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 /* 44 * Placed cmd_line to .data section because can be initialized from 45 * ASM code. Default position is BSS section which is cleared 46 * in machine_early_init(). 47 */ 48 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); 49 50 void __init setup_arch(char **cmdline_p) 51 { 52 *cmdline_p = cmd_line; 53 54 console_verbose(); 55 56 unflatten_device_tree(); 57 58 setup_cpuinfo(); 59 60 microblaze_cache_init(); 61 62 setup_memory(); 63 64 #ifdef CONFIG_EARLY_PRINTK 65 /* remap early console to virtual address */ 66 remap_early_printk(); 67 #endif 68 69 xilinx_pci_init(); 70 71 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER) 72 pr_notice("Self modified code enable\n"); 73 #endif 74 75 #ifdef CONFIG_VT 76 #if defined(CONFIG_XILINX_CONSOLE) 77 conswitchp = &xil_con; 78 #elif defined(CONFIG_DUMMY_CONSOLE) 79 conswitchp = &dummy_con; 80 #endif 81 #endif 82 } 83 84 #ifdef CONFIG_MTD_UCLINUX 85 /* Handle both romfs and cramfs types, without generating unnecessary 86 code (ie no point checking for CRAMFS if it's not even enabled) */ 87 inline unsigned get_romfs_len(unsigned *addr) 88 { 89 #ifdef CONFIG_ROMFS_FS 90 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ 91 return be32_to_cpu(addr[2]); 92 #endif 93 94 #ifdef CONFIG_CRAMFS 95 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ 96 return le32_to_cpu(addr[1]); 97 #endif 98 return 0; 99 } 100 #endif /* CONFIG_MTD_UCLINUX_EBSS */ 101 102 unsigned long kernel_tlb; 103 104 void __init machine_early_init(const char *cmdline, unsigned int ram, 105 unsigned int fdt, unsigned int msr, unsigned int tlb0, 106 unsigned int tlb1) 107 { 108 unsigned long *src, *dst; 109 unsigned int offset = 0; 110 111 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 112 * end of kernel. There are two position which we want to check. 113 * The first is __init_end and the second __bss_start. 114 */ 115 #ifdef CONFIG_MTD_UCLINUX 116 int romfs_size; 117 unsigned int romfs_base; 118 char *old_klimit = klimit; 119 120 romfs_base = (ram ? ram : (unsigned int)&__init_end); 121 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 122 if (!romfs_size) { 123 romfs_base = (unsigned int)&__bss_start; 124 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 125 } 126 127 /* Move ROMFS out of BSS before clearing it */ 128 if (romfs_size > 0) { 129 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 130 klimit += romfs_size; 131 } 132 #endif 133 134 /* clearing bss section */ 135 memset(__bss_start, 0, __bss_stop-__bss_start); 136 memset(_ssbss, 0, _esbss-_ssbss); 137 138 lockdep_init(); 139 140 /* initialize device tree for usage in early_printk */ 141 early_init_devtree((void *)_fdt_start); 142 143 #ifdef CONFIG_EARLY_PRINTK 144 setup_early_printk(NULL); 145 #endif 146 147 /* setup kernel_tlb after BSS cleaning 148 * Maybe worth to move to asm code */ 149 kernel_tlb = tlb0 + tlb1; 150 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 151 tlb1, kernel_tlb); */ 152 153 printk("Ramdisk addr 0x%08x, ", ram); 154 if (fdt) 155 printk("FDT at 0x%08x\n", fdt); 156 else 157 printk("Compiled-in FDT at 0x%08x\n", 158 (unsigned int)_fdt_start); 159 160 #ifdef CONFIG_MTD_UCLINUX 161 printk("Found romfs @ 0x%08x (0x%08x)\n", 162 romfs_base, romfs_size); 163 printk("#### klimit %p ####\n", old_klimit); 164 BUG_ON(romfs_size < 0); /* What else can we do? */ 165 166 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 167 romfs_size, romfs_base, (unsigned)&__bss_stop); 168 169 printk("New klimit: 0x%08x\n", (unsigned)klimit); 170 #endif 171 172 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 173 if (msr) 174 printk("!!!Your kernel has setup MSR instruction but " 175 "CPU don't have it %x\n", msr); 176 #else 177 if (!msr) 178 printk("!!!Your kernel not setup MSR instruction but " 179 "CPU have it %x\n", msr); 180 #endif 181 182 /* Do not copy reset vectors. offset = 0x2 means skip the first 183 * two instructions. dst is pointer to MB vectors which are placed 184 * in block ram. If you want to copy reset vector setup offset to 0x0 */ 185 #if !CONFIG_MANUAL_RESET_VECTOR 186 offset = 0x2; 187 #endif 188 dst = (unsigned long *) (offset * sizeof(u32)); 189 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) 190 *dst = *src; 191 192 /* Initialize global data */ 193 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ 194 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; 195 } 196 197 #ifdef CONFIG_DEBUG_FS 198 struct dentry *of_debugfs_root; 199 200 static int microblaze_debugfs_init(void) 201 { 202 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 203 204 return of_debugfs_root == NULL; 205 } 206 arch_initcall(microblaze_debugfs_init); 207 208 # ifdef CONFIG_MMU 209 static int __init debugfs_tlb(void) 210 { 211 struct dentry *d; 212 213 if (!of_debugfs_root) 214 return -ENODEV; 215 216 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 217 if (!d) 218 return -ENOMEM; 219 } 220 device_initcall(debugfs_tlb); 221 # endif 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