2 * This file is part of the libpayload project.
4 * Copyright (C) 2008-2010 coresystems GmbH
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
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15 * derived from this software without specific prior written permission.
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32 #include <libpayload.h>
34 #include "uhci_private.h"
40 #define RH_INST(dev) ((rh_inst_t*)(dev)->data)
43 uhci_rh_enable_port (usbdev_t *dev, int port)
46 hci_t *controller = dev->controller;
52 debug("Invalid port %d\n", port);
56 uhci_reg_write16(controller, port,
57 uhci_reg_read16(controller, port) & ~(1 << 12)); /* wakeup */
59 uhci_reg_write16(controller, port,
60 uhci_reg_read16(controller, port) | 1 << 9); /* reset */
62 uhci_reg_write16(controller, port,
63 uhci_reg_read16(controller, port) & ~(1 << 9));
64 mdelay (1); // >5.3us per spec, <3ms because some devices make trouble
66 uhci_reg_write16(controller, port,
67 uhci_reg_read16(controller, port) | 1 << 2); /* enable */
69 value = uhci_reg_read16 (controller, port);
71 } while (((value & (1 << 2)) == 0) && (value & 0x01));
74 /* disable root hub */
76 uhci_rh_disable_port (usbdev_t *dev, int port)
78 hci_t *controller = dev->controller;
82 uhci_reg_write16(controller, port,
83 uhci_reg_read16(controller, port) & ~4);
86 value = uhci_reg_read16 (controller, port);
88 } while ((value & (1 << 2)) != 0);
92 uhci_rh_scanport (usbdev_t *dev, int port)
98 } else if (port == 2) {
102 debug("Invalid port %d\n", port);
105 int devno = RH_INST (dev)->port[offset];
106 if ((dev->controller->devices[devno] != 0) && (devno != -1)) {
107 usb_detach_device(dev->controller, devno);
108 RH_INST (dev)->port[offset] = -1;
110 uhci_reg_write16(dev->controller, portsc,
111 uhci_reg_read16(dev->controller, portsc) | (1 << 3) | (1 << 2)); // clear port state change, enable port
113 mdelay(100); // wait for signal to stabilize
115 if ((uhci_reg_read16 (dev->controller, portsc) & 1) != 0) {
118 uhci_rh_disable_port (dev, port);
119 uhci_rh_enable_port (dev, port);
121 int speed = ((uhci_reg_read16 (dev->controller, portsc) >> 8) & 1);
123 RH_INST (dev)->port[offset] = usb_attach_device(dev->controller, dev->address, portsc, speed);
128 uhci_rh_report_port_changes (usbdev_t *dev)
132 stored = (RH_INST (dev)->port[0] == -1);
133 real = ((uhci_reg_read16 (dev->controller, PORTSC1) & 1) == 0);
134 if (stored != real) {
135 debug("change on port 1\n");
139 stored = (RH_INST (dev)->port[1] == -1);
140 real = ((uhci_reg_read16 (dev->controller, PORTSC2) & 1) == 0);
141 if (stored != real) {
142 debug("change on port 2\n");
146 // maybe detach+attach happened between two scans?
148 if ((uhci_reg_read16 (dev->controller, PORTSC1) & 2) > 0) {
149 debug("possibly re-attached on port 1\n");
152 if ((uhci_reg_read16 (dev->controller, PORTSC2) & 2) > 0) {
153 debug("possibly re-attached on port 2\n");
162 uhci_rh_destroy (usbdev_t *dev)
164 uhci_rh_disable_port (dev, 1);
165 uhci_rh_disable_port (dev, 2);
166 free (RH_INST (dev));
170 uhci_rh_poll (usbdev_t *dev)
173 while ((port = uhci_rh_report_port_changes (dev)) != -1)
174 uhci_rh_scanport (dev, port);
178 uhci_rh_init (usbdev_t *dev)
180 dev->destroy = uhci_rh_destroy;
181 dev->poll = uhci_rh_poll;
183 uhci_rh_enable_port (dev, 1);
184 uhci_rh_enable_port (dev, 2);
185 dev->data = malloc (sizeof (rh_inst_t));
187 fatal("Not enough memory for UHCI RH.\n");
189 RH_INST (dev)->port[0] = -1;
190 RH_INST (dev)->port[1] = -1;
192 /* we can set them here because a root hub _really_ shouldn't