tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
69struct cdns_imx {
70 struct device *dev;
71 void __iomem *noncore;
72 struct clk_bulk_data *clks;
73 int num_clks;
74};
75
76static inline u32 cdns_imx_readl(struct cdns_imx *data, u32 offset)
77{
78 return readl(data->noncore + offset);
79}
80
81static inline void cdns_imx_writel(struct cdns_imx *data, u32 offset, u32 value)
82{
83 writel(value, data->noncore + offset);
84}
85
86static 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
94static 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
129static 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
173err:
174 clk_bulk_disable_unprepare(data->num_clks, data->clks);
175 return ret;
176}
177
178static 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
187static 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
197static const struct of_device_id cdns_imx_of_match[] = {
198 { .compatible = "fsl,imx8qm-usb3", },
199 {},
200};
201MODULE_DEVICE_TABLE(of, cdns_imx_of_match);
202
203static 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};
211module_platform_driver(cdns_imx_driver);
212
213MODULE_ALIAS("platform:cdns3-imx");
214MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
215MODULE_LICENSE("GPL v2");
216MODULE_DESCRIPTION("Cadence USB3 i.MX Glue Layer");