Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Arch related setup for Hexagon |
| 3 | * |
Richard Kuo | 7c6a5df | 2013-03-28 20:45:40 -0500 | [diff] [blame] | 4 | * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 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> |
Guenter Roeck | cb84c2b | 2014-12-09 14:21:45 -0800 | [diff] [blame] | 22 | #include <linux/delay.h> |
Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 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> |
Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 36 | |
| 37 | char cmd_line[COMMAND_LINE_SIZE]; |
| 38 | static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; |
| 39 | |
| 40 | int on_simulator; |
| 41 | |
Paul Gortmaker | 7ddc839 | 2013-06-18 17:54:48 -0400 | [diff] [blame] | 42 | void calibrate_delay(void) |
Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 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 | |
| 52 | void __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 | |
Richard Kuo | 8f5a0b9d | 2013-03-22 16:05:40 -0500 | [diff] [blame] | 69 | printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET); |
| 70 | |
Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 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 | |
Richard Kuo | 2b3c744 | 2013-02-04 14:17:15 -0600 | [diff] [blame] | 131 | #ifdef CONFIG_SMP |
| 132 | if (!cpu_online(cpu)) |
| 133 | return 0; |
| 134 | #endif |
| 135 | |
Richard Kuo | e03167b | 2011-10-31 18:42:28 -0500 | [diff] [blame] | 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 | |
| 145 | const struct seq_operations cpuinfo_op = { |
| 146 | .start = &c_start, |
| 147 | .next = &c_next, |
| 148 | .stop = &c_stop, |
| 149 | .show = &show_cpuinfo, |
| 150 | }; |