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: 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
  56static 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
  85static 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
 119static 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
 165static 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
 190static 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
 208static struct scsi_host_template sc1200_sht = {
 209        ATA_BMDMA_SHT(DRV_NAME),
 210        .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 211};
 212
 213static 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
 232static 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
 246static const struct pci_device_id sc1200[] = {
 247        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 248
 249        { },
 250};
 251
 252static 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
 263module_pci_driver(sc1200_pci_driver);
 264
 265MODULE_AUTHOR("Alan Cox, Mark Lord");
 266MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 267MODULE_LICENSE("GPL");
 268MODULE_DEVICE_TABLE(pci, sc1200);
 269MODULE_VERSION(DRV_VERSION);
 270
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