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