2 * Common prep/pmac/chrp boot and setup code.
5 #include <linux/config.h>
6 #include <linux/module.h>
7 #include <linux/string.h>
8 #include <linux/sched.h>
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/reboot.h>
12 #include <linux/delay.h>
13 #include <linux/initrd.h>
14 #include <linux/ide.h>
15 #include <linux/tty.h>
16 #include <linux/bootmem.h>
17 #include <linux/seq_file.h>
18 #include <linux/root_dev.h>
19 #include <linux/cpu.h>
20 #include <linux/console.h>
22 #include <asm/residual.h>
25 #include <asm/processor.h>
26 #include <asm/pgtable.h>
27 #include <asm/setup.h>
28 #include <asm/amigappc.h>
31 #include <asm/cputable.h>
32 #include <asm/bootx.h>
33 #include <asm/btext.h>
34 #include <asm/machdep.h>
35 #include <asm/uaccess.h>
36 #include <asm/system.h>
37 #include <asm/pmac_feature.h>
38 #include <asm/sections.h>
39 #include <asm/nvram.h>
45 #if defined CONFIG_KGDB
49 extern void platform_init(void);
50 extern void bootx_init(unsigned long r4, unsigned long phys);
52 extern void ppc6xx_idle(void);
53 extern void power4_idle(void);
55 boot_infos_t *boot_infos;
56 struct ide_machdep_calls ppc_ide_md;
58 /* XXX should go elsewhere */
59 int __irq_offset_value;
60 EXPORT_SYMBOL(__irq_offset_value);
63 EXPORT_SYMBOL_GPL(boot_cpuid);
66 unsigned long ISA_DMA_THRESHOLD;
67 unsigned int DMA_MODE_READ;
68 unsigned int DMA_MODE_WRITE;
72 #ifdef CONFIG_PPC_MULTIPLATFORM
75 extern void prep_init(void);
76 extern void pmac_init(void);
77 extern void chrp_init(void);
80 #endif /* CONFIG_PPC_MULTIPLATFORM */
82 #ifdef CONFIG_MAGIC_SYSRQ
83 unsigned long SYSRQ_KEY = 0x54;
84 #endif /* CONFIG_MAGIC_SYSRQ */
86 #ifdef CONFIG_VGA_CONSOLE
87 unsigned long vgacon_remap_base;
90 struct machdep_calls ppc_md;
91 EXPORT_SYMBOL(ppc_md);
94 * These are used in binfmt_elf.c to put aux entries on the stack
95 * for each elf executable being started.
102 * We're called here very early in the boot. We determine the machine
103 * type and call the appropriate low-level setup functions.
104 * -- Cort <cort@fsmlabs.com>
106 * Note that the kernel may be running at an address which is different
107 * from the address that it was linked at, so we must use RELOC/PTRRELOC
108 * to access static data (including strings). -- paulus
110 unsigned long __init early_init(unsigned long dt_ptr)
112 unsigned long offset = reloc_offset();
114 /* First zero the BSS -- use memset_io, some platforms don't have
116 memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
119 * Identify the CPU type and fix up code sections
120 * that depend on which cpu we have.
122 identify_cpu(offset, 0);
123 do_cpu_ftr_fixups(offset);
125 return KERNELBASE + offset;
128 #ifdef CONFIG_PPC_MULTIPLATFORM
130 * The PPC_MULTIPLATFORM version of platform_init...
132 void __init platform_init(void)
134 /* if we didn't get any bootinfo telling us what we are... */
136 /* prep boot loader tells us if we're prep or not */
137 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
138 _machine = _MACH_prep;
141 #ifdef CONFIG_PPC_PREP
142 /* not much more to do here, if prep */
143 if (_machine == _MACH_prep) {
150 if (strstr(cmd_line, "adb_sync")) {
151 extern int __adb_probe_sync;
152 __adb_probe_sync = 1;
154 #endif /* CONFIG_ADB */
157 #ifdef CONFIG_PPC_PMAC
162 #ifdef CONFIG_PPC_CHRP
172 * Find out what kind of machine we're on and save any data we need
173 * from the early boot process (devtree is copied on pmac by prom_init()).
174 * This is called very early on the boot process, after a minimal
175 * MMU environment has been set up but before MMU_init is called.
177 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
179 early_init_devtree(__va(dt_ptr));
181 #ifdef CONFIG_CMDLINE
182 strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
183 #endif /* CONFIG_CMDLINE */
188 ppc_md.power_save = ppc6xx_idle;
192 ppc_md.progress("id mach(): done", 0x200);
195 #ifdef CONFIG_BOOKE_WDT
196 /* Checks wdt=x and wdt_period=xx command-line option */
197 int __init early_parse_wdt(char *p)
199 if (p && strncmp(p, "0", 1) != 0)
200 booke_wdt_enabled = 1;
204 early_param("wdt", early_parse_wdt);
206 int __init early_parse_wdt_period (char *p)
209 booke_wdt_period = simple_strtoul(p, NULL, 0);
213 early_param("wdt_period", early_parse_wdt_period);
214 #endif /* CONFIG_BOOKE_WDT */
216 /* Checks "l2cr=xxxx" command-line option */
217 int __init ppc_setup_l2cr(char *str)
219 if (cpu_has_feature(CPU_FTR_L2CR)) {
220 unsigned long val = simple_strtoul(str, NULL, 0);
221 printk(KERN_INFO "l2cr set to %lx\n", val);
222 _set_L2CR(0); /* force invalidate by disable cache */
223 _set_L2CR(val); /* and enable it */
227 __setup("l2cr=", ppc_setup_l2cr);
229 #ifdef CONFIG_GENERIC_NVRAM
231 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
232 unsigned char nvram_read_byte(int addr)
234 if (ppc_md.nvram_read_val)
235 return ppc_md.nvram_read_val(addr);
238 EXPORT_SYMBOL(nvram_read_byte);
240 void nvram_write_byte(unsigned char val, int addr)
242 if (ppc_md.nvram_write_val)
243 ppc_md.nvram_write_val(addr, val);
245 EXPORT_SYMBOL(nvram_write_byte);
247 void nvram_sync(void)
249 if (ppc_md.nvram_sync)
252 EXPORT_SYMBOL(nvram_sync);
254 #endif /* CONFIG_NVRAM */
256 static struct cpu cpu_devices[NR_CPUS];
258 int __init ppc_init(void)
262 /* clear the progress line */
263 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
265 /* register CPU devices */
266 for (i = 0; i < NR_CPUS; i++)
268 register_cpu(&cpu_devices[i], i, NULL);
270 /* call platform init */
271 if (ppc_md.init != NULL) {
277 arch_initcall(ppc_init);
279 /* Warning, IO base is not yet inited */
280 void __init setup_arch(char **cmdline_p)
283 extern void do_init_bootmem(void);
285 /* so udelay does something sensible, assume <= 1000 bogomips */
286 loops_per_jiffy = 500000000 / HZ;
288 unflatten_device_tree();
289 finish_device_tree();
291 smp_setup_cpu_maps();
293 #ifdef CONFIG_BOOTX_TEXT
297 #ifdef CONFIG_PPC_PMAC
298 /* This could be called "early setup arch", it must be done
299 * now because xmon need it
301 if (_machine == _MACH_Pmac)
302 pmac_feature_init(); /* New cool way */
307 if (strstr(cmd_line, "xmon")) {
311 #endif /* CONFIG_XMON */
312 if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
314 #if defined(CONFIG_KGDB)
315 if (ppc_md.kgdb_map_scc)
316 ppc_md.kgdb_map_scc();
318 if (strstr(cmd_line, "gdb")) {
320 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
321 printk("kgdb breakpoint activated\n");
327 * Set cache line size based on type of cpu as a default.
328 * Systems with OF can look in the properties on the cpu node(s)
329 * for a possibly more accurate value.
331 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
332 dcache_bsize = cur_cpu_spec->dcache_bsize;
333 icache_bsize = cur_cpu_spec->icache_bsize;
336 ucache_bsize = dcache_bsize = icache_bsize
337 = cur_cpu_spec->dcache_bsize;
339 /* reboot on panic */
342 init_mm.start_code = PAGE_OFFSET;
343 init_mm.end_code = (unsigned long) _etext;
344 init_mm.end_data = (unsigned long) _edata;
345 init_mm.brk = (unsigned long) klimit;
347 /* Save unparsed command line copy for /proc/cmdline */
348 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
349 *cmdline_p = cmd_line;
353 /* set up the bootmem stuff with available memory */
355 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
357 #ifdef CONFIG_PPC_OCP
358 /* Initialize OCP device list */
360 if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
363 #ifdef CONFIG_DUMMY_CONSOLE
364 conswitchp = &dummy_con;
368 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
372 /* this is for modules since _machine can be a define -- Cort */
373 ppc_md.ppc_machine = _machine;