drivers/ide/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_dma_sff_read_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, struct ide_taskfile *tf,
  65                             u8 valid)
  66 {
  67         struct ide_io_ports *io_ports = &drive->hwif->io_ports;
  68
  69         if (valid & IDE_VALID_ERROR)
  70                 tf->error  = inb(io_ports->feature_addr);
  71         if (valid & IDE_VALID_NSECT)
  72                 tf->nsect  = inb(io_ports->nsect_addr);
  73         if (valid & IDE_VALID_LBAL)
  74                 tf->lbal   = inb(io_ports->lbal_addr);
  75         if (valid & IDE_VALID_LBAM)
  76                 tf->lbam   = inb(io_ports->lbam_addr);
  77         if (valid & IDE_VALID_LBAH)
  78                 tf->lbah   = inb(io_ports->lbah_addr);
  79         if (valid & IDE_VALID_DEVICE)
  80                 tf->device = superio_ide_inb(io_ports->device_addr);
  81 }
  82
  83 static void ns87415_dev_select(ide_drive_t *drive);
  84
  85 static const struct ide_tp_ops superio_tp_ops = {
  86         .exec_command           = ide_exec_command,
  87         .read_status            = superio_read_status,
  88         .read_altstatus         = ide_read_altstatus,
  89         .write_devctl           = ide_write_devctl,
  90
  91         .dev_select             = ns87415_dev_select,
  92         .tf_load                = ide_tf_load,
  93         .tf_read                = superio_tf_read,
  94
  95         .input_data             = ide_input_data,
  96         .output_data            = ide_output_data,
  97 };
  98
  99 static void __devinit superio_init_iops(struct hwif_s *hwif)
 100 {
 101         struct pci_dev *pdev = to_pci_dev(hwif->dev);
 102         u32 dma_stat;
 103         u8 port = hwif->channel, tmp;
 104
 105         dma_stat = (pci_resource_start(pdev, 4) & ~3) + (!port ? 2 : 0xa);
 106
 107         /* Clear error/interrupt, enable dma */
 108         tmp = superio_ide_inb(dma_stat);
 109         outb(tmp | 0x66, dma_stat);
 110 }
 111 #else
 112 #define superio_dma_sff_read_status ide_dma_sff_read_status
 113 #endif
 114
 115 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
 116
 117 /*
 118  * This routine either enables/disables (according to IDE_DFLAG_PRESENT)
 119  * the IRQ associated with the port,
 120  * and selects either PIO or DMA handshaking for the next I/O operation.
 121  */
 122 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
 123 {
 124         ide_hwif_t *hwif = drive->hwif;
 125         struct pci_dev *dev = to_pci_dev(hwif->dev);
 126         unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
 127         unsigned long flags;
 128
 129         local_irq_save(flags);
 130         new = *old;
 131
 132         /* Adjust IRQ enable bit */
 133         bit = 1 << (8 + hwif->channel);
 134
 135         if (drive->dev_flags & IDE_DFLAG_PRESENT)
 136                 new &= ~bit;
 137         else
 138                 new |= bit;
 139
 140         /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
 141         bit   = 1 << (20 + (drive->dn & 1) + (hwif->channel << 1));
 142         other = 1 << (20 + (1 - (drive->dn & 1)) + (hwif->channel << 1));
 143         new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
 144
 145         if (new != *old) {
 146                 unsigned char stat;
 147
 148                 /*
 149                  * Don't change DMA engine settings while Write Buffers
 150                  * are busy.
 151                  */
 152                 (void) pci_read_config_byte(dev, 0x43, &stat);
 153                 while (stat & 0x03) {
 154                         udelay(1);
 155                         (void) pci_read_config_byte(dev, 0x43, &stat);
 156                 }
 157
 158                 *old = new;
 159                 (void) pci_write_config_dword(dev, 0x40, new);
 160
 161                 /*
 162                  * And let things settle...
 163                  */
 164                 udelay(10);
 165         }
 166
 167         local_irq_restore(flags);
 168 }
 169
 170 static void ns87415_dev_select(ide_drive_t *drive)
 171 {
 172         ns87415_prepare_drive(drive,
 173                               !!(drive->dev_flags & IDE_DFLAG_USING_DMA));
 174
 175         outb(drive->select | ATA_DEVICE_OBS, drive->hwif->io_ports.device_addr);
 176 }
 177
 178 static void ns87415_dma_start(ide_drive_t *drive)
 179 {
 180         ns87415_prepare_drive(drive, 1);
 181         ide_dma_start(drive);
 182 }
 183
 184 static int ns87415_dma_end(ide_drive_t *drive)
 185 {
 186         ide_hwif_t *hwif = drive->hwif;
 187         u8 dma_stat = 0, dma_cmd = 0;
 188
 189         dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
 190         /* get DMA command mode */
 191         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 192         /* stop DMA */
 193         outb(dma_cmd & ~1, hwif->dma_base + ATA_DMA_CMD);
 194         /* from ERRATA: clear the INTR & ERROR bits */
 195         dma_cmd = inb(hwif->dma_base + ATA_DMA_CMD);
 196         outb(dma_cmd | 6, hwif->dma_base + ATA_DMA_CMD);
 197
 198         ns87415_prepare_drive(drive, 0);
 199
 200         /* verify good DMA status */
 201         return (dma_stat & 7) != 4;
 202 }
 203
 204 static void __devinit init_hwif_ns87415 (ide_hwif_t *hwif)
 205 {
 206         struct pci_dev *dev = to_pci_dev(hwif->dev);
 207         unsigned int ctrl, using_inta;
 208         u8 progif;
 209 #ifdef __sparc_v9__
 210         int timeout;
 211         u8 stat;
 212 #endif
 213
 214         /*
 215          * We cannot probe for IRQ: both ports share common IRQ on INTA.
 216          * Also, leave IRQ masked during drive probing, to prevent infinite
 217          * interrupts from a potentially floating INTA..
 218          *
 219          * IRQs get unmasked in dev_select() when drive is first used.
 220          */
 221         (void) pci_read_config_dword(dev, 0x40, &ctrl);
 222         (void) pci_read_config_byte(dev, 0x09, &progif);
 223         /* is irq in "native" mode? */
 224         using_inta = progif & (1 << (hwif->channel << 1));
 225         if (!using_inta)
 226                 using_inta = ctrl & (1 << (4 + hwif->channel));
 227         if (hwif->mate) {
 228                 hwif->select_data = hwif->mate->select_data;
 229         } else {
 230                 hwif->select_data = (unsigned long)
 231                                         &ns87415_control[ns87415_count++];
 232                 ctrl |= (1 << 8) | (1 << 9);    /* mask both IRQs */
 233                 if (using_inta)
 234                         ctrl &= ~(1 << 6);      /* unmask INTA */
 235                 *((unsigned int *)hwif->select_data) = ctrl;
 236                 (void) pci_write_config_dword(dev, 0x40, ctrl);
 237
 238                 /*
 239                  * Set prefetch size to 512 bytes for both ports,
 240                  * but don't turn on/off prefetching here.
 241                  */
 242                 pci_write_config_byte(dev, 0x55, 0xee);
 243
 244 #ifdef __sparc_v9__
 245                 /*
 246                  * XXX: Reset the device, if we don't it will not respond to
 247                  *      dev_select() properly during first ide_probe_port().
 248                  */
 249                 timeout = 10000;
 250                 outb(12, hwif->io_ports.ctl_addr);
 251                 udelay(10);
 252                 outb(8, hwif->io_ports.ctl_addr);
 253                 do {
 254                         udelay(50);
 255                         stat = hwif->tp_ops->read_status(hwif);
 256                         if (stat == 0xff)
 257                                 break;
 258                 } while ((stat & ATA_BUSY) && --timeout);
 259 #endif
 260         }
 261
 262         if (!using_inta)
 263                 hwif->irq = pci_get_legacy_ide_irq(dev, hwif->channel);
 264
 265         if (!hwif->dma_base)
 266                 return;
 267
 268         outb(0x60, hwif->dma_base + ATA_DMA_STATUS);
 269 }
 270
 271 static const struct ide_tp_ops ns87415_tp_ops = {
 272         .exec_command           = ide_exec_command,
 273         .read_status            = ide_read_status,
 274         .read_altstatus         = ide_read_altstatus,
 275         .write_devctl           = ide_write_devctl,
 276
 277         .dev_select             = ns87415_dev_select,
 278         .tf_load                = ide_tf_load,
 279         .tf_read                = ide_tf_read,
 280
 281         .input_data             = ide_input_data,
 282         .output_data            = ide_output_data,
 283 };
 284
 285 static const struct ide_dma_ops ns87415_dma_ops = {
 286         .dma_host_set           = ide_dma_host_set,
 287         .dma_setup              = ide_dma_setup,
 288         .dma_start              = ns87415_dma_start,
 289         .dma_end                = ns87415_dma_end,
 290         .dma_test_irq           = ide_dma_test_irq,
 291         .dma_lost_irq           = ide_dma_lost_irq,
 292         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 293         .dma_sff_read_status    = superio_dma_sff_read_status,
 294 };
 295
 296 static const struct ide_port_info ns87415_chipset __devinitconst = {
 297         .name           = DRV_NAME,
 298         .init_hwif      = init_hwif_ns87415,
 299         .tp_ops         = &ns87415_tp_ops,
 300         .dma_ops        = &ns87415_dma_ops,
 301         .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA |
 302                           IDE_HFLAG_NO_ATAPI_DMA,
 303 };
 304
 305 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 306 {
 307         struct ide_port_info d = ns87415_chipset;
 308
 309 #ifdef CONFIG_SUPERIO
 310         if (PCI_SLOT(dev->devfn) == 0xE) {
 311                 /* Built-in - assume it's under superio. */
 312                 d.init_iops = superio_init_iops;
 313                 d.tp_ops = &superio_tp_ops;
 314         }
 315 #endif
 316         return ide_pci_init_one(dev, &d, NULL);
 317 }
 318
 319 static const struct pci_device_id ns87415_pci_tbl[] = {
 320         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), 0 },
 321         { 0, },
 322 };
 323 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
 324
 325 static struct pci_driver ns87415_pci_driver = {
 326         .name           = "NS87415_IDE",
 327         .id_table       = ns87415_pci_tbl,
 328         .probe          = ns87415_init_one,
 329         .remove         = ide_pci_remove,
 330         .suspend        = ide_pci_suspend,
 331         .resume         = ide_pci_resume,
 332 };
 333
 334 static int __init ns87415_ide_init(void)
 335 {
 336         return ide_pci_register_driver(&ns87415_pci_driver);
 337 }
 338
 339 static void __exit ns87415_ide_exit(void)
 340 {
 341         pci_unregister_driver(&ns87415_pci_driver);
 342 }
 343
 344 module_init(ns87415_ide_init);
 345 module_exit(ns87415_ide_exit);
 346
 347 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
 348 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
 349 MODULE_LICENSE("GPL");