drivers/ata/pata_cs5530.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * pata-cs5530.c        - CS5530 PATA for new ATA layer
   4  *                        (C) 2005 Red Hat Inc
   5  *
   6  * based upon cs5530.c by Mark Lord.
   7  *
   8  * Loosely based on the piix & svwks drivers.
   9  *
  10  * Documentation:
  11  *      Available from AMD web site.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/delay.h>
  19 #include <scsi/scsi_host.h>
  20 #include <linux/libata.h>
  21 #include <linux/dmi.h>
  22
  23 #define DRV_NAME        "pata_cs5530"
  24 #define DRV_VERSION     "0.7.4"
  25
  26 static void __iomem *cs5530_port_base(struct ata_port *ap)
  27 {
  28         unsigned long bmdma = (unsigned long)ap->ioaddr.bmdma_addr;
  29
  30         return (void __iomem *)((bmdma & ~0x0F) + 0x20 + 0x10 * ap->port_no);
  31 }
  32
  33 /**
  34  *      cs5530_set_piomode              -       PIO setup
  35  *      @ap: ATA interface
  36  *      @adev: device on the interface
  37  *
  38  *      Set our PIO requirements. This is fairly simple on the CS5530
  39  *      chips.
  40  */
  41
  42 static void cs5530_set_piomode(struct ata_port *ap, struct ata_device *adev)
  43 {
  44         static const unsigned int cs5530_pio_timings[2][5] = {
  45                 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
  46                 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
  47         };
  48         void __iomem *base = cs5530_port_base(ap);
  49         u32 tuning;
  50         int format;
  51
  52         /* Find out which table to use */
  53         tuning = ioread32(base + 0x04);
  54         format = (tuning & 0x80000000UL) ? 1 : 0;
  55
  56         /* Now load the right timing register */
  57         if (adev->devno)
  58                 base += 0x08;
  59
  60         iowrite32(cs5530_pio_timings[format][adev->pio_mode - XFER_PIO_0], base);
  61 }
  62
  63 /**
  64  *      cs5530_set_dmamode              -       DMA timing setup
  65  *      @ap: ATA interface
  66  *      @adev: Device being configured
  67  *
  68  *      We cannot mix MWDMA and UDMA without reloading timings each switch
  69  *      master to slave. We track the last DMA setup in order to minimise
  70  *      reloads.
  71  */
  72
  73 static void cs5530_set_dmamode(struct ata_port *ap, struct ata_device *adev)
  74 {
  75         void __iomem *base = cs5530_port_base(ap);
  76         u32 tuning, timing = 0;
  77         u8 reg;
  78
  79         /* Find out which table to use */
  80         tuning = ioread32(base + 0x04);
  81
  82         switch(adev->dma_mode) {
  83                 case XFER_UDMA_0:
  84                         timing  = 0x00921250;break;
  85                 case XFER_UDMA_1:
  86                         timing  = 0x00911140;break;
  87                 case XFER_UDMA_2:
  88                         timing  = 0x00911030;break;
  89                 case XFER_MW_DMA_0:
  90                         timing  = 0x00077771;break;
  91                 case XFER_MW_DMA_1:
  92                         timing  = 0x00012121;break;
  93                 case XFER_MW_DMA_2:
  94                         timing  = 0x00002020;break;
  95                 default:
  96                         BUG();
  97         }
  98         /* Merge in the PIO format bit */
  99         timing |= (tuning & 0x80000000UL);
 100         if (adev->devno == 0) /* Master */
 101                 iowrite32(timing, base + 0x04);
 102         else {
 103                 if (timing & 0x00100000)
 104                         tuning |= 0x00100000;   /* UDMA for both */
 105                 else
 106                         tuning &= ~0x00100000;  /* MWDMA for both */
 107                 iowrite32(tuning, base + 0x04);
 108                 iowrite32(timing, base + 0x0C);
 109         }
 110
 111         /* Set the DMA capable bit in the BMDMA area */
 112         reg = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
 113         reg |= (1 << (5 + adev->devno));
 114         iowrite8(reg, ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
 115
 116         /* Remember the last DMA setup we did */
 117
 118         ap->private_data = adev;
 119 }
 120
 121 /**
 122  *      cs5530_qc_issue         -       command issue
 123  *      @qc: command pending
 124  *
 125  *      Called when the libata layer is about to issue a command. We wrap
 126  *      this interface so that we can load the correct ATA timings if
 127  *      necessary.  Specifically we have a problem that there is only
 128  *      one MWDMA/UDMA bit.
 129  */
 130
 131 static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc)
 132 {
 133         struct ata_port *ap = qc->ap;
 134         struct ata_device *adev = qc->dev;
 135         struct ata_device *prev = ap->private_data;
 136
 137         /* See if the DMA settings could be wrong */
 138         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
 139                 /* Maybe, but do the channels match MWDMA/UDMA ? */
 140                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
 141                     (ata_using_udma(prev) && !ata_using_udma(adev)))
 142                         /* Switch the mode bits */
 143                         cs5530_set_dmamode(ap, adev);
 144         }
 145
 146         return ata_bmdma_qc_issue(qc);
 147 }
 148
 149 static const struct scsi_host_template cs5530_sht = {
 150         ATA_BASE_SHT(DRV_NAME),
 151         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 152         .dma_boundary   = ATA_DMA_BOUNDARY,
 153 };
 154
 155 static struct ata_port_operations cs5530_port_ops = {
 156         .inherits       = &ata_bmdma_port_ops,
 157
 158         .qc_prep        = ata_bmdma_dumb_qc_prep,
 159         .qc_issue       = cs5530_qc_issue,
 160
 161         .cable_detect   = ata_cable_40wire,
 162         .set_piomode    = cs5530_set_piomode,
 163         .set_dmamode    = cs5530_set_dmamode,
 164 };
 165
 166 static const struct dmi_system_id palmax_dmi_table[] = {
 167         {
 168                 .ident = "Palmax PD1100",
 169                 .matches = {
 170                         DMI_MATCH(DMI_SYS_VENDOR, "Cyrix"),
 171                         DMI_MATCH(DMI_PRODUCT_NAME, "Caddis"),
 172                 },
 173         },
 174         { }
 175 };
 176
 177 static int cs5530_is_palmax(void)
 178 {
 179         if (dmi_check_system(palmax_dmi_table)) {
 180                 printk(KERN_INFO "Palmax PD1100: Disabling DMA on docking port.\n");
 181                 return 1;
 182         }
 183         return 0;
 184 }
 185
 186
 187 /**
 188  *      cs5530_init_chip        -       Chipset init
 189  *
 190  *      Perform the chip initialisation work that is shared between both
 191  *      setup and resume paths
 192  */
 193
 194 static int cs5530_init_chip(void)
 195 {
 196         struct pci_dev *master_0 = NULL, *cs5530_0 = NULL, *dev = NULL;
 197
 198         while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
 199                 switch (dev->device) {
 200                         case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
 201                                 master_0 = pci_dev_get(dev);
 202                                 break;
 203                         case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
 204                                 cs5530_0 = pci_dev_get(dev);
 205                                 break;
 206                 }
 207         }
 208         if (!master_0) {
 209                 printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n");
 210                 goto fail_put;
 211         }
 212         if (!cs5530_0) {
 213                 printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
 214                 goto fail_put;
 215         }
 216
 217         pci_set_master(cs5530_0);
 218         pci_try_set_mwi(cs5530_0);
 219
 220         /*
 221          * Set PCI CacheLineSize to 16-bytes:
 222          * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
 223          *
 224          * Note: This value is constant because the 5530 is only a Geode companion
 225          */
 226
 227         pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
 228
 229         /*
 230          * Disable trapping of UDMA register accesses (Win98 hack):
 231          * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
 232          */
 233
 234         pci_write_config_word(cs5530_0, 0xd0, 0x5006);
 235
 236         /*
 237          * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
 238          * The other settings are what is necessary to get the register
 239          * into a sane state for IDE DMA operation.
 240          */
 241
 242         pci_write_config_byte(master_0, 0x40, 0x1e);
 243
 244         /*
 245          * Set max PCI burst size (16-bytes seems to work best):
 246          *         16bytes: set bit-1 at 0x41 (reg value of 0x16)
 247          *      all others: clear bit-1 at 0x41, and do:
 248          *        128bytes: OR 0x00 at 0x41
 249          *        256bytes: OR 0x04 at 0x41
 250          *        512bytes: OR 0x08 at 0x41
 251          *       1024bytes: OR 0x0c at 0x41
 252          */
 253
 254         pci_write_config_byte(master_0, 0x41, 0x14);
 255
 256         /*
 257          * These settings are necessary to get the chip
 258          * into a sane state for IDE DMA operation.
 259          */
 260
 261         pci_write_config_byte(master_0, 0x42, 0x00);
 262         pci_write_config_byte(master_0, 0x43, 0xc1);
 263
 264         pci_dev_put(master_0);
 265         pci_dev_put(cs5530_0);
 266         return 0;
 267 fail_put:
 268         pci_dev_put(master_0);
 269         pci_dev_put(cs5530_0);
 270         return -ENODEV;
 271 }
 272
 273 /**
 274  *      cs5530_init_one         -       Initialise a CS5530
 275  *      @pdev: PCI device
 276  *      @id: Entry in match table
 277  *
 278  *      Install a driver for the newly found CS5530 companion chip. Most of
 279  *      this is just housekeeping. We have to set the chip up correctly and
 280  *      turn off various bits of emulation magic.
 281  */
 282
 283 static int cs5530_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 284 {
 285         static const struct ata_port_info info = {
 286                 .flags = ATA_FLAG_SLAVE_POSS,
 287                 .pio_mask = ATA_PIO4,
 288                 .mwdma_mask = ATA_MWDMA2,
 289                 .udma_mask = ATA_UDMA2,
 290                 .port_ops = &cs5530_port_ops
 291         };
 292         /* The docking connector doesn't do UDMA, and it seems not MWDMA */
 293         static const struct ata_port_info info_palmax_secondary = {
 294                 .flags = ATA_FLAG_SLAVE_POSS,
 295                 .pio_mask = ATA_PIO4,
 296                 .port_ops = &cs5530_port_ops
 297         };
 298         const struct ata_port_info *ppi[] = { &info, NULL };
 299         int rc;
 300
 301         rc = pcim_enable_device(pdev);
 302         if (rc)
 303                 return rc;
 304
 305         /* Chip initialisation */
 306         if (cs5530_init_chip())
 307                 return -ENODEV;
 308
 309         if (cs5530_is_palmax())
 310                 ppi[1] = &info_palmax_secondary;
 311
 312         /* Now kick off ATA set up */
 313         return ata_pci_bmdma_init_one(pdev, ppi, &cs5530_sht, NULL, 0);
 314 }
 315
 316 #ifdef CONFIG_PM_SLEEP
 317 static int cs5530_reinit_one(struct pci_dev *pdev)
 318 {
 319         struct ata_host *host = pci_get_drvdata(pdev);
 320         int rc;
 321
 322         rc = ata_pci_device_do_resume(pdev);
 323         if (rc)
 324                 return rc;
 325
 326         /* If we fail on resume we are doomed */
 327         if (cs5530_init_chip())
 328                 return -EIO;
 329
 330         ata_host_resume(host);
 331         return 0;
 332 }
 333 #endif /* CONFIG_PM_SLEEP */
 334
 335 static const struct pci_device_id cs5530[] = {
 336         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), },
 337
 338         { },
 339 };
 340
 341 static struct pci_driver cs5530_pci_driver = {
 342         .name           = DRV_NAME,
 343         .id_table       = cs5530,
 344         .probe          = cs5530_init_one,
 345         .remove         = ata_pci_remove_one,
 346 #ifdef CONFIG_PM_SLEEP
 347         .suspend        = ata_pci_device_suspend,
 348         .resume         = cs5530_reinit_one,
 349 #endif
 350 };
 351
 352 module_pci_driver(cs5530_pci_driver);
 353
 354 MODULE_AUTHOR("Alan Cox");
 355 MODULE_DESCRIPTION("low-level driver for the Cyrix/NS/AMD 5530");
 356 MODULE_LICENSE("GPL");
 357 MODULE_DEVICE_TABLE(pci, cs5530);
 358 MODULE_VERSION(DRV_VERSION);