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/delay.h>
  23#include <linux/bootmem.h>
  24#include <linux/mmzone.h>
  25#include <linux/mm.h>
  26#include <linux/seq_file.h>
  27#include <linux/console.h>
  28#include <linux/of_fdt.h>
  29#include <asm/io.h>
  30#include <asm/sections.h>
  31#include <asm/setup.h>
  32#include <asm/processor.h>
  33#include <asm/hexagon_vm.h>
  34#include <asm/vm_mmu.h>
  35#include <asm/time.h>
  36
  37char cmd_line[COMMAND_LINE_SIZE];
  38static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  39
  40int on_simulator;
  41
  42void calibrate_delay(void)
  43{
  44        loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
  45}
  46
  47/*
  48 * setup_arch -  high level architectural setup routine
  49 * @cmdline_p: pointer to pointer to command-line arguments
  50 */
  51
  52void __init setup_arch(char **cmdline_p)
  53{
  54        char *p = &external_cmdline_buffer;
  55
  56        /*
  57         * These will eventually be pulled in via either some hypervisor
  58         * or devicetree description.  Hardwiring for now.
  59         */
  60        pcycle_freq_mhz = 600;
  61        thread_freq_mhz = 100;
  62        sleep_clk_freq = 32000;
  63
  64        /*
  65         * Set up event bindings to handle exceptions and interrupts.
  66         */
  67        __vmsetvec(_K_VM_event_vector);
  68
  69        printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
  70
  71        /*
  72         * Simulator has a few differences from the hardware.
  73         * For now, check uninitialized-but-mapped memory
  74         * prior to invoking setup_arch_memory().
  75         */
  76        if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
  77                on_simulator = 1;
  78        else
  79                on_simulator = 0;
  80
  81        if (p[0] != '\0')
  82                strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
  83        else
  84                strlcpy(boot_command_line, default_command_line,
  85                        COMMAND_LINE_SIZE);
  86
  87        /*
  88         * boot_command_line and the value set up by setup_arch
  89         * are both picked up by the init code. If no reason to
  90         * make them different, pass the same pointer back.
  91         */
  92        strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
  93        *cmdline_p = cmd_line;
  94
  95        parse_early_param();
  96
  97        setup_arch_memory();
  98
  99#ifdef CONFIG_SMP
 100        smp_start_cpus();
 101#endif
 102}
 103
 104/*
 105 * Functions for dumping CPU info via /proc
 106 * Probably should move to kernel/proc.c or something.
 107 */
 108static void *c_start(struct seq_file *m, loff_t *pos)
 109{
 110        return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
 111}
 112
 113static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 114{
 115        ++*pos;
 116        return c_start(m, pos);
 117}
 118
 119static void c_stop(struct seq_file *m, void *v)
 120{
 121}
 122
 123/*
 124 * Eventually this will dump information about
 125 * CPU properties like ISA level, TLB size, etc.
 126 */
 127static int show_cpuinfo(struct seq_file *m, void *v)
 128{
 129        int cpu = (unsigned long) v - 1;
 130
 131#ifdef CONFIG_SMP
 132        if (!cpu_online(cpu))
 133                return 0;
 134#endif
 135
 136        seq_printf(m, "processor\t: %d\n", cpu);
 137        seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
 138        seq_printf(m, "BogoMips\t: %lu.%02lu\n",
 139                (loops_per_jiffy * HZ) / 500000,
 140                ((loops_per_jiffy * HZ) / 5000) % 100);
 141        seq_printf(m, "\n");
 142        return 0;
 143}
 144
 145const struct seq_operations cpuinfo_op = {
 146        .start  = &c_start,
 147        .next   = &c_next,
 148        .stop   = &c_stop,
 149        .show   = &show_cpuinfo,
 150};
 151