| /* |
| * 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.h> |
| #include <linux/dma-mapping.h> |
| #include <asm/cacheflush.h> |
| #include <asm/entry.h> |
| #include <asm/cpuinfo.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; |
| |
| setup_memory(); |
| parse_early_param(); |
| |
| console_verbose(); |
| |
| unflatten_device_tree(); |
| |
| setup_cpuinfo(); |
| |
| microblaze_cache_init(); |
| |
| xilinx_pci_init(); |
| } |
| |
| #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); |
| |
| /* initialize device tree for usage in early_printk */ |
| early_init_devtree(_fdt_start); |
| |
| /* 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(); |
| timer_probe(); |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| struct dentry *of_debugfs_root; |
| |
| static int microblaze_debugfs_init(void) |
| { |
| of_debugfs_root = debugfs_create_dir("microblaze", NULL); |
| return 0; |
| } |
| arch_initcall(microblaze_debugfs_init); |
| |
| # ifdef CONFIG_MMU |
| static int __init debugfs_tlb(void) |
| { |
| debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); |
| return 0; |
| } |
| device_initcall(debugfs_tlb); |
| # endif |
| #endif |