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afa17a50 WS |
1 | /* |
2 | * CAN bus driver for the alone generic (as possible as) MSCAN controller. | |
3 | * | |
4 | * Copyright (C) 2005-2006 Andrey Volkov <avolkov@varma-el.com>, | |
5 | * Varma Electronics Oy | |
6 | * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com> | |
2d4b6faf | 7 | * Copyright (C) 2008-2009 Pengutronix <kernel@pengutronix.de> |
afa17a50 WS |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the version 2 of the GNU General Public License | |
11 | * as published by the Free Software Foundation | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/if_arp.h> | |
29 | #include <linux/if_ether.h> | |
30 | #include <linux/list.h> | |
afa17a50 WS |
31 | #include <linux/can/dev.h> |
32 | #include <linux/can/error.h> | |
33 | #include <linux/io.h> | |
34 | ||
35 | #include "mscan.h" | |
36 | ||
afa17a50 WS |
37 | static struct can_bittiming_const mscan_bittiming_const = { |
38 | .name = "mscan", | |
39 | .tseg1_min = 4, | |
40 | .tseg1_max = 16, | |
41 | .tseg2_min = 2, | |
42 | .tseg2_max = 8, | |
43 | .sjw_max = 4, | |
44 | .brp_min = 1, | |
45 | .brp_max = 64, | |
46 | .brp_inc = 1, | |
47 | }; | |
48 | ||
49 | struct mscan_state { | |
50 | u8 mode; | |
51 | u8 canrier; | |
52 | u8 cantier; | |
53 | }; | |
54 | ||
afa17a50 WS |
55 | static enum can_state state_map[] = { |
56 | CAN_STATE_ERROR_ACTIVE, | |
57 | CAN_STATE_ERROR_WARNING, | |
58 | CAN_STATE_ERROR_PASSIVE, | |
59 | CAN_STATE_BUS_OFF | |
60 | }; | |
61 | ||
62 | static int mscan_set_mode(struct net_device *dev, u8 mode) | |
63 | { | |
64 | struct mscan_priv *priv = netdev_priv(dev); | |
65 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
66 | int ret = 0; | |
67 | int i; | |
68 | u8 canctl1; | |
69 | ||
70 | if (mode != MSCAN_NORMAL_MODE) { | |
afa17a50 WS |
71 | if (priv->tx_active) { |
72 | /* Abort transfers before going to sleep */# | |
73 | out_8(®s->cantarq, priv->tx_active); | |
74 | /* Suppress TX done interrupts */ | |
75 | out_8(®s->cantier, 0); | |
76 | } | |
77 | ||
78 | canctl1 = in_8(®s->canctl1); | |
0285e7ce | 79 | if ((mode & MSCAN_SLPRQ) && !(canctl1 & MSCAN_SLPAK)) { |
59179ea6 | 80 | setbits8(®s->canctl0, MSCAN_SLPRQ); |
afa17a50 WS |
81 | for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) { |
82 | if (in_8(®s->canctl1) & MSCAN_SLPAK) | |
83 | break; | |
84 | udelay(100); | |
85 | } | |
86 | /* | |
87 | * The mscan controller will fail to enter sleep mode, | |
88 | * while there are irregular activities on bus, like | |
89 | * somebody keeps retransmitting. This behavior is | |
90 | * undocumented and seems to differ between mscan built | |
91 | * in mpc5200b and mpc5200. We proceed in that case, | |
92 | * since otherwise the slprq will be kept set and the | |
93 | * controller will get stuck. NOTE: INITRQ or CSWAI | |
94 | * will abort all active transmit actions, if still | |
95 | * any, at once. | |
96 | */ | |
97 | if (i >= MSCAN_SET_MODE_RETRIES) | |
98 | dev_dbg(dev->dev.parent, | |
99 | "device failed to enter sleep mode. " | |
100 | "We proceed anyhow.\n"); | |
101 | else | |
102 | priv->can.state = CAN_STATE_SLEEPING; | |
103 | } | |
104 | ||
0285e7ce | 105 | if ((mode & MSCAN_INITRQ) && !(canctl1 & MSCAN_INITAK)) { |
59179ea6 | 106 | setbits8(®s->canctl0, MSCAN_INITRQ); |
afa17a50 WS |
107 | for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) { |
108 | if (in_8(®s->canctl1) & MSCAN_INITAK) | |
109 | break; | |
110 | } | |
111 | if (i >= MSCAN_SET_MODE_RETRIES) | |
112 | ret = -ENODEV; | |
113 | } | |
114 | if (!ret) | |
115 | priv->can.state = CAN_STATE_STOPPED; | |
116 | ||
117 | if (mode & MSCAN_CSWAI) | |
59179ea6 | 118 | setbits8(®s->canctl0, MSCAN_CSWAI); |
afa17a50 WS |
119 | |
120 | } else { | |
121 | canctl1 = in_8(®s->canctl1); | |
122 | if (canctl1 & (MSCAN_SLPAK | MSCAN_INITAK)) { | |
59179ea6 | 123 | clrbits8(®s->canctl0, MSCAN_SLPRQ | MSCAN_INITRQ); |
afa17a50 WS |
124 | for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) { |
125 | canctl1 = in_8(®s->canctl1); | |
126 | if (!(canctl1 & (MSCAN_INITAK | MSCAN_SLPAK))) | |
127 | break; | |
128 | } | |
129 | if (i >= MSCAN_SET_MODE_RETRIES) | |
130 | ret = -ENODEV; | |
131 | else | |
132 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
133 | } | |
134 | } | |
135 | return ret; | |
136 | } | |
137 | ||
138 | static int mscan_start(struct net_device *dev) | |
139 | { | |
140 | struct mscan_priv *priv = netdev_priv(dev); | |
141 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
142 | u8 canrflg; | |
143 | int err; | |
144 | ||
145 | out_8(®s->canrier, 0); | |
146 | ||
147 | INIT_LIST_HEAD(&priv->tx_head); | |
148 | priv->prev_buf_id = 0; | |
149 | priv->cur_pri = 0; | |
150 | priv->tx_active = 0; | |
151 | priv->shadow_canrier = 0; | |
152 | priv->flags = 0; | |
153 | ||
bf3af547 WG |
154 | if (priv->type == MSCAN_TYPE_MPC5121) { |
155 | /* Clear pending bus-off condition */ | |
156 | if (in_8(®s->canmisc) & MSCAN_BOHOLD) | |
157 | out_8(®s->canmisc, MSCAN_BOHOLD); | |
158 | } | |
159 | ||
afa17a50 WS |
160 | err = mscan_set_mode(dev, MSCAN_NORMAL_MODE); |
161 | if (err) | |
162 | return err; | |
163 | ||
164 | canrflg = in_8(®s->canrflg); | |
165 | priv->shadow_statflg = canrflg & MSCAN_STAT_MSK; | |
166 | priv->can.state = state_map[max(MSCAN_STATE_RX(canrflg), | |
167 | MSCAN_STATE_TX(canrflg))]; | |
168 | out_8(®s->cantier, 0); | |
169 | ||
170 | /* Enable receive interrupts. */ | |
bf3af547 WG |
171 | out_8(®s->canrier, MSCAN_RX_INTS_ENABLE); |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static int mscan_restart(struct net_device *dev) | |
177 | { | |
178 | struct mscan_priv *priv = netdev_priv(dev); | |
179 | ||
180 | if (priv->type == MSCAN_TYPE_MPC5121) { | |
181 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
182 | ||
183 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
184 | WARN(!(in_8(®s->canmisc) & MSCAN_BOHOLD), | |
c389ff80 | 185 | "bus-off state expected\n"); |
bf3af547 WG |
186 | out_8(®s->canmisc, MSCAN_BOHOLD); |
187 | /* Re-enable receive interrupts. */ | |
188 | out_8(®s->canrier, MSCAN_RX_INTS_ENABLE); | |
189 | } else { | |
190 | if (priv->can.state <= CAN_STATE_BUS_OFF) | |
191 | mscan_set_mode(dev, MSCAN_INIT_MODE); | |
192 | return mscan_start(dev); | |
193 | } | |
afa17a50 WS |
194 | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
199 | { | |
200 | struct can_frame *frame = (struct can_frame *)skb->data; | |
201 | struct mscan_priv *priv = netdev_priv(dev); | |
202 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
203 | int i, rtr, buf_id; | |
204 | u32 can_id; | |
205 | ||
3ccd4c61 | 206 | if (can_dropped_invalid_skb(dev, skb)) |
2d4b6faf | 207 | return NETDEV_TX_OK; |
afa17a50 WS |
208 | |
209 | out_8(®s->cantier, 0); | |
210 | ||
211 | i = ~priv->tx_active & MSCAN_TXE; | |
212 | buf_id = ffs(i) - 1; | |
213 | switch (hweight8(i)) { | |
214 | case 0: | |
215 | netif_stop_queue(dev); | |
216 | dev_err(dev->dev.parent, "Tx Ring full when queue awake!\n"); | |
217 | return NETDEV_TX_BUSY; | |
218 | case 1: | |
219 | /* | |
220 | * if buf_id < 3, then current frame will be send out of order, | |
221 | * since buffer with lower id have higher priority (hell..) | |
222 | */ | |
223 | netif_stop_queue(dev); | |
224 | case 2: | |
225 | if (buf_id < priv->prev_buf_id) { | |
226 | priv->cur_pri++; | |
227 | if (priv->cur_pri == 0xff) { | |
228 | set_bit(F_TX_WAIT_ALL, &priv->flags); | |
229 | netif_stop_queue(dev); | |
230 | } | |
231 | } | |
232 | set_bit(F_TX_PROGRESS, &priv->flags); | |
233 | break; | |
234 | } | |
235 | priv->prev_buf_id = buf_id; | |
236 | out_8(®s->cantbsel, i); | |
237 | ||
238 | rtr = frame->can_id & CAN_RTR_FLAG; | |
239 | ||
74ff60b2 | 240 | /* RTR is always the lowest bit of interest, then IDs follow */ |
afa17a50 | 241 | if (frame->can_id & CAN_EFF_FLAG) { |
74ff60b2 WS |
242 | can_id = (frame->can_id & CAN_EFF_MASK) |
243 | << (MSCAN_EFF_RTR_SHIFT + 1); | |
afa17a50 | 244 | if (rtr) |
74ff60b2 | 245 | can_id |= 1 << MSCAN_EFF_RTR_SHIFT; |
afa17a50 WS |
246 | out_be16(®s->tx.idr3_2, can_id); |
247 | ||
248 | can_id >>= 16; | |
25985edc | 249 | /* EFF_FLAGS are between the IDs :( */ |
74ff60b2 WS |
250 | can_id = (can_id & 0x7) | ((can_id << 2) & 0xffe0) |
251 | | MSCAN_EFF_FLAGS; | |
afa17a50 | 252 | } else { |
74ff60b2 WS |
253 | can_id = (frame->can_id & CAN_SFF_MASK) |
254 | << (MSCAN_SFF_RTR_SHIFT + 1); | |
afa17a50 | 255 | if (rtr) |
74ff60b2 | 256 | can_id |= 1 << MSCAN_SFF_RTR_SHIFT; |
afa17a50 WS |
257 | } |
258 | out_be16(®s->tx.idr1_0, can_id); | |
259 | ||
260 | if (!rtr) { | |
261 | void __iomem *data = ®s->tx.dsr1_0; | |
0285e7ce WS |
262 | u16 *payload = (u16 *)frame->data; |
263 | ||
afa17a50 WS |
264 | /* It is safe to write into dsr[dlc+1] */ |
265 | for (i = 0; i < (frame->can_dlc + 1) / 2; i++) { | |
266 | out_be16(data, *payload++); | |
267 | data += 2 + _MSCAN_RESERVED_DSR_SIZE; | |
268 | } | |
269 | } | |
270 | ||
271 | out_8(®s->tx.dlr, frame->can_dlc); | |
272 | out_8(®s->tx.tbpr, priv->cur_pri); | |
273 | ||
274 | /* Start transmission. */ | |
275 | out_8(®s->cantflg, 1 << buf_id); | |
276 | ||
277 | if (!test_bit(F_TX_PROGRESS, &priv->flags)) | |
278 | dev->trans_start = jiffies; | |
279 | ||
280 | list_add_tail(&priv->tx_queue[buf_id].list, &priv->tx_head); | |
281 | ||
282 | can_put_echo_skb(skb, dev, buf_id); | |
283 | ||
284 | /* Enable interrupt. */ | |
285 | priv->tx_active |= 1 << buf_id; | |
286 | out_8(®s->cantier, priv->tx_active); | |
287 | ||
288 | return NETDEV_TX_OK; | |
289 | } | |
290 | ||
291 | /* This function returns the old state to see where we came from */ | |
292 | static enum can_state check_set_state(struct net_device *dev, u8 canrflg) | |
293 | { | |
294 | struct mscan_priv *priv = netdev_priv(dev); | |
295 | enum can_state state, old_state = priv->can.state; | |
296 | ||
297 | if (canrflg & MSCAN_CSCIF && old_state <= CAN_STATE_BUS_OFF) { | |
298 | state = state_map[max(MSCAN_STATE_RX(canrflg), | |
299 | MSCAN_STATE_TX(canrflg))]; | |
300 | priv->can.state = state; | |
301 | } | |
302 | return old_state; | |
303 | } | |
304 | ||
305 | static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame) | |
306 | { | |
307 | struct mscan_priv *priv = netdev_priv(dev); | |
308 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
309 | u32 can_id; | |
310 | int i; | |
311 | ||
312 | can_id = in_be16(®s->rx.idr1_0); | |
313 | if (can_id & (1 << 3)) { | |
314 | frame->can_id = CAN_EFF_FLAG; | |
315 | can_id = ((can_id << 16) | in_be16(®s->rx.idr3_2)); | |
316 | can_id = ((can_id & 0xffe00000) | | |
317 | ((can_id & 0x7ffff) << 2)) >> 2; | |
318 | } else { | |
319 | can_id >>= 4; | |
320 | frame->can_id = 0; | |
321 | } | |
322 | ||
323 | frame->can_id |= can_id >> 1; | |
324 | if (can_id & 1) | |
325 | frame->can_id |= CAN_RTR_FLAG; | |
c7cd606f OH |
326 | |
327 | frame->can_dlc = get_can_dlc(in_8(®s->rx.dlr) & 0xf); | |
afa17a50 WS |
328 | |
329 | if (!(frame->can_id & CAN_RTR_FLAG)) { | |
330 | void __iomem *data = ®s->rx.dsr1_0; | |
0285e7ce WS |
331 | u16 *payload = (u16 *)frame->data; |
332 | ||
afa17a50 WS |
333 | for (i = 0; i < (frame->can_dlc + 1) / 2; i++) { |
334 | *payload++ = in_be16(data); | |
335 | data += 2 + _MSCAN_RESERVED_DSR_SIZE; | |
336 | } | |
337 | } | |
338 | ||
339 | out_8(®s->canrflg, MSCAN_RXF); | |
340 | } | |
341 | ||
342 | static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame, | |
343 | u8 canrflg) | |
344 | { | |
345 | struct mscan_priv *priv = netdev_priv(dev); | |
346 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
347 | struct net_device_stats *stats = &dev->stats; | |
348 | enum can_state old_state; | |
349 | ||
350 | dev_dbg(dev->dev.parent, "error interrupt (canrflg=%#x)\n", canrflg); | |
351 | frame->can_id = CAN_ERR_FLAG; | |
352 | ||
353 | if (canrflg & MSCAN_OVRIF) { | |
354 | frame->can_id |= CAN_ERR_CRTL; | |
355 | frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
356 | stats->rx_over_errors++; | |
357 | stats->rx_errors++; | |
0285e7ce | 358 | } else { |
afa17a50 | 359 | frame->data[1] = 0; |
0285e7ce | 360 | } |
afa17a50 WS |
361 | |
362 | old_state = check_set_state(dev, canrflg); | |
363 | /* State changed */ | |
364 | if (old_state != priv->can.state) { | |
365 | switch (priv->can.state) { | |
366 | case CAN_STATE_ERROR_WARNING: | |
367 | frame->can_id |= CAN_ERR_CRTL; | |
368 | priv->can.can_stats.error_warning++; | |
369 | if ((priv->shadow_statflg & MSCAN_RSTAT_MSK) < | |
370 | (canrflg & MSCAN_RSTAT_MSK)) | |
371 | frame->data[1] |= CAN_ERR_CRTL_RX_WARNING; | |
afa17a50 WS |
372 | if ((priv->shadow_statflg & MSCAN_TSTAT_MSK) < |
373 | (canrflg & MSCAN_TSTAT_MSK)) | |
374 | frame->data[1] |= CAN_ERR_CRTL_TX_WARNING; | |
375 | break; | |
376 | case CAN_STATE_ERROR_PASSIVE: | |
377 | frame->can_id |= CAN_ERR_CRTL; | |
378 | priv->can.can_stats.error_passive++; | |
379 | frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; | |
380 | break; | |
381 | case CAN_STATE_BUS_OFF: | |
382 | frame->can_id |= CAN_ERR_BUSOFF; | |
383 | /* | |
384 | * The MSCAN on the MPC5200 does recover from bus-off | |
385 | * automatically. To avoid that we stop the chip doing | |
386 | * a light-weight stop (we are in irq-context). | |
387 | */ | |
bf3af547 WG |
388 | if (priv->type != MSCAN_TYPE_MPC5121) { |
389 | out_8(®s->cantier, 0); | |
390 | out_8(®s->canrier, 0); | |
391 | setbits8(®s->canctl0, | |
392 | MSCAN_SLPRQ | MSCAN_INITRQ); | |
393 | } | |
afa17a50 WS |
394 | can_bus_off(dev); |
395 | break; | |
396 | default: | |
397 | break; | |
398 | } | |
399 | } | |
400 | priv->shadow_statflg = canrflg & MSCAN_STAT_MSK; | |
401 | frame->can_dlc = CAN_ERR_DLC; | |
402 | out_8(®s->canrflg, MSCAN_ERR_IF); | |
403 | } | |
404 | ||
405 | static int mscan_rx_poll(struct napi_struct *napi, int quota) | |
406 | { | |
407 | struct mscan_priv *priv = container_of(napi, struct mscan_priv, napi); | |
408 | struct net_device *dev = napi->dev; | |
409 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
410 | struct net_device_stats *stats = &dev->stats; | |
411 | int npackets = 0; | |
412 | int ret = 1; | |
413 | struct sk_buff *skb; | |
414 | struct can_frame *frame; | |
415 | u8 canrflg; | |
416 | ||
68bd7422 WS |
417 | while (npackets < quota) { |
418 | canrflg = in_8(®s->canrflg); | |
419 | if (!(canrflg & (MSCAN_RXF | MSCAN_ERR_IF))) | |
420 | break; | |
afa17a50 WS |
421 | |
422 | skb = alloc_can_skb(dev, &frame); | |
423 | if (!skb) { | |
424 | if (printk_ratelimit()) | |
425 | dev_notice(dev->dev.parent, "packet dropped\n"); | |
426 | stats->rx_dropped++; | |
427 | out_8(®s->canrflg, canrflg); | |
428 | continue; | |
429 | } | |
430 | ||
431 | if (canrflg & MSCAN_RXF) | |
432 | mscan_get_rx_frame(dev, frame); | |
0285e7ce | 433 | else if (canrflg & MSCAN_ERR_IF) |
afa17a50 WS |
434 | mscan_get_err_frame(dev, frame, canrflg); |
435 | ||
436 | stats->rx_packets++; | |
437 | stats->rx_bytes += frame->can_dlc; | |
438 | npackets++; | |
439 | netif_receive_skb(skb); | |
440 | } | |
441 | ||
442 | if (!(in_8(®s->canrflg) & (MSCAN_RXF | MSCAN_ERR_IF))) { | |
443 | napi_complete(&priv->napi); | |
444 | clear_bit(F_RX_PROGRESS, &priv->flags); | |
445 | if (priv->can.state < CAN_STATE_BUS_OFF) | |
446 | out_8(®s->canrier, priv->shadow_canrier); | |
447 | ret = 0; | |
448 | } | |
449 | return ret; | |
450 | } | |
451 | ||
452 | static irqreturn_t mscan_isr(int irq, void *dev_id) | |
453 | { | |
454 | struct net_device *dev = (struct net_device *)dev_id; | |
455 | struct mscan_priv *priv = netdev_priv(dev); | |
456 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
457 | struct net_device_stats *stats = &dev->stats; | |
458 | u8 cantier, cantflg, canrflg; | |
459 | irqreturn_t ret = IRQ_NONE; | |
460 | ||
461 | cantier = in_8(®s->cantier) & MSCAN_TXE; | |
462 | cantflg = in_8(®s->cantflg) & cantier; | |
463 | ||
464 | if (cantier && cantflg) { | |
afa17a50 WS |
465 | struct list_head *tmp, *pos; |
466 | ||
467 | list_for_each_safe(pos, tmp, &priv->tx_head) { | |
468 | struct tx_queue_entry *entry = | |
469 | list_entry(pos, struct tx_queue_entry, list); | |
470 | u8 mask = entry->mask; | |
471 | ||
472 | if (!(cantflg & mask)) | |
473 | continue; | |
474 | ||
475 | out_8(®s->cantbsel, mask); | |
476 | stats->tx_bytes += in_8(®s->tx.dlr); | |
477 | stats->tx_packets++; | |
478 | can_get_echo_skb(dev, entry->id); | |
479 | priv->tx_active &= ~mask; | |
480 | list_del(pos); | |
481 | } | |
482 | ||
483 | if (list_empty(&priv->tx_head)) { | |
484 | clear_bit(F_TX_WAIT_ALL, &priv->flags); | |
485 | clear_bit(F_TX_PROGRESS, &priv->flags); | |
486 | priv->cur_pri = 0; | |
0285e7ce | 487 | } else { |
afa17a50 | 488 | dev->trans_start = jiffies; |
0285e7ce | 489 | } |
afa17a50 WS |
490 | |
491 | if (!test_bit(F_TX_WAIT_ALL, &priv->flags)) | |
492 | netif_wake_queue(dev); | |
493 | ||
494 | out_8(®s->cantier, priv->tx_active); | |
495 | ret = IRQ_HANDLED; | |
496 | } | |
497 | ||
498 | canrflg = in_8(®s->canrflg); | |
499 | if ((canrflg & ~MSCAN_STAT_MSK) && | |
500 | !test_and_set_bit(F_RX_PROGRESS, &priv->flags)) { | |
501 | if (canrflg & ~MSCAN_STAT_MSK) { | |
502 | priv->shadow_canrier = in_8(®s->canrier); | |
503 | out_8(®s->canrier, 0); | |
504 | napi_schedule(&priv->napi); | |
505 | ret = IRQ_HANDLED; | |
0285e7ce | 506 | } else { |
afa17a50 | 507 | clear_bit(F_RX_PROGRESS, &priv->flags); |
0285e7ce | 508 | } |
afa17a50 WS |
509 | } |
510 | return ret; | |
511 | } | |
512 | ||
513 | static int mscan_do_set_mode(struct net_device *dev, enum can_mode mode) | |
514 | { | |
afa17a50 WS |
515 | struct mscan_priv *priv = netdev_priv(dev); |
516 | int ret = 0; | |
517 | ||
518 | if (!priv->open_time) | |
519 | return -EINVAL; | |
520 | ||
521 | switch (mode) { | |
afa17a50 | 522 | case CAN_MODE_START: |
bf3af547 | 523 | ret = mscan_restart(dev); |
afa17a50 WS |
524 | if (ret) |
525 | break; | |
526 | if (netif_queue_stopped(dev)) | |
527 | netif_wake_queue(dev); | |
528 | break; | |
529 | ||
530 | default: | |
531 | ret = -EOPNOTSUPP; | |
532 | break; | |
533 | } | |
534 | return ret; | |
535 | } | |
536 | ||
537 | static int mscan_do_set_bittiming(struct net_device *dev) | |
538 | { | |
539 | struct mscan_priv *priv = netdev_priv(dev); | |
540 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
541 | struct can_bittiming *bt = &priv->can.bittiming; | |
542 | u8 btr0, btr1; | |
543 | ||
544 | btr0 = BTR0_SET_BRP(bt->brp) | BTR0_SET_SJW(bt->sjw); | |
545 | btr1 = (BTR1_SET_TSEG1(bt->prop_seg + bt->phase_seg1) | | |
546 | BTR1_SET_TSEG2(bt->phase_seg2) | | |
547 | BTR1_SET_SAM(priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)); | |
548 | ||
549 | dev_info(dev->dev.parent, "setting BTR0=0x%02x BTR1=0x%02x\n", | |
550 | btr0, btr1); | |
551 | ||
552 | out_8(®s->canbtr0, btr0); | |
553 | out_8(®s->canbtr1, btr1); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int mscan_open(struct net_device *dev) | |
559 | { | |
560 | int ret; | |
561 | struct mscan_priv *priv = netdev_priv(dev); | |
562 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
563 | ||
564 | /* common open */ | |
565 | ret = open_candev(dev); | |
566 | if (ret) | |
567 | return ret; | |
568 | ||
569 | napi_enable(&priv->napi); | |
570 | ||
571 | ret = request_irq(dev->irq, mscan_isr, 0, dev->name, dev); | |
572 | if (ret < 0) { | |
323907ac WS |
573 | dev_err(dev->dev.parent, "failed to attach interrupt\n"); |
574 | goto exit_napi_disable; | |
afa17a50 WS |
575 | } |
576 | ||
577 | priv->open_time = jiffies; | |
578 | ||
59179ea6 | 579 | clrbits8(®s->canctl1, MSCAN_LISTEN); |
afa17a50 WS |
580 | |
581 | ret = mscan_start(dev); | |
582 | if (ret) | |
323907ac | 583 | goto exit_free_irq; |
afa17a50 WS |
584 | |
585 | netif_start_queue(dev); | |
586 | ||
587 | return 0; | |
323907ac WS |
588 | |
589 | exit_free_irq: | |
590 | priv->open_time = 0; | |
591 | free_irq(dev->irq, dev); | |
592 | exit_napi_disable: | |
593 | napi_disable(&priv->napi); | |
594 | close_candev(dev); | |
595 | return ret; | |
afa17a50 WS |
596 | } |
597 | ||
598 | static int mscan_close(struct net_device *dev) | |
599 | { | |
600 | struct mscan_priv *priv = netdev_priv(dev); | |
601 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
602 | ||
603 | netif_stop_queue(dev); | |
604 | napi_disable(&priv->napi); | |
605 | ||
606 | out_8(®s->cantier, 0); | |
607 | out_8(®s->canrier, 0); | |
608 | mscan_set_mode(dev, MSCAN_INIT_MODE); | |
609 | close_candev(dev); | |
610 | free_irq(dev->irq, dev); | |
611 | priv->open_time = 0; | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | static const struct net_device_ops mscan_netdev_ops = { | |
617 | .ndo_open = mscan_open, | |
618 | .ndo_stop = mscan_close, | |
619 | .ndo_start_xmit = mscan_start_xmit, | |
620 | }; | |
621 | ||
bf3af547 | 622 | int register_mscandev(struct net_device *dev, int mscan_clksrc) |
afa17a50 WS |
623 | { |
624 | struct mscan_priv *priv = netdev_priv(dev); | |
625 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
626 | u8 ctl1; | |
627 | ||
628 | ctl1 = in_8(®s->canctl1); | |
bf3af547 | 629 | if (mscan_clksrc) |
afa17a50 WS |
630 | ctl1 |= MSCAN_CLKSRC; |
631 | else | |
632 | ctl1 &= ~MSCAN_CLKSRC; | |
633 | ||
bf3af547 WG |
634 | if (priv->type == MSCAN_TYPE_MPC5121) |
635 | ctl1 |= MSCAN_BORM; /* bus-off recovery upon request */ | |
636 | ||
afa17a50 WS |
637 | ctl1 |= MSCAN_CANE; |
638 | out_8(®s->canctl1, ctl1); | |
639 | udelay(100); | |
640 | ||
641 | /* acceptance mask/acceptance code (accept everything) */ | |
642 | out_be16(®s->canidar1_0, 0); | |
643 | out_be16(®s->canidar3_2, 0); | |
644 | out_be16(®s->canidar5_4, 0); | |
645 | out_be16(®s->canidar7_6, 0); | |
646 | ||
647 | out_be16(®s->canidmr1_0, 0xffff); | |
648 | out_be16(®s->canidmr3_2, 0xffff); | |
649 | out_be16(®s->canidmr5_4, 0xffff); | |
650 | out_be16(®s->canidmr7_6, 0xffff); | |
651 | /* Two 32 bit Acceptance Filters */ | |
652 | out_8(®s->canidac, MSCAN_AF_32BIT); | |
653 | ||
654 | mscan_set_mode(dev, MSCAN_INIT_MODE); | |
655 | ||
656 | return register_candev(dev); | |
657 | } | |
afa17a50 WS |
658 | |
659 | void unregister_mscandev(struct net_device *dev) | |
660 | { | |
661 | struct mscan_priv *priv = netdev_priv(dev); | |
662 | struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base; | |
663 | mscan_set_mode(dev, MSCAN_INIT_MODE); | |
59179ea6 | 664 | clrbits8(®s->canctl1, MSCAN_CANE); |
afa17a50 WS |
665 | unregister_candev(dev); |
666 | } | |
afa17a50 WS |
667 | |
668 | struct net_device *alloc_mscandev(void) | |
669 | { | |
670 | struct net_device *dev; | |
671 | struct mscan_priv *priv; | |
672 | int i; | |
673 | ||
674 | dev = alloc_candev(sizeof(struct mscan_priv), MSCAN_ECHO_SKB_MAX); | |
675 | if (!dev) | |
676 | return NULL; | |
677 | priv = netdev_priv(dev); | |
678 | ||
679 | dev->netdev_ops = &mscan_netdev_ops; | |
680 | ||
681 | dev->flags |= IFF_ECHO; /* we support local echo */ | |
682 | ||
683 | netif_napi_add(dev, &priv->napi, mscan_rx_poll, 8); | |
684 | ||
685 | priv->can.bittiming_const = &mscan_bittiming_const; | |
686 | priv->can.do_set_bittiming = mscan_do_set_bittiming; | |
687 | priv->can.do_set_mode = mscan_do_set_mode; | |
ad72c347 | 688 | priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; |
afa17a50 WS |
689 | |
690 | for (i = 0; i < TX_QUEUE_SIZE; i++) { | |
691 | priv->tx_queue[i].id = i; | |
692 | priv->tx_queue[i].mask = 1 << i; | |
693 | } | |
694 | ||
695 | return dev; | |
696 | } | |
afa17a50 WS |
697 | |
698 | MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>"); | |
699 | MODULE_LICENSE("GPL v2"); | |
700 | MODULE_DESCRIPTION("CAN port driver for a MSCAN based chips"); |