1 /*
2  * Copyright (c) 2012 Qualcomm Atheros, Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/sched.h>
20 #include <linux/ieee80211.h>
21 #include <linux/wireless.h>
22 #include <linux/slab.h>
23 #include <linux/moduleparam.h>
24 #include <linux/if_arp.h>
25 
26 #include "wil6210.h"
27 
28 /*
29  * Due to a hardware issue,
30  * one has to read/write to/from NIC in 32-bit chunks;
31  * regular memcpy_fromio and siblings will
32  * not work on 64-bit platform - it uses 64-bit transactions
33  *
34  * Force 32-bit transactions to enable NIC on 64-bit platforms
35  *
36  * To avoid byte swap on big endian host, __raw_{read|write}l
37  * should be used - {read|write}l would swap bytes to provide
38  * little endian on PCI value in host endianness.
39  */
40 void wil_memcpy_fromio_32(void *dst, const volatile void __iomem *src,
41 			  size_t count)
42 {
43 	u32 *d = dst;
44 	const volatile u32 __iomem *s = src;
45 
46 	/* size_t is unsigned, if (count%4 != 0) it will wrap */
47 	for (count += 4; count > 4; count -= 4)
48 		*d++ = __raw_readl(s++);
49 }
50 
51 void wil_memcpy_toio_32(volatile void __iomem *dst, const void *src,
52 			size_t count)
53 {
54 	volatile u32 __iomem *d = dst;
55 	const u32 *s = src;
56 
57 	for (count += 4; count > 4; count -= 4)
58 		__raw_writel(*s++, d++);
59 }
60 
61 static void _wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
62 {
63 	uint i;
64 	struct net_device *ndev = wil_to_ndev(wil);
65 	struct wireless_dev *wdev = wil->wdev;
66 
67 	wil_dbg(wil, "%s()\n", __func__);
68 
69 	wil_link_off(wil);
70 	clear_bit(wil_status_fwconnected, &wil->status);
71 
72 	switch (wdev->sme_state) {
73 	case CFG80211_SME_CONNECTED:
74 		cfg80211_disconnected(ndev, WLAN_STATUS_UNSPECIFIED_FAILURE,
75 				      NULL, 0, GFP_KERNEL);
76 		break;
77 	case CFG80211_SME_CONNECTING:
78 		cfg80211_connect_result(ndev, bssid, NULL, 0, NULL, 0,
79 					WLAN_STATUS_UNSPECIFIED_FAILURE,
80 					GFP_KERNEL);
81 		break;
82 	default:
83 		;
84 	}
85 
86 	for (i = 0; i < ARRAY_SIZE(wil->vring_tx); i++)
87 		wil_vring_fini_tx(wil, i);
88 }
89 
90 static void wil_disconnect_worker(struct work_struct *work)
91 {
92 	struct wil6210_priv *wil = container_of(work,
93 			struct wil6210_priv, disconnect_worker);
94 
95 	_wil6210_disconnect(wil, NULL);
96 }
97 
98 static void wil_connect_timer_fn(ulong x)
99 {
100 	struct wil6210_priv *wil = (void *)x;
101 
102 	wil_dbg(wil, "Connect timeout\n");
103 
104 	/* reschedule to thread context - disconnect won't
105 	 * run from atomic context
106 	 */
107 	schedule_work(&wil->disconnect_worker);
108 }
109 
110 int wil_priv_init(struct wil6210_priv *wil)
111 {
112 	wil_dbg(wil, "%s()\n", __func__);
113 
114 	mutex_init(&wil->mutex);
115 	mutex_init(&wil->wmi_mutex);
116 
117 	init_completion(&wil->wmi_ready);
118 
119 	wil->pending_connect_cid = -1;
120 	setup_timer(&wil->connect_timer, wil_connect_timer_fn, (ulong)wil);
121 
122 	INIT_WORK(&wil->wmi_connect_worker, wmi_connect_worker);
123 	INIT_WORK(&wil->disconnect_worker, wil_disconnect_worker);
124 	INIT_WORK(&wil->wmi_event_worker, wmi_event_worker);
125 
126 	INIT_LIST_HEAD(&wil->pending_wmi_ev);
127 	spin_lock_init(&wil->wmi_ev_lock);
128 
129 	wil->wmi_wq = create_singlethread_workqueue(WIL_NAME"_wmi");
130 	if (!wil->wmi_wq)
131 		return -EAGAIN;
132 
133 	wil->wmi_wq_conn = create_singlethread_workqueue(WIL_NAME"_connect");
134 	if (!wil->wmi_wq_conn) {
135 		destroy_workqueue(wil->wmi_wq);
136 		return -EAGAIN;
137 	}
138 
139 	/* make shadow copy of registers that should not change on run time */
140 	wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
141 			     sizeof(struct wil6210_mbox_ctl));
142 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
143 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
144 
145 	return 0;
146 }
147 
148 void wil6210_disconnect(struct wil6210_priv *wil, void *bssid)
149 {
150 	del_timer_sync(&wil->connect_timer);
151 	_wil6210_disconnect(wil, bssid);
152 }
153 
154 void wil_priv_deinit(struct wil6210_priv *wil)
155 {
156 	cancel_work_sync(&wil->disconnect_worker);
157 	wil6210_disconnect(wil, NULL);
158 	wmi_event_flush(wil);
159 	destroy_workqueue(wil->wmi_wq_conn);
160 	destroy_workqueue(wil->wmi_wq);
161 }
162 
163 static void wil_target_reset(struct wil6210_priv *wil)
164 {
165 	wil_dbg(wil, "Resetting...\n");
166 
167 	/* register write */
168 #define W(a, v) iowrite32(v, wil->csr + HOSTADDR(a))
169 	/* register set = read, OR, write */
170 #define S(a, v) iowrite32(ioread32(wil->csr + HOSTADDR(a)) | v, \
171 		wil->csr + HOSTADDR(a))
172 
173 	/* hpal_perst_from_pad_src_n_mask */
174 	S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(6));
175 	/* car_perst_rst_src_n_mask */
176 	S(RGF_USER_CLKS_CTL_SW_RST_MASK_0, BIT(7));
177 
178 	W(RGF_USER_MAC_CPU_0,  BIT(1)); /* mac_cpu_man_rst */
179 	W(RGF_USER_USER_CPU_0, BIT(1)); /* user_cpu_man_rst */
180 
181 	msleep(100);
182 
183 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0xFE000000);
184 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0x0000003F);
185 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000170);
186 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0xFFE7FC00);
187 
188 	msleep(100);
189 
190 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0);
191 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0);
192 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_1, 0);
193 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
194 
195 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_3, 0x00000001);
196 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_2, 0x00000080);
197 	W(RGF_USER_CLKS_CTL_SW_RST_VEC_0, 0);
198 
199 	msleep(2000);
200 
201 	W(RGF_USER_USER_CPU_0, BIT(0)); /* user_cpu_man_de_rst */
202 
203 	msleep(2000);
204 
205 	wil_dbg(wil, "Reset completed\n");
206 
207 #undef W
208 #undef S
209 }
210 
211 void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r)
212 {
213 	le32_to_cpus(&r->base);
214 	le16_to_cpus(&r->entry_size);
215 	le16_to_cpus(&r->size);
216 	le32_to_cpus(&r->tail);
217 	le32_to_cpus(&r->head);
218 }
219 
220 static int wil_wait_for_fw_ready(struct wil6210_priv *wil)
221 {
222 	ulong to = msecs_to_jiffies(1000);
223 	ulong left = wait_for_completion_timeout(&wil->wmi_ready, to);
224 	if (0 == left) {
225 		wil_err(wil, "Firmware not ready\n");
226 		return -ETIME;
227 	} else {
228 		wil_dbg(wil, "FW ready after %d ms\n",
229 			jiffies_to_msecs(to-left));
230 	}
231 	return 0;
232 }
233 
234 /*
235  * We reset all the structures, and we reset the UMAC.
236  * After calling this routine, you're expected to reload
237  * the firmware.
238  */
239 int wil_reset(struct wil6210_priv *wil)
240 {
241 	int rc;
242 
243 	cancel_work_sync(&wil->disconnect_worker);
244 	wil6210_disconnect(wil, NULL);
245 
246 	wmi_event_flush(wil);
247 
248 	flush_workqueue(wil->wmi_wq);
249 	flush_workqueue(wil->wmi_wq_conn);
250 
251 	wil6210_disable_irq(wil);
252 	wil->status = 0;
253 
254 	/* TODO: put MAC in reset */
255 	wil_target_reset(wil);
256 
257 	/* init after reset */
258 	wil->pending_connect_cid = -1;
259 	INIT_COMPLETION(wil->wmi_ready);
260 
261 	/* make shadow copy of registers that should not change on run time */
262 	wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX,
263 			     sizeof(struct wil6210_mbox_ctl));
264 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx);
265 	wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx);
266 
267 	/* TODO: release MAC reset */
268 	wil6210_enable_irq(wil);
269 
270 	/* we just started MAC, wait for FW ready */
271 	rc = wil_wait_for_fw_ready(wil);
272 
273 	return rc;
274 }
275 
276 
277 void wil_link_on(struct wil6210_priv *wil)
278 {
279 	struct net_device *ndev = wil_to_ndev(wil);
280 
281 	wil_dbg(wil, "%s()\n", __func__);
282 
283 	netif_carrier_on(ndev);
284 	netif_tx_wake_all_queues(ndev);
285 }
286 
287 void wil_link_off(struct wil6210_priv *wil)
288 {
289 	struct net_device *ndev = wil_to_ndev(wil);
290 
291 	wil_dbg(wil, "%s()\n", __func__);
292 
293 	netif_tx_stop_all_queues(ndev);
294 	netif_carrier_off(ndev);
295 }
296 
297 static int __wil_up(struct wil6210_priv *wil)
298 {
299 	struct net_device *ndev = wil_to_ndev(wil);
300 	struct wireless_dev *wdev = wil->wdev;
301 	struct ieee80211_channel *channel = wdev->preset_chandef.chan;
302 	int rc;
303 	int bi;
304 	u16 wmi_nettype = wil_iftype_nl2wmi(wdev->iftype);
305 
306 	rc = wil_reset(wil);
307 	if (rc)
308 		return rc;
309 
310 	/* FIXME Firmware works now in PBSS mode(ToDS=0, FromDS=0) */
311 	wmi_nettype = wil_iftype_nl2wmi(NL80211_IFTYPE_ADHOC);
312 	switch (wdev->iftype) {
313 	case NL80211_IFTYPE_STATION:
314 		wil_dbg(wil, "type: STATION\n");
315 		bi = 0;
316 		ndev->type = ARPHRD_ETHER;
317 		break;
318 	case NL80211_IFTYPE_AP:
319 		wil_dbg(wil, "type: AP\n");
320 		bi = 100;
321 		ndev->type = ARPHRD_ETHER;
322 		break;
323 	case NL80211_IFTYPE_P2P_CLIENT:
324 		wil_dbg(wil, "type: P2P_CLIENT\n");
325 		bi = 0;
326 		ndev->type = ARPHRD_ETHER;
327 		break;
328 	case NL80211_IFTYPE_P2P_GO:
329 		wil_dbg(wil, "type: P2P_GO\n");
330 		bi = 100;
331 		ndev->type = ARPHRD_ETHER;
332 		break;
333 	case NL80211_IFTYPE_MONITOR:
334 		wil_dbg(wil, "type: Monitor\n");
335 		bi = 0;
336 		ndev->type = ARPHRD_IEEE80211_RADIOTAP;
337 		/* ARPHRD_IEEE80211 or ARPHRD_IEEE80211_RADIOTAP ? */
338 		break;
339 	default:
340 		return -EOPNOTSUPP;
341 	}
342 
343 	/* Apply profile in the following order: */
344 	/* SSID and channel for the AP */
345 	switch (wdev->iftype) {
346 	case NL80211_IFTYPE_AP:
347 	case NL80211_IFTYPE_P2P_GO:
348 		if (wdev->ssid_len == 0) {
349 			wil_err(wil, "SSID not set\n");
350 			return -EINVAL;
351 		}
352 		wmi_set_ssid(wil, wdev->ssid_len, wdev->ssid);
353 		if (channel)
354 			wmi_set_channel(wil, channel->hw_value);
355 		break;
356 	default:
357 		;
358 	}
359 
360 	/* MAC address - pre-requisite for other commands */
361 	wmi_set_mac_address(wil, ndev->dev_addr);
362 
363 	/* Set up beaconing if required. */
364 	rc = wmi_set_bcon(wil, bi, wmi_nettype);
365 	if (rc)
366 		return rc;
367 
368 	/* Rx VRING. After MAC and beacon */
369 	wil_rx_init(wil);
370 
371 	return 0;
372 }
373 
374 int wil_up(struct wil6210_priv *wil)
375 {
376 	int rc;
377 
378 	mutex_lock(&wil->mutex);
379 	rc = __wil_up(wil);
380 	mutex_unlock(&wil->mutex);
381 
382 	return rc;
383 }
384 
385 static int __wil_down(struct wil6210_priv *wil)
386 {
387 	if (wil->scan_request) {
388 		cfg80211_scan_done(wil->scan_request, true);
389 		wil->scan_request = NULL;
390 	}
391 
392 	wil6210_disconnect(wil, NULL);
393 	wil_rx_fini(wil);
394 
395 	return 0;
396 }
397 
398 int wil_down(struct wil6210_priv *wil)
399 {
400 	int rc;
401 
402 	mutex_lock(&wil->mutex);
403 	rc = __wil_down(wil);
404 	mutex_unlock(&wil->mutex);
405 
406 	return rc;
407 }
408