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
36char cmd_line[COMMAND_LINE_SIZE];
37static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
38
39int on_simulator;
40
41void 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
51void __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 */
107static 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
112static void *c_next(struct seq_file *m, void *v, loff_t *pos)
113{
114	++*pos;
115	return c_start(m, pos);
116}
117
118static 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 */
126static 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
144const struct seq_operations cpuinfo_op = {
145	.start  = &c_start,
146	.next   = &c_next,
147	.stop   = &c_stop,
148	.show   = &show_cpuinfo,
149};
150