LXR linux/arch/hexagon/kernel/setup.c

   1/*
   2 * Arch related setup for Hexagon
   3 *
   4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 and
   8 * only version 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18 * 02110-1301, USA.
  19 */
  20
  21#include <linux/init.h>
  22#include <linux/bootmem.h>
  23#include <linux/mmzone.h>
  24#include <linux/mm.h>
  25#include <linux/seq_file.h>
  26#include <linux/console.h>
  27#include <linux/of_fdt.h>
  28#include <asm/io.h>
  29#include <asm/sections.h>
  30#include <asm/setup.h>
  31#include <asm/processor.h>
  32#include <asm/hexagon_vm.h>
  33#include <asm/vm_mmu.h>
  34#include <asm/time.h>
  35#ifdef CONFIG_OF
  36#include <asm/prom.h>
  37#endif
  38
  39char cmd_line[COMMAND_LINE_SIZE];
  40static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  41
  42int on_simulator;
  43
  44void calibrate_delay(void)
  45{
  46        loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
  47}
  48
  49/*
  50 * setup_arch -  high level architectural setup routine
  51 * @cmdline_p: pointer to pointer to command-line arguments
  52 */
  53
  54void __init setup_arch(char **cmdline_p)
  55{
  56        char *p = &external_cmdline_buffer;
  57
  58        /*
  59         * These will eventually be pulled in via either some hypervisor
  60         * or devicetree description.  Hardwiring for now.
  61         */
  62        pcycle_freq_mhz = 600;
  63        thread_freq_mhz = 100;
  64        sleep_clk_freq = 32000;
  65
  66        /*
  67         * Set up event bindings to handle exceptions and interrupts.
  68         */
  69        __vmsetvec(_K_VM_event_vector);
  70
  71        printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
  72
  73        /*
  74         * Simulator has a few differences from the hardware.
  75         * For now, check uninitialized-but-mapped memory
  76         * prior to invoking setup_arch_memory().
  77         */
  78        if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
  79                on_simulator = 1;
  80        else
  81                on_simulator = 0;
  82
  83        if (p[0] != '\0')
  84                strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
  85        else
  86                strlcpy(boot_command_line, default_command_line,
  87                        COMMAND_LINE_SIZE);
  88
  89        /*
  90         * boot_command_line and the value set up by setup_arch
  91         * are both picked up by the init code. If no reason to
  92         * make them different, pass the same pointer back.
  93         */
  94        strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
  95        *cmdline_p = cmd_line;
  96
  97        parse_early_param();
  98
  99        setup_arch_memory();
 100
 101#ifdef CONFIG_SMP
 102        smp_start_cpus();
 103#endif
 104}
 105
 106/*
 107 * Functions for dumping CPU info via /proc
 108 * Probably should move to kernel/proc.c or something.
 109 */
 110static void *c_start(struct seq_file *m, loff_t *pos)
 111{
 112        return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
 113}
 114
 115static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 116{
 117        ++*pos;
 118        return c_start(m, pos);
 119}
 120
 121static void c_stop(struct seq_file *m, void *v)
 122{
 123}
 124
 125/*
 126 * Eventually this will dump information about
 127 * CPU properties like ISA level, TLB size, etc.
 128 */
 129static int show_cpuinfo(struct seq_file *m, void *v)
 130{
 131        int cpu = (unsigned long) v - 1;
 132
 133#ifdef CONFIG_SMP
 134        if (!cpu_online(cpu))
 135                return 0;
 136#endif
 137
 138        seq_printf(m, "processor\t: %d\n", cpu);
 139        seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
 140        seq_printf(m, "BogoMips\t: %lu.%02lu\n",
 141                (loops_per_jiffy * HZ) / 500000,
 142                ((loops_per_jiffy * HZ) / 5000) % 100);
 143        seq_printf(m, "\n");
 144        return 0;
 145}
 146
 147const struct seq_operations cpuinfo_op = {
 148        .start  = &c_start,
 149        .next   = &c_next,
 150        .stop   = &c_stop,
 151        .show   = &show_cpuinfo,
 152};
 153