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>
33 #include <asm/system.h>
35 #include <asm/pgtable.h>
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 */
43 unsigned int boot_cpuid
;
44 char cmd_line
[COMMAND_LINE_SIZE
];
46 void __init
setup_arch(char **cmdline_p
)
48 *cmdline_p
= cmd_line
;
52 unflatten_device_tree();
54 /* NOTE I think that this function is not necessary to call */
55 /* irq_early_init(); */
58 microblaze_cache_init();
62 #ifdef CONFIG_EARLY_PRINTK
63 /* remap early console to virtual address */
69 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
70 printk(KERN_NOTICE
"Self modified code enable\n");
74 #if defined(CONFIG_XILINX_CONSOLE)
75 conswitchp
= &xil_con
;
76 #elif defined(CONFIG_DUMMY_CONSOLE)
77 conswitchp
= &dummy_con
;
82 #ifdef CONFIG_MTD_UCLINUX
83 /* Handle both romfs and cramfs types, without generating unnecessary
84 code (ie no point checking for CRAMFS if it's not even enabled) */
85 inline unsigned get_romfs_len(unsigned *addr
)
87 #ifdef CONFIG_ROMFS_FS
88 if (memcmp(&addr
[0], "-rom1fs-", 8) == 0) /* romfs */
89 return be32_to_cpu(addr
[2]);
93 if (addr
[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
94 return le32_to_cpu(addr
[1]);
98 #endif /* CONFIG_MTD_UCLINUX_EBSS */
100 unsigned long kernel_tlb
;
102 void __init
machine_early_init(const char *cmdline
, unsigned int ram
,
103 unsigned int fdt
, unsigned int msr
, unsigned int tlb0
,
106 unsigned long *src
, *dst
;
107 unsigned int offset
= 0;
109 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
110 * end of kernel. There are two position which we want to check.
111 * The first is __init_end and the second __bss_start.
113 #ifdef CONFIG_MTD_UCLINUX
115 unsigned int romfs_base
;
116 char *old_klimit
= klimit
;
118 romfs_base
= (ram
? ram
: (unsigned int)&__init_end
);
119 romfs_size
= PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base
));
121 romfs_base
= (unsigned int)&__bss_start
;
122 romfs_size
= PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base
));
125 /* Move ROMFS out of BSS before clearing it */
126 if (romfs_size
> 0) {
127 memmove(&_ebss
, (int *)romfs_base
, romfs_size
);
128 klimit
+= romfs_size
;
132 /* clearing bss section */
133 memset(__bss_start
, 0, __bss_stop
-__bss_start
);
134 memset(_ssbss
, 0, _esbss
-_ssbss
);
136 /* Copy command line passed from bootloader */
137 #ifndef CONFIG_CMDLINE_BOOL
138 if (cmdline
&& cmdline
[0] != '\0')
139 strlcpy(cmd_line
, cmdline
, COMMAND_LINE_SIZE
);
144 /* initialize device tree for usage in early_printk */
145 early_init_devtree((void *)_fdt_start
);
147 #ifdef CONFIG_EARLY_PRINTK
148 setup_early_printk(NULL
);
151 /* setup kernel_tlb after BSS cleaning
152 * Maybe worth to move to asm code */
153 kernel_tlb
= tlb0
+ tlb1
;
154 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
155 tlb1, kernel_tlb); */
157 printk("Ramdisk addr 0x%08x, ", ram
);
159 printk("FDT at 0x%08x\n", fdt
);
161 printk("Compiled-in FDT at 0x%08x\n",
162 (unsigned int)_fdt_start
);
164 #ifdef CONFIG_MTD_UCLINUX
165 printk("Found romfs @ 0x%08x (0x%08x)\n",
166 romfs_base
, romfs_size
);
167 printk("#### klimit %p ####\n", old_klimit
);
168 BUG_ON(romfs_size
< 0); /* What else can we do? */
170 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
171 romfs_size
, romfs_base
, (unsigned)&_ebss
);
173 printk("New klimit: 0x%08x\n", (unsigned)klimit
);
176 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
178 printk("!!!Your kernel has setup MSR instruction but "
179 "CPU don't have it %x\n", msr
);
182 printk("!!!Your kernel not setup MSR instruction but "
183 "CPU have it %x\n", msr
);
186 /* Do not copy reset vectors. offset = 0x2 means skip the first
187 * two instructions. dst is pointer to MB vectors which are placed
188 * in block ram. If you want to copy reset vector setup offset to 0x0 */
189 #if !CONFIG_MANUAL_RESET_VECTOR
192 dst
= (unsigned long *) (offset
* sizeof(u32
));
193 for (src
= __ivt_start
+ offset
; src
< __ivt_end
; src
++, dst
++)
196 /* Initialize global data */
197 per_cpu(KM
, 0) = 0x1; /* We start in kernel mode */
198 per_cpu(CURRENT_SAVE
, 0) = (unsigned long)current
;
201 #ifdef CONFIG_DEBUG_FS
202 struct dentry
*of_debugfs_root
;
204 static int microblaze_debugfs_init(void)
206 of_debugfs_root
= debugfs_create_dir("microblaze", NULL
);
208 return of_debugfs_root
== NULL
;
210 arch_initcall(microblaze_debugfs_init
);
213 static int dflt_bus_notify(struct notifier_block
*nb
,
214 unsigned long action
, void *data
)
216 struct device
*dev
= data
;
218 /* We are only intereted in device addition */
219 if (action
!= BUS_NOTIFY_ADD_DEVICE
)
222 set_dma_ops(dev
, &dma_direct_ops
);
227 static struct notifier_block dflt_plat_bus_notifier
= {
228 .notifier_call
= dflt_bus_notify
,
232 static int __init
setup_bus_notifier(void)
234 bus_register_notifier(&platform_bus_type
, &dflt_plat_bus_notifier
);
239 arch_initcall(setup_bus_notifier
);