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#include <linux/module.h>
41#include <linux/types.h>
42#include <linux/kernel.h>
43#include <linux/delay.h>
44#include <linux/timer.h>
45#include <linux/mm.h>
46#include <linux/ioport.h>
47#include <linux/blkdev.h>
48#include <linux/hdreg.h>
49#include <linux/ide.h>
50#include <linux/init.h>
51
52#include <asm/io.h>
53
54/* port addresses for auto-detection */
55#define ALI_NUM_PORTS 4
56static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
57
58/* register initialization data */
59typedef struct { u8 reg, data; } RegInitializer;
60
61static 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 */
72static 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
79static int basePort; /* base port address */
80static int regPort; /* port for register number */
81static int dataPort; /* port for register data */
82static u8 regOn; /* output to base port to access registers */
83static u8 regOff; /* output to base port to close registers */
84
85/*------------------------------------------------------------------------*/
86
87/*
88 * Read a controller register.
89 */
90static inline u8 inReg (u8 reg)
91{
92 outb_p(reg, regPort);
93 return inb(dataPort);
94}
95
96/*
97 * Write a controller register.
98 */
99static void outReg (u8 data, u8 reg)
100{
101 outb_p(reg, regPort);
102 outb_p(data, dataPort);
103}
104
105static 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 */
112static 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 = system_bus_clock();
119
120 /* calculate timing, according to PIO mode */
121 time1 = ide_pio_cycle_time(drive, pio);
122 time2 = ide_pio_timings[pio].active_time;
123 param3 = param1 = (time2 * bus_speed + 999) / 1000;
124 param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
125 if (pio < 3) {
126 param3 += 8;
127 param4 += 8;
128 }
129 printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
130 drive->name, pio, time1, time2, param1, param2, param3, param4);
131
132 /* stuff timing parameters into controller registers */
133 driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
134 spin_lock_irqsave(&ali14xx_lock, flags);
135 outb_p(regOn, basePort);
136 outReg(param1, regTab[driveNum].reg1);
137 outReg(param2, regTab[driveNum].reg2);
138 outReg(param3, regTab[driveNum].reg3);
139 outReg(param4, regTab[driveNum].reg4);
140 outb_p(regOff, basePort);
141 spin_unlock_irqrestore(&ali14xx_lock, flags);
142}
143
144/*
145 * Auto-detect the IDE controller port.
146 */
147static int __init findPort (void)
148{
149 int i;
150 u8 t;
151 unsigned long flags;
152
153 local_irq_save(flags);
154 for (i = 0; i < ALI_NUM_PORTS; ++i) {
155 basePort = ports[i];
156 regOff = inb(basePort);
157 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
158 outb_p(regOn, basePort);
159 if (inb(basePort) == regOn) {
160 regPort = basePort + 4;
161 dataPort = basePort + 8;
162 t = inReg(0) & 0xf0;
163 outb_p(regOff, basePort);
164 local_irq_restore(flags);
165 if (t != 0x50)
166 return 0;
167 return 1; /* success */
168 }
169 }
170 outb_p(regOff, basePort);
171 }
172 local_irq_restore(flags);
173 return 0;
174}
175
176/*
177 * Initialize controller registers with default values.
178 */
179static int __init initRegisters (void) {
180 RegInitializer *p;
181 u8 t;
182 unsigned long flags;
183
184 local_irq_save(flags);
185 outb_p(regOn, basePort);
186 for (p = initData; p->reg != 0; ++p)
187 outReg(p->data, p->reg);
188 outb_p(0x01, regPort);
189 t = inb(regPort) & 0x01;
190 outb_p(regOff, basePort);
191 local_irq_restore(flags);
192 return t;
193}
194
195static int __init ali14xx_probe(void)
196{
197 ide_hwif_t *hwif, *mate;
198 static u8 idx[4] = { 0, 1, 0xff, 0xff };
199
200 printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
201 basePort, regOn);
202
203 /* initialize controller registers */
204 if (!initRegisters()) {
205 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
206 return 1;
207 }
208
209 hwif = &ide_hwifs[0];
210 mate = &ide_hwifs[1];
211
212 hwif->chipset = ide_ali14xx;
213 hwif->pio_mask = ATA_PIO4;
214 hwif->set_pio_mode = &ali14xx_set_pio_mode;
215 hwif->mate = mate;
216
217 mate->chipset = ide_ali14xx;
218 mate->pio_mask = ATA_PIO4;
219 mate->set_pio_mode = &ali14xx_set_pio_mode;
220 mate->mate = hwif;
221 mate->channel = 1;
222
223 ide_device_add(idx);
224
225 return 0;
226}
227
228int probe_ali14xx = 0;
229
230module_param_named(probe, probe_ali14xx, bool, 0);
231MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
232
233/* Can be called directly from ide.c. */
234int __init ali14xx_init(void)
235{
236 if (probe_ali14xx == 0)
237 goto out;
238
239 /* auto-detect IDE controller port */
240 if (findPort()) {
241 if (ali14xx_probe())
242 return -ENODEV;
243 return 0;
244 }
245 printk(KERN_ERR "ali14xx: not found.\n");
246out:
247 return -ENODEV;
248}
249
250#ifdef MODULE
251module_init(ali14xx_init);
252#endif
253
254MODULE_AUTHOR("see local file");
255MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
256MODULE_LICENSE("GPL");