Release 4.14 arch/sparc/kernel/devices.c

// SPDX-License-Identifier: GPL-2.0
/* devices.c: Initial scan of the prom device tree for important
 *            Sparc device nodes which we need to find.
 *
 * This is based on the sparc64 version, but sun4m doesn't always use
 * the hardware MIDs, so be careful.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/errno.h>

#include <asm/page.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/smp.h>
#include <asm/cpudata.h>
#include <asm/cpu_type.h>
#include <asm/setup.h>

#include "kernel.h"



static char *cpu_mid_prop(void)
{
	if (sparc_cpu_model == sun4d)
		return "cpu-id";
	return "mid";
}

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static int check_cpu_node(phandle nd, int *cur_inst,
		int (*compare)(phandle, int, void *), void *compare_arg,
		phandle *prom_node, int *mid)
{
	if (!compare(nd, *cur_inst, compare_arg)) {
		if (prom_node)
			*prom_node = nd;
		if (mid) {
			*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
			if (sparc_cpu_model == sun4m)
				*mid &= 3;
		}
		return 0;
	}

	(*cur_inst)++;

	return -ENODEV;
}

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Keith M. Wesolowski
79
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Linus Torvalds (pre-git)
23
21.70%
2
40.00%
Andres Salomon
3
2.83%
1
20.00%
Rob Radez
1
0.94%
1
20.00%
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106
100.00%
5
100.00%



static int __cpu_find_by(int (*compare)(phandle, int, void *),
		void *compare_arg, phandle *prom_node, int *mid)
{
	struct device_node *dp;
	int cur_inst;

	cur_inst = 0;
	for_each_node_by_type(dp, "cpu") {
		int err = check_cpu_node(dp->phandle, &cur_inst,
					 compare, compare_arg,
					 prom_node, mid);
		if (!err) {
			of_node_put(dp);
			return 0;
		}
	}

	return -ENODEV;
}

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Keith M. Wesolowski
61
66.30%
1
12.50%
David S. Miller
13
14.13%
1
12.50%
Linus Torvalds (pre-git)
8
8.70%
3
37.50%
Julia Lawall
7
7.61%
1
12.50%
Andres Salomon
2
2.17%
1
12.50%
Grant C. Likely
1
1.09%
1
12.50%
Total
92
100.00%
8
100.00%



static int cpu_instance_compare(phandle nd, int instance, void *_arg)
{
	int desired_instance = (int) _arg;

	if (instance == desired_instance)
		return 0;
	return -ENODEV;
}

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32
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Linus Torvalds (pre-git)
4
10.81%
1
33.33%
Andres Salomon
1
2.70%
1
33.33%
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37
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3
100.00%



int cpu_find_by_instance(int instance, phandle *prom_node, int *mid)
{
	return __cpu_find_by(cpu_instance_compare, (void *)instance,
			     prom_node, mid);
}

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26
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Linus Torvalds (pre-git)
5
15.62%
1
33.33%
Andres Salomon
1
3.12%
1
33.33%
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32
100.00%
3
100.00%



static int cpu_mid_compare(phandle nd, int instance, void *_arg)
{
	int desired_mid = (int) _arg;
	int this_mid;

	this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
	if (this_mid == desired_mid
	    || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid))
		return 0;
	return -ENODEV;
}

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59
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33.33%
Linus Torvalds (pre-git)
6
9.09%
1
33.33%
Andres Salomon
1
1.52%
1
33.33%
Total
66
100.00%
3
100.00%



int cpu_find_by_mid(int mid, phandle *prom_node)
{
	return __cpu_find_by(cpu_mid_compare, (void *)mid,
			     prom_node, NULL);
}

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20
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33.33%
Linus Torvalds (pre-git)
7
25.00%
1
33.33%
Andres Salomon
1
3.57%
1
33.33%
Total
28
100.00%
3
100.00%

/* sun4m uses truncated mids since we base the cpuid on the ttable/irqset
 * address (0-3).  This gives us the true hardware mid, which might have
 * some other bits set.  On 4d hardware and software mids are the same.
 */


int cpu_get_hwmid(phandle prom_node)
{
	return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
}

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Linus Torvalds (pre-git)
2
10.00%
1
33.33%
Andres Salomon
1
5.00%
1
33.33%
Total
20
100.00%
3
100.00%



void __init device_scan(void)
{
	printk(KERN_NOTICE "Booting Linux...\n");

#ifndef CONFIG_SMP
	{
		phandle cpu_node;
		int err;
		err = cpu_find_by_instance(0, &cpu_node, NULL);
		if (err) {
			/* Probably a sun4e, Sun is trying to trick us ;-) */
			prom_printf("No cpu nodes, cannot continue\n");
			prom_halt();
		}
		cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
							    "clock-frequency",
							    0);
	}
#endif /* !CONFIG_SMP */

	auxio_probe();
	auxio_power_probe();
}
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Keith M. Wesolowski
41
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1
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Linus Torvalds (pre-git)
30
38.96%
3
42.86%
Andres Salomon
3
3.90%
1
14.29%
Sam Ravnborg
2
2.60%
1
14.29%
David S. Miller
1
1.30%
1
14.29%
Total
77
100.00%
7
100.00%

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Keith M. Wesolowski
362
69.48%
1
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Linus Torvalds (pre-git)
107
20.54%
8
38.10%
David S. Miller
17
3.26%
2
9.52%
Andres Salomon
13
2.50%
1
4.76%
Sam Ravnborg
8
1.54%
3
14.29%
Julia Lawall
7
1.34%
1
4.76%
Rob Radez
2
0.38%
1
4.76%
David Howells
2
0.38%
1
4.76%
Linus Torvalds
1
0.19%
1
4.76%
Grant C. Likely
1
0.19%
1
4.76%
Greg Kroah-Hartman
1
0.19%
1
4.76%
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21
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Directory: arch/sparc/kernel

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