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->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
  94                 tf_outb(tf->hob_feature, io_ports->feature_addr);
  95         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
  96                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
  97         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
  98                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
  99         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 100                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 101         if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 102                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 103
 104         if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE)
 105                 tf_outb(tf->feature, io_ports->feature_addr);
 106         if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT)
 107                 tf_outb(tf->nsect, io_ports->nsect_addr);
 108         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL)
 109                 tf_outb(tf->lbal, io_ports->lbal_addr);
 110         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM)
 111                 tf_outb(tf->lbam, io_ports->lbam_addr);
 112         if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH)
 113                 tf_outb(tf->lbah, io_ports->lbah_addr);
 114
 115         if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE)
 116                 tf_outb((tf->device & HIHI) | drive->select,
 117                          io_ports->device_addr);
 118 }
 119 EXPORT_SYMBOL_GPL(ide_tf_load);
 120
 121 void ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd)
 122 {
 123         ide_hwif_t *hwif = drive->hwif;
 124         struct ide_io_ports *io_ports = &hwif->io_ports;
 125         struct ide_taskfile *tf = &cmd->tf;
 126         void (*tf_outb)(u8 addr, unsigned long port);
 127         u8 (*tf_inb)(unsigned long port);
 128         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 129
 130         if (mmio) {
 131                 tf_outb = ide_mm_outb;
 132                 tf_inb  = ide_mm_inb;
 133         } else {
 134                 tf_outb = ide_outb;
 135                 tf_inb  = ide_inb;
 136         }
 137
 138         /* be sure we're looking at the low order bits */
 139         tf_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr);
 140
 141         if (cmd->tf_flags & IDE_TFLAG_IN_ERROR)
 142                 tf->error  = tf_inb(io_ports->feature_addr);
 143         if (cmd->tf_flags & IDE_TFLAG_IN_NSECT)
 144                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 145         if (cmd->tf_flags & IDE_TFLAG_IN_LBAL)
 146                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 147         if (cmd->tf_flags & IDE_TFLAG_IN_LBAM)
 148                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 149         if (cmd->tf_flags & IDE_TFLAG_IN_LBAH)
 150                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 151         if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE)
 152                 tf->device = tf_inb(io_ports->device_addr);
 153
 154         if (cmd->tf_flags & IDE_TFLAG_LBA48) {
 155                 tf_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr);
 156
 157                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR)
 158                         tf->hob_error = tf_inb(io_ports->feature_addr);
 159                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 160                         tf->hob_nsect = tf_inb(io_ports->nsect_addr);
 161                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 162                         tf->hob_lbal  = tf_inb(io_ports->lbal_addr);
 163                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 164                         tf->hob_lbam  = tf_inb(io_ports->lbam_addr);
 165                 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 166                         tf->hob_lbah  = tf_inb(io_ports->lbah_addr);
 167         }
 168 }
 169 EXPORT_SYMBOL_GPL(ide_tf_read);
 170
 171 /*
 172  * Some localbus EIDE interfaces require a special access sequence
 173  * when using 32-bit I/O instructions to transfer data.  We call this
 174  * the "vlb_sync" sequence, which consists of three successive reads
 175  * of the sector count register location, with interrupts disabled
 176  * to ensure that the reads all happen together.
 177  */
 178 static void ata_vlb_sync(unsigned long port)
 179 {
 180         (void)inb(port);
 181         (void)inb(port);
 182         (void)inb(port);
 183 }
 184
 185 /*
 186  * This is used for most PIO data transfers *from* the IDE interface
 187  *
 188  * These routines will round up any request for an odd number of bytes,
 189  * so if an odd len is specified, be sure that there's at least one
 190  * extra byte allocated for the buffer.
 191  */
 192 void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
 193                     unsigned int len)
 194 {
 195         ide_hwif_t *hwif = drive->hwif;
 196         struct ide_io_ports *io_ports = &hwif->io_ports;
 197         unsigned long data_addr = io_ports->data_addr;
 198         unsigned int words = (len + 1) >> 1;
 199         u8 io_32bit = drive->io_32bit;
 200         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 201
 202         if (io_32bit) {
 203                 unsigned long uninitialized_var(flags);
 204
 205                 if ((io_32bit & 2) && !mmio) {
 206                         local_irq_save(flags);
 207                         ata_vlb_sync(io_ports->nsect_addr);
 208                 }
 209
 210                 words >>= 1;
 211                 if (mmio)
 212                         __ide_mm_insl((void __iomem *)data_addr, buf, words);
 213                 else
 214                         insl(data_addr, buf, words);
 215
 216                 if ((io_32bit & 2) && !mmio)
 217                         local_irq_restore(flags);
 218
 219                 if (((len + 1) & 3) < 2)
 220                         return;
 221
 222                 buf += len & ~3;
 223                 words = 1;
 224         }
 225
 226         if (mmio)
 227                 __ide_mm_insw((void __iomem *)data_addr, buf, words);
 228         else
 229                 insw(data_addr, buf, words);
 230 }
 231 EXPORT_SYMBOL_GPL(ide_input_data);
 232
 233 /*
 234  * This is used for most PIO data transfers *to* the IDE interface
 235  */
 236 void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
 237                      unsigned int len)
 238 {
 239         ide_hwif_t *hwif = drive->hwif;
 240         struct ide_io_ports *io_ports = &hwif->io_ports;
 241         unsigned long data_addr = io_ports->data_addr;
 242         unsigned int words = (len + 1) >> 1;
 243         u8 io_32bit = drive->io_32bit;
 244         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 245
 246         if (io_32bit) {
 247                 unsigned long uninitialized_var(flags);
 248
 249                 if ((io_32bit & 2) && !mmio) {
 250                         local_irq_save(flags);
 251                         ata_vlb_sync(io_ports->nsect_addr);
 252                 }
 253
 254                 words >>= 1;
 255                 if (mmio)
 256                         __ide_mm_outsl((void __iomem *)data_addr, buf, words);
 257                 else
 258                         outsl(data_addr, buf, words);
 259
 260                 if ((io_32bit & 2) && !mmio)
 261                         local_irq_restore(flags);
 262
 263                 if (((len + 1) & 3) < 2)
 264                         return;
 265
 266                 buf += len & ~3;
 267                 words = 1;
 268         }
 269
 270         if (mmio)
 271                 __ide_mm_outsw((void __iomem *)data_addr, buf, words);
 272         else
 273                 outsw(data_addr, buf, words);
 274 }
 275 EXPORT_SYMBOL_GPL(ide_output_data);
 276
 277 const struct ide_tp_ops default_tp_ops = {
 278         .exec_command           = ide_exec_command,
 279         .read_status            = ide_read_status,
 280         .read_altstatus         = ide_read_altstatus,
 281         .write_devctl           = ide_write_devctl,
 282
 283         .tf_load                = ide_tf_load,
 284         .tf_read                = ide_tf_read,
 285
 286         .input_data             = ide_input_data,
 287         .output_data            = ide_output_data,
 288 };