACKED_PIXELS,
  75         .visual         = FB_VISUAL_PSEUDOCOLOR,
  76         .line_length    = 1024,
  77         .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,
  78 };
  79
  80
  81 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
  82 {
  83         writeb(v, par->dac + reg / 4);
  84 }
  85
  86 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
  87 {
  88         return readb(par->dac + reg / 4);
  89 }
  90
  91
  92 /*
  93  * Set the palette.
  94  */
  95 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
  96                               unsigned int green, unsigned int blue,
  97                               unsigned int transp, struct fb_info *info)
  98 {
  99         struct pmagbafb_par *par = info->par;
 100
 101         if (regno >= info->cmap.len)
 102                 return 1;
 103
 104         red   >>= 8;    /* The cmap fields are 16 bits    */
 105         green >>= 8;    /* wide, but the hardware colormap */
 106         blue  >>= 8;    /* registers are only 8 bits wide */
 107
 108         mb();
 109         dac_write(par, BT459_ADDR_LO, regno);
 110         dac_write(par, BT459_ADDR_HI, 0x00);
 111         wmb();
 112         dac_write(par, BT459_CMAP, red);
 113         wmb();
 114         dac_write(par, BT459_CMAP, green);
 115         wmb();
 116         dac_write(par, BT459_CMAP, blue);
 117
 118         return 0;
 119 }
 120
 121 static struct fb_ops pmagbafb_ops = {
 122         .owner          = THIS_MODULE,
 123         .fb_setcolreg   = pmagbafb_setcolreg,
 124         .fb_fillrect    = cfb_fillrect,
 125         .fb_copyarea    = cfb_copyarea,
 126         .fb_imageblit   = cfb_imageblit,
 127 };
 128
 129
 130 /*
 131  * Turn the hardware cursor off.
 132  */
 133 static void __init pmagbafb_erase_cursor(struct fb_info *info)
 134 {
 135         struct pmagbafb_par *par = info->par;
 136
 137         mb();
 138         dac_write(par, BT459_ADDR_LO, 0x00);
 139         dac_write(par, BT459_ADDR_HI, 0x03);
 140         wmb();
 141         dac_write(par, BT459_DATA, 0x00);
 142 }
 143
 144
 145 static int __init pmagbafb_probe(struct device *dev)
 146 {
 147         struct tc_dev *tdev = to_tc_dev(dev);
 148         resource_size_t start, len;
 149         struct fb_info *info;
 150         struct pmagbafb_par *par;
 151         int err;
 152
 153         info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
 154         if (!info) {
 155                 printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
 156                 return -ENOMEM;
 157         }
 158
 159         par = info->par;
 160         dev_set_drvdata(dev, info);
 161
 162         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 163                 printk(KERN_ERR "%s: Cannot allocate color map\n",
 164                        dev_name(dev));
 165                 err = -ENOMEM;
 166                 goto err_alloc;
 167         }
 168
 169         info->fbops = &pmagbafb_ops;
 170         info->fix = pmagbafb_fix;
 171         info->var = pmagbafb_defined;
 172         info->flags = FBINFO_DEFAULT;
 173
 174         /* Request the I/O MEM resource.  */
 175         start = tdev->resource.start;
 176         len = tdev->resource.end - start + 1;
 177         if (!request_mem_region(start, len, dev_name(dev))) {
 178                 printk(KERN_ERR "%s: Cannot reserve FB region\n",
 179                        dev_name(dev));
 180                 err = -EBUSY;
 181                 goto err_cmap;
 182         }
 183
 184         /* MMIO mapping setup.  */
 185         info->fix.mmio_start = start;
 186         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
 187         if (!par->mmio) {
 188                 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
 189                 err = -ENOMEM;
 190                 goto err_resource;
 191         }
 192         par->dac = par->mmio + PMAG_BA_BT459;
 193
 194         /* Frame buffer mapping setup.  */
 195         info->fix.smem_start = start + PMAG_BA_FBMEM;
 196         info->screen_base = ioremap_nocache(info->fix.smem_start,
 197                                             info->fix.smem_len);
 198         if (!info->screen_base) {
 199                 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
 200                 err = -ENOMEM;
 201                 goto err_mmio_map;
 202         }
 203         info->screen_size = info->fix.smem_len;
 204
 205         pmagbafb_erase_cursor(info);
 206
 207         err = register_framebuffer(info);
 208         if (err < 0) {
 209                 printk(KERN_ERR "%s: Cannot register framebuffer\n",
 210                        dev_name(dev));
 211                 goto err_smem_map;
 212         }
 213
 214         get_device(dev);
 215
 216         pr_info("fb%d: %s frame buffer device at %s\n",
 217                 info->node, info->fix.id, dev_name(dev));
 218
 219         return 0;
 220
 221
 222 err_smem_map:
 223         iounmap(info->screen_base);
 224
 225 err_mmio_map:
 226         iounmap(par->mmio);
 227
 228 err_resource:
 229         release_mem_region(start, len);
 230
 231 err_cmap:
 232         fb_dealloc_cmap(&info->cmap);
 233
 234 err_alloc:
 235         framebuffer_release(info);
 236         return err;
 237 }
 238
 239 static int __exit pmagbafb_remove(struct device *dev)
 240 {
 241         struct tc_dev *tdev = to_tc_dev(dev);
 242         struct fb_info *info = dev_get_drvdata(dev);
 243         struct pmagbafb_par *par = info->par;
 244         resource_size_t start, len;
 245
 246         put_device(dev);
 247         unregister_framebuffer(info);
 248         iounmap(info->screen_base);
 249         iounmap(par->mmio);
 250         start = tdev->resource.start;
 251         len = tdev->resource.end - start + 1;
 252         release_mem_region(start, len);
 253         fb_dealloc_cmap(&info->cmap);
 254         framebuffer_release(info);
 255         return 0;
 256 }
 257
 258
 259 /*
 260  * Initialize the framebuffer.
 261  */
 262 static const struct tc_device_id pmagbafb_tc_table[] = {
 263         { "DEC     ", "PMAG-BA " },
 264         { }
 265 };
 266 MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
 267
 268 static struct tc_driver pmagbafb_driver = {
 269         .id_table       = pmagbafb_tc_table,
 270         .driver         = {
 271                 .name   = "pmagbafb",
 272                 .bus    = &tc_bus_type,
 273                 .probe  = pmagbafb_probe,
 274                 .remove = __exit_p(pmagbafb_remove),
 275         },
 276 };
 277
 278 static int __init pmagbafb_init(void)
 279 {
 280 #ifndef MODULE
 281         if (fb_get_options("pmagbafb", NULL))
 282                 return -ENXIO;
 283 #endif
 284         return tc_register_driver(&pmagbafb_driver);
 285 }
 286
 287 static void __exit pmagbafb_exit(void)
 288 {
 289         tc_unregister_driver(&pmagbafb_driver);
 290 }
 291
 292
 293 module_init(pmagbafb_init);
 294 module_exit(pmagbafb_exit);
 295
 296 MODULE_LICENSE("GPL");