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/ide.h>
14#include <linux/tty.h>
15#include <linux/bootmem.h>
16#include <linux/seq_file.h>
17#include <linux/root_dev.h>
18#include <linux/cpu.h>
19#include <linux/console.h>
20
21#include <asm/residual.h>
22#include <asm/io.h>
23#include <asm/prom.h>
24#include <asm/processor.h>
25#include <asm/pgtable.h>
26#include <asm/setup.h>
27#include <asm/amigappc.h>
28#include <asm/smp.h>
29#include <asm/elf.h>
30#include <asm/cputable.h>
31#include <asm/bootx.h>
32#include <asm/btext.h>
33#include <asm/machdep.h>
34#include <asm/uaccess.h>
35#include <asm/system.h>
36#include <asm/pmac_feature.h>
37#include <asm/sections.h>
38#include <asm/nvram.h>
39#include <asm/xmon.h>
40#include <asm/time.h>
41#include <asm/serial.h>
42#include <asm/udbg.h>
43
44#include "setup.h"
45
46#define DBG(fmt...)
47
48#if defined CONFIG_KGDB
49#include <asm/kgdb.h>
50#endif
51
52extern void bootx_init(unsigned long r4, unsigned long phys);
53
54struct ide_machdep_calls ppc_ide_md;
55
56int boot_cpuid;
57EXPORT_SYMBOL_GPL(boot_cpuid);
58int boot_cpuid_phys;
59
60unsigned long ISA_DMA_THRESHOLD;
61unsigned int DMA_MODE_READ;
62unsigned int DMA_MODE_WRITE;
63
64int have_of = 1;
65
66#ifdef CONFIG_VGA_CONSOLE
67unsigned long vgacon_remap_base;
68EXPORT_SYMBOL(vgacon_remap_base);
69#endif
70
71/*
72 * These are used in binfmt_elf.c to put aux entries on the stack
73 * for each elf executable being started.
74 */
75int dcache_bsize;
76int icache_bsize;
77int ucache_bsize;
78
79/*
80 * We're called here very early in the boot.  We determine the machine
81 * type and call the appropriate low-level setup functions.
82 *  -- Cort <cort@fsmlabs.com>
83 *
84 * Note that the kernel may be running at an address which is different
85 * from the address that it was linked at, so we must use RELOC/PTRRELOC
86 * to access static data (including strings).  -- paulus
87 */
88unsigned long __init early_init(unsigned long dt_ptr)
89{
90	unsigned long offset = reloc_offset();
91	struct cpu_spec *spec;
92
93	/* First zero the BSS -- use memset_io, some platforms don't have
94	 * caches on yet */
95	memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
96			__bss_stop - __bss_start);
97
98	/*
99	 * Identify the CPU type and fix up code sections
100	 * that depend on which cpu we have.
101	 */
102	spec = identify_cpu(offset, mfspr(SPRN_PVR));
103
104	do_feature_fixups(spec->cpu_features,
105			  PTRRELOC(&__start___ftr_fixup),
106			  PTRRELOC(&__stop___ftr_fixup));
107
108	return KERNELBASE + offset;
109}
110
111
112/*
113 * Find out what kind of machine we're on and save any data we need
114 * from the early boot process (devtree is copied on pmac by prom_init()).
115 * This is called very early on the boot process, after a minimal
116 * MMU environment has been set up but before MMU_init is called.
117 */
118void __init machine_init(unsigned long dt_ptr, unsigned long phys)
119{
120	/* Enable early debugging if any specified (see udbg.h) */
121	udbg_early_init();
122
123	/* Do some early initialization based on the flat device tree */
124	early_init_devtree(__va(dt_ptr));
125
126	probe_machine();
127
128#ifdef CONFIG_6xx
129	if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
130	    cpu_has_feature(CPU_FTR_CAN_NAP))
131		ppc_md.power_save = ppc6xx_idle;
132#endif
133
134	if (ppc_md.progress)
135		ppc_md.progress("id mach(): done", 0x200);
136}
137
138#ifdef CONFIG_BOOKE_WDT
139/* Checks wdt=x and wdt_period=xx command-line option */
140int __init early_parse_wdt(char *p)
141{
142	if (p && strncmp(p, "0", 1) != 0)
143	       booke_wdt_enabled = 1;
144
145	return 0;
146}
147early_param("wdt", early_parse_wdt);
148
149int __init early_parse_wdt_period (char *p)
150{
151	if (p)
152		booke_wdt_period = simple_strtoul(p, NULL, 0);
153
154	return 0;
155}
156early_param("wdt_period", early_parse_wdt_period);
157#endif	/* CONFIG_BOOKE_WDT */
158
159int __init ppc_setup_l2cr(char *str)
160{
161	if (cpu_has_feature(CPU_FTR_L2CR)) {
162		unsigned long val = simple_strtoul(str, NULL, 0);
163		printk(KERN_INFO "l2cr set to %lx\n", val);
164		_set_L2CR(0);		/* force invalidate by disable cache */
165		_set_L2CR(val);		/* and enable it */
166	}
167	return 1;
168}
169__setup("l2cr=", ppc_setup_l2cr);
170
171#ifdef CONFIG_GENERIC_NVRAM
172
173/* Generic nvram hooks used by drivers/char/gen_nvram.c */
174unsigned char nvram_read_byte(int addr)
175{
176	if (ppc_md.nvram_read_val)
177		return ppc_md.nvram_read_val(addr);
178	return 0xff;
179}
180EXPORT_SYMBOL(nvram_read_byte);
181
182void nvram_write_byte(unsigned char val, int addr)
183{
184	if (ppc_md.nvram_write_val)
185		ppc_md.nvram_write_val(addr, val);
186}
187EXPORT_SYMBOL(nvram_write_byte);
188
189void nvram_sync(void)
190{
191	if (ppc_md.nvram_sync)
192		ppc_md.nvram_sync();
193}
194EXPORT_SYMBOL(nvram_sync);
195
196#endif /* CONFIG_NVRAM */
197
198static DEFINE_PER_CPU(struct cpu, cpu_devices);
199
200int __init ppc_init(void)
201{
202	int cpu;
203
204	/* clear the progress line */
205	if (ppc_md.progress)
206		ppc_md.progress("             ", 0xffff);
207
208	/* register CPU devices */
209	for_each_possible_cpu(cpu) {
210		struct cpu *c = &per_cpu(cpu_devices, cpu);
211		c->hotpluggable = 1;
212		register_cpu(c, cpu);
213	}
214
215	/* call platform init */
216	if (ppc_md.init != NULL) {
217		ppc_md.init();
218	}
219	return 0;
220}
221
222arch_initcall(ppc_init);
223
224/* Warning, IO base is not yet inited */
225void __init setup_arch(char **cmdline_p)
226{
227	*cmdline_p = cmd_line;
228
229	/* so udelay does something sensible, assume <= 1000 bogomips */
230	loops_per_jiffy = 500000000 / HZ;
231
232	unflatten_device_tree();
233	check_for_initrd();
234
235	if (ppc_md.init_early)
236		ppc_md.init_early();
237
238	find_legacy_serial_ports();
239
240	smp_setup_cpu_maps();
241
242	/* Register early console */
243	register_early_udbg_console();
244
245	xmon_setup();
246
247#if defined(CONFIG_KGDB)
248	if (ppc_md.kgdb_map_scc)
249		ppc_md.kgdb_map_scc();
250	set_debug_traps();
251	if (strstr(cmd_line, "gdb")) {
252		if (ppc_md.progress)
253			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
254		printk("kgdb breakpoint activated\n");
255		breakpoint();
256	}
257#endif
258
259	/*
260	 * Set cache line size based on type of cpu as a default.
261	 * Systems with OF can look in the properties on the cpu node(s)
262	 * for a possibly more accurate value.
263	 */
264	if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
265		dcache_bsize = cur_cpu_spec->dcache_bsize;
266		icache_bsize = cur_cpu_spec->icache_bsize;
267		ucache_bsize = 0;
268	} else
269		ucache_bsize = dcache_bsize = icache_bsize
270			= cur_cpu_spec->dcache_bsize;
271
272	/* reboot on panic */
273	panic_timeout = 180;
274
275	if (ppc_md.panic)
276		setup_panic();
277
278	init_mm.start_code = PAGE_OFFSET;
279	init_mm.end_code = (unsigned long) _etext;
280	init_mm.end_data = (unsigned long) _edata;
281	init_mm.brk = klimit;
282
283	/* set up the bootmem stuff with available memory */
284	do_init_bootmem();
285	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
286
287#ifdef CONFIG_DUMMY_CONSOLE
288	conswitchp = &dummy_con;
289#endif
290
291	ppc_md.setup_arch();
292	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
293
294	paging_init();
295}
296