1 /* 2 * Copyright (C) 2007-2009 Michal Simek <[email protected]> 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 58 console_verbose(); 59 60 unflatten_device_tree(); 61 62 setup_cpuinfo(); 63 64 microblaze_cache_init(); 65 66 xilinx_pci_init(); 67 } 68 69 #ifdef CONFIG_MTD_UCLINUX 70 /* Handle both romfs and cramfs types, without generating unnecessary 71 code (ie no point checking for CRAMFS if it's not even enabled) */ 72 inline unsigned get_romfs_len(unsigned *addr) 73 { 74 #ifdef CONFIG_ROMFS_FS 75 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 76 return be32_to_cpu(addr[2]); 77 #endif 78 79 #ifdef CONFIG_CRAMFS 80 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 81 return le32_to_cpu(addr[1]); 82 #endif 83 return 0; 84 } 85 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 86 87 unsigned long kernel_tlb; 88 89 void __init machine_early_init(const char *cmdline, unsigned int ram, 90 unsigned int fdt, unsigned int msr, unsigned int tlb0, 91 unsigned int tlb1) 92 { 93 unsigned long *src, *dst; 94 unsigned int offset = 0; 95 96 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 97 * end of kernel. There are two position which we want to check. 98 * The first is __init_end and the second __bss_start. 99 */ 100 #ifdef CONFIG_MTD_UCLINUX 101 int romfs_size; 102 unsigned int romfs_base; 103 char *old_klimit = klimit; 104 105 romfs_base = (ram ? ram : (unsigned int)&__init_end); 106 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 107 if (!romfs_size) { 108 romfs_base = (unsigned int)&__bss_start; 109 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 110 } 111 112 /* Move ROMFS out of BSS before clearing it */ 113 if (romfs_size > 0) { 114 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 115 klimit += romfs_size; 116 } 117 #endif 118 119 /* clearing bss section */ 120 memset(__bss_start, 0, __bss_stop-__bss_start); 121 memset(_ssbss, 0, _esbss-_ssbss); 122 123 /* initialize device tree for usage in early_printk */ 124 early_init_devtree(_fdt_start); 125 126 /* setup kernel_tlb after BSS cleaning 127 * Maybe worth to move to asm code */ 128 kernel_tlb = tlb0 + tlb1; 129 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 130 tlb1, kernel_tlb); */ 131 132 pr_info("Ramdisk addr 0x%08x, ", ram); 133 if (fdt) 134 pr_info("FDT at 0x%08x\n", fdt); 135 else 136 pr_info("Compiled-in FDT at %p\n", _fdt_start); 137 138 #ifdef CONFIG_MTD_UCLINUX 139 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 140 romfs_base, romfs_size); 141 pr_info("#### klimit %p ####\n", old_klimit); 142 BUG_ON(romfs_size < 0); /* What else can we do? */ 143 144 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 145 romfs_size, romfs_base, (unsigned)&__bss_stop); 146 147 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 148 #endif 149 150 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 151 if (msr) { 152 pr_info("!!!Your kernel has setup MSR instruction but "); 153 pr_cont("CPU don't have it %x\n", msr); 154 } 155 #else 156 if (!msr) { 157 pr_info("!!!Your kernel not setup MSR instruction but "); 158 pr_cont("CPU have it %x\n", msr); 159 } 160 #endif 161 162 /* Do not copy reset vectors. offset = 0x2 means skip the first 163 * two instructions. dst is pointer to MB vectors which are placed 164 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 165 #if !CONFIG_MANUAL_RESET_VECTOR 166 offset = 0x2; 167 #endif 168 dst = (unsigned long *) (offset * sizeof(u32)); 169 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 170 *dst = *src; 171 172 /* Initialize global data */ 173 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 174 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 175 } 176 177 void __init time_init(void) 178 { 179 of_clk_init(NULL); 180 setup_cpuinfo_clk(); 181 timer_probe(); 182 } 183 184 #ifdef CONFIG_DEBUG_FS 185 struct dentry *of_debugfs_root; 186 187 static int microblaze_debugfs_init(void) 188 { 189 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 190 return 0; 191 } 192 arch_initcall(microblaze_debugfs_init); 193 194 # ifdef CONFIG_MMU 195 static int __init debugfs_tlb(void) 196 { 197 debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 198 return 0; 199 } 200 device_initcall(debugfs_tlb); 201 # endif 202 #endif 203