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Diffstat (limited to 'arch/microblaze/kernel/setup.c')
| -rw-r--r-- | arch/microblaze/kernel/setup.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/setup.c b/arch/microblaze/kernel/setup.c new file mode 100644 index 000000000..ab5b488e1 --- /dev/null +++ b/arch/microblaze/kernel/setup.c @@ -0,0 +1,227 @@ +/* + * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> + * Copyright (C) 2007-2009 PetaLogix + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/init.h> +#include <linux/clk-provider.h> +#include <linux/clocksource.h> +#include <linux/string.h> +#include <linux/seq_file.h> +#include <linux/cpu.h> +#include <linux/initrd.h> +#include <linux/console.h> +#include <linux/debugfs.h> +#include <linux/of_fdt.h> + +#include <asm/setup.h> +#include <asm/sections.h> +#include <asm/page.h> +#include <linux/io.h> +#include <linux/bug.h> +#include <linux/param.h> +#include <linux/pci.h> +#include <linux/cache.h> +#include <linux/of_platform.h> +#include <linux/dma-mapping.h> +#include <asm/cacheflush.h> +#include <asm/entry.h> +#include <asm/cpuinfo.h> + +#include <asm/prom.h> +#include <asm/pgtable.h> + +DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ +DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ +DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ +DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ +DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ + +unsigned int boot_cpuid; +/* + * Placed cmd_line to .data section because can be initialized from + * ASM code. Default position is BSS section which is cleared + * in machine_early_init(). + */ +char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); + +void __init setup_arch(char **cmdline_p) +{ + *cmdline_p = boot_command_line; + + console_verbose(); + + unflatten_device_tree(); + + setup_cpuinfo(); + + microblaze_cache_init(); + + setup_memory(); + +#ifdef CONFIG_EARLY_PRINTK + /* remap early console to virtual address */ + remap_early_printk(); +#endif + + xilinx_pci_init(); + +#if defined(CONFIG_DUMMY_CONSOLE) + conswitchp = &dummy_con; +#endif +} + +#ifdef CONFIG_MTD_UCLINUX +/* Handle both romfs and cramfs types, without generating unnecessary + code (ie no point checking for CRAMFS if it's not even enabled) */ +inline unsigned get_romfs_len(unsigned *addr) +{ +#ifdef CONFIG_ROMFS_FS + if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ + return be32_to_cpu(addr[2]); +#endif + +#ifdef CONFIG_CRAMFS + if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ + return le32_to_cpu(addr[1]); +#endif + return 0; +} +#endif /* CONFIG_MTD_UCLINUX_EBSS */ + +unsigned long kernel_tlb; + +void __init machine_early_init(const char *cmdline, unsigned int ram, + unsigned int fdt, unsigned int msr, unsigned int tlb0, + unsigned int tlb1) +{ + unsigned long *src, *dst; + unsigned int offset = 0; + + /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the + * end of kernel. There are two position which we want to check. + * The first is __init_end and the second __bss_start. + */ +#ifdef CONFIG_MTD_UCLINUX + int romfs_size; + unsigned int romfs_base; + char *old_klimit = klimit; + + romfs_base = (ram ? ram : (unsigned int)&__init_end); + romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); + if (!romfs_size) { + romfs_base = (unsigned int)&__bss_start; + romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); + } + + /* Move ROMFS out of BSS before clearing it */ + if (romfs_size > 0) { + memmove(&__bss_stop, (int *)romfs_base, romfs_size); + klimit += romfs_size; + } +#endif + +/* clearing bss section */ + memset(__bss_start, 0, __bss_stop-__bss_start); + memset(_ssbss, 0, _esbss-_ssbss); + + lockdep_init(); + +/* initialize device tree for usage in early_printk */ + early_init_devtree(_fdt_start); + +#ifdef CONFIG_EARLY_PRINTK + setup_early_printk(NULL); +#endif + + /* setup kernel_tlb after BSS cleaning + * Maybe worth to move to asm code */ + kernel_tlb = tlb0 + tlb1; + /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, + tlb1, kernel_tlb); */ + + pr_info("Ramdisk addr 0x%08x, ", ram); + if (fdt) + pr_info("FDT at 0x%08x\n", fdt); + else + pr_info("Compiled-in FDT at %p\n", _fdt_start); + +#ifdef CONFIG_MTD_UCLINUX + pr_info("Found romfs @ 0x%08x (0x%08x)\n", + romfs_base, romfs_size); + pr_info("#### klimit %p ####\n", old_klimit); + BUG_ON(romfs_size < 0); /* What else can we do? */ + + pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", + romfs_size, romfs_base, (unsigned)&__bss_stop); + + pr_info("New klimit: 0x%08x\n", (unsigned)klimit); +#endif + +#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR + if (msr) { + pr_info("!!!Your kernel has setup MSR instruction but "); + pr_cont("CPU don't have it %x\n", msr); + } +#else + if (!msr) { + pr_info("!!!Your kernel not setup MSR instruction but "); + pr_cont("CPU have it %x\n", msr); + } +#endif + + /* Do not copy reset vectors. offset = 0x2 means skip the first + * two instructions. dst is pointer to MB vectors which are placed + * in block ram. If you want to copy reset vector setup offset to 0x0 */ +#if !CONFIG_MANUAL_RESET_VECTOR + offset = 0x2; +#endif + dst = (unsigned long *) (offset * sizeof(u32)); + for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) + *dst = *src; + + /* Initialize global data */ + per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ + per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; +} + +void __init time_init(void) +{ + of_clk_init(NULL); + setup_cpuinfo_clk(); + clocksource_of_init(); +} + +#ifdef CONFIG_DEBUG_FS +struct dentry *of_debugfs_root; + +static int microblaze_debugfs_init(void) +{ + of_debugfs_root = debugfs_create_dir("microblaze", NULL); + + return of_debugfs_root == NULL; +} +arch_initcall(microblaze_debugfs_init); + +# ifdef CONFIG_MMU +static int __init debugfs_tlb(void) +{ + struct dentry *d; + + if (!of_debugfs_root) + return -ENODEV; + + d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); + if (!d) + return -ENOMEM; + + return 0; +} +device_initcall(debugfs_tlb); +# endif +#endif |