drivers/char/vino.c

   1 /* $Id: vino.c,v 1.4 1999/02/09 23:59:36 ulfc Exp $
   2  * drivers/char/vino.c
   3  *
   4  * (incomplete) Driver for the Vino Video input system found in SGI Indys.
   5  *
   6  * Copyright (C) 1999 Ulf Carlsson (ulfc@bun.falkenberg.se)
   7  *
   8  * This isn't complete yet, please don't expect any video until I've written
   9  * some more code.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/videodev.h>
  18
  19 #include <asm/addrspace.h>
  20 #include <asm/system.h>
  21
  22 #include "vino.h"
  23
  24 struct vino_device {
  25         struct video_device vdev;
  26
  27         unsigned long chan;
  28 #define VINO_CHAN_A             0
  29 #define VINO_CHAN_B             1
  30
  31         unsigned long flags;
  32 #define VINO_DMA_ACTIVE         (1<<0)
  33 };
  34
  35 /* We can actually receive TV and IndyCam input at the same time. Believe it or
  36  * not..
  37  */
  38 static struct vino_device vino[2];
  39
  40 /* Those registers have to be accessed by either *one* 64 bit write or *one* 64
  41  * bit read. We need some asm to fix this. We can't use mips3 as standard
  42  * because we just save 32 bits at context switch.
  43  */
  44
  45 static __inline__ unsigned long long vino_reg_read(unsigned long addr)
  46 {
  47         unsigned long long ret __attribute__ ((aligned (64)));
  48         unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
  49         unsigned long flags;
  50
  51         save_and_cli(flags);
  52         __asm__ __volatile__(
  53                 ".set\tmips3\n\t"
  54                 ".set\tnoat\n\t"
  55                 "ld\t$1,(%0)\n\t"
  56                 "sd\t$1,(%1)\n\t"
  57                 ".set\tat\n\t"
  58                 ".set\tmips0"
  59                 :
  60                 :"r" (virt_addr),
  61                  "r" (&ret)
  62                 :"$1");
  63         restore_flags(flags);
  64
  65         return ret;
  66 }
  67
  68 static __inline__ void vino_reg_write(unsigned long long value,
  69                                       unsigned long addr)
  70 {
  71         unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
  72         unsigned long flags;
  73
  74         /* we might lose the upper parts of the registers which are not saved
  75          * if there comes an interrupt in our way, play safe */
  76
  77         save_and_cli(flags);
  78         __asm__ __volatile__(
  79                 ".set\tmips3\n\t"
  80                 ".set\tnoat\n\t"
  81                 "ld\t$1,(%0)\n\t"
  82                 "sd\t$1,(%1)\n\t"
  83                 ".set\tat\n\t"
  84                 ".set\tmips0"
  85                 :
  86                 :"r" (&value),
  87                  "r" (virt_addr)
  88                 :"$1");
  89         restore_flags(flags);
  90 }
  91
  92 static __inline__ void vino_reg_and(unsigned long long value,
  93                                     unsigned long addr)
  94 {
  95         unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
  96         unsigned long flags;
  97
  98         save_and_cli(flags);
  99         __asm__ __volatile__(
 100                 ".set\tmips3\n\t"
 101                 ".set\tnoat\n\t"
 102                 "ld\t$1,(%0)\n\t"
 103                 "ld\t$2,(%1)\n\t"
 104                 "and\t$1,$1,$2\n\t"
 105                 "sd\t$1,(%0)\n\t"
 106                 ".set\tat\n\t"
 107                 ".set\tmips0"
 108                 :
 109                 :"r" (virt_addr),
 110                  "r" (&value)
 111                 :"$1","$2");
 112         restore_flags(flags);
 113 }
 114
 115 static __inline__ void vino_reg_or(unsigned long long value,
 116                                    unsigned long addr)
 117 {
 118         unsigned long virt_addr = KSEG1ADDR(addr + VINO_BASE);
 119         unsigned long flags;
 120
 121         save_and_cli(flags);
 122         __asm__ __volatile__(
 123                 ".set\tmips3\n\t"
 124                 ".set\tnoat\n\t"
 125                 "ld\t$1,(%0)\n\t"
 126                 "ld\t$2,(%1)\n\t"
 127                 "or\t$1,$1,$2\n\t"
 128                 "sd\t$1,(%0)\n\t"
 129                 ".set\tat\n\t"
 130                 ".set\tmips0"
 131                 :
 132                 :"r" (virt_addr),
 133                  "r" (&value)
 134                 :"$1","$2");
 135         restore_flags(flags);
 136 }
 137
 138 static int vino_dma_setup(void)
 139 {
 140         return 0;
 141 }
 142
 143 static void vino_dma_stop(void)
 144 {
 145
 146 }
 147
 148 static int vino_init(void)
 149 {
 150         unsigned long ret;
 151         unsigned short rev, id;
 152         unsigned long long foo;
 153         unsigned long *bar;
 154
 155         bar = (unsigned long *) &foo;
 156
 157         ret = vino_reg_read(VINO_REVID);
 158
 159         rev = (ret & VINO_REVID_REV_MASK);
 160         id = (ret & VINO_REVID_ID_MASK) >> 4;
 161
 162         printk("Vino: ID:%02hx Rev:%02hx\n", id, rev);
 163
 164         foo = vino_reg_read(VINO_A_DESC_DATA0);
 165         printk("0x%lx", bar[0]);
 166         printk("%lx ", bar[1]);
 167         foo = vino_reg_read(VINO_A_DESC_DATA1);
 168         printk("0x%lx", bar[0]);
 169         printk("%lx ", bar[1]);
 170         foo = vino_reg_read(VINO_A_DESC_DATA2);
 171         printk("0x%lx", bar[0]);
 172         printk("%lx ", bar[1]);
 173         foo = vino_reg_read(VINO_A_DESC_DATA3);
 174         printk("0x%lx", bar[0]);
 175         printk("%lx\n", bar[1]);
 176         foo = vino_reg_read(VINO_B_DESC_DATA0);
 177         printk("0x%lx", bar[0]);
 178         printk("%lx ", bar[1]);
 179         foo = vino_reg_read(VINO_B_DESC_DATA1);
 180         printk("0x%lx", bar[0]);
 181         printk("%lx ", bar[1]);
 182         foo = vino_reg_read(VINO_B_DESC_DATA2);
 183         printk("0x%lx", bar[0]);
 184         printk("%lx ", bar[1]);
 185         foo = vino_reg_read(VINO_B_DESC_DATA3);
 186         printk("0x%lx", bar[0]);
 187         printk("%lx\n", bar[1]);
 188
 189         return 0;
 190 }
 191
 192 static void vino_dma_go(struct vino_device *v)
 193 {
 194
 195 }
 196
 197 /* Reset the vino back to default state */
 198
 199 static void vino_setup(struct vino_device *v)
 200 {
 201
 202 }
 203
 204 static int vino_open(struct video_device *dev, int flags)
 205 {
 206         MOD_INC_USE_COUNT;
 207         return 0;
 208 }
 209
 210 static void vino_close(struct video_device *dev)
 211 {
 212         MOD_DEC_USE_COUNT;
 213 }
 214
 215 static int vino_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
 216 {
 217         return 0;
 218 }
 219
 220 static int vino_mmap(struct video_device *dev, const char *adr,
 221                      unsigned long size)
 222 {
 223         return 0;
 224 }
 225
 226 static struct video_device vino_dev = {
 227         "Vino IndyCam/TV",
 228         VID_TYPE_CAPTURE,
 229         VID_HARDWARE_VINO,
 230         vino_open,
 231         vino_close,
 232         NULL,           /* vino_read */
 233         NULL,           /* vino_write */
 234         NULL,           /* vino_poll */
 235         vino_ioctl,
 236         vino_mmap,
 237         NULL,           /* vino_init */
 238         NULL,
 239         0,
 240         0
 241 };
 242
 243 __initfunc(int init_vino(struct video_device *dev))
 244 {
 245         int err;
 246
 247         err = vino_init();
 248         if (err)
 249                 return err;
 250
 251 #if 0
 252         if (video_register_device(&vinodev, VFL_TYPE_GRABBER) == -1) {
 253                 return -ENODEV;
 254         }
 255 #endif
 256
 257         return 0;
 258 }
 259
 260 #ifdef MODULE
 261 int init_module(void)
 262 {
 263         int err;
 264
 265         err = vino_init();
 266         if (err)
 267                 return err;
 268
 269         return 0;
 270 }
 271
 272 void cleanup_module(void)
 273 {
 274 }
 275 #endif