diff options
Diffstat (limited to 'arch/blackfin/kernel/early_printk.c')
| -rw-r--r-- | arch/blackfin/kernel/early_printk.c | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c deleted file mode 100644 index 4b89af9243d3..000000000000 --- a/arch/blackfin/kernel/early_printk.c +++ /dev/null @@ -1,271 +0,0 @@ -/* - * allow a console to be used for early printk - * derived from arch/x86/kernel/early_printk.c - * - * Copyright 2007-2009 Analog Devices Inc. - * - * Licensed under the GPL-2 - */ - -#include <linux/kernel.h> -#include <linux/sched/debug.h> -#include <linux/init.h> -#include <linux/serial_core.h> -#include <linux/console.h> -#include <linux/string.h> -#include <linux/reboot.h> -#include <asm/blackfin.h> -#include <asm/irq_handler.h> -#include <asm/early_printk.h> - -#ifdef CONFIG_SERIAL_BFIN -extern struct console *bfin_earlyserial_init(unsigned int port, - unsigned int cflag); -#endif -#ifdef CONFIG_BFIN_JTAG_COMM -extern struct console *bfin_jc_early_init(void); -#endif - -/* Default console */ -#define DEFAULT_PORT 0 -#define DEFAULT_CFLAG CS8|B57600 - -/* Default console for early crashes */ -#define DEFAULT_EARLY_PORT "serial,uart0,57600" - -#ifdef CONFIG_SERIAL_CORE -/* What should get here is "0,57600" */ -static struct console * __init earlyserial_init(char *buf) -{ - int baud, bit; - char parity; - unsigned int serial_port = DEFAULT_PORT; - unsigned int cflag = DEFAULT_CFLAG; - - serial_port = simple_strtoul(buf, &buf, 10); - buf++; - - cflag = 0; - baud = simple_strtoul(buf, &buf, 10); - switch (baud) { - case 1200: - cflag |= B1200; - break; - case 2400: - cflag |= B2400; - break; - case 4800: - cflag |= B4800; - break; - case 9600: - cflag |= B9600; - break; - case 19200: - cflag |= B19200; - break; - case 38400: - cflag |= B38400; - break; - case 115200: - cflag |= B115200; - break; - default: - cflag |= B57600; - } - - parity = buf[0]; - buf++; - switch (parity) { - case 'e': - cflag |= PARENB; - break; - case 'o': - cflag |= PARODD; - break; - } - - bit = simple_strtoul(buf, &buf, 10); - switch (bit) { - case 5: - cflag |= CS5; - break; - case 6: - cflag |= CS6; - break; - case 7: - cflag |= CS7; - break; - default: - cflag |= CS8; - } - -#ifdef CONFIG_SERIAL_BFIN - return bfin_earlyserial_init(serial_port, cflag); -#else - return NULL; -#endif - -} -#endif - -int __init setup_early_printk(char *buf) -{ - - /* Crashing in here would be really bad, so check both the var - and the pointer before we start using it - */ - if (!buf) - return 0; - - if (!*buf) - return 0; - - if (early_console != NULL) - return 0; - -#ifdef CONFIG_SERIAL_BFIN - /* Check for Blackfin Serial */ - if (!strncmp(buf, "serial,uart", 11)) { - buf += 11; - early_console = earlyserial_init(buf); - } -#endif - -#ifdef CONFIG_BFIN_JTAG_COMM - /* Check for Blackfin JTAG */ - if (!strncmp(buf, "jtag", 4)) { - buf += 4; - early_console = bfin_jc_early_init(); - } -#endif - -#ifdef CONFIG_FB - /* TODO: add framebuffer console support */ -#endif - - if (likely(early_console)) { - early_console->flags |= CON_BOOT; - - register_console(early_console); - printk(KERN_INFO "early printk enabled on %s%d\n", - early_console->name, - early_console->index); - } - - return 0; -} - -/* - * Set up a temporary Event Vector Table, so if something bad happens before - * the kernel is fully started, it doesn't vector off into somewhere we don't - * know - */ - -asmlinkage void __init init_early_exception_vectors(void) -{ - u32 evt; - SSYNC(); - - /* - * This starts up the shadow buffer, incase anything crashes before - * setup arch - */ - mark_shadow_error(); - early_shadow_puts(linux_banner); - early_shadow_stamp(); - - if (CPUID != bfin_cpuid()) { - early_shadow_puts("Running on wrong machine type, expected"); - early_shadow_reg(CPUID, 16); - early_shadow_puts(", but running on"); - early_shadow_reg(bfin_cpuid(), 16); - early_shadow_puts("\n"); - } - - /* cannot program in software: - * evt0 - emulation (jtag) - * evt1 - reset - */ - for (evt = EVT2; evt <= EVT15; evt += 4) - bfin_write32(evt, early_trap); - CSYNC(); - - /* Set all the return from interrupt, exception, NMI to a known place - * so if we do a RETI, RETX or RETN by mistake - we go somewhere known - * Note - don't change RETS - we are in a subroutine, or - * RETE - since it might screw up if emulator is attached - */ - asm("\tRETI = %0; RETX = %0; RETN = %0;\n" - : : "p"(early_trap)); - -} - -__attribute__((__noreturn__)) -asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr) -{ - /* This can happen before the uart is initialized, so initialize - * the UART now (but only if we are running on the processor we think - * we are compiled for - otherwise we write to MMRs that don't exist, - * and cause other problems. Nothing comes out the UART, but it does - * end up in the __buf_log. - */ - if (likely(early_console == NULL) && CPUID == bfin_cpuid()) - setup_early_printk(DEFAULT_EARLY_PORT); - - if (!shadow_console_enabled()) { - /* crap - we crashed before setup_arch() */ - early_shadow_puts("panic before setup_arch\n"); - early_shadow_puts("IPEND:"); - early_shadow_reg(fp->ipend, 16); - if (fp->seqstat & SEQSTAT_EXCAUSE) { - early_shadow_puts("\nEXCAUSE:"); - early_shadow_reg(fp->seqstat & SEQSTAT_EXCAUSE, 8); - } - if (fp->seqstat & SEQSTAT_HWERRCAUSE) { - early_shadow_puts("\nHWERRCAUSE:"); - early_shadow_reg( - (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14, 8); - } - early_shadow_puts("\nErr @"); - if (fp->ipend & EVT_EVX) - early_shadow_reg(fp->retx, 32); - else - early_shadow_reg(fp->pc, 32); -#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON - early_shadow_puts("\nTrace:"); - if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) { - while (bfin_read_TBUFSTAT() & TBUFCNT) { - early_shadow_puts("\nT :"); - early_shadow_reg(bfin_read_TBUF(), 32); - early_shadow_puts("\n S :"); - early_shadow_reg(bfin_read_TBUF(), 32); - } - } -#endif - early_shadow_puts("\nUse bfin-elf-addr2line to determine " - "function names\n"); - /* - * We should panic(), but we can't - since panic calls printk, - * and printk uses memcpy. - * we want to reboot, but if the machine type is different, - * can't due to machine specific reboot sequences - */ - if (CPUID == bfin_cpuid()) { - early_shadow_puts("Trying to restart\n"); - machine_restart(""); - } - - early_shadow_puts("Halting, since it is not safe to restart\n"); - while (1) - asm volatile ("EMUEXCPT; IDLE;\n"); - - } else { - printk(KERN_EMERG "Early panic\n"); - show_regs(fp); - dump_bfin_trace_buffer(); - } - - panic("Died early"); -} - -early_param("earlyprintk", setup_early_printk); |