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
24 char cmd_line[COMMAND_LINE_SIZE];
25 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
26
27 int on_simulator;
28
29 void 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
39 void __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 */
95 static 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
100 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
101 {
102 ++*pos;
103 return c_start(m, pos);
104 }
105
106 static 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 */
114 static 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
132 const struct seq_operations cpuinfo_op = {
133 .start = &c_start,
134 .next = &c_next,
135 .stop = &c_stop,
136 .show = &show_cpuinfo,
137 };
138
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