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 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
73 if (IS_ERR(hcd->regs)) {
74 ret = PTR_ERR(hcd->regs);
75 goto err_alloc;
76 }
77 hcd->rsrc_start = res->start;
78 hcd->rsrc_len = resource_size(res);
79
80 hcd->has_tt = 1;
81 ehci = hcd_to_ehci(hcd);
82 priv = (struct ehci_mxc_priv *) ehci->priv;
83
84 /* enable clocks */
85 priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
86 if (IS_ERR(priv->usbclk)) {
87 ret = PTR_ERR(priv->usbclk);
88 goto err_alloc;
89 }
90 clk_prepare_enable(priv->usbclk);
91
92 priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
93 if (IS_ERR(priv->ahbclk)) {
94 ret = PTR_ERR(priv->ahbclk);
95 goto err_clk_ahb;
96 }
97 clk_prepare_enable(priv->ahbclk);
98
99 /* "dr" device has its own clock on i.MX51 */
100 priv->phyclk = devm_clk_get(&pdev->dev, "phy");
101 if (IS_ERR(priv->phyclk))
102 priv->phyclk = NULL;
103 if (priv->phyclk)
104 clk_prepare_enable(priv->phyclk);
105
106
107 /* call platform specific init function */
108 if (pdata->init) {
109 ret = pdata->init(pdev);
110 if (ret) {
111 dev_err(dev, "platform init failed\n");
112 goto err_init;
113 }
114 /* platforms need some time to settle changed IO settings */
115 mdelay(10);
116 }
117
118 /* EHCI registers start at offset 0x100 */
119 ehci->caps = hcd->regs + 0x100;
120 ehci->regs = hcd->regs + 0x100 +
121 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
122
123 /* set up the PORTSCx register */
124 ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
125
126 /* is this really needed? */
127 msleep(10);
128
129 /* Initialize the transceiver */
130 if (pdata->otg) {
131 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
132 ret = usb_phy_init(pdata->otg);
133 if (ret) {
134 dev_err(dev, "unable to init transceiver, probably missing\n");
135 ret = -ENODEV;
136 goto err_add;
137 }
138 ret = otg_set_vbus(pdata->otg->otg, 1);
139 if (ret) {
140 dev_err(dev, "unable to enable vbus on transceiver\n");
141 goto err_add;
142 }
143 }
144
145 platform_set_drvdata(pdev, hcd);
146
147 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
148 if (ret)
149 goto err_add;
150
151 device_wakeup_enable(hcd->self.controller);
152 return 0;
153
154 err_add:
155 if (pdata && pdata->exit)
156 pdata->exit(pdev);
157 err_init:
158 if (priv->phyclk)
159 clk_disable_unprepare(priv->phyclk);
160
161 clk_disable_unprepare(priv->ahbclk);
162 err_clk_ahb:
163 clk_disable_unprepare(priv->usbclk);
164 err_alloc:
165 usb_put_hcd(hcd);
166 return ret;
167 }
168
ehci_mxc_drv_remove(struct platform_device * pdev)169 static int ehci_mxc_drv_remove(struct platform_device *pdev)
170 {
171 struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
172 struct usb_hcd *hcd = platform_get_drvdata(pdev);
173 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
174 struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
175
176 usb_remove_hcd(hcd);
177
178 if (pdata && pdata->exit)
179 pdata->exit(pdev);
180
181 if (pdata && pdata->otg)
182 usb_phy_shutdown(pdata->otg);
183
184 clk_disable_unprepare(priv->usbclk);
185 clk_disable_unprepare(priv->ahbclk);
186
187 if (priv->phyclk)
188 clk_disable_unprepare(priv->phyclk);
189
190 usb_put_hcd(hcd);
191 return 0;
192 }
193
194 MODULE_ALIAS("platform:mxc-ehci");
195
196 static struct platform_driver ehci_mxc_driver = {
197 .probe = ehci_mxc_drv_probe,
198 .remove = ehci_mxc_drv_remove,
199 .shutdown = usb_hcd_platform_shutdown,
200 .driver = {
201 .name = "mxc-ehci",
202 },
203 };
204
ehci_mxc_init(void)205 static int __init ehci_mxc_init(void)
206 {
207 if (usb_disabled())
208 return -ENODEV;
209
210 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
211
212 ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
213 return platform_driver_register(&ehci_mxc_driver);
214 }
215 module_init(ehci_mxc_init);
216
ehci_mxc_cleanup(void)217 static void __exit ehci_mxc_cleanup(void)
218 {
219 platform_driver_unregister(&ehci_mxc_driver);
220 }
221 module_exit(ehci_mxc_cleanup);
222
223 MODULE_DESCRIPTION(DRIVER_DESC);
224 MODULE_AUTHOR("Sascha Hauer");
225 MODULE_LICENSE("GPL");
226