1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/io.h>
10 #include <linux/platform_device.h>
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/usb/otg.h>
14 #include <linux/usb/ulpi.h>
15 #include <linux/slab.h>
16 #include <linux/usb.h>
17 #include <linux/usb/hcd.h>
18 #include <linux/platform_data/usb-ehci-mxc.h>
19 #include "ehci.h"
20
21 #define DRIVER_DESC "Freescale On-Chip EHCI Host driver"
22
23 static const char hcd_name[] = "ehci-mxc";
24
25 #define ULPI_VIEWPORT_OFFSET 0x170
26
27 struct ehci_mxc_priv {
28 struct clk *usbclk, *ahbclk, *phyclk;
29 };
30
31 static struct hc_driver __read_mostly ehci_mxc_hc_driver;
32
33 static const struct ehci_driver_overrides ehci_mxc_overrides __initconst = {
34 .extra_priv_size = sizeof(struct ehci_mxc_priv),
35 };
36
ehci_mxc_drv_probe(struct platform_device * pdev)37 static int ehci_mxc_drv_probe(struct platform_device *pdev)
38 {
39 struct device *dev = &pdev->dev;
40 struct mxc_usbh_platform_data *pdata = dev_get_platdata(dev);
41 struct usb_hcd *hcd;
42 struct resource *res;
43 int irq, ret;
44 struct ehci_mxc_priv *priv;
45 struct ehci_hcd *ehci;
46
47 if (!pdata) {
48 dev_err(dev, "No platform data given, bailing out.\n");
49 return -EINVAL;
50 }
51
52 irq = platform_get_irq(pdev, 0);
53 if (irq < 0)
54 return irq;
55
56 hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
57 if (!hcd)
58 return -ENOMEM;
59
60 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
61 hcd->regs = devm_ioremap_resource(dev, res);
62 if (IS_ERR(hcd->regs)) {
63 ret = PTR_ERR(hcd->regs);
64 goto err_alloc;
65 }
66 hcd->rsrc_start = res->start;
67 hcd->rsrc_len = resource_size(res);
68
69 hcd->has_tt = 1;
70 ehci = hcd_to_ehci(hcd);
71 priv = (struct ehci_mxc_priv *) ehci->priv;
72
73 /* enable clocks */
74 priv->usbclk = devm_clk_get(dev, "ipg");
75 if (IS_ERR(priv->usbclk)) {
76 ret = PTR_ERR(priv->usbclk);
77 goto err_alloc;
78 }
79 clk_prepare_enable(priv->usbclk);
80
81 priv->ahbclk = devm_clk_get(dev, "ahb");
82 if (IS_ERR(priv->ahbclk)) {
83 ret = PTR_ERR(priv->ahbclk);
84 goto err_clk_ahb;
85 }
86 clk_prepare_enable(priv->ahbclk);
87
88 /* "dr" device has its own clock on i.MX51 */
89 priv->phyclk = devm_clk_get(dev, "phy");
90 if (IS_ERR(priv->phyclk))
91 priv->phyclk = NULL;
92 if (priv->phyclk)
93 clk_prepare_enable(priv->phyclk);
94
95 /* call platform specific init function */
96 if (pdata->init) {
97 ret = pdata->init(pdev);
98 if (ret) {
99 dev_err(dev, "platform init failed\n");
100 goto err_init;
101 }
102 /* platforms need some time to settle changed IO settings */
103 mdelay(10);
104 }
105
106 /* EHCI registers start at offset 0x100 */
107 ehci->caps = hcd->regs + 0x100;
108 ehci->regs = hcd->regs + 0x100 +
109 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
110
111 /* set up the PORTSCx register */
112 ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
113
114 /* is this really needed? */
115 msleep(10);
116
117 /* Initialize the transceiver */
118 if (pdata->otg) {
119 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
120 ret = usb_phy_init(pdata->otg);
121 if (ret) {
122 dev_err(dev, "unable to init transceiver, probably missing\n");
123 ret = -ENODEV;
124 goto err_add;
125 }
126 ret = otg_set_vbus(pdata->otg->otg, 1);
127 if (ret) {
128 dev_err(dev, "unable to enable vbus on transceiver\n");
129 goto err_add;
130 }
131 }
132
133 platform_set_drvdata(pdev, hcd);
134
135 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
136 if (ret)
137 goto err_add;
138
139 device_wakeup_enable(hcd->self.controller);
140 return 0;
141
142 err_add:
143 if (pdata && pdata->exit)
144 pdata->exit(pdev);
145 err_init:
146 if (priv->phyclk)
147 clk_disable_unprepare(priv->phyclk);
148
149 clk_disable_unprepare(priv->ahbclk);
150 err_clk_ahb:
151 clk_disable_unprepare(priv->usbclk);
152 err_alloc:
153 usb_put_hcd(hcd);
154 return ret;
155 }
156
ehci_mxc_drv_remove(struct platform_device * pdev)157 static int ehci_mxc_drv_remove(struct platform_device *pdev)
158 {
159 struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
160 struct usb_hcd *hcd = platform_get_drvdata(pdev);
161 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
162 struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
163
164 usb_remove_hcd(hcd);
165
166 if (pdata && pdata->exit)
167 pdata->exit(pdev);
168
169 if (pdata && pdata->otg)
170 usb_phy_shutdown(pdata->otg);
171
172 clk_disable_unprepare(priv->usbclk);
173 clk_disable_unprepare(priv->ahbclk);
174
175 if (priv->phyclk)
176 clk_disable_unprepare(priv->phyclk);
177
178 usb_put_hcd(hcd);
179 return 0;
180 }
181
182 MODULE_ALIAS("platform:mxc-ehci");
183
184 static struct platform_driver ehci_mxc_driver = {
185 .probe = ehci_mxc_drv_probe,
186 .remove = ehci_mxc_drv_remove,
187 .shutdown = usb_hcd_platform_shutdown,
188 .driver = {
189 .name = "mxc-ehci",
190 },
191 };
192
ehci_mxc_init(void)193 static int __init ehci_mxc_init(void)
194 {
195 if (usb_disabled())
196 return -ENODEV;
197
198 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
199
200 ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
201 return platform_driver_register(&ehci_mxc_driver);
202 }
203 module_init(ehci_mxc_init);
204
ehci_mxc_cleanup(void)205 static void __exit ehci_mxc_cleanup(void)
206 {
207 platform_driver_unregister(&ehci_mxc_driver);
208 }
209 module_exit(ehci_mxc_cleanup);
210
211 MODULE_DESCRIPTION(DRIVER_DESC);
212 MODULE_AUTHOR("Sascha Hauer");
213 MODULE_LICENSE("GPL");
214