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 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 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 */ 110 static void *c_start(struct seq_file *m, loff_t *pos) 111 { 112 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 113 } 114 115 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 116 { 117 ++*pos; 118 return c_start(m, pos); 119 } 120 121 static 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 */ 129 static 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 } 146 147 const struct seq_operations cpuinfo_op = { 148 .start = &c_start, 149 .next = &c_next, 150 .stop = &c_stop, 151 .show = &show_cpuinfo, 152 }; 153