ef747a5a30b9ccded506dcc547fcd15b91eaa51c
[linux-2.6-microblaze.git] / arch / powerpc / kernel / setup_32.c
1 /*
2  * Common prep/pmac/chrp boot and setup code.
3  */
4
5 #include <linux/module.h>
6 #include <linux/string.h>
7 #include <linux/sched.h>
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/reboot.h>
11 #include <linux/delay.h>
12 #include <linux/initrd.h>
13 #include <linux/tty.h>
14 #include <linux/seq_file.h>
15 #include <linux/root_dev.h>
16 #include <linux/cpu.h>
17 #include <linux/console.h>
18 #include <linux/memblock.h>
19 #include <linux/export.h>
20
21 #include <asm/io.h>
22 #include <asm/prom.h>
23 #include <asm/processor.h>
24 #include <asm/pgtable.h>
25 #include <asm/setup.h>
26 #include <asm/smp.h>
27 #include <asm/elf.h>
28 #include <asm/cputable.h>
29 #include <asm/bootx.h>
30 #include <asm/btext.h>
31 #include <asm/machdep.h>
32 #include <linux/uaccess.h>
33 #include <asm/pmac_feature.h>
34 #include <asm/sections.h>
35 #include <asm/nvram.h>
36 #include <asm/xmon.h>
37 #include <asm/time.h>
38 #include <asm/serial.h>
39 #include <asm/udbg.h>
40 #include <asm/code-patching.h>
41 #include <asm/cpu_has_feature.h>
42 #include <asm/asm-prototypes.h>
43 #include <asm/kdump.h>
44
45 #define DBG(fmt...)
46
47 extern void bootx_init(unsigned long r4, unsigned long phys);
48
49 int boot_cpuid_phys;
50 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
51
52 int smp_hw_index[NR_CPUS];
53 EXPORT_SYMBOL(smp_hw_index);
54
55 unsigned long ISA_DMA_THRESHOLD;
56 unsigned int DMA_MODE_READ;
57 unsigned int DMA_MODE_WRITE;
58
59 EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
60 EXPORT_SYMBOL(DMA_MODE_READ);
61 EXPORT_SYMBOL(DMA_MODE_WRITE);
62
63 /*
64  * We're called here very early in the boot.
65  *
66  * Note that the kernel may be running at an address which is different
67  * from the address that it was linked at, so we must use RELOC/PTRRELOC
68  * to access static data (including strings).  -- paulus
69  */
70 notrace unsigned long __init early_init(unsigned long dt_ptr)
71 {
72         unsigned long offset = reloc_offset();
73
74         /* First zero the BSS -- use memset_io, some platforms don't have
75          * caches on yet */
76         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
77                         __bss_stop - __bss_start);
78
79         /*
80          * Identify the CPU type and fix up code sections
81          * that depend on which cpu we have.
82          */
83         identify_cpu(offset, mfspr(SPRN_PVR));
84
85         apply_feature_fixups();
86
87         return KERNELBASE + offset;
88 }
89
90
91 /*
92  * This is run before start_kernel(), the kernel has been relocated
93  * and we are running with enough of the MMU enabled to have our
94  * proper kernel virtual addresses
95  *
96  * We do the initial parsing of the flat device-tree and prepares
97  * for the MMU to be fully initialized.
98  */
99 extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */
100
101 notrace void __init machine_init(u64 dt_ptr)
102 {
103         unsigned int *addr = &memset_nocache_branch;
104         unsigned long insn;
105
106         /* Configure static keys first, now that we're relocated. */
107         setup_feature_keys();
108
109         /* Enable early debugging if any specified (see udbg.h) */
110         udbg_early_init();
111
112         patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP);
113
114         insn = create_cond_branch(addr, branch_target(addr), 0x820000);
115         patch_instruction(addr, insn);  /* replace b by bne cr0 */
116
117         /* Do some early initialization based on the flat device tree */
118         early_init_devtree(__va(dt_ptr));
119
120         early_init_mmu();
121
122         setup_kdump_trampoline();
123 }
124
125 /* Checks "l2cr=xxxx" command-line option */
126 static int __init ppc_setup_l2cr(char *str)
127 {
128         if (cpu_has_feature(CPU_FTR_L2CR)) {
129                 unsigned long val = simple_strtoul(str, NULL, 0);
130                 printk(KERN_INFO "l2cr set to %lx\n", val);
131                 _set_L2CR(0);           /* force invalidate by disable cache */
132                 _set_L2CR(val);         /* and enable it */
133         }
134         return 1;
135 }
136 __setup("l2cr=", ppc_setup_l2cr);
137
138 /* Checks "l3cr=xxxx" command-line option */
139 static int __init ppc_setup_l3cr(char *str)
140 {
141         if (cpu_has_feature(CPU_FTR_L3CR)) {
142                 unsigned long val = simple_strtoul(str, NULL, 0);
143                 printk(KERN_INFO "l3cr set to %lx\n", val);
144                 _set_L3CR(val);         /* and enable it */
145         }
146         return 1;
147 }
148 __setup("l3cr=", ppc_setup_l3cr);
149
150 #ifdef CONFIG_GENERIC_NVRAM
151
152 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
153 unsigned char nvram_read_byte(int addr)
154 {
155         if (ppc_md.nvram_read_val)
156                 return ppc_md.nvram_read_val(addr);
157         return 0xff;
158 }
159 EXPORT_SYMBOL(nvram_read_byte);
160
161 void nvram_write_byte(unsigned char val, int addr)
162 {
163         if (ppc_md.nvram_write_val)
164                 ppc_md.nvram_write_val(addr, val);
165 }
166 EXPORT_SYMBOL(nvram_write_byte);
167
168 ssize_t nvram_get_size(void)
169 {
170         if (ppc_md.nvram_size)
171                 return ppc_md.nvram_size();
172         return -1;
173 }
174 EXPORT_SYMBOL(nvram_get_size);
175
176 void nvram_sync(void)
177 {
178         if (ppc_md.nvram_sync)
179                 ppc_md.nvram_sync();
180 }
181 EXPORT_SYMBOL(nvram_sync);
182
183 #endif /* CONFIG_NVRAM */
184
185 static int __init ppc_init(void)
186 {
187         /* clear the progress line */
188         if (ppc_md.progress)
189                 ppc_md.progress("             ", 0xffff);
190
191         /* call platform init */
192         if (ppc_md.init != NULL) {
193                 ppc_md.init();
194         }
195         return 0;
196 }
197 arch_initcall(ppc_init);
198
199 void __init irqstack_early_init(void)
200 {
201         unsigned int i;
202
203         /* interrupt stacks must be in lowmem, we get that for free on ppc32
204          * as the memblock is limited to lowmem by default */
205         for_each_possible_cpu(i) {
206                 softirq_ctx[i] = (struct thread_info *)
207                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
208                 hardirq_ctx[i] = (struct thread_info *)
209                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
210         }
211 }
212
213 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
214 void __init exc_lvl_early_init(void)
215 {
216         unsigned int i, hw_cpu;
217
218         /* interrupt stacks must be in lowmem, we get that for free on ppc32
219          * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
220         for_each_possible_cpu(i) {
221 #ifdef CONFIG_SMP
222                 hw_cpu = get_hard_smp_processor_id(i);
223 #else
224                 hw_cpu = 0;
225 #endif
226
227                 critirq_ctx[hw_cpu] = (struct thread_info *)
228                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
229 #ifdef CONFIG_BOOKE
230                 dbgirq_ctx[hw_cpu] = (struct thread_info *)
231                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
232                 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
233                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
234 #endif
235         }
236 }
237 #endif
238
239 void __init setup_power_save(void)
240 {
241 #ifdef CONFIG_6xx
242         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
243             cpu_has_feature(CPU_FTR_CAN_NAP))
244                 ppc_md.power_save = ppc6xx_idle;
245 #endif
246
247 #ifdef CONFIG_E500
248         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
249             cpu_has_feature(CPU_FTR_CAN_NAP))
250                 ppc_md.power_save = e500_idle;
251 #endif
252 }
253
254 __init void initialize_cache_info(void)
255 {
256         /*
257          * Set cache line size based on type of cpu as a default.
258          * Systems with OF can look in the properties on the cpu node(s)
259          * for a possibly more accurate value.
260          */
261         dcache_bsize = cur_cpu_spec->dcache_bsize;
262         icache_bsize = cur_cpu_spec->icache_bsize;
263         ucache_bsize = 0;
264         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
265                 ucache_bsize = icache_bsize = dcache_bsize;
266 }