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-rw-r--r--Documentation/kernel-parameters.txt3
-rw-r--r--arch/blackfin/Kconfig14
-rw-r--r--arch/blackfin/kernel/Makefile1
-rw-r--r--arch/blackfin/kernel/early_printk.c161
-rw-r--r--drivers/serial/bfin_5xx.c129
-rw-r--r--include/asm-blackfin/early_printk.h28
6 files changed, 307 insertions, 29 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4d175c75124..a57c1f216b2 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -35,6 +35,7 @@ parameter is applicable:
APIC APIC support is enabled.
APM Advanced Power Management support is enabled.
AX25 Appropriate AX.25 support is enabled.
+ BLACKFIN Blackfin architecture is enabled.
DRM Direct Rendering Management support is enabled.
EDD BIOS Enhanced Disk Drive Services (EDD) is enabled
EFI EFI Partitioning (GPT) is enabled
@@ -550,7 +551,7 @@ and is between 256 and 4096 characters. It is defined in the file
dtc3181e= [HW,SCSI]
- earlyprintk= [X86-32,X86-64,SH]
+ earlyprintk= [X86-32,X86-64,SH,BLACKFIN]
earlyprintk=vga
earlyprintk=serial[,ttySn[,baudrate]]
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 26ebb0e8c43..cc789b988f3 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -1164,6 +1164,20 @@ config DEBUG_BFIN_NO_KERN_HWTRACE
Say Y here to disable hardware tracing in some known "jumpy" pieces
of code so that the trace buffer will extend further back.
+config EARLY_PRINTK
+ bool "Early printk"
+ default n
+ help
+ This option enables special console drivers which allow the kernel
+ to print messages very early in the bootup process.
+
+ This is useful for kernel debugging when your machine crashes very
+ early before the console code is initialized. After enabling this
+ feature, you must add "earlyprintk=serial,uart0,57600" to the
+ command line (bootargs). It is safe to say Y here in all cases, as
+ all of this lives in the init section and is thrown away after the
+ kernel boots completely.
+
config DUAL_CORE_TEST_MODULE
tristate "Dual Core Test Module"
depends on (BF561)
diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
index 243883ec6de..8aeb6066b19 100644
--- a/arch/blackfin/kernel/Makefile
+++ b/arch/blackfin/kernel/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_BFIN_DMA_5XX) += bfin_dma_5xx.o
obj-$(CONFIG_DUAL_CORE_TEST_MODULE) += dualcore_test.o
obj-$(CONFIG_KGDB) += kgdb.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c
new file mode 100644
index 00000000000..9bf61706694
--- /dev/null
+++ b/arch/blackfin/kernel/early_printk.c
@@ -0,0 +1,161 @@
+/*
+ * File: arch/blackfin/kernel/early_printk.c
+ * Based on: arch/x86_64/kernel/early_printk.c
+ * Author: Robin Getz <rgetz@blackfin.uclinux.org
+ *
+ * Created: 14Aug2007
+ * Description: allow a console to be used for early printk
+ *
+ * Modified:
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/console.h>
+#include <linux/string.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
+
+static struct console *early_console;
+
+/* Default console
+ * Port n == ttyBFn
+ * cflags == UART output modes
+ */
+#define DEFAULT_PORT 0
+#define DEFAULT_CFLAG CS8|B57600
+
+#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 |= CS5;
+ break;
+ case 7:
+ cflag |= CS5;
+ 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_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;
+}
+
+early_param("earlyprintk", setup_early_printk);
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 1e79ee605d9..5039e2675ab 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -962,30 +962,6 @@ static void __init bfin_serial_init_ports(void)
}
#ifdef CONFIG_SERIAL_BFIN_CONSOLE
-static void bfin_serial_console_putchar(struct uart_port *port, int ch)
-{
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
- while (!(UART_GET_LSR(uart) & THRE))
- barrier();
- UART_PUT_CHAR(uart, ch);
- SSYNC();
-}
-
-/*
- * Interrupts are disabled on entering
- */
-static void
-bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
-{
- struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
- int flags = 0;
-
- spin_lock_irqsave(&uart->port.lock, flags);
- uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
- spin_unlock_irqrestore(&uart->port.lock, flags);
-
-}
-
/*
* If the port was already initialised (eg, by a boot loader),
* try to determine the current setup.
@@ -1038,19 +1014,25 @@ bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
}
pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
}
+#endif
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
+static struct uart_driver bfin_serial_reg;
static int __init
bfin_serial_console_setup(struct console *co, char *options)
{
struct bfin_serial_port *uart;
+# ifdef CONFIG_SERIAL_BFIN_CONSOLE
int baud = 57600;
int bits = 8;
int parity = 'n';
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+# ifdef CONFIG_SERIAL_BFIN_CTSRTS
int flow = 'r';
-#else
+# else
int flow = 'n';
-#endif
+# endif
+# endif
/*
* Check whether an invalid uart number has been specified, and
@@ -1061,15 +1043,45 @@ bfin_serial_console_setup(struct console *co, char *options)
co->index = 0;
uart = &bfin_serial_ports[co->index];
+# ifdef CONFIG_SERIAL_BFIN_CONSOLE
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
bfin_serial_console_get_options(uart, &baud, &parity, &bits);
return uart_set_options(&uart->port, co, baud, parity, bits, flow);
+# else
+ return 0;
+# endif
+}
+#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
+ defined (CONFIG_EARLY_PRINTK) */
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+static void bfin_serial_console_putchar(struct uart_port *port, int ch)
+{
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+ while (!(UART_GET_LSR(uart) & THRE))
+ barrier();
+ UART_PUT_CHAR(uart, ch);
+ SSYNC();
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
+{
+ struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
+ int flags = 0;
+
+ spin_lock_irqsave(&uart->port.lock, flags);
+ uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
+ spin_unlock_irqrestore(&uart->port.lock, flags);
+
}
-static struct uart_driver bfin_serial_reg;
static struct console bfin_serial_console = {
.name = BFIN_SERIAL_NAME,
.write = bfin_serial_console_write,
@@ -1095,7 +1107,68 @@ console_initcall(bfin_serial_rs_console_init);
#define BFIN_SERIAL_CONSOLE &bfin_serial_console
#else
#define BFIN_SERIAL_CONSOLE NULL
+#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
+
+
+#ifdef CONFIG_EARLY_PRINTK
+static __init void early_serial_putc(struct uart_port *port, int ch)
+{
+ unsigned timeout = 0xffff;
+ struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+ while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
+ cpu_relax();
+ UART_PUT_CHAR(uart, ch);
+}
+
+static __init void early_serial_write(struct console *con, const char *s,
+ unsigned int n)
+{
+ struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
+ unsigned int i;
+
+ for (i = 0; i < n; i++, s++) {
+ if (*s == '\n')
+ early_serial_putc(&uart->port, '\r');
+ early_serial_putc(&uart->port, *s);
+ }
+}
+
+static struct __init console bfin_early_serial_console = {
+ .name = "early_BFuart",
+ .write = early_serial_write,
+ .device = uart_console_device,
+ .flags = CON_PRINTBUFFER,
+ .setup = bfin_serial_console_setup,
+ .index = -1,
+ .data = &bfin_serial_reg,
+};
+
+struct console __init *bfin_earlyserial_init(unsigned int port,
+ unsigned int cflag)
+{
+ struct bfin_serial_port *uart;
+ struct ktermios t;
+
+ if (port == -1 || port >= nr_ports)
+ port = 0;
+ bfin_serial_init_ports();
+ bfin_early_serial_console.index = port;
+#ifdef CONFIG_KGDB_UART
+ kgdb_entry_state = 0;
+ init_kgdb_uart();
#endif
+ uart = &bfin_serial_ports[port];
+ t.c_cflag = cflag;
+ t.c_iflag = 0;
+ t.c_oflag = 0;
+ t.c_lflag = ICANON;
+ t.c_line = port;
+ bfin_serial_set_termios(&uart->port, &t, &t);
+ return &bfin_early_serial_console;
+}
+
+#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
static struct uart_driver bfin_serial_reg = {
.owner = THIS_MODULE,
diff --git a/include/asm-blackfin/early_printk.h b/include/asm-blackfin/early_printk.h
new file mode 100644
index 00000000000..110f1c1f845
--- /dev/null
+++ b/include/asm-blackfin/early_printk.h
@@ -0,0 +1,28 @@
+/*
+ * File: include/asm-blackfin/early_printk.h
+ * Author: Robin Getz <rgetz@blackfin.uclinux.org
+ *
+ * Created: 14Aug2007
+ * Description: function prototpyes for early printk
+ *
+ * Modified:
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifdef CONFIG_EARLY_PRINTK
+extern int setup_early_printk(char *);
+#else
+#define setup_early_printk(fmt) do { } while (0)
+#endif /* CONFIG_EARLY_PRINTK */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-04 04:40:34 +0000