Commit c121c506 authored by Vineet Gupta's avatar Vineet Gupta

ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem init

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 1162b070
......@@ -23,7 +23,9 @@ config ARC
select GENERIC_SIGALTSTACK
select GENERIC_SMP_IDLE_THREAD
select HAVE_GENERIC_HARDIRQS
select HAVE_MEMBLOCK
select MODULES_USE_ELF_RELA
select NO_BOOTMEM
config SCHED_OMIT_FRAME_POINTER
def_bool y
......
......@@ -258,6 +258,11 @@
} \
}
/* Helpers */
#define TO_KB(bytes) ((bytes) >> 10)
#define TO_MB(bytes) (TO_KB(bytes) >> 10)
#define PAGES_TO_KB(n_pages) ((n_pages) << (PAGE_SHIFT - 10))
#define PAGES_TO_MB(n_pages) (PAGES_TO_KB(n_pages) >> 10)
#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
/* These DPFP regs need to be saved/restored across ctx-sw */
......
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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.
*/
#ifndef __ASMARC_SETUP_H
#define __ASMARC_SETUP_H
#include <linux/types.h>
#define COMMAND_LINE_SIZE 256
extern int root_mountflags, end_mem;
extern int running_on_hw;
void __init setup_processor(void);
void __init setup_arch_memory(void);
#endif /* __ASMARC_SETUP_H */
/*
* ARC CPU startup Code
*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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.
*
* Vineetg: Dec 2007
* -Check if we are running on Simulator or on real hardware
* to skip certain things during boot on simulator
*/
#include <asm/asm-offsets.h>
#include <asm/entry.h>
#include <linux/linkage.h>
#include <asm/arcregs.h>
.cpu A7
.section .init.text, "ax",@progbits
.type stext, @function
.globl stext
stext:
;-------------------------------------------------------------------
; Don't clobber r0-r4 yet. It might have bootloader provided info
;-------------------------------------------------------------------
; Clear BSS before updating any globals
; XXX: use ZOL here
mov r5, __bss_start
mov r6, __bss_stop
1:
st.ab 0, [r5,4]
brlt r5, r6, 1b
#ifdef CONFIG_CMDLINE_UBOOT
; support for bootloader provided cmdline
; If cmdline passed by u-boot, then
; r0 = 1 (because ATAGS parsing, now retired, used to use 0)
; r1 = magic number (board identity)
; r2 = addr of cmdline string (somewhere in memory/flash)
brne r0, 1, .Lother_bootup_chores ; u-boot didn't pass cmdline
breq r2, 0, .Lother_bootup_chores ; or cmdline is NULL
mov r5, @command_line
1:
ldb.ab r6, [r2, 1]
breq r6, 0, .Lother_bootup_chores
b.d 1b
stb.ab r6, [r5, 1]
#endif
.Lother_bootup_chores:
; Identify if running on ISS vs Silicon
; IDENTITY Reg [ 3 2 1 0 ]
; (chip-id) ^^^^^ ==> 0xffff for ISS
lr r0, [identity]
lsr r3, r0, 16
cmp r3, 0xffff
mov.z r4, 0
mov.nz r4, 1
st r4, [@running_on_hw]
; setup "current" tsk and optionally cache it in dedicated r25
mov r9, @init_task
SET_CURR_TASK_ON_CPU r9, r0 ; r9 = tsk, r0 = scratch
; setup stack (fp, sp)
mov fp, 0
; tsk->thread_info is really a PAGE, whose bottom hoists stack
GET_TSK_STACK_BASE r9, sp ; r9 = tsk, sp = stack base(output)
j start_kernel ; "C" entry point
/*
* Copyright (C) 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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/kernel.h>
#include <linux/printk.h>
#include <linux/reboot.h>
#include <linux/pm.h>
void machine_halt(void)
{
/* Halt the processor */
__asm__ __volatile__("flag 1\n");
}
void machine_restart(char *__unused)
{
/* Soft reset : jump to reset vector */
pr_info("Put your restart handler here\n");
machine_halt();
}
void machine_power_off(void)
{
/* FIXME :: power off ??? */
machine_halt();
}
void (*pm_power_off) (void) = NULL;
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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/seq_file.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <asm/arcregs.h>
#include <asm/tlb.h>
#include <asm/cache.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/arcregs.h>
#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
int running_on_hw = 1; /* vs. on ISS */
char __initdata command_line[COMMAND_LINE_SIZE];
struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
void __init read_arc_build_cfg_regs(void)
{
read_decode_mmu_bcr();
read_decode_cache_bcr();
}
/*
* Initialize and setup the processor core
* This is called by all the CPUs thus should not do special case stuff
* such as only for boot CPU etc
*/
void __init setup_processor(void)
{
read_arc_build_cfg_regs();
arc_init_IRQ();
arc_mmu_init();
arc_cache_init();
}
void __init __attribute__((weak)) arc_platform_early_init(void)
{
}
void __init setup_arch(char **cmdline_p)
{
#ifdef CONFIG_CMDLINE_UBOOT
/* Make sure that a whitespace is inserted before */
strlcat(command_line, " ", sizeof(command_line));
#endif
/*
* Append .config cmdline to base command line, which might already
* contain u-boot "bootargs" (handled by head.S, if so configured)
*/
strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
/* Save unparsed command line copy for /proc/cmdline */
strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
/* To force early parsing of things like mem=xxx */
parse_early_param();
/* Platform/board specific: e.g. early console registration */
arc_platform_early_init();
setup_processor();
setup_arch_memory();
/* Can be issue if someone passes cmd line arg "ro"
* But that is unlikely so keeping it as it is
*/
root_mountflags &= ~MS_RDONLY;
console_verbose();
#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
}
/*
* Get CPU information for use by the procfs.
*/
#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
static int show_cpuinfo(struct seq_file *m, void *v)
{
char *str;
int cpu_id = ptr_to_cpu(v);
str = (char *)__get_free_page(GFP_TEMPORARY);
if (!str)
goto done;
seq_printf(m, "ARC700 #%d\n", cpu_id);
seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
loops_per_jiffy / (500000 / HZ),
(loops_per_jiffy / (5000 / HZ)) % 100);
free_page((unsigned long)str);
done:
seq_printf(m, "\n\n");
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
/*
* Callback returns cpu-id to iterator for show routine, NULL to stop.
* However since NULL is also a valid cpu-id (0), we use a round-about
* way to pass it w/o having to kmalloc/free a 2 byte string.
* Encode cpu-id as 0xFFcccc, which is decoded by show routine.
*/
return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
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 = show_cpuinfo
};
static DEFINE_PER_CPU(struct cpu, cpu_topology);
static int __init topology_init(void)
{
int cpu;
for_each_present_cpu(cpu)
register_cpu(&per_cpu(cpu_topology, cpu), cpu);
return 0;
}
subsys_initcall(topology_init);
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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/kernel.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#ifdef CONFIG_BLOCK_DEV_RAM
#include <linux/blk.h>
#endif
#include <linux/swap.h>
#include <linux/module.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>
#include <asm/arcregs.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
EXPORT_SYMBOL(empty_zero_page);
/* Default tot mem from .config */
static unsigned long arc_mem_sz = CONFIG_ARC_PLAT_SDRAM_SIZE;
/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
static int __init setup_mem_sz(char *str)
{
arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
/* early console might not be setup yet - it will show up later */
pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
return 0;
}
early_param("mem", setup_mem_sz);
/*
* First memory setup routine called from setup_arch()
* 1. setup swapper's mm @init_mm
* 2. Count the pages we have and setup bootmem allocator
* 3. zone setup
*/
void __init setup_arch_memory(void)
{
unsigned long zones_size[MAX_NR_ZONES] = { 0, 0 };
unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
init_mm.start_code = (unsigned long)_text;
init_mm.end_code = (unsigned long)_etext;
init_mm.end_data = (unsigned long)_edata;
init_mm.brk = (unsigned long)_end;
/*
* We do it here, so that memory is correctly instantiated
* even if "mem=xxx" cmline over-ride is not given
*/
memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
/*------------- externs in mm need setting up ---------------*/
/* first page of system - kernel .vector starts here */
min_low_pfn = PFN_DOWN(CONFIG_LINUX_LINK_BASE);
/* Last usable page of low mem (no HIGHMEM yet for ARC port) */
max_low_pfn = max_pfn = PFN_DOWN(end_mem);
max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
/*------------- reserve kernel image -----------------------*/
memblock_reserve(CONFIG_LINUX_LINK_BASE,
__pa(_end) - CONFIG_LINUX_LINK_BASE);
memblock_dump_all();
/*-------------- node setup --------------------------------*/
memset(zones_size, 0, sizeof(zones_size));
zones_size[ZONE_NORMAL] = num_physpages;
/*
* We can't use the helper free_area_init(zones[]) because it uses
* PAGE_OFFSET to compute the @min_low_pfn which would be wrong
* when our kernel doesn't start at PAGE_OFFSET, i.e.
* PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
*/
free_area_init_node(0, /* node-id */
zones_size, /* num pages per zone */
min_low_pfn, /* first pfn of node */
NULL); /* NO holes */
}
/*
* mem_init - initializes memory
*
* Frees up bootmem
* Calculates and displays memory available/used
*/
void __init mem_init(void)
{
int codesize, datasize, initsize, reserved_pages, free_pages;
int tmp;
high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
totalram_pages = free_all_bootmem();
/* count all reserved pages [kernel code/data/mem_map..] */
reserved_pages = 0;
for (tmp = 0; tmp < max_mapnr; tmp++)
if (PageReserved(mem_map + tmp))
reserved_pages++;
/* XXX: nr_free_pages() is equivalent */
free_pages = max_mapnr - reserved_pages;
/*
* For the purpose of display below, split the "reserve mem"
* kernel code/data is already shown explicitly,
* Show any other reservations (mem_map[ ] et al)
*/
reserved_pages -= (((unsigned int)_end - CONFIG_LINUX_LINK_BASE) >>
PAGE_SHIFT);
codesize = _etext - _text;
datasize = _end - _etext;
initsize = __init_end - __init_begin;
pr_info("Memory Available: %dM / %ldM (%dK code, %dK data, %dK init, %dK reserv)\n",
PAGES_TO_MB(free_pages),
TO_MB(arc_mem_sz),
TO_KB(codesize), TO_KB(datasize), TO_KB(initsize),
PAGES_TO_KB(reserved_pages));
}
static void __init free_init_pages(const char *what, unsigned long begin,
unsigned long end)
{
unsigned long addr;
pr_info("Freeing %s: %ldk [%lx] to [%lx]\n",
what, TO_KB(end - begin), begin, end);
/* need to check that the page we free is not a partial page */
for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
}
/*
* free_initmem: Free all the __init memory.
*/
void __init_refok free_initmem(void)
{
free_init_pages("unused kernel memory",
(unsigned long)__init_begin,
(unsigned long)__init_end);
}
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
free_init_pages("initrd memory", start, end);
}
#endif
/*
* ARC FPGA Platform support code
*
* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
*
* 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/types.h>
#include <linux/init.h>
#include <linux/platform_device.h>
/*
* Early Platform Initialization called from setup_arch()
*/
void __init arc_platform_early_init(void)
{
pr_info("[plat-arcfpga]: registering early dev resources\n");
}
int __init fpga_plat_init(void)
{
pr_info("[plat-arcfpga]: registering device resources\n");
return 0;
}
arch_initcall(fpga_plat_init);
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