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Michal Simekec9f9102009-03-27 14:25:24 +01001/*
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>
Michal Simek733cc212010-01-18 15:27:11 +010025#include <linux/pci.h>
Michal Simekec9f9102009-03-27 14:25:24 +010026#include <linux/cache.h>
Michal Simekccfe27d2010-01-14 11:21:02 +010027#include <linux/of_platform.h>
28#include <linux/dma-mapping.h>
Michal Simekec9f9102009-03-27 14:25:24 +010029#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
37DEFINE_PER_CPU(unsigned int, KSP); /* Saved kernel stack pointer */
38DEFINE_PER_CPU(unsigned int, KM); /* Kernel/user mode */
39DEFINE_PER_CPU(unsigned int, ENTRY_SP); /* Saved SP on kernel entry */
40DEFINE_PER_CPU(unsigned int, R11_SAVE); /* Temp variable for entry */
41DEFINE_PER_CPU(unsigned int, CURRENT_SAVE); /* Saved current pointer */
42
43unsigned int boot_cpuid;
44char cmd_line[COMMAND_LINE_SIZE];
45
46void __init setup_arch(char **cmdline_p)
47{
Michal Simekec9f9102009-03-27 14:25:24 +010048 *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
Michal Simek2ee2ff82009-12-10 11:43:57 +010058 microblaze_cache_init();
Michal Simekec9f9102009-03-27 14:25:24 +010059
Michal Simekec9f9102009-03-27 14:25:24 +010060 setup_memory();
61
Michal Simek733cc212010-01-18 15:27:11 +010062 xilinx_pci_init();
63
Michal Simekec9f9102009-03-27 14:25:24 +010064#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) */
80inline 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
Michal Simek6059b3c2010-03-24 11:07:10 +010095#if defined(CONFIG_EARLY_PRINTK) && defined(CONFIG_SERIAL_UARTLITE_CONSOLE)
96#define eprintk early_printk
97#else
98#define eprintk printk
99#endif
100
Michal Simekec9f9102009-03-27 14:25:24 +0100101void __init machine_early_init(const char *cmdline, unsigned int ram,
Michal Simek26224342009-07-30 14:31:23 +0200102 unsigned int fdt, unsigned int msr)
Michal Simekec9f9102009-03-27 14:25:24 +0100103{
104 unsigned long *src, *dst = (unsigned long *)0x0;
105
Michal Simekcda1fd52009-05-19 14:33:47 +0200106 /* 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
Michal Simekec9f9102009-03-27 14:25:24 +0100129/* clearing bss section */
130 memset(__bss_start, 0, __bss_stop-__bss_start);
131 memset(_ssbss, 0, _esbss-_ssbss);
132
Michal Simek1dff89a2009-05-21 08:20:30 +0200133 /* Copy command line passed from bootloader */
Michal Simekec9f9102009-03-27 14:25:24 +0100134#ifndef CONFIG_CMDLINE_BOOL
135 if (cmdline && cmdline[0] != '\0')
136 strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
137#endif
138
Michal Simekbf2d8092009-12-10 12:07:02 +0100139 lockdep_init();
140
Michal Simekec9f9102009-03-27 14:25:24 +0100141/* 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
Michal Simek6059b3c2010-03-24 11:07:10 +0100148 eprintk("Ramdisk addr 0x%08x, ", ram);
Michal Simek74510f22009-06-22 10:28:40 +0200149 if (fdt)
Michal Simek6059b3c2010-03-24 11:07:10 +0100150 eprintk("FDT at 0x%08x\n", fdt);
Michal Simek74510f22009-06-22 10:28:40 +0200151 else
Michal Simek6059b3c2010-03-24 11:07:10 +0100152 eprintk("Compiled-in FDT at 0x%08x\n",
Michal Simek74510f22009-06-22 10:28:40 +0200153 (unsigned int)_fdt_start);
Michal Simekec9f9102009-03-27 14:25:24 +0100154
155#ifdef CONFIG_MTD_UCLINUX
Michal Simek6059b3c2010-03-24 11:07:10 +0100156 eprintk("Found romfs @ 0x%08x (0x%08x)\n",
Michal Simekcda1fd52009-05-19 14:33:47 +0200157 romfs_base, romfs_size);
Michal Simek6059b3c2010-03-24 11:07:10 +0100158 eprintk("#### klimit %p ####\n", old_klimit);
Michal Simekcda1fd52009-05-19 14:33:47 +0200159 BUG_ON(romfs_size < 0); /* What else can we do? */
Michal Simekec9f9102009-03-27 14:25:24 +0100160
Michal Simek6059b3c2010-03-24 11:07:10 +0100161 eprintk("Moved 0x%08x bytes from 0x%08x to 0x%08x\n",
Michal Simekcda1fd52009-05-19 14:33:47 +0200162 romfs_size, romfs_base, (unsigned)&_ebss);
Michal Simekec9f9102009-03-27 14:25:24 +0100163
Michal Simek6059b3c2010-03-24 11:07:10 +0100164 eprintk("New klimit: 0x%08x\n", (unsigned)klimit);
Michal Simekec9f9102009-03-27 14:25:24 +0100165#endif
166
Michal Simek26224342009-07-30 14:31:23 +0200167#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
168 if (msr)
Michal Simek6059b3c2010-03-24 11:07:10 +0100169 eprintk("!!!Your kernel has setup MSR instruction but "
Michal Simek26224342009-07-30 14:31:23 +0200170 "CPU don't have it %d\n", msr);
171#else
172 if (!msr)
Michal Simek6059b3c2010-03-24 11:07:10 +0100173 eprintk("!!!Your kernel not setup MSR instruction but "
Michal Simek26224342009-07-30 14:31:23 +0200174 "CPU have it %d\n", msr);
175#endif
176
Michal Simekec9f9102009-03-27 14:25:24 +0100177 for (src = __ivt_start; src < __ivt_end; src++, dst++)
178 *dst = *src;
179
180 /* Initialize global data */
181 per_cpu(KM, 0) = 0x1; /* We start in kernel mode */
182 per_cpu(CURRENT_SAVE, 0) = (unsigned long)current;
183}
184
185#ifdef CONFIG_DEBUG_FS
186struct dentry *of_debugfs_root;
187
188static int microblaze_debugfs_init(void)
189{
190 of_debugfs_root = debugfs_create_dir("microblaze", NULL);
191
192 return of_debugfs_root == NULL;
193}
194arch_initcall(microblaze_debugfs_init);
195#endif
Michal Simekccfe27d2010-01-14 11:21:02 +0100196
197static int dflt_bus_notify(struct notifier_block *nb,
198 unsigned long action, void *data)
199{
200 struct device *dev = data;
201
202 /* We are only intereted in device addition */
203 if (action != BUS_NOTIFY_ADD_DEVICE)
204 return 0;
205
206 set_dma_ops(dev, &dma_direct_ops);
207
208 return NOTIFY_DONE;
209}
210
211static struct notifier_block dflt_plat_bus_notifier = {
212 .notifier_call = dflt_bus_notify,
213 .priority = INT_MAX,
214};
215
Michal Simekccfe27d2010-01-14 11:21:02 +0100216static int __init setup_bus_notifier(void)
217{
218 bus_register_notifier(&platform_bus_type, &dflt_plat_bus_notifier);
Michal Simekccfe27d2010-01-14 11:21:02 +0100219
220 return 0;
221}
222
223arch_initcall(setup_bus_notifier);