1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2022 Semihalf. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bus.h> 33 34 #include <machine/bus.h> 35 36 #include <dev/extres/clk/clk.h> 37 38 #include <arm/mv/clk/armada38x_gen.h> 39 40 #include "clkdev_if.h" 41 42 #define SAR_A38X_TCLK_FREQ_SHIFT 15 43 #define SAR_A38X_TCLK_FREQ_MASK 0x00008000 44 45 #define TCLK_250MHZ 250 * 1000 * 1000 46 #define TCLK_200MHZ 200 * 1000 * 1000 47 48 #define WR4(_clk, offset, val) \ 49 CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val) 50 #define RD4(_clk, offset, val) \ 51 CLKDEV_READ_4(clknode_get_device(_clk), offset, val) 52 #define DEVICE_LOCK(_clk) \ 53 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk)) 54 #define DEVICE_UNLOCK(_clk) \ 55 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk)) 56 57 static int 58 armada38x_gen_recalc(struct clknode *clk, uint64_t *freq) 59 { 60 uint32_t reg; 61 62 DEVICE_LOCK(clk); 63 RD4(clk, 0, ®); 64 DEVICE_UNLOCK(clk); 65 66 reg = (reg & SAR_A38X_TCLK_FREQ_MASK) >> SAR_A38X_TCLK_FREQ_SHIFT; 67 *freq = reg ? TCLK_200MHZ : TCLK_250MHZ; 68 69 return (0); 70 } 71 72 static int 73 armada38x_gen_init(struct clknode *clk, device_t dev) 74 { 75 return (0); 76 } 77 78 static clknode_method_t armada38x_gen_clknode_methods[] = { 79 /* Device interface */ 80 CLKNODEMETHOD(clknode_init, armada38x_gen_init), 81 CLKNODEMETHOD(clknode_recalc_freq, armada38x_gen_recalc), 82 CLKNODEMETHOD_END 83 }; 84 85 DEFINE_CLASS_1(armada38x_gen_clknode, armada38x_gen_clknode_class, 86 armada38x_gen_clknode_methods, 0, clknode_class); 87 88 int 89 armada38x_gen_register(struct clkdom *clkdom, const struct armada38x_gen_clknode_def *clkdef) 90 { 91 struct clknode *clk; 92 93 clk = clknode_create(clkdom, &armada38x_gen_clknode_class, &clkdef->def); 94 if (clk == NULL) 95 return (1); 96 97 clknode_register(clkdom, clk); 98 99 return(0); 100 } 101