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/clk-provider.h> 13 #include <linux/clocksource.h> 14 #include <linux/string.h> 15 #include <linux/seq_file.h> 16 #include <linux/cpu.h> 17 #include <linux/initrd.h> 18 #include <linux/console.h> 19 #include <linux/debugfs.h> 20 #include <linux/of_fdt.h> 21 22 #include <asm/setup.h> 23 #include <asm/sections.h> 24 #include <asm/page.h> 25 #include <linux/io.h> 26 #include <linux/bug.h> 27 #include <linux/param.h> 28 #include <linux/pci.h> 29 #include <linux/cache.h> 30 #include <linux/of_platform.h> 31 #include <linux/dma-mapping.h> 32 #include <asm/cacheflush.h> 33 #include <asm/entry.h> 34 #include <asm/cpuinfo.h> 35 36 #include <asm/prom.h> 37 #include <asm/pgtable.h> 38 39 DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */ 40 DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */ 41 DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */ 42 DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */ 43 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */ 44 45 unsigned int boot_cpuid; 46 /* 47 * Placed cmd_line to .data section because can be initialized from 48 * ASM code. Default position is BSS section which is cleared 49 * in machine_early_init(). 50 */ 51 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); 52 53 void __init setup_arch(char **cmdline_p) 54 { 55 *cmdline_p = boot_command_line; 56 57 console_verbose(); 58 59 unflatten_device_tree(); 60 61 setup_cpuinfo(); 62 63 microblaze_cache_init(); 64 65 setup_memory(); 66 67 #ifdef CONFIG_EARLY_PRINTK 68 /* remap early console to virtual address */ 69 remap_early_printk(); 70 #endif 71 72 xilinx_pci_init(); 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 unsigned long kernel_tlb; 102 103 void __init machine_early_init(const char *cmdline, unsigned int ram, 104 unsigned int fdt, unsigned int msr, unsigned int tlb0, 105 unsigned int tlb1) 106 { 107 unsigned long *src, *dst; 108 unsigned int offset = 0; 109 110 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the 111 * end of kernel. There are two position which we want to check. 112 * The first is __init_end and the second __bss_start. 113 */ 114 #ifdef CONFIG_MTD_UCLINUX 115 int romfs_size; 116 unsigned int romfs_base; 117 char *old_klimit = klimit; 118 119 romfs_base = (ram ? ram : (unsigned int)&__init_end); 120 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 121 if (!romfs_size) { 122 romfs_base = (unsigned int)&__bss_start; 123 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); 124 } 125 126 /* Move ROMFS out of BSS before clearing it */ 127 if (romfs_size > 0) { 128 memmove(&__bss_stop, (int *)romfs_base, romfs_size); 129 klimit += romfs_size; 130 } 131 #endif 132 133 /* clearing bss section */ 134 memset(__bss_start, 0, __bss_stop-__bss_start); 135 memset(_ssbss, 0, _esbss-_ssbss); 136 137 lockdep_init(); 138 139 /* initialize device tree for usage in early_printk */ 140 early_init_devtree(_fdt_start); 141 142 #ifdef CONFIG_EARLY_PRINTK 143 setup_early_printk(NULL); 144 #endif 145 146 /* setup kernel_tlb after BSS cleaning 147 * Maybe worth to move to asm code */ 148 kernel_tlb = tlb0 + tlb1; 149 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0, 150 tlb1, kernel_tlb); */ 151 152 pr_info("Ramdisk addr 0x%08x, ", ram); 153 if (fdt) 154 pr_info("FDT at 0x%08x\n", fdt); 155 else 156 pr_info("Compiled-in FDT at %p\n", _fdt_start); 157 158 #ifdef CONFIG_MTD_UCLINUX 159 pr_info("Found romfs @ 0x%08x (0x%08x)\n", 160 romfs_base, romfs_size); 161 pr_info("#### klimit %p ####\n", old_klimit); 162 BUG_ON(romfs_size < 0); /* What else can we do? */ 163 164 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", 165 romfs_size, romfs_base, (unsigned)&__bss_stop); 166 167 pr_info("New klimit: 0x%08x\n", (unsigned)klimit); 168 #endif 169 170 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR 171 if (msr) { 172 pr_info("!!!Your kernel has setup MSR instruction but "); 173 pr_cont("CPU don't have it %x\n", msr); 174 } 175 #else 176 if (!msr) { 177 pr_info("!!!Your kernel not setup MSR instruction but "); 178 pr_cont("CPU have it %x\n", msr); 179 } 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 void __init time_init(void) 198 { 199 of_clk_init(NULL); 200 setup_cpuinfo_clk(); 201 clocksource_of_init(); 202 } 203 204 #ifdef CONFIG_DEBUG_FS 205 struct dentry *of_debugfs_root; 206 207 static int microblaze_debugfs_init(void) 208 { 209 of_debugfs_root = debugfs_create_dir("microblaze", NULL); 210 211 return of_debugfs_root == NULL; 212 } 213 arch_initcall(microblaze_debugfs_init); 214 215 # ifdef CONFIG_MMU 216 static int __init debugfs_tlb(void) 217 { 218 struct dentry *d; 219 220 if (!of_debugfs_root) 221 return -ENODEV; 222 223 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); 224 if (!d) 225 return -ENOMEM; 226 227 return 0; 228 } 229 device_initcall(debugfs_tlb); 230 # endif 231 #endif 232 233 static int dflt_bus_notify(struct notifier_block *nb, 234 unsigned long action, void *data) 235 { 236 struct device *dev = data; 237 238 /* We are only intereted in device addition */ 239 if (action != BUS_NOTIFY_ADD_DEVICE) 240 return 0; 241 242 set_dma_ops(dev, &dma_direct_ops); 243 244 return NOTIFY_DONE; 245 } 246 247 static struct notifier_block dflt_plat_bus_notifier = { 248 .notifier_call = dflt_bus_notify, 249 .priority = INT_MAX, 250 }; 251 252 static int __init setup_bus_notifier(void) 253 { 254 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); 255 256 return 0; 257 } 258 259 arch_initcall(setup_bus_notifier); 260