1// SPDX-License-Identifier: GPL-2.0
  2/* devices.c: Initial scan of the prom device tree for important
  3 *	      Sparc device nodes which we need to find.
  4 *
  5 * This is based on the sparc64 version, but sun4m doesn't always use
  6 * the hardware MIDs, so be careful.
  7 *
  8 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  9 */
 10
 11#include <linux/kernel.h>
 12#include <linux/threads.h>
 13#include <linux/string.h>
 14#include <linux/init.h>
 15#include <linux/errno.h>
 16
 17#include <asm/page.h>
 18#include <asm/oplib.h>
 19#include <asm/prom.h>
 20#include <asm/smp.h>
 
 21#include <asm/cpudata.h>
 22#include <asm/cpu_type.h>
 23#include <asm/setup.h>
 24
 25#include "kernel.h"
 
 26
 27static char *cpu_mid_prop(void)
 28{
 29	if (sparc_cpu_model == sun4d)
 30		return "cpu-id";
 31	return "mid";
 32}
 33
 34static int check_cpu_node(phandle nd, int *cur_inst,
 35		int (*compare)(phandle, int, void *), void *compare_arg,
 36		phandle *prom_node, int *mid)
 37{
 38	if (!compare(nd, *cur_inst, compare_arg)) {
 39		if (prom_node)
 40			*prom_node = nd;
 41		if (mid) {
 42			*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
 43			if (sparc_cpu_model == sun4m)
 44				*mid &= 3;
 45		}
 46		return 0;
 47	}
 48
 49	(*cur_inst)++;
 50
 51	return -ENODEV;
 52}
 53
 54static int __cpu_find_by(int (*compare)(phandle, int, void *),
 55		void *compare_arg, phandle *prom_node, int *mid)
 56{
 57	struct device_node *dp;
 58	int cur_inst;
 59
 60	cur_inst = 0;
 61	for_each_node_by_type(dp, "cpu") {
 62		int err = check_cpu_node(dp->phandle, &cur_inst,
 63					 compare, compare_arg,
 64					 prom_node, mid);
 65		if (!err) {
 66			of_node_put(dp);
 67			return 0;
 68		}
 69	}
 70
 71	return -ENODEV;
 72}
 73
 74static int cpu_instance_compare(phandle nd, int instance, void *_arg)
 75{
 76	int desired_instance = (int) _arg;
 77
 78	if (instance == desired_instance)
 79		return 0;
 80	return -ENODEV;
 81}
 82
 83int cpu_find_by_instance(int instance, phandle *prom_node, int *mid)
 84{
 85	return __cpu_find_by(cpu_instance_compare, (void *)instance,
 86			     prom_node, mid);
 87}
 88
 89static int cpu_mid_compare(phandle nd, int instance, void *_arg)
 90{
 91	int desired_mid = (int) _arg;
 92	int this_mid;
 93
 94	this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
 95	if (this_mid == desired_mid
 96	    || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid))
 97		return 0;
 98	return -ENODEV;
 99}
100
101int cpu_find_by_mid(int mid, phandle *prom_node)
102{
103	return __cpu_find_by(cpu_mid_compare, (void *)mid,
104			     prom_node, NULL);
105}
106
107/* sun4m uses truncated mids since we base the cpuid on the ttable/irqset
108 * address (0-3).  This gives us the true hardware mid, which might have
109 * some other bits set.  On 4d hardware and software mids are the same.
110 */
111int cpu_get_hwmid(phandle prom_node)
112{
113	return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
114}
115
116void __init device_scan(void)
117{
118	printk(KERN_NOTICE "Booting Linux...\n");
119
120#ifndef CONFIG_SMP
121	{
122		phandle cpu_node;
123		int err;
124		err = cpu_find_by_instance(0, &cpu_node, NULL);
125		if (err) {
126			/* Probably a sun4e, Sun is trying to trick us ;-) */
127			prom_printf("No cpu nodes, cannot continue\n");
128			prom_halt();
129		}
130		cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
131							    "clock-frequency",
132							    0);
133	}
134#endif /* !CONFIG_SMP */
135
136	auxio_probe();
137	auxio_power_probe();
 
 
 
 
 
 
 
 
138}

 
  1/* devices.c: Initial scan of the prom device tree for important
  2 *	      Sparc device nodes which we need to find.
  3 *
  4 * This is based on the sparc64 version, but sun4m doesn't always use
  5 * the hardware MIDs, so be careful.
  6 *
  7 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/threads.h>
 12#include <linux/string.h>
 13#include <linux/init.h>
 14#include <linux/errno.h>
 15
 16#include <asm/page.h>
 17#include <asm/oplib.h>
 18#include <asm/prom.h>
 19#include <asm/smp.h>
 20#include <asm/system.h>
 21#include <asm/cpudata.h>
 
 
 22
 23extern void clock_stop_probe(void); /* tadpole.c */
 24extern void sun4c_probe_memerr_reg(void);
 25
 26static char *cpu_mid_prop(void)
 27{
 28	if (sparc_cpu_model == sun4d)
 29		return "cpu-id";
 30	return "mid";
 31}
 32
 33static int check_cpu_node(phandle nd, int *cur_inst,
 34		int (*compare)(phandle, int, void *), void *compare_arg,
 35		phandle *prom_node, int *mid)
 36{
 37	if (!compare(nd, *cur_inst, compare_arg)) {
 38		if (prom_node)
 39			*prom_node = nd;
 40		if (mid) {
 41			*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
 42			if (sparc_cpu_model == sun4m)
 43				*mid &= 3;
 44		}
 45		return 0;
 46	}
 47
 48	(*cur_inst)++;
 49
 50	return -ENODEV;
 51}
 52
 53static int __cpu_find_by(int (*compare)(phandle, int, void *),
 54		void *compare_arg, phandle *prom_node, int *mid)
 55{
 56	struct device_node *dp;
 57	int cur_inst;
 58
 59	cur_inst = 0;
 60	for_each_node_by_type(dp, "cpu") {
 61		int err = check_cpu_node(dp->phandle, &cur_inst,
 62					 compare, compare_arg,
 63					 prom_node, mid);
 64		if (!err) {
 65			of_node_put(dp);
 66			return 0;
 67		}
 68	}
 69
 70	return -ENODEV;
 71}
 72
 73static int cpu_instance_compare(phandle nd, int instance, void *_arg)
 74{
 75	int desired_instance = (int) _arg;
 76
 77	if (instance == desired_instance)
 78		return 0;
 79	return -ENODEV;
 80}
 81
 82int cpu_find_by_instance(int instance, phandle *prom_node, int *mid)
 83{
 84	return __cpu_find_by(cpu_instance_compare, (void *)instance,
 85			     prom_node, mid);
 86}
 87
 88static int cpu_mid_compare(phandle nd, int instance, void *_arg)
 89{
 90	int desired_mid = (int) _arg;
 91	int this_mid;
 92
 93	this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
 94	if (this_mid == desired_mid
 95	    || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid))
 96		return 0;
 97	return -ENODEV;
 98}
 99
100int cpu_find_by_mid(int mid, phandle *prom_node)
101{
102	return __cpu_find_by(cpu_mid_compare, (void *)mid,
103			     prom_node, NULL);
104}
105
106/* sun4m uses truncated mids since we base the cpuid on the ttable/irqset
107 * address (0-3).  This gives us the true hardware mid, which might have
108 * some other bits set.  On 4d hardware and software mids are the same.
109 */
110int cpu_get_hwmid(phandle prom_node)
111{
112	return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
113}
114
115void __init device_scan(void)
116{
117	printk(KERN_NOTICE "Booting Linux...\n");
118
119#ifndef CONFIG_SMP
120	{
121		phandle cpu_node;
122		int err;
123		err = cpu_find_by_instance(0, &cpu_node, NULL);
124		if (err) {
125			/* Probably a sun4e, Sun is trying to trick us ;-) */
126			prom_printf("No cpu nodes, cannot continue\n");
127			prom_halt();
128		}
129		cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
130							    "clock-frequency",
131							    0);
132	}
133#endif /* !CONFIG_SMP */
134
135	{
136		extern void auxio_probe(void);
137		extern void auxio_power_probe(void);
138		auxio_probe();
139		auxio_power_probe();
140	}
141	clock_stop_probe();
142
143	if (ARCH_SUN4C)
144		sun4c_probe_memerr_reg();
145}