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/system.h> 34 #include <asm/prom.h> 35 #include <asm/pgtable.h> 36 37 DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ 38 DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ 39 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ 40 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ 41 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ 42 43 unsigned int boot_cpuid; 44 char cmd_line[COMMAND_LINE_SIZE]; 45 46 void __init setup_arch(char **cmdline_p) 47 { 48 *cmdline_p = cmd_line; 49 50 console_verbose(); 51 52 unflatten_device_tree(); 53 54 setup_cpuinfo(); 55 56 microblaze_cache_init(); 57 58 setup_memory(); 59 60 #ifdef CONFIG_EARLY_PRINTK 61 /* remap early console to virtual address */ 62 remap_early_printk(); 63 #endif 64 65 xilinx_pci_init(); 66 67 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER) 68 printk(KERN_NOTICE "Self modified code enable\n"); 69 #endif 70 71 #ifdef CONFIG_VT 72 #if defined(CONFIG_XILINX_CONSOLE) 73 conswitchp = &xil_con; 74 #elif defined(CONFIG_DUMMY_CONSOLE) 75 conswitchp = &dummy_con; 76 #endif 77 #endif 78 } 79 80 #ifdef CONFIG_MTD_UCLINUX 81 /* Handle both romfs and cramfs types, without generating unnecessary 82 code (ie no point checking for CRAMFS if it's not even enabled) */ 83 inline unsigned get_romfs_len(unsigned *addr) 84 { 85 #ifdef CONFIG_ROMFS_FS 86 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 87 return be32_to_cpu(addr[2]); 88 #endif 89 90 #ifdef CONFIG_CRAMFS 91 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 92 return le32_to_cpu(addr[1]); 93 #endif 94 return 0; 95 } 96 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 97 98 void __init machine_early_init(const char *cmdline, unsigned int ram, 99 unsigned int fdt, unsigned int msr) 100 { 101 unsigned long *src, *dst; 102 unsigned int offset = 0; 103 104 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 105 * end of kernel. There are two position which we want to check. 106 * The first is __init_end and the second __bss_start. 107 */ 108 #ifdef CONFIG_MTD_UCLINUX 109 int romfs_size; 110 unsigned int romfs_base; 111 char *old_klimit = klimit; 112 113 romfs_base = (ram ? ram : (unsigned int)&__init_end); 114 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 115 if (!romfs_size) { 116 romfs_base = (unsigned int)&__bss_start; 117 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 118 } 119 120 /* Move ROMFS out of BSS before clearing it */ 121 if (romfs_size > 0) { 122 memmove(&_ebss, (int *)romfs_base, romfs_size); 123 klimit += romfs_size; 124 } 125 #endif 126 127 /* clearing bss section */ 128 memset(__bss_start, 0, __bss_stop-__bss_start); 129 memset(_ssbss, 0, _esbss-_ssbss); 130 131 /* Copy command line passed from bootloader */ 132 #ifndef CONFIG_CMDLINE_BOOL 133 if (cmdline && cmdline[0] != '\0') 134 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE); 135 #endif 136 137 lockdep_init(); 138 139 /* initialize device tree for usage in early_printk */ 140 early_init_devtree((void *)_fdt_start); 141 142 #ifdef CONFIG_EARLY_PRINTK 143 setup_early_printk(NULL); 144 #endif 145 146 printk("Ramdisk addr 0x%08x, ", ram); 147 if (fdt) 148 printk("FDT at 0x%08x\n", fdt); 149 else 150 printk("Compiled-in FDT at 0x%08x\n", 151 (unsigned int)_fdt_start); 152 153 #ifdef CONFIG_MTD_UCLINUX 154 printk("Found romfs @ 0x%08x (0x%08x)\n", 155 romfs_base, romfs_size); 156 printk("#### klimit %p ####\n", old_klimit); 157 BUG_ON(romfs_size < 0); /* What else can we do? */ 158 159 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 160 romfs_size, romfs_base, (unsigned)&_ebss); 161 162 printk("New klimit: 0x%08x\n", (unsigned)klimit); 163 #endif 164 165 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 166 if (msr) 167 printk("!!!Your kernel has setup MSR instruction but " 168 "CPU don't have it %x\n", msr); 169 #else 170 if (!msr) 171 printk("!!!Your kernel not setup MSR instruction but " 172 "CPU have it %x\n", msr); 173 #endif 174 175 /* Do not copy reset vectors. offset = 0x2 means skip the first 176 * two instructions. dst is pointer to MB vectors which are placed 177 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 178 #if !CONFIG_MANUAL_RESET_VECTOR 179 offset = 0x2; 180 #endif 181 dst = (unsigned long *) (offset * sizeof(u32)); 182 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 183 *dst = *src; 184 185 /* Initialize global data */ 186 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 187 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 188 } 189 190 #ifdef CONFIG_DEBUG_FS 191 struct dentry *of_debugfs_root; 192 193 static int microblaze_debugfs_init(void) 194 { 195 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 196 197 return of_debugfs_root == NULL; 198 } 199 arch_initcall(microblaze_debugfs_init); 200 #endif 201 202 static int dflt_bus_notify(struct notifier_block *nb, 203 unsigned long action, void *data) 204 { 205 struct device *dev = data; 206 207 /* We are only intereted in device addition */ 208 if (action != BUS_NOTIFY_ADD_DEVICE) 209 return 0; 210 211 set_dma_ops(dev, &dma_direct_ops); 212 213 return NOTIFY_DONE; 214 } 215 216 static struct notifier_block dflt_plat_bus_notifier = { 217 .notifier_call = dflt_bus_notify, 218 .priority = INT_MAX, 219 }; 220 221 static int __init setup_bus_notifier(void) 222 { 223 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); 224 225 return 0; 226 } 227 228 arch_initcall(setup_bus_notifier); 229