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gerrit.cesnet.cz / github / trini / u-boot / 7a439cadcf3192eb012a2432ca34670b676c74d2 / . / drivers / pwm / rk_pwm.c
blob: 2d289a4c07f12d583116397643467e3424735bbe [file] [log] [blame]
Simon Glass0e23fd82016-01-21 19:44:55 -0700[diff] [blame]1/*
2 * Copyright (c) 2016 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <div64.h>
10#include <dm.h>
11#include <pwm.h>
12#include <regmap.h>
13#include <syscon.h>
14#include <asm/io.h>
15#include <asm/arch/clock.h>
16#include <asm/arch/cru_rk3288.h>
17#include <asm/arch/grf_rk3288.h>
18#include <asm/arch/pwm.h>
19#include <power/regulator.h>
20
21DECLARE_GLOBAL_DATA_PTR;
22
23struct rk_pwm_priv {
24 struct rk3288_pwm *regs;
25 struct rk3288_grf *grf;
26};
27
28static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
29 uint duty_ns)
30{
31 struct rk_pwm_priv *priv = dev_get_priv(dev);
32 struct rk3288_pwm *regs = priv->regs;
33 unsigned long period, duty;
34
35 debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);
36 writel(PWM_SEL_SRC_CLK | PWM_OUTPUT_LEFT | PWM_LP_DISABLE |
37 PWM_CONTINUOUS | PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE |
38 RK_PWM_DISABLE,
39 &regs->ctrl);
40
41 period = lldiv((uint64_t)(PD_BUS_PCLK_HZ / 1000) * period_ns, 1000000);
42 duty = lldiv((uint64_t)(PD_BUS_PCLK_HZ / 1000) * duty_ns, 1000000);
43
44 writel(period, &regs->period_hpr);
45 writel(duty, &regs->duty_lpr);
46 debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);
47
48 return 0;
49}
50
51static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
52{
53 struct rk_pwm_priv *priv = dev_get_priv(dev);
54 struct rk3288_pwm *regs = priv->regs;
55
56 debug("%s: Enable '%s'\n", __func__, dev->name);
57 clrsetbits_le32(&regs->ctrl, RK_PWM_ENABLE, enable ? RK_PWM_ENABLE : 0);
58
59 return 0;
60}
61
62static int rk_pwm_ofdata_to_platdata(struct udevice *dev)
63{
64 struct rk_pwm_priv *priv = dev_get_priv(dev);
65 struct regmap *map;
66
67 priv->regs = (struct rk3288_pwm *)dev_get_addr(dev);
68 map = syscon_get_regmap_by_driver_data(ROCKCHIP_SYSCON_GRF);
69 if (IS_ERR(map))
70 return PTR_ERR(map);
71 priv->grf = regmap_get_range(map, 0);
72
73 return 0;
74}
75
76static int rk_pwm_probe(struct udevice *dev)
77{
78 struct rk_pwm_priv *priv = dev_get_priv(dev);
79
80 rk_setreg(&priv->grf->soc_con2, 1 << 0);
81
82 return 0;
83}
84
85static const struct pwm_ops rk_pwm_ops = {
86 .set_config = rk_pwm_set_config,
87 .set_enable = rk_pwm_set_enable,
88};
89
90static const struct udevice_id rk_pwm_ids[] = {
91 { .compatible = "rockchip,rk3288-pwm" },
92 { }
93};
94
95U_BOOT_DRIVER(rk_pwm) = {
96 .name = "rk_pwm",
97 .id = UCLASS_PWM,
98 .of_match = rk_pwm_ids,
99 .ops = &rk_pwm_ops,
100 .ofdata_to_platdata = rk_pwm_ofdata_to_platdata,
101 .probe = rk_pwm_probe,
102 .priv_auto_alloc_size = sizeof(struct rk_pwm_priv),
103};