2 * Arch related setup for Hexagon
4 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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.
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.
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
21 #include <linux/init.h>
22 #include <linux/bootmem.h>
23 #include <linux/mmzone.h>
25 #include <linux/seq_file.h>
26 #include <linux/console.h>
27 #include <linux/of_fdt.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>
36 char cmd_line
[COMMAND_LINE_SIZE
];
37 static char default_command_line
[COMMAND_LINE_SIZE
] __initdata
= CONFIG_CMDLINE
;
41 void calibrate_delay(void)
43 loops_per_jiffy
= thread_freq_mhz
* 1000000 / HZ
;
47 * setup_arch - high level architectural setup routine
48 * @cmdline_p: pointer to pointer to command-line arguments
51 void __init
setup_arch(char **cmdline_p
)
53 char *p
= &external_cmdline_buffer
;
56 * These will eventually be pulled in via either some hypervisor
57 * or devicetree description. Hardwiring for now.
59 pcycle_freq_mhz
= 600;
60 thread_freq_mhz
= 100;
61 sleep_clk_freq
= 32000;
64 * Set up event bindings to handle exceptions and interrupts.
66 __vmsetvec(_K_VM_event_vector
);
68 printk(KERN_INFO
"PHYS_OFFSET=0x%08x\n", PHYS_OFFSET
);
71 * Simulator has a few differences from the hardware.
72 * For now, check uninitialized-but-mapped memory
73 * prior to invoking setup_arch_memory().
75 if (*(int *)((unsigned long)_end
+ 8) == 0x1f1f1f1f)
81 strlcpy(boot_command_line
, p
, COMMAND_LINE_SIZE
);
83 strlcpy(boot_command_line
, default_command_line
,
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.
91 strlcpy(cmd_line
, boot_command_line
, COMMAND_LINE_SIZE
);
92 *cmdline_p
= cmd_line
;
104 * Functions for dumping CPU info via /proc
105 * Probably should move to kernel/proc.c or something.
107 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
109 return *pos
< nr_cpu_ids
? (void *)((unsigned long) *pos
+ 1) : NULL
;
112 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
115 return c_start(m
, pos
);
118 static void c_stop(struct seq_file
*m
, void *v
)
123 * Eventually this will dump information about
124 * CPU properties like ISA level, TLB size, etc.
126 static int show_cpuinfo(struct seq_file
*m
, void *v
)
128 int cpu
= (unsigned long) v
- 1;
131 if (!cpu_online(cpu
))
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);
144 const struct seq_operations cpuinfo_op
= {
148 .show
= &show_cpuinfo
,