1/* $NetBSD: bcm2835_cprman.c,v 1.5 2021/01/27 03:10:19 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2017 Jared D. 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 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
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: bcm2835_cprman.c,v 1.5 2021/01/27 03:10:19 thorpej Exp $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/device.h>
35#include <sys/kmem.h>
36#include <sys/bus.h>
37
38#include <dev/clk/clk_backend.h>
39
40#include <dev/fdt/fdtvar.h>
41
42#include <arm/broadcom/bcm2835var.h>
43
44enum {
45	CPRMAN_CLOCK_TIMER = 17,
46	CPRMAN_CLOCK_UART = 19,
47	CPRMAN_CLOCK_VPU = 20,
48	CPRMAN_CLOCK_V3D = 21,
49	CPRMAN_CLOCK_ISP = 22,
50	CPRMAN_CLOCK_H264 = 23,
51	CPRMAN_CLOCK_VEC = 24,
52	CPRMAN_CLOCK_HSM = 25,
53	CPRMAN_CLOCK_SDRAM = 26,
54	CPRMAN_CLOCK_TSENS = 27,
55	CPRMAN_CLOCK_EMMC = 28,
56	CPRMAN_CLOCK_PERIIMAGE = 29,
57	CPRMAN_CLOCK_PWM = 30,
58	CPRMAN_CLOCK_PCM = 31,
59	CPRMAN_CLOCK_EMMC2 = 51,
60	CPRMAN_NCLOCK
61};
62
63struct cprman_clk {
64	struct clk	base;
65	u_int		id;
66};
67
68struct cprman_softc {
69	device_t	sc_dev;
70	int		sc_phandle;
71
72	struct clk_domain sc_clkdom;
73	struct cprman_clk sc_clk[CPRMAN_NCLOCK];
74};
75
76
77static struct clk *
78cprman_decode(device_t dev, int cc_phandle, const void *data, size_t len)
79{
80	struct cprman_softc * const sc = device_private(dev);
81	struct cprman_clk *clk;
82	const u_int *spec = data;
83	u_int id;
84
85	if (len != 4)
86		return NULL;
87
88	id = be32toh(spec[0]);
89
90	if (id >= CPRMAN_NCLOCK)
91		return NULL;
92	clk = &sc->sc_clk[id];
93	if (clk->base.name == NULL)
94		return NULL;
95
96	return &clk->base;
97}
98
99static const struct fdtbus_clock_controller_func cprman_fdt_funcs = {
100	.decode = cprman_decode
101};
102
103static struct clk *
104cprman_get(void *priv, const char *name)
105{
106	struct cprman_softc * const sc = priv;
107	u_int n;
108
109	for (n = 0; n < __arraycount(sc->sc_clk); n++) {
110		if (sc->sc_clk[n].base.name == NULL)
111			continue;
112		if (strcmp(sc->sc_clk[n].base.name, name) == 0)
113			return &sc->sc_clk[n].base;
114	}
115
116	return NULL;
117}
118
119static void
120cprman_put(void *priv, struct clk *clk)
121{
122}
123
124static u_int
125cprman_get_rate(void *priv, struct clk *baseclk)
126{
127	//struct cprman_softc * const sc = priv;
128	struct cprman_clk *clk = container_of(baseclk, struct cprman_clk, base);
129
130	switch (clk->id) {
131	case CPRMAN_CLOCK_UART:
132		return bcm283x_clk_get_rate_uart();
133	case CPRMAN_CLOCK_VPU:
134		return bcm283x_clk_get_rate_vpu();
135	case CPRMAN_CLOCK_EMMC:
136		return bcm283x_clk_get_rate_emmc();
137	case CPRMAN_CLOCK_EMMC2:
138		return bcm283x_clk_get_rate_emmc2();
139	default:
140		panic("unsupported clock id %d\n", clk->id);
141	}
142}
143
144static const struct clk_funcs cprman_clk_funcs = {
145	.get = cprman_get,
146	.put = cprman_put,
147	.get_rate = cprman_get_rate,
148};
149
150static void
151cprman_add_clock(struct cprman_softc *sc, u_int id, const char *name)
152{
153	sc->sc_clk[id].base.domain = &sc->sc_clkdom;
154	sc->sc_clk[id].base.name = name;
155	sc->sc_clk[id].id = id;
156}
157
158static const struct device_compatible_entry compat_data[] = {
159	{ .compat = "brcm,bcm2835-cprman" },
160	{ .compat = "brcm,bcm2711-cprman" },
161	DEVICE_COMPAT_EOL
162};
163
164static int
165cprman_match(device_t parent, cfdata_t cf, void *aux)
166{
167	const struct fdt_attach_args *faa = aux;
168
169	return of_compatible_match(faa->faa_phandle, compat_data);
170}
171
172static void
173cprman_attach(device_t parent, device_t self, void *aux)
174{
175	struct cprman_softc * const sc = device_private(self);
176	const struct fdt_attach_args *faa = aux;
177	const int phandle = faa->faa_phandle;
178
179	sc->sc_dev = self;
180	sc->sc_phandle = phandle;
181	sc->sc_clkdom.funcs = &cprman_clk_funcs;
182	sc->sc_clkdom.priv = sc;
183
184	cprman_add_clock(sc, CPRMAN_CLOCK_UART, "uart");
185	cprman_add_clock(sc, CPRMAN_CLOCK_VPU, "vpu");
186	cprman_add_clock(sc, CPRMAN_CLOCK_EMMC, "emmc");
187	cprman_add_clock(sc, CPRMAN_CLOCK_EMMC2, "emmc2");
188
189	aprint_naive("\n");
190	aprint_normal(": BCM283x Clock Controller\n");
191
192	fdtbus_register_clock_controller(self, phandle, &cprman_fdt_funcs);
193}
194
195CFATTACH_DECL_NEW(bcmcprman_fdt, sizeof(struct cprman_softc),
196    cprman_match, cprman_attach, NULL, NULL);
197