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/hdreg.h>
  15 #include <linux/pci.h>
  16 #include <linux/delay.h>
  17 #include <linux/ide.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/io.h>
  21
  22 #ifdef CONFIG_SUPERIO
  23 /* SUPERIO 87560 is a PoS chip that NatSem denies exists.
  24  * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
  25  * which use the integrated NS87514 cell for CD-ROM support.
  26  * i.e we have to support for CD-ROM installs.
  27  * See drivers/parisc/superio.c for more gory details.
  28  */
  29 #include <asm/superio.h>
  30
  31 static unsigned long superio_ide_status[2];
  32 static unsigned long superio_ide_select[2];
  33 static unsigned long superio_ide_dma_status[2];
  34
  35 #define SUPERIO_IDE_MAX_RETRIES 25
  36
  37 /* Because of a defect in Super I/O, all reads of the PCI DMA status
  38  * registers, IDE status register and the IDE select register need to be
  39  * retried
  40  */
  41 static u8 superio_ide_inb (unsigned long port)
  42 {
  43         if (port == superio_ide_status[0] ||
  44             port == superio_ide_status[1] ||
  45             port == superio_ide_select[0] ||
  46             port == superio_ide_select[1] ||
  47             port == superio_ide_dma_status[0] ||
  48             port == superio_ide_dma_status[1]) {
  49                 u8 tmp;
  50                 int retries = SUPERIO_IDE_MAX_RETRIES;
  51
  52                 /* printk(" [ reading port 0x%x with retry ] ", port); */
  53
  54                 do {
  55                         tmp = inb(port);
  56                         if (tmp == 0)
  57                                 udelay(50);
  58                 } while (tmp == 0 && retries-- > 0);
  59
  60                 return tmp;
  61         }
  62
  63         return inb(port);
  64 }
  65
  66 static void __devinit superio_ide_init_iops (struct hwif_s *hwif)
  67 {
  68         struct pci_dev *pdev = to_pci_dev(hwif->dev);
  69         u32 base, dmabase;
  70         u8 port = hwif->channel, tmp;
  71
  72         base = pci_resource_start(pdev, port * 2) & ~3;
  73         dmabase = pci_resource_start(pdev, 4) & ~3;
  74
  75         superio_ide_status[port] = base + IDE_STATUS_OFFSET;
  76         superio_ide_select[port] = base + IDE_SELECT_OFFSET;
  77         superio_ide_dma_status[port] = dmabase + (!port ? 2 : 0xa);
  78
  79         /* Clear error/interrupt, enable dma */
  80         tmp = superio_ide_inb(superio_ide_dma_status[port]);
  81         outb(tmp | 0x66, superio_ide_dma_status[port]);
  82
  83         /* We need to override inb to workaround a SuperIO errata */
  84         hwif->INB = superio_ide_inb;
  85 }
  86
  87 static void __devinit init_iops_ns87415(ide_hwif_t *hwif)
  88 {
  89         struct pci_dev *dev = to_pci_dev(hwif->dev);
  90
  91         if (PCI_SLOT(dev->devfn) == 0xE)
  92                 /* Built-in - assume it's under superio. */
  93                 superio_ide_init_iops(hwif);
  94 }
  95 #endif
  96
  97 static unsigned int ns87415_count = 0, ns87415_control[MAX_HWIFS] = { 0 };
  98
  99 /*
 100  * This routine either enables/disables (according to drive->present)
 101  * the IRQ associated with the port (HWIF(drive)),
 102  * and selects either PIO or DMA handshaking for the next I/O operation.
 103  */
 104 static void ns87415_prepare_drive (ide_drive_t *drive, unsigned int use_dma)
 105 {
 106         ide_hwif_t *hwif = HWIF(drive);
 107         struct pci_dev *dev = to_pci_dev(hwif->dev);
 108         unsigned int bit, other, new, *old = (unsigned int *) hwif->select_data;
 109         unsigned long flags;
 110
 111         local_irq_save(flags);
 112         new = *old;
 113
 114         /* Adjust IRQ enable bit */
 115         bit = 1 << (8 + hwif->channel);
 116         new = drive->present ? (new & ~bit) : (new | bit);
 117
 118         /* Select PIO or DMA, DMA may only be selected for one drive/channel. */
 119         bit   = 1 << (20 + drive->select.b.unit       + (hwif->channel << 1));
 120         other = 1 << (20 + (1 - drive->select.b.unit) + (hwif->channel << 1));
 121         new = use_dma ? ((new & ~other) | bit) : (new & ~bit);
 122
 123         if (new != *old) {
 124                 unsigned char stat;
 125
 126                 /*
 127                  * Don't change DMA engine settings while Write Buffers
 128                  * are busy.
 129                  */
 130                 (void) pci_read_config_byte(dev, 0x43, &stat);
 131                 while (stat & 0x03) {
 132                         udelay(1);
 133                         (void) pci_read_config_byte(dev, 0x43, &stat);
 134                 }
 135
 136                 *old = new;
 137                 (void) pci_write_config_dword(dev, 0x40, new);
 138
 139                 /*
 140                  * And let things settle...
 141                  */
 142                 udelay(10);
 143         }
 144
 145         local_irq_restore(flags);
 146 }
 147
 148 static void ns87415_selectproc (ide_drive_t *drive)
 149 {
 150         ns87415_prepare_drive (drive, drive->using_dma);
 151 }
 152
 153 static int ns87415_dma_end(ide_drive_t *drive)
 154 {
 155         ide_hwif_t      *hwif = HWIF(drive);
 156         u8 dma_stat = 0, dma_cmd = 0;
 157
 158         drive->waiting_for_dma = 0;
 159         dma_stat = hwif->INB(hwif->dma_status);
 160         /* get dma command mode */
 161         dma_cmd = hwif->INB(hwif->dma_command);
 162         /* stop DMA */
 163         outb(dma_cmd & ~1, hwif->dma_command);
 164         /* from ERRATA: clear the INTR & ERROR bits */
 165         dma_cmd = hwif->INB(hwif->dma_command);
 166         outb(dma_cmd | 6, hwif->dma_command);
 167         /* and free any DMA resources */
 168         ide_destroy_dmatable(drive);
 169         /* verify good DMA status */
 170         return (dma_stat & 7) != 4;
 171 }
 172
 173 static int ns87415_dma_setup(ide_drive_t *drive)
 174 {
 175         /* select DMA xfer */
 176         ns87415_prepare_drive(drive, 1);
 177         if (!ide_dma_setup(drive))
 178                 return 0;
 179         /* DMA failed: select PIO xfer */
 180         ns87415_prepare_drive(drive, 0);
 181         return 1;
 182 }
 183
 184 #ifndef ide_default_irq
 185 #define ide_default_irq(irq) 0
 186 #endif
 187
 188 static void __devinit init_hwif_ns87415 (ide_hwif_t *hwif)
 189 {
 190         struct pci_dev *dev = to_pci_dev(hwif->dev);
 191         unsigned int ctrl, using_inta;
 192         u8 progif;
 193 #ifdef __sparc_v9__
 194         int timeout;
 195         u8 stat;
 196 #endif
 197
 198         /*
 199          * We cannot probe for IRQ: both ports share common IRQ on INTA.
 200          * Also, leave IRQ masked during drive probing, to prevent infinite
 201          * interrupts from a potentially floating INTA..
 202          *
 203          * IRQs get unmasked in selectproc when drive is first used.
 204          */
 205         (void) pci_read_config_dword(dev, 0x40, &ctrl);
 206         (void) pci_read_config_byte(dev, 0x09, &progif);
 207         /* is irq in "native" mode? */
 208         using_inta = progif & (1 << (hwif->channel << 1));
 209         if (!using_inta)
 210                 using_inta = ctrl & (1 << (4 + hwif->channel));
 211         if (hwif->mate) {
 212                 hwif->select_data = hwif->mate->select_data;
 213         } else {
 214                 hwif->select_data = (unsigned long)
 215                                         &ns87415_control[ns87415_count++];
 216                 ctrl |= (1 << 8) | (1 << 9);    /* mask both IRQs */
 217                 if (using_inta)
 218                         ctrl &= ~(1 << 6);      /* unmask INTA */
 219                 *((unsigned int *)hwif->select_data) = ctrl;
 220                 (void) pci_write_config_dword(dev, 0x40, ctrl);
 221
 222                 /*
 223                  * Set prefetch size to 512 bytes for both ports,
 224                  * but don't turn on/off prefetching here.
 225                  */
 226                 pci_write_config_byte(dev, 0x55, 0xee);
 227
 228 #ifdef __sparc_v9__
 229                 /*
 230                  * XXX: Reset the device, if we don't it will not respond to
 231                  *      SELECT_DRIVE() properly during first ide_probe_port().
 232                  */
 233                 timeout = 10000;
 234                 outb(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 235                 udelay(10);
 236                 outb(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 237                 do {
 238                         udelay(50);
 239                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 240                         if (stat == 0xff)
 241                                 break;
 242                 } while ((stat & BUSY_STAT) && --timeout);
 243 #endif
 244         }
 245
 246         if (!using_inta)
 247                 hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 248         else if (!hwif->irq && hwif->mate && hwif->mate->irq)
 249                 hwif->irq = hwif->mate->irq;    /* share IRQ with mate */
 250
 251         if (!hwif->dma_base)
 252                 return;
 253
 254         outb(0x60, hwif->dma_status);
 255 }
 256
 257 static const struct ide_port_ops ns87415_port_ops = {
 258         .selectproc             = ns87415_selectproc,
 259 };
 260
 261 static struct ide_dma_ops ns87415_dma_ops = {
 262         .dma_setup              = ns87415_dma_setup,
 263         .dma_end                = ns87415_dma_end,
 264 };
 265
 266 static const struct ide_port_info ns87415_chipset __devinitdata = {
 267         .name           = "NS87415",
 268 #ifdef CONFIG_SUPERIO
 269         .init_iops      = init_iops_ns87415,
 270 #endif
 271         .init_hwif      = init_hwif_ns87415,
 272         .port_ops       = &ns87415_port_ops,
 273         .dma_ops        = &ns87415_dma_ops,
 274         .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA |
 275                           IDE_HFLAG_NO_ATAPI_DMA,
 276 };
 277
 278 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 279 {
 280         return ide_setup_pci_device(dev, &ns87415_chipset);
 281 }
 282
 283 static const struct pci_device_id ns87415_pci_tbl[] = {
 284         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), 0 },
 285         { 0, },
 286 };
 287 MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl);
 288
 289 static struct pci_driver driver = {
 290         .name           = "NS87415_IDE",
 291         .id_table       = ns87415_pci_tbl,
 292         .probe          = ns87415_init_one,
 293 };
 294
 295 static int __init ns87415_ide_init(void)
 296 {
 297         return ide_pci_register_driver(&driver);
 298 }
 299
 300 module_init(ns87415_ide_init);
 301
 302 MODULE_AUTHOR("Mark Lord, Eddie Dost, Andre Hedrick");
 303 MODULE_DESCRIPTION("PCI driver module for NS87415 IDE");
 304 MODULE_LICENSE("GPL");