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385 lines
9.7 KiB
385 lines
9.7 KiB
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* arch/sh64/kernel/setup.c
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*
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* sh64 Arch Support
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*
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* This file handles the architecture-dependent parts of initialization
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003, 2004 Paul Mundt
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*
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* benedict.gaster@superh.com: 2nd May 2002
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* Modified to use the empty_zero_page to pass command line arguments.
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*
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* benedict.gaster@superh.com: 3rd May 2002
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* Added support for ramdisk, removing statically linked romfs at the same time.
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*
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* lethal@linux-sh.org: 15th May 2003
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* Added generic procfs cpuinfo reporting. Make boards just export their name.
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*
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* lethal@linux-sh.org: 25th May 2003
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* Added generic get_cpu_subtype() for subtype reporting from cpu_data->type.
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*
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*/
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#include <linux/errno.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/blkdev.h>
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#include <linux/bootmem.h>
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#include <linux/console.h>
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#include <linux/root_dev.h>
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#include <linux/cpu.h>
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#include <linux/initrd.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/platform.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/smp.h>
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#ifdef CONFIG_VT
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#include <linux/console.h>
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#endif
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struct screen_info screen_info;
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#ifdef CONFIG_BLK_DEV_RAM
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extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
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extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
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extern int rd_image_start; /* starting block # of image */
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#endif
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extern int root_mountflags;
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extern char *get_system_type(void);
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extern void platform_setup(void);
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extern void platform_monitor(void);
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extern void platform_reserve(void);
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extern int sh64_cache_init(void);
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extern int sh64_tlb_init(void);
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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static char command_line[COMMAND_LINE_SIZE] = { 0, };
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unsigned long long memory_start = CONFIG_MEMORY_START;
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unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024);
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struct sh_cpuinfo boot_cpu_data;
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static inline void parse_mem_cmdline (char ** cmdline_p)
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{
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char c = ' ', *to = command_line, *from = COMMAND_LINE;
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int len = 0;
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/* Save unparsed command line copy for /proc/cmdline */
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memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
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saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
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for (;;) {
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/*
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* "mem=XXX[kKmM]" defines a size of memory.
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*/
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if (c == ' ' && !memcmp(from, "mem=", 4)) {
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if (to != command_line)
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to--;
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{
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unsigned long mem_size;
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mem_size = memparse(from+4, &from);
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memory_end = memory_start + mem_size;
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}
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}
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c = *(from++);
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if (!c)
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break;
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if (COMMAND_LINE_SIZE <= ++len)
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break;
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*(to++) = c;
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}
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*to = '\0';
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*cmdline_p = command_line;
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}
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static void __init sh64_cpu_type_detect(void)
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{
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extern unsigned long long peek_real_address_q(unsigned long long addr);
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unsigned long long cir;
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/* Do peeks in real mode to avoid having to set up a mapping for the
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WPC registers. On SH5-101 cut2, such a mapping would be exposed to
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an address translation erratum which would make it hard to set up
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correctly. */
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cir = peek_real_address_q(0x0d000008);
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if ((cir & 0xffff) == 0x5103) {
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boot_cpu_data.type = CPU_SH5_103;
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} else if (((cir >> 32) & 0xffff) == 0x51e2) {
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/* CPU.VCR aliased at CIR address on SH5-101 */
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boot_cpu_data.type = CPU_SH5_101;
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} else {
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boot_cpu_data.type = CPU_SH_NONE;
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}
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}
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void __init setup_arch(char **cmdline_p)
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{
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unsigned long bootmap_size, i;
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unsigned long first_pfn, start_pfn, last_pfn, pages;
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#ifdef CONFIG_EARLY_PRINTK
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extern void enable_early_printk(void);
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/*
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* Setup Early SCIF console
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*/
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enable_early_printk();
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#endif
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/*
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* Setup TLB mappings
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*/
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sh64_tlb_init();
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/*
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* Caches are already initialized by the time we get here, so we just
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* fill in cpu_data info for the caches.
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*/
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sh64_cache_init();
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platform_setup();
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platform_monitor();
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sh64_cpu_type_detect();
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ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
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#ifdef CONFIG_BLK_DEV_RAM
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rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
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rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
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rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
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#endif
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if (!MOUNT_ROOT_RDONLY)
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root_mountflags &= ~MS_RDONLY;
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init_mm.start_code = (unsigned long) _text;
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init_mm.end_code = (unsigned long) _etext;
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init_mm.end_data = (unsigned long) _edata;
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init_mm.brk = (unsigned long) _end;
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code_resource.start = __pa(_text);
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code_resource.end = __pa(_etext)-1;
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data_resource.start = __pa(_etext);
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data_resource.end = __pa(_edata)-1;
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parse_mem_cmdline(cmdline_p);
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/*
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* Find the lowest and highest page frame numbers we have available
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*/
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first_pfn = PFN_DOWN(memory_start);
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last_pfn = PFN_DOWN(memory_end);
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pages = last_pfn - first_pfn;
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/*
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* Partially used pages are not usable - thus
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* we are rounding upwards:
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*/
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start_pfn = PFN_UP(__pa(_end));
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/*
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* Find a proper area for the bootmem bitmap. After this
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* bootstrap step all allocations (until the page allocator
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* is intact) must be done via bootmem_alloc().
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*/
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bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
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first_pfn,
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last_pfn);
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/*
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* Round it up.
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*/
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bootmap_size = PFN_PHYS(PFN_UP(bootmap_size));
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/*
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* Register fully available RAM pages with the bootmem allocator.
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*/
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free_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), PFN_PHYS(pages));
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/*
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* Reserve all kernel sections + bootmem bitmap + a guard page.
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*/
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reserve_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn),
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(PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE) - PFN_PHYS(first_pfn));
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/*
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* Reserve platform dependent sections
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*/
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platform_reserve();
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#ifdef CONFIG_BLK_DEV_INITRD
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if (LOADER_TYPE && INITRD_START) {
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if (INITRD_START + INITRD_SIZE <= (PFN_PHYS(last_pfn))) {
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reserve_bootmem_node(NODE_DATA(0), INITRD_START + __MEMORY_START, INITRD_SIZE);
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initrd_start =
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(long) INITRD_START ? INITRD_START + PAGE_OFFSET + __MEMORY_START : 0;
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initrd_end = initrd_start + INITRD_SIZE;
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} else {
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printk("initrd extends beyond end of memory "
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"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
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(long) INITRD_START + INITRD_SIZE,
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PFN_PHYS(last_pfn));
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initrd_start = 0;
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}
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}
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#endif
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/*
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* Claim all RAM, ROM, and I/O resources.
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*/
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/* Kernel RAM */
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request_resource(&iomem_resource, &code_resource);
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request_resource(&iomem_resource, &data_resource);
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/* Other KRAM space */
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for (i = 0; i < STANDARD_KRAM_RESOURCES - 2; i++)
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request_resource(&iomem_resource,
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&platform_parms.kram_res_p[i]);
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/* XRAM space */
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for (i = 0; i < STANDARD_XRAM_RESOURCES; i++)
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request_resource(&iomem_resource,
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&platform_parms.xram_res_p[i]);
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/* ROM space */
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for (i = 0; i < STANDARD_ROM_RESOURCES; i++)
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request_resource(&iomem_resource,
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&platform_parms.rom_res_p[i]);
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/* I/O space */
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for (i = 0; i < STANDARD_IO_RESOURCES; i++)
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request_resource(&ioport_resource,
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&platform_parms.io_res_p[i]);
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#ifdef CONFIG_VT
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#if defined(CONFIG_VGA_CONSOLE)
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conswitchp = &vga_con;
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#elif defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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#endif
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printk("Hardware FPU: %s\n", fpu_in_use ? "enabled" : "disabled");
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paging_init();
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}
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void __xchg_called_with_bad_pointer(void)
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{
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printk(KERN_EMERG "xchg() called with bad pointer !\n");
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}
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static struct cpu cpu[1];
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static int __init topology_init(void)
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{
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return register_cpu(cpu, 0, NULL);
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}
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subsys_initcall(topology_init);
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/*
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* Get CPU information
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*/
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static const char *cpu_name[] = {
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[CPU_SH5_101] = "SH5-101",
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[CPU_SH5_103] = "SH5-103",
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[CPU_SH_NONE] = "Unknown",
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};
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const char *get_cpu_subtype(void)
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{
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return cpu_name[boot_cpu_data.type];
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}
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#ifdef CONFIG_PROC_FS
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static int show_cpuinfo(struct seq_file *m,void *v)
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{
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unsigned int cpu = smp_processor_id();
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if (!cpu)
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seq_printf(m, "machine\t\t: %s\n", get_system_type());
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seq_printf(m, "processor\t: %d\n", cpu);
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seq_printf(m, "cpu family\t: SH-5\n");
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seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());
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seq_printf(m, "icache size\t: %dK-bytes\n",
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(boot_cpu_data.icache.ways *
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boot_cpu_data.icache.sets *
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boot_cpu_data.icache.linesz) >> 10);
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seq_printf(m, "dcache size\t: %dK-bytes\n",
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(boot_cpu_data.dcache.ways *
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boot_cpu_data.dcache.sets *
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boot_cpu_data.dcache.linesz) >> 10);
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seq_printf(m, "itlb entries\t: %d\n", boot_cpu_data.itlb.entries);
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seq_printf(m, "dtlb entries\t: %d\n", boot_cpu_data.dtlb.entries);
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#define PRINT_CLOCK(name, value) \
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seq_printf(m, name " clock\t: %d.%02dMHz\n", \
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((value) / 1000000), ((value) % 1000000)/10000)
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PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock);
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PRINT_CLOCK("bus", boot_cpu_data.bus_clock);
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PRINT_CLOCK("module", boot_cpu_data.module_clock);
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seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
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(loops_per_jiffy*HZ+2500)/500000,
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((loops_per_jiffy*HZ+2500)/5000) % 100);
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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return (void*)(*pos == 0);
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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return NULL;
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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#endif /* CONFIG_PROC_FS */
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