[deliverable/linux.git] / arch / sparc / kernel / devices.c

/* 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/system.h>
#include <asm/cpudata.h>

extern void cpu_probe(void);
extern void clock_stop_probe(void); /* tadpole.c */
extern void sun4c_probe_memerr_reg(void);

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

static int check_cpu_node(int nd, int *cur_inst,
			  int (*compare)(int, int, void *), void *compare_arg,
			  int *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;
}

static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
			 int *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;
}

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

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

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

static int cpu_mid_compare(int 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;
}

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

/* 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(int prom_node)
{
	return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
}

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

#ifndef CONFIG_SMP
	{
		int err, cpu_node;
		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 */

	cpu_probe();
	{
		extern void auxio_probe(void);
		extern void auxio_power_probe(void);
		auxio_probe();
		auxio_power_probe();
	}
	clock_stop_probe();

	if (ARCH_SUN4C)
		sun4c_probe_memerr_reg();
}
Commit	Line	Data
1da177e4 LT	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
1da177e4 LT	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>
c2d3bffe	18	#include <asm/prom.h>
1da177e4 LT	19	#include <asm/smp.h>
	20	#include <asm/system.h>
	21	#include <asm/cpudata.h>
	22
	23	extern void cpu_probe(void);
	24	extern void clock_stop_probe(void); /* tadpole.c */
	25	extern void sun4c_probe_memerr_reg(void);
	26
	27	static char *cpu_mid_prop(void)
	28	{
	29	if (sparc_cpu_model == sun4d)
	30	return "cpu-id";
	31	return "mid";
	32	}
	33
	34	static int check_cpu_node(int nd, int *cur_inst,
	35	int (compare)(int, int, void ), void *compare_arg,
	36	int prom_node, int mid)
	37	{
1da177e4 LT	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
	54	static int __cpu_find_by(int (compare)(int, int, void ), void *compare_arg,
	55	int prom_node, int mid)
	56	{
c2d3bffe DM	57	struct device_node *dp;
c2d3bffe DM	58	int cur_inst;
1da177e4	59
1da177e4	60	cur_inst = 0;
c2d3bffe	61	for_each_node_by_type(dp, "cpu") {
6016a363	62	int err = check_cpu_node(dp->phandle, &cur_inst,
c2d3bffe DM	63	compare, compare_arg,
c2d3bffe DM	64	prom_node, mid);
b127aa8b JL	65	if (!err) {
b127aa8b JL	66	of_node_put(dp);
1da177e4	67	return 0;
b127aa8b	68	}
1da177e4 LT	69	}
	70
	71	return -ENODEV;
	72	}
	73
	74	static int cpu_instance_compare(int 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
	83	int cpu_find_by_instance(int instance, int prom_node, int mid)
	84	{
	85	return __cpu_find_by(cpu_instance_compare, (void *)instance,
	86	prom_node, mid);
	87	}
	88
	89	static int cpu_mid_compare(int 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
	101	int cpu_find_by_mid(int mid, int *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	*/
	111	int cpu_get_hwmid(int prom_node)
	112	{
	113	return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
	114	}
	115
	116	void __init device_scan(void)
	117	{
	118	prom_printf("Booting Linux...\n");
	119
	120	#ifndef CONFIG_SMP
	121	{
	122	int err, cpu_node;
	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	cpu_probe();
1da177e4 LT	136	{
	137	extern void auxio_probe(void);
	138	extern void auxio_power_probe(void);
	139	auxio_probe();
	140	auxio_power_probe();
	141	}
1da177e4 LT	142	clock_stop_probe();
1da177e4 LT	143
5110bd21	144	if (ARCH_SUN4C)
1da177e4	145	sun4c_probe_memerr_reg();
1da177e4	146	}