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;
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().
48 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
50 void __init setup_arch(char **cmdline_p)
52 *cmdline_p = cmd_line;
56 unflatten_device_tree();
60 microblaze_cache_init();
64 #ifdef CONFIG_EARLY_PRINTK
65 /* remap early console to virtual address */
71 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
72 pr_notice("Self modified code enable\n");
76 #if defined(CONFIG_XILINX_CONSOLE)
77 conswitchp = &xil_con;
78 #elif defined(CONFIG_DUMMY_CONSOLE)
79 conswitchp = &dummy_con;
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)
89 #ifdef CONFIG_ROMFS_FS
90 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
91 return be32_to_cpu(addr[2]);
95 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
96 return le32_to_cpu(addr[1]);
100 #endif /* CONFIG_MTD_UCLINUX_EBSS */
102 unsigned long kernel_tlb;
104 void __init machine_early_init(const char *cmdline, unsigned int ram,
105 unsigned int fdt, unsigned int msr, unsigned int tlb0,
108 unsigned long *src, *dst;
109 unsigned int offset = 0;
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.
115 #ifdef CONFIG_MTD_UCLINUX
117 unsigned int romfs_base;
118 char *old_klimit = klimit;
120 romfs_base = (ram ? ram : (unsigned int)&__init_end);
121 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
123 romfs_base = (unsigned int)&__bss_start;
124 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
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;
134 /* clearing bss section */
135 memset(__bss_start, 0, __bss_stop-__bss_start);
136 memset(_ssbss, 0, _esbss-_ssbss);
140 /* initialize device tree for usage in early_printk */
141 early_init_devtree((void *)_fdt_start);
143 #ifdef CONFIG_EARLY_PRINTK
144 setup_early_printk(NULL);
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); */
153 printk("Ramdisk addr 0x%08x, ", ram);
155 printk("FDT at 0x%08x\n", fdt);
157 printk("Compiled-in FDT at 0x%08x\n",
158 (unsigned int)_fdt_start);
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? */
166 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
167 romfs_size, romfs_base, (unsigned)&__bss_stop);
169 printk("New klimit: 0x%08x\n", (unsigned)klimit);
172 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
174 printk("!!!Your kernel has setup MSR instruction but "
175 "CPU don't have it %x\n", msr);
178 printk("!!!Your kernel not setup MSR instruction but "
179 "CPU have it %x\n", msr);
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
188 dst = (unsigned long *) (offset * sizeof(u32));
189 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
192 /* Initialize global data */
193 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
194 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
197 #ifdef CONFIG_DEBUG_FS
198 struct dentry *of_debugfs_root;
200 static int microblaze_debugfs_init(void)
202 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
204 return of_debugfs_root == NULL;
206 arch_initcall(microblaze_debugfs_init);
209 static int __init debugfs_tlb(void)
213 if (!of_debugfs_root)
216 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
220 device_initcall(debugfs_tlb);
224 static int dflt_bus_notify(struct notifier_block *nb,
225 unsigned long action, void *data)
227 struct device *dev = data;
229 /* We are only intereted in device addition */
230 if (action != BUS_NOTIFY_ADD_DEVICE)
233 set_dma_ops(dev, &dma_direct_ops);
238 static struct notifier_block dflt_plat_bus_notifier = {
239 .notifier_call = dflt_bus_notify,
243 static int __init setup_bus_notifier(void)
245 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
250 arch_initcall(setup_bus_notifier);