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  Maciej W. Rozycki
  19  *
  20  *      This file is subject to the terms and conditions of the GNU General
  21  *      Public License.  See the file COPYING in the main directory of this
  22  *      archive for more details.
  23  */
  24
  25 #include <linux/compiler.h>
  26 #include <linux/errno.h>
  27 #include <linux/fb.h>
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/types.h>
  32
  33 #include <asm/bug.h>
  34 #include <asm/io.h>
  35 #include <asm/system.h>
  36
  37 #include <asm/dec/tc.h>
  38
  39 #include <video/pmag-ba-fb.h>
  40
  41
  42 struct pmagbafb_par {
  43         struct fb_info *next;
  44         volatile void __iomem *mmio;
  45         volatile u32 __iomem *dac;
  46         int slot;
  47 };
  48
  49
  50 static struct fb_info *root_pmagbafb_dev;
  51
  52 static struct fb_var_screeninfo pmagbafb_defined __initdata = {
  53         .xres           = 1024,
  54         .yres           = 864,
  55         .xres_virtual   = 1024,
  56         .yres_virtual   = 864,
  57         .bits_per_pixel = 8,
  58         .red.length     = 8,
  59         .green.length   = 8,
  60         .blue.length    = 8,
  61         .activate       = FB_ACTIVATE_NOW,
  62         .height         = -1,
  63         .width          = -1,
  64         .accel_flags    = FB_ACCEL_NONE,
  65         .pixclock       = 14452,
  66         .left_margin    = 116,
  67         .right_margin   = 12,
  68         .upper_margin   = 34,
  69         .lower_margin   = 12,
  70         .hsync_len      = 128,
  71         .vsync_len      = 3,
  72         .sync           = FB_SYNC_ON_GREEN,
  73         .vmode          = FB_VMODE_NONINTERLACED,
  74 };
  75
  76 static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
  77         .id             = "PMAG-BA",
  78         .smem_len       = (1024 * 1024),
  79         .type           = FB_TYPE_PACKED_PIXELS,
  80         .visual         = FB_VISUAL_PSEUDOCOLOR,
  81         .line_length    = 1024,
  82         .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,
  83 };
  84
  85
  86 static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
  87 {
  88         writeb(v, par->dac + reg / 4);
  89 }
  90
  91 static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
  92 {
  93         return readb(par->dac + reg / 4);
  94 }
  95
  96
  97 /*
  98  * Set the palette.
  99  */
 100 static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
 101                               unsigned int green, unsigned int blue,
 102                               unsigned int transp, struct fb_info *info)
 103 {
 104         struct pmagbafb_par *par = info->par;
 105
 106         BUG_ON(regno >= info->cmap.len);
 107
 108         red   >>= 8;    /* The cmap fields are 16 bits    */
 109         green >>= 8;    /* wide, but the hardware colormap */
 110         blue  >>= 8;    /* registers are only 8 bits wide */
 111
 112         mb();
 113         dac_write(par, BT459_ADDR_LO, regno);
 114         dac_write(par, BT459_ADDR_HI, 0x00);
 115         wmb();
 116         dac_write(par, BT459_CMAP, red);
 117         wmb();
 118         dac_write(par, BT459_CMAP, green);
 119         wmb();
 120         dac_write(par, BT459_CMAP, blue);
 121
 122         return 0;
 123 }
 124
 125 static struct fb_ops pmagbafb_ops = {
 126         .owner          = THIS_MODULE,
 127         .fb_setcolreg   = pmagbafb_setcolreg,
 128         .fb_fillrect    = cfb_fillrect,
 129         .fb_copyarea    = cfb_copyarea,
 130         .fb_imageblit   = cfb_imageblit,
 131 };
 132
 133
 134 /*
 135  * Turn the hardware cursor off.
 136  */
 137 static void __init pmagbafb_erase_cursor(struct fb_info *info)
 138 {
 139         struct pmagbafb_par *par = info->par;
 140
 141         mb();
 142         dac_write(par, BT459_ADDR_LO, 0x00);
 143         dac_write(par, BT459_ADDR_HI, 0x03);
 144         wmb();
 145         dac_write(par, BT459_DATA, 0x00);
 146 }
 147
 148
 149 static int __init pmagbafb_init_one(int slot)
 150 {
 151         struct fb_info *info;
 152         struct pmagbafb_par *par;
 153         unsigned long base_addr;
 154
 155         info = framebuffer_alloc(sizeof(struct pmagbafb_par), NULL);
 156         if (!info)
 157                 return -ENOMEM;
 158
 159         par = info->par;
 160         par->slot = slot;
 161         claim_tc_card(par->slot);
 162
 163         base_addr = get_tc_base_addr(par->slot);
 164
 165         par->next = root_pmagbafb_dev;
 166         root_pmagbafb_dev = info;
 167
 168         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
 169                 goto err_alloc;
 170
 171         info->fbops = &pmagbafb_ops;
 172         info->fix = pmagbafb_fix;
 173         info->var = pmagbafb_defined;
 174         info->flags = FBINFO_DEFAULT;
 175
 176         /* MMIO mapping setup.  */
 177         info->fix.mmio_start = base_addr;
 178         par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
 179         if (!par->mmio)
 180                 goto err_cmap;
 181         par->dac = par->mmio + PMAG_BA_BT459;
 182
 183         /* Frame buffer mapping setup.  */
 184         info->fix.smem_start = base_addr + PMAG_BA_FBMEM;
 185         info->screen_base = ioremap_nocache(info->fix.smem_start,
 186                                             info->fix.smem_len);
 187         if (!info->screen_base)
 188                 goto err_mmio_map;
 189         info->screen_size = info->fix.smem_len;
 190
 191         pmagbafb_erase_cursor(info);
 192
 193         if (register_framebuffer(info) < 0)
 194                 goto err_smem_map;
 195
 196         pr_info("fb%d: %s frame buffer device in slot %d\n",
 197                 info->node, info->fix.id, par->slot);
 198
 199         return 0;
 200
 201
 202 err_smem_map:
 203         iounmap(info->screen_base);
 204
 205 err_mmio_map:
 206         iounmap(par->mmio);
 207
 208 err_cmap:
 209         fb_dealloc_cmap(&info->cmap);
 210
 211 err_alloc:
 212         root_pmagbafb_dev = par->next;
 213         release_tc_card(par->slot);
 214         framebuffer_release(info);
 215         return -ENXIO;
 216 }
 217
 218 static void __exit pmagbafb_exit_one(void)
 219 {
 220         struct fb_info *info = root_pmagbafb_dev;
 221         struct pmagbafb_par *par = info->par;
 222
 223         unregister_framebuffer(info);
 224         iounmap(info->screen_base);
 225         iounmap(par->mmio);
 226         fb_dealloc_cmap(&info->cmap);
 227         root_pmagbafb_dev = par->next;
 228         release_tc_card(par->slot);
 229         framebuffer_release(info);
 230 }
 231
 232
 233 /*
 234  * Initialise the framebuffer.
 235  */
 236 static int __init pmagbafb_init(void)
 237 {
 238         int count = 0;
 239         int slot;
 240
 241         if (fb_get_options("pmagbafb", NULL))
 242                 return -ENXIO;
 243
 244         while ((slot = search_tc_card("PMAG-BA")) >= 0) {
 245                 if (pmagbafb_init_one(slot) < 0)
 246                         break;
 247                 count++;
 248         }
 249         return (count > 0) ? 0 : -ENXIO;
 250 }
 251
 252 static void __exit pmagbafb_exit(void)
 253 {
 254         while (root_pmagbafb_dev)
 255                 pmagbafb_exit_one();
 256 }
 257
 258
 259 module_init(pmagbafb_init);
 260 module_exit(pmagbafb_exit);
 261
 262 MODULE_LICENSE("GPL");