Add an EHCI driver to libpayload's USB stack.

Interrupt transfer support is missing (ie. no keyboard),
bulk and control transfers work (ie. mass storage).

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Peter Stuge <peter@stuge.se>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5845 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/drivers/usb/ehci_rh.c

@@ -0,0 +1,145 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2010 coresystems GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include "ehci.h"
+#include "ehci_private.h"
+
+typedef struct {
+	int n_ports;
+	/* typical C, n_ports is the number
+	 * of ports, while ports[] spans [0,n_ports-1],
+	 * even though the spec counts from 1.
+	 */
+	volatile portsc_t *ports;
+	int *devices;
+} rh_inst_t;
+
+#define RH_INST(dev) ((rh_inst_t*)(dev)->data)
+
+static void
+ehci_rh_destroy (usbdev_t *dev)
+{
+        free (RH_INST(dev)->devices);
+        free (RH_INST(dev));
+}
+
+static void
+ehci_rh_hand_over_port (usbdev_t *dev, int port)
+{
+	volatile portsc_t *p = &(RH_INST(dev)->ports[port]);
+
+	printf("giving up port %x, it's USB1\n", port+1);
+
+	/* Lowspeed device. Hand over to companion */
+	p->port_owner = 1;
+	do {} while (!p->conn_status_change);
+	/* RW/C register, so clear it by writing 1 */
+	p->conn_status_change = 1;
+	return;
+}
+
+static void
+ehci_rh_scanport (usbdev_t *dev, int port)
+{
+	volatile portsc_t *p = &(RH_INST(dev)->ports[port]);
+	if (RH_INST(dev)->devices[port]!=-1) {
+		printf("Unregister device at port %x\n", port+1);
+		usb_detach_device(dev->controller, RH_INST(dev)->devices[port]);
+		RH_INST(dev)->devices[port]=-1;
+	}
+	/* device connected, handle */
+	if (p->current_conn_status) {
+		mdelay(100);
+		if (p->line_status == 0x1) {
+			ehci_rh_hand_over_port(dev, port);
+			return;
+		}
+		p->port_enable = 0;
+		p->port_reset = 1;
+		mdelay(50);
+		p->port_reset = 0;
+		/* Wait for flag change to finish. The controller might take a while */
+		while (p->port_reset) ;
+		if (!p->port_enable) {
+			ehci_rh_hand_over_port(dev, port);
+			return;
+		}
+		printf("port %x hosts a USB2 device\n", port+1);
+		RH_INST(dev)->devices[port] = usb_attach_device(dev->controller, dev->address, port, 2);
+	}
+	/* RW/C register, so clear it by writing 1 */
+	p->conn_status_change = 1;
+}
+
+static int
+ehci_rh_report_port_changes (usbdev_t *dev)
+{
+	int i;
+	for (i=0; i<RH_INST(dev)->n_ports; i++) {
+		if (RH_INST(dev)->ports[i].conn_status_change)
+			return i;
+	}
+	return -1;
+}
+
+static void
+ehci_rh_poll (usbdev_t *dev)
+{
+	int port;
+	while ((port = ehci_rh_report_port_changes (dev)) != -1)
+		ehci_rh_scanport (dev, port);
+}
+
+
+void
+ehci_rh_init (usbdev_t *dev)
+{
+	int i;
+
+	dev->destroy = ehci_rh_destroy;
+	dev->poll = ehci_rh_poll;
+
+	dev->data = malloc(sizeof(rh_inst_t));
+
+	RH_INST(dev)->n_ports = EHCI_INST(dev->controller)->capabilities->n_ports;
+	RH_INST(dev)->ports = EHCI_INST(dev->controller)->operation->portsc;
+
+	printf("root hub has %x ports\n", RH_INST(dev)->n_ports);
+
+	RH_INST(dev)->devices = malloc(RH_INST(dev)->n_ports * sizeof(int));
+	for (i=0; i < RH_INST(dev)->n_ports; i++) {
+		RH_INST(dev)->devices[i] = -1;
+		RH_INST(dev)->ports[i].pp = 1;
+	}
+
+	dev->address = 0;
+	dev->hub = -1;
+	dev->port = -1;
+}