drivers/ata/pata_sc1200.c

   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
  43 static 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
  72 static 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
 106 static 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
 152 static 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
 177 static 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
 195 static struct scsi_host_template sc1200_sht = {
 196         ATA_BMDMA_SHT(DRV_NAME),
 197         .sg_tablesize   = LIBATA_DUMB_MAX_PRD,
 198 };
 199
 200 static 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
 219 static 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
 233 static const struct pci_device_id sc1200[] = {
 234         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
 235
 236         { },
 237 };
 238
 239 static 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
 250 module_pci_driver(sc1200_pci_driver);
 251
 252 MODULE_AUTHOR("Alan Cox, Mark Lord");
 253 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
 254 MODULE_LICENSE("GPL");
 255 MODULE_DEVICE_TABLE(pci, sc1200);
 256 MODULE_VERSION(DRV_VERSION);