drivers/ata/pata_rdc.c

   1 /*
   2  *  pata_rdc            -       Driver for later RDC PATA controllers
   3  *
   4  *  This is actually a driver for hardware meeting
   5  *  INCITS 370-2004 (1510D): ATA Host Adapter Standards
   6  *
   7  *  Based on ata_piix.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2, or (at your option)
  12  *  any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; see the file COPYING.  If not, write to
  21  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/pci.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/delay.h>
  30 #include <linux/device.h>
  31 #include <linux/gfp.h>
  32 #include <scsi/scsi_host.h>
  33 #include <linux/libata.h>
  34 #include <linux/dmi.h>
  35
  36 #define DRV_NAME        "pata_rdc"
  37 #define DRV_VERSION     "0.01"
  38
  39 struct rdc_host_priv {
  40         u32 saved_iocfg;
  41 };
  42
  43 /**
  44  *      rdc_pata_cable_detect - Probe host controller cable detect info
  45  *      @ap: Port for which cable detect info is desired
  46  *
  47  *      Read 80c cable indicator from ATA PCI device's PCI config
  48  *      register.  This register is normally set by firmware (BIOS).
  49  *
  50  *      LOCKING:
  51  *      None (inherited from caller).
  52  */
  53
  54 static int rdc_pata_cable_detect(struct ata_port *ap)
  55 {
  56         struct rdc_host_priv *hpriv = ap->host->private_data;
  57         u8 mask;
  58
  59         /* check BIOS cable detect results */
  60         mask = 0x30 << (2 * ap->port_no);
  61         if ((hpriv->saved_iocfg & mask) == 0)
  62                 return ATA_CBL_PATA40;
  63         return ATA_CBL_PATA80;
  64 }
  65
  66 /**
  67  *      rdc_pata_prereset - prereset for PATA host controller
  68  *      @link: Target link
  69  *      @deadline: deadline jiffies for the operation
  70  *
  71  *      LOCKING:
  72  *      None (inherited from caller).
  73  */
  74 static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
  75 {
  76         struct ata_port *ap = link->ap;
  77         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  78
  79         static const struct pci_bits rdc_enable_bits[] = {
  80                 { 0x41U, 1U, 0x80UL, 0x80UL },  /* port 0 */
  81                 { 0x43U, 1U, 0x80UL, 0x80UL },  /* port 1 */
  82         };
  83
  84         if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no]))
  85                 return -ENOENT;
  86         return ata_sff_prereset(link, deadline);
  87 }
  88
  89 /**
  90  *      rdc_set_piomode - Initialize host controller PATA PIO timings
  91  *      @ap: Port whose timings we are configuring
  92  *      @adev: um
  93  *
  94  *      Set PIO mode for device, in host controller PCI config space.
  95  *
  96  *      LOCKING:
  97  *      None (inherited from caller).
  98  */
  99
 100 static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
 101 {
 102         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
 103         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 104         unsigned int is_slave   = (adev->devno != 0);
 105         unsigned int master_port= ap->port_no ? 0x42 : 0x40;
 106         unsigned int slave_port = 0x44;
 107         u16 master_data;
 108         u8 slave_data;
 109         u8 udma_enable;
 110         int control = 0;
 111
 112         static const     /* ISP  RTC */
 113         u8 timings[][2] = { { 0, 0 },
 114                             { 0, 0 },
 115                             { 1, 0 },
 116                             { 2, 1 },
 117                             { 2, 3 }, };
 118
 119         if (pio >= 2)
 120                 control |= 1;   /* TIME1 enable */
 121         if (ata_pio_need_iordy(adev))
 122                 control |= 2;   /* IE enable */
 123
 124         if (adev->class == ATA_DEV_ATA)
 125                 control |= 4;   /* PPE enable */
 126
 127         /* PIO configuration clears DTE unconditionally.  It will be
 128          * programmed in set_dmamode which is guaranteed to be called
 129          * after set_piomode if any DMA mode is available.
 130          */
 131         pci_read_config_word(dev, master_port, &master_data);
 132         if (is_slave) {
 133                 /* clear TIME1|IE1|PPE1|DTE1 */
 134                 master_data &= 0xff0f;
 135                 /* Enable SITRE (separate slave timing register) */
 136                 master_data |= 0x4000;
 137                 /* enable PPE1, IE1 and TIME1 as needed */
 138                 master_data |= (control << 4);
 139                 pci_read_config_byte(dev, slave_port, &slave_data);
 140                 slave_data &= (ap->port_no ? 0x0f : 0xf0);
 141                 /* Load the timing nibble for this slave */
 142                 slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
 143                                                 << (ap->port_no ? 4 : 0);
 144         } else {
 145                 /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
 146                 master_data &= 0xccf0;
 147                 /* Enable PPE, IE and TIME as appropriate */
 148                 master_data |= control;
 149                 /* load ISP and RCT */
 150                 master_data |=
 151                         (timings[pio][0] << 12) |
 152                         (timings[pio][1] << 8);
 153         }
 154         pci_write_config_word(dev, master_port, master_data);
 155         if (is_slave)
 156                 pci_write_config_byte(dev, slave_port, slave_data);
 157
 158         /* Ensure the UDMA bit is off - it will be turned back on if
 159            UDMA is selected */
 160
 161         pci_read_config_byte(dev, 0x48, &udma_enable);
 162         udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
 163         pci_write_config_byte(dev, 0x48, udma_enable);
 164 }
 165
 166 /**
 167  *      rdc_set_dmamode - Initialize host controller PATA PIO timings
 168  *      @ap: Port whose timings we are configuring
 169  *      @adev: Drive in question
 170  *
 171  *      Set UDMA mode for device, in host controller PCI config space.
 172  *
 173  *      LOCKING:
 174  *      None (inherited from caller).
 175  */
 176
 177 static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 178 {
 179         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 180         u8 master_port          = ap->port_no ? 0x42 : 0x40;
 181         u16 master_data;
 182         u8 speed                = adev->dma_mode;
 183         int devid               = adev->devno + 2 * ap->port_no;
 184         u8 udma_enable          = 0;
 185
 186         static const     /* ISP  RTC */
 187         u8 timings[][2] = { { 0, 0 },
 188                             { 0, 0 },
 189                             { 1, 0 },
 190                             { 2, 1 },
 191                             { 2, 3 }, };
 192
 193         pci_read_config_word(dev, master_port, &master_data);
 194         pci_read_config_byte(dev, 0x48, &udma_enable);
 195
 196         if (speed >= XFER_UDMA_0) {
 197                 unsigned int udma = adev->dma_mode - XFER_UDMA_0;
 198                 u16 udma_timing;
 199                 u16 ideconf;
 200                 int u_clock, u_speed;
 201
 202                 /*
 203                  * UDMA is handled by a combination of clock switching and
 204                  * selection of dividers
 205                  *
 206                  * Handy rule: Odd modes are UDMATIMx 01, even are 02
 207                  *             except UDMA0 which is 00
 208                  */
 209                 u_speed = min(2 - (udma & 1), udma);
 210                 if (udma == 5)
 211                         u_clock = 0x1000;       /* 100Mhz */
 212                 else if (udma > 2)
 213                         u_clock = 1;            /* 66Mhz */
 214                 else
 215                         u_clock = 0;            /* 33Mhz */
 216
 217                 udma_enable |= (1 << devid);
 218
 219                 /* Load the CT/RP selection */
 220                 pci_read_config_word(dev, 0x4A, &udma_timing);
 221                 udma_timing &= ~(3 << (4 * devid));
 222                 udma_timing |= u_speed << (4 * devid);
 223                 pci_write_config_word(dev, 0x4A, udma_timing);
 224
 225                 /* Select a 33/66/100Mhz clock */
 226                 pci_read_config_word(dev, 0x54, &ideconf);
 227                 ideconf &= ~(0x1001 << devid);
 228                 ideconf |= u_clock << devid;
 229                 pci_write_config_word(dev, 0x54, ideconf);
 230         } else {
 231                 /*
 232                  * MWDMA is driven by the PIO timings. We must also enable
 233                  * IORDY unconditionally along with TIME1. PPE has already
 234                  * been set when the PIO timing was set.
 235                  */
 236                 unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 237                 unsigned int control;
 238                 u8 slave_data;
 239                 const unsigned int needed_pio[3] = {
 240                         XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 241                 };
 242                 int pio = needed_pio[mwdma] - XFER_PIO_0;
 243
 244                 control = 3;    /* IORDY|TIME1 */
 245
 246                 /* If the drive MWDMA is faster than it can do PIO then
 247                    we must force PIO into PIO0 */
 248
 249                 if (adev->pio_mode < needed_pio[mwdma])
 250                         /* Enable DMA timing only */
 251                         control |= 8;   /* PIO cycles in PIO0 */
 252
 253                 if (adev->devno) {      /* Slave */
 254                         master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
 255                         master_data |= control << 4;
 256                         pci_read_config_byte(dev, 0x44, &slave_data);
 257                         slave_data &= (ap->port_no ? 0x0f : 0xf0);
 258                         /* Load the matching timing */
 259                         slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
 260                         pci_write_config_byte(dev, 0x44, slave_data);
 261                 } else {        /* Master */
 262                         master_data &= 0xCCF4;  /* Mask out IORDY|TIME1|DMAONLY
 263                                                    and master timing bits */
 264                         master_data |= control;
 265                         master_data |=
 266                                 (timings[pio][0] << 12) |
 267                                 (timings[pio][1] << 8);
 268                 }
 269
 270                 udma_enable &= ~(1 << devid);
 271                 pci_write_config_word(dev, master_port, master_data);
 272         }
 273         pci_write_config_byte(dev, 0x48, udma_enable);
 274 }
 275
 276 static struct ata_port_operations rdc_pata_ops = {
 277         .inherits               = &ata_bmdma32_port_ops,
 278         .cable_detect           = rdc_pata_cable_detect,
 279         .set_piomode            = rdc_set_piomode,
 280         .set_dmamode            = rdc_set_dmamode,
 281         .prereset               = rdc_pata_prereset,
 282 };
 283
 284 static struct ata_port_info rdc_port_info = {
 285
 286         .flags          = ATA_FLAG_SLAVE_POSS,
 287         .pio_mask       = ATA_PIO4,
 288         .mwdma_mask     = ATA_MWDMA12_ONLY,
 289         .udma_mask      = ATA_UDMA5,
 290         .port_ops       = &rdc_pata_ops,
 291 };
 292
 293 static struct scsi_host_template rdc_sht = {
 294         ATA_BMDMA_SHT(DRV_NAME),
 295 };
 296
 297 /**
 298  *      rdc_init_one - Register PIIX ATA PCI device with kernel services
 299  *      @pdev: PCI device to register
 300  *      @ent: Entry in rdc_pci_tbl matching with @pdev
 301  *
 302  *      Called from kernel PCI layer.  We probe for combined mode (sigh),
 303  *      and then hand over control to libata, for it to do the rest.
 304  *
 305  *      LOCKING:
 306  *      Inherited from PCI layer (may sleep).
 307  *
 308  *      RETURNS:
 309  *      Zero on success, or -ERRNO value.
 310  */
 311
 312 static int __devinit rdc_init_one(struct pci_dev *pdev,
 313                                    const struct pci_device_id *ent)
 314 {
 315         struct device *dev = &pdev->dev;
 316         struct ata_port_info port_info[2];
 317         const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
 318         unsigned long port_flags;
 319         struct ata_host *host;
 320         struct rdc_host_priv *hpriv;
 321         int rc;
 322
 323         ata_print_version_once(&pdev->dev, DRV_VERSION);
 324
 325         port_info[0] = rdc_port_info;
 326         port_info[1] = rdc_port_info;
 327
 328         port_flags = port_info[0].flags;
 329
 330         /* enable device and prepare host */
 331         rc = pcim_enable_device(pdev);
 332         if (rc)
 333                 return rc;
 334
 335         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 336         if (!hpriv)
 337                 return -ENOMEM;
 338
 339         /* Save IOCFG, this will be used for cable detection, quirk
 340          * detection and restoration on detach.
 341          */
 342         pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);
 343
 344         rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
 345         if (rc)
 346                 return rc;
 347         host->private_data = hpriv;
 348
 349         pci_intx(pdev, 1);
 350
 351         host->flags |= ATA_HOST_PARALLEL_SCAN;
 352
 353         pci_set_master(pdev);
 354         return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht);
 355 }
 356
 357 static void rdc_remove_one(struct pci_dev *pdev)
 358 {
 359         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 360         struct rdc_host_priv *hpriv = host->private_data;
 361
 362         pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);
 363
 364         ata_pci_remove_one(pdev);
 365 }
 366
 367 static const struct pci_device_id rdc_pci_tbl[] = {
 368         { PCI_DEVICE(0x17F3, 0x1011), },
 369         { PCI_DEVICE(0x17F3, 0x1012), },
 370         { }     /* terminate list */
 371 };
 372
 373 static struct pci_driver rdc_pci_driver = {
 374         .name                   = DRV_NAME,
 375         .id_table               = rdc_pci_tbl,
 376         .probe                  = rdc_init_one,
 377         .remove                 = rdc_remove_one,
 378 };
 379
 380
 381 static int __init rdc_init(void)
 382 {
 383         return pci_register_driver(&rdc_pci_driver);
 384 }
 385
 386 static void __exit rdc_exit(void)
 387 {
 388         pci_unregister_driver(&rdc_pci_driver);
 389 }
 390
 391 module_init(rdc_init);
 392 module_exit(rdc_exit);
 393
 394 MODULE_AUTHOR("Alan Cox (based on ata_piix)");
 395 MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");
 396 MODULE_LICENSE("GPL");
 397 MODULE_DEVICE_TABLE(pci, rdc_pci_tbl);
 398 MODULE_VERSION(DRV_VERSION);