File: /usr/src/linux/drivers/ide/ali14xx.c
1 /*
2 * linux/drivers/ide/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/types.h>
43 #include <linux/kernel.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/mm.h>
47 #include <linux/ioport.h>
48 #include <linux/blkdev.h>
49 #include <linux/hdreg.h>
50 #include <linux/ide.h>
51 #include <linux/init.h>
52
53 #include <asm/io.h>
54
55 #include "ide_modes.h"
56
57 /* port addresses for auto-detection */
58 #define ALI_NUM_PORTS 4
59 static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
60
61 /* register initialization data */
62 typedef struct { byte reg, data; } RegInitializer;
63
64 static 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 */
77 static struct { byte 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
84 static int basePort; /* base port address */
85 static int regPort; /* port for register number */
86 static int dataPort; /* port for register data */
87 static byte regOn; /* output to base port to access registers */
88 static byte regOff; /* output to base port to close registers */
89
90 /*------------------------------------------------------------------------*/
91
92 /*
93 * Read a controller register.
94 */
95 static inline byte inReg (byte reg)
96 {
97 outb_p(reg, regPort);
98 return inb(dataPort);
99 }
100
101 /*
102 * Write a controller register.
103 */
104 static void outReg (byte data, byte 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 */
115 static void ali14xx_tune_drive (ide_drive_t *drive, byte pio)
116 {
117 int driveNum;
118 int time1, time2;
119 byte 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("%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 save_flags(flags); /* all CPUs */
141 cli(); /* all CPUs */
142 outb_p(regOn, basePort);
143 outReg(param1, regTab[driveNum].reg1);
144 outReg(param2, regTab[driveNum].reg2);
145 outReg(param3, regTab[driveNum].reg3);
146 outReg(param4, regTab[driveNum].reg4);
147 outb_p(regOff, basePort);
148 restore_flags(flags); /* all CPUs */
149 }
150
151 /*
152 * Auto-detect the IDE controller port.
153 */
154 static int __init findPort (void)
155 {
156 int i;
157 byte t;
158 unsigned long flags;
159
160 __save_flags(flags); /* local CPU only */
161 __cli(); /* local CPU only */
162 for (i = 0; i < ALI_NUM_PORTS; ++i) {
163 basePort = ports[i];
164 regOff = inb(basePort);
165 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
166 outb_p(regOn, basePort);
167 if (inb(basePort) == regOn) {
168 regPort = basePort + 4;
169 dataPort = basePort + 8;
170 t = inReg(0) & 0xf0;
171 outb_p(regOff, basePort);
172 __restore_flags(flags); /* local CPU only */
173 if (t != 0x50)
174 return 0;
175 return 1; /* success */
176 }
177 }
178 outb_p(regOff, basePort);
179 }
180 __restore_flags(flags); /* local CPU only */
181 return 0;
182 }
183
184 /*
185 * Initialize controller registers with default values.
186 */
187 static int __init initRegisters (void) {
188 RegInitializer *p;
189 byte t;
190 unsigned long flags;
191
192 __save_flags(flags); /* local CPU only */
193 __cli(); /* local CPU only */
194 outb_p(regOn, basePort);
195 for (p = initData; p->reg != 0; ++p)
196 outReg(p->data, p->reg);
197 outb_p(0x01, regPort);
198 t = inb(regPort) & 0x01;
199 outb_p(regOff, basePort);
200 __restore_flags(flags); /* local CPU only */
201 return t;
202 }
203
204 void __init init_ali14xx (void)
205 {
206 /* auto-detect IDE controller port */
207 if (!findPort()) {
208 printk("\nali14xx: not found");
209 return;
210 }
211
212 printk("\nali14xx: base= 0x%03x, regOn = 0x%02x", basePort, regOn);
213 ide_hwifs[0].chipset = ide_ali14xx;
214 ide_hwifs[1].chipset = ide_ali14xx;
215 ide_hwifs[0].tuneproc = &ali14xx_tune_drive;
216 ide_hwifs[1].tuneproc = &ali14xx_tune_drive;
217 ide_hwifs[0].mate = &ide_hwifs[1];
218 ide_hwifs[1].mate = &ide_hwifs[0];
219 ide_hwifs[1].channel = 1;
220
221 /* initialize controller registers */
222 if (!initRegisters()) {
223 printk("\nali14xx: Chip initialization failed");
224 return;
225 }
226 }
227