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 13 enum { 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 */ 25 struct sandbox_pwm_chan { 26 uint period_ns; 27 uint duty_ns; 28 bool enable; 29 bool polarity; 30 }; 31 32 struct sandbox_pwm_priv { 33 struct sandbox_pwm_chan chan[NUM_CHANNELS]; 34 }; 35 36 int 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 53 static 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 chan->period_ns = period_ns; 63 chan->duty_ns = duty_ns; 64 65 return 0; 66 } 67 68 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel, 69 bool enable) 70 { 71 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 72 struct sandbox_pwm_chan *chan; 73 74 if (channel >= NUM_CHANNELS) 75 return -ENOSPC; 76 chan = &priv->chan[channel]; 77 chan->enable = enable; 78 79 return 0; 80 } 81 82 static int sandbox_pwm_set_invert(struct udevice *dev, uint channel, 83 bool polarity) 84 { 85 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 86 struct sandbox_pwm_chan *chan; 87 88 if (channel >= NUM_CHANNELS) 89 return -ENOSPC; 90 chan = &priv->chan[channel]; 91 chan->polarity = polarity; 92 93 return 0; 94 } 95 96 static const struct pwm_ops sandbox_pwm_ops = { 97 .set_config = sandbox_pwm_set_config, 98 .set_enable = sandbox_pwm_set_enable, 99 .set_invert = sandbox_pwm_set_invert, 100 }; 101 102 static const struct udevice_id sandbox_pwm_ids[] = { 103 { .compatible = "sandbox,pwm" }, 104 { } 105 }; 106 107 U_BOOT_DRIVER(warm_pwm_sandbox) = { 108 .name = "pwm_sandbox", 109 .id = UCLASS_PWM, 110 .of_match = sandbox_pwm_ids, 111 .ops = &sandbox_pwm_ops, 112 .priv_auto_alloc_size = sizeof(struct sandbox_pwm_priv), 113 }; 114