linux/drivers/video/pmag-ba-fb.c
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   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
  40struct pmagbafb_par {
  41        volatile void __iomem *mmio;
  42        volatile u32 __iomem *dac;
  43};
  44
  45
  46static struct fb_var_screeninfo pmagbafb_defined __devinitdata = {
  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   = 12,
  64        .hsync_len      = 128,
  65        .vsync_len      = 3,
  66        .sync           = FB_SYNC_ON_GREEN,
  67        .vmode          = FB_VMODE_NONINTERLACED,
  68};
  69
  70static struct fb_fix_screeninfo pmagbafb_fix __devinitdata = {
  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
  80static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
  81{
  82        writeb(v, par->dac + reg / 4);
  83}
  84
  85static 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 */
  94static 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
 120static 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 */
 132static void __init 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
 144static int __devinit 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        pr_info("fb%d: %s frame buffer device at %s\n",
 216                info->node, info->fix.id, dev_name(dev));
 217
 218        return 0;
 219
 220
 221err_smem_map:
 222        iounmap(info->screen_base);
 223
 224err_mmio_map:
 225        iounmap(par->mmio);
 226
 227err_resource:
 228        release_mem_region(start, len);
 229
 230err_cmap:
 231        fb_dealloc_cmap(&info->cmap);
 232
 233err_alloc:
 234        framebuffer_release(info);
 235        return err;
 236}
 237
 238static int __exit 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 */
 261static const struct tc_device_id pmagbafb_tc_table[] = {
 262        { "DEC     ", "PMAG-BA " },
 263        { }
 264};
 265MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
 266
 267static 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 = __exit_p(pmagbafb_remove),
 274        },
 275};
 276
 277static 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
 286static void __exit pmagbafb_exit(void)
 287{
 288        tc_unregister_driver(&pmagbafb_driver);
 289}
 290
 291
 292module_init(pmagbafb_init);
 293module_exit(pmagbafb_exit);
 294
 295MODULE_LICENSE("GPL");
 296
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