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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 7bae13da36477ce451ef5975e0cf79dbe035b52c / . / drivers / phy / qcom / phy-qcom-usb-ss.c
blob: 4e816879c6a1e72faf706f1779599432047a7151 [file] [log] [blame]
Sumit Garg0b746d22022-08-04 19:57:10 +0530[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2022 Sumit Garg <sumit.garg@linaro.org>
4 *
5 * Based on Linux driver
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <generic-phy.h>
11#include <linux/bitops.h>
12#include <asm/io.h>
13#include <reset.h>
14#include <clk.h>
15#include <linux/delay.h>
16
17#define PHY_CTRL0 0x6C
18#define PHY_CTRL1 0x70
19#define PHY_CTRL2 0x74
20#define PHY_CTRL4 0x7C
21
22/* PHY_CTRL bits */
23#define REF_PHY_EN BIT(0)
24#define LANE0_PWR_ON BIT(2)
25#define SWI_PCS_CLK_SEL BIT(4)
26#define TST_PWR_DOWN BIT(4)
27#define PHY_RESET BIT(7)
28
29struct ssphy_priv {
30 void __iomem *base;
31 struct clk_bulk clks;
32 struct reset_ctl com_rst;
33 struct reset_ctl phy_rst;
34};
35
36static inline void ssphy_updatel(void __iomem *addr, u32 mask, u32 val)
37{
38 writel((readl(addr) & ~mask) | val, addr);
39}
40
41static int ssphy_do_reset(struct ssphy_priv *priv)
42{
43 int ret;
44
45 ret = reset_assert(&priv->com_rst);
46 if (ret)
47 return ret;
48
49 ret = reset_assert(&priv->phy_rst);
50 if (ret)
51 return ret;
52
53 udelay(10);
54
55 ret = reset_deassert(&priv->com_rst);
56 if (ret)
57 return ret;
58
59 ret = reset_deassert(&priv->phy_rst);
60 if (ret)
61 return ret;
62
63 return 0;
64}
65
66static int ssphy_power_on(struct phy *phy)
67{
68 struct ssphy_priv *priv = dev_get_priv(phy->dev);
69 int ret;
70
71 ret = ssphy_do_reset(priv);
72 if (ret)
73 return ret;
74
75 writeb(SWI_PCS_CLK_SEL, priv->base + PHY_CTRL0);
76 ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, LANE0_PWR_ON);
77 ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, REF_PHY_EN);
78 ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, 0);
79
80 return 0;
81}
82
83static int ssphy_power_off(struct phy *phy)
84{
85 struct ssphy_priv *priv = dev_get_priv(phy->dev);
86
87 ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, 0);
88 ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, 0);
89 ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, TST_PWR_DOWN);
90
91 return 0;
92}
93
94static int ssphy_clk_init(struct udevice *dev, struct ssphy_priv *priv)
95{
96 int ret;
97
98 ret = clk_get_bulk(dev, &priv->clks);
99 if (ret == -ENOSYS || ret == -ENOENT)
100 return 0;
101 if (ret)
102 return ret;
103
104 ret = clk_enable_bulk(&priv->clks);
105 if (ret) {
106 clk_release_bulk(&priv->clks);
107 return ret;
108 }
109
110 return 0;
111}
112
113static int ssphy_probe(struct udevice *dev)
114{
115 struct ssphy_priv *priv = dev_get_priv(dev);
116 int ret;
117
118 priv->base = (void *)dev_read_addr(dev);
119 if ((ulong)priv->base == FDT_ADDR_T_NONE)
120 return -EINVAL;
121
122 ret = ssphy_clk_init(dev, priv);
123 if (ret)
124 return ret;
125
126 ret = reset_get_by_name(dev, "com", &priv->com_rst);
127 if (ret)
128 return ret;
129
130 ret = reset_get_by_name(dev, "phy", &priv->phy_rst);
131 if (ret)
132 return ret;
133
134 return 0;
135}
136
137static struct phy_ops ssphy_ops = {
138 .power_on = ssphy_power_on,
139 .power_off = ssphy_power_off,
140};
141
142static const struct udevice_id ssphy_ids[] = {
143 { .compatible = "qcom,usb-ss-28nm-phy" },
144 { }
145};
146
147U_BOOT_DRIVER(qcom_usb_ss) = {
148 .name = "qcom-usb-ss",
149 .id = UCLASS_PHY,
150 .of_match = ssphy_ids,
151 .ops = &ssphy_ops,
152 .probe = ssphy_probe,
153 .priv_auto = sizeof(struct ssphy_priv),
154};