This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / kernel / early_printk.c

diff --git a/arch/sh/kernel/early_printk.c b/arch/sh/kernel/early_printk.c
new file mode 100644 (file)
index 0000000..8c2769c
--- /dev/null
+++ b/arch/sh/kernel/early_printk.c
@@ -0,0 +1,135 @@
+/*
+ * arch/sh/kernel/early_printk.c
+ *
+ *  Copyright (C) 1999, 2000  Niibe Yutaka
+ *  Copyright (C) 2002  M. R. Brown
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_SH_STANDARD_BIOS
+#include <asm/sh_bios.h>
+
+/*
+ *     Print a string through the BIOS
+ */
+static void sh_console_write(struct console *co, const char *s,
+                                unsigned count)
+{
+       sh_bios_console_write(s, count);
+}
+
+/*
+ *     Setup initial baud/bits/parity. We do two things here:
+ *     - construct a cflag setting for the first rs_open()
+ *     - initialize the serial port
+ *     Return non-zero if we didn't find a serial port.
+ */
+static int __init sh_console_setup(struct console *co, char *options)
+{
+       int     cflag = CREAD | HUPCL | CLOCAL;
+
+       /*
+        *      Now construct a cflag setting.
+        *      TODO: this is a totally bogus cflag, as we have
+        *      no idea what serial settings the BIOS is using, or
+        *      even if its using the serial port at all.
+        */
+       cflag |= B115200 | CS8 | /*no parity*/0;
+
+       co->cflag = cflag;
+
+       return 0;
+}
+
+static struct console early_console = {
+       .name           = "bios",
+       .write          = sh_console_write,
+       .setup          = sh_console_setup,
+       .flags          = CON_PRINTBUFFER,
+       .index          = -1,
+};
+#endif
+
+#ifdef CONFIG_EARLY_SCIF_CONSOLE
+#define SCIF_REG       0xffe80000
+
+static void scif_sercon_putc(int c)
+{
+       while (!(ctrl_inw(SCIF_REG + 0x10) & 0x20)) ;
+
+       ctrl_outb(c, SCIF_REG + 12);
+       ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0x9f), SCIF_REG + 0x10);
+
+       if (c == '\n')
+               scif_sercon_putc('\r');
+}
+
+static void scif_sercon_flush(void)
+{
+       ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
+
+       while (!(ctrl_inw(SCIF_REG + 0x10) & 0x40)) ;
+
+       ctrl_outw((ctrl_inw(SCIF_REG + 0x10) & 0xbf), SCIF_REG + 0x10);
+}
+
+static void scif_sercon_write(struct console *con, const char *s, unsigned count)
+{
+       while (count-- > 0)
+               scif_sercon_putc(*s++);
+
+       scif_sercon_flush();
+}
+
+static int __init scif_sercon_setup(struct console *con, char *options)
+{
+       con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
+
+       return 0;
+}
+
+static struct console early_console = {
+       .name           = "sercon",
+       .write          = scif_sercon_write,
+       .setup          = scif_sercon_setup,
+       .flags          = CON_PRINTBUFFER,
+       .index          = -1,
+};
+
+void scif_sercon_init(int baud)
+{
+       ctrl_outw(0, SCIF_REG + 8);
+       ctrl_outw(0, SCIF_REG);
+
+       /* Set baud rate */
+       ctrl_outb((50000000 / (32 * baud)) - 1, SCIF_REG + 4);
+
+       ctrl_outw(12, SCIF_REG + 24);
+       ctrl_outw(8, SCIF_REG + 24);
+       ctrl_outw(0, SCIF_REG + 32);
+       ctrl_outw(0x60, SCIF_REG + 16);
+       ctrl_outw(0, SCIF_REG + 36);
+       ctrl_outw(0x30, SCIF_REG + 8);
+}
+#endif
+
+void __init enable_early_printk(void)
+{
+#ifdef CONFIG_EARLY_SCIF_CONSOLE
+       scif_sercon_init(115200);
+#endif
+       register_console(&early_console);
+}
+
+void disable_early_printk(void)
+{
+       unregister_console(&early_console);
+}
+