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/clocksource.h> 13 #include <linux/string.h> 14 #include <linux/seq_file.h> 15 #include <linux/cpu.h> 16 #include <linux/initrd.h> 17 #include <linux/console.h> 18 #include <linux/debugfs.h> 19 20 #include <asm/setup.h> 21 #include <asm/sections.h> 22 #include <asm/page.h> 23 #include <linux/io.h> 24 #include <linux/bug.h> 25 #include <linux/param.h> 26 #include <linux/pci.h> 27 #include <linux/cache.h> 28 #include <linux/of_platform.h> 29 #include <linux/dma-mapping.h> 30 #include <asm/cacheflush.h> 31 #include <asm/entry.h> 32 #include <asm/cpuinfo.h> 33 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 /* 45 * Placed cmd_line to .data section because can be initialized from 46 * ASM code. Default position is BSS section which is cleared 47 * in machine_early_init(). 48 */ 49 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); 50 51 void __init setup_arch(char **cmdline_p) 52 { 53 *cmdline_p = cmd_line; 54 55 console_verbose(); 56 57 unflatten_device_tree(); 58 59 setup_cpuinfo(); 60 61 microblaze_cache_init(); 62 63 setup_memory(); 64 65 #ifdef CONFIG_EARLY_PRINTK 66 /* remap early console to virtual address */ 67 remap_early_printk(); 68 #endif 69 70 xilinx_pci_init(); 71 72 #ifdef CONFIG_VT 73 #if defined(CONFIG_XILINX_CONSOLE) 74 conswitchp = &xil_con; 75 #elif defined(CONFIG_DUMMY_CONSOLE) 76 conswitchp = &dummy_con; 77 #endif 78 #endif 79 } 80 81 #ifdef CONFIG_MTD_UCLINUX 82 /* Handle both romfs and cramfs types, without generating unnecessary 83 code (ie no point checking for CRAMFS if it's not even enabled) */ 84 inline unsigned get_romfs_len(unsigned *addr) 85 { 86 #ifdef CONFIG_ROMFS_FS 87 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 88 return be32_to_cpu(addr[2]); 89 #endif 90 91 #ifdef CONFIG_CRAMFS 92 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 93 return le32_to_cpu(addr[1]); 94 #endif 95 return 0; 96 } 97 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 98 99 unsigned long kernel_tlb; 100 101 void __init machine_early_init(const char *cmdline, unsigned int ram, 102 unsigned int fdt, unsigned int msr, unsigned int tlb0, 103 unsigned int tlb1) 104 { 105 unsigned long *src, *dst; 106 unsigned int offset = 0; 107 108 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 109 * end of kernel. There are two position which we want to check. 110 * The first is __init_end and the second __bss_start. 111 */ 112 #ifdef CONFIG_MTD_UCLINUX 113 int romfs_size; 114 unsigned int romfs_base; 115 char *old_klimit = klimit; 116 117 romfs_base = (ram ? ram : (unsigned int)&__init_end); 118 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 119 if (!romfs_size) { 120 romfs_base = (unsigned int)&__bss_start; 121 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 122 } 123 124 /* Move ROMFS out of BSS before clearing it */ 125 if (romfs_size > 0) { 126 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 127 klimit += romfs_size; 128 } 129 #endif 130 131 /* clearing bss section */ 132 memset(__bss_start, 0, __bss_stop-__bss_start); 133 memset(_ssbss, 0, _esbss-_ssbss); 134 135 lockdep_init(); 136 137 /* initialize device tree for usage in early_printk */ 138 early_init_devtree((void *)_fdt_start); 139 140 #ifdef CONFIG_EARLY_PRINTK 141 setup_early_printk(NULL); 142 #endif 143 144 /* setup kernel_tlb after BSS cleaning 145 * Maybe worth to move to asm code */ 146 kernel_tlb = tlb0 + tlb1; 147 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 148 tlb1, kernel_tlb); */ 149 150 pr_info("Ramdisk addr 0x%08x, ", ram); 151 if (fdt) 152 pr_info("FDT at 0x%08x\n", fdt); 153 else 154 pr_info("Compiled-in FDT at 0x%08x\n", 155 (unsigned int)_fdt_start); 156 157 #ifdef CONFIG_MTD_UCLINUX 158 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 159 romfs_base, romfs_size); 160 pr_info("#### klimit %p ####\n", old_klimit); 161 BUG_ON(romfs_size < 0); /* What else can we do? */ 162 163 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 164 romfs_size, romfs_base, (unsigned)&__bss_stop); 165 166 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 167 #endif 168 169 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 170 if (msr) { 171 pr_info("!!!Your kernel has setup MSR instruction but "); 172 pr_cont("CPU don't have it %x\n", msr); 173 } 174 #else 175 if (!msr) { 176 pr_info("!!!Your kernel not setup MSR instruction but "); 177 pr_cont"CPU have it %x\n", msr); 178 } 179 #endif 180 181 /* Do not copy reset vectors. offset = 0x2 means skip the first 182 * two instructions. dst is pointer to MB vectors which are placed 183 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 184 #if !CONFIG_MANUAL_RESET_VECTOR 185 offset = 0x2; 186 #endif 187 dst = (unsigned long *) (offset * sizeof(u32)); 188 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 189 *dst = *src; 190 191 /* Initialize global data */ 192 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 193 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 194 } 195 196 void __init time_init(void) 197 { 198 clocksource_of_init(); 199 } 200 201 #ifdef CONFIG_DEBUG_FS 202 struct dentry *of_debugfs_root; 203 204 static int microblaze_debugfs_init(void) 205 { 206 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 207 208 return of_debugfs_root == NULL; 209 } 210 arch_initcall(microblaze_debugfs_init); 211 212 # ifdef CONFIG_MMU 213 static int __init debugfs_tlb(void) 214 { 215 struct dentry *d; 216 217 if (!of_debugfs_root) 218 return -ENODEV; 219 220 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 221 if (!d) 222 return -ENOMEM; 223 224 return 0; 225 } 226 device_initcall(debugfs_tlb); 227 # endif 228 #endif 229 230 static int dflt_bus_notify(struct notifier_block *nb, 231 unsigned long action, void *data) 232 { 233 struct device *dev = data; 234 235 /* We are only intereted in device addition */ 236 if (action != BUS_NOTIFY_ADD_DEVICE) 237 return 0; 238 239 set_dma_ops(dev, &dma_direct_ops); 240 241 return NOTIFY_DONE; 242 } 243 244 static struct notifier_block dflt_plat_bus_notifier = { 245 .notifier_call = dflt_bus_notify, 246 .priority = INT_MAX, 247 }; 248 249 static int __init setup_bus_notifier(void) 250 { 251 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); 252 253 return 0; 254 } 255 256 arch_initcall(setup_bus_notifier); 257