sa1100_generic.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

  }

  *map=sa1100_pcmcia_socket[sock].io_map[map->map];

  return 0;
}


/* sa1100_pcmcia_set_io_map()
 * ^^^^^^^^^^^^^^^^^^^^^^^^^^
 * Implements the set_io_map() operation for the in-kernel PCMCIA
 * service (formerly SS_SetIOMap in Card Services). We configure
 * the map speed as requested, but override the address ranges
 * supplied by Card Services.
 *
 * Returns: 0 on success, -1 on error
 */
static int sa1100_pcmcia_set_io_map(unsigned int sock,
				    struct pccard_io_map *map){
  unsigned int clock, speed;
  unsigned long mecr, start;

  DEBUG(4, "%s() for sock %u\n", __FUNCTION__, sock);

  DEBUG(4, "\tmap %u  speed %u\n\tstart 0x%08lx  stop 0x%08lx\n"
	"\tflags: %s%s%s%s%s%s%s%s\n",
	map->map, map->speed, map->start, map->stop,
	(map->flags==0)?"<NONE>":"",
	(map->flags&MAP_ACTIVE)?"ACTIVE ":"",
	(map->flags&MAP_16BIT)?"16BIT ":"",
	(map->flags&MAP_AUTOSZ)?"AUTOSZ ":"",
	(map->flags&MAP_0WS)?"0WS ":"",
	(map->flags&MAP_WRPROT)?"WRPROT ":"",
	(map->flags&MAP_USE_WAIT)?"USE_WAIT ":"",
	(map->flags&MAP_PREFETCH)?"PREFETCH ":"");

  if(map->map>=MAX_IO_WIN){
    printk(KERN_ERR "%s(): map (%d) out of range\n", __FUNCTION__,
	   map->map);
    return -1;
  }

  if(map->flags&MAP_ACTIVE){

    speed=(map->speed>0)?map->speed:SA1100_PCMCIA_IO_ACCESS;

    clock = get_cclk_frequency() * 100;

    mecr=MECR;

    MECR_BSIO_SET(mecr, sock, sa1100_pcmcia_mecr_bs(speed, clock));

    sa1100_pcmcia_socket[sock].speed_io=speed;

    DEBUG(4, "%s(): FAST%u %lx  BSM%u %lx  BSA%u %lx  BSIO%u %lx\n",
	  __FUNCTION__, sock, MECR_FAST_GET(mecr, sock), sock,
	  MECR_BSM_GET(mecr, sock), sock, MECR_BSA_GET(mecr, sock), 
	  sock, MECR_BSIO_GET(mecr, sock));

    MECR=mecr;

  }

  start=map->start;

  if(map->stop==1)
    map->stop=PAGE_SIZE-1;

  map->start=sa1100_pcmcia_socket[sock].virt_io;
  map->stop=map->start+(map->stop-start);

  sa1100_pcmcia_socket[sock].io_map[map->map]=*map;

  return 0;

}  /* sa1100_pcmcia_set_io_map() */


/* sa1100_pcmcia_get_mem_map()
 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 * Implements the get_mem_map() operation for the in-kernel PCMCIA
 * service (formerly SS_GetMemMap in Card Services). Just returns a
 *  memory map descriptor which was assigned earlier by a
 *  set_mem_map() request.
 *
 * Returns: 0 on success, -1 if the map index was out of range
 */
static int sa1100_pcmcia_get_mem_map(unsigned int sock,
				     struct pccard_mem_map *map){

  DEBUG(4, "%s() for sock %u\n", __FUNCTION__, sock);

  if(map->map>=MAX_WIN){
    printk(KERN_ERR "%s(): map (%d) out of range\n", __FUNCTION__,
	   map->map);
    return -1;
  }

  *map=sa1100_pcmcia_socket[sock].mem_map[map->map];

  return 0;
}


/* sa1100_pcmcia_set_mem_map()
 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 * Implements the set_mem_map() operation for the in-kernel PCMCIA
 * service (formerly SS_SetMemMap in Card Services). We configure
 * the map speed as requested, but override the address ranges
 * supplied by Card Services.
 *
 * Returns: 0 on success, -1 on error
 */
static int sa1100_pcmcia_set_mem_map(unsigned int sock,
				     struct pccard_mem_map *map){
  unsigned int clock, speed;
  unsigned long mecr, start;

  DEBUG(4, "%s() for sock %u\n", __FUNCTION__, sock);

  DEBUG(4, "\tmap %u  speed %u\n\tsys_start  %#lx\n"
	"\tsys_stop   %#lx\n\tcard_start %#x\n"
	"\tflags: %s%s%s%s%s%s%s%s\n",
	map->map, map->speed, map->sys_start, map->sys_stop,
	map->card_start, (map->flags==0)?"<NONE>":"",
	(map->flags&MAP_ACTIVE)?"ACTIVE ":"",
	(map->flags&MAP_16BIT)?"16BIT ":"",
	(map->flags&MAP_AUTOSZ)?"AUTOSZ ":"",
	(map->flags&MAP_0WS)?"0WS ":"",
	(map->flags&MAP_WRPROT)?"WRPROT ":"",
	(map->flags&MAP_ATTRIB)?"ATTRIB ":"",
	(map->flags&MAP_USE_WAIT)?"USE_WAIT ":"");

  if(map->map>=MAX_WIN){
    printk(KERN_ERR "%s(): map (%d) out of range\n", __FUNCTION__,
	   map->map);
    return -1;
  }

  if(map->flags&MAP_ACTIVE){

    /* When clients issue RequestMap, the access speed is not always
     * properly configured:
     */
    if(map->speed > 0)
      speed = map->speed;
    else
      switch(sa1100_pcmcia_socket[sock].cs_state.Vcc){
      case 33:
	speed = SA1100_PCMCIA_3V_MEM_ACCESS;
	break;
      default:
	speed = SA1100_PCMCIA_5V_MEM_ACCESS;
      }

    clock = get_cclk_frequency() * 100;
    
    mecr=MECR;
    
    if(map->flags&MAP_ATTRIB){

      MECR_BSA_SET(mecr, sock, sa1100_pcmcia_mecr_bs(speed, clock));
      sa1100_pcmcia_socket[sock].speed_attr=speed;

    } else {

      MECR_BSM_SET(mecr, sock, sa1100_pcmcia_mecr_bs(speed, clock));
      sa1100_pcmcia_socket[sock].speed_mem=speed;

    }
    
    DEBUG(4, "%s(): FAST%u %lx  BSM%u %lx  BSA%u %lx  BSIO%u %lx\n",
	  __FUNCTION__, sock, MECR_FAST_GET(mecr, sock), sock,
	  MECR_BSM_GET(mecr, sock), sock, MECR_BSA_GET(mecr, sock), 
	  sock, MECR_BSIO_GET(mecr, sock));
    
    MECR=mecr;

  }

  start=map->sys_start;

  if(map->sys_stop==0)
    map->sys_stop=PAGE_SIZE-1;

  map->sys_start=(map->flags & MAP_ATTRIB)?\
    sa1100_pcmcia_socket[sock].phys_attr:\
    sa1100_pcmcia_socket[sock].phys_mem;

  map->sys_stop=map->sys_start+(map->sys_stop-start);

  sa1100_pcmcia_socket[sock].mem_map[map->map]=*map;

  return 0;

}  /* sa1100_pcmcia_set_mem_map() */


#if defined(CONFIG_PROC_FS)

/* sa1100_pcmcia_proc_setup()
 * ^^^^^^^^^^^^^^^^^^^^^^^^^^
 * Implements the proc_setup() operation for the in-kernel PCMCIA
 * service (formerly SS_ProcSetup in Card Services).
 *
 * Returns: 0 on success, -1 on error
 */
static void sa1100_pcmcia_proc_setup(unsigned int sock,
				     struct proc_dir_entry *base){
  struct proc_dir_entry *entry;

  DEBUG(4, "%s() for sock %u\n", __FUNCTION__, sock);

  if((entry=create_proc_entry("status", 0, base))==NULL){
    printk(KERN_ERR "Unable to install \"status\" procfs entry\n");
    return;
  }

  entry->read_proc=sa1100_pcmcia_proc_status;
  entry->data=(void *)sock;
}


/* sa1100_pcmcia_proc_status()
 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 * Implements the /proc/bus/pccard/??/status file.
 *
 * Returns: the number of characters added to the buffer
 */
static int sa1100_pcmcia_proc_status(char *buf, char **start, off_t pos,
				     int count, int *eof, void *data){
  char *p=buf;
  unsigned int sock=(unsigned int)data;
  unsigned int clock = get_cclk_frequency() * 100;
  unsigned long mecr = MECR;

  p+=sprintf(p, "k_flags  : %s%s%s%s%s%s%s\n", 
	     sa1100_pcmcia_socket[sock].k_state.detect?"detect ":"",
	     sa1100_pcmcia_socket[sock].k_state.ready?"ready ":"",
	     sa1100_pcmcia_socket[sock].k_state.bvd1?"bvd1 ":"",
	     sa1100_pcmcia_socket[sock].k_state.bvd2?"bvd2 ":"",
	     sa1100_pcmcia_socket[sock].k_state.wrprot?"wrprot ":"",
	     sa1100_pcmcia_socket[sock].k_state.vs_3v?"vs_3v ":"",
	     sa1100_pcmcia_socket[sock].k_state.vs_Xv?"vs_Xv ":"");

  p+=sprintf(p, "status   : %s%s%s%s%s%s%s%s%s\n",
	     sa1100_pcmcia_socket[sock].k_state.detect?"SS_DETECT ":"",
	     sa1100_pcmcia_socket[sock].k_state.ready?"SS_READY ":"",
	     sa1100_pcmcia_socket[sock].cs_state.Vcc?"SS_POWERON ":"",
	     sa1100_pcmcia_socket[sock].cs_state.flags&SS_IOCARD?\
	     "SS_IOCARD ":"",
	     (sa1100_pcmcia_socket[sock].cs_state.flags&SS_IOCARD &&
	      sa1100_pcmcia_socket[sock].k_state.bvd1)?"SS_STSCHG ":"",
	     ((sa1100_pcmcia_socket[sock].cs_state.flags&SS_IOCARD)==0 &&
	      (sa1100_pcmcia_socket[sock].k_state.bvd1==0))?"SS_BATDEAD ":"",
	     ((sa1100_pcmcia_socket[sock].cs_state.flags&SS_IOCARD)==0 &&
	      (sa1100_pcmcia_socket[sock].k_state.bvd2==0))?"SS_BATWARN ":"",
	     sa1100_pcmcia_socket[sock].k_state.vs_3v?"SS_3VCARD ":"",
	     sa1100_pcmcia_socket[sock].k_state.vs_Xv?"SS_XVCARD ":"");

  p+=sprintf(p, "mask     : %s%s%s%s%s\n",
	     sa1100_pcmcia_socket[sock].cs_state.csc_mask&SS_DETECT?\
	     "SS_DETECT ":"",
	     sa1100_pcmcia_socket[sock].cs_state.csc_mask&SS_READY?\
	     "SS_READY ":"",
	     sa1100_pcmcia_socket[sock].cs_state.csc_mask&SS_BATDEAD?\
	     "SS_BATDEAD ":"",
	     sa1100_pcmcia_socket[sock].cs_state.csc_mask&SS_BATWARN?\
	     "SS_BATWARN ":"",
	     sa1100_pcmcia_socket[sock].cs_state.csc_mask&SS_STSCHG?\
	     "SS_STSCHG ":"");

  p+=sprintf(p, "cs_flags : %s%s%s%s%s\n",
	     sa1100_pcmcia_socket[sock].cs_state.flags&SS_PWR_AUTO?\
	     "SS_PWR_AUTO ":"",
	     sa1100_pcmcia_socket[sock].cs_state.flags&SS_IOCARD?\
	     "SS_IOCARD ":"",
	     sa1100_pcmcia_socket[sock].cs_state.flags&SS_RESET?\
	     "SS_RESET ":"",
	     sa1100_pcmcia_socket[sock].cs_state.flags&SS_SPKR_ENA?\
	     "SS_SPKR_ENA ":"",
	     sa1100_pcmcia_socket[sock].cs_state.flags&SS_OUTPUT_ENA?\
	     "SS_OUTPUT_ENA ":"");

  p+=sprintf(p, "Vcc      : %d\n", sa1100_pcmcia_socket[sock].cs_state.Vcc);

  p+=sprintf(p, "Vpp      : %d\n", sa1100_pcmcia_socket[sock].cs_state.Vpp);

  p+=sprintf(p, "irq      : %d\n", sa1100_pcmcia_socket[sock].cs_state.io_irq);

  p+=sprintf(p, "I/O      : %u (%u)\n", sa1100_pcmcia_socket[sock].speed_io,
	     sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, sock)));

  p+=sprintf(p, "attribute: %u (%u)\n", sa1100_pcmcia_socket[sock].speed_attr,
	     sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, sock)));

  p+=sprintf(p, "common   : %u (%u)\n", sa1100_pcmcia_socket[sock].speed_mem,
	     sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, sock)));

  return p-buf;
}

#endif  /* defined(CONFIG_PROC_FS) */


#ifdef CONFIG_CPU_FREQ

/* sa1100_pcmcia_update_mecr()
 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 * When sa1100_pcmcia_notifier() decides that a MECR adjustment (due
 * to a core clock frequency change) is needed, this routine establishes
 * new BS_xx values consistent with the clock speed `clock'.
 */
static void sa1100_pcmcia_update_mecr(unsigned int clock){
  unsigned int sock;
  unsigned long mecr = MECR;

  for(sock = 0; sock < SA1100_PCMCIA_MAX_SOCK; ++sock){

    MECR_BSIO_SET(mecr, sock,
		  sa1100_pcmcia_mecr_bs(sa1100_pcmcia_socket[sock].speed_io,
					clock));
    MECR_BSA_SET(mecr, sock,
		 sa1100_pcmcia_mecr_bs(sa1100_pcmcia_socket[sock].speed_attr,
				       clock));
    MECR_BSM_SET(mecr, sock,
		 sa1100_pcmcia_mecr_bs(sa1100_pcmcia_socket[sock].speed_mem,
				       clock));
  }

  MECR = mecr;

}

/* sa1100_pcmcia_notifier()
 * ^^^^^^^^^^^^^^^^^^^^^^^^
 * When changing the processor core clock frequency, it is necessary
 * to adjust the MECR timings accordingly. We've recorded the timings
 * requested by Card Services, so this is just a matter of finding
 * out what our current speed is, and then recomputing the new MECR
 * values.
 *
 * Returns: 0 on success, -1 on error
 */
static int sa1100_pcmcia_notifier(struct notifier_block *nb,
				  unsigned long val, void *data){
  struct cpufreq_info *ci = data;

  switch(val){
  case CPUFREQ_MINMAX:

    break;

  case CPUFREQ_PRECHANGE:

    if(ci->new_freq > ci->old_freq){
      DEBUG(2, "%s(): new frequency %u.%uMHz > %u.%uMHz, pre-updating\n",
	    __FUNCTION__,
	    ci->new_freq / 1000, (ci->new_freq / 100) % 10,
	    ci->old_freq / 1000, (ci->old_freq / 100) % 10);
      sa1100_pcmcia_update_mecr(ci->new_freq);
    }

    break;

  case CPUFREQ_POSTCHANGE:

    if(ci->new_freq < ci->old_freq){
      DEBUG(2, "%s(): new frequency %u.%uMHz < %u.%uMHz, post-updating\n",
	    __FUNCTION__,
	    ci->new_freq / 1000, (ci->new_freq / 100) % 10,
	    ci->old_freq / 1000, (ci->old_freq / 100) % 10);
      sa1100_pcmcia_update_mecr(ci->new_freq);
    }

    break;

  default:
    printk(KERN_ERR "%s(): unknown CPU frequency event %lx\n", __FUNCTION__,
	   val);
    return -1;

  }

  return 0;

}

static struct notifier_block sa1100_pcmcia_notifier_block = {
  notifier_call: sa1100_pcmcia_notifier
};

#endif