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/string.h> 13 #include <linux/seq_file.h> 14 #include <linux/cpu.h> 15 #include <linux/initrd.h> 16 #include <linux/console.h> 17 #include <linux/debugfs.h> 18 19 #include <asm/setup.h> 20 #include <asm/sections.h> 21 #include <asm/page.h> 22 #include <linux/io.h> 23 #include <linux/bug.h> 24 #include <linux/param.h> 25 #include <linux/pci.h> 26 #include <linux/cache.h> 27 #include <linux/of_platform.h> 28 #include <linux/dma-mapping.h> 29 #include <asm/cacheflush.h> 30 #include <asm/entry.h> 31 #include <asm/cpuinfo.h> 32 33 #include <asm/prom.h> 34 #include <asm/pgtable.h> 35 36 DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ 37 DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ 38 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ 39 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ 40 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ 41 42 unsigned int boot_cpuid; 43 char cmd_line[COMMAND_LINE_SIZE]; 44 45 void __init setup_arch(char **cmdline_p) 46 { 47 *cmdline_p = cmd_line; 48 49 console_verbose(); 50 51 unflatten_device_tree(); 52 53 setup_cpuinfo(); 54 55 microblaze_cache_init(); 56 57 setup_memory(); 58 59 #ifdef CONFIG_EARLY_PRINTK 60 /* remap early console to virtual address */ 61 remap_early_printk(); 62 #endif 63 64 xilinx_pci_init(); 65 66 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER) 67 printk(KERN_NOTICE "Self modified code enable\n"); 68 #endif 69 70 #ifdef CONFIG_VT 71 #if defined(CONFIG_XILINX_CONSOLE) 72 conswitchp = &xil_con; 73 #elif defined(CONFIG_DUMMY_CONSOLE) 74 conswitchp = &dummy_con; 75 #endif 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 void __init machine_early_init(const char *cmdline, unsigned int ram, 98 unsigned int fdt, unsigned int msr) 99 { 100 unsigned long *src, *dst; 101 unsigned int offset = 0; 102 103 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 104 * end of kernel. There are two position which we want to check. 105 * The first is __init_end and the second __bss_start. 106 */ 107 #ifdef CONFIG_MTD_UCLINUX 108 int romfs_size; 109 unsigned int romfs_base; 110 char *old_klimit = klimit; 111 112 romfs_base = (ram ? ram : (unsigned int)&__init_end); 113 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 114 if (!romfs_size) { 115 romfs_base = (unsigned int)&__bss_start; 116 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 117 } 118 119 /* Move ROMFS out of BSS before clearing it */ 120 if (romfs_size > 0) { 121 memmove(&_ebss, (int *)romfs_base, romfs_size); 122 klimit += romfs_size; 123 } 124 #endif 125 126 /* clearing bss section */ 127 memset(__bss_start, 0, __bss_stop-__bss_start); 128 memset(_ssbss, 0, _esbss-_ssbss); 129 130 /* Copy command line passed from bootloader */ 131 #ifndef CONFIG_CMDLINE_BOOL 132 if (cmdline && cmdline[0] != '\0') 133 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE); 134 #endif 135 136 lockdep_init(); 137 138 /* initialize device tree for usage in early_printk */ 139 early_init_devtree((void *)_fdt_start); 140 141 #ifdef CONFIG_EARLY_PRINTK 142 setup_early_printk(NULL); 143 #endif 144 145 printk("Ramdisk addr 0x%08x, ", ram); 146 if (fdt) 147 printk("FDT at 0x%08x\n", fdt); 148 else 149 printk("Compiled-in FDT at 0x%08x\n", 150 (unsigned int)_fdt_start); 151 152 #ifdef CONFIG_MTD_UCLINUX 153 printk("Found romfs @ 0x%08x (0x%08x)\n", 154 romfs_base, romfs_size); 155 printk("#### klimit %p ####\n", old_klimit); 156 BUG_ON(romfs_size < 0); /* What else can we do? */ 157 158 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 159 romfs_size, romfs_base, (unsigned)&_ebss); 160 161 printk("New klimit: 0x%08x\n", (unsigned)klimit); 162 #endif 163 164 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 165 if (msr) 166 printk("!!!Your kernel has setup MSR instruction but " 167 "CPU don't have it %x\n", msr); 168 #else 169 if (!msr) 170 printk("!!!Your kernel not setup MSR instruction but " 171 "CPU have it %x\n", msr); 172 #endif 173 174 /* Do not copy reset vectors. offset = 0x2 means skip the first 175 * two instructions. dst is pointer to MB vectors which are placed 176 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 177 #if !CONFIG_MANUAL_RESET_VECTOR 178 offset = 0x2; 179 #endif 180 dst = (unsigned long *) (offset * sizeof(u32)); 181 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 182 *dst = *src; 183 184 /* Initialize global data */ 185 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 186 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 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); 195 196 return of_debugfs_root == NULL; 197 } 198 arch_initcall(microblaze_debugfs_init); 199 #endif 200 201 static int dflt_bus_notify(struct notifier_block *nb, 202 unsigned long action, void *data) 203 { 204 struct device *dev = data; 205 206 /* We are only intereted in device addition */ 207 if (action != BUS_NOTIFY_ADD_DEVICE) 208 return 0; 209 210 set_dma_ops(dev, &dma_direct_ops); 211 212 return NOTIFY_DONE; 213 } 214 215 static struct notifier_block dflt_plat_bus_notifier = { 216 .notifier_call = dflt_bus_notify, 217 .priority = INT_MAX, 218 }; 219 220 static int __init setup_bus_notifier(void) 221 { 222 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); 223 224 return 0; 225 } 226 227 arch_initcall(setup_bus_notifier); 228