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22ced687 A |
1 | /* |
2 | * PMC MSP EHCI (Host Controller Driver) for USB. | |
3 | * | |
4 | * (C) Copyright 2006-2010 PMC-Sierra Inc | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
10 | */ | |
11 | ||
12 | /* includes */ | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/usb.h> | |
16 | #include <msp_usb.h> | |
17 | ||
18 | /* stream disable*/ | |
19 | #define USB_CTRL_MODE_STREAM_DISABLE 0x10 | |
20 | ||
21 | /* threshold */ | |
22 | #define USB_CTRL_FIFO_THRESH 0x00300000 | |
23 | ||
24 | /* register offset for usb_mode */ | |
25 | #define USB_EHCI_REG_USB_MODE 0x68 | |
26 | ||
27 | /* register offset for usb fifo */ | |
28 | #define USB_EHCI_REG_USB_FIFO 0x24 | |
29 | ||
30 | /* register offset for usb status */ | |
31 | #define USB_EHCI_REG_USB_STATUS 0x44 | |
32 | ||
33 | /* serial/parallel transceiver */ | |
34 | #define USB_EHCI_REG_BIT_STAT_STS (1<<29) | |
35 | ||
36 | /* TWI USB0 host device pin */ | |
37 | #define MSP_PIN_USB0_HOST_DEV 49 | |
38 | ||
39 | /* TWI USB1 host device pin */ | |
40 | #define MSP_PIN_USB1_HOST_DEV 50 | |
41 | ||
42 | ||
43 | static void usb_hcd_tdi_set_mode(struct ehci_hcd *ehci) | |
44 | { | |
45 | u8 *base; | |
46 | u8 *statreg; | |
47 | u8 *fiforeg; | |
48 | u32 val; | |
49 | struct ehci_regs *reg_base = ehci->regs; | |
50 | ||
51 | /* get register base */ | |
52 | base = (u8 *)reg_base + USB_EHCI_REG_USB_MODE; | |
53 | statreg = (u8 *)reg_base + USB_EHCI_REG_USB_STATUS; | |
54 | fiforeg = (u8 *)reg_base + USB_EHCI_REG_USB_FIFO; | |
55 | ||
56 | /* Disable controller mode stream */ | |
57 | val = ehci_readl(ehci, (u32 *)base); | |
58 | ehci_writel(ehci, (val | USB_CTRL_MODE_STREAM_DISABLE), | |
59 | (u32 *)base); | |
60 | ||
61 | /* clear STS to select parallel transceiver interface */ | |
62 | val = ehci_readl(ehci, (u32 *)statreg); | |
63 | val = val & ~USB_EHCI_REG_BIT_STAT_STS; | |
64 | ehci_writel(ehci, val, (u32 *)statreg); | |
65 | ||
66 | /* write to set the proper fifo threshold */ | |
67 | ehci_writel(ehci, USB_CTRL_FIFO_THRESH, (u32 *)fiforeg); | |
68 | ||
69 | /* set TWI GPIO USB_HOST_DEV pin high */ | |
70 | gpio_direction_output(MSP_PIN_USB0_HOST_DEV, 1); | |
22ced687 A |
71 | } |
72 | ||
73 | /* called during probe() after chip reset completes */ | |
74 | static int ehci_msp_setup(struct usb_hcd *hcd) | |
75 | { | |
76 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
77 | int retval; | |
1a49e2ac | 78 | |
22ced687 A |
79 | ehci->big_endian_mmio = 1; |
80 | ehci->big_endian_desc = 1; | |
81 | ||
82 | ehci->caps = hcd->regs; | |
22ced687 A |
83 | hcd->has_tt = 1; |
84 | ||
1a49e2ac | 85 | retval = ehci_setup(hcd); |
22ced687 A |
86 | if (retval) |
87 | return retval; | |
88 | ||
89 | usb_hcd_tdi_set_mode(ehci); | |
22ced687 A |
90 | |
91 | return retval; | |
92 | } | |
93 | ||
94 | ||
95 | /* configure so an HC device and id are always provided | |
96 | * always called with process context; sleeping is OK | |
97 | */ | |
98 | ||
99 | static int usb_hcd_msp_map_regs(struct mspusb_device *dev) | |
100 | { | |
101 | struct resource *res; | |
102 | struct platform_device *pdev = &dev->dev; | |
103 | u32 res_len; | |
104 | int retval; | |
105 | ||
106 | /* MAB register space */ | |
107 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
108 | if (res == NULL) | |
109 | return -ENOMEM; | |
28f65c11 | 110 | res_len = resource_size(res); |
22ced687 A |
111 | if (!request_mem_region(res->start, res_len, "mab regs")) |
112 | return -EBUSY; | |
113 | ||
114 | dev->mab_regs = ioremap_nocache(res->start, res_len); | |
115 | if (dev->mab_regs == NULL) { | |
116 | retval = -ENOMEM; | |
117 | goto err1; | |
118 | } | |
119 | ||
120 | /* MSP USB register space */ | |
121 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
122 | if (res == NULL) { | |
123 | retval = -ENOMEM; | |
124 | goto err2; | |
125 | } | |
28f65c11 | 126 | res_len = resource_size(res); |
22ced687 A |
127 | if (!request_mem_region(res->start, res_len, "usbid regs")) { |
128 | retval = -EBUSY; | |
129 | goto err2; | |
130 | } | |
131 | dev->usbid_regs = ioremap_nocache(res->start, res_len); | |
132 | if (dev->usbid_regs == NULL) { | |
133 | retval = -ENOMEM; | |
134 | goto err3; | |
135 | } | |
136 | ||
137 | return 0; | |
138 | err3: | |
139 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
28f65c11 | 140 | res_len = resource_size(res); |
22ced687 A |
141 | release_mem_region(res->start, res_len); |
142 | err2: | |
143 | iounmap(dev->mab_regs); | |
144 | err1: | |
145 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
28f65c11 | 146 | res_len = resource_size(res); |
22ced687 A |
147 | release_mem_region(res->start, res_len); |
148 | dev_err(&pdev->dev, "Failed to map non-EHCI regs.\n"); | |
149 | return retval; | |
150 | } | |
151 | ||
152 | /** | |
153 | * usb_hcd_msp_probe - initialize PMC MSP-based HCDs | |
154 | * Context: !in_interrupt() | |
155 | * | |
156 | * Allocates basic resources for this USB host controller, and | |
157 | * then invokes the start() method for the HCD associated with it | |
158 | * through the hotplug entry's driver_data. | |
159 | * | |
160 | */ | |
161 | int usb_hcd_msp_probe(const struct hc_driver *driver, | |
162 | struct platform_device *dev) | |
163 | { | |
164 | int retval; | |
165 | struct usb_hcd *hcd; | |
166 | struct resource *res; | |
167 | struct ehci_hcd *ehci ; | |
168 | ||
169 | hcd = usb_create_hcd(driver, &dev->dev, "pmcmsp"); | |
170 | if (!hcd) | |
171 | return -ENOMEM; | |
172 | ||
173 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
174 | if (res == NULL) { | |
175 | pr_debug("No IOMEM resource info for %s.\n", dev->name); | |
176 | retval = -ENOMEM; | |
177 | goto err1; | |
178 | } | |
179 | hcd->rsrc_start = res->start; | |
28f65c11 | 180 | hcd->rsrc_len = resource_size(res); |
22ced687 A |
181 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, dev->name)) { |
182 | retval = -EBUSY; | |
183 | goto err1; | |
184 | } | |
185 | hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); | |
186 | if (!hcd->regs) { | |
187 | pr_debug("ioremap failed"); | |
188 | retval = -ENOMEM; | |
189 | goto err2; | |
190 | } | |
191 | ||
192 | res = platform_get_resource(dev, IORESOURCE_IRQ, 0); | |
193 | if (res == NULL) { | |
194 | dev_err(&dev->dev, "No IRQ resource info for %s.\n", dev->name); | |
195 | retval = -ENOMEM; | |
196 | goto err3; | |
197 | } | |
198 | ||
199 | /* Map non-EHCI register spaces */ | |
200 | retval = usb_hcd_msp_map_regs(to_mspusb_device(dev)); | |
201 | if (retval != 0) | |
202 | goto err3; | |
203 | ||
204 | ehci = hcd_to_ehci(hcd); | |
205 | ehci->big_endian_mmio = 1; | |
206 | ehci->big_endian_desc = 1; | |
207 | ||
208 | ||
209 | retval = usb_add_hcd(hcd, res->start, IRQF_SHARED); | |
3c9740a1 PC |
210 | if (retval == 0) { |
211 | device_wakeup_enable(hcd->self.controller); | |
22ced687 | 212 | return 0; |
3c9740a1 | 213 | } |
22ced687 A |
214 | |
215 | usb_remove_hcd(hcd); | |
216 | err3: | |
217 | iounmap(hcd->regs); | |
218 | err2: | |
219 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
220 | err1: | |
221 | usb_put_hcd(hcd); | |
222 | ||
223 | return retval; | |
224 | } | |
225 | ||
226 | ||
227 | ||
228 | /** | |
229 | * usb_hcd_msp_remove - shutdown processing for PMC MSP-based HCDs | |
230 | * @dev: USB Host Controller being removed | |
231 | * Context: !in_interrupt() | |
232 | * | |
233 | * Reverses the effect of usb_hcd_msp_probe(), first invoking | |
234 | * the HCD's stop() method. It is always called from a thread | |
235 | * context, normally "rmmod", "apmd", or something similar. | |
236 | * | |
237 | * may be called without controller electrically present | |
238 | * may be called with controller, bus, and devices active | |
239 | */ | |
240 | void usb_hcd_msp_remove(struct usb_hcd *hcd, struct platform_device *dev) | |
241 | { | |
242 | usb_remove_hcd(hcd); | |
243 | iounmap(hcd->regs); | |
244 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
245 | usb_put_hcd(hcd); | |
246 | } | |
247 | ||
22ced687 A |
248 | static const struct hc_driver ehci_msp_hc_driver = { |
249 | .description = hcd_name, | |
250 | .product_desc = "PMC MSP EHCI", | |
251 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
252 | ||
253 | /* | |
254 | * generic hardware linkage | |
255 | */ | |
22ced687 | 256 | .irq = ehci_irq, |
c04ee4b1 | 257 | .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, |
22ced687 A |
258 | |
259 | /* | |
260 | * basic lifecycle operations | |
261 | */ | |
a3b0f9b9 | 262 | .reset = ehci_msp_setup, |
22ced687 A |
263 | .shutdown = ehci_shutdown, |
264 | .start = ehci_run, | |
265 | .stop = ehci_stop, | |
266 | ||
267 | /* | |
268 | * managing i/o requests and associated device resources | |
269 | */ | |
270 | .urb_enqueue = ehci_urb_enqueue, | |
271 | .urb_dequeue = ehci_urb_dequeue, | |
272 | .endpoint_disable = ehci_endpoint_disable, | |
273 | .endpoint_reset = ehci_endpoint_reset, | |
274 | ||
275 | /* | |
276 | * scheduling support | |
277 | */ | |
278 | .get_frame_number = ehci_get_frame, | |
279 | ||
280 | /* | |
281 | * root hub support | |
282 | */ | |
283 | .hub_status_data = ehci_hub_status_data, | |
284 | .hub_control = ehci_hub_control, | |
285 | .bus_suspend = ehci_bus_suspend, | |
286 | .bus_resume = ehci_bus_resume, | |
287 | .relinquish_port = ehci_relinquish_port, | |
288 | .port_handed_over = ehci_port_handed_over, | |
289 | ||
290 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
291 | }; | |
292 | ||
293 | static int ehci_hcd_msp_drv_probe(struct platform_device *pdev) | |
294 | { | |
295 | int ret; | |
296 | ||
297 | pr_debug("In ehci_hcd_msp_drv_probe"); | |
298 | ||
299 | if (usb_disabled()) | |
300 | return -ENODEV; | |
301 | ||
302 | gpio_request(MSP_PIN_USB0_HOST_DEV, "USB0_HOST_DEV_GPIO"); | |
22ced687 A |
303 | |
304 | ret = usb_hcd_msp_probe(&ehci_msp_hc_driver, pdev); | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
309 | static int ehci_hcd_msp_drv_remove(struct platform_device *pdev) | |
310 | { | |
311 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
312 | ||
313 | usb_hcd_msp_remove(hcd, pdev); | |
314 | ||
315 | /* free TWI GPIO USB_HOST_DEV pin */ | |
316 | gpio_free(MSP_PIN_USB0_HOST_DEV); | |
22ced687 A |
317 | |
318 | return 0; | |
319 | } | |
320 | ||
321 | MODULE_ALIAS("pmcmsp-ehci"); | |
322 | ||
323 | static struct platform_driver ehci_hcd_msp_driver = { | |
324 | .probe = ehci_hcd_msp_drv_probe, | |
325 | .remove = ehci_hcd_msp_drv_remove, | |
326 | .driver = { | |
327 | .name = "pmcmsp-ehci", | |
22ced687 A |
328 | }, |
329 | }; |