1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
4  */
5 
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/usb.h>
9 
10 #include "mt7601u.h"
11 #include "usb.h"
12 #include "trace.h"
13 
14 static const struct usb_device_id mt7601u_device_table[] = {
15 	{ USB_DEVICE(0x0b05, 0x17d3) },
16 	{ USB_DEVICE(0x0e8d, 0x760a) },
17 	{ USB_DEVICE(0x0e8d, 0x760b) },
18 	{ USB_DEVICE(0x13d3, 0x3431) },
19 	{ USB_DEVICE(0x13d3, 0x3434) },
20 	{ USB_DEVICE(0x148f, 0x7601) },
21 	{ USB_DEVICE(0x148f, 0x760a) },
22 	{ USB_DEVICE(0x148f, 0x760b) },
23 	{ USB_DEVICE(0x148f, 0x760c) },
24 	{ USB_DEVICE(0x148f, 0x760d) },
25 	{ USB_DEVICE(0x2001, 0x3d04) },
26 	{ USB_DEVICE(0x2717, 0x4106) },
27 	{ USB_DEVICE(0x2955, 0x0001) },
28 	{ USB_DEVICE(0x2955, 0x1001) },
29 	{ USB_DEVICE(0x2a5f, 0x1000) },
30 	{ USB_DEVICE(0x7392, 0x7710) },
31 	{ 0, }
32 };
33 
34 bool mt7601u_usb_alloc_buf(struct mt7601u_dev *dev, size_t len,
35 			   struct mt7601u_dma_buf *buf)
36 {
37 	struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
38 
39 	buf->len = len;
40 	buf->urb = usb_alloc_urb(0, GFP_KERNEL);
41 	buf->buf = usb_alloc_coherent(usb_dev, buf->len, GFP_KERNEL, &buf->dma);
42 
43 	return !buf->urb || !buf->buf;
44 }
45 
46 void mt7601u_usb_free_buf(struct mt7601u_dev *dev, struct mt7601u_dma_buf *buf)
47 {
48 	struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
49 
50 	usb_free_coherent(usb_dev, buf->len, buf->buf, buf->dma);
51 	usb_free_urb(buf->urb);
52 }
53 
54 int mt7601u_usb_submit_buf(struct mt7601u_dev *dev, int dir, int ep_idx,
55 			   struct mt7601u_dma_buf *buf, gfp_t gfp,
56 			   usb_complete_t complete_fn, void *context)
57 {
58 	struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
59 	unsigned pipe;
60 	int ret;
61 
62 	if (dir == USB_DIR_IN)
63 		pipe = usb_rcvbulkpipe(usb_dev, dev->in_eps[ep_idx]);
64 	else
65 		pipe = usb_sndbulkpipe(usb_dev, dev->out_eps[ep_idx]);
66 
67 	usb_fill_bulk_urb(buf->urb, usb_dev, pipe, buf->buf, buf->len,
68 			  complete_fn, context);
69 	buf->urb->transfer_dma = buf->dma;
70 	buf->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
71 
72 	trace_mt_submit_urb(dev, buf->urb);
73 	ret = usb_submit_urb(buf->urb, gfp);
74 	if (ret)
75 		dev_err(dev->dev, "Error: submit URB dir:%d ep:%d failed:%d\n",
76 			dir, ep_idx, ret);
77 	return ret;
78 }
79 
80 void mt7601u_complete_urb(struct urb *urb)
81 {
82 	struct completion *cmpl = urb->context;
83 
84 	complete(cmpl);
85 }
86 
87 int mt7601u_vendor_request(struct mt7601u_dev *dev, const u8 req,
88 			   const u8 direction, const u16 val, const u16 offset,
89 			   void *buf, const size_t buflen)
90 {
91 	int i, ret;
92 	struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
93 	const u8 req_type = direction | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
94 	const unsigned int pipe = (direction == USB_DIR_IN) ?
95 		usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
96 
97 	for (i = 0; i < MT_VEND_REQ_MAX_RETRY; i++) {
98 		ret = usb_control_msg(usb_dev, pipe, req, req_type,
99 				      val, offset, buf, buflen,
100 				      MT_VEND_REQ_TOUT_MS);
101 		trace_mt_vend_req(dev, pipe, req, req_type, val, offset,
102 				  buf, buflen, ret);
103 
104 		if (ret == -ENODEV)
105 			set_bit(MT7601U_STATE_REMOVED, &dev->state);
106 		if (ret >= 0 || ret == -ENODEV)
107 			return ret;
108 
109 		msleep(5);
110 	}
111 
112 	dev_err(dev->dev, "Vendor request req:%02x off:%04x failed:%d\n",
113 		req, offset, ret);
114 
115 	return ret;
116 }
117 
118 void mt7601u_vendor_reset(struct mt7601u_dev *dev)
119 {
120 	mt7601u_vendor_request(dev, MT_VEND_DEV_MODE, USB_DIR_OUT,
121 			       MT_VEND_DEV_MODE_RESET, 0, NULL, 0);
122 }
123 
124 /* should be called with vendor_req_mutex held */
125 static u32 __mt7601u_rr(struct mt7601u_dev *dev, u32 offset)
126 {
127 	int ret;
128 	u32 val = ~0;
129 
130 	WARN_ONCE(offset > USHRT_MAX, "read high off:%08x", offset);
131 
132 	ret = mt7601u_vendor_request(dev, MT_VEND_MULTI_READ, USB_DIR_IN,
133 				     0, offset, dev->vend_buf, MT_VEND_BUF);
134 	if (ret == MT_VEND_BUF)
135 		val = get_unaligned_le32(dev->vend_buf);
136 	else if (ret > 0)
137 		dev_err(dev->dev, "Error: wrong size read:%d off:%08x\n",
138 			ret, offset);
139 
140 	trace_reg_read(dev, offset, val);
141 	return val;
142 }
143 
144 u32 mt7601u_rr(struct mt7601u_dev *dev, u32 offset)
145 {
146 	u32 ret;
147 
148 	mutex_lock(&dev->vendor_req_mutex);
149 	ret = __mt7601u_rr(dev, offset);
150 	mutex_unlock(&dev->vendor_req_mutex);
151 
152 	return ret;
153 }
154 
155 /* should be called with vendor_req_mutex held */
156 static int __mt7601u_vendor_single_wr(struct mt7601u_dev *dev, const u8 req,
157 				      const u16 offset, const u32 val)
158 {
159 	int ret = mt7601u_vendor_request(dev, req, USB_DIR_OUT,
160 					 val & 0xffff, offset, NULL, 0);
161 	if (!ret)
162 		ret = mt7601u_vendor_request(dev, req, USB_DIR_OUT,
163 					     val >> 16, offset + 2, NULL, 0);
164 	trace_reg_write(dev, offset, val);
165 	return ret;
166 }
167 
168 int mt7601u_vendor_single_wr(struct mt7601u_dev *dev, const u8 req,
169 			     const u16 offset, const u32 val)
170 {
171 	int ret;
172 
173 	mutex_lock(&dev->vendor_req_mutex);
174 	ret = __mt7601u_vendor_single_wr(dev, req, offset, val);
175 	mutex_unlock(&dev->vendor_req_mutex);
176 
177 	return ret;
178 }
179 
180 void mt7601u_wr(struct mt7601u_dev *dev, u32 offset, u32 val)
181 {
182 	WARN_ONCE(offset > USHRT_MAX, "write high off:%08x", offset);
183 
184 	mt7601u_vendor_single_wr(dev, MT_VEND_WRITE, offset, val);
185 }
186 
187 u32 mt7601u_rmw(struct mt7601u_dev *dev, u32 offset, u32 mask, u32 val)
188 {
189 	mutex_lock(&dev->vendor_req_mutex);
190 	val |= __mt7601u_rr(dev, offset) & ~mask;
191 	__mt7601u_vendor_single_wr(dev, MT_VEND_WRITE, offset, val);
192 	mutex_unlock(&dev->vendor_req_mutex);
193 
194 	return val;
195 }
196 
197 u32 mt7601u_rmc(struct mt7601u_dev *dev, u32 offset, u32 mask, u32 val)
198 {
199 	u32 reg;
200 
201 	mutex_lock(&dev->vendor_req_mutex);
202 	reg = __mt7601u_rr(dev, offset);
203 	val |= reg & ~mask;
204 	if (reg != val)
205 		__mt7601u_vendor_single_wr(dev, MT_VEND_WRITE,
206 					   offset, val);
207 	mutex_unlock(&dev->vendor_req_mutex);
208 
209 	return val;
210 }
211 
212 void mt7601u_wr_copy(struct mt7601u_dev *dev, u32 offset,
213 		     const void *data, int len)
214 {
215 	WARN_ONCE(offset & 3, "unaligned write copy off:%08x", offset);
216 	WARN_ONCE(len & 3, "short write copy off:%08x", offset);
217 
218 	mt7601u_burst_write_regs(dev, offset, data, len / 4);
219 }
220 
221 void mt7601u_addr_wr(struct mt7601u_dev *dev, const u32 offset, const u8 *addr)
222 {
223 	mt7601u_wr(dev, offset, get_unaligned_le32(addr));
224 	mt7601u_wr(dev, offset + 4, addr[4] | addr[5] << 8);
225 }
226 
227 static int mt7601u_assign_pipes(struct usb_interface *usb_intf,
228 				struct mt7601u_dev *dev)
229 {
230 	struct usb_endpoint_descriptor *ep_desc;
231 	struct usb_host_interface *intf_desc = usb_intf->cur_altsetting;
232 	unsigned i, ep_i = 0, ep_o = 0;
233 
234 	BUILD_BUG_ON(sizeof(dev->in_eps) < __MT_EP_IN_MAX);
235 	BUILD_BUG_ON(sizeof(dev->out_eps) < __MT_EP_OUT_MAX);
236 
237 	for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
238 		ep_desc = &intf_desc->endpoint[i].desc;
239 
240 		if (usb_endpoint_is_bulk_in(ep_desc) &&
241 		    ep_i++ < __MT_EP_IN_MAX) {
242 			dev->in_eps[ep_i - 1] = usb_endpoint_num(ep_desc);
243 			dev->in_max_packet = usb_endpoint_maxp(ep_desc);
244 			/* Note: this is ignored by usb sub-system but vendor
245 			 *	 code does it. We can drop this at some point.
246 			 */
247 			dev->in_eps[ep_i - 1] |= USB_DIR_IN;
248 		} else if (usb_endpoint_is_bulk_out(ep_desc) &&
249 			   ep_o++ < __MT_EP_OUT_MAX) {
250 			dev->out_eps[ep_o - 1] = usb_endpoint_num(ep_desc);
251 			dev->out_max_packet = usb_endpoint_maxp(ep_desc);
252 		}
253 	}
254 
255 	if (ep_i != __MT_EP_IN_MAX || ep_o != __MT_EP_OUT_MAX) {
256 		dev_err(dev->dev, "Error: wrong pipe number in:%d out:%d\n",
257 			ep_i, ep_o);
258 		return -EINVAL;
259 	}
260 
261 	return 0;
262 }
263 
264 static int mt7601u_probe(struct usb_interface *usb_intf,
265 			 const struct usb_device_id *id)
266 {
267 	struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
268 	struct mt7601u_dev *dev;
269 	u32 asic_rev, mac_rev;
270 	int ret;
271 
272 	dev = mt7601u_alloc_device(&usb_intf->dev);
273 	if (!dev)
274 		return -ENOMEM;
275 
276 	usb_dev = usb_get_dev(usb_dev);
277 	usb_reset_device(usb_dev);
278 
279 	usb_set_intfdata(usb_intf, dev);
280 
281 	dev->vend_buf = devm_kmalloc(dev->dev, MT_VEND_BUF, GFP_KERNEL);
282 	if (!dev->vend_buf) {
283 		ret = -ENOMEM;
284 		goto err;
285 	}
286 
287 	ret = mt7601u_assign_pipes(usb_intf, dev);
288 	if (ret)
289 		goto err;
290 	ret = mt7601u_wait_asic_ready(dev);
291 	if (ret)
292 		goto err;
293 
294 	asic_rev = mt7601u_rr(dev, MT_ASIC_VERSION);
295 	mac_rev = mt7601u_rr(dev, MT_MAC_CSR0);
296 	dev_info(dev->dev, "ASIC revision: %08x MAC revision: %08x\n",
297 		 asic_rev, mac_rev);
298 	if ((asic_rev >> 16) != 0x7601) {
299 		ret = -ENODEV;
300 		goto err;
301 	}
302 
303 	/* Note: vendor driver skips this check for MT7601U */
304 	if (!(mt7601u_rr(dev, MT_EFUSE_CTRL) & MT_EFUSE_CTRL_SEL))
305 		dev_warn(dev->dev, "Warning: eFUSE not present\n");
306 
307 	ret = mt7601u_init_hardware(dev);
308 	if (ret)
309 		goto err;
310 	ret = mt7601u_register_device(dev);
311 	if (ret)
312 		goto err_hw;
313 
314 	set_bit(MT7601U_STATE_INITIALIZED, &dev->state);
315 
316 	return 0;
317 err_hw:
318 	mt7601u_cleanup(dev);
319 err:
320 	usb_set_intfdata(usb_intf, NULL);
321 	usb_put_dev(interface_to_usbdev(usb_intf));
322 
323 	destroy_workqueue(dev->stat_wq);
324 	ieee80211_free_hw(dev->hw);
325 	return ret;
326 }
327 
328 static void mt7601u_disconnect(struct usb_interface *usb_intf)
329 {
330 	struct mt7601u_dev *dev = usb_get_intfdata(usb_intf);
331 
332 	ieee80211_unregister_hw(dev->hw);
333 	mt7601u_cleanup(dev);
334 
335 	usb_set_intfdata(usb_intf, NULL);
336 	usb_put_dev(interface_to_usbdev(usb_intf));
337 
338 	destroy_workqueue(dev->stat_wq);
339 	ieee80211_free_hw(dev->hw);
340 }
341 
342 static int mt7601u_suspend(struct usb_interface *usb_intf, pm_message_t state)
343 {
344 	struct mt7601u_dev *dev = usb_get_intfdata(usb_intf);
345 
346 	mt7601u_cleanup(dev);
347 
348 	return 0;
349 }
350 
351 static int mt7601u_resume(struct usb_interface *usb_intf)
352 {
353 	struct mt7601u_dev *dev = usb_get_intfdata(usb_intf);
354 	int ret;
355 
356 	ret = mt7601u_init_hardware(dev);
357 	if (ret)
358 		return ret;
359 
360 	set_bit(MT7601U_STATE_INITIALIZED, &dev->state);
361 
362 	return 0;
363 }
364 
365 MODULE_DEVICE_TABLE(usb, mt7601u_device_table);
366 MODULE_FIRMWARE(MT7601U_FIRMWARE);
367 MODULE_LICENSE("GPL");
368 
369 static struct usb_driver mt7601u_driver = {
370 	.name		= KBUILD_MODNAME,
371 	.id_table	= mt7601u_device_table,
372 	.probe		= mt7601u_probe,
373 	.disconnect	= mt7601u_disconnect,
374 	.suspend	= mt7601u_suspend,
375 	.resume		= mt7601u_resume,
376 	.reset_resume	= mt7601u_resume,
377 	.soft_unbind	= 1,
378 	.disable_hub_initiated_lpm = 1,
379 };
380 module_usb_driver(mt7601u_driver);
381