root/drivers/ata/pata_triflex.c

DEFINITIONS

1. triflex_prereset
2. triflex_load_timing
3. triflex_set_piomode
4. triflex_bmdma_start
5. triflex_bmdma_stop
6. triflex_init_one
7. triflex_ata_pci_device_suspend

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * pata_triflex.c       - Compaq PATA for new ATA layer
   4  *                        (C) 2005 Red Hat Inc
   5  *                        Alan Cox <alan@lxorguk.ukuu.org.uk>
   6  *
   7  * based upon
   8  *
   9  * triflex.c
  10  *
  11  * IDE Chipset driver for the Compaq TriFlex IDE controller.
  12  *
  13  * Known to work with the Compaq Workstation 5x00 series.
  14  *
  15  * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
  16  * Author: Torben Mathiasen <torben.mathiasen@hp.com>
  17  *
  18  * Loosely based on the piix & svwks drivers.
  19  *
  20  * Documentation:
  21  *      Not publicly available.
  22  */
  23 
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/pci.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/delay.h>
  29 #include <scsi/scsi_host.h>
  30 #include <linux/libata.h>
  31 
  32 #define DRV_NAME "pata_triflex"
  33 #define DRV_VERSION "0.2.8"
  34 
  35 /**
  36  *      triflex_prereset                -       probe begin
  37  *      @link: ATA link
  38  *      @deadline: deadline jiffies for the operation
  39  *
  40  *      Set up cable type and use generic probe init
  41  */
  42 
  43 static int triflex_prereset(struct ata_link *link, unsigned long deadline)
  44 {
  45         static const struct pci_bits triflex_enable_bits[] = {
  46                 { 0x80, 1, 0x01, 0x01 },
  47                 { 0x80, 1, 0x02, 0x02 }
  48         };
  49 
  50         struct ata_port *ap = link->ap;
  51         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  52 
  53         if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
  54                 return -ENOENT;
  55 
  56         return ata_sff_prereset(link, deadline);
  57 }
  58 
  59 
  60 
  61 /**
  62  *      triflex_load_timing             -       timing configuration
  63  *      @ap: ATA interface
  64  *      @adev: Device on the bus
  65  *      @speed: speed to configure
  66  *
  67  *      The Triflex has one set of timings per device per channel. This
  68  *      means we must do some switching. As the PIO and DMA timings don't
  69  *      match we have to do some reloading unlike PIIX devices where tuning
  70  *      tricks can avoid it.
  71  */
  72 
  73 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
  74 {
  75         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  76         u32 timing = 0;
  77         u32 triflex_timing, old_triflex_timing;
  78         int channel_offset = ap->port_no ? 0x74: 0x70;
  79         unsigned int is_slave   = (adev->devno != 0);
  80 
  81 
  82         pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
  83         triflex_timing = old_triflex_timing;
  84 
  85         switch(speed)
  86         {
  87                 case XFER_MW_DMA_2:
  88                         timing = 0x0103;break;
  89                 case XFER_MW_DMA_1:
  90                         timing = 0x0203;break;
  91                 case XFER_MW_DMA_0:
  92                         timing = 0x0808;break;
  93                 case XFER_SW_DMA_2:
  94                 case XFER_SW_DMA_1:
  95                 case XFER_SW_DMA_0:
  96                         timing = 0x0F0F;break;
  97                 case XFER_PIO_4:
  98                         timing = 0x0202;break;
  99                 case XFER_PIO_3:
 100                         timing = 0x0204;break;
 101                 case XFER_PIO_2:
 102                         timing = 0x0404;break;
 103                 case XFER_PIO_1:
 104                         timing = 0x0508;break;
 105                 case XFER_PIO_0:
 106                         timing = 0x0808;break;
 107                 default:
 108                         BUG();
 109         }
 110         triflex_timing &= ~ (0xFFFF << (16 * is_slave));
 111         triflex_timing |= (timing << (16 * is_slave));
 112 
 113         if (triflex_timing != old_triflex_timing)
 114                 pci_write_config_dword(pdev, channel_offset, triflex_timing);
 115 }
 116 
 117 /**
 118  *      triflex_set_piomode     -       set initial PIO mode data
 119  *      @ap: ATA interface
 120  *      @adev: ATA device
 121  *
 122  *      Use the timing loader to set up the PIO mode. We have to do this
 123  *      because DMA start/stop will only be called once DMA occurs. If there
 124  *      has been no DMA then the PIO timings are still needed.
 125  */
 126 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
 127 {
 128         triflex_load_timing(ap, adev, adev->pio_mode);
 129 }
 130 
 131 /**
 132  *      triflex_dma_start       -       DMA start callback
 133  *      @qc: Command in progress
 134  *
 135  *      Usually drivers set the DMA timing at the point the set_dmamode call
 136  *      is made. Triflex however requires we load new timings on the
 137  *      transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
 138  *      We load the DMA timings just before starting DMA and then restore
 139  *      the PIO timing when the DMA is finished.
 140  */
 141 
 142 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
 143 {
 144         triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
 145         ata_bmdma_start(qc);
 146 }
 147 
 148 /**
 149  *      triflex_dma_stop        -       DMA stop callback
 150  *      @ap: ATA interface
 151  *      @adev: ATA device
 152  *
 153  *      We loaded new timings in dma_start, as a result we need to restore
 154  *      the PIO timings in dma_stop so that the next command issue gets the
 155  *      right clock values.
 156  */
 157 
 158 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
 159 {
 160         ata_bmdma_stop(qc);
 161         triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
 162 }
 163 
 164 static struct scsi_host_template triflex_sht = {
 165         ATA_BMDMA_SHT(DRV_NAME),
 166 };
 167 
 168 static struct ata_port_operations triflex_port_ops = {
 169         .inherits       = &ata_bmdma_port_ops,
 170         .bmdma_start    = triflex_bmdma_start,
 171         .bmdma_stop     = triflex_bmdma_stop,
 172         .cable_detect   = ata_cable_40wire,
 173         .set_piomode    = triflex_set_piomode,
 174         .prereset       = triflex_prereset,
 175 };
 176 
 177 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 178 {
 179         static const struct ata_port_info info = {
 180                 .flags = ATA_FLAG_SLAVE_POSS,
 181                 .pio_mask = ATA_PIO4,
 182                 .mwdma_mask = ATA_MWDMA2,
 183                 .port_ops = &triflex_port_ops
 184         };
 185         const struct ata_port_info *ppi[] = { &info, NULL };
 186 
 187         ata_print_version_once(&dev->dev, DRV_VERSION);
 188 
 189         return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
 190 }
 191 
 192 static const struct pci_device_id triflex[] = {
 193         { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
 194 
 195         { },
 196 };
 197 
 198 #ifdef CONFIG_PM_SLEEP
 199 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
 200 {
 201         struct ata_host *host = pci_get_drvdata(pdev);
 202         int rc = 0;
 203 
 204         rc = ata_host_suspend(host, mesg);
 205         if (rc)
 206                 return rc;
 207 
 208         /*
 209          * We must not disable or powerdown the device.
 210          * APM bios refuses to suspend if IDE is not accessible.
 211          */
 212         pci_save_state(pdev);
 213 
 214         return 0;
 215 }
 216 
 217 #endif
 218 
 219 static struct pci_driver triflex_pci_driver = {
 220         .name           = DRV_NAME,
 221         .id_table       = triflex,
 222         .probe          = triflex_init_one,
 223         .remove         = ata_pci_remove_one,
 224 #ifdef CONFIG_PM_SLEEP
 225         .suspend        = triflex_ata_pci_device_suspend,
 226         .resume         = ata_pci_device_resume,
 227 #endif
 228 };
 229 
 230 module_pci_driver(triflex_pci_driver);
 231 
 232 MODULE_AUTHOR("Alan Cox");
 233 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
 234 MODULE_LICENSE("GPL");
 235 MODULE_DEVICE_TABLE(pci, triflex);
 236 MODULE_VERSION(DRV_VERSION);