2 * Copyright (c) 2016 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
5 * SPDX-License-Identifier: GPL-2.0+
16 #include <asm/arch/clock.h>
17 #include <asm/arch/grf_rk3288.h>
18 #include <asm/arch/pwm.h>
19 #include <asm/arch/hardware.h>
20 #include <power/regulator.h>
22 DECLARE_GLOBAL_DATA_PTR;
25 struct rk3288_pwm *regs;
26 struct rk3288_grf *grf;
30 static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
33 struct rk_pwm_priv *priv = dev_get_priv(dev);
34 struct rk3288_pwm *regs = priv->regs;
35 unsigned long period, duty;
37 debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
38 writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
39 PWM_CONTINUOUS | PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE |
43 period = lldiv((uint64_t)(priv->freq / 1000) * period_ns, 1000000);
44 duty = lldiv((uint64_t)(priv->freq / 1000) * duty_ns, 1000000);
46 writel(period, ®s->period_hpr);
47 writel(duty, ®s->duty_lpr);
48 debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
53 static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
55 struct rk_pwm_priv *priv = dev_get_priv(dev);
56 struct rk3288_pwm *regs = priv->regs;
58 debug("%s: Enable '%s'\n", __func__, dev->name);
59 clrsetbits_le32(®s->ctrl, RK_PWM_ENABLE, enable ? RK_PWM_ENABLE : 0);
64 static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
66 struct rk_pwm_priv *priv = dev_get_priv(dev);
69 priv->regs = (struct rk3288_pwm *)dev_get_addr(dev);
70 map = syscon_get_regmap_by_driver_data(ROCKCHIP_SYSCON_GRF);
73 priv->grf = regmap_get_range(map, 0);
78 static int rk_pwm_probe(struct udevice *dev)
80 struct rk_pwm_priv *priv = dev_get_priv(dev);
84 rk_setreg(&priv->grf->soc_con2, 1 << 0);
86 ret = clk_get_by_index(dev, 0, &clk);
88 debug("%s get clock fail!\n", __func__);
91 priv->freq = clk_get_rate(&clk);
96 static const struct pwm_ops rk_pwm_ops = {
97 .set_config = rk_pwm_set_config,
98 .set_enable = rk_pwm_set_enable,
101 static const struct udevice_id rk_pwm_ids[] = {
102 { .compatible = "rockchip,rk3288-pwm" },
106 U_BOOT_DRIVER(rk_pwm) = {
109 .of_match = rk_pwm_ids,
111 .ofdata_to_platdata = rk_pwm_ofdata_to_platdata,
112 .probe = rk_pwm_probe,
113 .priv_auto_alloc_size = sizeof(struct rk_pwm_priv),