2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2007-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
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
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>
19 #include <asm/setup.h>
20 #include <asm/sections.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>
34 #include <asm/pgtable.h>
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 */
42 unsigned int boot_cpuid;
43 char cmd_line[COMMAND_LINE_SIZE];
45 void __init setup_arch(char **cmdline_p)
47 *cmdline_p = cmd_line;
51 unflatten_device_tree();
55 microblaze_cache_init();
59 #ifdef CONFIG_EARLY_PRINTK
60 /* remap early console to virtual address */
66 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
67 printk(KERN_NOTICE "Self modified code enable\n");
71 #if defined(CONFIG_XILINX_CONSOLE)
72 conswitchp = &xil_con;
73 #elif defined(CONFIG_DUMMY_CONSOLE)
74 conswitchp = &dummy_con;
79 #ifdef CONFIG_MTD_UCLINUX
80 /* Handle both romfs and cramfs types, without generating unnecessary
81 code (ie no point checking for CRAMFS if it's not even enabled) */
82 inline unsigned get_romfs_len(unsigned *addr)
84 #ifdef CONFIG_ROMFS_FS
85 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
86 return be32_to_cpu(addr[2]);
90 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
91 return le32_to_cpu(addr[1]);
95 #endif /* CONFIG_MTD_UCLINUX_EBSS */
97 void __init machine_early_init(const char *cmdline, unsigned int ram,
98 unsigned int fdt, unsigned int msr)
100 unsigned long *src, *dst;
101 unsigned int offset = 0;
103 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
104 * end of kernel. There are two position which we want to check.
105 * The first is __init_end and the second __bss_start.
107 #ifdef CONFIG_MTD_UCLINUX
109 unsigned int romfs_base;
110 char *old_klimit = klimit;
112 romfs_base = (ram ? ram : (unsigned int)&__init_end);
113 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
115 romfs_base = (unsigned int)&__bss_start;
116 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
119 /* Move ROMFS out of BSS before clearing it */
120 if (romfs_size > 0) {
121 memmove(&_ebss, (int *)romfs_base, romfs_size);
122 klimit += romfs_size;
126 /* clearing bss section */
127 memset(__bss_start, 0, __bss_stop-__bss_start);
128 memset(_ssbss, 0, _esbss-_ssbss);
130 /* Copy command line passed from bootloader */
131 #ifndef CONFIG_CMDLINE_BOOL
132 if (cmdline && cmdline[0] != '\0')
133 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
138 /* initialize device tree for usage in early_printk */
139 early_init_devtree((void *)_fdt_start);
141 #ifdef CONFIG_EARLY_PRINTK
142 setup_early_printk(NULL);
145 printk("Ramdisk addr 0x%08x, ", ram);
147 printk("FDT at 0x%08x\n", fdt);
149 printk("Compiled-in FDT at 0x%08x\n",
150 (unsigned int)_fdt_start);
152 #ifdef CONFIG_MTD_UCLINUX
153 printk("Found romfs @ 0x%08x (0x%08x)\n",
154 romfs_base, romfs_size);
155 printk("#### klimit %p ####\n", old_klimit);
156 BUG_ON(romfs_size < 0); /* What else can we do? */
158 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
159 romfs_size, romfs_base, (unsigned)&_ebss);
161 printk("New klimit: 0x%08x\n", (unsigned)klimit);
164 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
166 printk("!!!Your kernel has setup MSR instruction but "
167 "CPU don't have it %x\n", msr);
170 printk("!!!Your kernel not setup MSR instruction but "
171 "CPU have it %x\n", msr);
174 /* Do not copy reset vectors. offset = 0x2 means skip the first
175 * two instructions. dst is pointer to MB vectors which are placed
176 * in block ram. If you want to copy reset vector setup offset to 0x0 */
177 #if !CONFIG_MANUAL_RESET_VECTOR
180 dst = (unsigned long *) (offset * sizeof(u32));
181 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
184 /* Initialize global data */
185 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
186 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
189 #ifdef CONFIG_DEBUG_FS
190 struct dentry *of_debugfs_root;
192 static int microblaze_debugfs_init(void)
194 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
196 return of_debugfs_root == NULL;
198 arch_initcall(microblaze_debugfs_init);
201 static int dflt_bus_notify(struct notifier_block *nb,
202 unsigned long action, void *data)
204 struct device *dev = data;
206 /* We are only intereted in device addition */
207 if (action != BUS_NOTIFY_ADD_DEVICE)
210 set_dma_ops(dev, &dma_direct_ops);
215 static struct notifier_block dflt_plat_bus_notifier = {
216 .notifier_call = dflt_bus_notify,
220 static int __init setup_bus_notifier(void)
222 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
227 arch_initcall(setup_bus_notifier);