diff options
author | Vineet Gupta <vgupta@synopsys.com> | 2013-01-18 13:42:20 +0400 |
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committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-15 21:45:54 +0400 |
commit | c121c5063c0674fad6811f0b0d86ec3bc6eecbbd (patch) | |
tree | 956c6f18fcf72d3e20a86168669237ecdabd8a13 /arch/arc/kernel | |
parent | 1162b0701b14ba112d4e3fe5c27c694caf983539 (diff) | |
download | linux-c121c5063c0674fad6811f0b0d86ec3bc6eecbbd.tar.xz |
ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem init
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arc/kernel')
-rw-r--r-- | arch/arc/kernel/head.S | 78 | ||||
-rw-r--r-- | arch/arc/kernel/reset.c | 33 | ||||
-rw-r--r-- | arch/arc/kernel/setup.c | 166 |
3 files changed, 277 insertions, 0 deletions
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S new file mode 100644 index 000000000000..e63f6a43abb1 --- /dev/null +++ b/arch/arc/kernel/head.S @@ -0,0 +1,78 @@ +/* + * 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 diff --git a/arch/arc/kernel/reset.c b/arch/arc/kernel/reset.c new file mode 100644 index 000000000000..e227a2b1c943 --- /dev/null +++ b/arch/arc/kernel/reset.c @@ -0,0 +1,33 @@ +/* + * 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; diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c new file mode 100644 index 000000000000..82ac20603398 --- /dev/null +++ b/arch/arc/kernel/setup.c @@ -0,0 +1,166 @@ +/* + * 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); |