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/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
  57static 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
  86static 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
 120static 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
 166static 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
 191static 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
 209static struct scsi_host_template sc1200_sht = {
 210        ATA_BMDMA_SHT(DRV_NAME),
 211        .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 212};
 213
 214static 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
 233static 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
 247static const struct pci_device_id sc1200[] = {
 248        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 249
 250        { },
 251};
 252
 253static 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
 264module_pci_driver(sc1200_pci_driver);
 265
 266MODULE_AUTHOR("Alan Cox, Mark Lord");
 267MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 268MODULE_LICENSE("GPL");
 269MODULE_DEVICE_TABLE(pci, sc1200);
 270MODULE_VERSION(DRV_VERSION);
 271
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