2 * linux/drivers/ide/legacy/ali14xx.c Version 0.03 Feb 09, 1996
4 * Copyright (C) 1996 Linus Torvalds & author (see below)
8 * ALI M14xx chipset EIDE controller
10 * Works for ALI M1439/1443/1445/1487/1489 chipsets.
12 * Adapted from code developed by derekn@vw.ece.cmu.edu. -ml
13 * Derek's notes follow:
15 * I think the code should be pretty understandable,
16 * but I'll be happy to (try to) answer questions.
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
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
26 * Derek Noonburg (derekn@ece.cmu.edu)
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
40 #undef REALLY_SLOW_IO /* most systems can safely undef this */
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>
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>
57 #ifdef CONFIG_BLK_DEV_ALI14XX_MODULE
59 # include "ide_modes.h"
62 # include "ide_modes.h"
63 #endif /* CONFIG_BLK_DEV_ALI14XX_MODULE */
65 /* port addresses for auto-detection */
66 #define ALI_NUM_PORTS 4
67 static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
69 /* register initialization data */
70 typedef struct { u8 reg, data; } RegInitializer;
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}
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 */
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 */
98 /*------------------------------------------------------------------------*/
101 * Read a controller register.
103 static inline u8 inReg (u8 reg)
105 outb_p(reg, regPort);
106 return inb(dataPort);
110 * Write a controller register.
112 static void outReg (u8 data, u8 reg)
114 outb_p(reg, regPort);
115 outb_p(data, dataPort);
119 * Set PIO mode for the specified drive.
120 * This function computes timing parameters
121 * and sets controller registers accordingly.
123 static void ali14xx_tune_drive (ide_drive_t *drive, u8 pio)
127 u8 param1, param2, param3, param4;
130 int bus_speed = system_bus_clock();
132 pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
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;
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);
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);
159 * Auto-detect the IDE controller port.
161 static int __init findPort (void)
167 local_irq_save(flags);
168 for (i = 0; i < ALI_NUM_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;
177 outb_p(regOff, basePort);
178 local_irq_restore(flags);
181 return 1; /* success */
184 outb_p(regOff, basePort);
186 local_irq_restore(flags);
191 * Initialize controller registers with default values.
193 static int __init initRegisters (void) {
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);
209 int __init probe_ali14xx (void)
211 /* auto-detect IDE controller port */
213 printk(KERN_ERR "ali14xx: not found.\n");
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;
226 /* initialize controller registers */
227 if (!initRegisters()) {
228 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
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 */
240 void __init ali14xx_release (void)
242 if (ide_hwifs[0].chipset != ide_ali14xx &&
243 ide_hwifs[1].chipset != ide_ali14xx)
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;
258 * called by ide.c when parsing command line
261 void __init init_ali14xx (void)
263 /* auto-detect IDE controller port */
270 printk(KERN_ERR "ali14xx: not found.\n");
276 MODULE_AUTHOR("see local file");
277 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
278 MODULE_LICENSE("GPL");
280 int __init ali14xx_mod_init(void)
282 /* auto-detect IDE controller port */
284 if (probe_ali14xx()) {
289 if (ide_hwifs[0].chipset != ide_ali14xx &&
290 ide_hwifs[1].chipset != ide_ali14xx) {
296 module_init(ali14xx_mod_init);
298 void __init ali14xx_mod_exit(void)
302 module_exit(ali14xx_mod_exit);