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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc64/kernel/devices.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/sparc64/kernel/devices.c')
-rw-r--r-- | arch/sparc64/kernel/devices.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/devices.c b/arch/sparc64/kernel/devices.c new file mode 100644 index 000000000000..d710274e516b --- /dev/null +++ b/arch/sparc64/kernel/devices.c @@ -0,0 +1,144 @@ +/* devices.c: Initial scan of the prom device tree for important + * Sparc device nodes which we need to find. + * + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/threads.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/string.h> +#include <linux/spinlock.h> +#include <linux/errno.h> + +#include <asm/page.h> +#include <asm/oplib.h> +#include <asm/system.h> +#include <asm/smp.h> +#include <asm/spitfire.h> +#include <asm/timer.h> +#include <asm/cpudata.h> + +/* Used to synchronize acceses to NatSemi SUPER I/O chip configure + * operations in asm/ns87303.h + */ +DEFINE_SPINLOCK(ns87303_lock); + +extern void cpu_probe(void); +extern void central_probe(void); + +static char *cpu_mid_prop(void) +{ + if (tlb_type == spitfire) + return "upa-portid"; + return "portid"; +} + +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); + 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 == 0) + 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 == 0) + return 0; + } + + return -ENODEV; +} + +static int cpu_instance_compare(int nd, int instance, void *_arg) +{ + int desired_instance = (int) (long) _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 *)(long)instance, + prom_node, mid); +} + +static int cpu_mid_compare(int nd, int instance, void *_arg) +{ + int desired_mid = (int) (long) _arg; + int this_mid; + + this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0); + if (this_mid == desired_mid) + return 0; + return -ENODEV; +} + +int cpu_find_by_mid(int mid, int *prom_node) +{ + return __cpu_find_by(cpu_mid_compare, (void *)(long)mid, + prom_node, NULL); +} + +void __init device_scan(void) +{ + /* FIX ME FAST... -DaveM */ + ioport_resource.end = 0xffffffffffffffffUL; + + prom_printf("Booting Linux...\n"); + +#ifndef CONFIG_SMP + { + int err, cpu_node; + err = cpu_find_by_instance(0, &cpu_node, NULL); + if (err) { + prom_printf("No cpu nodes, cannot continue\n"); + prom_halt(); + } + cpu_data(0).clock_tick = prom_getintdefault(cpu_node, + "clock-frequency", + 0); + } +#endif + + central_probe(); + + cpu_probe(); +} |