1 /* $NetBSD: sunxi_usb3phy.c,v 1.1 2018/05/01 23:59:42 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /*
30 * Allwinner USB3PHY
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bus.h>
38 #include <sys/rman.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/gpio.h>
42 #include <machine/bus.h>
43
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46
47 #include <dev/extres/clk/clk.h>
48 #include <dev/extres/hwreset/hwreset.h>
49 #include <dev/extres/regulator/regulator.h>
50 #include <dev/extres/phy/phy_usb.h>
51
52 #include "phynode_if.h"
53
54 #define USB3PHY_APP 0x00
55 #define APP_FORCE_VBUS (0x3 << 12)
56
57 #define USB3PHY_PIPE_CLOCK_CONTROL 0x14
58 #define PCC_PIPE_CLK_OPEN (1 << 6)
59
60 #define USB3PHY_PHY_TUNE_LOW 0x18
61 #define PTL_MAGIC 0x0047fc87
62
63 #define USB3PHY_PHY_TUNE_HIGH 0x1c
64 #define PTH_TX_DEEMPH_3P5DB (0x1F << 19)
65 #define PTH_TX_DEEMPH_6DB (0x3F << 13)
66 #define PTH_TX_SWING_FULL (0x7F << 6)
67 #define PTH_LOS_BIAS (0x7 << 3)
68 #define PTH_TX_BOOST_LVL (0x7 << 0)
69
70 #define USB3PHY_PHY_EXTERNAL_CONTROL 0x20
71 #define PEC_REF_SSP_EN (1 << 26)
72 #define PEC_SSC_EN (1 << 24)
73 #define PEC_EXTERN_VBUS (0x3 << 1)
74
75 #define __LOWEST_SET_BIT(__mask) ((((__mask) - 1) & (__mask)) ^ (__mask))
76 #define __SHIFTIN(__x, __mask) ((__x) * __LOWEST_SET_BIT(__mask))
77
78 static struct ofw_compat_data compat_data[] = {
79 { "allwinner,sun50i-h6-usb3-phy", 1 },
80 { NULL, 0 }
81 };
82
83 static struct resource_spec aw_usb3phy_spec[] = {
84 { SYS_RES_MEMORY, 0, RF_ACTIVE },
85 { -1, 0 }
86 };
87
88 struct awusb3phy_softc {
89 struct resource * res;
90 regulator_t reg;
91 int mode;
92 };
93
94 /* Phy class and methods. */
95 static int awusb3phy_phy_enable(struct phynode *phy, bool enable);
96 static int awusb3phy_get_mode(struct phynode *phy, int *mode);
97 static int awusb3phy_set_mode(struct phynode *phy, int mode);
98 static phynode_usb_method_t awusb3phy_phynode_methods[] = {
99 PHYNODEMETHOD(phynode_enable, awusb3phy_phy_enable),
100 PHYNODEMETHOD(phynode_usb_get_mode, awusb3phy_get_mode),
101 PHYNODEMETHOD(phynode_usb_set_mode, awusb3phy_set_mode),
102
103 PHYNODEMETHOD_END
104 };
105 DEFINE_CLASS_1(awusb3phy_phynode, awusb3phy_phynode_class, awusb3phy_phynode_methods,
106 sizeof(struct phynode_usb_sc), phynode_usb_class);
107
108 #define RD4(res, o) bus_read_4(res, (o))
109 #define WR4(res, o, v) bus_write_4(res, (o), (v))
110
111 static int
112 awusb3phy_phy_enable(struct phynode *phynode, bool enable)
113 {
114 struct awusb3phy_softc *sc;
115 device_t dev;
116 uint32_t val;
117 int error = 0;
118
119 dev = phynode_get_device(phynode);
120 sc = device_get_softc(dev);
121
122 device_printf(dev, "%s: called\n", __func__);
123
124 if (enable) {
125 val = RD4(sc->res, USB3PHY_PHY_EXTERNAL_CONTROL);
126 device_printf(dev, "EXTERNAL_CONTROL: %x\n", val);
127 val |= PEC_EXTERN_VBUS;
128 val |= PEC_SSC_EN;
129 val |= PEC_REF_SSP_EN;
130 device_printf(dev, "EXTERNAL_CONTROL: %x\n", val);
131 WR4(sc->res, USB3PHY_PHY_EXTERNAL_CONTROL, val);
132
133 val = RD4(sc->res, USB3PHY_PIPE_CLOCK_CONTROL);
134 device_printf(dev, "PIPE_CONTROL: %x\n", val);
135 val |= PCC_PIPE_CLK_OPEN;
136 device_printf(dev, "PIPE_CONTROL: %x\n", val);
137 WR4(sc->res, USB3PHY_PIPE_CLOCK_CONTROL, val);
138
139 val = RD4(sc->res, USB3PHY_APP);
140 device_printf(dev, "APP: %x\n", val);
141 val |= APP_FORCE_VBUS;
142 device_printf(dev, "APP: %x\n", val);
143 WR4(sc->res, USB3PHY_APP, val);
144
145 WR4(sc->res, USB3PHY_PHY_TUNE_LOW, PTL_MAGIC);
146
147 val = RD4(sc->res, USB3PHY_PHY_TUNE_HIGH);
148 device_printf(dev, "PHY_TUNE_HIGH: %x\n", val);
149 val |= PTH_TX_BOOST_LVL;
150 val |= PTH_LOS_BIAS;
151 val &= ~PTH_TX_SWING_FULL;
152 val |= __SHIFTIN(0x55, PTH_TX_SWING_FULL);
153 val &= ~PTH_TX_DEEMPH_6DB;
154 val |= __SHIFTIN(0x20, PTH_TX_DEEMPH_6DB);
155 val &= ~PTH_TX_DEEMPH_3P5DB;
156 val |= __SHIFTIN(0x15, PTH_TX_DEEMPH_3P5DB);
157 device_printf(dev, "PHY_TUNE_HIGH: %x\n", val);
158 WR4(sc->res, USB3PHY_PHY_TUNE_HIGH, val);
159
160 if (sc->reg)
161 error = regulator_enable(sc->reg);
162 } else {
163 if (sc->reg)
164 error = regulator_disable(sc->reg);
165 }
166
167 if (error != 0) {
168 device_printf(dev,
169 "couldn't %s regulator for phy\n",
170 enable ? "enable" : "disable");
171 return (error);
172 }
173
174 return (0);
175 }
176
177 static int
178 awusb3phy_get_mode(struct phynode *phynode, int *mode)
179 {
180 struct awusb3phy_softc *sc;
181 device_t dev;
182
183 dev = phynode_get_device(phynode);
184 sc = device_get_softc(dev);
185
186 *mode = sc->mode;
187
188 return (0);
189 }
190
191 static int
192 awusb3phy_set_mode(struct phynode *phynode, int mode)
193 {
194 device_t dev;
195 intptr_t phy;
196 struct awusb3phy_softc *sc;
197
198 dev = phynode_get_device(phynode);
199 phy = phynode_get_id(phynode);
200 sc = device_get_softc(dev);
201
202 if (mode != PHY_USB_MODE_HOST)
203 return (EINVAL);
204
205 sc->mode = mode;
206
207 return (0);
208 }
209
210 static int
211 awusb3phy_probe(device_t dev)
212 {
213 if (!ofw_bus_status_okay(dev))
214 return (ENXIO);
215
216 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
217 return (ENXIO);
218
219 device_set_desc(dev, "Allwinner USB3PHY");
220 return (BUS_PROBE_DEFAULT);
221 }
222
223 static int
224 awusb3phy_attach(device_t dev)
225 {
226 struct phynode *phynode;
227 struct phynode_init_def phy_init;
228 struct awusb3phy_softc *sc;
229 clk_t clk;
230 hwreset_t rst;
231 phandle_t node;
232 int error, i;
233
234 sc = device_get_softc(dev);
235 node = ofw_bus_get_node(dev);
236
237 if (bus_alloc_resources(dev, aw_usb3phy_spec, &sc->res) != 0) {
238 device_printf(dev, "cannot allocate resources for device\n");
239 return (ENXIO);
240 }
241
242 /* Enable clocks */
243 for (i = 0; clk_get_by_ofw_index(dev, 0, i, &clk) == 0; i++) {
244 error = clk_enable(clk);
245 if (error != 0) {
246 device_printf(dev, "couldn't enable clock %s\n",
247 clk_get_name(clk));
248 return (error);
249 }
250 }
251
252 /* De-assert resets */
253 for (i = 0; hwreset_get_by_ofw_idx(dev, 0, i, &rst) == 0; i++) {
254 error = hwreset_deassert(rst);
255 if (error != 0) {
256 device_printf(dev, "couldn't de-assert reset %d\n",
257 i);
258 return (error);
259 }
260 }
261
262 /* Get regulators */
263 regulator_get_by_ofw_property(dev, node, "phy-supply", &sc->reg);
264
265 /* Create the phy */
266 phy_init.ofw_node = ofw_bus_get_node(dev);
267 phynode = phynode_create(dev, &awusb3phy_phynode_class,
268 &phy_init);
269 if (phynode == NULL) {
270 device_printf(dev, "failed to create USB PHY\n");
271 return (ENXIO);
272 }
273 if (phynode_register(phynode) == NULL) {
274 device_printf(dev, "failed to create USB PHY\n");
275 return (ENXIO);
276 }
277
278 return (error);
279 }
280
281 static device_method_t awusb3phy_methods[] = {
282 /* Device interface */
283 DEVMETHOD(device_probe, awusb3phy_probe),
284 DEVMETHOD(device_attach, awusb3phy_attach),
285
286 DEVMETHOD_END
287 };
288
289 static driver_t awusb3phy_driver = {
290 "awusb3phy",
291 awusb3phy_methods,
292 sizeof(struct awusb3phy_softc)
293 };
294
295 static devclass_t awusb3phy_devclass;
296 /* aw_usb3phy needs to come up after regulators/gpio/etc, but before ehci/ohci */
297 EARLY_DRIVER_MODULE(awusb3phy, simplebus, awusb3phy_driver, awusb3phy_devclass,
298 0, 0, BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);
299 MODULE_VERSION(awusb3phy, 1);
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