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 #if defined(CONFIG_DUMMY_CONSOLE) 70 conswitchp = &dummy_con; 71 #endif 72 } 73 74 #ifdef CONFIG_MTD_UCLINUX 75 /* Handle both romfs and cramfs types, without generating unnecessary 76 code (ie no point checking for CRAMFS if it's not even enabled) */ 77 inline unsigned get_romfs_len(unsigned *addr) 78 { 79 #ifdef CONFIG_ROMFS_FS 80 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 81 return be32_to_cpu(addr[2]); 82 #endif 83 84 #ifdef CONFIG_CRAMFS 85 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 86 return le32_to_cpu(addr[1]); 87 #endif 88 return 0; 89 } 90 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 91 92 unsigned long kernel_tlb; 93 94 void __init machine_early_init(const char *cmdline, unsigned int ram, 95 unsigned int fdt, unsigned int msr, unsigned int tlb0, 96 unsigned int tlb1) 97 { 98 unsigned long *src, *dst; 99 unsigned int offset = 0; 100 101 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 102 * end of kernel. There are two position which we want to check. 103 * The first is __init_end and the second __bss_start. 104 */ 105 #ifdef CONFIG_MTD_UCLINUX 106 int romfs_size; 107 unsigned int romfs_base; 108 char *old_klimit = klimit; 109 110 romfs_base = (ram ? ram : (unsigned int)&__init_end); 111 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 112 if (!romfs_size) { 113 romfs_base = (unsigned int)&__bss_start; 114 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 115 } 116 117 /* Move ROMFS out of BSS before clearing it */ 118 if (romfs_size > 0) { 119 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 120 klimit += romfs_size; 121 } 122 #endif 123 124 /* clearing bss section */ 125 memset(__bss_start, 0, __bss_stop-__bss_start); 126 memset(_ssbss, 0, _esbss-_ssbss); 127 128 /* initialize device tree for usage in early_printk */ 129 early_init_devtree(_fdt_start); 130 131 /* setup kernel_tlb after BSS cleaning 132 * Maybe worth to move to asm code */ 133 kernel_tlb = tlb0 + tlb1; 134 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 135 tlb1, kernel_tlb); */ 136 137 pr_info("Ramdisk addr 0x%08x, ", ram); 138 if (fdt) 139 pr_info("FDT at 0x%08x\n", fdt); 140 else 141 pr_info("Compiled-in FDT at %p\n", _fdt_start); 142 143 #ifdef CONFIG_MTD_UCLINUX 144 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 145 romfs_base, romfs_size); 146 pr_info("#### klimit %p ####\n", old_klimit); 147 BUG_ON(romfs_size < 0); /* What else can we do? */ 148 149 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 150 romfs_size, romfs_base, (unsigned)&__bss_stop); 151 152 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 153 #endif 154 155 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 156 if (msr) { 157 pr_info("!!!Your kernel has setup MSR instruction but "); 158 pr_cont("CPU don't have it %x\n", msr); 159 } 160 #else 161 if (!msr) { 162 pr_info("!!!Your kernel not setup MSR instruction but "); 163 pr_cont("CPU have it %x\n", msr); 164 } 165 #endif 166 167 /* Do not copy reset vectors. offset = 0x2 means skip the first 168 * two instructions. dst is pointer to MB vectors which are placed 169 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 170 #if !CONFIG_MANUAL_RESET_VECTOR 171 offset = 0x2; 172 #endif 173 dst = (unsigned long *) (offset * sizeof(u32)); 174 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 175 *dst = *src; 176 177 /* Initialize global data */ 178 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 179 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 180 } 181 182 void __init time_init(void) 183 { 184 of_clk_init(NULL); 185 setup_cpuinfo_clk(); 186 timer_probe(); 187 } 188 189 #ifdef CONFIG_DEBUG_FS 190 struct dentry *of_debugfs_root; 191 192 static int microblaze_debugfs_init(void) 193 { 194 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 195 return 0; 196 } 197 arch_initcall(microblaze_debugfs_init); 198 199 # ifdef CONFIG_MMU 200 static int __init debugfs_tlb(void) 201 { 202 debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 203 return 0; 204 } 205 device_initcall(debugfs_tlb); 206 # endif 207 #endif 208