1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2021 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 AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 #include <sys/mutex.h> 34 #include <sys/rman.h> 35 #include <machine/bus.h> 36 37 #include <dev/fdt/simplebus.h> 38 39 #include <dev/extres/clk/clk.h> 40 #include <dev/extres/clk/clk_div.h> 41 #include <dev/extres/clk/clk_fixed.h> 42 #include <dev/extres/clk/clk_gate.h> 43 #include <dev/extres/clk/clk_mux.h> 44 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 48 #include "clkdev_if.h" 49 #include "periph.h" 50 51 #define PARENT_CNT 2 52 53 /* 54 * Register clock with fixed frequency divider clock. Chain consists of: 55 * fixed clock (output from xtal/2) -> mux (choose fixed or xtal frequency) 56 */ 57 58 int 59 a37x0_periph_fixed_register_fixed(struct clkdom *clkdom, 60 struct a37x0_periph_clknode_def *device_def) 61 { 62 const char *parent_names[PARENT_CNT]; 63 struct clk_fixed_def fixed_def; 64 struct clk_gate_def *gate; 65 struct clk_mux_def *mux; 66 int error, dev_id; 67 68 dev_id = device_def->common_def.device_id; 69 mux = &device_def->clk_def.fixed.mux; 70 gate = &device_def->clk_def.fixed.gate; 71 fixed_def = device_def->clk_def.fixed.fixed; 72 73 fixed_def.clkdef.parent_names = &device_def->common_def.xtal; 74 fixed_def.clkdef.parent_cnt = 1; 75 fixed_def.clkdef.id = A37x0_INTERNAL_CLK_ID(dev_id, FIXED1_POS); 76 fixed_def.clkdef.flags = 0; 77 fixed_def.mult = 1; 78 fixed_def.div = 2; 79 fixed_def.freq = 0; 80 81 parent_names[0] = device_def->common_def.xtal; 82 parent_names[1] = fixed_def.clkdef.name; 83 84 error = clknode_fixed_register(clkdom, &fixed_def); 85 if (error) 86 goto fail; 87 88 a37x0_periph_set_props(&mux->clkdef, parent_names ,PARENT_CNT); 89 error = a37x0_periph_create_mux(clkdom, mux, 90 A37x0_INTERNAL_CLK_ID(dev_id, MUX_POS)); 91 if (error) 92 goto fail; 93 94 a37x0_periph_set_props(&gate->clkdef, &mux->clkdef.name, 1); 95 error = a37x0_periph_create_gate(clkdom, gate, 96 dev_id); 97 if (error) 98 goto fail; 99 100 fail: 101 102 return (error); 103 } 104