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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/platform_device.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/usb/otg.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
7e8d5cd9 DM |
25 | |
26 | #include <mach/mxc_ehci.h> | |
27 | ||
28 | #define ULPI_VIEWPORT_OFFSET 0x170 | |
29 | #define PORTSC_OFFSET 0x184 | |
30 | #define USBMODE_OFFSET 0x1a8 | |
31 | #define USBMODE_CM_HOST 3 | |
32 | ||
33 | struct ehci_mxc_priv { | |
34 | struct clk *usbclk, *ahbclk; | |
35 | struct usb_hcd *hcd; | |
36 | }; | |
37 | ||
38 | /* called during probe() after chip reset completes */ | |
39 | static int ehci_mxc_setup(struct usb_hcd *hcd) | |
40 | { | |
41 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
42 | int retval; | |
43 | ||
44 | /* EHCI registers start at offset 0x100 */ | |
45 | ehci->caps = hcd->regs + 0x100; | |
46 | ehci->regs = hcd->regs + 0x100 + | |
47 | HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); | |
48 | dbg_hcs_params(ehci, "reset"); | |
49 | dbg_hcc_params(ehci, "reset"); | |
50 | ||
51 | /* cache this readonly data; minimize chip reads */ | |
52 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); | |
53 | ||
54 | retval = ehci_halt(ehci); | |
55 | if (retval) | |
56 | return retval; | |
57 | ||
58 | /* data structure init */ | |
59 | retval = ehci_init(hcd); | |
60 | if (retval) | |
61 | return retval; | |
62 | ||
63 | hcd->has_tt = 1; | |
64 | ||
65 | ehci->sbrn = 0x20; | |
66 | ||
67 | ehci_reset(ehci); | |
68 | ||
69 | ehci_port_power(ehci, 0); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static const struct hc_driver ehci_mxc_hc_driver = { | |
74 | .description = hcd_name, | |
75 | .product_desc = "Freescale On-Chip EHCI Host Controller", | |
76 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
77 | ||
78 | /* | |
79 | * generic hardware linkage | |
80 | */ | |
81 | .irq = ehci_irq, | |
82 | .flags = HCD_USB2 | HCD_MEMORY, | |
83 | ||
84 | /* | |
85 | * basic lifecycle operations | |
86 | */ | |
87 | .reset = ehci_mxc_setup, | |
88 | .start = ehci_run, | |
89 | .stop = ehci_stop, | |
90 | .shutdown = ehci_shutdown, | |
91 | ||
92 | /* | |
93 | * managing i/o requests and associated device resources | |
94 | */ | |
95 | .urb_enqueue = ehci_urb_enqueue, | |
96 | .urb_dequeue = ehci_urb_dequeue, | |
97 | .endpoint_disable = ehci_endpoint_disable, | |
98 | ||
99 | /* | |
100 | * scheduling support | |
101 | */ | |
102 | .get_frame_number = ehci_get_frame, | |
103 | ||
104 | /* | |
105 | * root hub support | |
106 | */ | |
107 | .hub_status_data = ehci_hub_status_data, | |
108 | .hub_control = ehci_hub_control, | |
109 | .bus_suspend = ehci_bus_suspend, | |
110 | .bus_resume = ehci_bus_resume, | |
111 | .relinquish_port = ehci_relinquish_port, | |
112 | .port_handed_over = ehci_port_handed_over, | |
113 | }; | |
114 | ||
115 | static int ehci_mxc_drv_probe(struct platform_device *pdev) | |
116 | { | |
117 | struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; | |
118 | struct usb_hcd *hcd; | |
119 | struct resource *res; | |
120 | int irq, ret, temp; | |
121 | struct ehci_mxc_priv *priv; | |
122 | struct device *dev = &pdev->dev; | |
123 | ||
124 | dev_info(&pdev->dev, "initializing i.MX USB Controller\n"); | |
125 | ||
126 | if (!pdata) { | |
127 | dev_err(dev, "No platform data given, bailing out.\n"); | |
128 | return -EINVAL; | |
129 | } | |
130 | ||
131 | irq = platform_get_irq(pdev, 0); | |
132 | ||
133 | hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev)); | |
134 | if (!hcd) | |
135 | return -ENOMEM; | |
136 | ||
137 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
138 | if (!priv) { | |
139 | ret = -ENOMEM; | |
140 | goto err_alloc; | |
141 | } | |
142 | ||
143 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
144 | if (!res) { | |
145 | dev_err(dev, "Found HC with no register addr. Check setup!\n"); | |
146 | ret = -ENODEV; | |
147 | goto err_get_resource; | |
148 | } | |
149 | ||
150 | hcd->rsrc_start = res->start; | |
151 | hcd->rsrc_len = resource_size(res); | |
152 | ||
153 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | |
154 | dev_dbg(dev, "controller already in use\n"); | |
155 | ret = -EBUSY; | |
156 | goto err_request_mem; | |
157 | } | |
158 | ||
159 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
160 | if (!hcd->regs) { | |
161 | dev_err(dev, "error mapping memory\n"); | |
162 | ret = -EFAULT; | |
163 | goto err_ioremap; | |
164 | } | |
165 | ||
2f0e40ab VL |
166 | /* call platform specific init function */ |
167 | if (pdata->init) { | |
168 | ret = pdata->init(pdev); | |
169 | if (ret) { | |
170 | dev_err(dev, "platform init failed\n"); | |
171 | goto err_init; | |
172 | } | |
173 | /* platforms need some time to settle changed IO settings */ | |
174 | mdelay(10); | |
175 | } | |
176 | ||
7e8d5cd9 DM |
177 | /* enable clocks */ |
178 | priv->usbclk = clk_get(dev, "usb"); | |
179 | if (IS_ERR(priv->usbclk)) { | |
180 | ret = PTR_ERR(priv->usbclk); | |
181 | goto err_clk; | |
182 | } | |
183 | clk_enable(priv->usbclk); | |
184 | ||
185 | if (!cpu_is_mx35()) { | |
186 | priv->ahbclk = clk_get(dev, "usb_ahb"); | |
187 | if (IS_ERR(priv->ahbclk)) { | |
188 | ret = PTR_ERR(priv->ahbclk); | |
189 | goto err_clk_ahb; | |
190 | } | |
191 | clk_enable(priv->ahbclk); | |
192 | } | |
193 | ||
194 | /* set USBMODE to host mode */ | |
195 | temp = readl(hcd->regs + USBMODE_OFFSET); | |
196 | writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET); | |
197 | ||
198 | /* set up the PORTSCx register */ | |
199 | writel(pdata->portsc, hcd->regs + PORTSC_OFFSET); | |
200 | mdelay(10); | |
201 | ||
202 | /* setup USBCONTROL. */ | |
203 | ret = mxc_set_usbcontrol(pdev->id, pdata->flags); | |
204 | if (ret < 0) | |
205 | goto err_init; | |
206 | ||
7e8d5cd9 DM |
207 | /* Initialize the transceiver */ |
208 | if (pdata->otg) { | |
209 | pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET; | |
210 | if (otg_init(pdata->otg) != 0) | |
211 | dev_err(dev, "unable to init transceiver\n"); | |
212 | else if (otg_set_vbus(pdata->otg, 1) != 0) | |
213 | dev_err(dev, "unable to enable vbus on transceiver\n"); | |
214 | } | |
215 | ||
216 | priv->hcd = hcd; | |
217 | platform_set_drvdata(pdev, priv); | |
218 | ||
219 | ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); | |
220 | if (ret) | |
221 | goto err_add; | |
222 | ||
223 | return 0; | |
224 | ||
225 | err_add: | |
226 | if (pdata && pdata->exit) | |
227 | pdata->exit(pdev); | |
228 | err_init: | |
229 | if (priv->ahbclk) { | |
230 | clk_disable(priv->ahbclk); | |
231 | clk_put(priv->ahbclk); | |
232 | } | |
233 | err_clk_ahb: | |
234 | clk_disable(priv->usbclk); | |
235 | clk_put(priv->usbclk); | |
236 | err_clk: | |
237 | iounmap(hcd->regs); | |
238 | err_ioremap: | |
239 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
240 | err_request_mem: | |
241 | err_get_resource: | |
242 | kfree(priv); | |
243 | err_alloc: | |
244 | usb_put_hcd(hcd); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | static int __exit ehci_mxc_drv_remove(struct platform_device *pdev) | |
249 | { | |
250 | struct mxc_usbh_platform_data *pdata = pdev->dev.platform_data; | |
251 | struct ehci_mxc_priv *priv = platform_get_drvdata(pdev); | |
252 | struct usb_hcd *hcd = priv->hcd; | |
253 | ||
254 | if (pdata && pdata->exit) | |
255 | pdata->exit(pdev); | |
256 | ||
257 | if (pdata->otg) | |
258 | otg_shutdown(pdata->otg); | |
259 | ||
260 | usb_remove_hcd(hcd); | |
261 | iounmap(hcd->regs); | |
262 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
263 | usb_put_hcd(hcd); | |
264 | platform_set_drvdata(pdev, NULL); | |
265 | ||
266 | clk_disable(priv->usbclk); | |
267 | clk_put(priv->usbclk); | |
268 | if (priv->ahbclk) { | |
269 | clk_disable(priv->ahbclk); | |
270 | clk_put(priv->ahbclk); | |
271 | } | |
272 | ||
273 | kfree(priv); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static void ehci_mxc_drv_shutdown(struct platform_device *pdev) | |
279 | { | |
280 | struct ehci_mxc_priv *priv = platform_get_drvdata(pdev); | |
281 | struct usb_hcd *hcd = priv->hcd; | |
282 | ||
283 | if (hcd->driver->shutdown) | |
284 | hcd->driver->shutdown(hcd); | |
285 | } | |
286 | ||
287 | MODULE_ALIAS("platform:mxc-ehci"); | |
288 | ||
289 | static struct platform_driver ehci_mxc_driver = { | |
290 | .probe = ehci_mxc_drv_probe, | |
291 | .remove = __exit_p(ehci_mxc_drv_remove), | |
292 | .shutdown = ehci_mxc_drv_shutdown, | |
293 | .driver = { | |
294 | .name = "mxc-ehci", | |
295 | }, | |
296 | }; |