linux/drivers/ata/pata_sc1200.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * New ATA layer SC1200 driver          Alan Cox <alan@lxorguk.ukuu.org.uk>
   4 *
   5 * TODO: Mode selection filtering
   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
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/pci.h>
  22#include <linux/blkdev.h>
  23#include <linux/delay.h>
  24#include <scsi/scsi_host.h>
  25#include <linux/libata.h>
  26
  27#define DRV_NAME        "pata_sc1200"
  28#define DRV_VERSION     "0.2.6"
  29
  30#define SC1200_REV_A    0x00
  31#define SC1200_REV_B1   0x01
  32#define SC1200_REV_B3   0x02
  33#define SC1200_REV_C1   0x03
  34#define SC1200_REV_D1   0x04
  35
  36/**
  37 *      sc1200_clock    -       PCI clock
  38 *
  39 *      Return the PCI bus clocking for the SC1200 chipset configuration
  40 *      in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
  41 */
  42
  43static int sc1200_clock(void)
  44{
  45        /* Magic registers that give us the chipset data */
  46        u8 chip_id = inb(0x903C);
  47        u8 silicon_rev = inb(0x903D);
  48        u16 pci_clock;
  49
  50        if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
  51                return 0;       /* 33 MHz mode */
  52
  53        /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
  54           0/3 is 33Mhz 1 is 48 2 is 66 */
  55
  56        pci_clock = inw(0x901E);
  57        pci_clock >>= 8;
  58        pci_clock &= 0x03;
  59        if (pci_clock == 3)
  60                pci_clock = 0;
  61        return pci_clock;
  62}
  63
  64/**
  65 *      sc1200_set_piomode              -       PIO setup
  66 *      @ap: ATA interface
  67 *      @adev: device on the interface
  68 *
  69 *      Set our PIO requirements. This is fairly simple on the SC1200
  70 */
  71
  72static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
  73{
  74        static const u32 pio_timings[4][5] = {
  75                /* format0, 33Mhz */
  76                { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
  77                /* format1, 33Mhz */
  78                { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
  79                /* format1, 48Mhz */
  80                { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
  81                /* format1, 66Mhz */
  82                { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
  83        };
  84
  85        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  86        u32 format;
  87        unsigned int reg = 0x40 + 0x10 * ap->port_no;
  88        int mode = adev->pio_mode - XFER_PIO_0;
  89
  90        pci_read_config_dword(pdev, reg + 4, &format);
  91        format >>= 31;
  92        format += sc1200_clock();
  93        pci_write_config_dword(pdev, reg + 8 * adev->devno,
  94                                pio_timings[format][mode]);
  95}
  96
  97/**
  98 *      sc1200_set_dmamode              -       DMA timing setup
  99 *      @ap: ATA interface
 100 *      @adev: Device being configured
 101 *
 102 *      We cannot mix MWDMA and UDMA without reloading timings each switch
 103 *      master to slave.
 104 */
 105
 106static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 107{
 108        static const u32 udma_timing[3][3] = {
 109                { 0x00921250, 0x00911140, 0x00911030 },
 110                { 0x00932470, 0x00922260, 0x00922140 },
 111                { 0x009436A1, 0x00933481, 0x00923261 }
 112        };
 113
 114        static const u32 mwdma_timing[3][3] = {
 115                { 0x00077771, 0x00012121, 0x00002020 },
 116                { 0x000BBBB2, 0x00024241, 0x00013131 },
 117                { 0x000FFFF3, 0x00035352, 0x00015151 }
 118        };
 119
 120        int clock = sc1200_clock();
 121        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 122        unsigned int reg = 0x40 + 0x10 * ap->port_no;
 123        int mode = adev->dma_mode;
 124        u32 format;
 125
 126        if (mode >= XFER_UDMA_0)
 127                format = udma_timing[clock][mode - XFER_UDMA_0];
 128        else
 129                format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
 130
 131        if (adev->devno == 0) {
 132                u32 timings;
 133
 134                pci_read_config_dword(pdev, reg + 4, &timings);
 135                timings &= 0x80000000UL;
 136                timings |= format;
 137                pci_write_config_dword(pdev, reg + 4, timings);
 138        } else
 139                pci_write_config_dword(pdev, reg + 12, format);
 140}
 141
 142/**
 143 *      sc1200_qc_issue         -       command issue
 144 *      @qc: command pending
 145 *
 146 *      Called when the libata layer is about to issue a command. We wrap
 147 *      this interface so that we can load the correct ATA timings if
 148 *      necessary.  Specifically we have a problem that there is only
 149 *      one MWDMA/UDMA bit.
 150 */
 151
 152static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
 153{
 154        struct ata_port *ap = qc->ap;
 155        struct ata_device *adev = qc->dev;
 156        struct ata_device *prev = ap->private_data;
 157
 158        /* See if the DMA settings could be wrong */
 159        if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
 160                /* Maybe, but do the channels match MWDMA/UDMA ? */
 161                if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
 162                    (ata_using_udma(prev) && !ata_using_udma(adev)))
 163                        /* Switch the mode bits */
 164                        sc1200_set_dmamode(ap, adev);
 165        }
 166
 167        return ata_bmdma_qc_issue(qc);
 168}
 169
 170/**
 171 *      sc1200_qc_defer -       implement serialization
 172 *      @qc: command
 173 *
 174 *      Serialize command issue on this controller.
 175 */
 176
 177static int sc1200_qc_defer(struct ata_queued_cmd *qc)
 178{
 179        struct ata_host *host = qc->ap->host;
 180        struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
 181        int rc;
 182
 183        /* First apply the usual rules */
 184        rc = ata_std_qc_defer(qc);
 185        if (rc != 0)
 186                return rc;
 187
 188        /* Now apply serialization rules. Only allow a command if the
 189           other channel state machine is idle */
 190        if (alt && alt->qc_active)
 191                return  ATA_DEFER_PORT;
 192        return 0;
 193}
 194
 195static struct scsi_host_template sc1200_sht = {
 196        ATA_BMDMA_SHT(DRV_NAME),
 197        .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 198};
 199
 200static struct ata_port_operations sc1200_port_ops = {
 201        .inherits       = &ata_bmdma_port_ops,
 202        .qc_prep        = ata_bmdma_dumb_qc_prep,
 203        .qc_issue       = sc1200_qc_issue,
 204        .qc_defer       = sc1200_qc_defer,
 205        .cable_detect   = ata_cable_40wire,
 206        .set_piomode    = sc1200_set_piomode,
 207        .set_dmamode    = sc1200_set_dmamode,
 208};
 209
 210/**
 211 *      sc1200_init_one         -       Initialise an SC1200
 212 *      @dev: PCI device
 213 *      @id: Entry in match table
 214 *
 215 *      Just throw the needed data at the libata helper and it does all
 216 *      our work.
 217 */
 218
 219static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 220{
 221        static const struct ata_port_info info = {
 222                .flags = ATA_FLAG_SLAVE_POSS,
 223                .pio_mask = ATA_PIO4,
 224                .mwdma_mask = ATA_MWDMA2,
 225                .udma_mask = ATA_UDMA2,
 226                .port_ops = &sc1200_port_ops
 227        };
 228        const struct ata_port_info *ppi[] = { &info, NULL };
 229
 230        return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
 231}
 232
 233static const struct pci_device_id sc1200[] = {
 234        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 235
 236        { },
 237};
 238
 239static struct pci_driver sc1200_pci_driver = {
 240        .name           = DRV_NAME,
 241        .id_table       = sc1200,
 242        .probe          = sc1200_init_one,
 243        .remove         = ata_pci_remove_one,
 244#ifdef CONFIG_PM_SLEEP
 245        .suspend        = ata_pci_device_suspend,
 246        .resume         = ata_pci_device_resume,
 247#endif
 248};
 249
 250module_pci_driver(sc1200_pci_driver);
 251
 252MODULE_AUTHOR("Alan Cox, Mark Lord");
 253MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 254MODULE_LICENSE("GPL");
 255MODULE_DEVICE_TABLE(pci, sc1200);
 256MODULE_VERSION(DRV_VERSION);
 257