meson6_timer.c revision 1.1
1/* $NetBSD: meson6_timer.c,v 1.1 2019/08/14 15:08:53 skrll 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 1.1 2019/08/14 15:08:53 skrll 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 43static int meson6_timer_match(device_t, cfdata_t, void *); 44static void meson6_timer_attach(device_t, device_t, void *); 45 46struct 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 54CFATTACH_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 92static u_int 93meson6_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 101static int 102meson6_timer_match(device_t parent, cfdata_t cf, void *aux) 103{ 104 const char * const compatible[] = { 105 "amlogic,meson6-timer", 106 NULL 107 }; 108 struct fdt_attach_args * const faa = aux; 109 110 return of_match_compatible(faa->faa_phandle, compatible); 111} 112 113static void 114meson6_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