1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org> 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, 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__FBSDID("$FreeBSD$"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/bus.h> 35 36#include <dev/extres/clk/clk.h> 37 38#include <arm64/rockchip/clk/rk_clk_gate.h> 39 40#include "clkdev_if.h" 41 42#define WR4(_clk, off, val) \ 43 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 44#define RD4(_clk, off, val) \ 45 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 46#define MD4(_clk, off, clr, set ) \ 47 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 48#define DEVICE_LOCK(_clk) \ 49 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 50#define DEVICE_UNLOCK(_clk) \ 51 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 52 53static int rk_clk_gate_init(struct clknode *clk, device_t dev); 54static int rk_clk_gate_set_gate(struct clknode *clk, bool enable); 55struct rk_clk_gate_sc { 56 uint32_t offset; 57 uint32_t shift; 58 uint32_t mask; 59 uint32_t on_value; 60 uint32_t off_value; 61 int gate_flags; 62 bool ungated; 63}; 64 65static clknode_method_t rk_clk_gate_methods[] = { 66 /* Device interface */ 67 CLKNODEMETHOD(clknode_init, rk_clk_gate_init), 68 CLKNODEMETHOD(clknode_set_gate, rk_clk_gate_set_gate), 69 CLKNODEMETHOD_END 70}; 71DEFINE_CLASS_1(rk_clk_gate, rk_clk_gate_class, rk_clk_gate_methods, 72 sizeof(struct rk_clk_gate_sc), clknode_class); 73 74static int 75rk_clk_gate_init(struct clknode *clk, device_t dev) 76{ 77 uint32_t reg; 78 struct rk_clk_gate_sc *sc; 79 int rv; 80 81 sc = clknode_get_softc(clk); 82 DEVICE_LOCK(clk); 83 rv = RD4(clk, sc->offset, ®); 84 DEVICE_UNLOCK(clk); 85 if (rv != 0) 86 return (rv); 87 reg = (reg >> sc->shift) & sc->mask; 88 sc->ungated = reg == sc->on_value ? 1 : 0; 89 clknode_init_parent_idx(clk, 0); 90 return(0); 91} 92 93static int 94rk_clk_gate_set_gate(struct clknode *clk, bool enable) 95{ 96 uint32_t reg; 97 struct rk_clk_gate_sc *sc; 98 int rv; 99 100 sc = clknode_get_softc(clk); 101 sc->ungated = enable; 102 DEVICE_LOCK(clk); 103 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 104 ((sc->ungated ? sc->on_value : sc->off_value) << sc->shift) | 105 RK_CLK_GATE_MASK); 106 if (rv != 0) { 107 DEVICE_UNLOCK(clk); 108 return (rv); 109 } 110 RD4(clk, sc->offset, ®); 111 DEVICE_UNLOCK(clk); 112 return(0); 113} 114 115int 116rk_clk_gate_register(struct clkdom *clkdom, struct rk_clk_gate_def *clkdef) 117{ 118 struct clknode *clk; 119 struct rk_clk_gate_sc *sc; 120 121 clk = clknode_create(clkdom, &rk_clk_gate_class, &clkdef->clkdef); 122 if (clk == NULL) 123 return (1); 124 125 sc = clknode_get_softc(clk); 126 sc->offset = clkdef->offset; 127 sc->shift = clkdef->shift; 128 sc->mask = clkdef->mask; 129 sc->on_value = clkdef->on_value; 130 sc->off_value = clkdef->off_value; 131 sc->gate_flags = clkdef->gate_flags; 132 133 clknode_register(clkdom, clk); 134 return (0); 135} 136