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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sparc/] [kernel/] [devices.c] - Blame information for rev 3

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1 3 xianfeng 
/* devices.c: Initial scan of the prom device tree for important
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 *            Sparc device nodes which we need to find.
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 *
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 * This is based on the sparc64 version, but sun4m doesn't always use
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 * the hardware MIDs, so be careful.
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 *
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 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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 */
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#include <linux/kernel.h>
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#include <linux/threads.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <asm/page.h>
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#include <asm/oplib.h>
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#include <asm/prom.h>
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#include <asm/smp.h>
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#include <asm/system.h>
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#include <asm/cpudata.h>
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extern void cpu_probe(void);
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extern void clock_stop_probe(void); /* tadpole.c */
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extern void sun4c_probe_memerr_reg(void);
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static char *cpu_mid_prop(void)
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{
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        if (sparc_cpu_model == sun4d)
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                return "cpu-id";
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        return "mid";
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}
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static int check_cpu_node(int nd, int *cur_inst,
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                          int (*compare)(int, int, void *), void *compare_arg,
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                          int *prom_node, int *mid)
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{
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        if (!compare(nd, *cur_inst, compare_arg)) {
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                if (prom_node)
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                        *prom_node = nd;
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                if (mid) {
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                        *mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
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                        if (sparc_cpu_model == sun4m)
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                                *mid &= 3;
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                }
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                return 0;
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        }
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        (*cur_inst)++;
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        return -ENODEV;
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}
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static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
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                         int *prom_node, int *mid)
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{
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        struct device_node *dp;
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        int cur_inst;
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        cur_inst = 0;
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        for_each_node_by_type(dp, "cpu") {
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                int err = check_cpu_node(dp->node, &cur_inst,
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                                         compare, compare_arg,
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                                         prom_node, mid);
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                if (!err) {
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                        of_node_put(dp);
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                        return 0;
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                }
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        }
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        return -ENODEV;
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}
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static int cpu_instance_compare(int nd, int instance, void *_arg)
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{
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        int desired_instance = (int) _arg;
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        if (instance == desired_instance)
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                return 0;
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        return -ENODEV;
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}
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int cpu_find_by_instance(int instance, int *prom_node, int *mid)
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{
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        return __cpu_find_by(cpu_instance_compare, (void *)instance,
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                             prom_node, mid);
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}
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static int cpu_mid_compare(int nd, int instance, void *_arg)
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{
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        int desired_mid = (int) _arg;
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        int this_mid;
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        this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
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        if (this_mid == desired_mid
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            || (sparc_cpu_model == sun4m && (this_mid & 3) == desired_mid))
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                return 0;
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        return -ENODEV;
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}
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int cpu_find_by_mid(int mid, int *prom_node)
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{
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        return __cpu_find_by(cpu_mid_compare, (void *)mid,
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                             prom_node, NULL);
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}
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/* sun4m uses truncated mids since we base the cpuid on the ttable/irqset
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 * address (0-3).  This gives us the true hardware mid, which might have
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 * some other bits set.  On 4d hardware and software mids are the same.
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 */
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int cpu_get_hwmid(int prom_node)
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{
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        return prom_getintdefault(prom_node, cpu_mid_prop(), -ENODEV);
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}
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void __init device_scan(void)
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{
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        prom_printf("Booting Linux...\n");
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#ifndef CONFIG_SMP
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        {
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                int err, cpu_node;
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                err = cpu_find_by_instance(0, &cpu_node, NULL);
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                if (err) {
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                        /* Probably a sun4e, Sun is trying to trick us ;-) */
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                        prom_printf("No cpu nodes, cannot continue\n");
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                        prom_halt();
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                }
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                cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
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                                                            "clock-frequency",
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                                                            0);
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        }
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#endif /* !CONFIG_SMP */
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        cpu_probe();
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#ifdef CONFIG_SUN_AUXIO
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        {
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                extern void auxio_probe(void);
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                extern void auxio_power_probe(void);
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                auxio_probe();
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                auxio_power_probe();
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        }
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#endif
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        clock_stop_probe();
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        if (ARCH_SUN4C_SUN4)
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                sun4c_probe_memerr_reg();
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        return;
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}

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