463ce0e103
This moves the discovery of legacy serial ports to a separate file, makes it common to ppc32 and ppc64, and reworks it to use the new OF address translators to get to the ports early. This new version can also detect some PCI serial cards using legacy chips and will probably match those discovered port with the default console choice. Only ppc64 gets udbg still yet, unifying udbg isn't finished yet. It also adds some speed-probing code to udbg so that the default console can come up at the same speed it was set to by the firmware. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
374 lines
8.2 KiB
C
374 lines
8.2 KiB
C
/*
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* Common prep/pmac/chrp boot and setup code.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/ide.h>
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#include <linux/tty.h>
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#include <linux/bootmem.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/cpu.h>
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#include <linux/console.h>
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#include <asm/residual.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/setup.h>
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#include <asm/amigappc.h>
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#include <asm/smp.h>
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#include <asm/elf.h>
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#include <asm/cputable.h>
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#include <asm/bootx.h>
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#include <asm/btext.h>
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#include <asm/machdep.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/pmac_feature.h>
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#include <asm/sections.h>
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#include <asm/nvram.h>
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#include <asm/xmon.h>
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#include <asm/time.h>
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#include <asm/serial.h>
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#include "setup.h"
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#define DBG(fmt...)
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#if defined CONFIG_KGDB
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#include <asm/kgdb.h>
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#endif
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extern void platform_init(void);
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extern void bootx_init(unsigned long r4, unsigned long phys);
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extern void ppc6xx_idle(void);
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extern void power4_idle(void);
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boot_infos_t *boot_infos;
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struct ide_machdep_calls ppc_ide_md;
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int boot_cpuid;
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EXPORT_SYMBOL_GPL(boot_cpuid);
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int boot_cpuid_phys;
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unsigned long ISA_DMA_THRESHOLD;
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unsigned int DMA_MODE_READ;
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unsigned int DMA_MODE_WRITE;
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int have_of = 1;
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#ifdef CONFIG_PPC_MULTIPLATFORM
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extern void prep_init(void);
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extern void pmac_init(void);
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extern void chrp_init(void);
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dev_t boot_dev;
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#endif /* CONFIG_PPC_MULTIPLATFORM */
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#ifdef CONFIG_MAGIC_SYSRQ
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unsigned long SYSRQ_KEY = 0x54;
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#endif /* CONFIG_MAGIC_SYSRQ */
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#ifdef CONFIG_VGA_CONSOLE
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unsigned long vgacon_remap_base;
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#endif
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struct machdep_calls ppc_md;
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EXPORT_SYMBOL(ppc_md);
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/*
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* These are used in binfmt_elf.c to put aux entries on the stack
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* for each elf executable being started.
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*/
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int dcache_bsize;
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int icache_bsize;
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int ucache_bsize;
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/*
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* We're called here very early in the boot. We determine the machine
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* type and call the appropriate low-level setup functions.
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* -- Cort <cort@fsmlabs.com>
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*
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* Note that the kernel may be running at an address which is different
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* from the address that it was linked at, so we must use RELOC/PTRRELOC
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* to access static data (including strings). -- paulus
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*/
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unsigned long __init early_init(unsigned long dt_ptr)
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{
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unsigned long offset = reloc_offset();
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/* First zero the BSS -- use memset_io, some platforms don't have
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* caches on yet */
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memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
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/*
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* Identify the CPU type and fix up code sections
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* that depend on which cpu we have.
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*/
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identify_cpu(offset, 0);
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do_cpu_ftr_fixups(offset);
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return KERNELBASE + offset;
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}
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#ifdef CONFIG_PPC_MULTIPLATFORM
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/*
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* The PPC_MULTIPLATFORM version of platform_init...
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*/
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void __init platform_init(void)
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{
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/* if we didn't get any bootinfo telling us what we are... */
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if (_machine == 0) {
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/* prep boot loader tells us if we're prep or not */
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if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
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_machine = _MACH_prep;
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}
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#ifdef CONFIG_PPC_PREP
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/* not much more to do here, if prep */
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if (_machine == _MACH_prep) {
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prep_init();
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return;
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}
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#endif
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#ifdef CONFIG_ADB
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if (strstr(cmd_line, "adb_sync")) {
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extern int __adb_probe_sync;
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__adb_probe_sync = 1;
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}
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#endif /* CONFIG_ADB */
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switch (_machine) {
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#ifdef CONFIG_PPC_PMAC
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case _MACH_Pmac:
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pmac_init();
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break;
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#endif
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#ifdef CONFIG_PPC_CHRP
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case _MACH_chrp:
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chrp_init();
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break;
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#endif
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}
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}
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#endif
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/*
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* Find out what kind of machine we're on and save any data we need
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* from the early boot process (devtree is copied on pmac by prom_init()).
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* This is called very early on the boot process, after a minimal
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* MMU environment has been set up but before MMU_init is called.
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*/
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void __init machine_init(unsigned long dt_ptr, unsigned long phys)
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{
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early_init_devtree(__va(dt_ptr));
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#ifdef CONFIG_CMDLINE
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strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
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#endif /* CONFIG_CMDLINE */
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platform_init();
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#ifdef CONFIG_6xx
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ppc_md.power_save = ppc6xx_idle;
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#endif
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if (ppc_md.progress)
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ppc_md.progress("id mach(): done", 0x200);
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}
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#ifdef CONFIG_BOOKE_WDT
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/* Checks wdt=x and wdt_period=xx command-line option */
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int __init early_parse_wdt(char *p)
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{
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if (p && strncmp(p, "0", 1) != 0)
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booke_wdt_enabled = 1;
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return 0;
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}
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early_param("wdt", early_parse_wdt);
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int __init early_parse_wdt_period (char *p)
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{
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if (p)
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booke_wdt_period = simple_strtoul(p, NULL, 0);
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return 0;
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}
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early_param("wdt_period", early_parse_wdt_period);
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#endif /* CONFIG_BOOKE_WDT */
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/* Checks "l2cr=xxxx" command-line option */
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int __init ppc_setup_l2cr(char *str)
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{
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if (cpu_has_feature(CPU_FTR_L2CR)) {
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unsigned long val = simple_strtoul(str, NULL, 0);
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printk(KERN_INFO "l2cr set to %lx\n", val);
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_set_L2CR(0); /* force invalidate by disable cache */
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_set_L2CR(val); /* and enable it */
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}
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return 1;
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}
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__setup("l2cr=", ppc_setup_l2cr);
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#ifdef CONFIG_GENERIC_NVRAM
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/* Generic nvram hooks used by drivers/char/gen_nvram.c */
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unsigned char nvram_read_byte(int addr)
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{
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if (ppc_md.nvram_read_val)
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return ppc_md.nvram_read_val(addr);
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return 0xff;
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}
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EXPORT_SYMBOL(nvram_read_byte);
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void nvram_write_byte(unsigned char val, int addr)
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{
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if (ppc_md.nvram_write_val)
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ppc_md.nvram_write_val(addr, val);
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}
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EXPORT_SYMBOL(nvram_write_byte);
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void nvram_sync(void)
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{
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if (ppc_md.nvram_sync)
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ppc_md.nvram_sync();
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}
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EXPORT_SYMBOL(nvram_sync);
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#endif /* CONFIG_NVRAM */
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static struct cpu cpu_devices[NR_CPUS];
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int __init ppc_init(void)
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{
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int i;
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/* clear the progress line */
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if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
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/* register CPU devices */
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for (i = 0; i < NR_CPUS; i++)
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if (cpu_possible(i))
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register_cpu(&cpu_devices[i], i, NULL);
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/* call platform init */
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if (ppc_md.init != NULL) {
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ppc_md.init();
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}
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return 0;
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}
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arch_initcall(ppc_init);
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/* Warning, IO base is not yet inited */
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void __init setup_arch(char **cmdline_p)
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{
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extern void do_init_bootmem(void);
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/* so udelay does something sensible, assume <= 1000 bogomips */
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loops_per_jiffy = 500000000 / HZ;
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unflatten_device_tree();
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check_for_initrd();
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if (ppc_md.init_early)
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ppc_md.init_early();
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#ifdef CONFIG_PPC_MULTIPLATFORM
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find_legacy_serial_ports();
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#endif
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finish_device_tree();
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smp_setup_cpu_maps();
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#ifdef CONFIG_BOOTX_TEXT
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init_boot_display();
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#endif
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#ifdef CONFIG_PPC_PMAC
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/* This could be called "early setup arch", it must be done
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* now because xmon need it
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*/
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if (_machine == _MACH_Pmac)
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pmac_feature_init(); /* New cool way */
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#endif
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#ifdef CONFIG_XMON_DEFAULT
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xmon_init(1);
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#endif
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#if defined(CONFIG_KGDB)
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if (ppc_md.kgdb_map_scc)
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ppc_md.kgdb_map_scc();
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set_debug_traps();
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if (strstr(cmd_line, "gdb")) {
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if (ppc_md.progress)
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ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
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printk("kgdb breakpoint activated\n");
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breakpoint();
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}
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#endif
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/*
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* Set cache line size based on type of cpu as a default.
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* Systems with OF can look in the properties on the cpu node(s)
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* for a possibly more accurate value.
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*/
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if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
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dcache_bsize = cur_cpu_spec->dcache_bsize;
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icache_bsize = cur_cpu_spec->icache_bsize;
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ucache_bsize = 0;
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} else
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ucache_bsize = dcache_bsize = icache_bsize
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= cur_cpu_spec->dcache_bsize;
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/* reboot on panic */
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panic_timeout = 180;
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init_mm.start_code = PAGE_OFFSET;
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init_mm.end_code = (unsigned long) _etext;
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init_mm.end_data = (unsigned long) _edata;
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init_mm.brk = klimit;
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/* Save unparsed command line copy for /proc/cmdline */
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strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
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*cmdline_p = cmd_line;
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parse_early_param();
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/* set up the bootmem stuff with available memory */
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do_init_bootmem();
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if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
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#ifdef CONFIG_PPC_OCP
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/* Initialize OCP device list */
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ocp_early_init();
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if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
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#endif
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#ifdef CONFIG_DUMMY_CONSOLE
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conswitchp = &dummy_con;
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#endif
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ppc_md.setup_arch();
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if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
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paging_init();
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/* this is for modules since _machine can be a define -- Cort */
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ppc_md.ppc_machine = _machine;
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}
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