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 unsigned long kernel_tlb; 99 100 void __init machine_early_init(const char *cmdline, unsigned int ram, 101 unsigned int fdt, unsigned int msr, unsigned int tlb0, 102 unsigned int tlb1) 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 /* setup kernel_tlb after BSS cleaning 150 * Maybe worth to move to asm code */ 151 kernel_tlb = tlb0 + tlb1; 152 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 153 tlb1, kernel_tlb); */ 154 155 printk("Ramdisk addr 0x%08x, ", ram); 156 if (fdt) 157 printk("FDT at 0x%08x\n", fdt); 158 else 159 printk("Compiled-in FDT at 0x%08x\n", 160 (unsigned int)_fdt_start); 161 162 #ifdef CONFIG_MTD_UCLINUX 163 printk("Found romfs @ 0x%08x (0x%08x)\n", 164 romfs_base, romfs_size); 165 printk("#### klimit %p ####\n", old_klimit); 166 BUG_ON(romfs_size < 0); /* What else can we do? */ 167 168 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 169 romfs_size, romfs_base, (unsigned)&_ebss); 170 171 printk("New klimit: 0x%08x\n", (unsigned)klimit); 172 #endif 173 174 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 175 if (msr) 176 printk("!!!Your kernel has setup MSR instruction but " 177 "CPU don't have it %x\n", msr); 178 #else 179 if (!msr) 180 printk("!!!Your kernel not setup MSR instruction but " 181 "CPU have it %x\n", msr); 182 #endif 183 184 /* Do not copy reset vectors. offset = 0x2 means skip the first 185 * two instructions. dst is pointer to MB vectors which are placed 186 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 187 #if !CONFIG_MANUAL_RESET_VECTOR 188 offset = 0x2; 189 #endif 190 dst = (unsigned long *) (offset * sizeof(u32)); 191 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 192 *dst = *src; 193 194 /* Initialize global data */ 195 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 196 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 197 } 198 199 #ifdef CONFIG_DEBUG_FS 200 struct dentry *of_debugfs_root; 201 202 static int microblaze_debugfs_init(void) 203 { 204 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 205 206 return of_debugfs_root == NULL; 207 } 208 arch_initcall(microblaze_debugfs_init); 209 210 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 device_initcall(debugfs_tlb); 222 #endif 223 224 static int dflt_bus_notify(struct notifier_block *nb, 225 unsigned long action, void *data) 226 { 227 struct device *dev = data; 228 229 /* We are only intereted in device addition */ 230 if (action != BUS_NOTIFY_ADD_DEVICE) 231 return 0; 232 233 set_dma_ops(dev, &dma_direct_ops); 234 235 return NOTIFY_DONE; 236 } 237 238 static struct notifier_block dflt_plat_bus_notifier = { 239 .notifier_call = dflt_bus_notify, 240 .priority = INT_MAX, 241 }; 242 243 static int __init setup_bus_notifier(void) 244 { 245 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); 246 247 return 0; 248 } 249 250 arch_initcall(setup_bus_notifier); 251