1 /* 2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> 3 * Copyright (C) 2007-2009 PetaLogix 4 * Copyright (C) 2006 Atmark Techno, Inc. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/of_clk.h> 13 #include <linux/clocksource.h> 14 #include <linux/string.h> 15 #include <linux/seq_file.h> 16 #include <linux/cpu.h> 17 #include <linux/initrd.h> 18 #include <linux/console.h> 19 #include <linux/debugfs.h> 20 #include <linux/of_fdt.h> 21 #include <linux/pgtable.h> 22 23 #include <asm/setup.h> 24 #include <asm/sections.h> 25 #include <asm/page.h> 26 #include <linux/io.h> 27 #include <linux/bug.h> 28 #include <linux/param.h> 29 #include <linux/pci.h> 30 #include <linux/cache.h> 31 #include <linux/of.h> 32 #include <linux/dma-mapping.h> 33 #include <asm/cacheflush.h> 34 #include <asm/entry.h> 35 #include <asm/cpuinfo.h> 36 37 38 DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ 39 DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ 40 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ 41 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ 42 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ 43 44 /* 45 * Placed cmd_line to .data section because can be initialized from 46 * ASM code. Default position is BSS section which is cleared 47 * in machine_early_init(). 48 */ 49 char cmd_line[COMMAND_LINE_SIZE] __section(".data"); 50 51 void __init setup_arch(char **cmdline_p) 52 { 53 *cmdline_p = boot_command_line; 54 55 setup_memory(); 56 57 console_verbose(); 58 59 unflatten_device_tree(); 60 61 setup_cpuinfo(); 62 63 microblaze_cache_init(); 64 65 xilinx_pci_init(); 66 } 67 68 #ifdef CONFIG_MTD_UCLINUX 69 /* Handle both romfs and cramfs types, without generating unnecessary 70 code (ie no point checking for CRAMFS if it's not even enabled) */ 71 inline unsigned get_romfs_len(unsigned *addr) 72 { 73 #ifdef CONFIG_ROMFS_FS 74 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 75 return be32_to_cpu(addr[2]); 76 #endif 77 78 #ifdef CONFIG_CRAMFS 79 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 80 return le32_to_cpu(addr[1]); 81 #endif 82 return 0; 83 } 84 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 85 86 unsigned long kernel_tlb; 87 88 void __init machine_early_init(const char *cmdline, unsigned int ram, 89 unsigned int fdt, unsigned int msr, unsigned int tlb0, 90 unsigned int tlb1) 91 { 92 unsigned long *src, *dst; 93 unsigned int offset = 0; 94 95 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 96 * end of kernel. There are two position which we want to check. 97 * The first is __init_end and the second __bss_start. 98 */ 99 #ifdef CONFIG_MTD_UCLINUX 100 int romfs_size; 101 unsigned int romfs_base; 102 char *old_klimit = klimit; 103 104 romfs_base = (ram ? ram : (unsigned int)&__init_end); 105 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 106 if (!romfs_size) { 107 romfs_base = (unsigned int)&__bss_start; 108 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 109 } 110 111 /* Move ROMFS out of BSS before clearing it */ 112 if (romfs_size > 0) { 113 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 114 klimit += romfs_size; 115 } 116 #endif 117 118 /* clearing bss section */ 119 memset(__bss_start, 0, __bss_stop-__bss_start); 120 memset(_ssbss, 0, _esbss-_ssbss); 121 122 /* initialize device tree for usage in early_printk */ 123 early_init_devtree(_fdt_start); 124 125 /* setup kernel_tlb after BSS cleaning 126 * Maybe worth to move to asm code */ 127 kernel_tlb = tlb0 + tlb1; 128 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 129 tlb1, kernel_tlb); */ 130 131 pr_info("Ramdisk addr 0x%08x, ", ram); 132 if (fdt) 133 pr_info("FDT at 0x%08x\n", fdt); 134 else 135 pr_info("Compiled-in FDT at %p\n", _fdt_start); 136 137 #ifdef CONFIG_MTD_UCLINUX 138 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 139 romfs_base, romfs_size); 140 pr_info("#### klimit %p ####\n", old_klimit); 141 BUG_ON(romfs_size < 0); /* What else can we do? */ 142 143 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 144 romfs_size, romfs_base, (unsigned)&__bss_stop); 145 146 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 147 #endif 148 149 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 150 if (msr) { 151 pr_info("!!!Your kernel has setup MSR instruction but "); 152 pr_cont("CPU don't have it %x\n", msr); 153 } 154 #else 155 if (!msr) { 156 pr_info("!!!Your kernel not setup MSR instruction but "); 157 pr_cont("CPU have it %x\n", msr); 158 } 159 #endif 160 161 /* Do not copy reset vectors. offset = 0x2 means skip the first 162 * two instructions. dst is pointer to MB vectors which are placed 163 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 164 #if !CONFIG_MANUAL_RESET_VECTOR 165 offset = 0x2; 166 #endif 167 dst = (unsigned long *) (offset * sizeof(u32)); 168 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 169 *dst = *src; 170 171 /* Initialize global data */ 172 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 173 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 174 } 175 176 void __init time_init(void) 177 { 178 of_clk_init(NULL); 179 setup_cpuinfo_clk(); 180 timer_probe(); 181 } 182 183 #ifdef CONFIG_DEBUG_FS 184 struct dentry *of_debugfs_root; 185 186 static int microblaze_debugfs_init(void) 187 { 188 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 189 return 0; 190 } 191 arch_initcall(microblaze_debugfs_init); 192 193 static int __init debugfs_tlb(void) 194 { 195 debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 196 return 0; 197 } 198 device_initcall(debugfs_tlb); 199 #endif 200