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