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1da177e4 LT |
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 | |
59 | static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4}; | |
60 | ||
61 | /* register initialization data */ | |
62 | typedef struct { u8 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 { 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 | ||
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 u8 regOn; /* output to base port to access registers */ | |
88 | static u8 regOff; /* output to base port to close registers */ | |
89 | ||
90 | /*------------------------------------------------------------------------*/ | |
91 | ||
92 | /* | |
93 | * Read a controller register. | |
94 | */ | |
95 | static inline u8 inReg (u8 reg) | |
96 | { | |
97 | outb_p(reg, regPort); | |
98 | return inb(dataPort); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Write a controller register. | |
103 | */ | |
104 | static 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 | */ | |
115 | static 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 | */ | |
153 | static 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 | */ | |
185 | static 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 | ||
201 | static 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. */ | |
235 | int __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 | |
248 | module_init(ali14xx_init); | |
249 | #endif | |
250 | ||
251 | MODULE_AUTHOR("see local file"); | |
252 | MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets"); | |
253 | MODULE_LICENSE("GPL"); |