1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 33 #include <dev/extres/clk/clk.h> 34 35 #include <arm64/freescale/imx/clk/imx_clk_gate.h> 36 37 #include "clkdev_if.h" 38 39 #define WR4(_clk, off, val) \ 40 CLKDEV_WRITE_4(clknode_get_device(_clk), off, val) 41 #define RD4(_clk, off, val) \ 42 CLKDEV_READ_4(clknode_get_device(_clk), off, val) 43 #define MD4(_clk, off, clr, set ) \ 44 CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set) 45 #define DEVICE_LOCK(_clk) \ 46 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 47 #define DEVICE_UNLOCK(_clk) \ 48 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 49 50 static int imx_clk_gate_init(struct clknode *clk, device_t dev); 51 static int imx_clk_gate_set_gate(struct clknode *clk, bool enable); 52 struct imx_clk_gate_sc { 53 uint32_t offset; 54 uint32_t shift; 55 uint32_t mask; 56 int gate_flags; 57 }; 58 59 static clknode_method_t imx_clk_gate_methods[] = { 60 /* Device interface */ 61 CLKNODEMETHOD(clknode_init, imx_clk_gate_init), 62 CLKNODEMETHOD(clknode_set_gate, imx_clk_gate_set_gate), 63 CLKNODEMETHOD_END 64 }; 65 DEFINE_CLASS_1(imx_clk_gate, imx_clk_gate_class, imx_clk_gate_methods, 66 sizeof(struct imx_clk_gate_sc), clknode_class); 67 68 static int 69 imx_clk_gate_init(struct clknode *clk, device_t dev) 70 { 71 72 clknode_init_parent_idx(clk, 0); 73 return(0); 74 } 75 76 static int 77 imx_clk_gate_set_gate(struct clknode *clk, bool enable) 78 { 79 uint32_t reg; 80 struct imx_clk_gate_sc *sc; 81 int rv; 82 83 sc = clknode_get_softc(clk); 84 DEVICE_LOCK(clk); 85 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 86 (enable ? sc->mask : 0) << sc->shift); 87 if (rv != 0) { 88 DEVICE_UNLOCK(clk); 89 return (rv); 90 } 91 RD4(clk, sc->offset, ®); 92 DEVICE_UNLOCK(clk); 93 return(0); 94 } 95 96 int 97 imx_clk_gate_register(struct clkdom *clkdom, struct imx_clk_gate_def *clkdef) 98 { 99 struct clknode *clk; 100 struct imx_clk_gate_sc *sc; 101 102 clk = clknode_create(clkdom, &imx_clk_gate_class, &clkdef->clkdef); 103 if (clk == NULL) 104 return (1); 105 106 sc = clknode_get_softc(clk); 107 sc->offset = clkdef->offset; 108 sc->shift = clkdef->shift; 109 sc->mask = clkdef->mask; 110 sc->gate_flags = clkdef->gate_flags; 111 112 clknode_register(clkdom, clk); 113 return (0); 114 } 115