1/*
2 *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
3 */
4
5/*
6 *  Principal Author/Maintainer:  PODIEN@hml2.atlas.de (Wolfram Podien)
7 *
8 *  This file provides support for the advanced features
9 *  of the UMC 8672 IDE interface.
10 *
11 *  Version 0.01	Initial version, hacked out of ide.c,
12 *			and #include'd rather than compiled separately.
13 *			This will get cleaned up in a subsequent release.
14 *
15 *  Version 0.02	now configs/compiles separate from ide.c  -ml
16 *  Version 0.03	enhanced auto-tune, fix display bug
17 *  Version 0.05	replace sti() with restore_flags()  -ml
18 *			add detection of possible race condition  -ml
19 */
20
21/*
22 * VLB Controller Support from
23 * Wolfram Podien
24 * Rohoefe 3
25 * D28832 Achim
26 * Germany
27 *
28 * To enable UMC8672 support there must a lilo line like
29 * append="ide0=umc8672"...
30 * To set the speed according to the abilities of the hardware there must be a
31 * line like
32 * #define UMC_DRIVE0 11
33 * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
34 * are some lines present). 0 - 11 are allowed speed values. These values are
35 * the results from the DOS speed test program supplied from UMC. 11 is the
36 * highest speed (about PIO mode 3)
37 */
38#define REALLY_SLOW_IO		/* some systems can safely undef this */
39
40#include <linux/module.h>
41#include <linux/types.h>
42#include <linux/kernel.h>
43#include <linux/delay.h>
44#include <linux/timer.h>
45#include <linux/mm.h>
46#include <linux/ioport.h>
47#include <linux/blkdev.h>
48#include <linux/ide.h>
49#include <linux/init.h>
50
51#include <asm/io.h>
52
53#define DRV_NAME "umc8672"
54
55/*
56 * Default speeds.  These can be changed with "auto-tune" and/or hdparm.
57 */
58#define UMC_DRIVE0      1              /* DOS measured drive speeds */
59#define UMC_DRIVE1      1              /* 0 to 11 allowed */
60#define UMC_DRIVE2      1              /* 11 = Fastest Speed */
61#define UMC_DRIVE3      1              /* In case of crash reduce speed */
62
63static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
64static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11};	/* rough guesses */
65
66/*       0    1    2    3    4    5    6    7    8    9    10   11      */
67static const u8 speedtab [3][12] = {
68	{0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
69	{0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
70	{0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
71};
72
73static void out_umc(char port, char wert)
74{
75	outb_p(port, 0x108);
76	outb_p(wert, 0x109);
77}
78
79static inline u8 in_umc(char port)
80{
81	outb_p(port, 0x108);
82	return inb_p(0x109);
83}
84
85static void umc_set_speeds(u8 speeds[])
86{
87	int i, tmp;
88
89	outb_p(0x5A, 0x108); /* enable umc */
90
91	out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
92	out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
93	tmp = 0;
94	for (i = 3; i >= 0; i--)
95		tmp = (tmp << 2) | speedtab[1][speeds[i]];
96	out_umc(0xdc, tmp);
97	for (i = 0; i < 4; i++) {
98		out_umc(0xd0 + i, speedtab[2][speeds[i]]);
99		out_umc(0xd8 + i, speedtab[2][speeds[i]]);
100	}
101	outb_p(0xa5, 0x108); /* disable umc */
102
103	printk("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
104		speeds[0], speeds[1], speeds[2], speeds[3]);
105}
106
107static void umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
108{
109	ide_hwif_t *mate = hwif->mate;
110	unsigned long uninitialized_var(flags);
111	const u8 pio = drive->pio_mode - XFER_PIO_0;
112
113	printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
114		drive->name, pio, pio_to_umc[pio]);
115	if (mate)
116		spin_lock_irqsave(&mate->lock, flags);
117	if (mate && mate->handler) {
118		printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
119	} else {
120		current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
121		umc_set_speeds(current_speeds);
122	}
123	if (mate)
124		spin_unlock_irqrestore(&mate->lock, flags);
125}
126
127static const struct ide_port_ops umc8672_port_ops = {
128	.set_pio_mode		= umc_set_pio_mode,
129};
130
131static const struct ide_port_info umc8672_port_info __initconst = {
132	.name			= DRV_NAME,
133	.chipset		= ide_umc8672,
134	.port_ops		= &umc8672_port_ops,
135	.host_flags		= IDE_HFLAG_NO_DMA,
136	.pio_mask		= ATA_PIO4,
137};
138
139static int __init umc8672_probe(void)
140{
141	unsigned long flags;
142
143	if (!request_region(0x108, 2, "umc8672")) {
144		printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
145		return 1;
146	}
147	local_irq_save(flags);
148	outb_p(0x5A, 0x108); /* enable umc */
149	if (in_umc (0xd5) != 0xa0) {
150		local_irq_restore(flags);
151		printk(KERN_ERR "umc8672: not found\n");
152		release_region(0x108, 2);
153		return 1;
154	}
155	outb_p(0xa5, 0x108); /* disable umc */
156
157	umc_set_speeds(current_speeds);
158	local_irq_restore(flags);
159
160	return ide_legacy_device_add(&umc8672_port_info, 0);
161}
162
163static bool probe_umc8672;
164
165module_param_named(probe, probe_umc8672, bool, 0);
166MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
167
168static int __init umc8672_init(void)
169{
170	if (probe_umc8672 == 0)
171		goto out;
172
173	if (umc8672_probe() == 0)
174		return 0;
175out:
176	return -ENODEV;
177}
178
179module_init(umc8672_init);
180
181MODULE_AUTHOR("Wolfram Podien");
182MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
183MODULE_LICENSE("GPL");
184