diff options
author | Mark A. Greer <mgreer@mvista.com> | 2006-10-16 20:52:09 (GMT) |
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committer | Paul Mackerras <paulus@samba.org> | 2006-10-23 02:49:19 (GMT) |
commit | 0c176fa80fdfa9b4e0753e37223b056994c818d2 (patch) | |
tree | aa45e2bba6f57ac1e85e81f2482667c0873fefa4 /arch/powerpc/boot/serial.c | |
parent | 6fb4efc68f5c0e095153510dcfa8b54a42e914ba (diff) | |
download | linux-fsl-qoriq-0c176fa80fdfa9b4e0753e37223b056994c818d2.tar.xz |
[POWERPC] Add non-OF serial console support
Add serial console support for non-OF systems. There is a generic serial
console layer which calls a serial console driver. Included is the serial
console driver for the ns16550 class of uarts. Necessary support routines
are added as well.
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/boot/serial.c')
-rw-r--r-- | arch/powerpc/boot/serial.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c new file mode 100644 index 0000000..e8de4cf --- /dev/null +++ b/arch/powerpc/boot/serial.c @@ -0,0 +1,142 @@ +/* + * Generic serial console support + * + * Author: Mark A. Greer <mgreer@mvista.com> + * + * Code in serial_edit_cmdline() copied from <file:arch/ppc/boot/simple/misc.c> + * and was written by Matt Porter <mporter@kernel.crashing.org>. + * + * 2001,2006 (c) MontaVista Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + */ +#include <stdarg.h> +#include <stddef.h> +#include "types.h" +#include "string.h" +#include "stdio.h" +#include "io.h" +#include "ops.h" + +extern void udelay(long delay); + +static int serial_open(void) +{ + struct serial_console_data *scdp = console_ops.data; + return scdp->open(); +} + +static void serial_write(char *buf, int len) +{ + struct serial_console_data *scdp = console_ops.data; + + while (*buf != '\0') + scdp->putc(*buf++); +} + +static void serial_edit_cmdline(char *buf, int len) +{ + int timer = 0, count; + char ch, *cp; + struct serial_console_data *scdp = console_ops.data; + + cp = buf; + count = strlen(buf); + cp = &buf[count]; + count++; + + while (timer++ < 5*1000) { + if (scdp->tstc()) { + while (((ch = scdp->getc()) != '\n') && (ch != '\r')) { + /* Test for backspace/delete */ + if ((ch == '\b') || (ch == '\177')) { + if (cp != buf) { + cp--; + count--; + printf("\b \b"); + } + /* Test for ^x/^u (and wipe the line) */ + } else if ((ch == '\030') || (ch == '\025')) { + while (cp != buf) { + cp--; + count--; + printf("\b \b"); + } + } else if (count < len) { + *cp++ = ch; + count++; + scdp->putc(ch); + } + } + break; /* Exit 'timer' loop */ + } + udelay(1000); /* 1 msec */ + } + *cp = 0; +} + +static void serial_close(void) +{ + struct serial_console_data *scdp = console_ops.data; + + if (scdp->close) + scdp->close(); +} + +static void *serial_get_stdout_devp(void) +{ + void *devp; + char devtype[MAX_PROP_LEN]; + char path[MAX_PATH_LEN]; + + devp = finddevice("/chosen"); + if (devp == NULL) + goto err_out; + + if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) { + devp = finddevice(path); + if (devp == NULL) + goto err_out; + + if ((getprop(devp, "device_type", devtype, sizeof(devtype)) > 0) + && !strcmp(devtype, "serial")) + return devp; + } +err_out: + return NULL; +} + +static struct serial_console_data serial_cd; + +/* Node's "compatible" property determines which serial driver to use */ +int serial_console_init(void) +{ + void *devp; + int rc = -1; + char compat[MAX_PROP_LEN]; + + devp = serial_get_stdout_devp(); + if (devp == NULL) + goto err_out; + + if (getprop(devp, "compatible", compat, sizeof(compat)) < 0) + goto err_out; + + if (!strcmp(compat, "ns16550")) + rc = ns16550_console_init(devp, &serial_cd); + + /* Add other serial console driver calls here */ + + if (!rc) { + console_ops.open = serial_open; + console_ops.write = serial_write; + console_ops.edit_cmdline = serial_edit_cmdline; + console_ops.close = serial_close; + console_ops.data = &serial_cd; + + return 0; + } +err_out: + return -1; +} |