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omap4: add serial communications over usb boot 

Signed-off-by: Vicente <vicencb@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Vicente 2012-10-09 00:55:21 +02:00 committed by Sascha Hauer
parent 6b4dc4d4f1
commit ea43a5e296
3 changed files with 91 additions and 0 deletions
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7
drivers/serial/Kconfig
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@ -105,4 +105,11 @@ config DRIVER_SERIAL_PXA
bool "PXA serial driver"
depends on ARCH_PXA
config DRIVER_SERIAL_OMAP4_USBBOOT
bool "serial driver over omap4 usb"
default n
depends on OMAP4_USBBOOT
help
Enable this to get console support over the usb bus used to boot an OMAP4
endmenu

1
drivers/serial/Makefile
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@ -20,3 +20,4 @@ obj-$(CONFIG_DRIVER_SERIAL_S3C) += serial_s3c.o
obj-$(CONFIG_DRIVER_SERIAL_ALTERA) += serial_altera.o
obj-$(CONFIG_DRIVER_SERIAL_ALTERA_JTAG) += serial_altera_jtag.o
obj-$(CONFIG_DRIVER_SERIAL_PXA) += serial_pxa.o
obj-$(CONFIG_DRIVER_SERIAL_OMAP4_USBBOOT) += serial_omap4_usbboot.o

83
drivers/serial/serial_omap4_usbboot.c Normal file
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@ -0,0 +1,83 @@
/*
* 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 <common.h>
#include <init.h>
#include <malloc.h>
#include <errno.h>
#include <mach/omap4_rom_usb.h>
struct serial_omap4_usbboot_priv {
struct console_device cdev;
u32 val;
};
static void serial_omap4_usbboot_putc(struct console_device *cdev, char c)
{
unsigned b = c;
omap4_usbboot_write(&b, 4);
}
static int serial_omap4_usbboot_tstc(struct console_device *cdev)
{
struct serial_omap4_usbboot_priv *priv =
container_of(cdev, struct serial_omap4_usbboot_priv, cdev);
if (omap4_usbboot_is_read_waiting())
return 0;
else if (omap4_usbboot_is_read_ok())
return 1;
omap4_usbboot_queue_read(&priv->val, 4);
udelay(100);
if (omap4_usbboot_is_read_waiting())
return 0;
else if (omap4_usbboot_is_read_ok())
return 1;
return 0;
}
static int serial_omap4_usbboot_getc(struct console_device *cdev)
{
struct serial_omap4_usbboot_priv *priv =
container_of(cdev, struct serial_omap4_usbboot_priv, cdev);
if (omap4_usbboot_is_read_waiting() || omap4_usbboot_is_read_ok()) {
omap4_usbboot_wait_read();
return priv->val;
}
omap4_usbboot_read(&priv->val, 4);
return priv->val;
}
static int serial_omap4_usbboot_probe(struct device_d *dev)
{
struct serial_omap4_usbboot_priv *priv;
priv = xzalloc(sizeof(*priv));
priv->cdev.dev = dev;
priv->cdev.f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
priv->cdev.tstc = serial_omap4_usbboot_tstc;
priv->cdev.putc = serial_omap4_usbboot_putc;
priv->cdev.getc = serial_omap4_usbboot_getc;
priv->cdev.setbrg = NULL;
return console_register(&priv->cdev);
}
static struct driver_d serial_omap4_usbboot_driver = {
.name = "serial_omap4_usbboot",
.probe = serial_omap4_usbboot_probe,
};
static int serial_omap4_usbboot_init(void)
{
return platform_driver_register(&serial_omap4_usbboot_driver);
}
console_initcall(serial_omap4_usbboot_init);