source: mainline/kernel/arch/sparc64/src/cpu/sun4u/cpu.c@ a35b458

/*
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup sparc64
 * @{
 */
/** @file
 */

#include <arch/cpu_family.h>
#include <cpu.h>
#include <arch.h>
#include <genarch/ofw/ofw_tree.h>
#include <arch/drivers/tick.h>
#include <print.h>
#include <arch/cpu_node.h>

/**
 * Finds out the clock frequency of the current CPU.
 *
 * @param node  node representing the current CPU in the OFW tree
 * @return      clock frequency if "node" is the current CPU and no error
 *              occurs, -1 if "node" is not the current CPU or on error
 */
static int find_cpu_frequency(ofw_tree_node_t *node)
{
        ofw_tree_property_t *prop;
        uint32_t mid;

        /* 'upa-portid' for US, 'portid' for US-III, 'cpuid' for US-IV */
        prop = ofw_tree_getprop(node, "upa-portid");
        if ((!prop) || (!prop->value))
                prop = ofw_tree_getprop(node, "portid");
        if ((!prop) || (!prop->value))
                prop = ofw_tree_getprop(node, "cpuid");

        if (prop && prop->value) {
                mid = *((uint32_t *) prop->value);
                if (mid == CPU->arch.mid) {
                        prop = ofw_tree_getprop(node, "clock-frequency");
                        if (prop && prop->value) {
                                return *((uint32_t *) prop->value);
                        }
                }
        }

        return -1;
}

/** Perform sparc64 specific initialization of the processor structure for the
 * current processor.
 */
void cpu_arch_init(void)
{
        ofw_tree_node_t *node;
        uint32_t clock_frequency = 0;

        CPU->arch.mid = read_mid();

        /*
         * Detect processor frequency.
         */
        if (is_us() || is_us_iii()) {
                node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
                while (node) {
                        int f = find_cpu_frequency(node);
                        if (f != -1)
                                clock_frequency = (uint32_t) f;
                        node = ofw_tree_find_peer_by_device_type(node, "cpu");
                }
        } else if (is_us_iv()) {
                node = ofw_tree_find_child(cpus_parent(), "cmp");
                while (node) {
                        int f;
                        f = find_cpu_frequency(
                                ofw_tree_find_child(node, "cpu@0"));
                        if (f != -1)
                                clock_frequency = (uint32_t) f;
                        f = find_cpu_frequency(
                                ofw_tree_find_child(node, "cpu@1"));
                        if (f != -1)
                                clock_frequency = (uint32_t) f;
                        node = ofw_tree_find_peer_by_name(node, "cmp");
                }
        }

        CPU->arch.clock_frequency = clock_frequency;
        tick_init();
}

/** Read version information from the current processor. */
void cpu_identify(void)
{
        CPU->arch.ver.value = ver_read();
}

/** Print version information for a processor.
 *
 * This function is called by the bootstrap processor.
 *
 * @param m Processor structure of the CPU for which version information is to
 *      be printed.
 */
void cpu_print_report(cpu_t *m)
{
        const char *manuf;
        const char *impl;

        switch (m->arch.ver.manuf) {
        case MANUF_FUJITSU:
                manuf = "Fujitsu";
                break;
        case MANUF_ULTRASPARC:
                manuf = "UltraSPARC";
                break;
        case MANUF_SUN:
                manuf = "Sun";
                break;
        default:
                manuf = "Unknown";
                break;
        }

        switch (CPU->arch.ver.impl) {
        case IMPL_ULTRASPARCI:
                impl = "UltraSPARC I";
                break;
        case IMPL_ULTRASPARCII:
                impl = "UltraSPARC II";
                break;
        case IMPL_ULTRASPARCII_I:
                impl = "UltraSPARC IIi";
                break;
        case IMPL_ULTRASPARCII_E:
                impl = "UltraSPARC IIe";
                break;
        case IMPL_ULTRASPARCIII:
                impl = "UltraSPARC III";
                break;
        case IMPL_ULTRASPARCIII_PLUS:
                impl = "UltraSPARC III+";
                break;
        case IMPL_ULTRASPARCIII_I:
                impl = "UltraSPARC IIIi";
                break;
        case IMPL_ULTRASPARCIV:
                impl = "UltraSPARC IV";
                break;
        case IMPL_ULTRASPARCIV_PLUS:
                impl = "UltraSPARC IV+";
                break;
        case IMPL_SPARC64V:
                impl = "SPARC 64V";
                break;
        default:
                impl = "Unknown";
                break;
        }

        printf("cpu%d: manuf=%s, impl=%s, mask=%d (%d MHz)\n", m->id, manuf,
                impl, m->arch.ver.mask, m->arch.clock_frequency / 1000000);
}

/** @}
 */