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/freescale/imx/clk/imx_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 53 static int imx_clk_gate_init(struct clknode *clk, device_t dev); 54 static int imx_clk_gate_set_gate(struct clknode *clk, bool enable); 55 struct imx_clk_gate_sc { 56 uint32_t offset; 57 uint32_t shift; 58 uint32_t mask; 59 int gate_flags; 60 }; 61 62 static clknode_method_t imx_clk_gate_methods[] = { 63 /* Device interface */ 64 CLKNODEMETHOD(clknode_init, imx_clk_gate_init), 65 CLKNODEMETHOD(clknode_set_gate, imx_clk_gate_set_gate), 66 CLKNODEMETHOD_END 67 }; 68 DEFINE_CLASS_1(imx_clk_gate, imx_clk_gate_class, imx_clk_gate_methods, 69 sizeof(struct imx_clk_gate_sc), clknode_class); 70 71 static int 72 imx_clk_gate_init(struct clknode *clk, device_t dev) 73 { 74 75 clknode_init_parent_idx(clk, 0); 76 return(0); 77 } 78 79 static int 80 imx_clk_gate_set_gate(struct clknode *clk, bool enable) 81 { 82 uint32_t reg; 83 struct imx_clk_gate_sc *sc; 84 int rv; 85 86 sc = clknode_get_softc(clk); 87 DEVICE_LOCK(clk); 88 rv = MD4(clk, sc->offset, sc->mask << sc->shift, 89 (enable ? sc->mask : 0) << sc->shift); 90 if (rv != 0) { 91 DEVICE_UNLOCK(clk); 92 return (rv); 93 } 94 RD4(clk, sc->offset, ®); 95 DEVICE_UNLOCK(clk); 96 return(0); 97 } 98 99 int 100 imx_clk_gate_register(struct clkdom *clkdom, struct imx_clk_gate_def *clkdef) 101 { 102 struct clknode *clk; 103 struct imx_clk_gate_sc *sc; 104 105 clk = clknode_create(clkdom, &imx_clk_gate_class, &clkdef->clkdef); 106 if (clk == NULL) 107 return (1); 108 109 sc = clknode_get_softc(clk); 110 sc->offset = clkdef->offset; 111 sc->shift = clkdef->shift; 112 sc->mask = clkdef->mask; 113 sc->gate_flags = clkdef->gate_flags; 114 115 clknode_register(clkdom, clk); 116 return (0); 117 } 118