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 <linux/cpu.h> 30 #include <asm/cacheflush.h> 31 #include <asm/entry.h> 32 #include <asm/cpuinfo.h> 33 34 #include <asm/system.h> 35 #include <asm/prom.h> 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 char cmd_line[COMMAND_LINE_SIZE]; 46 47 void __init setup_arch(char **cmdline_p) 48 { 49 *cmdline_p = cmd_line; 50 51 console_verbose(); 52 53 unflatten_device_tree(); 54 55 /* NOTE I think that this function is not necessary to call */ 56 /* irq_early_init(); */ 57 setup_cpuinfo(); 58 59 microblaze_cache_init(); 60 61 setup_memory(); 62 63 #ifdef CONFIG_EARLY_PRINTK 64 /* remap early console to virtual address */ 65 remap_early_printk(); 66 #endif 67 68 xilinx_pci_init(); 69 70 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER) 71 printk(KERN_NOTICE "Self modified code enable\n"); 72 #endif 73 74 #ifdef CONFIG_VT 75 #if defined(CONFIG_XILINX_CONSOLE) 76 conswitchp = &xil_con; 77 #elif defined(CONFIG_DUMMY_CONSOLE) 78 conswitchp = &dummy_con; 79 #endif 80 #endif 81 } 82 83 #ifdef CONFIG_MTD_UCLINUX 84 /* Handle both romfs and cramfs types, without generating unnecessary 85 code (ie no point checking for CRAMFS if it's not even enabled) */ 86 inline unsigned get_romfs_len(unsigned *addr) 87 { 88 #ifdef CONFIG_ROMFS_FS 89 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 90 return be32_to_cpu(addr[2]); 91 #endif 92 93 #ifdef CONFIG_CRAMFS 94 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 95 return le32_to_cpu(addr[1]); 96 #endif 97 return 0; 98 } 99 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 100 101 void __init machine_early_init(const char *cmdline, unsigned int ram, 102 unsigned int fdt, unsigned int msr) 103 { 104 unsigned long *src, *dst; 105 unsigned int offset = 0; 106 107 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 108 * end of kernel. There are two position which we want to check. 109 * The first is __init_end and the second __bss_start. 110 */ 111 #ifdef CONFIG_MTD_UCLINUX 112 int romfs_size; 113 unsigned int romfs_base; 114 char *old_klimit = klimit; 115 116 romfs_base = (ram ? ram : (unsigned int)&__init_end); 117 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 118 if (!romfs_size) { 119 romfs_base = (unsigned int)&__bss_start; 120 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 121 } 122 123 /* Move ROMFS out of BSS before clearing it */ 124 if (romfs_size > 0) { 125 memmove(&_ebss, (int *)romfs_base, romfs_size); 126 klimit += romfs_size; 127 } 128 #endif 129 130 /* clearing bss section */ 131 memset(__bss_start, 0, __bss_stop-__bss_start); 132 memset(_ssbss, 0, _esbss-_ssbss); 133 134 /* Copy command line passed from bootloader */ 135 #ifndef CONFIG_CMDLINE_BOOL 136 if (cmdline && cmdline[0] != '\0') 137 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE); 138 #endif 139 140 lockdep_init(); 141 142 /* initialize device tree for usage in early_printk */ 143 early_init_devtree((void *)_fdt_start); 144 145 #ifdef CONFIG_EARLY_PRINTK 146 setup_early_printk(NULL); 147 #endif 148 149 printk("Ramdisk addr 0x%08x, ", ram); 150 if (fdt) 151 printk("FDT at 0x%08x\n", fdt); 152 else 153 printk("Compiled-in FDT at 0x%08x\n", 154 (unsigned int)_fdt_start); 155 156 #ifdef CONFIG_MTD_UCLINUX 157 printk("Found romfs @ 0x%08x (0x%08x)\n", 158 romfs_base, romfs_size); 159 printk("#### klimit %p ####\n", old_klimit); 160 BUG_ON(romfs_size < 0); /* What else can we do? */ 161 162 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 163 romfs_size, romfs_base, (unsigned)&_ebss); 164 165 printk("New klimit: 0x%08x\n", (unsigned)klimit); 166 #endif 167 168 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 169 if (msr) 170 printk("!!!Your kernel has setup MSR instruction but " 171 "CPU don't have it %x\n", msr); 172 #else 173 if (!msr) 174 printk("!!!Your kernel not setup MSR instruction but " 175 "CPU have it %x\n", msr); 176 #endif 177 178 /* Do not copy reset vectors. offset = 0x2 means skip the first 179 * two instructions. dst is pointer to MB vectors which are placed 180 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 181 #if !CONFIG_MANUAL_RESET_VECTOR 182 offset = 0x2; 183 #endif 184 dst = (unsigned long *) (offset * sizeof(u32)); 185 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 186 *dst = *src; 187 188 /* Initialize global data */ 189 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 190 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 191 } 192 193 #ifdef CONFIG_DEBUG_FS 194 struct dentry *of_debugfs_root; 195 196 static int microblaze_debugfs_init(void) 197 { 198 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 199 200 return of_debugfs_root == NULL; 201 } 202 arch_initcall(microblaze_debugfs_init); 203 #endif 204 205 static int dflt_bus_notify(struct notifier_block *nb, 206 unsigned long action, void *data) 207 { 208 struct device *dev = data; 209 210 /* We are only intereted in device addition */ 211 if (action != BUS_NOTIFY_ADD_DEVICE) 212 return 0; 213 214 set_dma_ops(dev, &dma_direct_ops); 215 216 return NOTIFY_DONE; 217 } 218 219 static struct notifier_block dflt_plat_bus_notifier = { 220 .notifier_call = dflt_bus_notify, 221 .priority = INT_MAX, 222 }; 223 224 static int __init setup_bus_notifier(void) 225 { 226 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); 227 228 return 0; 229 } 230 arch_initcall(setup_bus_notifier); 231 232 static DEFINE_PER_CPU(struct cpu, cpu_devices); 233 234 static int __init topology_init(void) 235 { 236 int i, ret; 237 238 for_each_present_cpu(i) { 239 struct cpu *c = &per_cpu(cpu_devices, i); 240 241 ret = register_cpu(c, i); 242 if (ret) 243 printk(KERN_WARNING "topology_init: register_cpu %d " 244 "failed (%d)\n", i, ret); 245 } 246 247 return 0; 248 } 249 subsys_initcall(topology_init); 250