linux/drivers/ata/pata_sc1200.c
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   1/*
   2 * New ATA layer SC1200 driver          Alan Cox <alan@lxorguk.ukuu.org.uk>
   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
  58static 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
  87static 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
 117static 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
 163static 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
 181static struct scsi_host_template sc1200_sht = {
 182        ATA_BMDMA_SHT(DRV_NAME),
 183        .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 184};
 185
 186static 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
 204static 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
 219static const struct pci_device_id sc1200[] = {
 220        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 221
 222        { },
 223};
 224
 225static 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
 236static int __init sc1200_init(void)
 237{
 238        return pci_register_driver(&sc1200_pci_driver);
 239}
 240
 241static void __exit sc1200_exit(void)
 242{
 243        pci_unregister_driver(&sc1200_pci_driver);
 244}
 245
 246MODULE_AUTHOR("Alan Cox, Mark Lord");
 247MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 248MODULE_LICENSE("GPL");
 249MODULE_DEVICE_TABLE(pci, sc1200);
 250MODULE_VERSION(DRV_VERSION);
 251
 252module_init(sc1200_init);
 253module_exit(sc1200_exit);
 254