tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/drivers/ide/legacy/ali14xx.c Version 0.03 Feb 09, 1996
3 *
4 * Copyright (C) 1996 Linus Torvalds & author (see below)
5 */
6
7/*
8 * ALI M14xx chipset EIDE controller
9 *
10 * Works for ALI M1439/1443/1445/1487/1489 chipsets.
11 *
12 * Adapted from code developed by derekn@vw.ece.cmu.edu. -ml
13 * Derek's notes follow:
14 *
15 * I think the code should be pretty understandable,
16 * but I'll be happy to (try to) answer questions.
17 *
18 * The critical part is in the setupDrive function. The initRegisters
19 * function doesn't seem to be necessary, but the DOS driver does it, so
20 * I threw it in.
21 *
22 * I've only tested this on my system, which only has one disk. I posted
23 * it to comp.sys.linux.hardware, so maybe some other people will try it
24 * out.
25 *
26 * Derek Noonburg (derekn@ece.cmu.edu)
27 * 95-sep-26
28 *
29 * Update 96-jul-13:
30 *
31 * I've since upgraded to two disks and a CD-ROM, with no trouble, and
32 * I've also heard from several others who have used it successfully.
33 * This driver appears to work with both the 1443/1445 and the 1487/1489
34 * chipsets. I've added support for PIO mode 4 for the 1487. This
35 * seems to work just fine on the 1443 also, although I'm not sure it's
36 * advertised as supporting mode 4. (I've been running a WDC AC21200 in
37 * mode 4 for a while now with no trouble.) -Derek
38 */
39
40#undef REALLY_SLOW_IO /* most systems can safely undef this */
41
42#include <linux/module.h>
43#include <linux/config.h>
44#include <linux/types.h>
45#include <linux/kernel.h>
46#include <linux/delay.h>
47#include <linux/timer.h>
48#include <linux/mm.h>
49#include <linux/ioport.h>
50#include <linux/blkdev.h>
51#include <linux/hdreg.h>
52#include <linux/ide.h>
53#include <linux/init.h>
54
55#include <asm/io.h>
56
57/* port addresses for auto-detection */
58#define ALI_NUM_PORTS 4
59static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
60
61/* register initialization data */
62typedef struct { u8 reg, data; } RegInitializer;
63
64static RegInitializer initData[] __initdata = {
65 {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
66 {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
67 {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
68 {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
69 {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
70 {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
71 {0x35, 0x03}, {0x00, 0x00}
72};
73
74#define ALI_MAX_PIO 4
75
76/* timing parameter registers for each drive */
77static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
78 {0x03, 0x26, 0x04, 0x27}, /* drive 0 */
79 {0x05, 0x28, 0x06, 0x29}, /* drive 1 */
80 {0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */
81 {0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */
82};
83
84static int basePort; /* base port address */
85static int regPort; /* port for register number */
86static int dataPort; /* port for register data */
87static u8 regOn; /* output to base port to access registers */
88static u8 regOff; /* output to base port to close registers */
89
90/*------------------------------------------------------------------------*/
91
92/*
93 * Read a controller register.
94 */
95static inline u8 inReg (u8 reg)
96{
97 outb_p(reg, regPort);
98 return inb(dataPort);
99}
100
101/*
102 * Write a controller register.
103 */
104static void outReg (u8 data, u8 reg)
105{
106 outb_p(reg, regPort);
107 outb_p(data, dataPort);
108}
109
110/*
111 * Set PIO mode for the specified drive.
112 * This function computes timing parameters
113 * and sets controller registers accordingly.
114 */
115static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
116{
117 int driveNum;
118 int time1, time2;
119 u8 param1, param2, param3, param4;
120 unsigned long flags;
121 ide_pio_data_t d;
122 int bus_speed = system_bus_clock();
123
124 pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
125
126 /* calculate timing, according to PIO mode */
127 time1 = d.cycle_time;
128 time2 = ide_pio_timings[pio].active_time;
129 param3 = param1 = (time2 * bus_speed + 999) / 1000;
130 param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
131 if (pio < 3) {
132 param3 += 8;
133 param4 += 8;
134 }
135 printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
136 drive->name, pio, time1, time2, param1, param2, param3, param4);
137
138 /* stuff timing parameters into controller registers */
139 driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
140 spin_lock_irqsave(&ide_lock, flags);
141 outb_p(regOn, basePort);
142 outReg(param1, regTab[driveNum].reg1);
143 outReg(param2, regTab[driveNum].reg2);
144 outReg(param3, regTab[driveNum].reg3);
145 outReg(param4, regTab[driveNum].reg4);
146 outb_p(regOff, basePort);
147 spin_unlock_irqrestore(&ide_lock, flags);
148}
149
150/*
151 * Auto-detect the IDE controller port.
152 */
153static int __init findPort (void)
154{
155 int i;
156 u8 t;
157 unsigned long flags;
158
159 local_irq_save(flags);
160 for (i = 0; i < ALI_NUM_PORTS; ++i) {
161 basePort = ports[i];
162 regOff = inb(basePort);
163 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
164 outb_p(regOn, basePort);
165 if (inb(basePort) == regOn) {
166 regPort = basePort + 4;
167 dataPort = basePort + 8;
168 t = inReg(0) & 0xf0;
169 outb_p(regOff, basePort);
170 local_irq_restore(flags);
171 if (t != 0x50)
172 return 0;
173 return 1; /* success */
174 }
175 }
176 outb_p(regOff, basePort);
177 }
178 local_irq_restore(flags);
179 return 0;
180}
181
182/*
183 * Initialize controller registers with default values.
184 */
185static int __init initRegisters (void) {
186 RegInitializer *p;
187 u8 t;
188 unsigned long flags;
189
190 local_irq_save(flags);
191 outb_p(regOn, basePort);
192 for (p = initData; p->reg != 0; ++p)
193 outReg(p->data, p->reg);
194 outb_p(0x01, regPort);
195 t = inb(regPort) & 0x01;
196 outb_p(regOff, basePort);
197 local_irq_restore(flags);
198 return t;
199}
200
201static int __init ali14xx_probe(void)
202{
203 ide_hwif_t *hwif, *mate;
204
205 printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
206 basePort, regOn);
207
208 /* initialize controller registers */
209 if (!initRegisters()) {
210 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
211 return 1;
212 }
213
214 hwif = &ide_hwifs[0];
215 mate = &ide_hwifs[1];
216
217 hwif->chipset = ide_ali14xx;
218 hwif->tuneproc = &ali14xx_tune_drive;
219 hwif->mate = mate;
220
221 mate->chipset = ide_ali14xx;
222 mate->tuneproc = &ali14xx_tune_drive;
223 mate->mate = hwif;
224 mate->channel = 1;
225
226 probe_hwif_init(hwif);
227 probe_hwif_init(mate);
228
229 create_proc_ide_interfaces();
230
231 return 0;
232}
233
234/* Can be called directly from ide.c. */
235int __init ali14xx_init(void)
236{
237 /* auto-detect IDE controller port */
238 if (findPort()) {
239 if (ali14xx_probe())
240 return -ENODEV;
241 return 0;
242 }
243 printk(KERN_ERR "ali14xx: not found.\n");
244 return -ENODEV;
245}
246
247#ifdef MODULE
248module_init(ali14xx_init);
249#endif
250
251MODULE_AUTHOR("see local file");
252MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
253MODULE_LICENSE("GPL");