drivers/ide/ide-io-std.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/ide.h>
   4
   5 #if defined(CONFIG_ARM) || defined(CONFIG_M68K) || defined(CONFIG_MIPS) || \
   6     defined(CONFIG_PARISC) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
   7 #include <asm/ide.h>
   8 #else
   9 #include <asm-generic/ide_iops.h>
  10 #endif
  11
  12 /*
  13  *      Conventional PIO operations for ATA devices
  14  */
  15
  16 static u8 ide_inb(unsigned long port)
  17 {
  18         return (u8) inb(port);
  19 }
  20
  21 static void ide_outb(u8 val, unsigned long port)
  22 {
  23         outb(val, port);
  24 }
  25
  26 /*
  27  *      MMIO operations, typically used for SATA controllers
  28  */
  29
  30 static u8 ide_mm_inb(unsigned long port)
  31 {
  32         return (u8) readb((void __iomem *) port);
  33 }
  34
  35 static void ide_mm_outb(u8 value, unsigned long port)
  36 {
  37         writeb(value, (void __iomem *) port);
  38 }
  39
  40 void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
  41 {
  42         if (hwif->host_flags & IDE_HFLAG_MMIO)
  43                 writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
  44         else
  45                 outb(cmd, hwif->io_ports.command_addr);
  46 }
  47 EXPORT_SYMBOL_GPL(ide_exec_command);
  48
  49 u8 ide_read_status(ide_hwif_t *hwif)
  50 {
  51         if (hwif->host_flags & IDE_HFLAG_MMIO)
  52                 return readb((void __iomem *)hwif->io_ports.status_addr);
  53         else
  54                 return inb(hwif->io_ports.status_addr);
  55 }
  56 EXPORT_SYMBOL_GPL(ide_read_status);
  57
  58 u8 ide_read_altstatus(ide_hwif_t *hwif)
  59 {
  60         if (hwif->host_flags & IDE_HFLAG_MMIO)
  61                 return readb((void __iomem *)hwif->io_ports.ctl_addr);
  62         else
  63                 return inb(hwif->io_ports.ctl_addr);
  64 }
  65 EXPORT_SYMBOL_GPL(ide_read_altstatus);
  66
  67 void ide_write_devctl(ide_hwif_t *hwif, u8 ctl)
  68 {
  69         if (hwif->host_flags & IDE_HFLAG_MMIO)
  70                 writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
  71         else
  72                 outb(ctl, hwif->io_ports.ctl_addr);
  73 }
  74 EXPORT_SYMBOL_GPL(ide_write_devctl);
  75
  76 void ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd)
  77 {
  78         ide_hwif_t *hwif = drive->hwif;
  79         struct ide_io_ports *io_ports = &hwif->io_ports;
  80         struct ide_taskfile *tf = &cmd->tf;
  81         void (*tf_outb)(u8 addr, unsigned long port);
  82         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
  83         u8 HIHI = (cmd->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
  84
  85         if (mmio)
  86                 tf_outb = ide_mm_outb;
  87         else
  88                 tf_outb = ide_outb;
  89
  90         if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED)
  91                 HIHI = 0xFF;
  92
  93         if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) {
  94                 u8 data[2] = { tf->data, tf->hob_data };
  95
  96                 ide_output_data(drive, cmd, data, 2);
  97         }
  98
  99         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 100                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 101         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 102                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 103         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 104                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 105         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 106                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 107         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 108                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 109
 110         if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
 111                 tf_outb(tf->feature, io_ports->feature_addr);
 112         if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
 113                 tf_outb(tf->nsect, io_ports->nsect_addr);
 114         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
 115                 tf_outb(tf->lbal, io_ports->lbal_addr);
 116         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
 117                 tf_outb(tf->lbam, io_ports->lbam_addr);
 118         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
 119                 tf_outb(tf->lbah, io_ports->lbah_addr);
 120
 121         if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
 122                 tf_outb((tf->device & HIHI) | drive->select,
 123                          io_ports->device_addr);
 124 }
 125 EXPORT_SYMBOL_GPL(ide_tf_load);
 126
 127 void ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 128 {
 129         ide_hwif_t *hwif = drive->hwif;
 130         struct ide_io_ports *io_ports = &hwif->io_ports;
 131         struct ide_taskfile *tf = &cmd->tf;
 132         void (*tf_outb)(u8 addr, unsigned long port);
 133         u8 (*tf_inb)(unsigned long port);
 134         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 135
 136         if (mmio) {
 137                 tf_outb = ide_mm_outb;
 138                 tf_inb  = ide_mm_inb;
 139         } else {
 140                 tf_outb = ide_outb;
 141                 tf_inb  = ide_inb;
 142         }
 143
 144         if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) {
 145                 u8 data[2];
 146
 147                 ide_input_data(drive, cmd, data, 2);
 148
 149                 tf->data = data[0];
 150                 tf->hob_data = data[1];
 151         }
 152
 153         /* be sure we're looking at the low order bits */
 154         tf_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 155
 156         if (cmd->tf_flags & IDE_TFLAG_IN_ERROR)
 157                 tf->error  = tf_inb(io_ports->feature_addr);
 158         if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
 159                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 160         if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
 161                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 162         if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
 163                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 164         if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
 165                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 166         if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
 167                 tf->device = tf_inb(io_ports->device_addr);
 168
 169         if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 170                 tf_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 171
 172                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR)
 173                         tf->hob_error = tf_inb(io_ports->feature_addr);
 174                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 175                         tf->hob_nsect = tf_inb(io_ports->nsect_addr);
 176                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 177                         tf->hob_lbal  = tf_inb(io_ports->lbal_addr);
 178                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 179                         tf->hob_lbam  = tf_inb(io_ports->lbam_addr);
 180                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 181                         tf->hob_lbah  = tf_inb(io_ports->lbah_addr);
 182         }
 183 }
 184 EXPORT_SYMBOL_GPL(ide_tf_read);
 185
 186 /*
 187  * Some localbus EIDE interfaces require a special access sequence
 188  * when using 32-bit I/O instructions to transfer data.  We call this
 189  * the "vlb_sync" sequence, which consists of three successive reads
 190  * of the sector count register location, with interrupts disabled
 191  * to ensure that the reads all happen together.
 192  */
 193 static void ata_vlb_sync(unsigned long port)
 194 {
 195         (void)inb(port);
 196         (void)inb(port);
 197         (void)inb(port);
 198 }
 199
 200 /*
 201  * This is used for most PIO data transfers *from* the IDE interface
 202  *
 203  * These routines will round up any request for an odd number of bytes,
 204  * so if an odd len is specified, be sure that there's at least one
 205  * extra byte allocated for the buffer.
 206  */
 207 void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
 208                     unsigned int len)
 209 {
 210         ide_hwif_t *hwif = drive->hwif;
 211         struct ide_io_ports *io_ports = &hwif->io_ports;
 212         unsigned long data_addr = io_ports->data_addr;
 213         unsigned int words = (len + 1) >> 1;
 214         u8 io_32bit = drive->io_32bit;
 215         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 216
 217         if (io_32bit) {
 218                 unsigned long uninitialized_var(flags);
 219
 220                 if ((io_32bit & 2) && !mmio) {
 221                         local_irq_save(flags);
 222                         ata_vlb_sync(io_ports->nsect_addr);
 223                 }
 224
 225                 words >>= 1;
 226                 if (mmio)
 227                         __ide_mm_insl((void __iomem *)data_addr, buf, words);
 228                 else
 229                         insl(data_addr, buf, words);
 230
 231                 if ((io_32bit & 2) && !mmio)
 232                         local_irq_restore(flags);
 233
 234                 if (((len + 1) & 3) < 2)
 235                         return;
 236
 237                 buf += len & ~3;
 238                 words = 1;
 239         }
 240
 241         if (mmio)
 242                 __ide_mm_insw((void __iomem *)data_addr, buf, words);
 243         else
 244                 insw(data_addr, buf, words);
 245 }
 246 EXPORT_SYMBOL_GPL(ide_input_data);
 247
 248 /*
 249  * This is used for most PIO data transfers *to* the IDE interface
 250  */
 251 void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
 252                      unsigned int len)
 253 {
 254         ide_hwif_t *hwif = drive->hwif;
 255         struct ide_io_ports *io_ports = &hwif->io_ports;
 256         unsigned long data_addr = io_ports->data_addr;
 257         unsigned int words = (len + 1) >> 1;
 258         u8 io_32bit = drive->io_32bit;
 259         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 260
 261         if (io_32bit) {
 262                 unsigned long uninitialized_var(flags);
 263
 264                 if ((io_32bit & 2) && !mmio) {
 265                         local_irq_save(flags);
 266                         ata_vlb_sync(io_ports->nsect_addr);
 267                 }
 268
 269                 words >>= 1;
 270                 if (mmio)
 271                         __ide_mm_outsl((void __iomem *)data_addr, buf, words);
 272                 else
 273                         outsl(data_addr, buf, words);
 274
 275                 if ((io_32bit & 2) && !mmio)
 276                         local_irq_restore(flags);
 277
 278                 if (((len + 1) & 3) < 2)
 279                         return;
 280
 281                 buf += len & ~3;
 282                 words = 1;
 283         }
 284
 285         if (mmio)
 286                 __ide_mm_outsw((void __iomem *)data_addr, buf, words);
 287         else
 288                 outsw(data_addr, buf, words);
 289 }
 290 EXPORT_SYMBOL_GPL(ide_output_data);
 291
 292 const struct ide_tp_ops default_tp_ops = {
 293         .exec_command           = ide_exec_command,
 294         .read_status            = ide_read_status,
 295         .read_altstatus         = ide_read_altstatus,
 296         .write_devctl           = ide_write_devctl,
 297
 298         .tf_load                = ide_tf_load,
 299         .tf_read                = ide_tf_read,
 300
 301         .input_data             = ide_input_data,
 302         .output_data            = ide_output_data,
 303 };