drivers/char/drm/ffb_drv.c

   1 /* $Id: ffb_drv.c,v 1.16 2001/10/18 16:00:24 davem Exp $
   2  * ffb_drv.c: Creator/Creator3D direct rendering driver.
   3  *
   4  * Copyright (C) 2000 David S. Miller (davem@redhat.com)
   5  */
   6
   7 #include <linux/config.h>
   8 #include "ffb.h"
   9 #include "drmP.h"
  10
  11 #include "ffb_drv.h"
  12
  13 #include <linux/sched.h>
  14 #include <linux/smp_lock.h>
  15 #include <asm/shmparam.h>
  16 #include <asm/oplib.h>
  17 #include <asm/upa.h>
  18
  19 #define DRIVER_AUTHOR           "David S. Miller"
  20
  21 #define DRIVER_NAME             "ffb"
  22 #define DRIVER_DESC             "Creator/Creator3D"
  23 #define DRIVER_DATE             "20000517"
  24
  25 #define DRIVER_MAJOR            0
  26 #define DRIVER_MINOR            0
  27 #define DRIVER_PATCHLEVEL       1
  28
  29 typedef struct _ffb_position_t {
  30         int node;
  31         int root;
  32 } ffb_position_t;
  33
  34 static ffb_position_t *ffb_position;
  35
  36 static void get_ffb_type(ffb_dev_priv_t * ffb_priv, int instance)
  37 {
  38         volatile unsigned char *strap_bits;
  39         unsigned char val;
  40
  41         strap_bits = (volatile unsigned char *)
  42             (ffb_priv->card_phys_base + 0x00200000UL);
  43
  44         /* Don't ask, you have to read the value twice for whatever
  45          * reason to get correct contents.
  46          */
  47         val = upa_readb(strap_bits);
  48         val = upa_readb(strap_bits);
  49         switch (val & 0x78) {
  50         case (0x0 << 5) | (0x0 << 3):
  51                 ffb_priv->ffb_type = ffb1_prototype;
  52                 printk("ffb%d: Detected FFB1 pre-FCS prototype\n", instance);
  53                 break;
  54         case (0x0 << 5) | (0x1 << 3):
  55                 ffb_priv->ffb_type = ffb1_standard;
  56                 printk("ffb%d: Detected FFB1\n", instance);
  57                 break;
  58         case (0x0 << 5) | (0x3 << 3):
  59                 ffb_priv->ffb_type = ffb1_speedsort;
  60                 printk("ffb%d: Detected FFB1-SpeedSort\n", instance);
  61                 break;
  62         case (0x1 << 5) | (0x0 << 3):
  63                 ffb_priv->ffb_type = ffb2_prototype;
  64                 printk("ffb%d: Detected FFB2/vertical pre-FCS prototype\n",
  65                        instance);
  66                 break;
  67         case (0x1 << 5) | (0x1 << 3):
  68                 ffb_priv->ffb_type = ffb2_vertical;
  69                 printk("ffb%d: Detected FFB2/vertical\n", instance);
  70                 break;
  71         case (0x1 << 5) | (0x2 << 3):
  72                 ffb_priv->ffb_type = ffb2_vertical_plus;
  73                 printk("ffb%d: Detected FFB2+/vertical\n", instance);
  74                 break;
  75         case (0x2 << 5) | (0x0 << 3):
  76                 ffb_priv->ffb_type = ffb2_horizontal;
  77                 printk("ffb%d: Detected FFB2/horizontal\n", instance);
  78                 break;
  79         case (0x2 << 5) | (0x2 << 3):
  80                 ffb_priv->ffb_type = ffb2_horizontal;
  81                 printk("ffb%d: Detected FFB2+/horizontal\n", instance);
  82                 break;
  83         default:
  84                 ffb_priv->ffb_type = ffb2_vertical;
  85                 printk("ffb%d: Unknown boardID[%08x], assuming FFB2\n",
  86                        instance, val);
  87                 break;
  88         };
  89 }
  90
  91 static void ffb_apply_upa_parent_ranges(int parent,
  92                                         struct linux_prom64_registers *regs)
  93 {
  94         struct linux_prom64_ranges ranges[PROMREG_MAX];
  95         char name[128];
  96         int len, i;
  97
  98         prom_getproperty(parent, "name", name, sizeof(name));
  99         if (strcmp(name, "upa") != 0)
 100                 return;
 101
 102         len =
 103             prom_getproperty(parent, "ranges", (void *)ranges, sizeof(ranges));
 104         if (len <= 0)
 105                 return;
 106
 107         len /= sizeof(struct linux_prom64_ranges);
 108         for (i = 0; i < len; i++) {
 109                 struct linux_prom64_ranges *rng = &ranges[i];
 110                 u64 phys_addr = regs->phys_addr;
 111
 112                 if (phys_addr >= rng->ot_child_base &&
 113                     phys_addr < (rng->ot_child_base + rng->or_size)) {
 114                         regs->phys_addr -= rng->ot_child_base;
 115                         regs->phys_addr += rng->ot_parent_base;
 116                         return;
 117                 }
 118         }
 119
 120         return;
 121 }
 122
 123 static int ffb_init_one(drm_device_t * dev, int prom_node, int parent_node,
 124                         int instance)
 125 {
 126         struct linux_prom64_registers regs[2 * PROMREG_MAX];
 127         ffb_dev_priv_t *ffb_priv = (ffb_dev_priv_t *) dev->dev_private;
 128         int i;
 129
 130         ffb_priv->prom_node = prom_node;
 131         if (prom_getproperty(ffb_priv->prom_node, "reg",
 132                              (void *)regs, sizeof(regs)) <= 0) {
 133                 return -EINVAL;
 134         }
 135         ffb_apply_upa_parent_ranges(parent_node, &regs[0]);
 136         ffb_priv->card_phys_base = regs[0].phys_addr;
 137         ffb_priv->regs = (ffb_fbcPtr)
 138             (regs[0].phys_addr + 0x00600000UL);
 139         get_ffb_type(ffb_priv, instance);
 140         for (i = 0; i < FFB_MAX_CTXS; i++)
 141                 ffb_priv->hw_state[i] = NULL;
 142
 143         return 0;
 144 }
 145
 146 static drm_map_t *ffb_find_map(struct file *filp, unsigned long off)
 147 {
 148         drm_file_t *priv = filp->private_data;
 149         drm_device_t *dev;
 150         drm_map_list_t *r_list;
 151         struct list_head *list;
 152         drm_map_t *map;
 153
 154         if (!priv || (dev = priv->dev) == NULL)
 155                 return NULL;
 156
 157         list_for_each(list, &dev->maplist->head) {
 158                 r_list = (drm_map_list_t *) list;
 159                 map = r_list->map;
 160                 if (!map)
 161                         continue;
 162                 if (r_list->user_token == off)
 163                         return map;
 164         }
 165
 166         return NULL;
 167 }
 168
 169 unsigned long ffb_get_unmapped_area(struct file *filp,
 170                                     unsigned long hint,
 171                                     unsigned long len,
 172                                     unsigned long pgoff, unsigned long flags)
 173 {
 174         drm_map_t *map = ffb_find_map(filp, pgoff << PAGE_SHIFT);
 175         unsigned long addr = -ENOMEM;
 176
 177         if (!map)
 178                 return get_unmapped_area(NULL, hint, len, pgoff, flags);
 179
 180         if (map->type == _DRM_FRAME_BUFFER || map->type == _DRM_REGISTERS) {
 181 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA
 182                 addr = get_fb_unmapped_area(filp, hint, len, pgoff, flags);
 183 #else
 184                 addr = get_unmapped_area(NULL, hint, len, pgoff, flags);
 185 #endif
 186         } else if (map->type == _DRM_SHM && SHMLBA > PAGE_SIZE) {
 187                 unsigned long slack = SHMLBA - PAGE_SIZE;
 188
 189                 addr = get_unmapped_area(NULL, hint, len + slack, pgoff, flags);
 190                 if (!(addr & ~PAGE_MASK)) {
 191                         unsigned long kvirt = (unsigned long)map->handle;
 192
 193                         if ((kvirt & (SHMLBA - 1)) != (addr & (SHMLBA - 1))) {
 194                                 unsigned long koff, aoff;
 195
 196                                 koff = kvirt & (SHMLBA - 1);
 197                                 aoff = addr & (SHMLBA - 1);
 198                                 if (koff < aoff)
 199                                         koff += SHMLBA;
 200
 201                                 addr += (koff - aoff);
 202                         }
 203                 }
 204         } else {
 205                 addr = get_unmapped_area(NULL, hint, len, pgoff, flags);
 206         }
 207
 208         return addr;
 209 }
 210
 211 static int ffb_presetup(drm_device_t * dev)
 212 {
 213         ffb_dev_priv_t *ffb_priv;
 214         int ret = 0;
 215         int i = 0;
 216
 217         /* Check for the case where no device was found. */
 218         if (ffb_position == NULL)
 219                 return -ENODEV;
 220
 221         /* code used to use numdevs no numdevs anymore */
 222         ffb_priv = kmalloc(sizeof(ffb_dev_priv_t), GFP_KERNEL);
 223         if (!ffb_priv)
 224                 return -ENOMEM;
 225         memset(ffb_priv, 0, sizeof(*ffb_priv));
 226         dev->dev_private = ffb_priv;
 227
 228         ret = ffb_init_one(dev, ffb_position[i].node, ffb_position[i].root, i);
 229         return ret;
 230 }
 231
 232 static void ffb_driver_release(drm_device_t * dev, struct file *filp)
 233 {
 234         ffb_dev_priv_t *fpriv = (ffb_dev_priv_t *) dev->dev_private;
 235         int context = _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock);
 236         int idx;
 237
 238         idx = context - 1;
 239         if (fpriv &&
 240             context != DRM_KERNEL_CONTEXT && fpriv->hw_state[idx] != NULL) {
 241                 kfree(fpriv->hw_state[idx]);
 242                 fpriv->hw_state[idx] = NULL;
 243         }
 244 }
 245
 246 static void ffb_driver_pretakedown(drm_device_t * dev)
 247 {
 248         if (dev->dev_private)
 249                 kfree(dev->dev_private);
 250 }
 251
 252 static int ffb_driver_postcleanup(drm_device_t * dev)
 253 {
 254         if (ffb_position != NULL)
 255                 kfree(ffb_position);
 256         return 0;
 257 }
 258
 259 static void ffb_driver_kernel_context_switch_unlock(struct drm_device *dev,
 260                                                     drm_lock_t * lock)
 261 {
 262         dev->lock.filp = 0;
 263         {
 264                 __volatile__ unsigned int *plock = &dev->lock.hw_lock->lock;
 265                 unsigned int old, new, prev, ctx;
 266
 267                 ctx = lock->context;
 268                 do {
 269                         old = *plock;
 270                         new = ctx;
 271                         prev = cmpxchg(plock, old, new);
 272                 } while (prev != old);
 273         }
 274         wake_up_interruptible(&dev->lock.lock_queue);
 275 }
 276
 277 static unsigned long ffb_driver_get_map_ofs(drm_map_t * map)
 278 {
 279         return (map->offset & 0xffffffff);
 280 }
 281
 282 static unsigned long ffb_driver_get_reg_ofs(drm_device_t * dev)
 283 {
 284         ffb_dev_priv_t *ffb_priv = (ffb_dev_priv_t *) dev->dev_private;
 285
 286         if (ffb_priv)
 287                 return ffb_priv->card_phys_base;
 288
 289         return 0;
 290 }
 291
 292 static int postinit(struct drm_device *dev, unsigned long flags)
 293 {
 294         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
 295                  DRIVER_NAME,
 296                  DRIVER_MAJOR,
 297                  DRIVER_MINOR, DRIVER_PATCHLEVEL, DRIVER_DATE, dev->minor);
 298         return 0;
 299 }
 300
 301 static int version(drm_version_t * version)
 302 {
 303         int len;
 304
 305         version->version_major = DRIVER_MAJOR;
 306         version->version_minor = DRIVER_MINOR;
 307         version->version_patchlevel = DRIVER_PATCHLEVEL;
 308         DRM_COPY(version->name, DRIVER_NAME);
 309         DRM_COPY(version->date, DRIVER_DATE);
 310         DRM_COPY(version->desc, DRIVER_DESC);
 311         return 0;
 312 }
 313
 314 static drm_ioctl_desc_t ioctls[] = {
 315
 316 };
 317
 318 static struct drm_driver driver = {
 319         .driver_features = 0,
 320         .dev_priv_size = sizeof(u32),
 321         .release = ffb_driver_release,
 322         .presetup = ffb_presetup,
 323         .pretakedown = ffb_driver_pretakedown,
 324         .postcleanup = ffb_driver_postcleanup,
 325         .kernel_context_switch = ffb_driver_context_switch,
 326         .kernel_context_switch_unlock = ffb_driver_kernel_context_switch_unlock,
 327         .get_map_ofs = ffb_driver_get_map_ofs,
 328         .get_reg_ofs = ffb_driver_get_reg_ofs,
 329         .postinit = postinit,
 330         .version = version,
 331         .ioctls = ioctls,
 332         .num_ioctls = DRM_ARRAY_SIZE(ioctls),
 333         .fops = {
 334                  .owner = THIS_MODULE,
 335                  .open = drm_open,
 336                  .release = drm_release,
 337                  .ioctl = drm_ioctl,
 338                  .mmap = drm_mmap,
 339                  .poll = drm_poll,
 340                  .fasync = drm_fasync,
 341                  }
 342         ,
 343 };
 344
 345 static int __init ffb_init(void)
 346 {
 347         return -ENODEV;
 348 }
 349
 350 static void __exit ffb_exit(void)
 351 {
 352 }
 353
 354 module_init(ffb_init);
 355 module_exit(ffb_exit);
 356
 357 MODULE_AUTHOR(DRIVER_AUTHOR);
 358 MODULE_DESCRIPTION(DRIVER_DESC);
 359 MODULE_LICENSE("GPL and additional rights");