[PATCH 5/7] add console support over the same USB used for booting

[vj <vicencb@gmail.com>]

---
 drivers/serial/Kconfig      |  7 +++++
 drivers/serial/Makefile     |  1 +
 drivers/serial/serial_usb.c | 64 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 72 insertions(+)
 create mode 100644 drivers/serial/serial_usb.c

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 7eb96ed..4e85e1f 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -100,4 +100,11 @@ config DRIVER_SERIAL_PXA
 	bool "PXA serial driver"
 	depends on ARCH_PXA
 
+config DRIVER_SERIAL_USB
+	bool "serial driver over omap4 usb"
+	default n
+	depends on USB_BOOT
+	help
+	  Enable this to get console support over the usb bus used to boot an OMAP4
+
 endmenu
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index e2d56b9..a89bb44 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -19,3 +19,4 @@ 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_USB)			+= serial_usb.o
diff --git a/drivers/serial/serial_usb.c b/drivers/serial/serial_usb.c
new file mode 100644
index 0000000..25391db
--- /dev/null
+++ b/drivers/serial/serial_usb.c
@@ -0,0 +1,64 @@
+/*
+ * Use of usb-port as a serial communications port
+*/
+
+#include <common.h>
+#include <init.h>
+#include <malloc.h>
+#include <errno.h>
+#include <mach/omap4_rom_usb.h>
+
+struct serial_usb_priv {
+	struct console_device cdev;
+	int val;
+};
+
+static void serial_usb_putc(struct console_device *cdev, char c){
+	unsigned b = c;
+	usb_write(&b, 4);
+}
+
+static int serial_usb_tstc(struct console_device *cdev){
+	struct serial_usb_priv *priv = container_of(cdev, struct serial_usb_priv, cdev);
+	if(pusb->dread.status == -1 || pusb->dread.status == STATUS_WAITING)
+		return 0;
+	else if(pusb->dread.status != STATUS_OKAY)
+		usb_queue_read(&priv->val, 4);
+	return pusb->dread.status == STATUS_OKAY;
+}
+
+static int serial_usb_getc(struct console_device *cdev){
+	struct serial_usb_priv *priv = container_of(cdev, struct serial_usb_priv, cdev);
+	if(pusb->dread.status == -1 || pusb->dread.status == STATUS_WAITING)
+		;
+	else if(pusb->dread.status != STATUS_OKAY)
+		usb_queue_read(&priv->val, 4);
+	usb_wait_read();
+	pusb->dread.status = -2;
+	return priv->val;
+}
+
+static int serial_usb_probe(struct device_d *dev){
+	struct serial_usb_priv *priv;
+	priv = xzalloc(sizeof(*priv));
+	pusb->dread.status=-2;
+
+	priv->cdev.dev = dev;
+	priv->cdev.f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+	priv->cdev.tstc = serial_usb_tstc;
+	priv->cdev.putc = serial_usb_putc;
+	priv->cdev.getc = serial_usb_getc;
+	priv->cdev.setbrg = NULL;
+
+	return console_register(&priv->cdev);
+}
+
+static struct driver_d serial_usb_driver = {
+	.name = "serial_usb",
+	.probe = serial_usb_probe,
+};
+
+static int serial_usb_init(void){
+	return register_driver(&serial_usb_driver);
+}
+console_initcall(serial_usb_init);
-- 
1.7.12.1


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