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/clk-provider.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 22 #include <asm/setup.h> 23 #include <asm/sections.h> 24 #include <asm/page.h> 25 #include <linux/io.h> 26 #include <linux/bug.h> 27 #include <linux/param.h> 28 #include <linux/pci.h> 29 #include <linux/cache.h> 30 #include <linux/of.h> 31 #include <linux/dma-mapping.h> 32 #include <asm/cacheflush.h> 33 #include <asm/entry.h> 34 #include <asm/cpuinfo.h> 35 36 #include <asm/pgtable.h> 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 unsigned int boot_cpuid; 45 /* 46 * Placed cmd_line to .data section because can be initialized from 47 * ASM code. Default position is BSS section which is cleared 48 * in machine_early_init(). 49 */ 50 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); 51 52 void __init setup_arch(char **cmdline_p) 53 { 54 *cmdline_p = boot_command_line; 55 56 setup_memory(); 57 parse_early_param(); 58 59 console_verbose(); 60 61 unflatten_device_tree(); 62 63 setup_cpuinfo(); 64 65 microblaze_cache_init(); 66 67 xilinx_pci_init(); 68 } 69 70 #ifdef CONFIG_MTD_UCLINUX 71 /* Handle both romfs and cramfs types, without generating unnecessary 72 code (ie no point checking for CRAMFS if it's not even enabled) */ 73 inline unsigned get_romfs_len(unsigned *addr) 74 { 75 #ifdef CONFIG_ROMFS_FS 76 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 77 return be32_to_cpu(addr[2]); 78 #endif 79 80 #ifdef CONFIG_CRAMFS 81 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 82 return le32_to_cpu(addr[1]); 83 #endif 84 return 0; 85 } 86 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 87 88 unsigned long kernel_tlb; 89 90 void __init machine_early_init(const char *cmdline, unsigned int ram, 91 unsigned int fdt, unsigned int msr, unsigned int tlb0, 92 unsigned int tlb1) 93 { 94 unsigned long *src, *dst; 95 unsigned int offset = 0; 96 97 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 98 * end of kernel. There are two position which we want to check. 99 * The first is __init_end and the second __bss_start. 100 */ 101 #ifdef CONFIG_MTD_UCLINUX 102 int romfs_size; 103 unsigned int romfs_base; 104 char *old_klimit = klimit; 105 106 romfs_base = (ram ? ram : (unsigned int)&__init_end); 107 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 108 if (!romfs_size) { 109 romfs_base = (unsigned int)&__bss_start; 110 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 111 } 112 113 /* Move ROMFS out of BSS before clearing it */ 114 if (romfs_size > 0) { 115 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 116 klimit += romfs_size; 117 } 118 #endif 119 120 /* clearing bss section */ 121 memset(__bss_start, 0, __bss_stop-__bss_start); 122 memset(_ssbss, 0, _esbss-_ssbss); 123 124 /* initialize device tree for usage in early_printk */ 125 early_init_devtree(_fdt_start); 126 127 /* setup kernel_tlb after BSS cleaning 128 * Maybe worth to move to asm code */ 129 kernel_tlb = tlb0 + tlb1; 130 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 131 tlb1, kernel_tlb); */ 132 133 pr_info("Ramdisk addr 0x%08x, ", ram); 134 if (fdt) 135 pr_info("FDT at 0x%08x\n", fdt); 136 else 137 pr_info("Compiled-in FDT at %p\n", _fdt_start); 138 139 #ifdef CONFIG_MTD_UCLINUX 140 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 141 romfs_base, romfs_size); 142 pr_info("#### klimit %p ####\n", old_klimit); 143 BUG_ON(romfs_size < 0); /* What else can we do? */ 144 145 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 146 romfs_size, romfs_base, (unsigned)&__bss_stop); 147 148 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 149 #endif 150 151 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 152 if (msr) { 153 pr_info("!!!Your kernel has setup MSR instruction but "); 154 pr_cont("CPU don't have it %x\n", msr); 155 } 156 #else 157 if (!msr) { 158 pr_info("!!!Your kernel not setup MSR instruction but "); 159 pr_cont("CPU have it %x\n", msr); 160 } 161 #endif 162 163 /* Do not copy reset vectors. offset = 0x2 means skip the first 164 * two instructions. dst is pointer to MB vectors which are placed 165 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 166 #if !CONFIG_MANUAL_RESET_VECTOR 167 offset = 0x2; 168 #endif 169 dst = (unsigned long *) (offset * sizeof(u32)); 170 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 171 *dst = *src; 172 173 /* Initialize global data */ 174 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 175 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 176 } 177 178 void __init time_init(void) 179 { 180 of_clk_init(NULL); 181 setup_cpuinfo_clk(); 182 timer_probe(); 183 } 184 185 #ifdef CONFIG_DEBUG_FS 186 struct dentry *of_debugfs_root; 187 188 static int microblaze_debugfs_init(void) 189 { 190 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 191 return 0; 192 } 193 arch_initcall(microblaze_debugfs_init); 194 195 # ifdef CONFIG_MMU 196 static int __init debugfs_tlb(void) 197 { 198 debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 199 return 0; 200 } 201 device_initcall(debugfs_tlb); 202 # endif 203 #endif 204