drivers/ide/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/init.h>
  39 #include <linux/pci.h>
  40 #include <linux/ide.h>
  41 #include <linux/dma-mapping.h>
  42
  43 #define DRV_NAME "cs5520"
  44
  45 struct pio_clocks
  46 {
  47         int address;
  48         int assert;
  49         int recovery;
  50 };
  51
  52 static struct pio_clocks cs5520_pio_clocks[]={
  53         {3, 6, 11},
  54         {2, 5, 6},
  55         {1, 4, 3},
  56         {1, 3, 2},
  57         {1, 2, 1}
  58 };
  59
  60 static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
  61 {
  62         ide_hwif_t *hwif = drive->hwif;
  63         struct pci_dev *pdev = to_pci_dev(hwif->dev);
  64         int controller = drive->dn > 1 ? 1 : 0;
  65
  66         /* 8bit CAT/CRT - 8bit command timing for channel */
  67         pci_write_config_byte(pdev, 0x62 + controller,
  68                 (cs5520_pio_clocks[pio].recovery << 4) |
  69                 (cs5520_pio_clocks[pio].assert));
  70
  71         /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
  72
  73         /* FIXME: should these use address ? */
  74         /* Data read timing */
  75         pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
  76                 (cs5520_pio_clocks[pio].recovery << 4) |
  77                 (cs5520_pio_clocks[pio].assert));
  78         /* Write command timing */
  79         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
  80                 (cs5520_pio_clocks[pio].recovery << 4) |
  81                 (cs5520_pio_clocks[pio].assert));
  82 }
  83
  84 static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
  85 {
  86         printk(KERN_ERR "cs55x0: bad ide timing.\n");
  87
  88         cs5520_set_pio_mode(drive, 0);
  89 }
  90
  91 static const struct ide_port_ops cs5520_port_ops = {
  92         .set_pio_mode           = cs5520_set_pio_mode,
  93         .set_dma_mode           = cs5520_set_dma_mode,
  94 };
  95
  96 static const struct ide_port_info cyrix_chipset __devinitdata = {
  97         .name           = DRV_NAME,
  98         .enablebits     = { { 0x60, 0x01, 0x01 }, { 0x60, 0x02, 0x02 } },
  99         .port_ops       = &cs5520_port_ops,
 100         .host_flags     = IDE_HFLAG_ISA_PORTS | IDE_HFLAG_CS5520,
 101         .pio_mask       = ATA_PIO4,
 102 };
 103
 104 /*
 105  *      The 5510/5520 are a bit weird. They don't quite set up the way
 106  *      the PCI helper layer expects so we must do much of the set up
 107  *      work longhand.
 108  */
 109
 110 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 111 {
 112         const struct ide_port_info *d = &cyrix_chipset;
 113         hw_regs_t hw[4], *hws[] = { NULL, NULL, NULL, NULL };
 114
 115         ide_setup_pci_noise(dev, d);
 116
 117         /* We must not grab the entire device, it has 'ISA' space in its
 118          * BARS too and we will freak out other bits of the kernel
 119          */
 120         if (pci_enable_device_io(dev)) {
 121                 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
 122                 return -ENODEV;
 123         }
 124         pci_set_master(dev);
 125         if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
 126                 printk(KERN_WARNING "%s: No suitable DMA available.\n",
 127                         d->name);
 128                 return -ENODEV;
 129         }
 130
 131         /*
 132          *      Now the chipset is configured we can let the core
 133          *      do all the device setup for us
 134          */
 135
 136         ide_pci_setup_ports(dev, d, &hw[0], &hws[0]);
 137         hw[0].irq = 14;
 138
 139         return ide_host_add(d, hws, NULL);
 140 }
 141
 142 static const struct pci_device_id cs5520_pci_tbl[] = {
 143         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
 144         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
 145         { 0, },
 146 };
 147 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
 148
 149 static struct pci_driver cs5520_pci_driver = {
 150         .name           = "Cyrix_IDE",
 151         .id_table       = cs5520_pci_tbl,
 152         .probe          = cs5520_init_one,
 153         .suspend        = ide_pci_suspend,
 154         .resume         = ide_pci_resume,
 155 };
 156
 157 static int __init cs5520_ide_init(void)
 158 {
 159         return ide_pci_register_driver(&cs5520_pci_driver);
 160 }
 161
 162 module_init(cs5520_ide_init);
 163
 164 MODULE_AUTHOR("Alan Cox");
 165 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
 166 MODULE_LICENSE("GPL");