1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (c) 2015 Google, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7#include <common.h> 8#include <dm.h> 9#include <errno.h> 10#include <pwm.h> 11#include <asm/test.h> 12 13enum { 14 NUM_CHANNELS = 3, 15}; 16 17/** 18 * struct sandbox_pwm_chan - a sandbox PWM channel 19 * 20 * @period_ns: Period of the PWM in nanoseconds 21 * @duty_ns: Current duty cycle of the PWM in nanoseconds 22 * @enable: true if the PWM is enabled 23 * @polarity: true if the PWM polarity is active high 24 */ 25struct sandbox_pwm_chan { 26 uint period_ns; 27 uint duty_ns; 28 bool enable; 29 bool polarity; 30}; 31 32struct sandbox_pwm_priv { 33 struct sandbox_pwm_chan chan[NUM_CHANNELS]; 34}; 35 36int sandbox_pwm_get_config(struct udevice *dev, uint channel, uint *period_nsp, 37 uint *duty_nsp, bool *enablep, bool *polarityp) 38{ 39 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 40 struct sandbox_pwm_chan *chan; 41 42 if (channel >= NUM_CHANNELS) 43 return -ENOSPC; 44 chan = &priv->chan[channel]; 45 *period_nsp = chan->period_ns; 46 *duty_nsp = chan->duty_ns; 47 *enablep = chan->enable; 48 *polarityp = chan->polarity; 49 50 return 0; 51} 52 53static int sandbox_pwm_set_config(struct udevice *dev, uint channel, 54 uint period_ns, uint duty_ns) 55{ 56 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 57 struct sandbox_pwm_chan *chan; 58 59 if (channel >= NUM_CHANNELS) 60 return -ENOSPC; 61 chan = &priv->chan[channel]; 62 63 if (channel == 2) { 64 /* Pretend to have some fixed period */ 65 chan->period_ns = 4096; 66 chan->duty_ns = duty_ns * 4096 / period_ns; 67 } else { 68 chan->period_ns = period_ns; 69 chan->duty_ns = duty_ns; 70 } 71 72 return 0; 73} 74 75static int sandbox_pwm_set_enable(struct udevice *dev, uint channel, 76 bool enable) 77{ 78 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 79 struct sandbox_pwm_chan *chan; 80 81 if (channel >= NUM_CHANNELS) 82 return -ENOSPC; 83 chan = &priv->chan[channel]; 84 chan->enable = enable; 85 86 return 0; 87} 88 89static int sandbox_pwm_set_invert(struct udevice *dev, uint channel, 90 bool polarity) 91{ 92 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 93 struct sandbox_pwm_chan *chan; 94 95 if (channel >= NUM_CHANNELS) 96 return -ENOSPC; 97 chan = &priv->chan[channel]; 98 chan->polarity = polarity; 99 100 return 0; 101} 102 103static const struct pwm_ops sandbox_pwm_ops = { 104 .set_config = sandbox_pwm_set_config, 105 .set_enable = sandbox_pwm_set_enable, 106 .set_invert = sandbox_pwm_set_invert, 107}; 108 109static const struct udevice_id sandbox_pwm_ids[] = { 110 { .compatible = "sandbox,pwm" }, 111 { } 112}; 113 114U_BOOT_DRIVER(warm_pwm_sandbox) = { 115 .name = "pwm_sandbox", 116 .id = UCLASS_PWM, 117 .of_match = sandbox_pwm_ids, 118 .ops = &sandbox_pwm_ops, 119 .priv_auto = sizeof(struct sandbox_pwm_priv), 120}; 121