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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); | |
71 | #ifdef CONFIG_MSP_HAS_DUAL_USB | |
72 | gpio_direction_output(MSP_PIN_USB1_HOST_DEV, 1); | |
73 | #endif | |
74 | } | |
75 | ||
76 | /* called during probe() after chip reset completes */ | |
77 | static int ehci_msp_setup(struct usb_hcd *hcd) | |
78 | { | |
79 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
80 | int retval; | |
81 | ehci->big_endian_mmio = 1; | |
82 | ehci->big_endian_desc = 1; | |
83 | ||
84 | ehci->caps = hcd->regs; | |
85 | ehci->regs = hcd->regs + | |
c430131a | 86 | HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); |
22ced687 A |
87 | dbg_hcs_params(ehci, "reset"); |
88 | dbg_hcc_params(ehci, "reset"); | |
89 | ||
90 | /* cache this readonly data; minimize chip reads */ | |
91 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); | |
92 | hcd->has_tt = 1; | |
93 | ||
94 | retval = ehci_halt(ehci); | |
95 | if (retval) | |
96 | return retval; | |
97 | ||
98 | ehci_reset(ehci); | |
99 | ||
100 | /* data structure init */ | |
101 | retval = ehci_init(hcd); | |
102 | if (retval) | |
103 | return retval; | |
104 | ||
105 | usb_hcd_tdi_set_mode(ehci); | |
106 | ehci_port_power(ehci, 0); | |
107 | ||
108 | return retval; | |
109 | } | |
110 | ||
111 | ||
112 | /* configure so an HC device and id are always provided | |
113 | * always called with process context; sleeping is OK | |
114 | */ | |
115 | ||
116 | static int usb_hcd_msp_map_regs(struct mspusb_device *dev) | |
117 | { | |
118 | struct resource *res; | |
119 | struct platform_device *pdev = &dev->dev; | |
120 | u32 res_len; | |
121 | int retval; | |
122 | ||
123 | /* MAB register space */ | |
124 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
125 | if (res == NULL) | |
126 | return -ENOMEM; | |
28f65c11 | 127 | res_len = resource_size(res); |
22ced687 A |
128 | if (!request_mem_region(res->start, res_len, "mab regs")) |
129 | return -EBUSY; | |
130 | ||
131 | dev->mab_regs = ioremap_nocache(res->start, res_len); | |
132 | if (dev->mab_regs == NULL) { | |
133 | retval = -ENOMEM; | |
134 | goto err1; | |
135 | } | |
136 | ||
137 | /* MSP USB register space */ | |
138 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
139 | if (res == NULL) { | |
140 | retval = -ENOMEM; | |
141 | goto err2; | |
142 | } | |
28f65c11 | 143 | res_len = resource_size(res); |
22ced687 A |
144 | if (!request_mem_region(res->start, res_len, "usbid regs")) { |
145 | retval = -EBUSY; | |
146 | goto err2; | |
147 | } | |
148 | dev->usbid_regs = ioremap_nocache(res->start, res_len); | |
149 | if (dev->usbid_regs == NULL) { | |
150 | retval = -ENOMEM; | |
151 | goto err3; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | err3: | |
156 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); | |
28f65c11 | 157 | res_len = resource_size(res); |
22ced687 A |
158 | release_mem_region(res->start, res_len); |
159 | err2: | |
160 | iounmap(dev->mab_regs); | |
161 | err1: | |
162 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
28f65c11 | 163 | res_len = resource_size(res); |
22ced687 A |
164 | release_mem_region(res->start, res_len); |
165 | dev_err(&pdev->dev, "Failed to map non-EHCI regs.\n"); | |
166 | return retval; | |
167 | } | |
168 | ||
169 | /** | |
170 | * usb_hcd_msp_probe - initialize PMC MSP-based HCDs | |
171 | * Context: !in_interrupt() | |
172 | * | |
173 | * Allocates basic resources for this USB host controller, and | |
174 | * then invokes the start() method for the HCD associated with it | |
175 | * through the hotplug entry's driver_data. | |
176 | * | |
177 | */ | |
178 | int usb_hcd_msp_probe(const struct hc_driver *driver, | |
179 | struct platform_device *dev) | |
180 | { | |
181 | int retval; | |
182 | struct usb_hcd *hcd; | |
183 | struct resource *res; | |
184 | struct ehci_hcd *ehci ; | |
185 | ||
186 | hcd = usb_create_hcd(driver, &dev->dev, "pmcmsp"); | |
187 | if (!hcd) | |
188 | return -ENOMEM; | |
189 | ||
190 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
191 | if (res == NULL) { | |
192 | pr_debug("No IOMEM resource info for %s.\n", dev->name); | |
193 | retval = -ENOMEM; | |
194 | goto err1; | |
195 | } | |
196 | hcd->rsrc_start = res->start; | |
28f65c11 | 197 | hcd->rsrc_len = resource_size(res); |
22ced687 A |
198 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, dev->name)) { |
199 | retval = -EBUSY; | |
200 | goto err1; | |
201 | } | |
202 | hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); | |
203 | if (!hcd->regs) { | |
204 | pr_debug("ioremap failed"); | |
205 | retval = -ENOMEM; | |
206 | goto err2; | |
207 | } | |
208 | ||
209 | res = platform_get_resource(dev, IORESOURCE_IRQ, 0); | |
210 | if (res == NULL) { | |
211 | dev_err(&dev->dev, "No IRQ resource info for %s.\n", dev->name); | |
212 | retval = -ENOMEM; | |
213 | goto err3; | |
214 | } | |
215 | ||
216 | /* Map non-EHCI register spaces */ | |
217 | retval = usb_hcd_msp_map_regs(to_mspusb_device(dev)); | |
218 | if (retval != 0) | |
219 | goto err3; | |
220 | ||
221 | ehci = hcd_to_ehci(hcd); | |
222 | ehci->big_endian_mmio = 1; | |
223 | ehci->big_endian_desc = 1; | |
224 | ||
225 | ||
226 | retval = usb_add_hcd(hcd, res->start, IRQF_SHARED); | |
227 | if (retval == 0) | |
228 | return 0; | |
229 | ||
230 | usb_remove_hcd(hcd); | |
231 | err3: | |
232 | iounmap(hcd->regs); | |
233 | err2: | |
234 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
235 | err1: | |
236 | usb_put_hcd(hcd); | |
237 | ||
238 | return retval; | |
239 | } | |
240 | ||
241 | ||
242 | ||
243 | /** | |
244 | * usb_hcd_msp_remove - shutdown processing for PMC MSP-based HCDs | |
245 | * @dev: USB Host Controller being removed | |
246 | * Context: !in_interrupt() | |
247 | * | |
248 | * Reverses the effect of usb_hcd_msp_probe(), first invoking | |
249 | * the HCD's stop() method. It is always called from a thread | |
250 | * context, normally "rmmod", "apmd", or something similar. | |
251 | * | |
252 | * may be called without controller electrically present | |
253 | * may be called with controller, bus, and devices active | |
254 | */ | |
255 | void usb_hcd_msp_remove(struct usb_hcd *hcd, struct platform_device *dev) | |
256 | { | |
257 | usb_remove_hcd(hcd); | |
258 | iounmap(hcd->regs); | |
259 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
260 | usb_put_hcd(hcd); | |
261 | } | |
262 | ||
263 | #ifdef CONFIG_MSP_HAS_DUAL_USB | |
264 | /* | |
265 | * Wrapper around the main ehci_irq. Since both USB host controllers are | |
266 | * sharing the same IRQ, need to first determine whether we're the intended | |
267 | * recipient of this interrupt. | |
268 | */ | |
269 | static irqreturn_t ehci_msp_irq(struct usb_hcd *hcd) | |
270 | { | |
271 | u32 int_src; | |
272 | struct device *dev = hcd->self.controller; | |
273 | struct platform_device *pdev; | |
274 | struct mspusb_device *mdev; | |
275 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
276 | /* need to reverse-map a couple of containers to get our device */ | |
277 | pdev = to_platform_device(dev); | |
278 | mdev = to_mspusb_device(pdev); | |
279 | ||
280 | /* Check to see if this interrupt is for this host controller */ | |
281 | int_src = ehci_readl(ehci, &mdev->mab_regs->int_stat); | |
282 | if (int_src & (1 << pdev->id)) | |
283 | return ehci_irq(hcd); | |
284 | ||
285 | /* Not for this device */ | |
286 | return IRQ_NONE; | |
287 | } | |
288 | #endif /* DUAL_USB */ | |
289 | ||
290 | static const struct hc_driver ehci_msp_hc_driver = { | |
291 | .description = hcd_name, | |
292 | .product_desc = "PMC MSP EHCI", | |
293 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
294 | ||
295 | /* | |
296 | * generic hardware linkage | |
297 | */ | |
298 | #ifdef CONFIG_MSP_HAS_DUAL_USB | |
299 | .irq = ehci_msp_irq, | |
300 | #else | |
301 | .irq = ehci_irq, | |
302 | #endif | |
303 | .flags = HCD_MEMORY | HCD_USB2, | |
304 | ||
305 | /* | |
306 | * basic lifecycle operations | |
307 | */ | |
308 | .reset = ehci_msp_setup, | |
309 | .start = ehci_run, | |
310 | .shutdown = ehci_shutdown, | |
311 | .start = ehci_run, | |
312 | .stop = ehci_stop, | |
313 | ||
314 | /* | |
315 | * managing i/o requests and associated device resources | |
316 | */ | |
317 | .urb_enqueue = ehci_urb_enqueue, | |
318 | .urb_dequeue = ehci_urb_dequeue, | |
319 | .endpoint_disable = ehci_endpoint_disable, | |
320 | .endpoint_reset = ehci_endpoint_reset, | |
321 | ||
322 | /* | |
323 | * scheduling support | |
324 | */ | |
325 | .get_frame_number = ehci_get_frame, | |
326 | ||
327 | /* | |
328 | * root hub support | |
329 | */ | |
330 | .hub_status_data = ehci_hub_status_data, | |
331 | .hub_control = ehci_hub_control, | |
332 | .bus_suspend = ehci_bus_suspend, | |
333 | .bus_resume = ehci_bus_resume, | |
334 | .relinquish_port = ehci_relinquish_port, | |
335 | .port_handed_over = ehci_port_handed_over, | |
336 | ||
337 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
338 | }; | |
339 | ||
340 | static int ehci_hcd_msp_drv_probe(struct platform_device *pdev) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | pr_debug("In ehci_hcd_msp_drv_probe"); | |
345 | ||
346 | if (usb_disabled()) | |
347 | return -ENODEV; | |
348 | ||
349 | gpio_request(MSP_PIN_USB0_HOST_DEV, "USB0_HOST_DEV_GPIO"); | |
350 | #ifdef CONFIG_MSP_HAS_DUAL_USB | |
351 | gpio_request(MSP_PIN_USB1_HOST_DEV, "USB1_HOST_DEV_GPIO"); | |
352 | #endif | |
353 | ||
354 | ret = usb_hcd_msp_probe(&ehci_msp_hc_driver, pdev); | |
355 | ||
356 | return ret; | |
357 | } | |
358 | ||
359 | static int ehci_hcd_msp_drv_remove(struct platform_device *pdev) | |
360 | { | |
361 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
362 | ||
363 | usb_hcd_msp_remove(hcd, pdev); | |
364 | ||
365 | /* free TWI GPIO USB_HOST_DEV pin */ | |
366 | gpio_free(MSP_PIN_USB0_HOST_DEV); | |
367 | #ifdef CONFIG_MSP_HAS_DUAL_USB | |
368 | gpio_free(MSP_PIN_USB1_HOST_DEV); | |
369 | #endif | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | MODULE_ALIAS("pmcmsp-ehci"); | |
375 | ||
376 | static struct platform_driver ehci_hcd_msp_driver = { | |
377 | .probe = ehci_hcd_msp_drv_probe, | |
378 | .remove = ehci_hcd_msp_drv_remove, | |
379 | .driver = { | |
380 | .name = "pmcmsp-ehci", | |
381 | .owner = THIS_MODULE, | |
382 | }, | |
383 | }; |