2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2019 Emmanuel Vadot <manu@freebsd.org>
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
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.
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
37 #include <dev/extres/clk/clk.h>
39 #include <arm/allwinner/clkng/aw_clk.h>
40 #include <arm/allwinner/clkng/aw_clk_np.h>
42 #include "clkdev_if.h"
45 * clknode for clocks matching the formula :
54 struct aw_clk_factor n;
55 struct aw_clk_factor p;
59 uint32_t lock_retries;
64 #define WRITE4(_clk, off, val) \
65 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
66 #define READ4(_clk, off, val) \
67 CLKDEV_READ_4(clknode_get_device(_clk), off, val)
68 #define DEVICE_LOCK(_clk) \
69 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
70 #define DEVICE_UNLOCK(_clk) \
71 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
74 aw_clk_np_init(struct clknode *clk, device_t dev)
77 clknode_init_parent_idx(clk, 0);
82 aw_clk_np_set_gate(struct clknode *clk, bool enable)
84 struct aw_clk_np_sc *sc;
87 sc = clknode_get_softc(clk);
89 if ((sc->flags & AW_CLK_HAS_GATE) == 0)
93 READ4(clk, sc->offset, &val);
95 val |= (1 << sc->gate_shift);
97 val &= ~(1 << sc->gate_shift);
98 WRITE4(clk, sc->offset, val);
105 aw_clk_np_find_best(struct aw_clk_np_sc *sc, uint64_t fparent, uint64_t *fout,
106 uint32_t *factor_n, uint32_t *factor_p)
109 uint32_t n, p, max_n, max_p, min_n, min_p;
111 *factor_n = *factor_p = 0;
113 max_n = aw_clk_factor_get_max(&sc->n);
114 max_p = aw_clk_factor_get_max(&sc->p);
115 min_n = aw_clk_factor_get_min(&sc->n);
116 min_p = aw_clk_factor_get_min(&sc->p);
118 for (p = min_p; p <= max_p; ) {
119 for (n = min_n; n <= max_n; ) {
120 cur = fparent * n / p;
121 if (abs(*fout - cur) < abs(*fout - best)) {
136 aw_clk_np_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
137 int flags, int *stop)
139 struct aw_clk_np_sc *sc;
141 uint32_t val, n, p, best_n, best_p;
144 sc = clknode_get_softc(clk);
148 best = aw_clk_np_find_best(sc, fparent, fout,
151 if ((flags & CLK_SET_DRYRUN) != 0) {
157 if ((best < *fout) &&
158 ((flags & CLK_SET_ROUND_DOWN) == 0)) {
162 if ((best > *fout) &&
163 ((flags & CLK_SET_ROUND_UP) == 0)) {
169 READ4(clk, sc->offset, &val);
171 n = aw_clk_factor_get_value(&sc->n, best_n);
172 p = aw_clk_factor_get_value(&sc->p, best_p);
175 val |= n << sc->n.shift;
176 val |= p << sc->p.shift;
178 WRITE4(clk, sc->offset, val);
181 if ((sc->flags & AW_CLK_HAS_LOCK) != 0) {
182 for (retry = 0; retry < sc->lock_retries; retry++) {
183 READ4(clk, sc->offset, &val);
184 if ((val & (1 << sc->lock_shift)) != 0)
197 aw_clk_np_recalc(struct clknode *clk, uint64_t *freq)
199 struct aw_clk_np_sc *sc;
202 sc = clknode_get_softc(clk);
205 READ4(clk, sc->offset, &val);
208 n = aw_clk_get_factor(val, &sc->n);
209 p = aw_clk_get_factor(val, &sc->p);
211 *freq = *freq * n / p;
216 static clknode_method_t aw_np_clknode_methods[] = {
217 /* Device interface */
218 CLKNODEMETHOD(clknode_init, aw_clk_np_init),
219 CLKNODEMETHOD(clknode_set_gate, aw_clk_np_set_gate),
220 CLKNODEMETHOD(clknode_recalc_freq, aw_clk_np_recalc),
221 CLKNODEMETHOD(clknode_set_freq, aw_clk_np_set_freq),
225 DEFINE_CLASS_1(aw_np_clknode, aw_np_clknode_class, aw_np_clknode_methods,
226 sizeof(struct aw_clk_np_sc), clknode_class);
229 aw_clk_np_register(struct clkdom *clkdom, struct aw_clk_np_def *clkdef)
232 struct aw_clk_np_sc *sc;
234 clk = clknode_create(clkdom, &aw_np_clknode_class, &clkdef->clkdef);
238 sc = clknode_get_softc(clk);
240 sc->offset = clkdef->offset;
242 sc->n.shift = clkdef->n.shift;
243 sc->n.width = clkdef->n.width;
244 sc->n.mask = ((1 << sc->n.width) - 1) << sc->n.shift;
245 sc->n.value = clkdef->n.value;
246 sc->n.flags = clkdef->n.flags;
248 sc->p.shift = clkdef->p.shift;
249 sc->p.width = clkdef->p.width;
250 sc->p.mask = ((1 << sc->p.width) - 1) << sc->p.shift;
251 sc->p.value = clkdef->p.value;
252 sc->p.flags = clkdef->p.flags;
254 sc->gate_shift = clkdef->gate_shift;
256 sc->lock_shift = clkdef->lock_shift;
257 sc->lock_retries = clkdef->lock_retries;
259 sc->flags = clkdef->flags;
261 clknode_register(clkdom, clk);