mirror of https://gitee.com/openkylin/linux.git
OpenRISC: Boot code
Architecture code and early setup routines for booting Linux. Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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Jonas Bonn
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82ed223c26
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9d02a4283e
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Load Diff
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/*
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* OpenRISC init_task.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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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 License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init_task.h>
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#include <linux/mqueue.h>
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static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
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static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
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/*
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* Initial thread structure.
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*
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* We need to make sure that this is THREAD_SIZE aligned due to the
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* way process stacks are handled. This is done by having a special
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* "init_task" linker map entry..
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*/
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union thread_union init_thread_union __init_task_data = {
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INIT_THREAD_INFO(init_task)
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};
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/*
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* Initial task structure.
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*
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* All other task structs will be allocated on slabs in fork.c
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*/
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struct task_struct init_task = INIT_TASK(init_task);
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EXPORT_SYMBOL(init_task);
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/*
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* OpenRISC setup.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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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 License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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#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/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/console.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 <linux/serial.h>
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <linux/of.h>
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#include <linux/memblock.h>
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#include <linux/device.h>
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#include <linux/of_platform.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/types.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/cpuinfo.h>
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#include <asm/delay.h>
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#include "vmlinux.h"
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char __initdata cmd_line[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
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static unsigned long __init setup_memory(void)
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{
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unsigned long bootmap_size;
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unsigned long ram_start_pfn;
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unsigned long free_ram_start_pfn;
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unsigned long ram_end_pfn;
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phys_addr_t memory_start, memory_end;
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struct memblock_region *region;
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memory_end = memory_start = 0;
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/* Find main memory where is the kernel */
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for_each_memblock(memory, region) {
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memory_start = region->base;
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memory_end = region->base + region->size;
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printk(KERN_INFO "%s: Memory: 0x%x-0x%x\n", __func__,
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memory_start, memory_end);
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}
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if (!memory_end) {
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panic("No memory!");
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}
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ram_start_pfn = PFN_UP(memory_start);
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/* free_ram_start_pfn is first page after kernel */
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free_ram_start_pfn = PFN_UP(__pa(&_end));
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ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
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max_pfn = ram_end_pfn;
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/*
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* initialize the boot-time allocator (with low memory only).
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*
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* This makes the memory from the end of the kernel to the end of
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* RAM usable.
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* init_bootmem sets the global values min_low_pfn, max_low_pfn.
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*/
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bootmap_size = init_bootmem(free_ram_start_pfn,
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ram_end_pfn - ram_start_pfn);
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free_bootmem(PFN_PHYS(free_ram_start_pfn),
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(ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
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reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
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BOOTMEM_DEFAULT);
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for_each_memblock(reserved, region) {
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printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
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(u32) region->base, (u32) region->size);
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reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
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}
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return ram_end_pfn;
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}
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struct cpuinfo cpuinfo;
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static void print_cpuinfo(void)
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{
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unsigned long upr = mfspr(SPR_UPR);
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unsigned long vr = mfspr(SPR_VR);
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unsigned int version;
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unsigned int revision;
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version = (vr & SPR_VR_VER) >> 24;
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revision = (vr & SPR_VR_REV);
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printk(KERN_INFO "CPU: OpenRISC-%x (revision %d) @%d MHz\n",
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version, revision, cpuinfo.clock_frequency / 1000000);
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if (!(upr & SPR_UPR_UP)) {
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printk(KERN_INFO
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"-- no UPR register... unable to detect configuration\n");
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return;
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}
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if (upr & SPR_UPR_DCP)
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printk(KERN_INFO
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"-- dcache: %4d bytes total, %2d bytes/line, %d way(s)\n",
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cpuinfo.dcache_size, cpuinfo.dcache_block_size, 1);
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else
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printk(KERN_INFO "-- dcache disabled\n");
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if (upr & SPR_UPR_ICP)
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printk(KERN_INFO
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"-- icache: %4d bytes total, %2d bytes/line, %d way(s)\n",
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cpuinfo.icache_size, cpuinfo.icache_block_size, 1);
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else
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printk(KERN_INFO "-- icache disabled\n");
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if (upr & SPR_UPR_DMP)
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printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n",
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1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
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1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW));
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if (upr & SPR_UPR_IMP)
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printk(KERN_INFO "-- immu: %4d entries, %lu way(s)\n",
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1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
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1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW));
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printk(KERN_INFO "-- additional features:\n");
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if (upr & SPR_UPR_DUP)
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printk(KERN_INFO "-- debug unit\n");
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if (upr & SPR_UPR_PCUP)
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printk(KERN_INFO "-- performance counters\n");
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if (upr & SPR_UPR_PMP)
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printk(KERN_INFO "-- power management\n");
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if (upr & SPR_UPR_PICP)
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printk(KERN_INFO "-- PIC\n");
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if (upr & SPR_UPR_TTP)
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printk(KERN_INFO "-- timer\n");
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if (upr & SPR_UPR_CUP)
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printk(KERN_INFO "-- custom unit(s)\n");
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}
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void __init setup_cpuinfo(void)
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{
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struct device_node *cpu;
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unsigned long iccfgr, dccfgr;
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unsigned long cache_set_size, cache_ways;
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cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
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if (!cpu)
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panic("No compatible CPU found in device tree...\n");
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iccfgr = mfspr(SPR_ICCFGR);
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cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
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cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
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cpuinfo.icache_block_size = 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7);
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cpuinfo.icache_size =
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cache_set_size * cache_ways * cpuinfo.icache_block_size;
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dccfgr = mfspr(SPR_DCCFGR);
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cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
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cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
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cpuinfo.dcache_block_size = 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7);
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cpuinfo.dcache_size =
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cache_set_size * cache_ways * cpuinfo.dcache_block_size;
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if (of_property_read_u32(cpu, "clock-frequency",
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&cpuinfo.clock_frequency)) {
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printk(KERN_WARNING
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"Device tree missing CPU 'clock-frequency' parameter."
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"Assuming frequency 25MHZ"
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"This is probably not what you want.");
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}
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of_node_put(cpu);
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print_cpuinfo();
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}
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/**
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* or32_early_setup
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*
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* Handles the pointer to the device tree that this kernel is to use
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* for establishing the available platform devices.
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*
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* For now, this is limited to using the built-in device tree. In the future,
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* it is intended that this function will take a pointer to the device tree
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* that is potentially built-in, but potentially also passed in by the
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* bootloader, or discovered by some equally clever means...
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*/
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void __init or32_early_setup(void)
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{
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early_init_devtree(__dtb_start);
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printk(KERN_INFO "Compiled-in FDT at 0x%p\n", __dtb_start);
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}
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static int __init openrisc_device_probe(void)
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{
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of_platform_populate(NULL, NULL, NULL, NULL);
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return 0;
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}
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device_initcall(openrisc_device_probe);
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static inline unsigned long extract_value_bits(unsigned long reg,
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short bit_nr, short width)
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{
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return (reg >> bit_nr) & (0 << width);
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}
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static inline unsigned long extract_value(unsigned long reg, unsigned long mask)
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{
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while (!(mask & 0x1)) {
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reg = reg >> 1;
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mask = mask >> 1;
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}
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return mask & reg;
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}
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void __init detect_unit_config(unsigned long upr, unsigned long mask,
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char *text, void (*func) (void))
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{
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if (text != NULL)
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printk("%s", text);
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if (upr & mask) {
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if (func != NULL)
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func();
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else
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printk("present\n");
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} else
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printk("not present\n");
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}
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/*
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* calibrate_delay
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*
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* Lightweight calibrate_delay implementation that calculates loops_per_jiffy
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* from the clock frequency passed in via the device tree
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*
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*/
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void __cpuinit calibrate_delay(void)
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{
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const int *val;
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struct device_node *cpu = NULL;
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cpu = of_find_compatible_node(NULL, NULL, "opencores,or1200-rtlsvn481");
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val = of_get_property(cpu, "clock-frequency", NULL);
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if (!val)
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panic("no cpu 'clock-frequency' parameter in device tree");
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loops_per_jiffy = *val / HZ;
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pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
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loops_per_jiffy / (500000 / HZ),
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(loops_per_jiffy / (5000 / HZ)) % 100, loops_per_jiffy);
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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 max_low_pfn;
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unflatten_device_tree();
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setup_cpuinfo();
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/* process 1's initial memory region is the kernel code/data */
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init_mm.start_code = (unsigned long)&_stext;
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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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#ifdef CONFIG_BLK_DEV_INITRD
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initrd_start = (unsigned long)&__initrd_start;
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initrd_end = (unsigned long)&__initrd_end;
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if (initrd_start == initrd_end) {
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initrd_start = 0;
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initrd_end = 0;
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}
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initrd_below_start_ok = 1;
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#endif
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/* setup bootmem allocator */
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max_low_pfn = setup_memory();
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/* paging_init() sets up the MMU and marks all pages as reserved */
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paging_init();
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#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
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if (!conswitchp)
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conswitchp = &dummy_con;
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#endif
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*cmdline_p = cmd_line;
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printk(KERN_INFO "OpenRISC Linux -- http://openrisc.net\n");
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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 vr;
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int version, revision;
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vr = mfspr(SPR_VR);
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version = (vr & SPR_VR_VER) >> 24;
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revision = vr & SPR_VR_REV;
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return seq_printf(m,
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"cpu\t\t: OpenRISC-%x\n"
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"revision\t: %d\n"
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"frequency\t: %ld\n"
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"dcache size\t: %d bytes\n"
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"dcache block size\t: %d bytes\n"
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"icache size\t: %d bytes\n"
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"icache block size\t: %d bytes\n"
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"immu\t\t: %d entries, %lu ways\n"
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"dmmu\t\t: %d entries, %lu ways\n"
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"bogomips\t: %lu.%02lu\n",
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version,
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revision,
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loops_per_jiffy * HZ,
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cpuinfo.dcache_size,
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cpuinfo.dcache_block_size,
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cpuinfo.icache_size,
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cpuinfo.icache_block_size,
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1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2),
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1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW),
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1 << ((mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTS) >> 2),
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1 + (mfspr(SPR_IMMUCFGR) & SPR_IMMUCFGR_NTW),
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(loops_per_jiffy * HZ) / 500000,
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((loops_per_jiffy * HZ) / 5000) % 100);
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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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/* We only have one CPU... */
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return *pos < 1 ? (void *)1 : 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 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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const 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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