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23#include <linux/clk.h>
24#include <linux/err.h>
25#include <linux/io.h>
26#include <linux/module.h>
27#include <linux/phy/phy.h>
28#include <linux/usb/of.h>
29#include <linux/platform_device.h>
30#include <linux/reset.h>
31
32#define SUNXI_AHB_INCR16_BURST_EN BIT(11)
33#define SUNXI_AHB_INCR8_BURST_EN BIT(10)
34#define SUNXI_AHB_INCR4_BURST_EN BIT(9)
35#define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
36#define SUNXI_ULPI_BYPASS_EN BIT(0)
37
38
39#define SUNXI_EHCI_HS_FORCE BIT(20)
40#define SUNXI_HSIC_CONNECT_DET BIT(17)
41#define SUNXI_HSIC_CONNECT_INT BIT(16)
42#define SUNXI_HSIC BIT(1)
43
44struct sun9i_usb_phy {
45 struct phy *phy;
46 void __iomem *pmu;
47 struct reset_control *reset;
48 struct clk *clk;
49 struct clk *hsic_clk;
50 enum usb_phy_interface type;
51};
52
53static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
54{
55 u32 bits, reg_value;
56
57 bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |
58 SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |
59 SUNXI_ULPI_BYPASS_EN;
60
61 if (phy->type == USBPHY_INTERFACE_MODE_HSIC)
62 bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |
63 SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;
64
65 reg_value = readl(phy->pmu);
66
67 if (enable)
68 reg_value |= bits;
69 else
70 reg_value &= ~bits;
71
72 writel(reg_value, phy->pmu);
73}
74
75static int sun9i_usb_phy_init(struct phy *_phy)
76{
77 struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
78 int ret;
79
80 ret = clk_prepare_enable(phy->clk);
81 if (ret)
82 goto err_clk;
83
84 ret = clk_prepare_enable(phy->hsic_clk);
85 if (ret)
86 goto err_hsic_clk;
87
88 ret = reset_control_deassert(phy->reset);
89 if (ret)
90 goto err_reset;
91
92 sun9i_usb_phy_passby(phy, 1);
93 return 0;
94
95err_reset:
96 clk_disable_unprepare(phy->hsic_clk);
97
98err_hsic_clk:
99 clk_disable_unprepare(phy->clk);
100
101err_clk:
102 return ret;
103}
104
105static int sun9i_usb_phy_exit(struct phy *_phy)
106{
107 struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
108
109 sun9i_usb_phy_passby(phy, 0);
110 reset_control_assert(phy->reset);
111 clk_disable_unprepare(phy->hsic_clk);
112 clk_disable_unprepare(phy->clk);
113
114 return 0;
115}
116
117static struct phy_ops sun9i_usb_phy_ops = {
118 .init = sun9i_usb_phy_init,
119 .exit = sun9i_usb_phy_exit,
120 .owner = THIS_MODULE,
121};
122
123static int sun9i_usb_phy_probe(struct platform_device *pdev)
124{
125 struct sun9i_usb_phy *phy;
126 struct device *dev = &pdev->dev;
127 struct device_node *np = dev->of_node;
128 struct phy_provider *phy_provider;
129 struct resource *res;
130
131 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
132 if (!phy)
133 return -ENOMEM;
134
135 phy->type = of_usb_get_phy_mode(np);
136 if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
137 phy->clk = devm_clk_get(dev, "hsic_480M");
138 if (IS_ERR(phy->clk)) {
139 dev_err(dev, "failed to get hsic_480M clock\n");
140 return PTR_ERR(phy->clk);
141 }
142
143 phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
144 if (IS_ERR(phy->clk)) {
145 dev_err(dev, "failed to get hsic_12M clock\n");
146 return PTR_ERR(phy->clk);
147 }
148
149 phy->reset = devm_reset_control_get(dev, "hsic");
150 if (IS_ERR(phy->reset)) {
151 dev_err(dev, "failed to get reset control\n");
152 return PTR_ERR(phy->reset);
153 }
154 } else {
155 phy->clk = devm_clk_get(dev, "phy");
156 if (IS_ERR(phy->clk)) {
157 dev_err(dev, "failed to get phy clock\n");
158 return PTR_ERR(phy->clk);
159 }
160
161 phy->reset = devm_reset_control_get(dev, "phy");
162 if (IS_ERR(phy->reset)) {
163 dev_err(dev, "failed to get reset control\n");
164 return PTR_ERR(phy->reset);
165 }
166 }
167
168 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
169 phy->pmu = devm_ioremap_resource(dev, res);
170 if (IS_ERR(phy->pmu))
171 return PTR_ERR(phy->pmu);
172
173 phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
174 if (IS_ERR(phy->phy)) {
175 dev_err(dev, "failed to create PHY\n");
176 return PTR_ERR(phy->phy);
177 }
178
179 phy_set_drvdata(phy->phy, phy);
180 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
181
182 return PTR_ERR_OR_ZERO(phy_provider);
183}
184
185static const struct of_device_id sun9i_usb_phy_of_match[] = {
186 { .compatible = "allwinner,sun9i-a80-usb-phy" },
187 { },
188};
189MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
190
191static struct platform_driver sun9i_usb_phy_driver = {
192 .probe = sun9i_usb_phy_probe,
193 .driver = {
194 .of_match_table = sun9i_usb_phy_of_match,
195 .name = "sun9i-usb-phy",
196 }
197};
198module_platform_driver(sun9i_usb_phy_driver);
199
200MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
201MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
202MODULE_LICENSE("GPL");
203
