drivers/ata/pata_sc1200.c

   1 /*
   2  * New ATA layer SC1200 driver          Alan Cox <alan@redhat.com>
   3  *
   4  * TODO: Mode selection filtering
   5  * TODO: Can't enable second channel until ATA core has serialize
   6  * TODO: Needs custom DMA cleanup code
   7  *
   8  * Based very heavily on
   9  *
  10  * linux/drivers/ide/pci/sc1200.c               Version 0.91    28-Jan-2003
  11  *
  12  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
  13  * May be copied or modified under the terms of the GNU General Public License
  14  *
  15  * Development of this chipset driver was funded
  16  * by the nice folks at National Semiconductor.
  17  *
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License version 2 as
  20  * published by the Free Software Foundation.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  30  *
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/pci.h>
  36 #include <linux/init.h>
  37 #include <linux/blkdev.h>
  38 #include <linux/delay.h>
  39 #include <scsi/scsi_host.h>
  40 #include <linux/libata.h>
  41
  42 #define DRV_NAME        "sc1200"
  43 #define DRV_VERSION     "0.2.6"
  44
  45 #define SC1200_REV_A    0x00
  46 #define SC1200_REV_B1   0x01
  47 #define SC1200_REV_B3   0x02
  48 #define SC1200_REV_C1   0x03
  49 #define SC1200_REV_D1   0x04
  50
  51 /**
  52  *      sc1200_clock    -       PCI clock
  53  *
  54  *      Return the PCI bus clocking for the SC1200 chipset configuration
  55  *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
  56  */
  57
  58 static int sc1200_clock(void)
  59 {
  60         /* Magic registers that give us the chipset data */
  61         u8 chip_id = inb(0x903C);
  62         u8 silicon_rev = inb(0x903D);
  63         u16 pci_clock;
  64
  65         if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
  66                 return 0;       /* 33 MHz mode */
  67
  68         /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
  69            0/3 is 33Mhz 1 is 48 2 is 66 */
  70
  71         pci_clock = inw(0x901E);
  72         pci_clock >>= 8;
  73         pci_clock &= 0x03;
  74         if (pci_clock == 3)
  75                 pci_clock = 0;
  76         return pci_clock;
  77 }
  78
  79 /**
  80  *      sc1200_set_piomode              -       PIO setup
  81  *      @ap: ATA interface
  82  *      @adev: device on the interface
  83  *
  84  *      Set our PIO requirements. This is fairly simple on the SC1200
  85  */
  86
  87 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
  88 {
  89         static const u32 pio_timings[4][5] = {
  90                 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},   // format0  33Mhz
  91                 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010},   // format1, 33Mhz
  92                 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021},   // format1, 48Mhz
  93                 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131}    // format1, 66Mhz
  94         };
  95
  96         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  97         u32 format;
  98         unsigned int reg = 0x40 + 0x10 * ap->port_no;
  99         int mode = adev->pio_mode - XFER_PIO_0;
 100
 101         pci_read_config_dword(pdev, reg + 4, &format);
 102         format >>= 31;
 103         format += sc1200_clock();
 104         pci_write_config_dword(pdev, reg + 8 * adev->devno,
 105                                 pio_timings[format][mode]);
 106 }
 107
 108 /**
 109  *      sc1200_set_dmamode              -       DMA timing setup
 110  *      @ap: ATA interface
 111  *      @adev: Device being configured
 112  *
 113  *      We cannot mix MWDMA and UDMA without reloading timings each switch
 114  *      master to slave.
 115  */
 116
 117 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 118 {
 119         static const u32 udma_timing[3][3] = {
 120                 { 0x00921250, 0x00911140, 0x00911030 },
 121                 { 0x00932470, 0x00922260, 0x00922140 },
 122                 { 0x009436A1, 0x00933481, 0x00923261 }
 123         };
 124
 125         static const u32 mwdma_timing[3][3] = {
 126                 { 0x00077771, 0x00012121, 0x00002020 },
 127                 { 0x000BBBB2, 0x00024241, 0x00013131 },
 128                 { 0x000FFFF3, 0x00035352, 0x00015151 }
 129         };
 130
 131         int clock = sc1200_clock();
 132         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 133         unsigned int reg = 0x40 + 0x10 * ap->port_no;
 134         int mode = adev->dma_mode;
 135         u32 format;
 136
 137         if (mode >= XFER_UDMA_0)
 138                 format = udma_timing[clock][mode - XFER_UDMA_0];
 139         else
 140                 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
 141
 142         if (adev->devno == 0) {
 143                 u32 timings;
 144
 145                 pci_read_config_dword(pdev, reg + 4, &timings);
 146                 timings &= 0x80000000UL;
 147                 timings |= format;
 148                 pci_write_config_dword(pdev, reg + 4, timings);
 149         } else
 150                 pci_write_config_dword(pdev, reg + 12, format);
 151 }
 152
 153 /**
 154  *      sc1200_qc_issue         -       command issue
 155  *      @qc: command pending
 156  *
 157  *      Called when the libata layer is about to issue a command. We wrap
 158  *      this interface so that we can load the correct ATA timings if
 159  *      necessary.  Specifically we have a problem that there is only
 160  *      one MWDMA/UDMA bit.
 161  */
 162
 163 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
 164 {
 165         struct ata_port *ap = qc->ap;
 166         struct ata_device *adev = qc->dev;
 167         struct ata_device *prev = ap->private_data;
 168
 169         /* See if the DMA settings could be wrong */
 170         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
 171                 /* Maybe, but do the channels match MWDMA/UDMA ? */
 172                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
 173                     (ata_using_udma(prev) && !ata_using_udma(adev)))
 174                         /* Switch the mode bits */
 175                         sc1200_set_dmamode(ap, adev);
 176         }
 177
 178         return ata_sff_qc_issue(qc);
 179 }
 180
 181 static struct scsi_host_template sc1200_sht = {
 182         ATA_BMDMA_SHT(DRV_NAME),
 183         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 184 };
 185
 186 static struct ata_port_operations sc1200_port_ops = {
 187         .inherits       = &ata_bmdma_port_ops,
 188         .qc_prep        = ata_sff_dumb_qc_prep,
 189         .qc_issue       = sc1200_qc_issue,
 190         .cable_detect   = ata_cable_40wire,
 191         .set_piomode    = sc1200_set_piomode,
 192         .set_dmamode    = sc1200_set_dmamode,
 193 };
 194
 195 /**
 196  *      sc1200_init_one         -       Initialise an SC1200
 197  *      @dev: PCI device
 198  *      @id: Entry in match table
 199  *
 200  *      Just throw the needed data at the libata helper and it does all
 201  *      our work.
 202  */
 203
 204 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 205 {
 206         static const struct ata_port_info info = {
 207                 .flags = ATA_FLAG_SLAVE_POSS,
 208                 .pio_mask = 0x1f,
 209                 .mwdma_mask = 0x07,
 210                 .udma_mask = 0x07,
 211                 .port_ops = &sc1200_port_ops
 212         };
 213         /* Can't enable port 2 yet, see top comments */
 214         const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
 215
 216         return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL);
 217 }
 218
 219 static const struct pci_device_id sc1200[] = {
 220         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 221
 222         { },
 223 };
 224
 225 static struct pci_driver sc1200_pci_driver = {
 226         .name           = DRV_NAME,
 227         .id_table       = sc1200,
 228         .probe          = sc1200_init_one,
 229         .remove         = ata_pci_remove_one,
 230 #ifdef CONFIG_PM
 231         .suspend        = ata_pci_device_suspend,
 232         .resume         = ata_pci_device_resume,
 233 #endif
 234 };
 235
 236 static int __init sc1200_init(void)
 237 {
 238         return pci_register_driver(&sc1200_pci_driver);
 239 }
 240
 241 static void __exit sc1200_exit(void)
 242 {
 243         pci_unregister_driver(&sc1200_pci_driver);
 244 }
 245
 246 MODULE_AUTHOR("Alan Cox, Mark Lord");
 247 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 248 MODULE_LICENSE("GPL");
 249 MODULE_DEVICE_TABLE(pci, sc1200);
 250 MODULE_VERSION(DRV_VERSION);
 251
 252 module_init(sc1200_init);
 253 module_exit(sc1200_exit);