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[linux.git] / drivers / usb / cdns3 / cdns3-imx.c
1 // SPDX-License-Identifier: GPL-2.0
2 /**
3  * cdns3-imx.c - NXP i.MX specific Glue layer for Cadence USB Controller
4  *
5  * Copyright (C) 2019 NXP
6  */
7
8 #include <linux/bits.h>
9 #include <linux/clk.h>
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/io.h>
16 #include <linux/of_platform.h>
17 #include <linux/iopoll.h>
18
19 #define USB3_CORE_CTRL1    0x00
20 #define USB3_CORE_CTRL2    0x04
21 #define USB3_INT_REG       0x08
22 #define USB3_CORE_STATUS   0x0c
23 #define XHCI_DEBUG_LINK_ST 0x10
24 #define XHCI_DEBUG_BUS     0x14
25 #define USB3_SSPHY_CTRL1   0x40
26 #define USB3_SSPHY_CTRL2   0x44
27 #define USB3_SSPHY_STATUS  0x4c
28 #define USB2_PHY_CTRL1     0x50
29 #define USB2_PHY_CTRL2     0x54
30 #define USB2_PHY_STATUS    0x5c
31
32 /* Register bits definition */
33
34 /* USB3_CORE_CTRL1 */
35 #define SW_RESET_MASK   (0x3f << 26)
36 #define PWR_SW_RESET    BIT(31)
37 #define APB_SW_RESET    BIT(30)
38 #define AXI_SW_RESET    BIT(29)
39 #define RW_SW_RESET     BIT(28)
40 #define PHY_SW_RESET    BIT(27)
41 #define PHYAHB_SW_RESET BIT(26)
42 #define ALL_SW_RESET    (PWR_SW_RESET | APB_SW_RESET | AXI_SW_RESET | \
43                 RW_SW_RESET | PHY_SW_RESET | PHYAHB_SW_RESET)
44 #define OC_DISABLE      BIT(9)
45 #define MDCTRL_CLK_SEL  BIT(7)
46 #define MODE_STRAP_MASK (0x7)
47 #define DEV_MODE        (1 << 2)
48 #define HOST_MODE       (1 << 1)
49 #define OTG_MODE        (1 << 0)
50
51 /* USB3_INT_REG */
52 #define CLK_125_REQ     BIT(29)
53 #define LPM_CLK_REQ     BIT(28)
54 #define DEVU3_WAEKUP_EN BIT(14)
55 #define OTG_WAKEUP_EN   BIT(12)
56 #define DEV_INT_EN (3 << 8) /* DEV INT b9:8 */
57 #define HOST_INT1_EN (1 << 0) /* HOST INT b7:0 */
58
59 /* USB3_CORE_STATUS */
60 #define MDCTRL_CLK_STATUS       BIT(15)
61 #define DEV_POWER_ON_READY      BIT(13)
62 #define HOST_POWER_ON_READY     BIT(12)
63
64 /* USB3_SSPHY_STATUS */
65 #define CLK_VALID_MASK          (0x3f << 26)
66 #define CLK_VALID_COMPARE_BITS  (0xf << 28)
67 #define PHY_REFCLK_REQ          (1 << 0)
68
69 struct cdns_imx {
70         struct device *dev;
71         void __iomem *noncore;
72         struct clk_bulk_data *clks;
73         int num_clks;
74 };
75
76 static inline u32 cdns_imx_readl(struct cdns_imx *data, u32 offset)
77 {
78         return readl(data->noncore + offset);
79 }
80
81 static inline void cdns_imx_writel(struct cdns_imx *data, u32 offset, u32 value)
82 {
83         writel(value, data->noncore + offset);
84 }
85
86 static const struct clk_bulk_data imx_cdns3_core_clks[] = {
87         { .id = "usb3_lpm_clk" },
88         { .id = "usb3_bus_clk" },
89         { .id = "usb3_aclk" },
90         { .id = "usb3_ipg_clk" },
91         { .id = "usb3_core_pclk" },
92 };
93
94 static int cdns_imx_noncore_init(struct cdns_imx *data)
95 {
96         u32 value;
97         int ret;
98         struct device *dev = data->dev;
99
100         cdns_imx_writel(data, USB3_SSPHY_STATUS, CLK_VALID_MASK);
101         udelay(1);
102         ret = readl_poll_timeout(data->noncore + USB3_SSPHY_STATUS, value,
103                 (value & CLK_VALID_COMPARE_BITS) == CLK_VALID_COMPARE_BITS,
104                 10, 100000);
105         if (ret) {
106                 dev_err(dev, "wait clkvld timeout\n");
107                 return ret;
108         }
109
110         value = cdns_imx_readl(data, USB3_CORE_CTRL1);
111         value |= ALL_SW_RESET;
112         cdns_imx_writel(data, USB3_CORE_CTRL1, value);
113         udelay(1);
114
115         value = cdns_imx_readl(data, USB3_CORE_CTRL1);
116         value = (value & ~MODE_STRAP_MASK) | OTG_MODE | OC_DISABLE;
117         cdns_imx_writel(data, USB3_CORE_CTRL1, value);
118
119         value = cdns_imx_readl(data, USB3_INT_REG);
120         value |= HOST_INT1_EN | DEV_INT_EN;
121         cdns_imx_writel(data, USB3_INT_REG, value);
122
123         value = cdns_imx_readl(data, USB3_CORE_CTRL1);
124         value &= ~ALL_SW_RESET;
125         cdns_imx_writel(data, USB3_CORE_CTRL1, value);
126         return ret;
127 }
128
129 static int cdns_imx_probe(struct platform_device *pdev)
130 {
131         struct device *dev = &pdev->dev;
132         struct device_node *node = dev->of_node;
133         struct cdns_imx *data;
134         int ret;
135
136         if (!node)
137                 return -ENODEV;
138
139         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
140         if (!data)
141                 return -ENOMEM;
142
143         platform_set_drvdata(pdev, data);
144         data->dev = dev;
145         data->noncore = devm_platform_ioremap_resource(pdev, 0);
146         if (IS_ERR(data->noncore)) {
147                 dev_err(dev, "can't map IOMEM resource\n");
148                 return PTR_ERR(data->noncore);
149         }
150
151         data->num_clks = ARRAY_SIZE(imx_cdns3_core_clks);
152         data->clks = (struct clk_bulk_data *)imx_cdns3_core_clks;
153         ret = devm_clk_bulk_get(dev, data->num_clks, data->clks);
154         if (ret)
155                 return ret;
156
157         ret = clk_bulk_prepare_enable(data->num_clks, data->clks);
158         if (ret)
159                 return ret;
160
161         ret = cdns_imx_noncore_init(data);
162         if (ret)
163                 goto err;
164
165         ret = of_platform_populate(node, NULL, NULL, dev);
166         if (ret) {
167                 dev_err(dev, "failed to create children: %d\n", ret);
168                 goto err;
169         }
170
171         return ret;
172
173 err:
174         clk_bulk_disable_unprepare(data->num_clks, data->clks);
175         return ret;
176 }
177
178 static int cdns_imx_remove_core(struct device *dev, void *data)
179 {
180         struct platform_device *pdev = to_platform_device(dev);
181
182         platform_device_unregister(pdev);
183
184         return 0;
185 }
186
187 static int cdns_imx_remove(struct platform_device *pdev)
188 {
189         struct device *dev = &pdev->dev;
190
191         device_for_each_child(dev, NULL, cdns_imx_remove_core);
192         platform_set_drvdata(pdev, NULL);
193
194         return 0;
195 }
196
197 static const struct of_device_id cdns_imx_of_match[] = {
198         { .compatible = "fsl,imx8qm-usb3", },
199         {},
200 };
201 MODULE_DEVICE_TABLE(of, cdns_imx_of_match);
202
203 static struct platform_driver cdns_imx_driver = {
204         .probe          = cdns_imx_probe,
205         .remove         = cdns_imx_remove,
206         .driver         = {
207                 .name   = "cdns3-imx",
208                 .of_match_table = cdns_imx_of_match,
209         },
210 };
211 module_platform_driver(cdns_imx_driver);
212
213 MODULE_ALIAS("platform:cdns3-imx");
214 MODULE_AUTHOR("Peter Chen <[email protected]>");
215 MODULE_LICENSE("GPL v2");
216 MODULE_DESCRIPTION("Cadence USB3 i.MX Glue Layer");
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