linux/drivers/ide/cs5520.c
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   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
  45struct pio_clocks
  46{
  47        int address;
  48        int assert;
  49        int recovery;
  50};
  51
  52static 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
  60static void cs5520_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  61{
  62        struct pci_dev *pdev = to_pci_dev(hwif->dev);
  63        int controller = drive->dn > 1 ? 1 : 0;
  64        const u8 pio = drive->pio_mode - XFER_PIO_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
  84static void cs5520_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  85{
  86        printk(KERN_ERR "cs55x0: bad ide timing.\n");
  87
  88        drive->pio_mode = XFER_PIO_0 + 0;
  89        cs5520_set_pio_mode(hwif, drive);
  90}
  91
  92static const struct ide_port_ops cs5520_port_ops = {
  93        .set_pio_mode           = cs5520_set_pio_mode,
  94        .set_dma_mode           = cs5520_set_dma_mode,
  95};
  96
  97static const struct ide_port_info cyrix_chipset __devinitdata = {
  98        .name           = DRV_NAME,
  99        .enablebits     = { { 0x60, 0x01, 0x01 }, { 0x60, 0x02, 0x02 } },
 100        .port_ops       = &cs5520_port_ops,
 101        .host_flags     = IDE_HFLAG_ISA_PORTS | IDE_HFLAG_CS5520,
 102        .pio_mask       = ATA_PIO4,
 103};
 104
 105/*
 106 *      The 5510/5520 are a bit weird. They don't quite set up the way
 107 *      the PCI helper layer expects so we must do much of the set up 
 108 *      work longhand.
 109 */
 110 
 111static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 112{
 113        const struct ide_port_info *d = &cyrix_chipset;
 114        struct ide_hw hw[2], *hws[] = { NULL, NULL };
 115
 116        ide_setup_pci_noise(dev, d);
 117
 118        /* We must not grab the entire device, it has 'ISA' space in its
 119         * BARS too and we will freak out other bits of the kernel
 120         */
 121        if (pci_enable_device_io(dev)) {
 122                printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
 123                return -ENODEV;
 124        }
 125        pci_set_master(dev);
 126        if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
 127                printk(KERN_WARNING "%s: No suitable DMA available.\n",
 128                        d->name);
 129                return -ENODEV;
 130        }
 131
 132        /*
 133         *      Now the chipset is configured we can let the core
 134         *      do all the device setup for us
 135         */
 136
 137        ide_pci_setup_ports(dev, d, &hw[0], &hws[0]);
 138        hw[0].irq = 14;
 139        hw[1].irq = 15;
 140
 141        return ide_host_add(d, hws, 2, NULL);
 142}
 143
 144static const struct pci_device_id cs5520_pci_tbl[] = {
 145        { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
 146        { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
 147        { 0, },
 148};
 149MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
 150
 151static struct pci_driver cs5520_pci_driver = {
 152        .name           = "Cyrix_IDE",
 153        .id_table       = cs5520_pci_tbl,
 154        .probe          = cs5520_init_one,
 155        .suspend        = ide_pci_suspend,
 156        .resume         = ide_pci_resume,
 157};
 158
 159static int __init cs5520_ide_init(void)
 160{
 161        return ide_pci_register_driver(&cs5520_pci_driver);
 162}
 163
 164module_init(cs5520_ide_init);
 165
 166MODULE_AUTHOR("Alan Cox");
 167MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
 168MODULE_LICENSE("GPL");
 169
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