2 * Copyright (C) 1995-2000 Linus Torvalds & author (see below)
6 * HT-6560B EIDE-controller support
7 * To activate controller support use kernel parameter "ide0=ht6560b".
8 * Use hdparm utility to enable PIO mode support.
10 * Author: Mikko Ala-Fossi <maf@iki.fi>
11 * Jan Evert van Grootheest <j.e.van.grootheest@caiway.nl>
13 * Try: http://www.maf.iki.fi/~maf/ht6560b/
16 #define DRV_NAME "ht6560b"
17 #define HT6560B_VERSION "v0.08"
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/timer.h>
25 #include <linux/ioport.h>
26 #include <linux/blkdev.h>
27 #include <linux/ide.h>
28 #include <linux/init.h>
32 /* #define DEBUG */ /* remove comments for DEBUG messages */
35 * The special i/o-port that HT-6560B uses to configuration:
36 * bit0 (0x01): "1" selects secondary interface
37 * bit2 (0x04): "1" enables FIFO function
38 * bit5 (0x20): "1" enables prefetched data read function (???)
40 * The special i/o-port that HT-6560A uses to configuration:
41 * bit0 (0x01): "1" selects secondary interface
42 * bit1 (0x02): "1" enables prefetched data read function
43 * bit2 (0x04): "0" enables multi-master system (?)
44 * bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?)
46 #define HT_CONFIG_PORT 0x3e6
47 #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
49 * FIFO + PREFETCH (both a/b-model)
51 #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
52 /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
53 #define HT_SECONDARY_IF 0x01
54 #define HT_PREFETCH_MODE 0x20
57 * ht6560b Timing values:
59 * I reviewed some assembler source listings of htide drivers and found
60 * out how they setup those cycle time interfacing values, as they at Holtek
61 * call them. IDESETUP.COM that is supplied with the drivers figures out
62 * optimal values and fetches those values to drivers. I found out that
63 * they use Select register to fetch timings to the ide board right after
64 * interface switching. After that it was quite easy to add code to
67 * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
68 * for hda and hdc. But hdb needed higher values to work, so I guess
69 * that sometimes it is necessary to give higher value than IDESETUP
70 * gives. [see cmd640.c for an extreme example of this. -ml]
72 * Perhaps I should explain something about these timing values:
73 * The higher nibble of value is the Recovery Time (rt) and the lower nibble
74 * of the value is the Active Time (at). Minimum value 2 is the fastest and
75 * the maximum value 15 is the slowest. Default values should be 15 for both.
76 * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
77 * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
78 * similar. If value is too small there will be all sorts of failures.
80 * Timing byte consists of
81 * High nibble: Recovery Cycle Time (rt)
82 * The valid values range from 2 to 15. The default is 15.
84 * Low nibble: Active Cycle Time (at)
85 * The valid values range from 2 to 15. The default is 15.
87 * You can obtain optimized timing values by running Holtek IDESETUP.COM
88 * for DOS. DOS drivers get their timing values from command line, where
89 * the first value is the Recovery Time and the second value is the
90 * Active Time for each drive. Smaller value gives higher speed.
91 * In case of failures you should probably fall back to a higher value.
93 #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
94 #define HT_TIMING_DEFAULT 0xff
97 * This routine handles interface switching for the peculiar hardware design
98 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
99 * The HT-6560B can only enable one IDE port at a time, and requires a
100 * silly sequence (below) whenever we switch between primary and secondary.
104 * This routine is invoked from ide.c to prepare for access to a given drive.
106 static void ht6560b_dev_select(ide_drive_t *drive)
108 ide_hwif_t *hwif = drive->hwif;
110 static u8 current_select = 0;
111 static u8 current_timing = 0;
114 local_irq_save(flags);
116 select = HT_CONFIG(drive);
117 timing = HT_TIMING(drive);
120 * Need to enforce prefetch sometimes because otherwise
123 if (drive->media != ide_disk ||
124 (drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
125 select |= HT_PREFETCH_MODE;
127 if (select != current_select || timing != current_timing) {
128 current_select = select;
129 current_timing = timing;
130 (void)inb(HT_CONFIG_PORT);
131 (void)inb(HT_CONFIG_PORT);
132 (void)inb(HT_CONFIG_PORT);
133 (void)inb(HT_CONFIG_PORT);
134 outb(select, HT_CONFIG_PORT);
136 * Set timing for this drive:
138 outb(timing, hwif->io_ports.device_addr);
139 (void)inb(hwif->io_ports.status_addr);
141 printk("ht6560b: %s: select=%#x timing=%#x\n",
142 drive->name, select, timing);
145 local_irq_restore(flags);
147 outb(drive->select | ATA_DEVICE_OBS, hwif->io_ports.device_addr);
151 * Autodetection and initialization of ht6560b
153 static int __init try_to_init_ht6560b(void)
158 /* Autodetect ht6560b */
159 if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
163 outb(0x00, HT_CONFIG_PORT);
164 if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
165 outb(orig_value, HT_CONFIG_PORT);
169 outb(0x00, HT_CONFIG_PORT);
170 if ((~inb(HT_CONFIG_PORT))& 0x3f) {
171 outb(orig_value, HT_CONFIG_PORT);
175 * Ht6560b autodetected
177 outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
178 outb(HT_TIMING_DEFAULT, 0x1f6); /* Select register */
179 (void)inb(0x1f7); /* Status register */
181 printk("ht6560b " HT6560B_VERSION
182 ": chipset detected and initialized"
184 " with debug enabled"
191 static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
193 int active_time, recovery_time;
194 int active_cycles, recovery_cycles;
195 int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
198 unsigned int cycle_time;
199 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
201 cycle_time = ide_pio_cycle_time(drive, pio);
204 * Just like opti621.c we try to calculate the
205 * actual cycle time for recovery and activity
206 * according system bus speed.
208 active_time = t->active;
209 recovery_time = cycle_time - active_time - t->setup;
211 * Cycle times should be Vesa bus cycles
213 active_cycles = (active_time * bus_speed + 999) / 1000;
214 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
216 * Upper and lower limits
218 if (active_cycles < 2) active_cycles = 2;
219 if (recovery_cycles < 2) recovery_cycles = 2;
220 if (active_cycles > 15) active_cycles = 15;
221 if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */
224 printk("ht6560b: drive %s setting pio=%d recovery=%d (%dns) active=%d (%dns)\n", drive->name, pio, recovery_cycles, recovery_time, active_cycles, active_time);
227 return (u8)((recovery_cycles << 4) | active_cycles);
231 printk("ht6560b: drive %s setting pio=0\n", drive->name);
234 return HT_TIMING_DEFAULT; /* default setting */
238 static DEFINE_SPINLOCK(ht6560b_lock);
241 * Enable/Disable so called prefetch mode
243 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
246 int t = HT_PREFETCH_MODE << 8;
248 spin_lock_irqsave(&ht6560b_lock, flags);
251 * Prefetch mode and unmask irq seems to conflict
254 drive->drive_data |= t; /* enable prefetch mode */
255 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
256 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
258 drive->drive_data &= ~t; /* disable prefetch mode */
259 drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
262 spin_unlock_irqrestore(&ht6560b_lock, flags);
265 printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
269 static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
275 case 8: /* set prefetch off */
276 case 9: /* set prefetch on */
277 ht_set_prefetch(drive, pio & 1);
281 timing = ht_pio2timings(drive, pio);
283 spin_lock_irqsave(&ht6560b_lock, flags);
284 drive->drive_data &= 0xff00;
285 drive->drive_data |= timing;
286 spin_unlock_irqrestore(&ht6560b_lock, flags);
289 printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
293 static void __init ht6560b_init_dev(ide_drive_t *drive)
295 ide_hwif_t *hwif = drive->hwif;
296 /* Setting default configurations for drives. */
297 int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
300 t |= (HT_SECONDARY_IF << 8);
302 drive->drive_data = t;
305 static int probe_ht6560b;
307 module_param_named(probe, probe_ht6560b, bool, 0);
308 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
310 static const struct ide_tp_ops ht6560b_tp_ops = {
311 .exec_command = ide_exec_command,
312 .read_status = ide_read_status,
313 .read_altstatus = ide_read_altstatus,
314 .write_devctl = ide_write_devctl,
316 .dev_select = ht6560b_dev_select,
317 .tf_load = ide_tf_load,
318 .tf_read = ide_tf_read,
320 .input_data = ide_input_data,
321 .output_data = ide_output_data,
324 static const struct ide_port_ops ht6560b_port_ops = {
325 .init_dev = ht6560b_init_dev,
326 .set_pio_mode = ht6560b_set_pio_mode,
329 static const struct ide_port_info ht6560b_port_info __initdata = {
331 .chipset = ide_ht6560b,
332 .tp_ops = &ht6560b_tp_ops,
333 .port_ops = &ht6560b_port_ops,
334 .host_flags = IDE_HFLAG_SERIALIZE | /* is this needed? */
336 IDE_HFLAG_ABUSE_PREFETCH,
337 .pio_mask = ATA_PIO4,
340 static int __init ht6560b_init(void)
342 if (probe_ht6560b == 0)
345 if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
346 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
351 if (!try_to_init_ht6560b()) {
352 printk(KERN_NOTICE "%s: HBA not found\n", __func__);
356 return ide_legacy_device_add(&ht6560b_port_info, 0);
359 release_region(HT_CONFIG_PORT, 1);
363 module_init(ht6560b_init);
365 MODULE_AUTHOR("See Local File");
366 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
367 MODULE_LICENSE("GPL");