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_platform.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/prom.h> 37 #include <asm/pgtable.h> 38 39 DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ 40 DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ 41 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ 42 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ 43 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ 44 45 unsigned int boot_cpuid; 46 /* 47 * Placed cmd_line to .data section because can be initialized from 48 * ASM code. Default position is BSS section which is cleared 49 * in machine_early_init(). 50 */ 51 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); 52 53 void __init setup_arch(char **cmdline_p) 54 { 55 *cmdline_p = boot_command_line; 56 57 console_verbose(); 58 59 unflatten_device_tree(); 60 61 setup_cpuinfo(); 62 63 microblaze_cache_init(); 64 65 setup_memory(); 66 67 #ifdef CONFIG_EARLY_PRINTK 68 /* remap early console to virtual address */ 69 remap_early_printk(); 70 #endif 71 72 xilinx_pci_init(); 73 74 #if defined(CONFIG_DUMMY_CONSOLE) 75 conswitchp = &dummy_con; 76 #endif 77 } 78 79 #ifdef CONFIG_MTD_UCLINUX 80 /* Handle both romfs and cramfs types, without generating unnecessary 81 code (ie no point checking for CRAMFS if it's not even enabled) */ 82 inline unsigned get_romfs_len(unsigned *addr) 83 { 84 #ifdef CONFIG_ROMFS_FS 85 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 86 return be32_to_cpu(addr[2]); 87 #endif 88 89 #ifdef CONFIG_CRAMFS 90 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 91 return le32_to_cpu(addr[1]); 92 #endif 93 return 0; 94 } 95 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 96 97 unsigned long kernel_tlb; 98 99 void __init machine_early_init(const char *cmdline, unsigned int ram, 100 unsigned int fdt, unsigned int msr, unsigned int tlb0, 101 unsigned int tlb1) 102 { 103 unsigned long *src, *dst; 104 unsigned int offset = 0; 105 106 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 107 * end of kernel. There are two position which we want to check. 108 * The first is __init_end and the second __bss_start. 109 */ 110 #ifdef CONFIG_MTD_UCLINUX 111 int romfs_size; 112 unsigned int romfs_base; 113 char *old_klimit = klimit; 114 115 romfs_base = (ram ? ram : (unsigned int)&__init_end); 116 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 117 if (!romfs_size) { 118 romfs_base = (unsigned int)&__bss_start; 119 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 120 } 121 122 /* Move ROMFS out of BSS before clearing it */ 123 if (romfs_size > 0) { 124 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 125 klimit += romfs_size; 126 } 127 #endif 128 129 /* clearing bss section */ 130 memset(__bss_start, 0, __bss_stop-__bss_start); 131 memset(_ssbss, 0, _esbss-_ssbss); 132 133 /* initialize device tree for usage in early_printk */ 134 early_init_devtree(_fdt_start); 135 136 #ifdef CONFIG_EARLY_PRINTK 137 setup_early_printk(NULL); 138 #endif 139 140 /* setup kernel_tlb after BSS cleaning 141 * Maybe worth to move to asm code */ 142 kernel_tlb = tlb0 + tlb1; 143 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 144 tlb1, kernel_tlb); */ 145 146 pr_info("Ramdisk addr 0x%08x, ", ram); 147 if (fdt) 148 pr_info("FDT at 0x%08x\n", fdt); 149 else 150 pr_info("Compiled-in FDT at %p\n", _fdt_start); 151 152 #ifdef CONFIG_MTD_UCLINUX 153 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 154 romfs_base, romfs_size); 155 pr_info("#### klimit %p ####\n", old_klimit); 156 BUG_ON(romfs_size < 0); /* What else can we do? */ 157 158 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 159 romfs_size, romfs_base, (unsigned)&__bss_stop); 160 161 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 162 #endif 163 164 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 165 if (msr) { 166 pr_info("!!!Your kernel has setup MSR instruction but "); 167 pr_cont("CPU don't have it %x\n", msr); 168 } 169 #else 170 if (!msr) { 171 pr_info("!!!Your kernel not setup MSR instruction but "); 172 pr_cont("CPU have it %x\n", msr); 173 } 174 #endif 175 176 /* Do not copy reset vectors. offset = 0x2 means skip the first 177 * two instructions. dst is pointer to MB vectors which are placed 178 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 179 #if !CONFIG_MANUAL_RESET_VECTOR 180 offset = 0x2; 181 #endif 182 dst = (unsigned long *) (offset * sizeof(u32)); 183 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 184 *dst = *src; 185 186 /* Initialize global data */ 187 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 188 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 189 } 190 191 void __init time_init(void) 192 { 193 of_clk_init(NULL); 194 setup_cpuinfo_clk(); 195 clocksource_probe(); 196 } 197 198 #ifdef CONFIG_DEBUG_FS 199 struct dentry *of_debugfs_root; 200 201 static int microblaze_debugfs_init(void) 202 { 203 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 204 205 return of_debugfs_root == NULL; 206 } 207 arch_initcall(microblaze_debugfs_init); 208 209 # ifdef CONFIG_MMU 210 static int __init debugfs_tlb(void) 211 { 212 struct dentry *d; 213 214 if (!of_debugfs_root) 215 return -ENODEV; 216 217 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 218 if (!d) 219 return -ENOMEM; 220 221 return 0; 222 } 223 device_initcall(debugfs_tlb); 224 # endif 225 #endif 226