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/blkdev.h>
  36 #include <linux/delay.h>
  37 #include <scsi/scsi_host.h>
  38 #include <linux/libata.h>
  39
  40 #define DRV_NAME        "pata_sc1200"
  41 #define DRV_VERSION     "0.2.6"
  42
  43 #define SC1200_REV_A    0x00
  44 #define SC1200_REV_B1   0x01
  45 #define SC1200_REV_B3   0x02
  46 #define SC1200_REV_C1   0x03
  47 #define SC1200_REV_D1   0x04
  48
  49 /**
  50  *      sc1200_clock    -       PCI clock
  51  *
  52  *      Return the PCI bus clocking for the SC1200 chipset configuration
  53  *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
  54  */
  55
  56 static int sc1200_clock(void)
  57 {
  58         /* Magic registers that give us the chipset data */
  59         u8 chip_id = inb(0x903C);
  60         u8 silicon_rev = inb(0x903D);
  61         u16 pci_clock;
  62
  63         if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
  64                 return 0;       /* 33 MHz mode */
  65
  66         /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
  67            0/3 is 33Mhz 1 is 48 2 is 66 */
  68
  69         pci_clock = inw(0x901E);
  70         pci_clock >>= 8;
  71         pci_clock &= 0x03;
  72         if (pci_clock == 3)
  73                 pci_clock = 0;
  74         return pci_clock;
  75 }
  76
  77 /**
  78  *      sc1200_set_piomode              -       PIO setup
  79  *      @ap: ATA interface
  80  *      @adev: device on the interface
  81  *
  82  *      Set our PIO requirements. This is fairly simple on the SC1200
  83  */
  84
  85 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
  86 {
  87         static const u32 pio_timings[4][5] = {
  88                 /* format0, 33Mhz */
  89                 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
  90                 /* format1, 33Mhz */
  91                 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
  92                 /* format1, 48Mhz */
  93                 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
  94                 /* format1, 66Mhz */
  95                 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
  96         };
  97
  98         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  99         u32 format;
 100         unsigned int reg = 0x40 + 0x10 * ap->port_no;
 101         int mode = adev->pio_mode - XFER_PIO_0;
 102
 103         pci_read_config_dword(pdev, reg + 4, &format);
 104         format >>= 31;
 105         format += sc1200_clock();
 106         pci_write_config_dword(pdev, reg + 8 * adev->devno,
 107                                 pio_timings[format][mode]);
 108 }
 109
 110 /**
 111  *      sc1200_set_dmamode              -       DMA timing setup
 112  *      @ap: ATA interface
 113  *      @adev: Device being configured
 114  *
 115  *      We cannot mix MWDMA and UDMA without reloading timings each switch
 116  *      master to slave.
 117  */
 118
 119 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 120 {
 121         static const u32 udma_timing[3][3] = {
 122                 { 0x00921250, 0x00911140, 0x00911030 },
 123                 { 0x00932470, 0x00922260, 0x00922140 },
 124                 { 0x009436A1, 0x00933481, 0x00923261 }
 125         };
 126
 127         static const u32 mwdma_timing[3][3] = {
 128                 { 0x00077771, 0x00012121, 0x00002020 },
 129                 { 0x000BBBB2, 0x00024241, 0x00013131 },
 130                 { 0x000FFFF3, 0x00035352, 0x00015151 }
 131         };
 132
 133         int clock = sc1200_clock();
 134         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 135         unsigned int reg = 0x40 + 0x10 * ap->port_no;
 136         int mode = adev->dma_mode;
 137         u32 format;
 138
 139         if (mode >= XFER_UDMA_0)
 140                 format = udma_timing[clock][mode - XFER_UDMA_0];
 141         else
 142                 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
 143
 144         if (adev->devno == 0) {
 145                 u32 timings;
 146
 147                 pci_read_config_dword(pdev, reg + 4, &timings);
 148                 timings &= 0x80000000UL;
 149                 timings |= format;
 150                 pci_write_config_dword(pdev, reg + 4, timings);
 151         } else
 152                 pci_write_config_dword(pdev, reg + 12, format);
 153 }
 154
 155 /**
 156  *      sc1200_qc_issue         -       command issue
 157  *      @qc: command pending
 158  *
 159  *      Called when the libata layer is about to issue a command. We wrap
 160  *      this interface so that we can load the correct ATA timings if
 161  *      necessary.  Specifically we have a problem that there is only
 162  *      one MWDMA/UDMA bit.
 163  */
 164
 165 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
 166 {
 167         struct ata_port *ap = qc->ap;
 168         struct ata_device *adev = qc->dev;
 169         struct ata_device *prev = ap->private_data;
 170
 171         /* See if the DMA settings could be wrong */
 172         if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
 173                 /* Maybe, but do the channels match MWDMA/UDMA ? */
 174                 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
 175                     (ata_using_udma(prev) && !ata_using_udma(adev)))
 176                         /* Switch the mode bits */
 177                         sc1200_set_dmamode(ap, adev);
 178         }
 179
 180         return ata_bmdma_qc_issue(qc);
 181 }
 182
 183 /**
 184  *      sc1200_qc_defer -       implement serialization
 185  *      @qc: command
 186  *
 187  *      Serialize command issue on this controller.
 188  */
 189
 190 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
 191 {
 192         struct ata_host *host = qc->ap->host;
 193         struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
 194         int rc;
 195
 196         /* First apply the usual rules */
 197         rc = ata_std_qc_defer(qc);
 198         if (rc != 0)
 199                 return rc;
 200
 201         /* Now apply serialization rules. Only allow a command if the
 202            other channel state machine is idle */
 203         if (alt && alt->qc_active)
 204                 return  ATA_DEFER_PORT;
 205         return 0;
 206 }
 207
 208 static struct scsi_host_template sc1200_sht = {
 209         ATA_BMDMA_SHT(DRV_NAME),
 210         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 211 };
 212
 213 static struct ata_port_operations sc1200_port_ops = {
 214         .inherits       = &ata_bmdma_port_ops,
 215         .qc_prep        = ata_bmdma_dumb_qc_prep,
 216         .qc_issue       = sc1200_qc_issue,
 217         .qc_defer       = sc1200_qc_defer,
 218         .cable_detect   = ata_cable_40wire,
 219         .set_piomode    = sc1200_set_piomode,
 220         .set_dmamode    = sc1200_set_dmamode,
 221 };
 222
 223 /**
 224  *      sc1200_init_one         -       Initialise an SC1200
 225  *      @dev: PCI device
 226  *      @id: Entry in match table
 227  *
 228  *      Just throw the needed data at the libata helper and it does all
 229  *      our work.
 230  */
 231
 232 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 233 {
 234         static const struct ata_port_info info = {
 235                 .flags = ATA_FLAG_SLAVE_POSS,
 236                 .pio_mask = ATA_PIO4,
 237                 .mwdma_mask = ATA_MWDMA2,
 238                 .udma_mask = ATA_UDMA2,
 239                 .port_ops = &sc1200_port_ops
 240         };
 241         const struct ata_port_info *ppi[] = { &info, NULL };
 242
 243         return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
 244 }
 245
 246 static const struct pci_device_id sc1200[] = {
 247         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 248
 249         { },
 250 };
 251
 252 static struct pci_driver sc1200_pci_driver = {
 253         .name           = DRV_NAME,
 254         .id_table       = sc1200,
 255         .probe          = sc1200_init_one,
 256         .remove         = ata_pci_remove_one,
 257 #ifdef CONFIG_PM_SLEEP
 258         .suspend        = ata_pci_device_suspend,
 259         .resume         = ata_pci_device_resume,
 260 #endif
 261 };
 262
 263 module_pci_driver(sc1200_pci_driver);
 264
 265 MODULE_AUTHOR("Alan Cox, Mark Lord");
 266 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 267 MODULE_LICENSE("GPL");
 268 MODULE_DEVICE_TABLE(pci, sc1200);
 269 MODULE_VERSION(DRV_VERSION);