| 1 | |
| 2 | |
| 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 ([email protected])
|
| 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 |
|
| 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(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 |
|
| 54 | static 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 |
|
| 74 | static 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 |
|
| 83 | int 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 |
|
| 89 | static 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 |
|
| 101 | int 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 | |
| 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(phandle prom_node)
|
| 112 | {
|
| 113 | return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
|
| 114 | }
|
| 115 |
|
| 116 | void __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 |
|
| 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
|
| 135 |
|
| 136 | auxio_probe();
|
| 137 | auxio_power_probe();
|
| 138 | }
|