summaryrefslogtreecommitdiff
path: root/arch/blackfin/kernel/early_printk.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/blackfin/kernel/early_printk.c')
-rw-r--r--arch/blackfin/kernel/early_printk.c271
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);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-03 20:09:17 +0300