1/* MN10300 Arch-specific initialisation
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#include <linux/errno.h>
12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/stddef.h>
16#include <linux/unistd.h>
17#include <linux/ptrace.h>
18#include <linux/user.h>
19#include <linux/tty.h>
20#include <linux/ioport.h>
21#include <linux/delay.h>
22#include <linux/init.h>
23#include <linux/bootmem.h>
24#include <linux/seq_file.h>
25#include <linux/cpu.h>
26#include <asm/processor.h>
27#include <linux/console.h>
28#include <asm/uaccess.h>
29#include <asm/setup.h>
30#include <asm/io.h>
31#include <asm/smp.h>
32#include <proc/proc.h>
33#include <asm/fpu.h>
34#include <asm/sections.h>
35
36struct mn10300_cpuinfo boot_cpu_data;
37
38static char __initdata cmd_line[COMMAND_LINE_SIZE];
39char redboot_command_line[COMMAND_LINE_SIZE] =
40	"console=ttyS0,115200 root=/dev/mtdblock3 rw";
41
42char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
43
44static struct resource code_resource = {
45	.start	= 0x100000,
46	.end	= 0,
47	.name	= "Kernel code",
48};
49
50static struct resource data_resource = {
51	.start	= 0,
52	.end	= 0,
53	.name	= "Kernel data",
54};
55
56static unsigned long __initdata phys_memory_base;
57static unsigned long __initdata phys_memory_end;
58static unsigned long __initdata memory_end;
59unsigned long memory_size;
60
61struct thread_info *__current_ti = &init_thread_union.thread_info;
62struct task_struct *__current = &init_task;
63
64#define mn10300_known_cpus 5
65static const char *const mn10300_cputypes[] = {
66	"am33-1",
67	"am33-2",
68	"am34-1",
69	"am33-3",
70	"am34-2",
71	"unknown"
72};
73
74/*
75 * Pick out the memory size.  We look for mem=size,
76 * where size is "size[KkMm]"
77 */
78static int __init early_mem(char *p)
79{
80	memory_size = memparse(p, &p);
81
82	if (memory_size == 0)
83		panic("Memory size not known\n");
84
85	return 0;
86}
87early_param("mem", early_mem);
88
89/*
90 * architecture specific setup
91 */
92void __init setup_arch(char **cmdline_p)
93{
94	unsigned long bootmap_size;
95	unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
96
97	cpu_init();
98	unit_setup();
99	smp_init_cpus();
100
101	/* save unparsed command line copy for /proc/cmdline */
102	strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE);
103
104	/* populate cmd_line too for later use, preserving boot_command_line */
105	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
106	*cmdline_p = cmd_line;
107
108	parse_early_param();
109
110	memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
111		memory_size;
112	if (memory_end > phys_memory_end)
113		memory_end = phys_memory_end;
114
115	init_mm.start_code = (unsigned long)&_text;
116	init_mm.end_code = (unsigned long) &_etext;
117	init_mm.end_data = (unsigned long) &_edata;
118	init_mm.brk = (unsigned long) &_end;
119
120	code_resource.start = virt_to_bus(&_text);
121	code_resource.end = virt_to_bus(&_etext)-1;
122	data_resource.start = virt_to_bus(&_etext);
123	data_resource.end = virt_to_bus(&_edata)-1;
124
125	start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
126	kstart_pfn = PFN_UP(__pa(&_text));
127	free_pfn = PFN_UP(__pa(&_end));
128	end_pfn = PFN_DOWN(__pa(memory_end));
129
130	bootmap_size = init_bootmem_node(&contig_page_data,
131					 free_pfn,
132					 start_pfn,
133					 end_pfn);
134
135	if (kstart_pfn > start_pfn)
136		free_bootmem(PFN_PHYS(start_pfn),
137			     PFN_PHYS(kstart_pfn - start_pfn));
138
139	free_bootmem(PFN_PHYS(free_pfn),
140		     PFN_PHYS(end_pfn - free_pfn));
141
142	/* If interrupt vector table is in main ram, then we need to
143	   reserve the page it is occupying. */
144	if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
145	    CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
146		reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
147				BOOTMEM_DEFAULT);
148
149	reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
150			BOOTMEM_DEFAULT);
151
152#ifdef CONFIG_VT
153#if defined(CONFIG_VGA_CONSOLE)
154	conswitchp = &vga_con;
155#elif defined(CONFIG_DUMMY_CONSOLE)
156	conswitchp = &dummy_con;
157#endif
158#endif
159
160	paging_init();
161}
162
163/*
164 * perform CPU initialisation
165 */
166void __init cpu_init(void)
167{
168	unsigned long cpurev = CPUREV, type;
169
170	type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
171	if (type > mn10300_known_cpus)
172		type = mn10300_known_cpus;
173
174	printk(KERN_INFO "Panasonic %s, rev %ld\n",
175	       mn10300_cputypes[type],
176	       (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
177
178	get_mem_info(&phys_memory_base, &memory_size);
179	phys_memory_end = phys_memory_base + memory_size;
180
181	fpu_init_state();
182}
183
184static struct cpu cpu_devices[NR_CPUS];
185
186static int __init topology_init(void)
187{
188	int i;
189
190	for_each_present_cpu(i)
191		register_cpu(&cpu_devices[i], i);
192
193	return 0;
194}
195
196subsys_initcall(topology_init);
197
198/*
199 * Get CPU information for use by the procfs.
200 */
201static int show_cpuinfo(struct seq_file *m, void *v)
202{
203#ifdef CONFIG_SMP
204	struct mn10300_cpuinfo *c = v;
205	unsigned long cpu_id = c - cpu_data;
206	unsigned long cpurev = c->type, type, icachesz, dcachesz;
207#else  /* CONFIG_SMP */
208	unsigned long cpu_id = 0;
209	unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
210#endif /* CONFIG_SMP */
211
212#ifdef CONFIG_SMP
213	if (!cpu_online(cpu_id))
214		return 0;
215#endif
216
217	type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
218	if (type > mn10300_known_cpus)
219		type = mn10300_known_cpus;
220
221	icachesz =
222		((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
223		((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
224		1024;
225
226	dcachesz =
227		((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
228		((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
229		1024;
230
231	seq_printf(m,
232		   "processor  : %ld\n"
233		   "vendor_id  : " PROCESSOR_VENDOR_NAME "\n"
234		   "cpu core   : %s\n"
235		   "cpu rev    : %lu\n"
236		   "model name : " PROCESSOR_MODEL_NAME		"\n"
237		   "icache size: %lu\n"
238		   "dcache size: %lu\n",
239		   cpu_id,
240		   mn10300_cputypes[type],
241		   (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
242		   icachesz,
243		   dcachesz
244		   );
245
246	seq_printf(m,
247		   "ioclk speed: %lu.%02luMHz\n"
248		   "bogomips   : %lu.%02lu\n\n",
249		   MN10300_IOCLK / 1000000,
250		   (MN10300_IOCLK / 10000) % 100,
251#ifdef CONFIG_SMP
252		   c->loops_per_jiffy / (500000 / HZ),
253		   (c->loops_per_jiffy / (5000 / HZ)) % 100
254#else  /* CONFIG_SMP */
255		   loops_per_jiffy / (500000 / HZ),
256		   (loops_per_jiffy / (5000 / HZ)) % 100
257#endif /* CONFIG_SMP */
258		   );
259
260	return 0;
261}
262
263static void *c_start(struct seq_file *m, loff_t *pos)
264{
265	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
266}
267
268static void *c_next(struct seq_file *m, void *v, loff_t *pos)
269{
270	++*pos;
271	return c_start(m, pos);
272}
273
274static void c_stop(struct seq_file *m, void *v)
275{
276}
277
278const struct seq_operations cpuinfo_op = {
279	.start	= c_start,
280	.next	= c_next,
281	.stop	= c_stop,
282	.show	= show_cpuinfo,
283};
284