drivers/ide/pci/cs5520.c

   1 /*
   2  *      IDE tuning and bus mastering support for the CS5510/CS5520
   3  *      chipsets
   4  *
   5  *      The CS5510/CS5520 are slightly unusual devices. Unlike the
   6  *      typical IDE controllers they do bus mastering with the drive in
   7  *      PIO mode and smarter silicon.
   8  *
   9  *      The practical upshot of this is that we must always tune the
  10  *      drive for the right PIO mode. We must also ignore all the blacklists
  11  *      and the drive bus mastering DMA information.
  12  *
  13  *      *** This driver is strictly experimental ***
  14  *
  15  *      (c) Copyright Red Hat Inc 2002
  16  *
  17  * This program is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the
  19  * Free Software Foundation; either version 2, or (at your option) any
  20  * later version.
  21  *
  22  * This program is distributed in the hope that it will be useful, but
  23  * WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25  * General Public License for more details.
  26  *
  27  * For the avoidance of doubt the "preferred form" of this code is one which
  28  * is in an open non patent encumbered format. Where cryptographic key signing
  29  * forms part of the process of creating an executable the information
  30  * including keys needed to generate an equivalently functional executable
  31  * are deemed to be part of the source code.
  32  *
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/kernel.h>
  38 #include <linux/hdreg.h>
  39 #include <linux/init.h>
  40 #include <linux/pci.h>
  41 #include <linux/ide.h>
  42 #include <linux/dma-mapping.h>
  43
  44 struct pio_clocks
  45 {
  46         int address;
  47         int assert;
  48         int recovery;
  49 };
  50
  51 static struct pio_clocks cs5520_pio_clocks[]={
  52         {3, 6, 11},
  53         {2, 5, 6},
  54         {1, 4, 3},
  55         {1, 3, 2},
  56         {1, 2, 1}
  57 };
  58
  59 static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
  60 {
  61         ide_hwif_t *hwif = HWIF(drive);
  62         struct pci_dev *pdev = to_pci_dev(hwif->dev);
  63         int controller = drive->dn > 1 ? 1 : 0;
  64
  65         /* 8bit CAT/CRT - 8bit command timing for channel */
  66         pci_write_config_byte(pdev, 0x62 + controller,
  67                 (cs5520_pio_clocks[pio].recovery << 4) |
  68                 (cs5520_pio_clocks[pio].assert));
  69
  70         /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
  71
  72         /* FIXME: should these use address ? */
  73         /* Data read timing */
  74         pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
  75                 (cs5520_pio_clocks[pio].recovery << 4) |
  76                 (cs5520_pio_clocks[pio].assert));
  77         /* Write command timing */
  78         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
  79                 (cs5520_pio_clocks[pio].recovery << 4) |
  80                 (cs5520_pio_clocks[pio].assert));
  81 }
  82
  83 static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
  84 {
  85         printk(KERN_ERR "cs55x0: bad ide timing.\n");
  86
  87         cs5520_set_pio_mode(drive, 0);
  88 }
  89
  90 static const struct ide_port_ops cs5520_port_ops = {
  91         .set_pio_mode           = cs5520_set_pio_mode,
  92         .set_dma_mode           = cs5520_set_dma_mode,
  93 };
  94
  95 #define DECLARE_CS_DEV(name_str)                                \
  96         {                                                       \
  97                 .name           = name_str,                     \
  98                 .port_ops       = &cs5520_port_ops,             \
  99                 .host_flags     = IDE_HFLAG_ISA_PORTS |         \
 100                                   IDE_HFLAG_CS5520,             \
 101                 .pio_mask       = ATA_PIO4,                     \
 102         }
 103
 104 static const struct ide_port_info cyrix_chipsets[] __devinitdata = {
 105         /* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
 106         /* 1 */ DECLARE_CS_DEV("Cyrix 5520")
 107 };
 108
 109 /*
 110  *      The 5510/5520 are a bit weird. They don't quite set up the way
 111  *      the PCI helper layer expects so we must do much of the set up
 112  *      work longhand.
 113  */
 114
 115 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 116 {
 117         const struct ide_port_info *d = &cyrix_chipsets[id->driver_data];
 118         hw_regs_t hw[4], *hws[] = { NULL, NULL, NULL, NULL };
 119
 120         ide_setup_pci_noise(dev, d);
 121
 122         /* We must not grab the entire device, it has 'ISA' space in its
 123          * BARS too and we will freak out other bits of the kernel
 124          */
 125         if (pci_enable_device_io(dev)) {
 126                 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
 127                 return -ENODEV;
 128         }
 129         pci_set_master(dev);
 130         if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
 131                 printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
 132                 return -ENODEV;
 133         }
 134
 135         /*
 136          *      Now the chipset is configured we can let the core
 137          *      do all the device setup for us
 138          */
 139
 140         ide_pci_setup_ports(dev, d, 14, &hw[0], &hws[0]);
 141
 142         return ide_host_add(d, hws, NULL);
 143 }
 144
 145 static const struct pci_device_id cs5520_pci_tbl[] = {
 146         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
 147         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
 148         { 0, },
 149 };
 150 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
 151
 152 static struct pci_driver driver = {
 153         .name           = "Cyrix_IDE",
 154         .id_table       = cs5520_pci_tbl,
 155         .probe          = cs5520_init_one,
 156 };
 157
 158 static int __init cs5520_ide_init(void)
 159 {
 160         return ide_pci_register_driver(&driver);
 161 }
 162
 163 module_init(cs5520_ide_init);
 164
 165 MODULE_AUTHOR("Alan Cox");
 166 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
 167 MODULE_LICENSE("GPL");