setup.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Arch related setup for Hexagon
  4 *
  5 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
  6 */
  7
  8#include <linux/init.h>
  9#include <linux/delay.h>
 10#include <linux/memblock.h>
 11#include <linux/mmzone.h>
 12#include <linux/mm.h>
 13#include <linux/seq_file.h>
 14#include <linux/console.h>
 15#include <linux/of_fdt.h>
 16#include <asm/io.h>
 17#include <asm/sections.h>
 18#include <asm/setup.h>
 19#include <asm/processor.h>
 20#include <asm/hexagon_vm.h>
 21#include <asm/vm_mmu.h>
 22#include <asm/time.h>
 23
 24char cmd_line[COMMAND_LINE_SIZE];
 25static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 26
 27int on_simulator;
 28
 29void calibrate_delay(void)
 30{
 31	loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
 32}
 33
 34/*
 35 * setup_arch -  high level architectural setup routine
 36 * @cmdline_p: pointer to pointer to command-line arguments
 37 */
 38
 39void __init setup_arch(char **cmdline_p)
 40{
 41	char *p = &external_cmdline_buffer;
 42
 43	/*
 44	 * These will eventually be pulled in via either some hypervisor
 45	 * or devicetree description.  Hardwiring for now.
 46	 */
 47	pcycle_freq_mhz = 600;
 48	thread_freq_mhz = 100;
 49	sleep_clk_freq = 32000;
 50
 51	/*
 52	 * Set up event bindings to handle exceptions and interrupts.
 53	 */
 54	__vmsetvec(_K_VM_event_vector);
 55
 56	printk(KERN_INFO "PHYS_OFFSET=0x%08lx\n", PHYS_OFFSET);
 57
 58	/*
 59	 * Simulator has a few differences from the hardware.
 60	 * For now, check uninitialized-but-mapped memory
 61	 * prior to invoking setup_arch_memory().
 62	 */
 63	if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
 64		on_simulator = 1;
 65	else
 66		on_simulator = 0;
 67
 68	if (p[0] != '\0')
 69		strscpy(boot_command_line, p, COMMAND_LINE_SIZE);
 70	else
 71		strscpy(boot_command_line, default_command_line,
 72			COMMAND_LINE_SIZE);
 73
 74	/*
 75	 * boot_command_line and the value set up by setup_arch
 76	 * are both picked up by the init code. If no reason to
 77	 * make them different, pass the same pointer back.
 78	 */
 79	strscpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 80	*cmdline_p = cmd_line;
 81
 82	parse_early_param();
 83
 84	setup_arch_memory();
 85
 86#ifdef CONFIG_SMP
 87	smp_start_cpus();
 88#endif
 89}
 90
 91/*
 92 * Functions for dumping CPU info via /proc
 93 * Probably should move to kernel/proc.c or something.
 94 */
 95static void *c_start(struct seq_file *m, loff_t *pos)
 96{
 97	return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
 98}
 99
100static void *c_next(struct seq_file *m, void *v, loff_t *pos)
101{
102	++*pos;
103	return c_start(m, pos);
104}
105
106static void c_stop(struct seq_file *m, void *v)
107{
108}
109
110/*
111 * Eventually this will dump information about
112 * CPU properties like ISA level, TLB size, etc.
113 */
114static int show_cpuinfo(struct seq_file *m, void *v)
115{
116	int cpu = (unsigned long) v - 1;
117
118#ifdef CONFIG_SMP
119	if (!cpu_online(cpu))
120		return 0;
121#endif
122
123	seq_printf(m, "processor\t: %d\n", cpu);
124	seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
125	seq_printf(m, "BogoMips\t: %lu.%02lu\n",
126		(loops_per_jiffy * HZ) / 500000,
127		((loops_per_jiffy * HZ) / 5000) % 100);
128	seq_printf(m, "\n");
129	return 0;
130}
131
132const struct seq_operations cpuinfo_op = {
133	.start  = &c_start,
134	.next   = &c_next,
135	.stop   = &c_stop,
136	.show   = &show_cpuinfo,
137};