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/init.h>
39 #include <linux/pci.h>
40 #include <linux/ide.h>
41 #include <linux/dma-mapping.h>
43 #define DRV_NAME "cs5520"
52 static struct pio_clocks cs5520_pio_clocks[]={
60 static void cs5520_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
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;
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));
71 /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
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));
84 static void cs5520_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
86 printk(KERN_ERR "cs55x0: bad ide timing.\n");
88 drive->pio_mode = XFER_PIO_0 + 0;
89 cs5520_set_pio_mode(hwif, drive);
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 = {
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,
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
111 static int cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
113 const struct ide_port_info *d = &cyrix_chipset;
114 struct ide_hw hw[2], *hws[] = { NULL, NULL };
116 ide_setup_pci_noise(dev, d);
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
121 if (pci_enable_device_io(dev)) {
122 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
126 if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
127 printk(KERN_WARNING "%s: No suitable DMA available.\n",
133 * Now the chipset is configured we can let the core
134 * do all the device setup for us
137 ide_pci_setup_ports(dev, d, &hw[0], &hws[0]);
141 return ide_host_add(d, hws, 2, NULL);
144 static 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 },
149 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
151 static struct pci_driver cs5520_pci_driver = {
153 .id_table = cs5520_pci_tbl,
154 .probe = cs5520_init_one,
155 .suspend = ide_pci_suspend,
156 .resume = ide_pci_resume,
159 static int __init cs5520_ide_init(void)
161 return ide_pci_register_driver(&cs5520_pci_driver);
164 module_init(cs5520_ide_init);
166 MODULE_AUTHOR("Alan Cox");
167 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
168 MODULE_LICENSE("GPL");