drivers/ide/ide-devsets.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/ide.h>
   4
   5 DEFINE_MUTEX(ide_setting_mtx);
   6
   7 ide_devset_get(io_32bit, io_32bit);
   8
   9 static int set_io_32bit(ide_drive_t *drive, int arg)
  10 {
  11         if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
  12                 return -EPERM;
  13
  14         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
  15                 return -EINVAL;
  16
  17         drive->io_32bit = arg;
  18
  19         return 0;
  20 }
  21
  22 ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
  23
  24 static int set_ksettings(ide_drive_t *drive, int arg)
  25 {
  26         if (arg < 0 || arg > 1)
  27                 return -EINVAL;
  28
  29         if (arg)
  30                 drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
  31         else
  32                 drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
  33
  34         return 0;
  35 }
  36
  37 ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
  38
  39 static int set_using_dma(ide_drive_t *drive, int arg)
  40 {
  41 #ifdef CONFIG_BLK_DEV_IDEDMA
  42         int err = -EPERM;
  43
  44         if (arg < 0 || arg > 1)
  45                 return -EINVAL;
  46
  47         if (ata_id_has_dma(drive->id) == 0)
  48                 goto out;
  49
  50         if (drive->hwif->dma_ops == NULL)
  51                 goto out;
  52
  53         err = 0;
  54
  55         if (arg) {
  56                 if (ide_set_dma(drive))
  57                         err = -EIO;
  58         } else
  59                 ide_dma_off(drive);
  60
  61 out:
  62         return err;
  63 #else
  64         if (arg < 0 || arg > 1)
  65                 return -EINVAL;
  66
  67         return -EPERM;
  68 #endif
  69 }
  70
  71 /*
  72  * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
  73  */
  74 static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
  75 {
  76         switch (req_pio) {
  77         case 202:
  78         case 201:
  79         case 200:
  80         case 102:
  81         case 101:
  82         case 100:
  83                 return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
  84         case 9:
  85         case 8:
  86                 return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
  87         case 7:
  88         case 6:
  89                 return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
  90         default:
  91                 return 0;
  92         }
  93 }
  94
  95 static int set_pio_mode(ide_drive_t *drive, int arg)
  96 {
  97         ide_hwif_t *hwif = drive->hwif;
  98         const struct ide_port_ops *port_ops = hwif->port_ops;
  99
 100         if (arg < 0 || arg > 255)
 101                 return -EINVAL;
 102
 103         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 104             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 105                 return -ENOSYS;
 106
 107         if (set_pio_mode_abuse(drive->hwif, arg)) {
 108                 if (arg == 8 || arg == 9) {
 109                         unsigned long flags;
 110
 111                         /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
 112                         spin_lock_irqsave(&hwif->lock, flags);
 113                         port_ops->set_pio_mode(drive, arg);
 114                         spin_unlock_irqrestore(&hwif->lock, flags);
 115                 } else
 116                         port_ops->set_pio_mode(drive, arg);
 117         } else {
 118                 int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 119
 120                 ide_set_pio(drive, arg);
 121
 122                 if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
 123                         if (keep_dma)
 124                                 ide_dma_on(drive);
 125                 }
 126         }
 127
 128         return 0;
 129 }
 130
 131 ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
 132
 133 static int set_unmaskirq(ide_drive_t *drive, int arg)
 134 {
 135         if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
 136                 return -EPERM;
 137
 138         if (arg < 0 || arg > 1)
 139                 return -EINVAL;
 140
 141         if (arg)
 142                 drive->dev_flags |= IDE_DFLAG_UNMASK;
 143         else
 144                 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 145
 146         return 0;
 147 }
 148
 149 ide_ext_devset_rw_sync(io_32bit, io_32bit);
 150 ide_ext_devset_rw_sync(keepsettings, ksettings);
 151 ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
 152 ide_ext_devset_rw_sync(using_dma, using_dma);
 153 __IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
 154
 155 int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
 156                        int arg)
 157 {
 158         struct request_queue *q = drive->queue;
 159         struct request *rq;
 160         int ret = 0;
 161
 162         if (!(setting->flags & DS_SYNC))
 163                 return setting->set(drive, arg);
 164
 165         rq = blk_get_request(q, READ, __GFP_WAIT);
 166         rq->cmd_type = REQ_TYPE_SPECIAL;
 167         rq->cmd_len = 5;
 168         rq->cmd[0] = REQ_DEVSET_EXEC;
 169         *(int *)&rq->cmd[1] = arg;
 170         rq->special = setting->set;
 171
 172         if (blk_execute_rq(q, NULL, rq, 0))
 173                 ret = rq->errors;
 174         blk_put_request(rq);
 175
 176         return ret;
 177 }
 178
 179 ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq)
 180 {
 181         int err, (*setfunc)(ide_drive_t *, int) = rq->special;
 182
 183         err = setfunc(drive, *(int *)&rq->cmd[1]);
 184         if (err)
 185                 rq->errors = err;
 186         ide_complete_rq(drive, err, blk_rq_bytes(rq));
 187         return ide_stopped;
 188 }