1 /*-
2 * Copyright (c) 2016 Michal Meloun <mmel@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 /*
31 * EHCI driver for Tegra SoCs.
32 */
33 #include "opt_bus.h"
34 #include "opt_platform.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/bus.h>
41 #include <sys/condvar.h>
42 #include <sys/rman.h>
43
44 #include <machine/bus.h>
45 #include <machine/resource.h>
46
47 #include <dev/extres/clk/clk.h>
48 #include <dev/extres/hwreset/hwreset.h>
49 #include <dev/extres/phy/phy.h>
50 #include <dev/ofw/ofw_bus.h>
51 #include <dev/ofw/ofw_bus_subr.h>
52 #include <dev/usb/usb.h>
53 #include <dev/usb/usbdi.h>
54 #include <dev/usb/usb_busdma.h>
55 #include <dev/usb/usb_process.h>
56 #include <dev/usb/usb_controller.h>
57 #include <dev/usb/usb_bus.h>
58 #include <dev/usb/controller/ehci.h>
59 #include <dev/usb/controller/ehcireg.h>
60
61 #include "usbdevs.h"
62
63 #define TEGRA_EHCI_REG_OFF 0x100
64 #define TEGRA_EHCI_REG_SIZE 0x100
65
66 /* Compatible devices. */
67 #define TEGRA124_EHCI 1
68 #define TEGRA210_EHCI 2
69 static struct ofw_compat_data compat_data[] = {
70 {"nvidia,tegra124-ehci", (uintptr_t)TEGRA124_EHCI},
71 {"nvidia,tegra210-ehci", (uintptr_t)TEGRA210_EHCI},
72 {NULL, 0},
73 };
74
75 struct tegra_ehci_softc {
76 ehci_softc_t ehci_softc;
77 device_t dev;
78 struct resource *ehci_mem_res; /* EHCI core regs. */
79 struct resource *ehci_irq_res; /* EHCI core IRQ. */
80 int usb_alloc_called;
81 clk_t clk;
82 phy_t phy;
83 hwreset_t reset;
84 };
85
86 static void
87 tegra_ehci_post_reset(struct ehci_softc *ehci_softc)
88 {
89 uint32_t usbmode;
90
91 /* Force HOST mode. */
92 usbmode = EOREAD4(ehci_softc, EHCI_USBMODE_LPM);
93 usbmode &= ~EHCI_UM_CM;
94 usbmode |= EHCI_UM_CM_HOST;
95 device_printf(ehci_softc->sc_bus.bdev, "set host controller mode\n");
96 EOWRITE4(ehci_softc, EHCI_USBMODE_LPM, usbmode);
97 }
98
99 static int
100 tegra_ehci_probe(device_t dev)
101 {
102
103 if (!ofw_bus_status_okay(dev))
104 return (ENXIO);
105
106 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
107 device_set_desc(dev, "Nvidia Tegra EHCI controller");
108 return (BUS_PROBE_DEFAULT);
109 }
110 return (ENXIO);
111 }
112
113 static int
114 tegra_ehci_detach(device_t dev)
115 {
116 struct tegra_ehci_softc *sc;
117 ehci_softc_t *esc;
118
119 sc = device_get_softc(dev);
120
121 esc = &sc->ehci_softc;
122 if (sc->clk != NULL)
123 clk_release(sc->clk);
124 if (esc->sc_bus.bdev != NULL)
125 device_delete_child(dev, esc->sc_bus.bdev);
126 if (esc->sc_flags & EHCI_SCFLG_DONEINIT)
127 ehci_detach(esc);
128 if (esc->sc_intr_hdl != NULL)
129 bus_teardown_intr(dev, esc->sc_irq_res,
130 esc->sc_intr_hdl);
131 if (sc->ehci_irq_res != NULL)
132 bus_release_resource(dev, SYS_RES_IRQ, 0,
133 sc->ehci_irq_res);
134 if (sc->ehci_mem_res != NULL)
135 bus_release_resource(dev, SYS_RES_MEMORY, 0,
136 sc->ehci_mem_res);
137 if (sc->usb_alloc_called)
138 usb_bus_mem_free_all(&esc->sc_bus, &ehci_iterate_hw_softc);
139
140 /* During module unload there are lots of children leftover. */
141 device_delete_children(dev);
142
143 return (0);
144 }
145
146 static int
147 tegra_ehci_attach(device_t dev)
148 {
149 struct tegra_ehci_softc *sc;
150 ehci_softc_t *esc;
151 int rv, rid;
152 uint64_t freq;
153
154 sc = device_get_softc(dev);
155 sc->dev = dev;
156 esc = &sc->ehci_softc;
157
158 /* Allocate resources. */
159 rid = 0;
160 sc->ehci_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
161 RF_ACTIVE | RF_SHAREABLE);
162 if (sc->ehci_mem_res == NULL) {
163 device_printf(dev, "Cannot allocate memory resources\n");
164 rv = ENXIO;
165 goto out;
166 }
167
168 rid = 0;
169 sc->ehci_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
170 RF_ACTIVE);
171 if (sc->ehci_irq_res == NULL) {
172 device_printf(dev, "Cannot allocate IRQ resources\n");
173 rv = ENXIO;
174 goto out;
175 }
176
177 rv = hwreset_get_by_ofw_name(dev, 0, "usb", &sc->reset);
178 if (rv != 0) {
179 device_printf(dev, "Cannot get reset\n");
180 rv = ENXIO;
181 goto out;
182 }
183
184 rv = phy_get_by_ofw_property(sc->dev, 0, "nvidia,phy", &sc->phy);
185 if (rv != 0) {
186 device_printf(sc->dev, "Cannot get 'nvidia,phy' phy\n");
187 rv = ENXIO;
188 goto out;
189 }
190
191 rv = clk_get_by_ofw_index(sc->dev, 0, 0, &sc->clk);
192 if (rv != 0) {
193 device_printf(dev, "Cannot get clock\n");
194 goto out;
195 }
196
197 rv = clk_enable(sc->clk);
198 if (rv != 0) {
199 device_printf(dev, "Cannot enable clock\n");
200 goto out;
201 }
202
203 freq = 0;
204 rv = clk_get_freq(sc->clk, &freq);
205 if (rv != 0) {
206 device_printf(dev, "Cannot get clock frequency\n");
207 goto out;
208 }
209
210 rv = hwreset_deassert(sc->reset);
211 if (rv != 0) {
212 device_printf(dev, "Cannot clear reset: %d\n", rv);
213 rv = ENXIO;
214 goto out;
215 }
216
217 rv = phy_enable(sc->phy);
218 if (rv != 0) {
219 device_printf(dev, "Cannot enable phy: %d\n", rv);
220 goto out;
221 }
222
223 /* Fill data for EHCI driver. */
224 esc->sc_vendor_get_port_speed = ehci_get_port_speed_hostc;
225 esc->sc_vendor_post_reset = tegra_ehci_post_reset;
226 esc->sc_io_tag = rman_get_bustag(sc->ehci_mem_res);
227 esc->sc_bus.parent = dev;
228 esc->sc_bus.devices = esc->sc_devices;
229 esc->sc_bus.devices_max = EHCI_MAX_DEVICES;
230 esc->sc_bus.dma_bits = 32;
231
232 /* Allocate all DMA memory. */
233 rv = usb_bus_mem_alloc_all(&esc->sc_bus, USB_GET_DMA_TAG(dev),
234 &ehci_iterate_hw_softc);
235 sc->usb_alloc_called = 1;
236 if (rv != 0) {
237 device_printf(dev, "usb_bus_mem_alloc_all() failed\n");
238 rv = ENOMEM;
239 goto out;
240 }
241
242 /*
243 * Set handle to USB related registers subregion used by
244 * generic EHCI driver.
245 */
246 rv = bus_space_subregion(esc->sc_io_tag,
247 rman_get_bushandle(sc->ehci_mem_res),
248 TEGRA_EHCI_REG_OFF, TEGRA_EHCI_REG_SIZE, &esc->sc_io_hdl);
249 if (rv != 0) {
250 device_printf(dev, "Could not create USB memory subregion\n");
251 rv = ENXIO;
252 goto out;
253 }
254
255 /* Setup interrupt handler. */
256 rv = bus_setup_intr(dev, sc->ehci_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
257 NULL, (driver_intr_t *)ehci_interrupt, esc, &esc->sc_intr_hdl);
258 if (rv != 0) {
259 device_printf(dev, "Could not setup IRQ\n");
260 goto out;
261 }
262
263 /* Add USB bus device. */
264 esc->sc_bus.bdev = device_add_child(dev, "usbus", -1);
265 if (esc->sc_bus.bdev == NULL) {
266 device_printf(dev, "Could not add USB device\n");
267 goto out;
268 }
269 device_set_ivars(esc->sc_bus.bdev, &esc->sc_bus);
270
271 esc->sc_id_vendor = USB_VENDOR_FREESCALE;
272 strlcpy(esc->sc_vendor, "Nvidia", sizeof(esc->sc_vendor));
273
274 /* Set flags that affect ehci_init() behavior. */
275 esc->sc_flags |= EHCI_SCFLG_TT;
276 esc->sc_flags |= EHCI_SCFLG_NORESTERM;
277 rv = ehci_init(esc);
278 if (rv != 0) {
279 device_printf(dev, "USB init failed: %d\n",
280 rv);
281 goto out;
282 }
283 esc->sc_flags |= EHCI_SCFLG_DONEINIT;
284
285 /* Probe the bus. */
286 rv = device_probe_and_attach(esc->sc_bus.bdev);
287 if (rv != 0) {
288 device_printf(dev,
289 "device_probe_and_attach() failed\n");
290 goto out;
291 }
292 return (0);
293
294 out:
295 tegra_ehci_detach(dev);
296 return (rv);
297 }
298
299 static device_method_t ehci_methods[] = {
300 /* Device interface */
301 DEVMETHOD(device_probe, tegra_ehci_probe),
302 DEVMETHOD(device_attach, tegra_ehci_attach),
303 DEVMETHOD(device_detach, tegra_ehci_detach),
304 DEVMETHOD(device_suspend, bus_generic_suspend),
305 DEVMETHOD(device_resume, bus_generic_resume),
306 DEVMETHOD(device_shutdown, bus_generic_shutdown),
307
308 /* Bus interface */
309 DEVMETHOD(bus_print_child, bus_generic_print_child),
310
311 DEVMETHOD_END
312 };
313
314 static DEFINE_CLASS_0(ehci, ehci_driver, ehci_methods,
315 sizeof(struct tegra_ehci_softc));
316 DRIVER_MODULE(tegra_ehci, simplebus, ehci_driver, NULL, NULL);
317 MODULE_DEPEND(tegra_ehci, usb, 1, 1, 1);
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