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 mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
40 struct usb_hcd *hcd;
41 struct resource *res;
42 int irq, ret;
43 struct ehci_mxc_priv *priv;
44 struct device *dev = &pdev->dev;
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
54 hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
55 if (!hcd)
56 return -ENOMEM;
57
58 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
59 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
60 if (IS_ERR(hcd->regs)) {
61 ret = PTR_ERR(hcd->regs);
62 goto err_alloc;
63 }
64 hcd->rsrc_start = res->start;
65 hcd->rsrc_len = resource_size(res);
66
67 hcd->has_tt = 1;
68 ehci = hcd_to_ehci(hcd);
69 priv = (struct ehci_mxc_priv *) ehci->priv;
70
71 /* enable clocks */
72 priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
73 if (IS_ERR(priv->usbclk)) {
74 ret = PTR_ERR(priv->usbclk);
75 goto err_alloc;
76 }
77 clk_prepare_enable(priv->usbclk);
78
79 priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
80 if (IS_ERR(priv->ahbclk)) {
81 ret = PTR_ERR(priv->ahbclk);
82 goto err_clk_ahb;
83 }
84 clk_prepare_enable(priv->ahbclk);
85
86 /* "dr" device has its own clock on i.MX51 */
87 priv->phyclk = devm_clk_get(&pdev->dev, "phy");
88 if (IS_ERR(priv->phyclk))
89 priv->phyclk = NULL;
90 if (priv->phyclk)
91 clk_prepare_enable(priv->phyclk);
92
93
94 /* call platform specific init function */
95 if (pdata->init) {
96 ret = pdata->init(pdev);
97 if (ret) {
98 dev_err(dev, "platform init failed\n");
99 goto err_init;
100 }
101 /* platforms need some time to settle changed IO settings */
102 mdelay(10);
103 }
104
105 /* EHCI registers start at offset 0x100 */
106 ehci->caps = hcd->regs + 0x100;
107 ehci->regs = hcd->regs + 0x100 +
108 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
109
110 /* set up the PORTSCx register */
111 ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
112
113 /* is this really needed? */
114 msleep(10);
115
116 /* Initialize the transceiver */
117 if (pdata->otg) {
118 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
119 ret = usb_phy_init(pdata->otg);
120 if (ret) {
121 dev_err(dev, "unable to init transceiver, probably missing\n");
122 ret = -ENODEV;
123 goto err_add;
124 }
125 ret = otg_set_vbus(pdata->otg->otg, 1);
126 if (ret) {
127 dev_err(dev, "unable to enable vbus on transceiver\n");
128 goto err_add;
129 }
130 }
131
132 platform_set_drvdata(pdev, hcd);
133
134 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
135 if (ret)
136 goto err_add;
137
138 device_wakeup_enable(hcd->self.controller);
139 return 0;
140
141 err_add:
142 if (pdata && pdata->exit)
143 pdata->exit(pdev);
144 err_init:
145 if (priv->phyclk)
146 clk_disable_unprepare(priv->phyclk);
147
148 clk_disable_unprepare(priv->ahbclk);
149 err_clk_ahb:
150 clk_disable_unprepare(priv->usbclk);
151 err_alloc:
152 usb_put_hcd(hcd);
153 return ret;
154 }
155
ehci_mxc_drv_remove(struct platform_device * pdev)156 static int ehci_mxc_drv_remove(struct platform_device *pdev)
157 {
158 struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
159 struct usb_hcd *hcd = platform_get_drvdata(pdev);
160 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
161 struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
162
163 usb_remove_hcd(hcd);
164
165 if (pdata && pdata->exit)
166 pdata->exit(pdev);
167
168 if (pdata && pdata->otg)
169 usb_phy_shutdown(pdata->otg);
170
171 clk_disable_unprepare(priv->usbclk);
172 clk_disable_unprepare(priv->ahbclk);
173
174 if (priv->phyclk)
175 clk_disable_unprepare(priv->phyclk);
176
177 usb_put_hcd(hcd);
178 return 0;
179 }
180
181 MODULE_ALIAS("platform:mxc-ehci");
182
183 static struct platform_driver ehci_mxc_driver = {
184 .probe = ehci_mxc_drv_probe,
185 .remove = ehci_mxc_drv_remove,
186 .shutdown = usb_hcd_platform_shutdown,
187 .driver = {
188 .name = "mxc-ehci",
189 },
190 };
191
ehci_mxc_init(void)192 static int __init ehci_mxc_init(void)
193 {
194 if (usb_disabled())
195 return -ENODEV;
196
197 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
198
199 ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
200 return platform_driver_register(&ehci_mxc_driver);
201 }
202 module_init(ehci_mxc_init);
203
ehci_mxc_cleanup(void)204 static void __exit ehci_mxc_cleanup(void)
205 {
206 platform_driver_unregister(&ehci_mxc_driver);
207 }
208 module_exit(ehci_mxc_cleanup);
209
210 MODULE_DESCRIPTION(DRIVER_DESC);
211 MODULE_AUTHOR("Sascha Hauer");
212 MODULE_LICENSE("GPL");
213