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 #ifdef CONFIG_BLK_DEV_ALI14XX_MODULE
58 # define _IDE_C
59 # include "ide_modes.h"
60 # undef _IDE_C
61 #else
62 # include "ide_modes.h"
63 #endif /* CONFIG_BLK_DEV_ALI14XX_MODULE */
64
65 /* port addresses for auto-detection */
66 #define ALI_NUM_PORTS 4
67 static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
68
69 /* register initialization data */
70 typedef struct { u8 reg, data; } RegInitializer;
71
72 static RegInitializer initData[] __initdata = {
73 {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
74 {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
75 {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
76 {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
77 {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
78 {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
79 {0x35, 0x03}, {0x00, 0x00}
80 };
81
82 #define ALI_MAX_PIO 4
83
84 /* timing parameter registers for each drive */
85 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
86 {0x03, 0x26, 0x04, 0x27}, /* drive 0 */
87 {0x05, 0x28, 0x06, 0x29}, /* drive 1 */
88 {0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */
89 {0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */
90 };
91
92 static int basePort; /* base port address */
93 static int regPort; /* port for register number */
94 static int dataPort; /* port for register data */
95 static u8 regOn; /* output to base port to access registers */
96 static u8 regOff; /* output to base port to close registers */
97
98 /*------------------------------------------------------------------------*/
99
100 /*
101 * Read a controller register.
102 */
inReg(u8 reg)103 static inline u8 inReg (u8 reg)
104 {
105 outb_p(reg, regPort);
106 return inb(dataPort);
107 }
108
109 /*
110 * Write a controller register.
111 */
outReg(u8 data,u8 reg)112 static void outReg (u8 data, u8 reg)
113 {
114 outb_p(reg, regPort);
115 outb_p(data, dataPort);
116 }
117
118 /*
119 * Set PIO mode for the specified drive.
120 * This function computes timing parameters
121 * and sets controller registers accordingly.
122 */
ali14xx_tune_drive(ide_drive_t * drive,u8 pio)123 static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
124 {
125 int driveNum;
126 int time1, time2;
127 u8 param1, param2, param3, param4;
128 unsigned long flags;
129 ide_pio_data_t d;
130 int bus_speed = system_bus_clock();
131
132 pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
133
134 /* calculate timing, according to PIO mode */
135 time1 = d.cycle_time;
136 time2 = ide_pio_timings[pio].active_time;
137 param3 = param1 = (time2 * bus_speed + 999) / 1000;
138 param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
139 if (pio < 3) {
140 param3 += 8;
141 param4 += 8;
142 }
143 printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
144 drive->name, pio, time1, time2, param1, param2, param3, param4);
145
146 /* stuff timing parameters into controller registers */
147 driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
148 spin_lock_irqsave(&io_request_lock, flags);
149 outb_p(regOn, basePort);
150 outReg(param1, regTab[driveNum].reg1);
151 outReg(param2, regTab[driveNum].reg2);
152 outReg(param3, regTab[driveNum].reg3);
153 outReg(param4, regTab[driveNum].reg4);
154 outb_p(regOff, basePort);
155 spin_unlock_irqrestore(&io_request_lock, flags);
156 }
157
158 /*
159 * Auto-detect the IDE controller port.
160 */
findPort(void)161 static int __init findPort (void)
162 {
163 int i;
164 u8 t;
165 unsigned long flags;
166
167 local_irq_save(flags);
168 for (i = 0; i < ALI_NUM_PORTS; ++i) {
169 basePort = ports[i];
170 regOff = inb(basePort);
171 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
172 outb_p(regOn, basePort);
173 if (inb(basePort) == regOn) {
174 regPort = basePort + 4;
175 dataPort = basePort + 8;
176 t = inReg(0) & 0xf0;
177 outb_p(regOff, basePort);
178 local_irq_restore(flags);
179 if (t != 0x50)
180 return 0;
181 return 1; /* success */
182 }
183 }
184 outb_p(regOff, basePort);
185 }
186 local_irq_restore(flags);
187 return 0;
188 }
189
190 /*
191 * Initialize controller registers with default values.
192 */
initRegisters(void)193 static int __init initRegisters (void) {
194 RegInitializer *p;
195 u8 t;
196 unsigned long flags;
197
198 local_irq_save(flags);
199 outb_p(regOn, basePort);
200 for (p = initData; p->reg != 0; ++p)
201 outReg(p->data, p->reg);
202 outb_p(0x01, regPort);
203 t = inb(regPort) & 0x01;
204 outb_p(regOff, basePort);
205 local_irq_restore(flags);
206 return t;
207 }
208
probe_ali14xx(void)209 int __init probe_ali14xx (void)
210 {
211 /* auto-detect IDE controller port */
212 if (!findPort()) {
213 printk(KERN_ERR "ali14xx: not found.\n");
214 return 1;
215 }
216
217 printk(KERN_DEBUG "ali14xx: base= 0x%03x, regOn = 0x%02x.\n", basePort, regOn);
218 ide_hwifs[0].chipset = ide_ali14xx;
219 ide_hwifs[1].chipset = ide_ali14xx;
220 ide_hwifs[0].tuneproc = &ali14xx_tune_drive;
221 ide_hwifs[1].tuneproc = &ali14xx_tune_drive;
222 ide_hwifs[0].mate = &ide_hwifs[1];
223 ide_hwifs[1].mate = &ide_hwifs[0];
224 ide_hwifs[1].channel = 1;
225
226 /* initialize controller registers */
227 if (!initRegisters()) {
228 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
229 return 1;
230 }
231
232 #ifndef HWIF_PROBE_CLASSIC_METHOD
233 probe_hwif_init(&ide_hwifs[0]);
234 probe_hwif_init(&ide_hwifs[1]);
235 #endif /* HWIF_PROBE_CLASSIC_METHOD */
236
237 return 0;
238 }
239
ali14xx_release(void)240 void __init ali14xx_release (void)
241 {
242 if (ide_hwifs[0].chipset != ide_ali14xx &&
243 ide_hwifs[1].chipset != ide_ali14xx)
244 return;
245
246 ide_hwifs[0].chipset = ide_unknown;
247 ide_hwifs[1].chipset = ide_unknown;
248 ide_hwifs[0].tuneproc = NULL;
249 ide_hwifs[1].tuneproc = NULL;
250 ide_hwifs[0].mate = NULL;
251 ide_hwifs[1].mate = NULL;
252 }
253
254 #ifndef MODULE
255 /*
256 * init_ali14xx:
257 *
258 * called by ide.c when parsing command line
259 */
260
init_ali14xx(void)261 void __init init_ali14xx (void)
262 {
263 /* auto-detect IDE controller port */
264 if (findPort())
265 if (probe_ali14xx())
266 goto no_detect;
267 return;
268
269 no_detect:
270 printk(KERN_ERR "ali14xx: not found.\n");
271 ali14xx_release();
272 }
273
274 #else
275
276 MODULE_AUTHOR("see local file");
277 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
278 MODULE_LICENSE("GPL");
279
ali14xx_mod_init(void)280 int __init ali14xx_mod_init(void)
281 {
282 /* auto-detect IDE controller port */
283 if (findPort())
284 if (probe_ali14xx()) {
285 ali14xx_release();
286 return -ENODEV;
287 }
288
289 if (ide_hwifs[0].chipset != ide_ali14xx &&
290 ide_hwifs[1].chipset != ide_ali14xx) {
291 ali14xx_release();
292 return -ENODEV;
293 }
294 return 0;
295 }
296 module_init(ali14xx_mod_init);
297
ali14xx_mod_exit(void)298 void __init ali14xx_mod_exit(void)
299 {
300 ali14xx_release();
301 }
302 module_exit(ali14xx_mod_exit);
303 #endif
304
305