From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/sparc/kernel/devices.c | 160 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100644 arch/sparc/kernel/devices.c (limited to 'arch/sparc/kernel/devices.c') diff --git a/arch/sparc/kernel/devices.c b/arch/sparc/kernel/devices.c new file mode 100644 index 000000000000..fcb0c049c3fe --- /dev/null +++ b/arch/sparc/kernel/devices.c @@ -0,0 +1,160 @@ +/* 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 +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +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) +{ + char node_str[128]; + + prom_getstring(nd, "device_type", node_str, sizeof(node_str)); + if (strcmp(node_str, "cpu")) + return -ENODEV; + + 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) +{ + int nd, cur_inst, err; + + nd = prom_root_node; + cur_inst = 0; + + err = check_cpu_node(nd, &cur_inst, compare, compare_arg, + prom_node, mid); + if (!err) + return 0; + + nd = prom_getchild(nd); + while ((nd = prom_getsibling(nd)) != 0) { + err = check_cpu_node(nd, &cur_inst, compare, compare_arg, + prom_node, mid); + if (!err) + 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(); +#ifdef CONFIG_SUN_AUXIO + { + extern void auxio_probe(void); + extern void auxio_power_probe(void); + auxio_probe(); + auxio_power_probe(); + } +#endif + clock_stop_probe(); + + if (ARCH_SUN4C_SUN4) + sun4c_probe_memerr_reg(); + + return; +} -- cgit v1.2.2