usbdebug: Move initialisation of the optional hub

Add new file for device-specific initialisation transactions.

Change-Id: I339df400a41675f178c7af613f03b2b44c826189
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7208
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins)

1 files changed, 138 insertions, 0 deletions

diff --git a/src/drivers/usb/gadget.c b/src/drivers/usb/gadget.c
new file mode 100644
index 0000000000..d3b496375d
--- /dev/null
+++ b/src/drivers/usb/gadget.c
@@ -0,0 +1,138 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#include <stddef.h>
+#include <console/console.h>
+
+#include "ehci_debug.h"
+#include "usb_ch9.h"
+#include "ehci.h"
+
+
+#define USB_HUB_PORT_CONNECTION		0
+#define USB_HUB_PORT_ENABLED		1
+#define USB_HUB_PORT_RESET		4
+#define USB_HUB_PORT_POWER		8
+#define USB_HUB_C_PORT_CONNECTION	16
+#define USB_HUB_C_PORT_RESET		20
+
+
+static int hub_port_status(const char * buf, int feature)
+{
+	return !!(buf[feature>>3] & (1<<(feature&0x7)));
+}
+
+/* After USB port reset, treat device number 0 as an USB hub. Assign it with
+ * a device number hub_addr. Then apply enable and reset on downstream port.
+ */
+ static int dbgp_hub_enable(struct ehci_dbg_port *ehci_debug, unsigned char hub_addr,
+	unsigned char port)
+{
+	char status[8];
+	int ret, loop;
+
+	/* Assign a devicenumber for the hub. */
+	ret = dbgp_control_msg(ehci_debug, 0,
+		USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+		USB_REQ_SET_ADDRESS, hub_addr, 0, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	/* Enter configured state on hub. */
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+		USB_REQ_SET_CONFIGURATION, 1, 0, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	/* Set PORT_POWER, poll for PORT_CONNECTION. */
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_SET_FEATURE, USB_HUB_PORT_POWER, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	loop = 100;
+	do {
+		dbgp_mdelay(10);
+		ret = dbgp_control_msg(ehci_debug, hub_addr,
+			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_OTHER,
+			USB_REQ_GET_STATUS, 0, port, status, 4);
+		if (ret < 0)
+			goto err;
+		if (hub_port_status(status, USB_HUB_PORT_CONNECTION))
+			break;
+	} while (--loop);
+	if (! loop)
+		goto err;
+
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_CLEAR_FEATURE, USB_HUB_C_PORT_CONNECTION, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+
+	/* Set PORT_RESET, poll for C_PORT_RESET. */
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_SET_FEATURE, USB_HUB_PORT_RESET, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	loop = 100;
+	do {
+		dbgp_mdelay(10);
+		ret = dbgp_control_msg(ehci_debug, hub_addr,
+			USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_OTHER,
+			USB_REQ_GET_STATUS, 0, port, status, 4);
+		if (ret < 0)
+			goto err;
+		if (hub_port_status(status, USB_HUB_C_PORT_RESET))
+			break;
+	} while (--loop);
+	if (! loop)
+		goto err;
+
+	ret = dbgp_control_msg(ehci_debug, hub_addr,
+		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER,
+		USB_REQ_CLEAR_FEATURE, USB_HUB_C_PORT_RESET, port, NULL, 0);
+	if (ret < 0)
+		goto err;
+
+	if (hub_port_status(status, USB_HUB_PORT_ENABLED))
+		return 0;
+err:
+	return -1;
+}
+
+
+int dbgp_probe_gadget(struct ehci_dbg_port *ehci_debug, struct dbgp_pipe *pipe)
+{
+	int ret;
+
+	if (CONFIG_USBDEBUG_OPTIONAL_HUB_PORT != 0) {
+		ret = dbgp_hub_enable(ehci_debug, USB_DEBUG_DEVNUM-1,
+			CONFIG_USBDEBUG_OPTIONAL_HUB_PORT);
+		if (ret < 0) {
+			printk(BIOS_INFO, "Could not enable USB hub on debug port.\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}