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_dev_select(ide_drive_t *drive)
  77 {
  78         ide_hwif_t *hwif = drive->hwif;
  79         u8 select = drive->select | ATA_DEVICE_OBS;
  80
  81         if (hwif->host_flags & IDE_HFLAG_MMIO)
  82                 writeb(select, (void __iomem *)hwif->io_ports.device_addr);
  83         else
  84                 outb(select, hwif->io_ports.device_addr);
  85 }
  86 EXPORT_SYMBOL_GPL(ide_dev_select);
  87
  88 void ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
  89 {
  90         ide_hwif_t *hwif = drive->hwif;
  91         struct ide_io_ports *io_ports = &hwif->io_ports;
  92         void (*tf_outb)(u8 addr, unsigned long port);
  93         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
  94
  95         if (mmio)
  96                 tf_outb = ide_mm_outb;
  97         else
  98                 tf_outb = ide_outb;
  99
 100         if (valid & IDE_VALID_FEATURE)
 101                 tf_outb(tf->feature, io_ports->feature_addr);
 102         if (valid & IDE_VALID_NSECT)
 103                 tf_outb(tf->nsect, io_ports->nsect_addr);
 104         if (valid & IDE_VALID_LBAL)
 105                 tf_outb(tf->lbal, io_ports->lbal_addr);
 106         if (valid & IDE_VALID_LBAM)
 107                 tf_outb(tf->lbam, io_ports->lbam_addr);
 108         if (valid & IDE_VALID_LBAH)
 109                 tf_outb(tf->lbah, io_ports->lbah_addr);
 110         if (valid & IDE_VALID_DEVICE)
 111                 tf_outb(tf->device, io_ports->device_addr);
 112 }
 113 EXPORT_SYMBOL_GPL(ide_tf_load);
 114
 115 void ide_tf_read(ide_drive_t *drive, struct ide_taskfile *tf, u8 valid)
 116 {
 117         ide_hwif_t *hwif = drive->hwif;
 118         struct ide_io_ports *io_ports = &hwif->io_ports;
 119         u8 (*tf_inb)(unsigned long port);
 120         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 121
 122         if (mmio)
 123                 tf_inb  = ide_mm_inb;
 124         else
 125                 tf_inb  = ide_inb;
 126
 127         if (valid & IDE_VALID_ERROR)
 128                 tf->error  = tf_inb(io_ports->feature_addr);
 129         if (valid & IDE_VALID_NSECT)
 130                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 131         if (valid & IDE_VALID_LBAL)
 132                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 133         if (valid & IDE_VALID_LBAM)
 134                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 135         if (valid & IDE_VALID_LBAH)
 136                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 137         if (valid & IDE_VALID_DEVICE)
 138                 tf->device = tf_inb(io_ports->device_addr);
 139 }
 140 EXPORT_SYMBOL_GPL(ide_tf_read);
 141
 142 /*
 143  * Some localbus EIDE interfaces require a special access sequence
 144  * when using 32-bit I/O instructions to transfer data.  We call this
 145  * the "vlb_sync" sequence, which consists of three successive reads
 146  * of the sector count register location, with interrupts disabled
 147  * to ensure that the reads all happen together.
 148  */
 149 static void ata_vlb_sync(unsigned long port)
 150 {
 151         (void)inb(port);
 152         (void)inb(port);
 153         (void)inb(port);
 154 }
 155
 156 /*
 157  * This is used for most PIO data transfers *from* the IDE interface
 158  *
 159  * These routines will round up any request for an odd number of bytes,
 160  * so if an odd len is specified, be sure that there's at least one
 161  * extra byte allocated for the buffer.
 162  */
 163 void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
 164                     unsigned int len)
 165 {
 166         ide_hwif_t *hwif = drive->hwif;
 167         struct ide_io_ports *io_ports = &hwif->io_ports;
 168         unsigned long data_addr = io_ports->data_addr;
 169         unsigned int words = (len + 1) >> 1;
 170         u8 io_32bit = drive->io_32bit;
 171         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 172
 173         if (io_32bit) {
 174                 unsigned long uninitialized_var(flags);
 175
 176                 if ((io_32bit & 2) && !mmio) {
 177                         local_irq_save(flags);
 178                         ata_vlb_sync(io_ports->nsect_addr);
 179                 }
 180
 181                 words >>= 1;
 182                 if (mmio)
 183                         __ide_mm_insl((void __iomem *)data_addr, buf, words);
 184                 else
 185                         insl(data_addr, buf, words);
 186
 187                 if ((io_32bit & 2) && !mmio)
 188                         local_irq_restore(flags);
 189
 190                 if (((len + 1) & 3) < 2)
 191                         return;
 192
 193                 buf += len & ~3;
 194                 words = 1;
 195         }
 196
 197         if (mmio)
 198                 __ide_mm_insw((void __iomem *)data_addr, buf, words);
 199         else
 200                 insw(data_addr, buf, words);
 201 }
 202 EXPORT_SYMBOL_GPL(ide_input_data);
 203
 204 /*
 205  * This is used for most PIO data transfers *to* the IDE interface
 206  */
 207 void ide_output_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_outsl((void __iomem *)data_addr, buf, words);
 228                 else
 229                         outsl(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_outsw((void __iomem *)data_addr, buf, words);
 243         else
 244                 outsw(data_addr, buf, words);
 245 }
 246 EXPORT_SYMBOL_GPL(ide_output_data);
 247
 248 const struct ide_tp_ops default_tp_ops = {
 249         .exec_command           = ide_exec_command,
 250         .read_status            = ide_read_status,
 251         .read_altstatus         = ide_read_altstatus,
 252         .write_devctl           = ide_write_devctl,
 253
 254         .dev_select             = ide_dev_select,
 255         .tf_load                = ide_tf_load,
 256         .tf_read                = ide_tf_read,
 257
 258         .input_data             = ide_input_data,
 259         .output_data            = ide_output_data,
 260 };