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