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>
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>
32
33 #include <asm/system.h>
34 #include <asm/prom.h>
35 #include <asm/pgtable.h>
36
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 */
42
43 unsigned int boot_cpuid;
44 char cmd_line[COMMAND_LINE_SIZE];
45
setup_arch(char ** cmdline_p)46 void __init setup_arch(char **cmdline_p)
47 {
48 *cmdline_p = cmd_line;
49
50 console_verbose();
51
52 unflatten_device_tree();
53
54 /* NOTE I think that this function is not necessary to call */
55 /* irq_early_init(); */
56 setup_cpuinfo();
57
58 microblaze_cache_init();
59
60 setup_memory();
61
62 xilinx_pci_init();
63
64 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
65 printk(KERN_NOTICE "Self modified code enable\n");
66 #endif
67
68 #ifdef CONFIG_VT
69 #if defined(CONFIG_XILINX_CONSOLE)
70 conswitchp = &xil_con;
71 #elif defined(CONFIG_DUMMY_CONSOLE)
72 conswitchp = &dummy_con;
73 #endif
74 #endif
75 }
76
77 #ifdef CONFIG_MTD_UCLINUX
78 /* Handle both romfs and cramfs types, without generating unnecessary
79 code (ie no point checking for CRAMFS if it's not even enabled) */
get_romfs_len(unsigned * addr)80 inline unsigned get_romfs_len(unsigned *addr)
81 {
82 #ifdef CONFIG_ROMFS_FS
83 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
84 return be32_to_cpu(addr[2]);
85 #endif
86
87 #ifdef CONFIG_CRAMFS
88 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
89 return le32_to_cpu(addr[1]);
90 #endif
91 return 0;
92 }
93 #endif /* CONFIG_MTD_UCLINUX_EBSS */
94
machine_early_init(const char * cmdline,unsigned int ram,unsigned int fdt,unsigned int msr)95 void __init machine_early_init(const char *cmdline, unsigned int ram,
96 unsigned int fdt, unsigned int msr)
97 {
98 unsigned long *src, *dst;
99 unsigned int offset = 0;
100
101 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
102 * end of kernel. There are two position which we want to check.
103 * The first is __init_end and the second __bss_start.
104 */
105 #ifdef CONFIG_MTD_UCLINUX
106 int romfs_size;
107 unsigned int romfs_base;
108 char *old_klimit = klimit;
109
110 romfs_base = (ram ? ram : (unsigned int)&__init_end);
111 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
112 if (!romfs_size) {
113 romfs_base = (unsigned int)&__bss_start;
114 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
115 }
116
117 /* Move ROMFS out of BSS before clearing it */
118 if (romfs_size > 0) {
119 memmove(&_ebss, (int *)romfs_base, romfs_size);
120 klimit += romfs_size;
121 }
122 #endif
123
124 /* clearing bss section */
125 memset(__bss_start, 0, __bss_stop-__bss_start);
126 memset(_ssbss, 0, _esbss-_ssbss);
127
128 /* Copy command line passed from bootloader */
129 #ifndef CONFIG_CMDLINE_BOOL
130 if (cmdline && cmdline[0] != '\0')
131 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
132 #endif
133
134 lockdep_init();
135
136 /* initialize device tree for usage in early_printk */
137 early_init_devtree((void *)_fdt_start);
138
139 #ifdef CONFIG_EARLY_PRINTK
140 setup_early_printk(NULL);
141 #endif
142
143 eprintk("Ramdisk addr 0x%08x, ", ram);
144 if (fdt)
145 eprintk("FDT at 0x%08x\n", fdt);
146 else
147 eprintk("Compiled-in FDT at 0x%08x\n",
148 (unsigned int)_fdt_start);
149
150 #ifdef CONFIG_MTD_UCLINUX
151 eprintk("Found romfs @ 0x%08x (0x%08x)\n",
152 romfs_base, romfs_size);
153 eprintk("#### klimit %p ####\n", old_klimit);
154 BUG_ON(romfs_size < 0); /* What else can we do? */
155
156 eprintk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
157 romfs_size, romfs_base, (unsigned)&_ebss);
158
159 eprintk("New klimit: 0x%08x\n", (unsigned)klimit);
160 #endif
161
162 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
163 if (msr)
164 eprintk("!!!Your kernel has setup MSR instruction but "
165 "CPU don't have it %x\n", msr);
166 #else
167 if (!msr)
168 eprintk("!!!Your kernel not setup MSR instruction but "
169 "CPU have it %x\n", msr);
170 #endif
171
172 /* Do not copy reset vectors. offset = 0x2 means skip the first
173 * two instructions. dst is pointer to MB vectors which are placed
174 * in block ram. If you want to copy reset vector setup offset to 0x0 */
175 #if !CONFIG_MANUAL_RESET_VECTOR
176 offset = 0x2;
177 #endif
178 dst = (unsigned long *) (offset * sizeof(u32));
179 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
180 *dst = *src;
181
182 /* Initialize global data */
183 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
184 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
185 }
186
187 #ifdef CONFIG_DEBUG_FS
188 struct dentry *of_debugfs_root;
189
microblaze_debugfs_init(void)190 static int microblaze_debugfs_init(void)
191 {
192 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
193
194 return of_debugfs_root == NULL;
195 }
196 arch_initcall(microblaze_debugfs_init);
197 #endif
198
dflt_bus_notify(struct notifier_block * nb,unsigned long action,void * data)199 static int dflt_bus_notify(struct notifier_block *nb,
200 unsigned long action, void *data)
201 {
202 struct device *dev = data;
203
204 /* We are only intereted in device addition */
205 if (action != BUS_NOTIFY_ADD_DEVICE)
206 return 0;
207
208 set_dma_ops(dev, &dma_direct_ops);
209
210 return NOTIFY_DONE;
211 }
212
213 static struct notifier_block dflt_plat_bus_notifier = {
214 .notifier_call = dflt_bus_notify,
215 .priority = INT_MAX,
216 };
217
setup_bus_notifier(void)218 static int __init setup_bus_notifier(void)
219 {
220 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
221
222 return 0;
223 }
224
225 arch_initcall(setup_bus_notifier);
226