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/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>
22 #include <asm/setup.h>
23 #include <asm/sections.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>
37 #include <asm/pgtable.h>
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 */
45 unsigned int boot_cpuid;
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().
51 char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
53 void __init setup_arch(char **cmdline_p)
55 *cmdline_p = boot_command_line;
59 unflatten_device_tree();
63 microblaze_cache_init();
67 #ifdef CONFIG_EARLY_PRINTK
68 /* remap early console to virtual address */
75 #if defined(CONFIG_XILINX_CONSOLE)
76 conswitchp = &xil_con;
77 #elif defined(CONFIG_DUMMY_CONSOLE)
78 conswitchp = &dummy_con;
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)
88 #ifdef CONFIG_ROMFS_FS
89 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
90 return be32_to_cpu(addr[2]);
94 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
95 return le32_to_cpu(addr[1]);
99 #endif /* CONFIG_MTD_UCLINUX_EBSS */
101 unsigned long kernel_tlb;
103 void __init machine_early_init(const char *cmdline, unsigned int ram,
104 unsigned int fdt, unsigned int msr, unsigned int tlb0,
107 unsigned long *src, *dst;
108 unsigned int offset = 0;
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.
114 #ifdef CONFIG_MTD_UCLINUX
116 unsigned int romfs_base;
117 char *old_klimit = klimit;
119 romfs_base = (ram ? ram : (unsigned int)&__init_end);
120 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
122 romfs_base = (unsigned int)&__bss_start;
123 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
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;
133 /* clearing bss section */
134 memset(__bss_start, 0, __bss_stop-__bss_start);
135 memset(_ssbss, 0, _esbss-_ssbss);
139 /* initialize device tree for usage in early_printk */
140 early_init_devtree(_fdt_start);
142 #ifdef CONFIG_EARLY_PRINTK
143 setup_early_printk(NULL);
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); */
152 pr_info("Ramdisk addr 0x%08x, ", ram);
154 pr_info("FDT at 0x%08x\n", fdt);
156 pr_info("Compiled-in FDT at %p\n", _fdt_start);
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? */
164 pr_info("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
165 romfs_size, romfs_base, (unsigned)&__bss_stop);
167 pr_info("New klimit: 0x%08x\n", (unsigned)klimit);
170 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
172 pr_info("!!!Your kernel has setup MSR instruction but ");
173 pr_cont("CPU don't have it %x\n", msr);
177 pr_info("!!!Your kernel not setup MSR instruction but ");
178 pr_cont("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 void __init time_init(void)
201 clocksource_of_init();
204 #ifdef CONFIG_DEBUG_FS
205 struct dentry *of_debugfs_root;
207 static int microblaze_debugfs_init(void)
209 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
211 return of_debugfs_root == NULL;
213 arch_initcall(microblaze_debugfs_init);
216 static int __init debugfs_tlb(void)
220 if (!of_debugfs_root)
223 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
229 device_initcall(debugfs_tlb);
233 static int dflt_bus_notify(struct notifier_block *nb,
234 unsigned long action, void *data)
236 struct device *dev = data;
238 /* We are only intereted in device addition */
239 if (action != BUS_NOTIFY_ADD_DEVICE)
242 set_dma_ops(dev, &dma_direct_ops);
247 static struct notifier_block dflt_plat_bus_notifier = {
248 .notifier_call = dflt_bus_notify,
252 static int __init setup_bus_notifier(void)
254 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
259 arch_initcall(setup_bus_notifier);