arch/mips/lib/delay.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 by Waldorf Electronics
 * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2007  Maciej W. Rozycki
 */
#include <linux/module.h>
#include <linux/param.h>
#include <linux/smp.h>

#include <asm/compiler.h>
#include <asm/war.h>

inline void __delay(unsigned int loops)
{
	__asm__ __volatile__ (
	"	.set	noreorder				\n"
	"	.align	3					\n"
	"1:	bnez	%0, 1b					\n"
	"	subu	%0, 1					\n"
	"	.set	reorder					\n"
	: "=r" (loops)
	: "0" (loops));
}
EXPORT_SYMBOL(__delay);

/*
 * Division by multiplication: you don't have to worry about
 * loss of precision.
 *
 * Use only for very small delays ( < 1 msec).  Should probably use a
 * lookup table, really, as the multiplications take much too long with
 * short delays.  This is a "reasonable" implementation, though (and the
 * first constant multiplications gets optimized away if the delay is
 * a constant)
 */

void __udelay(unsigned long us)
{
	unsigned int lpj = raw_current_cpu_data.udelay_val;

	__delay((us * 0x000010c7ull * HZ * lpj) >> 32);
}
EXPORT_SYMBOL(__udelay);

void __ndelay(unsigned long ns)
{
	unsigned int lpj = raw_current_cpu_data.udelay_val;

	__delay((ns * 0x00000005ull * HZ * lpj) >> 32);
}
EXPORT_SYMBOL(__ndelay);
/*
 *	TURBOchannel bus services.
 *
 *	Copyright (c) Harald Koerfgen, 1998
 *	Copyright (c) 2001, 2003, 2005, 2006  Maciej W. Rozycki
 *	Copyright (c) 2005  James Simmons
 *
 *	This file is subject to the terms and conditions of the GNU
 *	General Public License.  See the file "COPYING" in the main
 *	directory of this archive for more details.
 */
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tc.h>
#include <linux/types.h>

#include <asm/io.h>

static struct tc_bus tc_bus = {
	.name = "TURBOchannel",
};

/*
 * Probing for TURBOchannel modules.
 */
static void __init tc_bus_add_devices(struct tc_bus *tbus)
{
	resource_size_t slotsize = tbus->info.slot_size << 20;
	resource_size_t extslotsize = tbus->ext_slot_size;
	resource_size_t slotaddr;
	resource_size_t extslotaddr;
	resource_size_t devsize;
	void __iomem *module;
	struct tc_dev *tdev;
	int i, slot, err;
	u8 pattern[4];
	long offset;

	for (slot = 0; slot < tbus->num_tcslots; slot++) {
		slotaddr = tbus->slot_base + slot * slotsize;
		extslotaddr = tbus->ext_slot_base + slot * extslotsize;
		module = ioremap_nocache(slotaddr, slotsize);
		BUG_ON(!module);

		offset = TC_OLDCARD;

		err = 0;
		err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0);
		err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1);
		err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2);
		err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3);
		if (err)
			goto out_err;

		if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
		    pattern[2] != 0xaa || pattern[3] != 0xff) {
			offset = TC_NEWCARD;

			err = 0;
			err |= tc_preadb(pattern + 0,
					 module + offset + TC_PATTERN0);
			err |= tc_preadb(pattern + 1,
					 module + offset + TC_PATTERN1);
			err |= tc_preadb(pattern + 2,
					 module + offset + TC_PATTERN2);
			err |= tc_preadb(pattern + 3,
					 module + offset + TC_PATTERN3);
			if (err)
				goto out_err;
		}

		if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
		    pattern[2] != 0xaa || pattern[3] != 0xff)
			goto out_err;

		/* Found a board, allocate it an entry in the list */
		tdev = kzalloc(sizeof(*tdev), GFP_KERNEL);
		if (!tdev) {
			printk(KERN_ERR "tc%x: unable to allocate tc_dev\n",
			       slot);
			goto out_err;
		}
		dev_set_name(&tdev->dev, "tc%x", slot);
		tdev->bus = tbus;
		tdev->dev.parent = &tbus->dev;
		tdev->dev.bus = &tc_bus_type;
		tdev->slot = slot;

		for (i = 0; i < 8; i++) {
			tdev->firmware[i] =
				readb(module + offset + TC_FIRM_VER + 4 * i);
			tdev->vendor[i] =
				readb(module + offset + TC_VENDOR + 4 * i);
			tdev->name[i] =
				readb(module + offset + TC_MODULE + 4 * i);
		}
		tdev->firmware[8] = 0;
		tdev->vendor[8] = 0;
		tdev->name[8] = 0;

		pr_info("%s: %s %s %s\n", dev_name(&tdev->dev), tdev->vendor,
			tdev->name, tdev->firmware);

		devsize = readb(module + offset + TC_SLOT_SIZE);
		devsize <<= 22;
		if (devsize <= slotsize) {
			tdev->resource.start = slotaddr;
			tdev->resource.end = slotaddr + devsize - 1;
		} else if (devsize <= extslotsize) {
			tdev->resource.start = extslotaddr;
			tdev->resource.end = extslotaddr + devsize - 1;
		} else {
			printk(KERN_ERR "%s: Cannot provide slot space "
			       "(%dMiB required, up to %dMiB supported)\n",
			       dev_name(&tdev->dev), devsize >> 20,
			       max(slotsize, extslotsize) >> 20);
			kfree(tdev);
			goto out_err;
		}
		tdev->resource.name = tdev->name;
		tdev->resource.flags = IORESOURCE_MEM;

		tc_device_get_irq(tdev);

		device_register(&tdev->dev);
		list_add_tail(&tdev->node, &tbus->devices);

out_err:
		iounmap(module);
	}
}

/*
 * The main entry.
 */
static int __init tc_init(void)
{
	/* Initialize the TURBOchannel bus */
	if (tc_bus_get_info(&tc_bus))
		return 0;

	INIT_LIST_HEAD(&tc_bus.devices);
	dev_set_name(&tc_bus.dev, "tc");
	device_register(&tc_bus.dev);

	if (tc_bus.info.slot_size) {
		unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000;

		pr_info("tc: TURBOchannel rev. %d at %d.%d MHz "
			"(with%s parity)\n", tc_bus.info.revision,
			tc_clock / 10, tc_clock % 10,
			tc_bus.info.parity ? "" : "out");

		tc_bus.resource[0].start = tc_bus.slot_base;
		tc_bus.resource[0].end = tc_bus.slot_base +
					 (tc_bus.info.slot_size << 20) *
					 tc_bus.num_tcslots - 1;
		tc_bus.resource[0].name = tc_bus.name;
		tc_bus.resource[0].flags = IORESOURCE_MEM;
		if (request_resource(&iomem_resource,
				     &tc_bus.resource[0]) < 0) {
			printk(KERN_ERR "tc: Cannot reserve resource\n");
			return 0;
		}
		if (tc_bus.ext_slot_size) {
			tc_bus.resource[1].start = tc_bus.ext_slot_base;
			tc_bus.resource[1].end = tc_bus.ext_slot_base +
						 tc_bus.ext_slot_size *
						 tc_bus.num_tcslots - 1;
			tc_bus.resource[1].name = tc_bus.name;
			tc_bus.resource[1].flags = IORESOURCE_MEM;
			if (request_resource(&iomem_resource,
					     &tc_bus.resource[1]) < 0) {
				printk(KERN_ERR
				       "tc: Cannot reserve resource\n");
				release_resource(&tc_bus.resource[0]);
				return 0;
			}
		}

		tc_bus_add_devices(&tc_bus);
	}

	return 0;
}

subsys_initcall(tc_init);