drivers/ata/pata_sc1200.c

   1 /*
   2  * New ATA layer SC1200 driver          Alan Cox <alan@lxorguk.ukuu.org.uk>
   3  *
   4  * TODO: Mode selection filtering
   5  * TODO: Needs custom DMA cleanup code
   6  *
   7  * Based very heavily on
   8  *
   9  * linux/drivers/ide/pci/sc1200.c               Version 0.91    28-Jan-2003
  10  *
  11  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
  12  * May be copied or modified under the terms of the GNU General Public License
  13  *
  14  * Development of this chipset driver was funded
  15  * by the nice folks at National Semiconductor.
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License version 2 as
  19  * published by the Free Software Foundation.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  *
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/pci.h>
  35 #include <linux/init.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/delay.h>
  38 #include <scsi/scsi_host.h>
  39 #include <linux/libata.h>
  40
  41 #define DRV_NAME        "sc1200"
  42 #define DRV_VERSION     "0.2.6"
  43
  44 #define SC1200_REV_A    0x00
  45 #define SC1200_REV_B1   0x01
  46 #define SC1200_REV_B3   0x02
  47 #define SC1200_REV_C1   0x03
  48 #define SC1200_REV_D1   0x04
  49
  50 /**
  51  *      sc1200_clock    -       PCI clock
  52  *
  53  *      Return the PCI bus clocking for the SC1200 chipset configuration
  54  *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
  55  */
  56
  57 static int sc1200_clock(void)
  58 {
  59         /* Magic registers that give us the chipset data */
  60         u8 chip_id = inb(0x903C);
  61         u8 silicon_rev = inb(0x903D);
  62         u16 pci_clock;
  63
  64         if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
  65                 return 0;       /* 33 MHz mode */
  66
  67         /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
  68            0/3 is 33Mhz 1 is 48 2 is 66 */
  69
  70         pci_clock = inw(0x901E);
  71         pci_clock >>= 8;
  72         pci_clock &= 0x03;
  73         if (pci_clock == 3)
  74                 pci_clock = 0;
  75         return pci_clock;
  76 }
  77
  78 /**
  79  *      sc1200_set_piomode              -       PIO setup
  80  *      @ap: ATA interface
  81  *      @adev: device on the interface
  82  *
  83  *      Set our PIO requirements. This is fairly simple on the SC1200
  84  */
  85
  86 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
  87 {
  88         static const u32 pio_timings[4][5] = {
  89                 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},   // format0  33Mhz
  90                 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},   // format1, 33Mhz
  91                 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},   // format1, 48Mhz
  92                 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}    // format1, 66Mhz
  93         };
  94
  95         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  96         u32 format;
  97         unsigned int reg = 0x40 + 0x10 * ap->port_no;
  98         int mode = adev->pio_mode - XFER_PIO_0;
  99
 100         pci_read_config_dword(pdev, reg + 4, &format);
 101         format >>= 31;
 102         format += sc1200_clock();
 103         pci_write_config_dword(pdev, reg + 8 * adev->devno,
 104                                 pio_timings[format][mode]);
 105 }
 106
 107 /**
 108  *      sc1200_set_dmamode              -       DMA timing setup
 109  *      @ap: ATA interface
 110  *      @adev: Device being configured
 111  *
 112  *      We cannot mix MWDMA and UDMA without reloading timings each switch
 113  *      master to slave.
 114  */
 115
 116 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 117 {
 118         static const u32 udma_timing[3][3] = {
 119                 { 0x00921250, 0x00911140, 0x00911030 },
 120                 { 0x00932470, 0x00922260, 0x00922140 },
 121                 { 0x009436A1, 0x00933481, 0x00923261 }
 122         };
 123
 124         static const u32 mwdma_timing[3][3] = {
 125                 { 0x00077771, 0x00012121, 0x00002020 },
 126                 { 0x000BBBB2, 0x00024241, 0x00013131 },
 127                 { 0x000FFFF3, 0x00035352, 0x00015151 }
 128         };
 129
 130         int clock = sc1200_clock();
 131         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 132         unsigned int reg = 0x40 + 0x10 * ap->port_no;
 133         int mode = adev->dma_mode;
 134         u32 format;
 135
 136         if (mode >= XFER_UDMA_0)
 137                 format = udma_timing[clock][mode - XFER_UDMA_0];
 138         else
 139                 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
 140
 141         if (adev->devno == 0) {
 142                 u32 timings;
 143
 144                 pci_read_config_dword(pdev, reg + 4, &timings);
 145                 timings &= 0x80000000UL;
 146                 timings |= format;
 147                 pci_write_config_dword(pdev, reg + 4, timings);
 148         } else
 149                 pci_write_config_dword(pdev, reg + 12, format);
 150 }
 151
 152 /**
 153  *      sc1200_qc_issue         -       command issue
 154  *      @qc: command pending
 155  *
 156  *      Called when the libata layer is about to issue a command. We wrap
 157  *      this interface so that we can load the correct ATA timings if
 158  *      necessary.  Specifically we have a problem that there is only
 159  *      one MWDMA/UDMA bit.
 160  */
 161
 162 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
 163 {
 164         struct ata_port *ap = qc->ap;
 165         struct ata_device *adev = qc->dev;
 166         struct ata_device *prev = ap->private_data;
 167
 168         /* See if the DMA settings could be wrong */
 169         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
 170                 /* Maybe, but do the channels match MWDMA/UDMA ? */
 171                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
 172                     (ata_using_udma(prev) && !ata_using_udma(adev)))
 173                         /* Switch the mode bits */
 174                         sc1200_set_dmamode(ap, adev);
 175         }
 176
 177         return ata_bmdma_qc_issue(qc);
 178 }
 179
 180 /**
 181  *      sc1200_qc_defer -       implement serialization
 182  *      @qc: command
 183  *
 184  *      Serialize command issue on this controller.
 185  */
 186
 187 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
 188 {
 189         struct ata_host *host = qc->ap->host;
 190         struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
 191         int rc;
 192
 193         /* First apply the usual rules */
 194         rc = ata_std_qc_defer(qc);
 195         if (rc != 0)
 196                 return rc;
 197
 198         /* Now apply serialization rules. Only allow a command if the
 199            other channel state machine is idle */
 200         if (alt && alt->qc_active)
 201                 return  ATA_DEFER_PORT;
 202         return 0;
 203 }
 204
 205 static struct scsi_host_template sc1200_sht = {
 206         ATA_BMDMA_SHT(DRV_NAME),
 207         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 208 };
 209
 210 static struct ata_port_operations sc1200_port_ops = {
 211         .inherits       = &ata_bmdma_port_ops,
 212         .qc_prep        = ata_bmdma_dumb_qc_prep,
 213         .qc_issue       = sc1200_qc_issue,
 214         .qc_defer       = sc1200_qc_defer,
 215         .cable_detect   = ata_cable_40wire,
 216         .set_piomode    = sc1200_set_piomode,
 217         .set_dmamode    = sc1200_set_dmamode,
 218 };
 219
 220 /**
 221  *      sc1200_init_one         -       Initialise an SC1200
 222  *      @dev: PCI device
 223  *      @id: Entry in match table
 224  *
 225  *      Just throw the needed data at the libata helper and it does all
 226  *      our work.
 227  */
 228
 229 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 230 {
 231         static const struct ata_port_info info = {
 232                 .flags = ATA_FLAG_SLAVE_POSS,
 233                 .pio_mask = ATA_PIO4,
 234                 .mwdma_mask = ATA_MWDMA2,
 235                 .udma_mask = ATA_UDMA2,
 236                 .port_ops = &sc1200_port_ops
 237         };
 238         const struct ata_port_info *ppi[] = { &info, NULL };
 239
 240         return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
 241 }
 242
 243 static const struct pci_device_id sc1200[] = {
 244         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 245
 246         { },
 247 };
 248
 249 static struct pci_driver sc1200_pci_driver = {
 250         .name           = DRV_NAME,
 251         .id_table       = sc1200,
 252         .probe          = sc1200_init_one,
 253         .remove         = ata_pci_remove_one,
 254 #ifdef CONFIG_PM
 255         .suspend        = ata_pci_device_suspend,
 256         .resume         = ata_pci_device_resume,
 257 #endif
 258 };
 259
 260 static int __init sc1200_init(void)
 261 {
 262         return pci_register_driver(&sc1200_pci_driver);
 263 }
 264
 265 static void __exit sc1200_exit(void)
 266 {
 267         pci_unregister_driver(&sc1200_pci_driver);
 268 }
 269
 270 MODULE_AUTHOR("Alan Cox, Mark Lord");
 271 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 272 MODULE_LICENSE("GPL");
 273 MODULE_DEVICE_TABLE(pci, sc1200);
 274 MODULE_VERSION(DRV_VERSION);
 275
 276 module_init(sc1200_init);
 277 module_exit(sc1200_exit);