pinctrl_single.c revision 1.3 
1/* $NetBSD: pinctrl_single.c,v 1.3 2021/01/25 14:25:09 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2019 Jared 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: pinctrl_single.c,v 1.3 2021/01/25 14:25:09 thorpej Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/systm.h>
36#include <sys/gpio.h>
37
38#include <dev/fdt/fdtvar.h>
39
40#define	PINCTRL_FLAG_PINCONF	__BIT(0)	/* supports generic pinconf */
41
42struct pinctrl_single_config {
43	uint32_t	flags;
44};
45
46static const struct pinctrl_single_config pinctrl_config = {
47};
48
49static const struct pinctrl_single_config pinconf_config = {
50	.flags = PINCTRL_FLAG_PINCONF
51};
52
53static const struct device_compatible_entry compat_data[] = {
54	{ .compat = "pinctrl-single",	.data = &pinctrl_config },
55	{ .compat = "pinconf-single",	.data = &pinconf_config },
56	{ }
57};
58
59struct pinctrl_single_softc {
60	device_t			sc_dev;
61	int				sc_phandle;
62	bus_space_tag_t			sc_bst;
63	bus_space_handle_t		sc_bsh;
64	uint32_t			sc_flags;
65	u_int				sc_regwidth;
66	u_int				sc_funcmask;
67};
68
69static void
70pinctrl_single_pins_write(struct pinctrl_single_softc *sc, u_int off, u_int val)
71{
72	union {
73		uint32_t reg32;
74		uint16_t reg16;
75		uint8_t reg8;
76	} u;
77
78	aprint_debug_dev(sc->sc_dev, "writing %#x with %#x\n", off, val);
79
80	switch (sc->sc_regwidth) {
81	case 8:
82		u.reg8 = bus_space_read_1(sc->sc_bst, sc->sc_bsh, off);
83		u.reg8 &= ~sc->sc_funcmask;
84		u.reg8 |= val;
85		bus_space_write_1(sc->sc_bst, sc->sc_bsh, off, u.reg8);
86		break;
87	case 16:
88		u.reg16 = bus_space_read_2(sc->sc_bst, sc->sc_bsh, off);
89		u.reg16 &= ~sc->sc_funcmask;
90		u.reg16 |= val;
91		bus_space_write_2(sc->sc_bst, sc->sc_bsh, off, u.reg16);
92		break;
93	case 32:
94		u.reg32 = bus_space_read_4(sc->sc_bst, sc->sc_bsh, off);
95		u.reg32 &= ~sc->sc_funcmask;
96		u.reg32 |= val;
97		bus_space_write_4(sc->sc_bst, sc->sc_bsh, off, u.reg32);
98		break;
99	default:
100		device_printf(sc->sc_dev, "%s: unsupported reg width %d\n",
101		    __func__, sc->sc_regwidth);
102		break;
103	}
104}
105
106static int
107pinctrl_single_pins_set_config(device_t dev, const void *data, size_t len)
108{
109	struct pinctrl_single_softc * const sc = device_private(dev);
110	const u_int *pins;
111	int pinslen;
112
113	if (len != 4)
114		return -1;
115
116	const int phandle = fdtbus_get_phandle_from_native(be32dec(data));
117
118	pins = fdtbus_get_prop(phandle, "pinctrl-single,pins", &pinslen);
119	if (pins == NULL)
120		return -1;
121
122	while (pinslen >= 8) {
123		const int off = be32toh(pins[0]);
124		const int val = be32toh(pins[1]);
125
126		pinctrl_single_pins_write(sc, off, val);
127		pins += 2;
128		pinslen -= 8;
129	}
130
131	return 0;
132}
133
134static struct fdtbus_pinctrl_controller_func pinctrl_single_pins_funcs = {
135	.set_config = pinctrl_single_pins_set_config,
136};
137
138static int
139pinctrl_single_match(device_t parent, cfdata_t cf, void *aux)
140{
141	struct fdt_attach_args * const faa = aux;
142
143	return of_match_compat_data(faa->faa_phandle, compat_data);
144}
145
146static void
147pinctrl_single_attach(device_t parent, device_t self, void *aux)
148{
149	struct pinctrl_single_softc * const sc = device_private(self);
150	struct fdt_attach_args * const faa = aux;
151	const int phandle = faa->faa_phandle;
152	const struct pinctrl_single_config *conf;
153	bus_addr_t addr;
154	bus_size_t size;
155	int child;
156
157	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
158		aprint_error(": couldn't get registers\n");
159		return;
160	}
161
162	conf = of_search_compatible(phandle, compat_data)->data;
163
164	sc->sc_dev = self;
165	sc->sc_phandle = phandle;
166	sc->sc_bst = faa->faa_bst;
167	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
168		aprint_error(": couldn't map registers\n");
169		return;
170	}
171	sc->sc_flags = conf->flags;
172
173	if (of_getprop_uint32(phandle, "pinctrl-single,register-width", &sc->sc_regwidth) != 0) {
174		aprint_error(": missing 'pinctrl-single,register-width' property\n");
175		return;
176	}
177	if (of_getprop_uint32(phandle, "pinctrl-single,function-mask", &sc->sc_funcmask) != 0) {
178		aprint_error(": missing 'pinctrl-single,function-mask' property\n");
179		return;
180	}
181
182	switch (sc->sc_regwidth) {
183	case 8:
184	case 16:
185	case 32:
186		break;
187	default:
188		aprint_error(": register width %d not supported\n", sc->sc_regwidth);
189		return;
190	}
191
192	aprint_naive("\n");
193	aprint_normal("\n");
194
195	for (child = OF_child(phandle); child; child = OF_peer(child)) {
196		if (of_hasprop(child, "pinctrl-single,pins"))
197			fdtbus_register_pinctrl_config(self, child, &pinctrl_single_pins_funcs);
198	}
199
200	fdtbus_pinctrl_set_config(phandle, "default");
201}
202
203CFATTACH_DECL_NEW(pinctrl_single, sizeof(struct pinctrl_single_softc),
204	pinctrl_single_match, pinctrl_single_attach, NULL, NULL);
205