1 /*
2 * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
3 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/io.h>
23 #include <linux/platform_device.h>
24 #include <linux/clk.h>
25 #include <linux/delay.h>
26 #include <linux/usb/otg.h>
27 #include <linux/usb/ulpi.h>
28 #include <linux/slab.h>
29 #include <linux/usb.h>
30 #include <linux/usb/hcd.h>
31 #include <linux/platform_data/usb-ehci-mxc.h>
32 #include "ehci.h"
33
34 #define DRIVER_DESC "Freescale On-Chip EHCI Host driver"
35
36 static const char hcd_name[] = "ehci-mxc";
37
38 #define ULPI_VIEWPORT_OFFSET 0x170
39
40 struct ehci_mxc_priv {
41 struct clk *usbclk, *ahbclk, *phyclk;
42 };
43
44 static struct hc_driver __read_mostly ehci_mxc_hc_driver;
45
46 static const struct ehci_driver_overrides ehci_mxc_overrides __initconst = {
47 .extra_priv_size = sizeof(struct ehci_mxc_priv),
48 };
49
ehci_mxc_drv_probe(struct platform_device * pdev)50 static int ehci_mxc_drv_probe(struct platform_device *pdev)
51 {
52 struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
53 struct usb_hcd *hcd;
54 struct resource *res;
55 int irq, ret;
56 struct ehci_mxc_priv *priv;
57 struct device *dev = &pdev->dev;
58 struct ehci_hcd *ehci;
59
60 if (!pdata) {
61 dev_err(dev, "No platform data given, bailing out.\n");
62 return -EINVAL;
63 }
64
65 irq = platform_get_irq(pdev, 0);
66
67 hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
68 if (!hcd)
69 return -ENOMEM;
70
71 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
72 if (!res) {
73 dev_err(dev, "Found HC with no register addr. Check setup!\n");
74 ret = -ENODEV;
75 goto err_alloc;
76 }
77
78 hcd->rsrc_start = res->start;
79 hcd->rsrc_len = resource_size(res);
80
81 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
82 if (IS_ERR(hcd->regs)) {
83 ret = PTR_ERR(hcd->regs);
84 goto err_alloc;
85 }
86
87 hcd->has_tt = 1;
88 ehci = hcd_to_ehci(hcd);
89 priv = (struct ehci_mxc_priv *) ehci->priv;
90
91 /* enable clocks */
92 priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
93 if (IS_ERR(priv->usbclk)) {
94 ret = PTR_ERR(priv->usbclk);
95 goto err_alloc;
96 }
97 clk_prepare_enable(priv->usbclk);
98
99 priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
100 if (IS_ERR(priv->ahbclk)) {
101 ret = PTR_ERR(priv->ahbclk);
102 goto err_clk_ahb;
103 }
104 clk_prepare_enable(priv->ahbclk);
105
106 /* "dr" device has its own clock on i.MX51 */
107 priv->phyclk = devm_clk_get(&pdev->dev, "phy");
108 if (IS_ERR(priv->phyclk))
109 priv->phyclk = NULL;
110 if (priv->phyclk)
111 clk_prepare_enable(priv->phyclk);
112
113
114 /* call platform specific init function */
115 if (pdata->init) {
116 ret = pdata->init(pdev);
117 if (ret) {
118 dev_err(dev, "platform init failed\n");
119 goto err_init;
120 }
121 /* platforms need some time to settle changed IO settings */
122 mdelay(10);
123 }
124
125 /* EHCI registers start at offset 0x100 */
126 ehci->caps = hcd->regs + 0x100;
127 ehci->regs = hcd->regs + 0x100 +
128 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
129
130 /* set up the PORTSCx register */
131 ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
132
133 /* is this really needed? */
134 msleep(10);
135
136 /* Initialize the transceiver */
137 if (pdata->otg) {
138 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
139 ret = usb_phy_init(pdata->otg);
140 if (ret) {
141 dev_err(dev, "unable to init transceiver, probably missing\n");
142 ret = -ENODEV;
143 goto err_add;
144 }
145 ret = otg_set_vbus(pdata->otg->otg, 1);
146 if (ret) {
147 dev_err(dev, "unable to enable vbus on transceiver\n");
148 goto err_add;
149 }
150 }
151
152 platform_set_drvdata(pdev, hcd);
153
154 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
155 if (ret)
156 goto err_add;
157
158 device_wakeup_enable(hcd->self.controller);
159 return 0;
160
161 err_add:
162 if (pdata && pdata->exit)
163 pdata->exit(pdev);
164 err_init:
165 if (priv->phyclk)
166 clk_disable_unprepare(priv->phyclk);
167
168 clk_disable_unprepare(priv->ahbclk);
169 err_clk_ahb:
170 clk_disable_unprepare(priv->usbclk);
171 err_alloc:
172 usb_put_hcd(hcd);
173 return ret;
174 }
175
ehci_mxc_drv_remove(struct platform_device * pdev)176 static int ehci_mxc_drv_remove(struct platform_device *pdev)
177 {
178 struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
179 struct usb_hcd *hcd = platform_get_drvdata(pdev);
180 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
181 struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
182
183 usb_remove_hcd(hcd);
184
185 if (pdata && pdata->exit)
186 pdata->exit(pdev);
187
188 if (pdata && pdata->otg)
189 usb_phy_shutdown(pdata->otg);
190
191 clk_disable_unprepare(priv->usbclk);
192 clk_disable_unprepare(priv->ahbclk);
193
194 if (priv->phyclk)
195 clk_disable_unprepare(priv->phyclk);
196
197 usb_put_hcd(hcd);
198 return 0;
199 }
200
201 MODULE_ALIAS("platform:mxc-ehci");
202
203 static struct platform_driver ehci_mxc_driver = {
204 .probe = ehci_mxc_drv_probe,
205 .remove = ehci_mxc_drv_remove,
206 .shutdown = usb_hcd_platform_shutdown,
207 .driver = {
208 .name = "mxc-ehci",
209 },
210 };
211
ehci_mxc_init(void)212 static int __init ehci_mxc_init(void)
213 {
214 if (usb_disabled())
215 return -ENODEV;
216
217 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
218
219 ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
220 return platform_driver_register(&ehci_mxc_driver);
221 }
222 module_init(ehci_mxc_init);
223
ehci_mxc_cleanup(void)224 static void __exit ehci_mxc_cleanup(void)
225 {
226 platform_driver_unregister(&ehci_mxc_driver);
227 }
228 module_exit(ehci_mxc_cleanup);
229
230 MODULE_DESCRIPTION(DRIVER_DESC);
231 MODULE_AUTHOR("Sascha Hauer");
232 MODULE_LICENSE("GPL");
233