294 lines
6.8 KiB
C
294 lines
6.8 KiB
C
/* MN10300 Arch-specific initialisation
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/errno.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/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/seq_file.h>
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#include <asm/processor.h>
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#include <linux/console.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <proc/proc.h>
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#include <asm/busctl-regs.h>
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#include <asm/fpu.h>
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#include <asm/sections.h>
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struct mn10300_cpuinfo boot_cpu_data;
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/* For PCI or other memory-mapped resources */
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unsigned long pci_mem_start = 0x18000000;
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char redboot_command_line[COMMAND_LINE_SIZE] =
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"console=ttyS0,115200 root=/dev/mtdblock3 rw";
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char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
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static struct resource code_resource = {
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.start = 0x100000,
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.end = 0,
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.name = "Kernel code",
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};
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static struct resource data_resource = {
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.start = 0,
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.end = 0,
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.name = "Kernel data",
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};
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static unsigned long __initdata phys_memory_base;
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static unsigned long __initdata phys_memory_end;
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static unsigned long __initdata memory_end;
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unsigned long memory_size;
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struct thread_info *__current_ti = &init_thread_union.thread_info;
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struct task_struct *__current = &init_task;
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#define mn10300_known_cpus 3
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static const char *const mn10300_cputypes[] = {
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"am33v1",
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"am33v2",
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"am34v1",
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"unknown"
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};
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/*
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*
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*/
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static void __init parse_mem_cmdline(char **cmdline_p)
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{
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char *from, *to, c;
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/* save unparsed command line copy for /proc/cmdline */
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strcpy(boot_command_line, redboot_command_line);
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/* see if there's an explicit memory size option */
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from = redboot_command_line;
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to = redboot_command_line;
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c = ' ';
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for (;;) {
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if (c == ' ' && !memcmp(from, "mem=", 4)) {
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if (to != redboot_command_line)
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to--;
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memory_size = memparse(from + 4, &from);
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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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*(to++) = c;
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}
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*to = '\0';
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*cmdline_p = redboot_command_line;
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if (memory_size == 0)
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panic("Memory size not known\n");
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memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
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memory_size;
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if (memory_end > phys_memory_end)
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memory_end = phys_memory_end;
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}
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/*
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* architecture specific setup
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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;
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unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
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cpu_init();
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unit_setup();
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parse_mem_cmdline(cmdline_p);
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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 = virt_to_bus(&_text);
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code_resource.end = virt_to_bus(&_etext)-1;
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data_resource.start = virt_to_bus(&_etext);
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data_resource.end = virt_to_bus(&_edata)-1;
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start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
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kstart_pfn = PFN_UP(__pa(&_text));
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free_pfn = PFN_UP(__pa(&_end));
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end_pfn = PFN_DOWN(__pa(memory_end));
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bootmap_size = init_bootmem_node(&contig_page_data,
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free_pfn,
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start_pfn,
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end_pfn);
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if (kstart_pfn > start_pfn)
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free_bootmem(PFN_PHYS(start_pfn),
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PFN_PHYS(kstart_pfn - start_pfn));
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free_bootmem(PFN_PHYS(free_pfn),
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PFN_PHYS(end_pfn - free_pfn));
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/* If interrupt vector table is in main ram, then we need to
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reserve the page it is occupying. */
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if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
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CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
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reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
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BOOTMEM_DEFAULT);
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reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
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BOOTMEM_DEFAULT);
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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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paging_init();
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}
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/*
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* perform CPU initialisation
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*/
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void __init cpu_init(void)
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{
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unsigned long cpurev = CPUREV, type;
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unsigned long base, size;
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type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
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if (type > mn10300_known_cpus)
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type = mn10300_known_cpus;
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printk(KERN_INFO "Matsushita %s, rev %ld\n",
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mn10300_cputypes[type],
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(cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
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/* determine the memory size and base from the memory controller regs */
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memory_size = 0;
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base = SDBASE(0);
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if (base & SDBASE_CE) {
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size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
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size = ~size + 1;
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base &= SDBASE_CBA;
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printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
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memory_size += size;
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phys_memory_base = base;
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}
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base = SDBASE(1);
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if (base & SDBASE_CE) {
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size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
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size = ~size + 1;
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base &= SDBASE_CBA;
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printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
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memory_size += size;
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if (phys_memory_base == 0)
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phys_memory_base = base;
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}
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phys_memory_end = phys_memory_base + memory_size;
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#ifdef CONFIG_FPU
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fpu_init_state();
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#endif
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}
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/*
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* Get CPU information for use by the procfs.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
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type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
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if (type > mn10300_known_cpus)
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type = mn10300_known_cpus;
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icachesz =
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((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S) *
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((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
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1024;
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dcachesz =
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((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S) *
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((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
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1024;
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seq_printf(m,
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"processor : 0\n"
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"vendor_id : Matsushita\n"
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"cpu core : %s\n"
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"cpu rev : %lu\n"
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"model name : " PROCESSOR_MODEL_NAME "\n"
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"icache size: %lu\n"
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"dcache size: %lu\n",
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mn10300_cputypes[type],
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(cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
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icachesz,
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dcachesz
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);
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seq_printf(m,
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"ioclk speed: %lu.%02luMHz\n"
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"bogomips : %lu.%02lu\n\n",
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MN10300_IOCLK / 1000000,
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(MN10300_IOCLK / 10000) % 100,
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loops_per_jiffy / (500000 / HZ),
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(loops_per_jiffy / (5000 / HZ)) % 100
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);
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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 *pos < NR_CPUS ? cpu_data + *pos : NULL;
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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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++*pos;
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return c_start(m, pos);
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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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