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e03167b2 RK |
1 | /* |
2 | * Arch related setup for Hexagon | |
3 | * | |
7c6a5df4 | 4 | * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. |
e03167b2 RK |
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 | ||
7ddc8399 | 44 | void calibrate_delay(void) |
e03167b2 RK |
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 | ||
8f5a0b9d RK |
71 | printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET); |
72 | ||
e03167b2 RK |
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 | ||
2b3c744c RK |
133 | #ifdef CONFIG_SMP |
134 | if (!cpu_online(cpu)) | |
135 | return 0; | |
136 | #endif | |
137 | ||
e03167b2 RK |
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 | }; |