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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2021, 2022 Soren Schmidt <sos@deepcore.dk>
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  */
28
29 #include <sys/param.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <sys/mutex.h>
34 #include <sys/rman.h>
35 #include <machine/bus.h>
36
37 #include <dev/ofw/openfirm.h>
38 #include <dev/ofw/ofw_bus.h>
39 #include <dev/ofw/ofw_bus_subr.h>
40
41 #include <dev/fdt/simple_mfd.h>
42
43 #include <dev/clk/clk.h>
44 #include <dev/hwreset/hwreset.h>
45 #include <dev/regulator/regulator.h>
46 #include <dev/syscon/syscon.h>
47 #include <dev/phy/phy.h>
48
49 #include <contrib/device-tree/include/dt-bindings/phy/phy.h>
50
51 #include "syscon_if.h"
52 #include "phydev_if.h"
53 #include "phynode_if.h"
54
55 #define GRF_PCIE30PHY_CON1              0x04
56 #define GRF_PCIE30PHY_CON4              0x10
57 #define GRF_PCIE30PHY_CON5              0x14
58 #define GRF_PCIE30PHY_CON6              0x18
59 #define  GRF_BIFURCATION_LANE_1         0
60 #define  GRF_BIFURCATION_LANE_2         1
61 #define  GRF_PCIE30PHY_WR_EN            (0xf << 16)
62 #define GRF_PCIE30PHY_CON9              0x24
63 #define  GRF_PCIE30PHY_DA_OCM_MASK      (1 << (15 + 16))
64 #define  GRF_PCIE30PHY_DA_OCM           ((1 << 15) | GRF_PCIE30PHY_DA_OCM_MASK)
65 #define GRF_PCIE30PHY_STATUS0           0x80
66 #define  SRAM_INIT_DONE                 (1 << 14)
67
68 static struct ofw_compat_data compat_data[] = {
69         {"rockchip,rk3568-pcie3-phy",   1},
70         {NULL, 0}
71 };
72
73 struct rk3568_pciephy_softc {
74         device_t        dev;
75         phandle_t       node;
76         struct resource *mem;
77         struct phynode  *phynode;
78         struct syscon   *phy_grf;
79         clk_t           refclk_m;
80         clk_t           refclk_n;
81         clk_t           pclk;
82         hwreset_t       phy_reset;
83 };
84
85
86 static void
87 rk3568_pciephy_bifurcate(device_t dev, int control, uint32_t lane)
88 {
89         struct rk3568_pciephy_softc *sc = device_get_softc(dev);
90
91         switch (lane) {
92         case 0:
93                 SYSCON_WRITE_4(sc->phy_grf, control, GRF_PCIE30PHY_WR_EN);
94                 return;
95         case 1:
96                 SYSCON_WRITE_4(sc->phy_grf, control,
97                     GRF_PCIE30PHY_WR_EN | GRF_BIFURCATION_LANE_1);
98                 break;
99         case 2:
100                 SYSCON_WRITE_4(sc->phy_grf, control,
101                     GRF_PCIE30PHY_WR_EN | GRF_BIFURCATION_LANE_2);
102                 break;
103         default:
104                 device_printf(dev, "Illegal lane %d\n", lane);
105                 return;
106         }
107         if (bootverbose)
108                 device_printf(dev, "lane %d @ pcie3x%d\n", lane,
109                     (control == GRF_PCIE30PHY_CON5) ? 1 : 2);
110 }
111
112 /* PHY class and methods */
113 static int
114 rk3568_pciephy_enable(struct phynode *phynode, bool enable)
115 {
116         device_t dev = phynode_get_device(phynode);
117         struct rk3568_pciephy_softc *sc = device_get_softc(dev);
118         int count;
119
120         if (enable) {
121                 /* Pull PHY out of reset */
122                 hwreset_deassert(sc->phy_reset);
123
124                 /* Poll for SRAM loaded and ready */
125                 for (count = 100; count; count--) {
126                         if (SYSCON_READ_4(sc->phy_grf, GRF_PCIE30PHY_STATUS0) &
127                             SRAM_INIT_DONE)
128                                 break;
129                         DELAY(10000);
130                         if (count == 0) {
131                                 device_printf(dev, "SRAM init timeout!\n");
132                                 return (ENXIO);
133                         }
134                 }
135         }
136         return (0);
137 }
138
139 static phynode_method_t rk3568_pciephy_phynode_methods[] = {
140         PHYNODEMETHOD(phynode_enable,   rk3568_pciephy_enable),
141
142         PHYNODEMETHOD_END
143 };
144 DEFINE_CLASS_1(rk3568_pciephy_phynode, rk3568_pciephy_phynode_class,
145     rk3568_pciephy_phynode_methods, 0, phynode_class);
146
147
148 /* Device class and methods */
149 static int
150 rk3568_pciephy_probe(device_t dev)
151 {
152
153         if (!ofw_bus_status_okay(dev))
154                 return (ENXIO);
155         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
156                 return (ENXIO);
157         device_set_desc(dev, "RockChip PCIe PHY");
158         return (BUS_PROBE_DEFAULT);
159 }
160
161 static int
162 rk3568_pciephy_attach(device_t dev)
163 {
164         struct rk3568_pciephy_softc *sc = device_get_softc(dev);
165         struct phynode_init_def phy_init;
166         struct phynode *phynode;
167         uint32_t data_lanes[2] = { 0, 0 };
168         int rid = 0;
169
170         sc->dev = dev;
171         sc->node = ofw_bus_get_node(dev);
172
173         /* Get memory resource */
174         if (!(sc->mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
175             RF_ACTIVE))) {
176                 device_printf(dev, "Cannot allocate memory resources\n");
177                 return (ENXIO);
178         }
179
180         /* Get syncons handle */
181         if (OF_hasprop(sc->node, "rockchip,phy-grf") &&
182             syscon_get_by_ofw_property(dev, sc->node, "rockchip,phy-grf",
183             &sc->phy_grf))
184                 return (ENXIO);
185
186         /* Get & enable clocks */
187         if (clk_get_by_ofw_name(dev, 0, "refclk_m", &sc->refclk_m)) {
188                 device_printf(dev, "getting refclk_m failed\n");
189                 return (ENXIO);
190         }
191         if (clk_enable(sc->refclk_m))
192                 device_printf(dev, "enable refclk_m failed\n");
193         if (clk_get_by_ofw_name(dev, 0, "refclk_n", &sc->refclk_n)) {
194                 device_printf(dev, "getting refclk_n failed\n");
195                 return (ENXIO);
196         }
197         if (clk_enable(sc->refclk_n))
198                 device_printf(dev, "enable refclk_n failed\n");
199         if (clk_get_by_ofw_name(dev, 0, "pclk", &sc->pclk)) {
200                 device_printf(dev, "getting pclk failed\n");
201                 return (ENXIO);
202         }
203         if (clk_enable(sc->pclk))
204                 device_printf(dev, "enable pclk failed\n");
205
206         /* Get & assert reset */
207         if (hwreset_get_by_ofw_idx(dev, sc->node, 0, &sc->phy_reset)) {
208                 device_printf(dev, "Cannot get reset\n");
209         } else
210                 hwreset_assert(sc->phy_reset);
211
212         /* Set RC/EP mode not implemented yet (RC mode only) */
213
214         /* Set bifurcation according to "data-lanes" entry */
215         if (OF_hasprop(sc->node, "data-lanes")) {
216                 OF_getencprop(sc->node, "data-lanes", data_lanes,
217                     sizeof(data_lanes));
218         } else
219                 if (bootverbose)
220                         device_printf(dev, "lane 1 & 2 @pcie3x2\n");
221
222         /* Deassert PCIe PMA output clamp mode */
223         SYSCON_WRITE_4(sc->phy_grf, GRF_PCIE30PHY_CON9, GRF_PCIE30PHY_DA_OCM);
224
225         /* Configure PHY HW accordingly */
226         rk3568_pciephy_bifurcate(dev, GRF_PCIE30PHY_CON5, data_lanes[0]);
227         rk3568_pciephy_bifurcate(dev, GRF_PCIE30PHY_CON6, data_lanes[1]);
228
229         if (data_lanes[0] || data_lanes[1])
230                 SYSCON_WRITE_4(sc->phy_grf, GRF_PCIE30PHY_CON1,
231                     GRF_PCIE30PHY_DA_OCM);
232         else
233                 SYSCON_WRITE_4(sc->phy_grf, GRF_PCIE30PHY_CON1,
234                     GRF_PCIE30PHY_DA_OCM_MASK);
235
236         bzero(&phy_init, sizeof(phy_init));
237         phy_init.id = PHY_NONE;
238         phy_init.ofw_node = sc->node;
239         if (!(phynode = phynode_create(dev, &rk3568_pciephy_phynode_class,
240             &phy_init))) {
241                 device_printf(dev, "failed to create pciephy PHY\n");
242                 return (ENXIO);
243         }
244         if (!phynode_register(phynode)) {
245                 device_printf(dev, "failed to register pciephy PHY\n");
246                 return (ENXIO);
247         }
248         sc->phynode = phynode;
249
250         return (0);
251 }
252
253 static device_method_t rk3568_pciephy_methods[] = {
254         DEVMETHOD(device_probe,         rk3568_pciephy_probe),
255         DEVMETHOD(device_attach,        rk3568_pciephy_attach),
256
257         DEVMETHOD_END
258 };
259
260 DEFINE_CLASS_1(rk3568_pciephy, rk3568_pciephy_driver, rk3568_pciephy_methods,
261     sizeof(struct simple_mfd_softc), simple_mfd_driver);
262 EARLY_DRIVER_MODULE(rk3568_pciephy, simplebus, rk3568_pciephy_driver,
263     0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_LATE);