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 }; 150