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        "pata_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                 /* format0, 33Mhz */
  90                 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
  91                 /* format1, 33Mhz */
  92                 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
  93                 /* format1, 48Mhz */
  94                 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
  95                 /* format1, 66Mhz */
  96                 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
  97         };
  98
  99         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 100         u32 format;
 101         unsigned int reg = 0x40 + 0x10 * ap->port_no;
 102         int mode = adev->pio_mode - XFER_PIO_0;
 103
 104         pci_read_config_dword(pdev, reg + 4, &format);
 105         format >>= 31;
 106         format += sc1200_clock();
 107         pci_write_config_dword(pdev, reg + 8 * adev->devno,
 108                                 pio_timings[format][mode]);
 109 }
 110
 111 /**
 112  *      sc1200_set_dmamode              -       DMA timing setup
 113  *      @ap: ATA interface
 114  *      @adev: Device being configured
 115  *
 116  *      We cannot mix MWDMA and UDMA without reloading timings each switch
 117  *      master to slave.
 118  */
 119
 120 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 121 {
 122         static const u32 udma_timing[3][3] = {
 123                 { 0x00921250, 0x00911140, 0x00911030 },
 124                 { 0x00932470, 0x00922260, 0x00922140 },
 125                 { 0x009436A1, 0x00933481, 0x00923261 }
 126         };
 127
 128         static const u32 mwdma_timing[3][3] = {
 129                 { 0x00077771, 0x00012121, 0x00002020 },
 130                 { 0x000BBBB2, 0x00024241, 0x00013131 },
 131                 { 0x000FFFF3, 0x00035352, 0x00015151 }
 132         };
 133
 134         int clock = sc1200_clock();
 135         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 136         unsigned int reg = 0x40 + 0x10 * ap->port_no;
 137         int mode = adev->dma_mode;
 138         u32 format;
 139
 140         if (mode >= XFER_UDMA_0)
 141                 format = udma_timing[clock][mode - XFER_UDMA_0];
 142         else
 143                 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
 144
 145         if (adev->devno == 0) {
 146                 u32 timings;
 147
 148                 pci_read_config_dword(pdev, reg + 4, &timings);
 149                 timings &= 0x80000000UL;
 150                 timings |= format;
 151                 pci_write_config_dword(pdev, reg + 4, timings);
 152         } else
 153                 pci_write_config_dword(pdev, reg + 12, format);
 154 }
 155
 156 /**
 157  *      sc1200_qc_issue         -       command issue
 158  *      @qc: command pending
 159  *
 160  *      Called when the libata layer is about to issue a command. We wrap
 161  *      this interface so that we can load the correct ATA timings if
 162  *      necessary.  Specifically we have a problem that there is only
 163  *      one MWDMA/UDMA bit.
 164  */
 165
 166 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
 167 {
 168         struct ata_port *ap = qc->ap;
 169         struct ata_device *adev = qc->dev;
 170         struct ata_device *prev = ap->private_data;
 171
 172         /* See if the DMA settings could be wrong */
 173         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
 174                 /* Maybe, but do the channels match MWDMA/UDMA ? */
 175                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
 176                     (ata_using_udma(prev) && !ata_using_udma(adev)))
 177                         /* Switch the mode bits */
 178                         sc1200_set_dmamode(ap, adev);
 179         }
 180
 181         return ata_bmdma_qc_issue(qc);
 182 }
 183
 184 /**
 185  *      sc1200_qc_defer -       implement serialization
 186  *      @qc: command
 187  *
 188  *      Serialize command issue on this controller.
 189  */
 190
 191 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
 192 {
 193         struct ata_host *host = qc->ap->host;
 194         struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
 195         int rc;
 196
 197         /* First apply the usual rules */
 198         rc = ata_std_qc_defer(qc);
 199         if (rc != 0)
 200                 return rc;
 201
 202         /* Now apply serialization rules. Only allow a command if the
 203            other channel state machine is idle */
 204         if (alt && alt->qc_active)
 205                 return  ATA_DEFER_PORT;
 206         return 0;
 207 }
 208
 209 static struct scsi_host_template sc1200_sht = {
 210         ATA_BMDMA_SHT(DRV_NAME),
 211         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 212 };
 213
 214 static struct ata_port_operations sc1200_port_ops = {
 215         .inherits       = &ata_bmdma_port_ops,
 216         .qc_prep        = ata_bmdma_dumb_qc_prep,
 217         .qc_issue       = sc1200_qc_issue,
 218         .qc_defer       = sc1200_qc_defer,
 219         .cable_detect   = ata_cable_40wire,
 220         .set_piomode    = sc1200_set_piomode,
 221         .set_dmamode    = sc1200_set_dmamode,
 222 };
 223
 224 /**
 225  *      sc1200_init_one         -       Initialise an SC1200
 226  *      @dev: PCI device
 227  *      @id: Entry in match table
 228  *
 229  *      Just throw the needed data at the libata helper and it does all
 230  *      our work.
 231  */
 232
 233 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 234 {
 235         static const struct ata_port_info info = {
 236                 .flags = ATA_FLAG_SLAVE_POSS,
 237                 .pio_mask = ATA_PIO4,
 238                 .mwdma_mask = ATA_MWDMA2,
 239                 .udma_mask = ATA_UDMA2,
 240                 .port_ops = &sc1200_port_ops
 241         };
 242         const struct ata_port_info *ppi[] = { &info, NULL };
 243
 244         return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
 245 }
 246
 247 static const struct pci_device_id sc1200[] = {
 248         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 249
 250         { },
 251 };
 252
 253 static struct pci_driver sc1200_pci_driver = {
 254         .name           = DRV_NAME,
 255         .id_table       = sc1200,
 256         .probe          = sc1200_init_one,
 257         .remove         = ata_pci_remove_one,
 258 #ifdef CONFIG_PM
 259         .suspend        = ata_pci_device_suspend,
 260         .resume         = ata_pci_device_resume,
 261 #endif
 262 };
 263
 264 static int __init sc1200_init(void)
 265 {
 266         return pci_register_driver(&sc1200_pci_driver);
 267 }
 268
 269 static void __exit sc1200_exit(void)
 270 {
 271         pci_unregister_driver(&sc1200_pci_driver);
 272 }
 273
 274 MODULE_AUTHOR("Alan Cox, Mark Lord");
 275 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 276 MODULE_LICENSE("GPL");
 277 MODULE_DEVICE_TABLE(pci, sc1200);
 278 MODULE_VERSION(DRV_VERSION);
 279
 280 module_init(sc1200_init);
 281 module_exit(sc1200_exit);