2 * IDE tuning and bus mastering support for the CS5510/CS5520
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.
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.
13 * *** This driver is strictly experimental ***
15 * (c) Copyright Red Hat Inc 2002
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
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.
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.
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>
44 #define DRV_NAME "cs5520"
53 static struct pio_clocks cs5520_pio_clocks[]={
61 static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
63 ide_hwif_t *hwif = HWIF(drive);
64 struct pci_dev *pdev = to_pci_dev(hwif->dev);
65 int controller = drive->dn > 1 ? 1 : 0;
67 /* 8bit CAT/CRT - 8bit command timing for channel */
68 pci_write_config_byte(pdev, 0x62 + controller,
69 (cs5520_pio_clocks[pio].recovery << 4) |
70 (cs5520_pio_clocks[pio].assert));
72 /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
74 /* FIXME: should these use address ? */
75 /* Data read timing */
76 pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
77 (cs5520_pio_clocks[pio].recovery << 4) |
78 (cs5520_pio_clocks[pio].assert));
79 /* Write command timing */
80 pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
81 (cs5520_pio_clocks[pio].recovery << 4) |
82 (cs5520_pio_clocks[pio].assert));
85 static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
87 printk(KERN_ERR "cs55x0: bad ide timing.\n");
89 cs5520_set_pio_mode(drive, 0);
92 static const struct ide_port_ops cs5520_port_ops = {
93 .set_pio_mode = cs5520_set_pio_mode,
94 .set_dma_mode = cs5520_set_dma_mode,
97 static const struct ide_port_info cyrix_chipset __devinitdata = {
99 .port_ops = &cs5520_port_ops,
100 .host_flags = IDE_HFLAG_ISA_PORTS | IDE_HFLAG_CS5520,
101 .pio_mask = ATA_PIO4,
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
110 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
112 const struct ide_port_info *d = &cyrix_chipset;
113 hw_regs_t hw[4], *hws[] = { NULL, NULL, NULL, NULL };
115 ide_setup_pci_noise(dev, d);
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
120 if (pci_enable_device_io(dev)) {
121 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
125 if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
126 printk(KERN_WARNING "%s: No suitable DMA available.\n",
132 * Now the chipset is configured we can let the core
133 * do all the device setup for us
136 ide_pci_setup_ports(dev, d, 14, &hw[0], &hws[0]);
138 return ide_host_add(d, hws, NULL);
141 static const struct pci_device_id cs5520_pci_tbl[] = {
142 { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), 0 },
143 { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), 1 },
146 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
148 static struct pci_driver driver = {
150 .id_table = cs5520_pci_tbl,
151 .probe = cs5520_init_one,
154 static int __init cs5520_ide_init(void)
156 return ide_pci_register_driver(&driver);
159 module_init(cs5520_ide_init);
161 MODULE_AUTHOR("Alan Cox");
162 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
163 MODULE_LICENSE("GPL");