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/delay.h>
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>
36
37char cmd_line[COMMAND_LINE_SIZE];
38static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
39
40int on_simulator;
41
42void calibrate_delay(void)
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
52void __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
69	printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
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 */
108static 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
113static void *c_next(struct seq_file *m, void *v, loff_t *pos)
114{
115	++*pos;
116	return c_start(m, pos);
117}
118
119static 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 */
127static int show_cpuinfo(struct seq_file *m, void *v)
128{
129	int cpu = (unsigned long) v - 1;
130
131#ifdef CONFIG_SMP
132	if (!cpu_online(cpu))
133		return 0;
134#endif
135
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
145const struct seq_operations cpuinfo_op = {
146	.start  = &c_start,
147	.next   = &c_next,
148	.stop   = &c_stop,
149	.show   = &show_cpuinfo,
150};
151