processor.c

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/*
 *    Initial setup-routines for HP 9000 based hardware.
 *
 *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
 *    Modifications for PA-RISC (C) 1999-2008 Helge Deller <[email protected]>
 *    Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
 *    Modifications copyright 2000 Martin K. Petersen <[email protected]>
 *    Modifications copyright 2000 Philipp Rumpf <[email protected]>
 *    Modifications copyright 2001 Ryan Bradetich <[email protected]>
 *
 *    Initial PA-RISC Version: 04-23-1999 by Helge Deller
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <asm/param.h>
#include <asm/cache.h>
#include <asm/hardware.h>   /* for register_parisc_driver() stuff */
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/pdc.h>
#include <asm/pdcpat.h>
#include <asm/irq.h>        /* for struct irq_region */
#include <asm/parisc-device.h>

struct system_cpuinfo_parisc boot_cpu_data __read_mostly;
EXPORT_SYMBOL(boot_cpu_data);

DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);

extern int update_cr16_clocksource(void);   /* from time.c */

/*
**      PARISC CPU driver - claim "device" and initialize CPU data structures.
**
** Consolidate per CPU initialization into (mostly) one module.
** Monarch CPU will initialize boot_cpu_data which shouldn't
** change once the system has booted.
**
** The callback *should* do per-instance initialization of
** everything including the monarch. "Per CPU" init code in
** setup.c:start_parisc() has migrated here and start_parisc()
** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
**
** The goal of consolidating CPU initialization into one place is
** to make sure all CPUs get initialized the same way.
** The code path not shared is how PDC hands control of the CPU to the OS.
** The initialization of OS data structures is the same (done below).
*/

static void __cpuinit
init_percpu_prof(unsigned long cpunum)
{
    struct cpuinfo_parisc *p;

    p = &per_cpu(cpu_data, cpunum);
    p->prof_counter = 1;
    p->prof_multiplier = 1;
}


static int __cpuinit processor_probe(struct parisc_device *dev)
{
    unsigned long txn_addr;
    unsigned long cpuid;
    struct cpuinfo_parisc *p;

#ifdef CONFIG_SMP
    if (num_online_cpus() >= nr_cpu_ids) {
        printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
        return 1;
    }
#else
    if (boot_cpu_data.cpu_count > 0) {
        printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
        return 1;
    }
#endif

    /* logical CPU ID and update global counter
     * May get overwritten by PAT code.
     */
    cpuid = boot_cpu_data.cpu_count;
    txn_addr = dev->hpa.start;  /* for legacy PDC */

#ifdef CONFIG_64BIT
    if (is_pdc_pat()) {
        ulong status;
        unsigned long bytecnt;
            pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
#undef USE_PAT_CPUID
#ifdef USE_PAT_CPUID
        struct pdc_pat_cpu_num cpu_info;
#endif

        pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
        if (!pa_pdc_cell)
            panic("couldn't allocate memory for PDC_PAT_CELL!");

        status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
            dev->mod_index, PA_VIEW, pa_pdc_cell);

        BUG_ON(PDC_OK != status);

        /* verify it's the same as what do_pat_inventory() found */
        BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
        BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);

        txn_addr = pa_pdc_cell->mod[0];   /* id_eid for IO sapic */

        kfree(pa_pdc_cell);

#ifdef USE_PAT_CPUID
/* We need contiguous numbers for cpuid. Firmware's notion
 * of cpuid is for physical CPUs and we just don't care yet.
 * We'll care when we need to query PAT PDC about a CPU *after*
 * boot time (ie shutdown a CPU from an OS perspective).
 */
        /* get the cpu number */
        status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);

        BUG_ON(PDC_OK != status);

        if (cpu_info.cpu_num >= NR_CPUS) {
            printk(KERN_WARNING "IGNORING CPU at 0x%x,"
                " cpu_slot_id > NR_CPUS"
                " (%ld > %d)\n",
                dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
            /* Ignore CPU since it will only crash */
            boot_cpu_data.cpu_count--;
            return 1;
        } else {
            cpuid = cpu_info.cpu_num;
        }
#endif
    }
#endif

    p = &per_cpu(cpu_data, cpuid);
    boot_cpu_data.cpu_count++;

    /* initialize counters - CPU 0 gets it_value set in time_init() */
    if (cpuid)
        memset(p, 0, sizeof(struct cpuinfo_parisc));

    p->loops_per_jiffy = loops_per_jiffy;
    p->dev = dev;       /* Save IODC data in case we need it */
    p->hpa = dev->hpa.start;    /* save CPU hpa */
    p->cpuid = cpuid;   /* save CPU id */
    p->txn_addr = txn_addr; /* save CPU IRQ address */
#ifdef CONFIG_SMP
    /*
    ** FIXME: review if any other initialization is clobbered
    **    for boot_cpu by the above memset().
    */
    init_percpu_prof(cpuid);
#endif

    /*
    ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
    ** OS control. RENDEZVOUS is the default state - see mem_set above.
    **  p->state = STATE_RENDEZVOUS;
    */

#if 0
    /* CPU 0 IRQ table is statically allocated/initialized */
    if (cpuid) {
        struct irqaction actions[];

        /*
        ** itimer and ipi IRQ handlers are statically initialized in
        ** arch/parisc/kernel/irq.c. ie Don't need to register them.
        */
        actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
        if (!actions) {
            /* not getting it's own table, share with monarch */
            actions = cpu_irq_actions[0];
        }

        cpu_irq_actions[cpuid] = actions;
    }
#endif

    /* 
     * Bring this CPU up now! (ignore bootstrap cpuid == 0)
     */
#ifdef CONFIG_SMP
    if (cpuid) {
        set_cpu_present(cpuid, true);
        cpu_up(cpuid);
    }
#endif

    /* If we've registered more than one cpu,
     * we'll use the jiffies clocksource since cr16
     * is not synchronized between CPUs.
     */
    update_cr16_clocksource();

    return 0;
}

void __init collect_boot_cpu_data(void)
{
    memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));

    boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */

    /* get CPU-Model Information... */
#define p ((unsigned long *)&boot_cpu_data.pdc.model)
    if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK)
        printk(KERN_INFO 
            "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
            p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
#undef p

    if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK)
        printk(KERN_INFO "vers  %08lx\n", 
            boot_cpu_data.pdc.versions);

    if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK)
        printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
            (boot_cpu_data.pdc.cpuid >> 5) & 127,
            boot_cpu_data.pdc.cpuid & 31,
            boot_cpu_data.pdc.cpuid);

    if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
        printk(KERN_INFO "capabilities 0x%lx\n",
            boot_cpu_data.pdc.capabilities);

    if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
        printk(KERN_INFO "model %s\n",
            boot_cpu_data.pdc.sys_model_name);

    boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
    boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;

    boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
    boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
    boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
}



int __cpuinit init_per_cpu(int cpunum)
{
    int ret;
    struct pdc_coproc_cfg coproc_cfg;

    set_firmware_width();
    ret = pdc_coproc_cfg(&coproc_cfg);

    if(ret >= 0 && coproc_cfg.ccr_functional) {
        mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */

        /* FWIW, FP rev/model is a more accurate way to determine
        ** CPU type. CPU rev/model has some ambiguous cases.
        */
        per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
        per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;

        printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
            cpunum, coproc_cfg.revision, coproc_cfg.model);

        /*
        ** store status register to stack (hopefully aligned)
        ** and clear the T-bit.
        */
        asm volatile ("fstd    %fr0,8(%sp)");

    } else {
        printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
            " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
#ifdef CONFIG_64BIT
            "Halting Machine - FP required\n"
#endif
            , coproc_cfg.ccr_functional);
#ifdef CONFIG_64BIT
        mdelay(100);    /* previous chars get pushed to console */
        panic("FP CoProc not reported");
#endif
    }

    /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
    init_percpu_prof(cpunum);

    return ret;
}

/*
 * Display CPU info for all CPUs.
 */
int
show_cpuinfo (struct seq_file *m, void *v)
{
    unsigned long cpu;

    for_each_online_cpu(cpu) {
        const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
#ifdef CONFIG_SMP
        if (0 == cpuinfo->hpa)
            continue;
#endif
        seq_printf(m, "processor\t: %lu\n"
                "cpu family\t: PA-RISC %s\n",
                 cpu, boot_cpu_data.family_name);

        seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );

        /* cpu MHz */
        seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
                 boot_cpu_data.cpu_hz / 1000000,
                 boot_cpu_data.cpu_hz % 1000000  );

        seq_printf(m, "capabilities\t:");
        if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
            seq_printf(m, " os32");
        if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
            seq_printf(m, " os64");
        seq_printf(m, "\n");

        seq_printf(m, "model\t\t: %s\n"
                "model name\t: %s\n",
                 boot_cpu_data.pdc.sys_model_name,
                 cpuinfo->dev ?
                 cpuinfo->dev->name : "Unknown");

        seq_printf(m, "hversion\t: 0x%08x\n"
                    "sversion\t: 0x%08x\n",
                 boot_cpu_data.hversion,
                 boot_cpu_data.sversion );

        /* print cachesize info */
        show_cache_info(m);

        seq_printf(m, "bogomips\t: %lu.%02lu\n",
                 cpuinfo->loops_per_jiffy / (500000 / HZ),
                 (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);

        seq_printf(m, "software id\t: %ld\n\n",
                boot_cpu_data.pdc.model.sw_id);
    }
    return 0;
}

static const struct parisc_device_id processor_tbl[] = {
    { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
    { 0, }
};

static struct parisc_driver cpu_driver = {
    .name       = "CPU",
    .id_table   = processor_tbl,
    .probe      = processor_probe
};

void __init processor_init(void)
{
    register_parisc_driver(&cpu_driver);
}