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