1 /*
2 * Copyright (C) 1996 Linus Torvalds & author (see below)
3 */
4
5 /*
6 * ALI M14xx chipset EIDE controller
7 *
8 * Works for ALI M1439/1443/1445/1487/1489 chipsets.
9 *
10 * Adapted from code developed by derekn@vw.ece.cmu.edu. -ml
11 * Derek's notes follow:
12 *
13 * I think the code should be pretty understandable,
14 * but I'll be happy to (try to) answer questions.
15 *
16 * The critical part is in the setupDrive function. The initRegisters
17 * function doesn't seem to be necessary, but the DOS driver does it, so
18 * I threw it in.
19 *
20 * I've only tested this on my system, which only has one disk. I posted
21 * it to comp.sys.linux.hardware, so maybe some other people will try it
22 * out.
23 *
24 * Derek Noonburg (derekn@ece.cmu.edu)
25 * 95-sep-26
26 *
27 * Update 96-jul-13:
28 *
29 * I've since upgraded to two disks and a CD-ROM, with no trouble, and
30 * I've also heard from several others who have used it successfully.
31 * This driver appears to work with both the 1443/1445 and the 1487/1489
32 * chipsets. I've added support for PIO mode 4 for the 1487. This
33 * seems to work just fine on the 1443 also, although I'm not sure it's
34 * advertised as supporting mode 4. (I've been running a WDC AC21200 in
35 * mode 4 for a while now with no trouble.) -Derek
36 */
37
38 #include <linux/module.h>
39 #include <linux/types.h>
40 #include <linux/kernel.h>
41 #include <linux/delay.h>
42 #include <linux/timer.h>
43 #include <linux/mm.h>
44 #include <linux/ioport.h>
45 #include <linux/blkdev.h>
46 #include <linux/ide.h>
47 #include <linux/init.h>
48
49 #include <asm/io.h>
50
51 #define DRV_NAME "ali14xx"
52
53 /* port addresses for auto-detection */
54 #define ALI_NUM_PORTS 4
55 static const int ports[ALI_NUM_PORTS] __initdata =
56 { 0x074, 0x0f4, 0x034, 0x0e4 };
57
58 /* register initialization data */
59 typedef struct { u8 reg, data; } RegInitializer;
60
61 static const RegInitializer initData[] __initdata = {
62 {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
63 {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
64 {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
65 {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
66 {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
67 {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
68 {0x35, 0x03}, {0x00, 0x00}
69 };
70
71 /* timing parameter registers for each drive */
72 static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
73 {0x03, 0x26, 0x04, 0x27}, /* drive 0 */
74 {0x05, 0x28, 0x06, 0x29}, /* drive 1 */
75 {0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */
76 {0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */
77 };
78
79 static int basePort; /* base port address */
80 static int regPort; /* port for register number */
81 static int dataPort; /* port for register data */
82 static u8 regOn; /* output to base port to access registers */
83 static u8 regOff; /* output to base port to close registers */
84
85 /*------------------------------------------------------------------------*/
86
87 /*
88 * Read a controller register.
89 */
inReg(u8 reg)90 static inline u8 inReg(u8 reg)
91 {
92 outb_p(reg, regPort);
93 return inb(dataPort);
94 }
95
96 /*
97 * Write a controller register.
98 */
outReg(u8 data,u8 reg)99 static void outReg(u8 data, u8 reg)
100 {
101 outb_p(reg, regPort);
102 outb_p(data, dataPort);
103 }
104
105 static DEFINE_SPINLOCK(ali14xx_lock);
106
107 /*
108 * Set PIO mode for the specified drive.
109 * This function computes timing parameters
110 * and sets controller registers accordingly.
111 */
ali14xx_set_pio_mode(ide_drive_t * drive,const u8 pio)112 static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
113 {
114 int driveNum;
115 int time1, time2;
116 u8 param1, param2, param3, param4;
117 unsigned long flags;
118 int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
119 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
120
121 /* calculate timing, according to PIO mode */
122 time1 = ide_pio_cycle_time(drive, pio);
123 time2 = t->active;
124 param3 = param1 = (time2 * bus_speed + 999) / 1000;
125 param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
126 if (pio < 3) {
127 param3 += 8;
128 param4 += 8;
129 }
130 printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
131 drive->name, pio, time1, time2, param1, param2, param3, param4);
132
133 /* stuff timing parameters into controller registers */
134 driveNum = (drive->hwif->index << 1) + (drive->dn & 1);
135 spin_lock_irqsave(&ali14xx_lock, flags);
136 outb_p(regOn, basePort);
137 outReg(param1, regTab[driveNum].reg1);
138 outReg(param2, regTab[driveNum].reg2);
139 outReg(param3, regTab[driveNum].reg3);
140 outReg(param4, regTab[driveNum].reg4);
141 outb_p(regOff, basePort);
142 spin_unlock_irqrestore(&ali14xx_lock, flags);
143 }
144
145 /*
146 * Auto-detect the IDE controller port.
147 */
findPort(void)148 static int __init findPort(void)
149 {
150 int i;
151 u8 t;
152 unsigned long flags;
153
154 local_irq_save(flags);
155 for (i = 0; i < ALI_NUM_PORTS; ++i) {
156 basePort = ports[i];
157 regOff = inb(basePort);
158 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
159 outb_p(regOn, basePort);
160 if (inb(basePort) == regOn) {
161 regPort = basePort + 4;
162 dataPort = basePort + 8;
163 t = inReg(0) & 0xf0;
164 outb_p(regOff, basePort);
165 local_irq_restore(flags);
166 if (t != 0x50)
167 return 0;
168 return 1; /* success */
169 }
170 }
171 outb_p(regOff, basePort);
172 }
173 local_irq_restore(flags);
174 return 0;
175 }
176
177 /*
178 * Initialize controller registers with default values.
179 */
initRegisters(void)180 static int __init initRegisters(void)
181 {
182 const RegInitializer *p;
183 u8 t;
184 unsigned long flags;
185
186 local_irq_save(flags);
187 outb_p(regOn, basePort);
188 for (p = initData; p->reg != 0; ++p)
189 outReg(p->data, p->reg);
190 outb_p(0x01, regPort);
191 t = inb(regPort) & 0x01;
192 outb_p(regOff, basePort);
193 local_irq_restore(flags);
194 return t;
195 }
196
197 static const struct ide_port_ops ali14xx_port_ops = {
198 .set_pio_mode = ali14xx_set_pio_mode,
199 };
200
201 static const struct ide_port_info ali14xx_port_info = {
202 .name = DRV_NAME,
203 .chipset = ide_ali14xx,
204 .port_ops = &ali14xx_port_ops,
205 .host_flags = IDE_HFLAG_NO_DMA,
206 .pio_mask = ATA_PIO4,
207 };
208
ali14xx_probe(void)209 static int __init ali14xx_probe(void)
210 {
211 printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
212 basePort, regOn);
213
214 /* initialize controller registers */
215 if (!initRegisters()) {
216 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
217 return 1;
218 }
219
220 return ide_legacy_device_add(&ali14xx_port_info, 0);
221 }
222
223 static int probe_ali14xx;
224
225 module_param_named(probe, probe_ali14xx, bool, 0);
226 MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
227
ali14xx_init(void)228 static int __init ali14xx_init(void)
229 {
230 if (probe_ali14xx == 0)
231 goto out;
232
233 /* auto-detect IDE controller port */
234 if (findPort()) {
235 if (ali14xx_probe())
236 return -ENODEV;
237 return 0;
238 }
239 printk(KERN_ERR "ali14xx: not found.\n");
240 out:
241 return -ENODEV;
242 }
243
244 module_init(ali14xx_init);
245
246 MODULE_AUTHOR("see local file");
247 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
248 MODULE_LICENSE("GPL");
249