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ec9f9101 MS |
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> | |
733cc218 | 25 | #include <linux/pci.h> |
ec9f9101 | 26 | #include <linux/cache.h> |
ccfe27d7 MS |
27 | #include <linux/of_platform.h> |
28 | #include <linux/dma-mapping.h> | |
ec9f9101 MS |
29 | #include <asm/cacheflush.h> |
30 | #include <asm/entry.h> | |
31 | #include <asm/cpuinfo.h> | |
32 | ||
ec9f9101 MS |
33 | #include <asm/prom.h> |
34 | #include <asm/pgtable.h> | |
35 | ||
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 */ | |
41 | ||
42 | unsigned int boot_cpuid; | |
fcc1c0ff MS |
43 | /* |
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(). | |
47 | */ | |
48 | char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data"))); | |
ec9f9101 MS |
49 | |
50 | void __init setup_arch(char **cmdline_p) | |
51 | { | |
ec9f9101 MS |
52 | *cmdline_p = cmd_line; |
53 | ||
54 | console_verbose(); | |
55 | ||
56 | unflatten_device_tree(); | |
57 | ||
ec9f9101 MS |
58 | setup_cpuinfo(); |
59 | ||
2ee2ff87 | 60 | microblaze_cache_init(); |
ec9f9101 | 61 | |
ec9f9101 MS |
62 | setup_memory(); |
63 | ||
e721a45f MS |
64 | #ifdef CONFIG_EARLY_PRINTK |
65 | /* remap early console to virtual address */ | |
66 | remap_early_printk(); | |
67 | #endif | |
68 | ||
733cc218 MS |
69 | xilinx_pci_init(); |
70 | ||
ec9f9101 | 71 | #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER) |
aaa5241e | 72 | pr_notice("Self modified code enable\n"); |
ec9f9101 MS |
73 | #endif |
74 | ||
75 | #ifdef CONFIG_VT | |
76 | #if defined(CONFIG_XILINX_CONSOLE) | |
77 | conswitchp = &xil_con; | |
78 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
79 | conswitchp = &dummy_con; | |
80 | #endif | |
81 | #endif | |
82 | } | |
83 | ||
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) | |
88 | { | |
89 | #ifdef CONFIG_ROMFS_FS | |
90 | if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */ | |
91 | return be32_to_cpu(addr[2]); | |
92 | #endif | |
93 | ||
94 | #ifdef CONFIG_CRAMFS | |
95 | if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */ | |
96 | return le32_to_cpu(addr[1]); | |
97 | #endif | |
98 | return 0; | |
99 | } | |
100 | #endif /* CONFIG_MTD_UCLINUX_EBSS */ | |
101 | ||
95b0f9ea MS |
102 | unsigned long kernel_tlb; |
103 | ||
ec9f9101 | 104 | void __init machine_early_init(const char *cmdline, unsigned int ram, |
95b0f9ea MS |
105 | unsigned int fdt, unsigned int msr, unsigned int tlb0, |
106 | unsigned int tlb1) | |
ec9f9101 | 107 | { |
0b9b0200 MS |
108 | unsigned long *src, *dst; |
109 | unsigned int offset = 0; | |
ec9f9101 | 110 | |
cda1fd5a MS |
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. | |
114 | */ | |
115 | #ifdef CONFIG_MTD_UCLINUX | |
116 | int romfs_size; | |
117 | unsigned int romfs_base; | |
118 | char *old_klimit = klimit; | |
119 | ||
120 | romfs_base = (ram ? ram : (unsigned int)&__init_end); | |
121 | romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); | |
122 | if (!romfs_size) { | |
123 | romfs_base = (unsigned int)&__bss_start; | |
124 | romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base)); | |
125 | } | |
126 | ||
127 | /* Move ROMFS out of BSS before clearing it */ | |
128 | if (romfs_size > 0) { | |
363737d6 | 129 | memmove(&__bss_stop, (int *)romfs_base, romfs_size); |
cda1fd5a MS |
130 | klimit += romfs_size; |
131 | } | |
132 | #endif | |
133 | ||
ec9f9101 MS |
134 | /* clearing bss section */ |
135 | memset(__bss_start, 0, __bss_stop-__bss_start); | |
136 | memset(_ssbss, 0, _esbss-_ssbss); | |
137 | ||
bf2d8096 MS |
138 | lockdep_init(); |
139 | ||
ec9f9101 MS |
140 | /* initialize device tree for usage in early_printk */ |
141 | early_init_devtree((void *)_fdt_start); | |
142 | ||
143 | #ifdef CONFIG_EARLY_PRINTK | |
144 | setup_early_printk(NULL); | |
145 | #endif | |
146 | ||
95b0f9ea MS |
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); */ | |
152 | ||
b6d5b28e | 153 | printk("Ramdisk addr 0x%08x, ", ram); |
74510f2a | 154 | if (fdt) |
b6d5b28e | 155 | printk("FDT at 0x%08x\n", fdt); |
74510f2a | 156 | else |
b6d5b28e | 157 | printk("Compiled-in FDT at 0x%08x\n", |
74510f2a | 158 | (unsigned int)_fdt_start); |
ec9f9101 MS |
159 | |
160 | #ifdef CONFIG_MTD_UCLINUX | |
b6d5b28e | 161 | printk("Found romfs @ 0x%08x (0x%08x)\n", |
cda1fd5a | 162 | romfs_base, romfs_size); |
b6d5b28e | 163 | printk("#### klimit %p ####\n", old_klimit); |
cda1fd5a MS |
164 | BUG_ON(romfs_size < 0); /* What else can we do? */ |
165 | ||
b6d5b28e | 166 | printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n", |
363737d6 | 167 | romfs_size, romfs_base, (unsigned)&__bss_stop); |
cda1fd5a | 168 | |
b6d5b28e | 169 | printk("New klimit: 0x%08x\n", (unsigned)klimit); |
ec9f9101 MS |
170 | #endif |
171 | ||
2622434e MS |
172 | #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR |
173 | if (msr) | |
b6d5b28e | 174 | printk("!!!Your kernel has setup MSR instruction but " |
0eb6aaf5 | 175 | "CPU don't have it %x\n", msr); |
2622434e MS |
176 | #else |
177 | if (!msr) | |
b6d5b28e | 178 | printk("!!!Your kernel not setup MSR instruction but " |
0eb6aaf5 | 179 | "CPU have it %x\n", msr); |
2622434e MS |
180 | #endif |
181 | ||
0b9b0200 MS |
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 | |
186 | offset = 0x2; | |
187 | #endif | |
188 | dst = (unsigned long *) (offset * sizeof(u32)); | |
189 | for (src = __ivt_start + offset; src < __ivt_end; src++, dst++) | |
ec9f9101 MS |
190 | *dst = *src; |
191 | ||
192 | /* Initialize global data */ | |
193 | per_cpu(KM, 0) = 0x1; /* We start in kernel mode */ | |
194 | per_cpu(CURRENT_SAVE, 0) = (unsigned long)current; | |
195 | } | |
196 | ||
197 | #ifdef CONFIG_DEBUG_FS | |
198 | struct dentry *of_debugfs_root; | |
199 | ||
200 | static int microblaze_debugfs_init(void) | |
201 | { | |
202 | of_debugfs_root = debugfs_create_dir("microblaze", NULL); | |
203 | ||
204 | return of_debugfs_root == NULL; | |
205 | } | |
206 | arch_initcall(microblaze_debugfs_init); | |
e02db0aa | 207 | |
a28d73ca | 208 | # ifdef CONFIG_MMU |
e02db0aa MS |
209 | static int __init debugfs_tlb(void) |
210 | { | |
211 | struct dentry *d; | |
212 | ||
213 | if (!of_debugfs_root) | |
214 | return -ENODEV; | |
215 | ||
216 | d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip); | |
217 | if (!d) | |
218 | return -ENOMEM; | |
219 | } | |
220 | device_initcall(debugfs_tlb); | |
a28d73ca | 221 | # endif |
ec9f9101 | 222 | #endif |
ccfe27d7 MS |
223 | |
224 | static int dflt_bus_notify(struct notifier_block *nb, | |
225 | unsigned long action, void *data) | |
226 | { | |
227 | struct device *dev = data; | |
228 | ||
229 | /* We are only intereted in device addition */ | |
230 | if (action != BUS_NOTIFY_ADD_DEVICE) | |
231 | return 0; | |
232 | ||
233 | set_dma_ops(dev, &dma_direct_ops); | |
234 | ||
235 | return NOTIFY_DONE; | |
236 | } | |
237 | ||
238 | static struct notifier_block dflt_plat_bus_notifier = { | |
239 | .notifier_call = dflt_bus_notify, | |
240 | .priority = INT_MAX, | |
241 | }; | |
242 | ||
ccfe27d7 MS |
243 | static int __init setup_bus_notifier(void) |
244 | { | |
245 | bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier); | |
ccfe27d7 MS |
246 | |
247 | return 0; | |
248 | } | |
d761f0c5 | 249 | |
9afc4165 | 250 | arch_initcall(setup_bus_notifier); |