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one-true-awk: import 20210221 (1e4bc42c53a1) which fixes a number of bugs
[FreeBSD/FreeBSD.git] / sys / arm / ti / clk / ti_gate_clock.c
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
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 ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23  * 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  * $FreeBSD$
28  */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/conf.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/systm.h>
39 #include <sys/libkern.h>
40
41 #include <machine/bus.h>
42 #include <dev/fdt/simplebus.h>
43
44 #include <dev/extres/clk/clk_gate.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47
48 #include "clock_common.h"
49
50 #define DEBUG_GATE      0
51
52 #if DEBUG_GATE
53 #define DPRINTF(dev, msg...) device_printf(dev, msg)
54 #else
55 #define DPRINTF(dev, msg...)
56 #endif
57
58 /*
59  * Devicetree description
60  * Documentation/devicetree/bindings/clock/ti/gate.txt
61  */
62
63 struct ti_gate_softc {
64         device_t                sc_dev;
65         bool                    attach_done;
66         uint8_t                 sc_type;
67
68         struct clk_gate_def     gate_def;
69         struct clock_cell_info  clock_cell;
70         struct clkdom           *clkdom;
71 };
72
73 static int ti_gate_probe(device_t dev);
74 static int ti_gate_attach(device_t dev);
75 static int ti_gate_detach(device_t dev);
76
77 #define TI_GATE_CLOCK                   7
78 #define TI_WAIT_GATE_CLOCK              6
79 #define TI_DSS_GATE_CLOCK               5
80 #define TI_AM35XX_GATE_CLOCK            4
81 #define TI_CLKDM_GATE_CLOCK             3
82 #define TI_HSDIV_GATE_CLOCK             2
83 #define TI_COMPOSITE_NO_WAIT_GATE_CLOCK 1
84 #define TI_GATE_END                     0
85
86 static struct ofw_compat_data compat_data[] = {
87         { "ti,gate-clock",                      TI_GATE_CLOCK },
88         { "ti,wait-gate-clock",                 TI_WAIT_GATE_CLOCK },
89         { "ti,dss-gate-clock",                  TI_DSS_GATE_CLOCK },
90         { "ti,am35xx-gate-clock",               TI_AM35XX_GATE_CLOCK },
91         { "ti,clkdm-gate-clock",                TI_CLKDM_GATE_CLOCK },
92         { "ti,hsdiv-gate-cloc",                 TI_HSDIV_GATE_CLOCK },
93         { "ti,composite-no-wait-gate-clock",    TI_COMPOSITE_NO_WAIT_GATE_CLOCK },
94         { NULL,                                 TI_GATE_END }
95 };
96
97 static int
98 ti_gate_probe(device_t dev)
99 {
100         if (!ofw_bus_status_okay(dev))
101                 return (ENXIO);
102
103         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
104                 return (ENXIO);
105
106         device_set_desc(dev, "TI Gate Clock");
107
108         return (BUS_PROBE_DEFAULT);
109 }
110
111 static int
112 register_clk(struct ti_gate_softc *sc) {
113         int err;
114         sc->clkdom = clkdom_create(sc->sc_dev);
115         if (sc->clkdom == NULL) {
116                 DPRINTF(sc->sc_dev, "Failed to create clkdom\n");
117                 return ENXIO;
118         }
119
120         err = clknode_gate_register(sc->clkdom, &sc->gate_def);
121         if (err) {
122                 DPRINTF(sc->sc_dev, "clknode_gate_register failed %x\n", err);
123                 return ENXIO;
124         }
125
126         err = clkdom_finit(sc->clkdom);
127         if (err) {
128                 DPRINTF(sc->sc_dev, "Clk domain finit fails %x.\n", err);
129                 return ENXIO;
130         }
131
132         return (0);
133 }
134
135 static int
136 ti_gate_attach(device_t dev)
137 {
138         struct ti_gate_softc *sc;
139         phandle_t node;
140         int err;
141         cell_t value;
142
143         sc = device_get_softc(dev);
144         sc->sc_dev = dev;
145         node = ofw_bus_get_node(dev);
146
147         /* Get the compatible type */
148         sc->sc_type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
149
150         /* Get the content of reg properties */
151         if (sc->sc_type != TI_CLKDM_GATE_CLOCK) {
152                 OF_getencprop(node, "reg", &value, sizeof(value));
153                 sc->gate_def.offset = value;
154         }
155 #if DEBUG_GATE
156         else {
157                 DPRINTF(sc->sc_dev, "no reg (TI_CLKDM_GATE_CLOCK)\n");
158         }
159 #endif
160
161         if (OF_hasprop(node, "ti,bit-shift")) {
162                 OF_getencprop(node, "ti,bit-shift", &value, sizeof(value));
163                 sc->gate_def.shift = value;
164                 DPRINTF(sc->sc_dev, "ti,bit-shift => shift %x\n", sc->gate_def.shift);
165         }
166         if (OF_hasprop(node, "ti,set-bit-to-disable")) {
167                 sc->gate_def.on_value = 0;
168                 sc->gate_def.off_value = 1;
169                 DPRINTF(sc->sc_dev,
170                         "on_value = 0, off_value = 1 (ti,set-bit-to-disable)\n");
171         } else {
172                 sc->gate_def.on_value = 1;
173                 sc->gate_def.off_value = 0;
174                 DPRINTF(sc->sc_dev, "on_value = 1, off_value = 0\n");
175         }
176
177         sc->gate_def.gate_flags = 0x0;
178
179         read_clock_cells(sc->sc_dev, &sc->clock_cell);
180
181         create_clkdef(sc->sc_dev, &sc->clock_cell, &sc->gate_def.clkdef);
182
183         /* Calculate mask */
184         sc->gate_def.mask = (1 << fls(sc->clock_cell.num_real_clocks)) - 1;
185         DPRINTF(sc->sc_dev, "num_real_clocks %x gate_def.mask %x\n",
186                 sc->clock_cell.num_real_clocks, sc->gate_def.mask);
187
188         err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->gate_def.clkdef);
189
190         if (err) {
191                 /* free_clkdef will be called in ti_gate_new_pass */
192                 DPRINTF(sc->sc_dev, "find_parent_clock_names failed\n");
193                 return (bus_generic_attach(sc->sc_dev));
194         }
195
196         err = register_clk(sc);
197
198         if (err) {
199                 /* free_clkdef will be called in ti_gate_new_pass */
200                 DPRINTF(sc->sc_dev, "register_clk failed\n");
201                 return (bus_generic_attach(sc->sc_dev));
202         }
203
204         sc->attach_done = true;
205
206         free_clkdef(&sc->gate_def.clkdef);
207
208         return (bus_generic_attach(sc->sc_dev));
209 }
210
211 static int
212 ti_gate_detach(device_t dev)
213 {
214         return (EBUSY);
215 }
216
217 static void
218 ti_gate_new_pass(device_t dev) {
219         struct ti_gate_softc *sc;
220         int err;
221
222         sc = device_get_softc(dev);
223
224         if (sc->attach_done) {
225                 return;
226         }
227
228         err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->gate_def.clkdef);
229         if (err) {
230                 /* free_clkdef will be called in later call to ti_gate_new_pass */
231                 DPRINTF(sc->sc_dev, "new_pass find_parent_clock_names failed\n");
232                 return;
233         }
234
235         err = register_clk(sc);
236         if (err) {
237                 /* free_clkdef will be called in later call to ti_gate_new_pass */
238                 DPRINTF(sc->sc_dev, "new_pass register_clk failed\n");
239                 return;
240         }
241
242         sc->attach_done = true;
243
244         free_clkdef(&sc->gate_def.clkdef);
245 }
246
247 static device_method_t ti_gate_methods[] = {
248         /* Device interface */
249         DEVMETHOD(device_probe,         ti_gate_probe),
250         DEVMETHOD(device_attach,        ti_gate_attach),
251         DEVMETHOD(device_detach,        ti_gate_detach),
252
253         /* Bus interface */
254         DEVMETHOD(bus_new_pass,         ti_gate_new_pass),
255
256         DEVMETHOD_END
257 };
258
259 DEFINE_CLASS_0(ti_gate, ti_gate_driver, ti_gate_methods,
260         sizeof(struct ti_gate_softc));
261
262 static devclass_t ti_gate_devclass;
263
264 EARLY_DRIVER_MODULE(ti_gate, simplebus, ti_gate_driver,
265         ti_gate_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
266 MODULE_VERSION(ti_gate, 1);