2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2018 Emmanuel Vadot <manu@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
38 #include <dev/extres/clk/clk.h>
40 #include <arm64/rockchip/clk/rk_clk_composite.h>
42 #include "clkdev_if.h"
44 struct rk_clk_composite_sc {
45 uint32_t muxdiv_offset;
60 #define WRITE4(_clk, off, val) \
61 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
62 #define READ4(_clk, off, val) \
63 CLKDEV_READ_4(clknode_get_device(_clk), off, val)
64 #define DEVICE_LOCK(_clk) \
65 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
66 #define DEVICE_UNLOCK(_clk) \
67 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
69 #define RK_CLK_COMPOSITE_MASK_SHIFT 16
71 /* #define dprintf(format, arg...) printf("%s:(%s)" format, __func__, clknode_get_name(clk), arg) */
72 #define dprintf(format, arg...)
75 rk_clk_composite_init(struct clknode *clk, device_t dev)
77 struct rk_clk_composite_sc *sc;
80 sc = clknode_get_softc(clk);
83 if ((sc->flags & RK_CLK_COMPOSITE_HAVE_MUX) != 0) {
85 READ4(clk, sc->muxdiv_offset, &val);
88 idx = (val & sc->mux_mask) >> sc->mux_shift;
91 clknode_init_parent_idx(clk, idx);
97 rk_clk_composite_set_gate(struct clknode *clk, bool enable)
99 struct rk_clk_composite_sc *sc;
102 sc = clknode_get_softc(clk);
104 if ((sc->flags & RK_CLK_COMPOSITE_HAVE_GATE) == 0)
107 dprintf("%sabling gate\n", enable ? "En" : "Dis");
109 val |= 1 << sc->gate_shift;
110 dprintf("sc->gate_shift: %x\n", sc->gate_shift);
111 val |= (1 << sc->gate_shift) << RK_CLK_COMPOSITE_MASK_SHIFT;
112 dprintf("Write: gate_offset=%x, val=%x\n", sc->gate_offset, val);
114 WRITE4(clk, sc->gate_offset, val);
121 rk_clk_composite_set_mux(struct clknode *clk, int index)
123 struct rk_clk_composite_sc *sc;
126 sc = clknode_get_softc(clk);
128 if ((sc->flags & RK_CLK_COMPOSITE_HAVE_MUX) == 0)
131 dprintf("Set mux to %d\n", index);
133 val |= (index << sc->mux_shift);
134 val |= sc->mux_mask << RK_CLK_COMPOSITE_MASK_SHIFT;
135 dprintf("Write: muxdiv_offset=%x, val=%x\n", sc->muxdiv_offset, val);
136 WRITE4(clk, sc->muxdiv_offset, val);
143 rk_clk_composite_recalc(struct clknode *clk, uint64_t *freq)
145 struct rk_clk_composite_sc *sc;
148 sc = clknode_get_softc(clk);
152 READ4(clk, sc->muxdiv_offset, ®);
153 dprintf("Read: muxdiv_offset=%x, val=%x\n", sc->muxdiv_offset, reg);
157 div = ((reg & sc->div_mask) >> sc->div_shift) + 1;
158 dprintf("parent_freq=%lu, div=%u\n", *freq, div);
165 rk_clk_composite_find_best(struct rk_clk_composite_sc *sc, uint64_t fparent,
169 uint32_t best_div, div;
171 for (best = 0, best_div = 0, div = 0;
172 div <= ((sc->div_mask >> sc->div_shift) + 1); div++) {
174 if ((freq - cur) < (freq - best)) {
185 rk_clk_composite_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
186 int flags, int *stop)
188 struct rk_clk_composite_sc *sc;
189 struct clknode *p_clk;
190 const char **p_names;
192 uint32_t div, best_div, val = 0;
193 int p_idx, best_parent;
195 sc = clknode_get_softc(clk);
197 dprintf("Finding best parent/div for target freq of %lu\n", *fout);
198 p_names = clknode_get_parent_names(clk);
199 for (best_div = 0, best = 0, p_idx = 0;
200 p_idx != clknode_get_parents_num(clk); p_idx++) {
201 p_clk = clknode_find_by_name(p_names[p_idx]);
202 clknode_get_freq(p_clk, &fparent);
203 dprintf("Testing with parent %s (%d) at freq %lu\n", clknode_get_name(p_clk), p_idx, fparent);
204 div = rk_clk_composite_find_best(sc, fparent, *fout);
206 if ((*fout - cur) < (*fout - best)) {
210 dprintf("Best parent so far %s (%d) with best freq at %lu\n", clknode_get_name(p_clk), p_idx, best);
217 if ((best < *fout) &&
218 ((flags & CLK_SET_ROUND_DOWN) == 0)) {
222 if ((best > *fout) &&
223 ((flags & CLK_SET_ROUND_UP) == 0)) {
228 if ((flags & CLK_SET_DRYRUN) != 0) {
234 p_idx = clknode_get_parent_idx(clk);
235 if (p_idx != best_parent) {
236 dprintf("Switching parent index from %d to %d\n", p_idx, best_parent);
237 clknode_set_parent_by_idx(clk, best_parent);
240 dprintf("Setting divider to %d\n", best_div);
242 val |= (best_div - 1) << sc->div_shift;
243 val |= (sc->div_mask << sc->div_shift) << RK_CLK_COMPOSITE_MASK_SHIFT;
244 dprintf("Write: muxdiv_offset=%x, val=%x\n", sc->muxdiv_offset, val);
245 WRITE4(clk, sc->muxdiv_offset, val);
254 static clknode_method_t rk_clk_composite_clknode_methods[] = {
255 /* Device interface */
256 CLKNODEMETHOD(clknode_init, rk_clk_composite_init),
257 CLKNODEMETHOD(clknode_set_gate, rk_clk_composite_set_gate),
258 CLKNODEMETHOD(clknode_set_mux, rk_clk_composite_set_mux),
259 CLKNODEMETHOD(clknode_recalc_freq, rk_clk_composite_recalc),
260 CLKNODEMETHOD(clknode_set_freq, rk_clk_composite_set_freq),
264 DEFINE_CLASS_1(rk_clk_composite_clknode, rk_clk_composite_clknode_class,
265 rk_clk_composite_clknode_methods, sizeof(struct rk_clk_composite_sc),
269 rk_clk_composite_register(struct clkdom *clkdom, struct rk_clk_composite_def *clkdef)
272 struct rk_clk_composite_sc *sc;
274 clk = clknode_create(clkdom, &rk_clk_composite_clknode_class,
279 sc = clknode_get_softc(clk);
281 sc->muxdiv_offset = clkdef->muxdiv_offset;
283 sc->mux_shift = clkdef->mux_shift;
284 sc->mux_width = clkdef->mux_width;
285 sc->mux_mask = ((1 << clkdef->mux_width) - 1) << sc->mux_shift;
287 sc->div_shift = clkdef->div_shift;
288 sc->div_width = clkdef->div_width;
289 sc->div_mask = ((1 << clkdef->div_width) - 1) << sc->div_shift;
291 sc->gate_offset = clkdef->gate_offset;
292 sc->gate_shift = clkdef->gate_shift;
294 sc->flags = clkdef->flags;
296 clknode_register(clkdom, clk);