[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / setup_32.c

/*
 * Common prep/pmac/chrp boot and setup code.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/ide.h>
#include <linux/tty.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/console.h>

#include <asm/residual.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/amigappc.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/cputable.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pmac_feature.h>
#include <asm/sections.h>
#include <asm/nvram.h>
#include <asm/xmon.h>
#include <asm/time.h>

#define DBG(fmt...)

#if defined CONFIG_KGDB
#include <asm/kgdb.h>
#endif

extern void platform_init(void);
extern void bootx_init(unsigned long r4, unsigned long phys);

extern void ppc6xx_idle(void);
extern void power4_idle(void);

boot_infos_t *boot_infos;
struct ide_machdep_calls ppc_ide_md;

/* XXX should go elsewhere */
int __irq_offset_value;
EXPORT_SYMBOL(__irq_offset_value);

unsigned long ISA_DMA_THRESHOLD;
unsigned int DMA_MODE_READ;
unsigned int DMA_MODE_WRITE;

int have_of = 1;

#ifdef CONFIG_PPC_MULTIPLATFORM
int _machine = 0;

extern void prep_init(void);
extern void pmac_init(void);
extern void chrp_init(void);

dev_t boot_dev;
#endif /* CONFIG_PPC_MULTIPLATFORM */

#ifdef CONFIG_MAGIC_SYSRQ
unsigned long SYSRQ_KEY = 0x54;
#endif /* CONFIG_MAGIC_SYSRQ */

#ifdef CONFIG_VGA_CONSOLE
unsigned long vgacon_remap_base;
#endif

struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);

/*
 * These are used in binfmt_elf.c to put aux entries on the stack
 * for each elf executable being started.
 */
int dcache_bsize;
int icache_bsize;
int ucache_bsize;

/*
 * We're called here very early in the boot.  We determine the machine
 * type and call the appropriate low-level setup functions.
 *  -- Cort <cort@fsmlabs.com>
 *
 * Note that the kernel may be running at an address which is different
 * from the address that it was linked at, so we must use RELOC/PTRRELOC
 * to access static data (including strings).  -- paulus
 */
unsigned long __init early_init(unsigned long dt_ptr)
{
	unsigned long offset = reloc_offset();

	/* First zero the BSS -- use memset_io, some platforms don't have
	 * caches on yet */
	memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);

	/*
	 * Identify the CPU type and fix up code sections
	 * that depend on which cpu we have.
	 */
	identify_cpu(offset, 0);
	do_cpu_ftr_fixups(offset);

	return KERNELBASE + offset;
}

#ifdef CONFIG_PPC_MULTIPLATFORM
/*
 * The PPC_MULTIPLATFORM version of platform_init...
 */
void __init platform_init(void)
{
	/* if we didn't get any bootinfo telling us what we are... */
	if (_machine == 0) {
		/* prep boot loader tells us if we're prep or not */
		if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
			_machine = _MACH_prep;
	}

#ifdef CONFIG_PPC_PREP
	/* not much more to do here, if prep */
	if (_machine == _MACH_prep) {
		prep_init();
		return;
	}
#endif

#ifdef CONFIG_ADB
	if (strstr(cmd_line, "adb_sync")) {
		extern int __adb_probe_sync;
		__adb_probe_sync = 1;
	}
#endif /* CONFIG_ADB */

	switch (_machine) {
#ifdef CONFIG_PPC_PMAC
	case _MACH_Pmac:
		pmac_init();
		break;
#endif
#ifdef CONFIG_PPC_CHRP
	case _MACH_chrp:
		chrp_init();
		break;
#endif
	}
}
#endif

/*
 * Find out what kind of machine we're on and save any data we need
 * from the early boot process (devtree is copied on pmac by prom_init()).
 * This is called very early on the boot process, after a minimal
 * MMU environment has been set up but before MMU_init is called.
 */
void __init machine_init(unsigned long dt_ptr, unsigned long phys)
{
	early_init_devtree(__va(dt_ptr));

#ifdef CONFIG_CMDLINE
	strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
#endif /* CONFIG_CMDLINE */

	platform_init();

#ifdef CONFIG_6xx
	ppc_md.power_save = ppc6xx_idle;
#endif

	if (ppc_md.progress)
		ppc_md.progress("id mach(): done", 0x200);
}

#ifdef CONFIG_BOOKE_WDT
/* Checks wdt=x and wdt_period=xx command-line option */
int __init early_parse_wdt(char *p)
{
	if (p && strncmp(p, "0", 1) != 0)
	       booke_wdt_enabled = 1;

	return 0;
}
early_param("wdt", early_parse_wdt);

int __init early_parse_wdt_period (char *p)
{
	if (p)
		booke_wdt_period = simple_strtoul(p, NULL, 0);

	return 0;
}
early_param("wdt_period", early_parse_wdt_period);
#endif	/* CONFIG_BOOKE_WDT */

/* Checks "l2cr=xxxx" command-line option */
int __init ppc_setup_l2cr(char *str)
{
	if (cpu_has_feature(CPU_FTR_L2CR)) {
		unsigned long val = simple_strtoul(str, NULL, 0);
		printk(KERN_INFO "l2cr set to %lx\n", val);
		_set_L2CR(0);		/* force invalidate by disable cache */
		_set_L2CR(val);		/* and enable it */
	}
	return 1;
}
__setup("l2cr=", ppc_setup_l2cr);

#ifdef CONFIG_GENERIC_NVRAM

/* Generic nvram hooks used by drivers/char/gen_nvram.c */
unsigned char nvram_read_byte(int addr)
{
	if (ppc_md.nvram_read_val)
		return ppc_md.nvram_read_val(addr);
	return 0xff;
}
EXPORT_SYMBOL(nvram_read_byte);

void nvram_write_byte(unsigned char val, int addr)
{
	if (ppc_md.nvram_write_val)
		ppc_md.nvram_write_val(addr, val);
}
EXPORT_SYMBOL(nvram_write_byte);

void nvram_sync(void)
{
	if (ppc_md.nvram_sync)
		ppc_md.nvram_sync();
}
EXPORT_SYMBOL(nvram_sync);

#endif /* CONFIG_NVRAM */

static struct cpu cpu_devices[NR_CPUS];

int __init ppc_init(void)
{
	int i;

	/* clear the progress line */
	if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);

	/* register CPU devices */
	for (i = 0; i < NR_CPUS; i++)
		if (cpu_possible(i))
			register_cpu(&cpu_devices[i], i, NULL);

	/* call platform init */
	if (ppc_md.init != NULL) {
		ppc_md.init();
	}
	return 0;
}

arch_initcall(ppc_init);

/* Warning, IO base is not yet inited */
void __init setup_arch(char **cmdline_p)
{
	extern char *klimit;
	extern void do_init_bootmem(void);

	/* so udelay does something sensible, assume <= 1000 bogomips */
	loops_per_jiffy = 500000000 / HZ;

	unflatten_device_tree();
	finish_device_tree();

#ifdef CONFIG_BOOTX_TEXT
	init_boot_display();
#endif

#ifdef CONFIG_PPC_PMAC
	/* This could be called "early setup arch", it must be done
	 * now because xmon need it
	 */
	if (_machine == _MACH_Pmac)
		pmac_feature_init();	/* New cool way */
#endif

#ifdef CONFIG_XMON
	xmon_map_scc();
	if (strstr(cmd_line, "xmon"))
		xmon(NULL);
#endif /* CONFIG_XMON */
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);

#if defined(CONFIG_KGDB)
	if (ppc_md.kgdb_map_scc)
		ppc_md.kgdb_map_scc();
	set_debug_traps();
	if (strstr(cmd_line, "gdb")) {
		if (ppc_md.progress)
			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
		printk("kgdb breakpoint activated\n");
		breakpoint();
	}
#endif

	/*
	 * Set cache line size based on type of cpu as a default.
	 * Systems with OF can look in the properties on the cpu node(s)
	 * for a possibly more accurate value.
	 */
	if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
		dcache_bsize = cur_cpu_spec->dcache_bsize;
		icache_bsize = cur_cpu_spec->icache_bsize;
		ucache_bsize = 0;
	} else
		ucache_bsize = dcache_bsize = icache_bsize
			= cur_cpu_spec->dcache_bsize;

	/* reboot on panic */
	panic_timeout = 180;

	init_mm.start_code = PAGE_OFFSET;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) klimit;

	/* Save unparsed command line copy for /proc/cmdline */
	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
	*cmdline_p = cmd_line;

	parse_early_param();

	/* set up the bootmem stuff with available memory */
	do_init_bootmem();
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);

#ifdef CONFIG_PPC_OCP
	/* Initialize OCP device list */
	ocp_early_init();
	if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
#endif

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

	ppc_md.setup_arch();
	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);

	paging_init();

	/* this is for modules since _machine can be a define -- Cort */
	ppc_md.ppc_machine = _machine;
}
Commit	Line	Data
9b6b563c PM	1	/*
	2	* Common prep/pmac/chrp boot and setup code.
	3	*/
	4
	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>
	21
	22	#include <asm/residual.h>
	23	#include <asm/io.h>
	24	#include <asm/prom.h>
	25	#include <asm/processor.h>
	26	#include <asm/pgtable.h>
9b6b563c PM	27	#include <asm/setup.h>
	28	#include <asm/amigappc.h>
	29	#include <asm/smp.h>
	30	#include <asm/elf.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>
	40	#include <asm/xmon.h>
6d7f58b0	41	#include <asm/time.h>
9b6b563c	42
03501dab PM	43	#define DBG(fmt...)
03501dab PM	44
9b6b563c PM	45	#if defined CONFIG_KGDB
	46	#include <asm/kgdb.h>
	47	#endif
	48
	49	extern void platform_init(void);
	50	extern void bootx_init(unsigned long r4, unsigned long phys);
	51
	52	extern void ppc6xx_idle(void);
	53	extern void power4_idle(void);
	54
	55	boot_infos_t *boot_infos;
	56	struct ide_machdep_calls ppc_ide_md;
	57
bbd0abda PM	58	/* XXX should go elsewhere */
	59	int __irq_offset_value;
	60	EXPORT_SYMBOL(__irq_offset_value);
	61
9b6b563c PM	62	unsigned long ISA_DMA_THRESHOLD;
	63	unsigned int DMA_MODE_READ;
	64	unsigned int DMA_MODE_WRITE;
	65
e574d238 PM	66	int have_of = 1;
e574d238 PM	67
9b6b563c PM	68	#ifdef CONFIG_PPC_MULTIPLATFORM
	69	int _machine = 0;
	70
	71	extern void prep_init(void);
	72	extern void pmac_init(void);
	73	extern void chrp_init(void);
	74
	75	dev_t boot_dev;
	76	#endif /* CONFIG_PPC_MULTIPLATFORM */
	77
	78	#ifdef CONFIG_MAGIC_SYSRQ
	79	unsigned long SYSRQ_KEY = 0x54;
	80	#endif /* CONFIG_MAGIC_SYSRQ */
	81
	82	#ifdef CONFIG_VGA_CONSOLE
	83	unsigned long vgacon_remap_base;
	84	#endif
	85
	86	struct machdep_calls ppc_md;
e574d238	87	EXPORT_SYMBOL(ppc_md);
9b6b563c PM	88
	89	/*
	90	* These are used in binfmt_elf.c to put aux entries on the stack
	91	* for each elf executable being started.
	92	*/
	93	int dcache_bsize;
	94	int icache_bsize;
	95	int ucache_bsize;
	96
9b6b563c PM	97	/*
	98	* We're called here very early in the boot. We determine the machine
	99	* type and call the appropriate low-level setup functions.
	100	* -- Cort <cort@fsmlabs.com>
	101	*
	102	* Note that the kernel may be running at an address which is different
	103	* from the address that it was linked at, so we must use RELOC/PTRRELOC
	104	* to access static data (including strings). -- paulus
	105	*/
	106	unsigned long __init early_init(unsigned long dt_ptr)
	107	{
	108	unsigned long offset = reloc_offset();
	109
dd184343 PM	110	/* First zero the BSS -- use memset_io, some platforms don't have
	111	* caches on yet */
	112	memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
	113
9b6b563c PM	114	/*
	115	* Identify the CPU type and fix up code sections
	116	* that depend on which cpu we have.
	117	*/
	118	identify_cpu(offset, 0);
	119	do_cpu_ftr_fixups(offset);
	120
9b6b563c PM	121	return KERNELBASE + offset;
	122	}
	123
9b6b563c PM	124	#ifdef CONFIG_PPC_MULTIPLATFORM
	125	/*
	126	* The PPC_MULTIPLATFORM version of platform_init...
	127	*/
	128	void __init platform_init(void)
	129	{
	130	/* if we didn't get any bootinfo telling us what we are... */
	131	if (_machine == 0) {
	132	/* prep boot loader tells us if we're prep or not */
	133	if ( (unsigned long )(KERNELBASE) == (0xdeadc0de) )
	134	_machine = _MACH_prep;
	135	}
	136
	137	#ifdef CONFIG_PPC_PREP
	138	/* not much more to do here, if prep */
	139	if (_machine == _MACH_prep) {
	140	prep_init();
	141	return;
	142	}
	143	#endif
	144
	145	#ifdef CONFIG_ADB
	146	if (strstr(cmd_line, "adb_sync")) {
	147	extern int __adb_probe_sync;
	148	__adb_probe_sync = 1;
	149	}
	150	#endif /* CONFIG_ADB */
	151
	152	switch (_machine) {
	153	#ifdef CONFIG_PPC_PMAC
	154	case _MACH_Pmac:
	155	pmac_init();
	156	break;
	157	#endif
	158	#ifdef CONFIG_PPC_CHRP
	159	case _MACH_chrp:
	160	chrp_init();
	161	break;
	162	#endif
	163	}
	164	}
03501dab	165	#endif
9b6b563c	166
9b6b563c PM	167	/*
	168	* Find out what kind of machine we're on and save any data we need
	169	* from the early boot process (devtree is copied on pmac by prom_init()).
	170	* This is called very early on the boot process, after a minimal
	171	* MMU environment has been set up but before MMU_init is called.
	172	*/
	173	void __init machine_init(unsigned long dt_ptr, unsigned long phys)
	174	{
	175	early_init_devtree(__va(dt_ptr));
	176
	177	#ifdef CONFIG_CMDLINE
	178	strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
	179	#endif /* CONFIG_CMDLINE */
	180
35499c01 PM	181	platform_init();
35499c01 PM	182
9b6b563c PM	183	#ifdef CONFIG_6xx
	184	ppc_md.power_save = ppc6xx_idle;
	185	#endif
9b6b563c PM	186
	187	if (ppc_md.progress)
	188	ppc_md.progress("id mach(): done", 0x200);
	189	}
	190
	191	#ifdef CONFIG_BOOKE_WDT
	192	/* Checks wdt=x and wdt_period=xx command-line option */
	193	int __init early_parse_wdt(char *p)
	194	{
	195	if (p && strncmp(p, "0", 1) != 0)
	196	booke_wdt_enabled = 1;
	197
	198	return 0;
	199	}
	200	early_param("wdt", early_parse_wdt);
	201
	202	int __init early_parse_wdt_period (char *p)
	203	{
	204	if (p)
	205	booke_wdt_period = simple_strtoul(p, NULL, 0);
	206
	207	return 0;
	208	}
	209	early_param("wdt_period", early_parse_wdt_period);
	210	#endif /* CONFIG_BOOKE_WDT */
	211
	212	/* Checks "l2cr=xxxx" command-line option */
	213	int __init ppc_setup_l2cr(char *str)
	214	{
	215	if (cpu_has_feature(CPU_FTR_L2CR)) {
	216	unsigned long val = simple_strtoul(str, NULL, 0);
	217	printk(KERN_INFO "l2cr set to %lx\n", val);
	218	_set_L2CR(0); /* force invalidate by disable cache */
	219	_set_L2CR(val); /* and enable it */
	220	}
	221	return 1;
	222	}
	223	__setup("l2cr=", ppc_setup_l2cr);
	224
	225	#ifdef CONFIG_GENERIC_NVRAM
	226
	227	/* Generic nvram hooks used by drivers/char/gen_nvram.c */
	228	unsigned char nvram_read_byte(int addr)
	229	{
	230	if (ppc_md.nvram_read_val)
	231	return ppc_md.nvram_read_val(addr);
	232	return 0xff;
	233	}
	234	EXPORT_SYMBOL(nvram_read_byte);
	235
	236	void nvram_write_byte(unsigned char val, int addr)
	237	{
	238	if (ppc_md.nvram_write_val)
	239	ppc_md.nvram_write_val(addr, val);
	240	}
	241	EXPORT_SYMBOL(nvram_write_byte);
	242
	243	void nvram_sync(void)
	244	{
	245	if (ppc_md.nvram_sync)
	246	ppc_md.nvram_sync();
	247	}
	248	EXPORT_SYMBOL(nvram_sync);
	249
250	#endif /* CONFIG_NVRAM */
251
252	static struct cpu cpu_devices[NR_CPUS];
253
254	int __init ppc_init(void)
255	{
256	int i;
257
258	/* clear the progress line */
259	if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
260
261	/* register CPU devices */
262	for (i = 0; i < NR_CPUS; i++)
263	if (cpu_possible(i))
264	register_cpu(&cpu_devices[i], i, NULL);
265
266	/* call platform init */
267	if (ppc_md.init != NULL) {
268	ppc_md.init();
269	}
270	return 0;
271	}
272
273	arch_initcall(ppc_init);
274
275	/* Warning, IO base is not yet inited */
276	void __init setup_arch(char **cmdline_p)
277	{
278	extern char *klimit;
279	extern void do_init_bootmem(void);
280
281	/* so udelay does something sensible, assume <= 1000 bogomips */
282	loops_per_jiffy = 500000000 / HZ;
283
9b6b563c PM	284	unflatten_device_tree();
	285	finish_device_tree();
	286
30cd4a4e PM	287	#ifdef CONFIG_BOOTX_TEXT
	288	init_boot_display();
	289	#endif
	290
03501dab	291	#ifdef CONFIG_PPC_PMAC
9b6b563c PM	292	/* This could be called "early setup arch", it must be done
	293	* now because xmon need it
	294	*/
	295	if (_machine == _MACH_Pmac)
	296	pmac_feature_init(); /* New cool way */
	297	#endif
	298
	299	#ifdef CONFIG_XMON
	300	xmon_map_scc();
	301	if (strstr(cmd_line, "xmon"))
	302	xmon(NULL);
	303	#endif /* CONFIG_XMON */
	304	if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
	305
	306	#if defined(CONFIG_KGDB)
	307	if (ppc_md.kgdb_map_scc)
	308	ppc_md.kgdb_map_scc();
	309	set_debug_traps();
	310	if (strstr(cmd_line, "gdb")) {
	311	if (ppc_md.progress)
	312	ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
	313	printk("kgdb breakpoint activated\n");
	314	breakpoint();
	315	}
	316	#endif
	317
	318	/*
	319	* Set cache line size based on type of cpu as a default.
	320	* Systems with OF can look in the properties on the cpu node(s)
	321	* for a possibly more accurate value.
	322	*/
	323	if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
	324	dcache_bsize = cur_cpu_spec->dcache_bsize;
	325	icache_bsize = cur_cpu_spec->icache_bsize;
	326	ucache_bsize = 0;
	327	} else
	328	ucache_bsize = dcache_bsize = icache_bsize
	329	= cur_cpu_spec->dcache_bsize;
	330
	331	/* reboot on panic */
	332	panic_timeout = 180;
	333
	334	init_mm.start_code = PAGE_OFFSET;
	335	init_mm.end_code = (unsigned long) _etext;
	336	init_mm.end_data = (unsigned long) _edata;
	337	init_mm.brk = (unsigned long) klimit;
	338
	339	/* Save unparsed command line copy for /proc/cmdline */
	340	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
	341	*cmdline_p = cmd_line;
	342
	343	parse_early_param();
	344
	345	/* set up the bootmem stuff with available memory */
	346	do_init_bootmem();
	347	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
	348
	349	#ifdef CONFIG_PPC_OCP
	350	/* Initialize OCP device list */
	351	ocp_early_init();
	352	if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
	353	#endif
	354
	355	#ifdef CONFIG_DUMMY_CONSOLE
356	conswitchp = &dummy_con;
357	#endif
358
359	ppc_md.setup_arch();
360	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
361
362	paging_init();
363
364	/* this is for modules since _machine can be a define -- Cort */
365	ppc_md.ppc_machine = _machine;
366	}