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 = {
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 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