drivers/ide/pci/ns87415.c

   1 /*
   2  * Copyright (C) 1997-1998      Mark Lord <mlord@pobox.com>
   3  * Copyright (C) 1998           Eddie C. Dost <ecd@skynet.be>
   4  * Copyright (C) 1999-2000      Andre Hedrick <andre@linux-ide.org>
   5  * Copyright (C) 2004           Grant Grundler <grundler at parisc-linux.org>
   6  *
   7  * Inspired by an earlier effort from David S. Miller <davem@redhat.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/pci.h>
  15 #include <linux/delay.h>
  16 #include <linux/ide.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/io.h>
  20
  21 #define DRV_NAME "ns87415"
  22
  23 #ifdef CONFIG_SUPERIO
  24 /* SUPERIO 87560 is a PoS chip that NatSem denies exists.
  25  * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
  26  * which use the integrated NS87514 cell for CD-ROM support.
  27  * i.e we have to support for CD-ROM installs.
  28  * See drivers/parisc/superio.c for more gory details.
  29  */
  30 #include <asm/superio.h>
  31
  32 #define SUPERIO_IDE_MAX_RETRIES 25
  33
  34 /* Because of a defect in Super I/O, all reads of the PCI DMA status
  35  * registers, IDE status register and the IDE select register need to be
  36  * retried
  37  */
  38 static u8 superio_ide_inb (unsigned long port)
  39 {
  40         u8 tmp;
  41         int retries = SUPERIO_IDE_MAX_RETRIES;
  42
  43         /* printk(" [ reading port 0x%x with retry ] ", port); */
  44
  45         do {
  46                 tmp = inb(port);
  47                 if (tmp == 0)
  48                         udelay(50);
  49         } while (tmp == 0 && retries-- > 0);
  50
  51         return tmp;
  52 }
  53
  54 static u8 superio_read_status(ide_hwif_t *hwif)
  55 {
  56         return superio_ide_inb(hwif->io_ports.status_addr);
  57 }
  58
  59 static u8 superio_read_sff_dma_status(ide_hwif_t *hwif)
  60 {
  61         return superio_ide_inb(hwif->dma_base + ATA_DMA_STATUS);
  62 }
  63
  64 static void superio_tf_read(ide_drive_t *drive, ide_task_t *task)
  65 {
  66         struct ide_io_ports *io_ports = &drive->hwif->io_ports;
  67         struct ide_taskfile *tf = &task->tf;
  68
  69         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
  70                 u16 data = inw(io_ports->data_addr);
  71
  72                 tf->data = data & 0xff;
  73                 tf->hob_data = (data >> 8) & 0xff;
  74         }
  75
  76         /* be sure we're looking at the low order bits */
  77         outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
  78
  79         if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
  80                 tf->feature = inb(io_ports->feature_addr);
  81         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
  82                 tf->nsect  = inb(io_ports->nsect_addr);
  83         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
  84                 tf->lbal   = inb(io_ports->lbal_addr);
  85         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
  86                 tf->lbam   = inb(io_ports->lbam_addr);
  87         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
  88                 tf->lbah   = inb(io_ports->lbah_addr);
  89         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
  90                 tf->device = superio_ide_inb(io_ports->device_addr);
  91
  92         if (task->tf_flags & IDE_TFLAG_LBA48) {
  93                 outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
  94
  95                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
  96                         tf->hob_feature = inb(io_ports->feature_addr);
  97                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
  98                         tf->hob_nsect   = inb(io_ports->nsect_addr);
  99                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 100                         tf->hob_lbal    = inb(io_ports->lbal_addr);
 101                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 102                         tf->hob_lbam    = inb(io_ports->lbam_addr);
 103                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 104                         tf->hob_lbah    = inb(io_ports->lbah_addr);
 105         }
 106 }
 107
 108 static const struct ide_tp_ops superio_tp_ops = {
 109         .exec_command           = ide_exec_command,
 110         .read_status            = superio_read_status,
 111         .read_altstatus         = ide_read_altstatus,
 112         .read_sff_dma_status    = superio_read_sff_dma_status,
 113
 114         .set_irq                = ide_set_irq,
 115
 116         .tf_load                = ide_tf_load,
 117         .tf_read                = superio_tf_read,
 118
 119         .input_data             = ide_input_data,
 120         .output_data            = ide_output_data,
 121 };
 122
 123 static void __devinit superio_init_iops(struct hwif_s *hwif)
 124 {
 125         struct pci_dev *pdev = to_pci_dev(hwif->dev);
 126         u32 dma_stat;
 127         u8 port = hwif->channel, tmp;
 128
 129         dma_stat = (pci_resource_start(pdev, 4) & ~3) + (!port ? 2 : 0xa);
 130
 131         /* Clear error/interrupt, enable dma */
 132         tmp = superio_ide_inb(dma_stat);
 133         outb(tmp | 0x66, dma_stat);
 134 }
 135 #endif
 136
 137 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
 138
 139 /*
 140  * This routine either enables/disables (according to drive->present)
 141  * the IRQ associated with the port (HWIF(drive)),
 142  * and selects either PIO or DMA handshaking for the next I/O operation.
 143  */
 144 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
 145 {
 146         ide_hwif_t *hwif = HWIF(drive);
 147         struct pci_dev *dev = to_pci_dev(hwif->dev);
 148         unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
 149         unsigned long flags;
 150
 151         local_irq_save(flags);
 152         new = *old;
 153
 154         /* Adjust IRQ enable bit */
 155         bit = 1 << (8 + hwif->channel);
 156         new = drive->present ? (new & ~bit) : (new | bit);
 157
 158         /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
 159         bit   = 1 << (20 + drive->select.b.unit       + (hwif->channel << 1));
 160         other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
 161         new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
 162
 163         if (new != *old) {
 164                 unsigned char stat;
 165
 166                 /*
 167                  * Don't change DMA engine settings while Write Buffers
 168                  * are busy.
 169                  */
 170                 (void) pci_read_config_byte(dev, 0x43, &stat);
 171                 while (stat & 0x03) {
 172                         udelay(1);
 173                         (void) pci_read_config_byte(dev, 0x43, &stat);
 174                 }
 175
 176                 *old = new;
 177                 (void) pci_write_config_dword(dev, 0x40, new);
 178
 179                 /*
 180                  * And let things settle...
 181                  */
 182                 udelay(10);
 183         }
 184
 185         local_irq_restore(flags);
 186 }
 187
 188 static void ns87415_selectproc (ide_drive_t *drive)
 189 {
 190         ns87415_prepare_drive (drive, drive->using_dma);
 191 }
 192
 193 static int ns87415_dma_end(ide_drive_t *drive)
 194 {
 195         ide_hwif_t      *hwif = HWIF(drive);
 196         u8 dma_stat = 0, dma_cmd = 0;
 197
 198         drive->waiting_for_dma = 0;
 199         dma_stat = hwif->tp_ops->read_sff_dma_status(hwif);
 200         /* get DMA command mode */
 201         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 202         /* stop DMA */
 203         outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
 204         /* from ERRATA: clear the INTR & ERROR bits */
 205         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 206         outb(dma_cmd | 6, hwif->dma_base + ATA_DMA_CMD);
 207         /* and free any DMA resources */
 208         ide_destroy_dmatable(drive);
 209         /* verify good DMA status */
 210         return (dma_stat & 7) != 4;
 211 }
 212
 213 static int ns87415_dma_setup(ide_drive_t *drive)
 214 {
 215         /* select DMA xfer */
 216         ns87415_prepare_drive(drive, 1);
 217         if (!ide_dma_setup(drive))
 218                 return 0;
 219         /* DMA failed: select PIO xfer */
 220         ns87415_prepare_drive(drive, 0);
 221         return 1;
 222 }
 223
 224 static void __devinit init_hwif_ns87415 (ide_hwif_t *hwif)
 225 {
 226         struct pci_dev *dev = to_pci_dev(hwif->dev);
 227         unsigned int ctrl, using_inta;
 228         u8 progif;
 229 #ifdef __sparc_v9__
 230         int timeout;
 231         u8 stat;
 232 #endif
 233
 234         /*
 235          * We cannot probe for IRQ: both ports share common IRQ on INTA.
 236          * Also, leave IRQ masked during drive probing, to prevent infinite
 237          * interrupts from a potentially floating INTA..
 238          *
 239          * IRQs get unmasked in selectproc when drive is first used.
 240          */
 241         (void) pci_read_config_dword(dev, 0x40, &ctrl);
 242         (void) pci_read_config_byte(dev, 0x09, &progif);
 243         /* is irq in "native" mode? */
 244         using_inta = progif & (1 << (hwif->channel << 1));
 245         if (!using_inta)
 246                 using_inta = ctrl & (1 << (4 + hwif->channel));
 247         if (hwif->mate) {
 248                 hwif->select_data = hwif->mate->select_data;
 249         } else {
 250                 hwif->select_data = (unsigned long)
 251                                         &ns87415_control[ns87415_count++];
 252                 ctrl |= (1 << 8) | (1 << 9);    /* mask both IRQs */
 253                 if (using_inta)
 254                         ctrl &= ~(1 << 6);      /* unmask INTA */
 255                 *((unsigned int *)hwif->select_data) = ctrl;
 256                 (void) pci_write_config_dword(dev, 0x40, ctrl);
 257
 258                 /*
 259                  * Set prefetch size to 512 bytes for both ports,
 260                  * but don't turn on/off prefetching here.
 261                  */
 262                 pci_write_config_byte(dev, 0x55, 0xee);
 263
 264 #ifdef __sparc_v9__
 265                 /*
 266                  * XXX: Reset the device, if we don't it will not respond to
 267                  *      SELECT_DRIVE() properly during first ide_probe_port().
 268                  */
 269                 timeout = 10000;
 270                 outb(12, hwif->io_ports.ctl_addr);
 271                 udelay(10);
 272                 outb(8, hwif->io_ports.ctl_addr);
 273                 do {
 274                         udelay(50);
 275                         stat = hwif->tp_ops->read_status(hwif);
 276                         if (stat == 0xff)
 277                                 break;
 278                 } while ((stat & ATA_BUSY) && --timeout);
 279 #endif
 280         }
 281
 282         if (!using_inta)
 283                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
 284         else if (!hwif->irq && hwif->mate && hwif->mate->irq)
 285                 hwif->irq = hwif->mate->irq;    /* share IRQ with mate */
 286
 287         if (!hwif->dma_base)
 288                 return;
 289
 290         outb(0x60, hwif->dma_base + ATA_DMA_STATUS);
 291 }
 292
 293 static const struct ide_port_ops ns87415_port_ops = {
 294         .selectproc             = ns87415_selectproc,
 295 };
 296
 297 static const struct ide_dma_ops ns87415_dma_ops = {
 298         .dma_host_set           = ide_dma_host_set,
 299         .dma_setup              = ns87415_dma_setup,
 300         .dma_exec_cmd           = ide_dma_exec_cmd,
 301         .dma_start              = ide_dma_start,
 302         .dma_end                = ns87415_dma_end,
 303         .dma_test_irq           = ide_dma_test_irq,
 304         .dma_lost_irq           = ide_dma_lost_irq,
 305         .dma_timeout            = ide_dma_timeout,
 306 };
 307
 308 static const struct ide_port_info ns87415_chipset __devinitdata = {
 309         .name           = DRV_NAME,
 310         .init_hwif      = init_hwif_ns87415,
 311         .port_ops       = &ns87415_port_ops,
 312         .dma_ops        = &ns87415_dma_ops,
 313         .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA |
 314                           IDE_HFLAG_NO_ATAPI_DMA,
 315 };
 316
 317 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 318 {
 319         struct ide_port_info d = ns87415_chipset;
 320
 321 #ifdef CONFIG_SUPERIO
 322         if (PCI_SLOT(dev->devfn) == 0xE) {
 323                 /* Built-in - assume it's under superio. */
 324                 d.init_iops = superio_init_iops;
 325                 d.tp_ops = &superio_tp_ops;
 326         }
 327 #endif
 328         return ide_pci_init_one(dev, &d, NULL);
 329 }
 330
 331 static const struct pci_device_id ns87415_pci_tbl[] = {
 332         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), 0 },
 333         { 0, },
 334 };
 335 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
 336
 337 static struct pci_driver driver = {
 338         .name           = "NS87415_IDE",
 339         .id_table       = ns87415_pci_tbl,
 340         .probe          = ns87415_init_one,
 341         .remove         = ide_pci_remove,
 342 };
 343
 344 static int __init ns87415_ide_init(void)
 345 {
 346         return ide_pci_register_driver(&driver);
 347 }
 348
 349 static void __exit ns87415_ide_exit(void)
 350 {
 351         pci_unregister_driver(&driver);
 352 }
 353
 354 module_init(ns87415_ide_init);
 355 module_exit(ns87415_ide_exit);
 356
 357 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
 358 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
 359 MODULE_LICENSE("GPL");