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/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;
43 char cmd_line[COMMAND_LINE_SIZE];
44
setup_arch(char ** cmdline_p)45 void __init setup_arch(char **cmdline_p)
46 {
47 *cmdline_p = cmd_line;
48
49 console_verbose();
50
51 unflatten_device_tree();
52
53 setup_cpuinfo();
54
55 microblaze_cache_init();
56
57 setup_memory();
58
59 #ifdef CONFIG_EARLY_PRINTK
60 /* remap early console to virtual address */
61 remap_early_printk();
62 #endif
63
64 xilinx_pci_init();
65
66 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
67 printk(KERN_NOTICE "Self modified code enable\n");
68 #endif
69
70 #ifdef CONFIG_VT
71 #if defined(CONFIG_XILINX_CONSOLE)
72 conswitchp = &xil_con;
73 #elif defined(CONFIG_DUMMY_CONSOLE)
74 conswitchp = &dummy_con;
75 #endif
76 #endif
77 }
78
79 #ifdef CONFIG_MTD_UCLINUX
80 /* Handle both romfs and cramfs types, without generating unnecessary
81 code (ie no point checking for CRAMFS if it's not even enabled) */
get_romfs_len(unsigned * addr)82 inline unsigned get_romfs_len(unsigned *addr)
83 {
84 #ifdef CONFIG_ROMFS_FS
85 if (memcmp(&addr[0], "-rom1fs-", 8) == 0) /* romfs */
86 return be32_to_cpu(addr[2]);
87 #endif
88
89 #ifdef CONFIG_CRAMFS
90 if (addr[0] == le32_to_cpu(0x28cd3d45)) /* cramfs */
91 return le32_to_cpu(addr[1]);
92 #endif
93 return 0;
94 }
95 #endif /* CONFIG_MTD_UCLINUX_EBSS */
96
97 unsigned long kernel_tlb;
98
machine_early_init(const char * cmdline,unsigned int ram,unsigned int fdt,unsigned int msr,unsigned int tlb0,unsigned int tlb1)99 void __init machine_early_init(const char *cmdline, unsigned int ram,
100 unsigned int fdt, unsigned int msr, unsigned int tlb0,
101 unsigned int tlb1)
102 {
103 unsigned long *src, *dst;
104 unsigned int offset = 0;
105
106 /* If CONFIG_MTD_UCLINUX is defined, assume ROMFS is at the
107 * end of kernel. There are two position which we want to check.
108 * The first is __init_end and the second __bss_start.
109 */
110 #ifdef CONFIG_MTD_UCLINUX
111 int romfs_size;
112 unsigned int romfs_base;
113 char *old_klimit = klimit;
114
115 romfs_base = (ram ? ram : (unsigned int)&__init_end);
116 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
117 if (!romfs_size) {
118 romfs_base = (unsigned int)&__bss_start;
119 romfs_size = PAGE_ALIGN(get_romfs_len((unsigned *)romfs_base));
120 }
121
122 /* Move ROMFS out of BSS before clearing it */
123 if (romfs_size > 0) {
124 memmove(&_ebss, (int *)romfs_base, romfs_size);
125 klimit += romfs_size;
126 }
127 #endif
128
129 /* clearing bss section */
130 memset(__bss_start, 0, __bss_stop-__bss_start);
131 memset(_ssbss, 0, _esbss-_ssbss);
132
133 /* Copy command line passed from bootloader */
134 #ifndef CONFIG_CMDLINE_BOOL
135 if (cmdline && cmdline[0] != '\0')
136 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
137 #endif
138
139 lockdep_init();
140
141 /* initialize device tree for usage in early_printk */
142 early_init_devtree((void *)_fdt_start);
143
144 #ifdef CONFIG_EARLY_PRINTK
145 setup_early_printk(NULL);
146 #endif
147
148 /* setup kernel_tlb after BSS cleaning
149 * Maybe worth to move to asm code */
150 kernel_tlb = tlb0 + tlb1;
151 /* printk("TLB1 0x%08x, TLB0 0x%08x, tlb 0x%x\n", tlb0,
152 tlb1, kernel_tlb); */
153
154 printk("Ramdisk addr 0x%08x, ", ram);
155 if (fdt)
156 printk("FDT at 0x%08x\n", fdt);
157 else
158 printk("Compiled-in FDT at 0x%08x\n",
159 (unsigned int)_fdt_start);
160
161 #ifdef CONFIG_MTD_UCLINUX
162 printk("Found romfs @ 0x%08x (0x%08x)\n",
163 romfs_base, romfs_size);
164 printk("#### klimit %p ####\n", old_klimit);
165 BUG_ON(romfs_size < 0); /* What else can we do? */
166
167 printk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
168 romfs_size, romfs_base, (unsigned)&_ebss);
169
170 printk("New klimit: 0x%08x\n", (unsigned)klimit);
171 #endif
172
173 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
174 if (msr)
175 printk("!!!Your kernel has setup MSR instruction but "
176 "CPU don't have it %x\n", msr);
177 #else
178 if (!msr)
179 printk("!!!Your kernel not setup MSR instruction but "
180 "CPU have it %x\n", msr);
181 #endif
182
183 /* Do not copy reset vectors. offset = 0x2 means skip the first
184 * two instructions. dst is pointer to MB vectors which are placed
185 * in block ram. If you want to copy reset vector setup offset to 0x0 */
186 #if !CONFIG_MANUAL_RESET_VECTOR
187 offset = 0x2;
188 #endif
189 dst = (unsigned long *) (offset * sizeof(u32));
190 for (src = __ivt_start + offset; src < __ivt_end; src++, dst++)
191 *dst = *src;
192
193 /* Initialize global data */
194 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
195 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
196 }
197
198 #ifdef CONFIG_DEBUG_FS
199 struct dentry *of_debugfs_root;
200
microblaze_debugfs_init(void)201 static int microblaze_debugfs_init(void)
202 {
203 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
204
205 return of_debugfs_root == NULL;
206 }
207 arch_initcall(microblaze_debugfs_init);
208
209 # ifdef CONFIG_MMU
debugfs_tlb(void)210 static int __init debugfs_tlb(void)
211 {
212 struct dentry *d;
213
214 if (!of_debugfs_root)
215 return -ENODEV;
216
217 d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
218 if (!d)
219 return -ENOMEM;
220 }
221 device_initcall(debugfs_tlb);
222 # endif
223 #endif
224
dflt_bus_notify(struct notifier_block * nb,unsigned long action,void * data)225 static int dflt_bus_notify(struct notifier_block *nb,
226 unsigned long action, void *data)
227 {
228 struct device *dev = data;
229
230 /* We are only intereted in device addition */
231 if (action != BUS_NOTIFY_ADD_DEVICE)
232 return 0;
233
234 set_dma_ops(dev, &dma_direct_ops);
235
236 return NOTIFY_DONE;
237 }
238
239 static struct notifier_block dflt_plat_bus_notifier = {
240 .notifier_call = dflt_bus_notify,
241 .priority = INT_MAX,
242 };
243
setup_bus_notifier(void)244 static int __init setup_bus_notifier(void)
245 {
246 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
247
248 return 0;
249 }
250
251 arch_initcall(setup_bus_notifier);
252