1 /* $NetBSD: meson6_timer.c,v 1.2 2021/01/27 03:10:18 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2019 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nick Hudson
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: meson6_timer.c,v 1.2 2021/01/27 03:10:18 thorpej Exp $");
34
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/device.h>
38 #include <sys/systm.h>
39 #include <sys/timetc.h>
40
41 #include <dev/fdt/fdtvar.h>
42
43 static int meson6_timer_match(device_t, cfdata_t, void *);
44 static void meson6_timer_attach(device_t, device_t, void *);
45
46 struct meson6_timer_softc {
47 device_t sc_dev;
48 bus_space_tag_t sc_bst;
49 bus_space_handle_t sc_bsh;
50
51 struct timecounter sc_tc;
52 };
53
54 CFATTACH_DECL_NEW(meson6_timer, sizeof(struct meson6_timer_softc),
55 meson6_timer_match, meson6_timer_attach, NULL, NULL);
56
57 #define TIMER_READ(sc, reg) \
58 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
59 #define TIMER_WRITE(sc, reg, val) \
60 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
61
62 #define MESON_TIMER_MUX 0x00
63 #define MESON_TIMER_MUX_TIMERD_EN __BIT(19)
64 #define MESON_TIMER_MUX_TIMERC_EN __BIT(18)
65 #define MESON_TIMER_MUX_TIMERB_EN __BIT(17)
66 #define MESON_TIMER_MUX_TIMERA_EN __BIT(16)
67 #define MESON_TIMER_MUX_TIMERD_MODE __BIT(15)
68 #define MESON_TIMER_MUX_TIMERC_MODE __BIT(14)
69 #define MESON_TIMER_MUX_TIMERB_MODE __BIT(13)
70 #define MESON_TIMER_MUX_TIMERA_MODE __BIT(12)
71 #define MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK __BITS(10, 8)
72 #define MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_SYSTEM_CLOCK 0x0
73 #define MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_1US 0x1
74 #define MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_10US 0x2
75 #define MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_100US 0x3
76 #define MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_1MS 0x4
77 #define MESON_TIMER_MUX_TIMERD_INPUT_CLOCK_MASK __BITS(7, 6)
78 #define MESON_TIMER_MUX_TIMERC_INPUT_CLOCK_MASK __BITS(5, 4)
79 #define MESON_TIMER_MUX_TIMERB_INPUT_CLOCK_MASK __BITS(3, 2)
80 #define MESON_TIMER_MUX_TIMERA_INPUT_CLOCK_MASK __BITS(1, 0)
81 #define MESON_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1US 0x0
82 #define MESON_TIMER_MUX_TIMERABCD_INPUT_CLOCK_10US 0x1
83 #define MESON_TIMER_MUX_TIMERABCD_INPUT_CLOCK_100US 0x2
84 #define MESON_TIMER_MUX_TIMERABCD_INPUT_CLOCK_1MS 0x3
85
86 #define MESON_TIMERA 0x04
87 #define MESON_TIMERB 0x08
88 #define MESON_TIMERC 0x0c
89 #define MESON_TIMERD 0x10
90 #define MESON_TIMERE 0x14
91
92 static u_int
meson6_timer_get_timecount(struct timecounter * tc)93 meson6_timer_get_timecount(struct timecounter *tc)
94 {
95 struct meson6_timer_softc * const sc = tc->tc_priv;
96
97 return TIMER_READ(sc, MESON_TIMERE);
98 }
99
100 static const struct device_compatible_entry compat_data[] = {
101 { .compat = "amlogic,meson6-timer" },
102 DEVICE_COMPAT_EOL
103 };
104
105 static int
meson6_timer_match(device_t parent,cfdata_t cf,void * aux)106 meson6_timer_match(device_t parent, cfdata_t cf, void *aux)
107 {
108 struct fdt_attach_args * const faa = aux;
109
110 return of_compatible_match(faa->faa_phandle, compat_data);
111 }
112
113 static void
meson6_timer_attach(device_t parent,device_t self,void * aux)114 meson6_timer_attach(device_t parent, device_t self, void *aux)
115 {
116 struct meson6_timer_softc * const sc = device_private(self);
117 struct fdt_attach_args * const faa = aux;
118 const int phandle = faa->faa_phandle;
119 bus_addr_t addr;
120 bus_size_t size;
121
122 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
123 aprint_error(": couldn't get registers\n");
124 return;
125 }
126
127 sc->sc_dev = self;
128 sc->sc_bst = faa->faa_bst;
129 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
130 aprint_error(": couldn't map registers\n");
131 return;
132 }
133
134 /* Enable clocks */
135 struct clk *clk;
136 for (int i = 0; (clk = fdtbus_clock_get_index(phandle, i)); i++) {
137 if (clk_enable(clk) != 0) {
138 aprint_error(": failed to enable clock #%d\n", i);
139 return;
140 }
141 }
142
143 aprint_naive("\n");
144 aprint_normal(": Timers\n");
145
146 uint32_t mask = TIMER_READ(sc, MESON_TIMER_MUX);
147 mask &= ~MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK;
148 mask |= __SHIFTIN(MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_1US, MESON_TIMER_MUX_TIMERE_INPUT_CLOCK_MASK);
149
150 TIMER_WRITE(sc, MESON_TIMER_MUX, mask);
151
152 /* Timecounter setup */
153 struct timecounter *tc = &sc->sc_tc;
154 tc->tc_get_timecount = meson6_timer_get_timecount;
155 tc->tc_counter_mask = ~0u;
156 tc->tc_frequency = 1000000;
157 tc->tc_name = "Timer E";
158 tc->tc_quality = 500;
159 tc->tc_priv = sc;
160 tc_init(tc);
161 }
162
163