arch/hexagon/kernel/setup.c

   1 /*
   2  * Arch related setup for Hexagon
   3  *
   4  * Copyright (c) 2010-2011, 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
  39 char cmd_line[COMMAND_LINE_SIZE];
  40 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  41
  42 int on_simulator;
  43
  44 void __cpuinit 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
  54 void __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         /*
  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  */
 108 static 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
 113 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 114 {
 115         ++*pos;
 116         return c_start(m, pos);
 117 }
 118
 119 static 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  */
 127 static int show_cpuinfo(struct seq_file *m, void *v)
 128 {
 129         int cpu = (unsigned long) v - 1;
 130
 131         seq_printf(m, "processor\t: %d\n", cpu);
 132         seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
 133         seq_printf(m, "BogoMips\t: %lu.%02lu\n",
 134                 (loops_per_jiffy * HZ) / 500000,
 135                 ((loops_per_jiffy * HZ) / 5000) % 100);
 136         seq_printf(m, "\n");
 137         return 0;
 138 }
 139
 140 const struct seq_operations cpuinfo_op = {
 141         .start  = &c_start,
 142         .next   = &c_next,
 143         .stop   = &c_stop,
 144         .show   = &show_cpuinfo,
 145 };