[deliverable/linux.git] / arch / unicore32 / kernel / setup.c

/*
 * linux/arch/unicore32/kernel/setup.c
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/screen_info.h>
#include <linux/init.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/memblock.h>
#include <linux/elf.h>
#include <linux/io.h>

#include <asm/cputype.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/traps.h>
#include <asm/memblock.h>

#include "setup.h"

#ifndef MEM_SIZE
#define MEM_SIZE	(16*1024*1024)
#endif

struct stack {
	u32 irq[3];
	u32 abt[3];
	u32 und[3];
} ____cacheline_aligned;

static struct stack stacks[NR_CPUS];

#ifdef CONFIG_VGA_CONSOLE
struct screen_info screen_info;
#endif

char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);

static char __initdata cmd_line[COMMAND_LINE_SIZE];

static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;

/*
 * Standard memory resources
 */
static struct resource mem_res[] = {
	{
		.name = "Kernel code",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_SYSTEM_RAM
	},
	{
		.name = "Kernel data",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_SYSTEM_RAM
	}
};

#define kernel_code mem_res[0]
#define kernel_data mem_res[1]

/*
 * These functions re-use the assembly code in head.S, which
 * already provide the required functionality.
 */
static void __init setup_processor(void)
{
	printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
	       uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);

	sprintf(init_utsname()->machine, "puv3");
	sprintf(elf_platform, "ucv2");
}

/*
 * cpu_init - initialise one CPU.
 *
 * cpu_init sets up the per-CPU stacks.
 */
void cpu_init(void)
{
	unsigned int cpu = smp_processor_id();
	struct stack *stk = &stacks[cpu];

	/*
	 * setup stacks for re-entrant exception handlers
	 */
	__asm__ (
	"mov.a	asr, %1\n\t"
	"add	sp, %0, %2\n\t"
	"mov.a	asr, %3\n\t"
	"add	sp, %0, %4\n\t"
	"mov.a	asr, %5\n\t"
	"add	sp, %0, %6\n\t"
	"mov.a	asr, %7"
	    :
	    : "r" (stk),
	      "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
	      "I" (offsetof(struct stack, irq[0])),
	      "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
	      "I" (offsetof(struct stack, abt[0])),
	      "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
	      "I" (offsetof(struct stack, und[0])),
	      "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
	: "r30", "cc");
}

static int __init uc32_add_memory(unsigned long start, unsigned long size)
{
	struct membank *bank = &meminfo.bank[meminfo.nr_banks];

	if (meminfo.nr_banks >= NR_BANKS) {
		printk(KERN_CRIT "NR_BANKS too low, "
			"ignoring memory at %#lx\n", start);
		return -EINVAL;
	}

	/*
	 * Ensure that start/size are aligned to a page boundary.
	 * Size is appropriately rounded down, start is rounded up.
	 */
	size -= start & ~PAGE_MASK;

	bank->start = PAGE_ALIGN(start);
	bank->size  = size & PAGE_MASK;

	/*
	 * Check whether this memory region has non-zero size or
	 * invalid node number.
	 */
	if (bank->size == 0)
		return -EINVAL;

	meminfo.nr_banks++;
	return 0;
}

/*
 * Pick out the memory size.  We look for mem=size@start,
 * where start and size are "size[KkMm]"
 */
static int __init early_mem(char *p)
{
	static int usermem __initdata = 1;
	unsigned long size, start;
	char *endp;

	/*
	 * If the user specifies memory size, we
	 * blow away any automatically generated
	 * size.
	 */
	if (usermem) {
		usermem = 0;
		meminfo.nr_banks = 0;
	}

	start = PHYS_OFFSET;
	size  = memparse(p, &endp);
	if (*endp == '@')
		start = memparse(endp + 1, NULL);

	uc32_add_memory(start, size);

	return 0;
}
early_param("mem", early_mem);

static void __init
request_standard_resources(struct meminfo *mi)
{
	struct resource *res;
	int i;

	kernel_code.start   = virt_to_phys(_stext);
	kernel_code.end     = virt_to_phys(_etext - 1);
	kernel_data.start   = virt_to_phys(_sdata);
	kernel_data.end     = virt_to_phys(_end - 1);

	for (i = 0; i < mi->nr_banks; i++) {
		if (mi->bank[i].size == 0)
			continue;

		res = alloc_bootmem_low(sizeof(*res));
		res->name  = "System RAM";
		res->start = mi->bank[i].start;
		res->end   = mi->bank[i].start + mi->bank[i].size - 1;
		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

		request_resource(&iomem_resource, res);

		if (kernel_code.start >= res->start &&
		    kernel_code.end <= res->end)
			request_resource(res, &kernel_code);
		if (kernel_data.start >= res->start &&
		    kernel_data.end <= res->end)
			request_resource(res, &kernel_data);
	}
}

static void (*init_machine)(void) __initdata;

static int __init customize_machine(void)
{
	/* customizes platform devices, or adds new ones */
	if (init_machine)
		init_machine();
	return 0;
}
arch_initcall(customize_machine);

void __init setup_arch(char **cmdline_p)
{
	char *from = default_command_line;

	setup_processor();

	init_mm.start_code = (unsigned long) _stext;
	init_mm.end_code   = (unsigned long) _etext;
	init_mm.end_data   = (unsigned long) _edata;
	init_mm.brk	   = (unsigned long) _end;

	/* parse_early_param needs a boot_command_line */
	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);

	/* populate cmd_line too for later use, preserving boot_command_line */
	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
	*cmdline_p = cmd_line;

	parse_early_param();

	uc32_memblock_init(&meminfo);

	paging_init();
	request_standard_resources(&meminfo);

	cpu_init();

	/*
	 * Set up various architecture-specific pointers
	 */
	init_machine = puv3_core_init;

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
	early_trap_init();
}

static struct cpu cpuinfo_unicore;

static int __init topology_init(void)
{
	int i;

	for_each_possible_cpu(i)
		register_cpu(&cpuinfo_unicore, i);

	return 0;
}
subsys_initcall(topology_init);

#ifdef CONFIG_HAVE_PROC_CPU
static int __init proc_cpu_init(void)
{
	struct proc_dir_entry *res;

	res = proc_mkdir("cpu", NULL);
	if (!res)
		return -ENOMEM;
	return 0;
}
fs_initcall(proc_cpu_init);
#endif

static int c_show(struct seq_file *m, void *v)
{
	seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
		   (int)(uc32_cpuid >> 16) & 15, elf_platform);

	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
		   loops_per_jiffy / (500000/HZ),
		   (loops_per_jiffy / (5000/HZ)) % 100);

	/* dump out the processor features */
	seq_puts(m, "Features\t: CMOV UC-F64");

	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
	seq_printf(m, "CPU architecture: 2\n");
	seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);

	seq_printf(m, "Cache type\t: write-back\n"
			"Cache clean\t: cp0 c5 ops\n"
			"Cache lockdown\t: not support\n"
			"Cache format\t: Harvard\n");

	seq_puts(m, "\n");

	seq_printf(m, "Hardware\t: PKUnity v3\n");

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < 1 ? (void *)1 : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= c_show
};
Commit	Line	Data
141c943f G	1	/*
	2	* linux/arch/unicore32/kernel/setup.c
	3	*
	4	* Code specific to PKUnity SoC and UniCore ISA
	5	*
	6	* Copyright (C) 2001-2010 GUAN Xue-tao
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/stddef.h>
	15	#include <linux/ioport.h>
	16	#include <linux/delay.h>
	17	#include <linux/utsname.h>
	18	#include <linux/initrd.h>
	19	#include <linux/console.h>
	20	#include <linux/bootmem.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/screen_info.h>
	23	#include <linux/init.h>
	24	#include <linux/root_dev.h>
	25	#include <linux/cpu.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/smp.h>
	28	#include <linux/fs.h>
	29	#include <linux/proc_fs.h>
	30	#include <linux/memblock.h>
	31	#include <linux/elf.h>
	32	#include <linux/io.h>
	33
	34	#include <asm/cputype.h>
	35	#include <asm/sections.h>
	36	#include <asm/setup.h>
	37	#include <asm/cacheflush.h>
	38	#include <asm/tlbflush.h>
	39	#include <asm/traps.h>
1c16d242	40	#include <asm/memblock.h>
141c943f G	41
	42	#include "setup.h"
	43
	44	#ifndef MEM_SIZE
	45	#define MEM_SIZE (1610241024)
	46	#endif
	47
	48	struct stack {
	49	u32 irq[3];
	50	u32 abt[3];
	51	u32 und[3];
	52	} ____cacheline_aligned;
	53
	54	static struct stack stacks[NR_CPUS];
	55
f80561e4 CG	56	#ifdef CONFIG_VGA_CONSOLE
	57	struct screen_info screen_info;
	58	#endif
	59
141c943f G	60	char elf_platform[ELF_PLATFORM_SIZE];
	61	EXPORT_SYMBOL(elf_platform);
	62
	63	static char __initdata cmd_line[COMMAND_LINE_SIZE];
	64
	65	static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
	66
	67	/*
	68	* Standard memory resources
	69	*/
	70	static struct resource mem_res[] = {
141c943f	71	{
8c939402	72	.name = "Kernel code",
141c943f G	73	.start = 0,
141c943f G	74	.end = 0,
35d98e93	75	.flags = IORESOURCE_SYSTEM_RAM
141c943f G	76	},
	77	{
	78	.name = "Kernel data",
	79	.start = 0,
	80	.end = 0,
35d98e93	81	.flags = IORESOURCE_SYSTEM_RAM
141c943f G	82	}
	83	};
	84
6b794743 GX	85	#define kernel_code mem_res[0]
6b794743 GX	86	#define kernel_data mem_res[1]
141c943f G	87
	88	/*
	89	* These functions re-use the assembly code in head.S, which
	90	* already provide the required functionality.
	91	*/
	92	static void __init setup_processor(void)
	93	{
	94	printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
	95	uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
	96
	97	sprintf(init_utsname()->machine, "puv3");
	98	sprintf(elf_platform, "ucv2");
	99	}
	100
	101	/*
	102	* cpu_init - initialise one CPU.
	103	*
	104	* cpu_init sets up the per-CPU stacks.
	105	*/
	106	void cpu_init(void)
	107	{
	108	unsigned int cpu = smp_processor_id();
	109	struct stack *stk = &stacks[cpu];
	110
	111	/*
	112	* setup stacks for re-entrant exception handlers
	113	*/
	114	__asm__ (
	115	"mov.a asr, %1\n\t"
	116	"add sp, %0, %2\n\t"
	117	"mov.a asr, %3\n\t"
	118	"add sp, %0, %4\n\t"
	119	"mov.a asr, %5\n\t"
	120	"add sp, %0, %6\n\t"
	121	"mov.a asr, %7"
	122	:
	123	: "r" (stk),
	124	"r" (PSR_R_BIT \| PSR_I_BIT \| INTR_MODE),
	125	"I" (offsetof(struct stack, irq[0])),
	126	"r" (PSR_R_BIT \| PSR_I_BIT \| ABRT_MODE),
	127	"I" (offsetof(struct stack, abt[0])),
	128	"r" (PSR_R_BIT \| PSR_I_BIT \| EXTN_MODE),
	129	"I" (offsetof(struct stack, und[0])),
	130	"r" (PSR_R_BIT \| PSR_I_BIT \| PRIV_MODE)
	131	: "r30", "cc");
	132	}
	133
	134	static int __init uc32_add_memory(unsigned long start, unsigned long size)
	135	{
	136	struct membank *bank = &meminfo.bank[meminfo.nr_banks];
	137
	138	if (meminfo.nr_banks >= NR_BANKS) {
	139	printk(KERN_CRIT "NR_BANKS too low, "
	140	"ignoring memory at %#lx\n", start);
	141	return -EINVAL;
	142	}
	143
	144	/*
	145	* Ensure that start/size are aligned to a page boundary.
	146	* Size is appropriately rounded down, start is rounded up.
	147	*/
	148	size -= start & ~PAGE_MASK;
	149
	150	bank->start = PAGE_ALIGN(start);
151	bank->size = size & PAGE_MASK;
152
153	/*
154	* Check whether this memory region has non-zero size or
155	* invalid node number.
156	*/
157	if (bank->size == 0)
158	return -EINVAL;
159
160	meminfo.nr_banks++;
161	return 0;
162	}
163
164	/*
165	* Pick out the memory size. We look for mem=size@start,
166	* where start and size are "size[KkMm]"
167	*/
168	static int __init early_mem(char *p)
169	{
170	static int usermem __initdata = 1;
171	unsigned long size, start;
172	char *endp;
173
174	/*
175	* If the user specifies memory size, we
176	* blow away any automatically generated
177	* size.
178	*/
179	if (usermem) {
180	usermem = 0;
181	meminfo.nr_banks = 0;
182	}
183
184	start = PHYS_OFFSET;
185	size = memparse(p, &endp);
186	if (*endp == '@')
187	start = memparse(endp + 1, NULL);
188
189	uc32_add_memory(start, size);
190
191	return 0;
192	}
193	early_param("mem", early_mem);
194
195	static void __init
196	request_standard_resources(struct meminfo *mi)
197	{
198	struct resource *res;
199	int i;
200
201	kernel_code.start = virt_to_phys(_stext);
202	kernel_code.end = virt_to_phys(_etext - 1);
203	kernel_data.start = virt_to_phys(_sdata);
204	kernel_data.end = virt_to_phys(_end - 1);
205
206	for (i = 0; i < mi->nr_banks; i++) {
207	if (mi->bank[i].size == 0)
208	continue;
209
210	res = alloc_bootmem_low(sizeof(*res));
211	res->name = "System RAM";
212	res->start = mi->bank[i].start;
213	res->end = mi->bank[i].start + mi->bank[i].size - 1;
35d98e93	214	res->flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
141c943f G	215
	216	request_resource(&iomem_resource, res);
	217
	218	if (kernel_code.start >= res->start &&
	219	kernel_code.end <= res->end)
	220	request_resource(res, &kernel_code);
	221	if (kernel_data.start >= res->start &&
	222	kernel_data.end <= res->end)
	223	request_resource(res, &kernel_data);
	224	}
141c943f G	225	}
	226
	227	static void (*init_machine)(void) __initdata;
	228
	229	static int __init customize_machine(void)
	230	{
	231	/* customizes platform devices, or adds new ones */
	232	if (init_machine)
	233	init_machine();
	234	return 0;
	235	}
	236	arch_initcall(customize_machine);
	237
	238	void __init setup_arch(char **cmdline_p)
	239	{
	240	char *from = default_command_line;
	241
	242	setup_processor();
	243
	244	init_mm.start_code = (unsigned long) _stext;
	245	init_mm.end_code = (unsigned long) _etext;
	246	init_mm.end_data = (unsigned long) _edata;
	247	init_mm.brk = (unsigned long) _end;
	248
	249	/* parse_early_param needs a boot_command_line */
	250	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
	251
	252	/* populate cmd_line too for later use, preserving boot_command_line */
	253	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
	254	*cmdline_p = cmd_line;
	255
	256	parse_early_param();
	257
	258	uc32_memblock_init(&meminfo);
	259
	260	paging_init();
	261	request_standard_resources(&meminfo);
	262
	263	cpu_init();
	264
	265	/*
	266	* Set up various architecture-specific pointers
	267	*/
	268	init_machine = puv3_core_init;
	269
	270	#ifdef CONFIG_VT
	271	#if defined(CONFIG_VGA_CONSOLE)
	272	conswitchp = &vga_con;
	273	#elif defined(CONFIG_DUMMY_CONSOLE)
	274	conswitchp = &dummy_con;
	275	#endif
	276	#endif
	277	early_trap_init();
	278	}
	279
	280	static struct cpu cpuinfo_unicore;
	281
	282	static int __init topology_init(void)
	283	{
	284	int i;
	285
	286	for_each_possible_cpu(i)
	287	register_cpu(&cpuinfo_unicore, i);
	288
289	return 0;
290	}
291	subsys_initcall(topology_init);
292
293	#ifdef CONFIG_HAVE_PROC_CPU
294	static int __init proc_cpu_init(void)
295	{
296	struct proc_dir_entry *res;
297
298	res = proc_mkdir("cpu", NULL);
299	if (!res)
300	return -ENOMEM;
301	return 0;
302	}
303	fs_initcall(proc_cpu_init);
304	#endif
305
306	static int c_show(struct seq_file m, void v)
307	{
308	seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
309	(int)(uc32_cpuid >> 16) & 15, elf_platform);
310
311	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
312	loops_per_jiffy / (500000/HZ),
313	(loops_per_jiffy / (5000/HZ)) % 100);
314
315	/* dump out the processor features */
316	seq_puts(m, "Features\t: CMOV UC-F64");
317
318	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
319	seq_printf(m, "CPU architecture: 2\n");
320	seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
321
322	seq_printf(m, "Cache type\t: write-back\n"
323	"Cache clean\t: cp0 c5 ops\n"
324	"Cache lockdown\t: not support\n"
325	"Cache format\t: Harvard\n");
326
327	seq_puts(m, "\n");
328
329	seq_printf(m, "Hardware\t: PKUnity v3\n");
330
331	return 0;
332	}
333
334	static void c_start(struct seq_file m, loff_t *pos)
335	{
336	return pos < 1 ? (void )1 : NULL;
337	}
338
339	static void c_next(struct seq_file m, void v, loff_t pos)
340	{
341	++*pos;
342	return NULL;
343	}
344
345	static void c_stop(struct seq_file m, void v)
346	{
347	}
348
349	const struct seq_operations cpuinfo_op = {
350	.start = c_start,
351	.next = c_next,
352	.stop = c_stop,
353	.show = c_show
354	};