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881ff67a BS |
1 | /* |
2 | * CAN bus driver for Bosch C_CAN controller | |
3 | * | |
4 | * Copyright (C) 2010 ST Microelectronics | |
5 | * Bhupesh Sharma <bhupesh.sharma@st.com> | |
6 | * | |
7 | * Borrowed heavily from the C_CAN driver originally written by: | |
8 | * Copyright (C) 2007 | |
9 | * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer@pengutronix.de> | |
10 | * - Simon Kallweit, intefo AG <simon.kallweit@intefo.ch> | |
11 | * | |
12 | * TX and RX NAPI implementation has been borrowed from at91 CAN driver | |
13 | * written by: | |
14 | * Copyright | |
15 | * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de> | |
16 | * (C) 2008, 2009 by Marc Kleine-Budde <kernel@pengutronix.de> | |
17 | * | |
18 | * Bosch C_CAN controller is compliant to CAN protocol version 2.0 part A and B. | |
19 | * Bosch C_CAN user manual can be obtained from: | |
20 | * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/c_can/ | |
21 | * users_manual_c_can.pdf | |
22 | * | |
23 | * This file is licensed under the terms of the GNU General Public | |
24 | * License version 2. This program is licensed "as is" without any | |
25 | * warranty of any kind, whether express or implied. | |
26 | */ | |
27 | ||
28 | #include <linux/kernel.h> | |
881ff67a BS |
29 | #include <linux/module.h> |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/if_arp.h> | |
34 | #include <linux/if_ether.h> | |
35 | #include <linux/list.h> | |
881ff67a | 36 | #include <linux/io.h> |
4cdd34b2 | 37 | #include <linux/pm_runtime.h> |
3973c526 | 38 | #include <linux/pinctrl/consumer.h> |
881ff67a BS |
39 | |
40 | #include <linux/can.h> | |
41 | #include <linux/can/dev.h> | |
42 | #include <linux/can/error.h> | |
5090f805 | 43 | #include <linux/can/led.h> |
881ff67a BS |
44 | |
45 | #include "c_can.h" | |
46 | ||
33f81009 AC |
47 | /* Number of interface registers */ |
48 | #define IF_ENUM_REG_LEN 11 | |
49 | #define C_CAN_IFACE(reg, iface) (C_CAN_IF1_##reg + (iface) * IF_ENUM_REG_LEN) | |
50 | ||
82120032 AC |
51 | /* control extension register D_CAN specific */ |
52 | #define CONTROL_EX_PDR BIT(8) | |
53 | ||
881ff67a BS |
54 | /* control register */ |
55 | #define CONTROL_TEST BIT(7) | |
56 | #define CONTROL_CCE BIT(6) | |
57 | #define CONTROL_DISABLE_AR BIT(5) | |
58 | #define CONTROL_ENABLE_AR (0 << 5) | |
59 | #define CONTROL_EIE BIT(3) | |
60 | #define CONTROL_SIE BIT(2) | |
61 | #define CONTROL_IE BIT(1) | |
62 | #define CONTROL_INIT BIT(0) | |
63 | ||
2d5f4f85 TG |
64 | #define CONTROL_IRQMSK (CONTROL_EIE | CONTROL_IE | CONTROL_SIE) |
65 | ||
881ff67a BS |
66 | /* test register */ |
67 | #define TEST_RX BIT(7) | |
68 | #define TEST_TX1 BIT(6) | |
69 | #define TEST_TX2 BIT(5) | |
70 | #define TEST_LBACK BIT(4) | |
71 | #define TEST_SILENT BIT(3) | |
72 | #define TEST_BASIC BIT(2) | |
73 | ||
74 | /* status register */ | |
82120032 | 75 | #define STATUS_PDA BIT(10) |
881ff67a BS |
76 | #define STATUS_BOFF BIT(7) |
77 | #define STATUS_EWARN BIT(6) | |
78 | #define STATUS_EPASS BIT(5) | |
79 | #define STATUS_RXOK BIT(4) | |
80 | #define STATUS_TXOK BIT(3) | |
81 | ||
82 | /* error counter register */ | |
83 | #define ERR_CNT_TEC_MASK 0xff | |
84 | #define ERR_CNT_TEC_SHIFT 0 | |
85 | #define ERR_CNT_REC_SHIFT 8 | |
86 | #define ERR_CNT_REC_MASK (0x7f << ERR_CNT_REC_SHIFT) | |
87 | #define ERR_CNT_RP_SHIFT 15 | |
88 | #define ERR_CNT_RP_MASK (0x1 << ERR_CNT_RP_SHIFT) | |
89 | ||
90 | /* bit-timing register */ | |
91 | #define BTR_BRP_MASK 0x3f | |
92 | #define BTR_BRP_SHIFT 0 | |
93 | #define BTR_SJW_SHIFT 6 | |
94 | #define BTR_SJW_MASK (0x3 << BTR_SJW_SHIFT) | |
95 | #define BTR_TSEG1_SHIFT 8 | |
96 | #define BTR_TSEG1_MASK (0xf << BTR_TSEG1_SHIFT) | |
97 | #define BTR_TSEG2_SHIFT 12 | |
98 | #define BTR_TSEG2_MASK (0x7 << BTR_TSEG2_SHIFT) | |
99 | ||
100 | /* brp extension register */ | |
101 | #define BRP_EXT_BRPE_MASK 0x0f | |
102 | #define BRP_EXT_BRPE_SHIFT 0 | |
103 | ||
104 | /* IFx command request */ | |
105 | #define IF_COMR_BUSY BIT(15) | |
106 | ||
107 | /* IFx command mask */ | |
108 | #define IF_COMM_WR BIT(7) | |
109 | #define IF_COMM_MASK BIT(6) | |
110 | #define IF_COMM_ARB BIT(5) | |
111 | #define IF_COMM_CONTROL BIT(4) | |
112 | #define IF_COMM_CLR_INT_PND BIT(3) | |
113 | #define IF_COMM_TXRQST BIT(2) | |
6b48ff8d | 114 | #define IF_COMM_CLR_NEWDAT IF_COMM_TXRQST |
881ff67a BS |
115 | #define IF_COMM_DATAA BIT(1) |
116 | #define IF_COMM_DATAB BIT(0) | |
23ef0a89 TG |
117 | |
118 | /* TX buffer setup */ | |
119 | #define IF_COMM_TX (IF_COMM_ARB | IF_COMM_CONTROL | \ | |
120 | IF_COMM_TXRQST | \ | |
121 | IF_COMM_DATAA | IF_COMM_DATAB) | |
881ff67a | 122 | |
c0a9f4d3 TG |
123 | /* For the low buffers we clear the interrupt bit, but keep newdat */ |
124 | #define IF_COMM_RCV_LOW (IF_COMM_MASK | IF_COMM_ARB | \ | |
125 | IF_COMM_CONTROL | IF_COMM_CLR_INT_PND | \ | |
126 | IF_COMM_DATAA | IF_COMM_DATAB) | |
127 | ||
128 | /* For the high buffers we clear the interrupt bit and newdat */ | |
6b48ff8d | 129 | #define IF_COMM_RCV_HIGH (IF_COMM_RCV_LOW | IF_COMM_CLR_NEWDAT) |
c0a9f4d3 | 130 | |
8ff2de0f TG |
131 | |
132 | /* Receive setup of message objects */ | |
133 | #define IF_COMM_RCV_SETUP (IF_COMM_MASK | IF_COMM_ARB | IF_COMM_CONTROL) | |
134 | ||
b07faaaf TG |
135 | /* Invalidation of message objects */ |
136 | #define IF_COMM_INVAL (IF_COMM_ARB | IF_COMM_CONTROL) | |
137 | ||
881ff67a | 138 | /* IFx arbitration */ |
d48071be TG |
139 | #define IF_ARB_MSGVAL BIT(31) |
140 | #define IF_ARB_MSGXTD BIT(30) | |
141 | #define IF_ARB_TRANSMIT BIT(29) | |
881ff67a BS |
142 | |
143 | /* IFx message control */ | |
144 | #define IF_MCONT_NEWDAT BIT(15) | |
145 | #define IF_MCONT_MSGLST BIT(14) | |
881ff67a BS |
146 | #define IF_MCONT_INTPND BIT(13) |
147 | #define IF_MCONT_UMASK BIT(12) | |
148 | #define IF_MCONT_TXIE BIT(11) | |
149 | #define IF_MCONT_RXIE BIT(10) | |
150 | #define IF_MCONT_RMTEN BIT(9) | |
151 | #define IF_MCONT_TXRQST BIT(8) | |
152 | #define IF_MCONT_EOB BIT(7) | |
153 | #define IF_MCONT_DLC_MASK 0xf | |
154 | ||
8ff2de0f TG |
155 | #define IF_MCONT_RCV (IF_MCONT_RXIE | IF_MCONT_UMASK) |
156 | #define IF_MCONT_RCV_EOB (IF_MCONT_RCV | IF_MCONT_EOB) | |
157 | ||
23ef0a89 TG |
158 | #define IF_MCONT_TX (IF_MCONT_TXIE | IF_MCONT_EOB) |
159 | ||
881ff67a | 160 | /* |
640916db | 161 | * Use IF1 for RX and IF2 for TX |
881ff67a | 162 | */ |
640916db TG |
163 | #define IF_RX 0 |
164 | #define IF_TX 1 | |
881ff67a | 165 | |
881ff67a BS |
166 | /* minimum timeout for checking BUSY status */ |
167 | #define MIN_TIMEOUT_VALUE 6 | |
168 | ||
82120032 AC |
169 | /* Wait for ~1 sec for INIT bit */ |
170 | #define INIT_WAIT_MS 1000 | |
171 | ||
881ff67a BS |
172 | /* napi related */ |
173 | #define C_CAN_NAPI_WEIGHT C_CAN_MSG_OBJ_RX_NUM | |
174 | ||
175 | /* c_can lec values */ | |
176 | enum c_can_lec_type { | |
177 | LEC_NO_ERROR = 0, | |
178 | LEC_STUFF_ERROR, | |
179 | LEC_FORM_ERROR, | |
180 | LEC_ACK_ERROR, | |
181 | LEC_BIT1_ERROR, | |
182 | LEC_BIT0_ERROR, | |
183 | LEC_CRC_ERROR, | |
184 | LEC_UNUSED, | |
097aec19 | 185 | LEC_MASK = LEC_UNUSED, |
881ff67a BS |
186 | }; |
187 | ||
188 | /* | |
189 | * c_can error types: | |
190 | * Bus errors (BUS_OFF, ERROR_WARNING, ERROR_PASSIVE) are supported | |
191 | */ | |
192 | enum c_can_bus_error_types { | |
193 | C_CAN_NO_ERROR = 0, | |
194 | C_CAN_BUS_OFF, | |
195 | C_CAN_ERROR_WARNING, | |
196 | C_CAN_ERROR_PASSIVE, | |
197 | }; | |
198 | ||
194b9a4c | 199 | static const struct can_bittiming_const c_can_bittiming_const = { |
881ff67a BS |
200 | .name = KBUILD_MODNAME, |
201 | .tseg1_min = 2, /* Time segment 1 = prop_seg + phase_seg1 */ | |
202 | .tseg1_max = 16, | |
203 | .tseg2_min = 1, /* Time segment 2 = phase_seg2 */ | |
204 | .tseg2_max = 8, | |
205 | .sjw_max = 4, | |
206 | .brp_min = 1, | |
207 | .brp_max = 1024, /* 6-bit BRP field + 4-bit BRPE field*/ | |
208 | .brp_inc = 1, | |
209 | }; | |
210 | ||
4cdd34b2 AC |
211 | static inline void c_can_pm_runtime_enable(const struct c_can_priv *priv) |
212 | { | |
213 | if (priv->device) | |
214 | pm_runtime_enable(priv->device); | |
215 | } | |
216 | ||
217 | static inline void c_can_pm_runtime_disable(const struct c_can_priv *priv) | |
218 | { | |
219 | if (priv->device) | |
220 | pm_runtime_disable(priv->device); | |
221 | } | |
222 | ||
223 | static inline void c_can_pm_runtime_get_sync(const struct c_can_priv *priv) | |
224 | { | |
225 | if (priv->device) | |
226 | pm_runtime_get_sync(priv->device); | |
227 | } | |
228 | ||
229 | static inline void c_can_pm_runtime_put_sync(const struct c_can_priv *priv) | |
230 | { | |
231 | if (priv->device) | |
232 | pm_runtime_put_sync(priv->device); | |
233 | } | |
234 | ||
52cde85a AC |
235 | static inline void c_can_reset_ram(const struct c_can_priv *priv, bool enable) |
236 | { | |
237 | if (priv->raminit) | |
238 | priv->raminit(priv, enable); | |
239 | } | |
240 | ||
2d5f4f85 | 241 | static void c_can_irq_control(struct c_can_priv *priv, bool enable) |
881ff67a | 242 | { |
2d5f4f85 | 243 | u32 ctrl = priv->read_reg(priv, C_CAN_CTRL_REG) & ~CONTROL_IRQMSK; |
881ff67a BS |
244 | |
245 | if (enable) | |
2d5f4f85 | 246 | ctrl |= CONTROL_IRQMSK; |
881ff67a | 247 | |
2d5f4f85 | 248 | priv->write_reg(priv, C_CAN_CTRL_REG, ctrl); |
881ff67a BS |
249 | } |
250 | ||
7af28630 | 251 | static void c_can_obj_update(struct net_device *dev, int iface, u32 cmd, u32 obj) |
881ff67a | 252 | { |
7af28630 TG |
253 | struct c_can_priv *priv = netdev_priv(dev); |
254 | int cnt, reg = C_CAN_IFACE(COMREQ_REG, iface); | |
255 | ||
ccbc5357 | 256 | priv->write_reg32(priv, reg, (cmd << 16) | obj); |
881ff67a | 257 | |
7af28630 TG |
258 | for (cnt = MIN_TIMEOUT_VALUE; cnt; cnt--) { |
259 | if (!(priv->read_reg(priv, reg) & IF_COMR_BUSY)) | |
260 | return; | |
881ff67a BS |
261 | udelay(1); |
262 | } | |
7af28630 | 263 | netdev_err(dev, "Updating object timed out\n"); |
881ff67a | 264 | |
881ff67a BS |
265 | } |
266 | ||
7af28630 TG |
267 | static inline void c_can_object_get(struct net_device *dev, int iface, |
268 | u32 obj, u32 cmd) | |
881ff67a | 269 | { |
7af28630 | 270 | c_can_obj_update(dev, iface, cmd, obj); |
881ff67a BS |
271 | } |
272 | ||
7af28630 TG |
273 | static inline void c_can_object_put(struct net_device *dev, int iface, |
274 | u32 obj, u32 cmd) | |
881ff67a | 275 | { |
7af28630 | 276 | c_can_obj_update(dev, iface, cmd | IF_COMM_WR, obj); |
881ff67a BS |
277 | } |
278 | ||
93941597 TG |
279 | /* |
280 | * Note: According to documentation clearing TXIE while MSGVAL is set | |
281 | * is not allowed, but works nicely on C/DCAN. And that lowers the I/O | |
282 | * load significantly. | |
283 | */ | |
284 | static void c_can_inval_tx_object(struct net_device *dev, int iface, int obj) | |
285 | { | |
286 | struct c_can_priv *priv = netdev_priv(dev); | |
287 | ||
288 | priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), 0); | |
289 | c_can_object_put(dev, iface, obj, IF_COMM_INVAL); | |
290 | } | |
291 | ||
292 | static void c_can_inval_msg_object(struct net_device *dev, int iface, int obj) | |
293 | { | |
294 | struct c_can_priv *priv = netdev_priv(dev); | |
295 | ||
296 | priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface), 0); | |
297 | priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface), 0); | |
298 | c_can_inval_tx_object(dev, iface, obj); | |
299 | } | |
300 | ||
35bdafb5 | 301 | static void c_can_setup_tx_object(struct net_device *dev, int iface, |
93941597 | 302 | struct can_frame *frame, int idx) |
881ff67a | 303 | { |
881ff67a | 304 | struct c_can_priv *priv = netdev_priv(dev); |
23ef0a89 | 305 | u16 ctrl = IF_MCONT_TX | frame->can_dlc; |
93941597 | 306 | bool rtr = frame->can_id & CAN_RTR_FLAG; |
d48071be | 307 | u32 arb = IF_ARB_MSGVAL; |
23ef0a89 | 308 | int i; |
881ff67a BS |
309 | |
310 | if (frame->can_id & CAN_EFF_FLAG) { | |
23ef0a89 | 311 | arb |= frame->can_id & CAN_EFF_MASK; |
d48071be | 312 | arb |= IF_ARB_MSGXTD; |
23ef0a89 TG |
313 | } else { |
314 | arb |= (frame->can_id & CAN_SFF_MASK) << 18; | |
315 | } | |
316 | ||
93941597 | 317 | if (!rtr) |
d48071be | 318 | arb |= IF_ARB_TRANSMIT; |
881ff67a | 319 | |
93941597 TG |
320 | /* |
321 | * If we change the DIR bit, we need to invalidate the buffer | |
322 | * first, i.e. clear the MSGVAL flag in the arbiter. | |
323 | */ | |
324 | if (rtr != (bool)test_bit(idx, &priv->tx_dir)) { | |
325 | u32 obj = idx + C_CAN_MSG_OBJ_TX_FIRST; | |
326 | ||
327 | c_can_inval_msg_object(dev, iface, obj); | |
328 | change_bit(idx, &priv->tx_dir); | |
329 | } | |
330 | ||
ccbc5357 | 331 | priv->write_reg32(priv, C_CAN_IFACE(ARB1_REG, iface), arb); |
881ff67a | 332 | |
23ef0a89 | 333 | priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), ctrl); |
881ff67a BS |
334 | |
335 | for (i = 0; i < frame->can_dlc; i += 2) { | |
33f81009 | 336 | priv->write_reg(priv, C_CAN_IFACE(DATA1_REG, iface) + i / 2, |
881ff67a BS |
337 | frame->data[i] | (frame->data[i + 1] << 8)); |
338 | } | |
881ff67a BS |
339 | } |
340 | ||
881ff67a | 341 | static inline void c_can_activate_all_lower_rx_msg_obj(struct net_device *dev, |
6b48ff8d | 342 | int iface) |
881ff67a BS |
343 | { |
344 | int i; | |
881ff67a | 345 | |
6b48ff8d TG |
346 | for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_MSG_RX_LOW_LAST; i++) |
347 | c_can_object_get(dev, iface, i, IF_COMM_CLR_NEWDAT); | |
881ff67a BS |
348 | } |
349 | ||
07c7b6f6 TG |
350 | static int c_can_handle_lost_msg_obj(struct net_device *dev, |
351 | int iface, int objno, u32 ctrl) | |
881ff67a | 352 | { |
881ff67a | 353 | struct net_device_stats *stats = &dev->stats; |
07c7b6f6 | 354 | struct c_can_priv *priv = netdev_priv(dev); |
881ff67a | 355 | struct can_frame *frame; |
07c7b6f6 | 356 | struct sk_buff *skb; |
881ff67a | 357 | |
07c7b6f6 TG |
358 | ctrl &= ~(IF_MCONT_MSGLST | IF_MCONT_INTPND | IF_MCONT_NEWDAT); |
359 | priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), ctrl); | |
640916db | 360 | c_can_object_put(dev, iface, objno, IF_COMM_CONTROL); |
881ff67a | 361 | |
1da394d8 TG |
362 | stats->rx_errors++; |
363 | stats->rx_over_errors++; | |
364 | ||
881ff67a BS |
365 | /* create an error msg */ |
366 | skb = alloc_can_err_skb(dev, &frame); | |
367 | if (unlikely(!skb)) | |
07c7b6f6 | 368 | return 0; |
881ff67a BS |
369 | |
370 | frame->can_id |= CAN_ERR_CRTL; | |
371 | frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
881ff67a BS |
372 | |
373 | netif_receive_skb(skb); | |
07c7b6f6 | 374 | return 1; |
881ff67a BS |
375 | } |
376 | ||
4fb6dccd | 377 | static int c_can_read_msg_object(struct net_device *dev, int iface, u32 ctrl) |
881ff67a | 378 | { |
881ff67a | 379 | struct net_device_stats *stats = &dev->stats; |
4fb6dccd | 380 | struct c_can_priv *priv = netdev_priv(dev); |
881ff67a | 381 | struct can_frame *frame; |
4fb6dccd TG |
382 | struct sk_buff *skb; |
383 | u32 arb, data; | |
881ff67a BS |
384 | |
385 | skb = alloc_can_skb(dev, &frame); | |
386 | if (!skb) { | |
387 | stats->rx_dropped++; | |
388 | return -ENOMEM; | |
389 | } | |
390 | ||
391 | frame->can_dlc = get_can_dlc(ctrl & 0x0F); | |
392 | ||
ccbc5357 | 393 | arb = priv->read_reg32(priv, C_CAN_IFACE(ARB1_REG, iface)); |
881ff67a | 394 | |
d48071be | 395 | if (arb & IF_ARB_MSGXTD) |
4fb6dccd | 396 | frame->can_id = (arb & CAN_EFF_MASK) | CAN_EFF_FLAG; |
881ff67a | 397 | else |
4fb6dccd | 398 | frame->can_id = (arb >> 18) & CAN_SFF_MASK; |
881ff67a | 399 | |
d48071be | 400 | if (arb & IF_ARB_TRANSMIT) { |
881ff67a | 401 | frame->can_id |= CAN_RTR_FLAG; |
4fb6dccd TG |
402 | } else { |
403 | int i, dreg = C_CAN_IFACE(DATA1_REG, iface); | |
404 | ||
405 | for (i = 0; i < frame->can_dlc; i += 2, dreg ++) { | |
406 | data = priv->read_reg(priv, dreg); | |
881ff67a BS |
407 | frame->data[i] = data; |
408 | frame->data[i + 1] = data >> 8; | |
409 | } | |
410 | } | |
411 | ||
881ff67a BS |
412 | stats->rx_packets++; |
413 | stats->rx_bytes += frame->can_dlc; | |
9c64863a TG |
414 | |
415 | netif_receive_skb(skb); | |
881ff67a BS |
416 | return 0; |
417 | } | |
418 | ||
419 | static void c_can_setup_receive_object(struct net_device *dev, int iface, | |
8ff2de0f | 420 | u32 obj, u32 mask, u32 id, u32 mcont) |
881ff67a BS |
421 | { |
422 | struct c_can_priv *priv = netdev_priv(dev); | |
423 | ||
8ff2de0f | 424 | mask |= BIT(29); |
ccbc5357 | 425 | priv->write_reg32(priv, C_CAN_IFACE(MASK1_REG, iface), mask); |
881ff67a | 426 | |
d48071be | 427 | id |= IF_ARB_MSGVAL; |
ccbc5357 | 428 | priv->write_reg32(priv, C_CAN_IFACE(ARB1_REG, iface), id); |
881ff67a | 429 | |
33f81009 | 430 | priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface), mcont); |
8ff2de0f | 431 | c_can_object_put(dev, iface, obj, IF_COMM_RCV_SETUP); |
881ff67a BS |
432 | } |
433 | ||
881ff67a | 434 | static netdev_tx_t c_can_start_xmit(struct sk_buff *skb, |
35bdafb5 | 435 | struct net_device *dev) |
881ff67a | 436 | { |
881ff67a | 437 | struct can_frame *frame = (struct can_frame *)skb->data; |
35bdafb5 TG |
438 | struct c_can_priv *priv = netdev_priv(dev); |
439 | u32 idx, obj; | |
881ff67a BS |
440 | |
441 | if (can_dropped_invalid_skb(dev, skb)) | |
442 | return NETDEV_TX_OK; | |
881ff67a | 443 | /* |
35bdafb5 TG |
444 | * This is not a FIFO. C/D_CAN sends out the buffers |
445 | * prioritized. The lowest buffer number wins. | |
881ff67a | 446 | */ |
35bdafb5 TG |
447 | idx = fls(atomic_read(&priv->tx_active)); |
448 | obj = idx + C_CAN_MSG_OBJ_TX_FIRST; | |
449 | ||
450 | /* If this is the last buffer, stop the xmit queue */ | |
451 | if (idx == C_CAN_MSG_OBJ_TX_NUM - 1) | |
881ff67a | 452 | netif_stop_queue(dev); |
35bdafb5 TG |
453 | /* |
454 | * Store the message in the interface so we can call | |
455 | * can_put_echo_skb(). We must do this before we enable | |
456 | * transmit as we might race against do_tx(). | |
457 | */ | |
93941597 | 458 | c_can_setup_tx_object(dev, IF_TX, frame, idx); |
35bdafb5 TG |
459 | priv->dlc[idx] = frame->can_dlc; |
460 | can_put_echo_skb(skb, dev, idx); | |
461 | ||
462 | /* Update the active bits */ | |
463 | atomic_add((1 << idx), &priv->tx_active); | |
464 | /* Start transmission */ | |
465 | c_can_object_put(dev, IF_TX, obj, IF_COMM_TX); | |
881ff67a BS |
466 | |
467 | return NETDEV_TX_OK; | |
468 | } | |
469 | ||
9fac1d1a TG |
470 | static int c_can_wait_for_ctrl_init(struct net_device *dev, |
471 | struct c_can_priv *priv, u32 init) | |
472 | { | |
473 | int retry = 0; | |
474 | ||
475 | while (init != (priv->read_reg(priv, C_CAN_CTRL_REG) & CONTROL_INIT)) { | |
476 | udelay(10); | |
477 | if (retry++ > 1000) { | |
478 | netdev_err(dev, "CCTRL: set CONTROL_INIT failed\n"); | |
479 | return -EIO; | |
480 | } | |
481 | } | |
482 | return 0; | |
483 | } | |
484 | ||
881ff67a BS |
485 | static int c_can_set_bittiming(struct net_device *dev) |
486 | { | |
487 | unsigned int reg_btr, reg_brpe, ctrl_save; | |
488 | u8 brp, brpe, sjw, tseg1, tseg2; | |
489 | u32 ten_bit_brp; | |
490 | struct c_can_priv *priv = netdev_priv(dev); | |
491 | const struct can_bittiming *bt = &priv->can.bittiming; | |
9fac1d1a | 492 | int res; |
881ff67a BS |
493 | |
494 | /* c_can provides a 6-bit brp and 4-bit brpe fields */ | |
495 | ten_bit_brp = bt->brp - 1; | |
496 | brp = ten_bit_brp & BTR_BRP_MASK; | |
497 | brpe = ten_bit_brp >> 6; | |
498 | ||
499 | sjw = bt->sjw - 1; | |
500 | tseg1 = bt->prop_seg + bt->phase_seg1 - 1; | |
501 | tseg2 = bt->phase_seg2 - 1; | |
502 | reg_btr = brp | (sjw << BTR_SJW_SHIFT) | (tseg1 << BTR_TSEG1_SHIFT) | | |
503 | (tseg2 << BTR_TSEG2_SHIFT); | |
504 | reg_brpe = brpe & BRP_EXT_BRPE_MASK; | |
505 | ||
506 | netdev_info(dev, | |
507 | "setting BTR=%04x BRPE=%04x\n", reg_btr, reg_brpe); | |
508 | ||
33f81009 | 509 | ctrl_save = priv->read_reg(priv, C_CAN_CTRL_REG); |
9fac1d1a TG |
510 | ctrl_save &= ~CONTROL_INIT; |
511 | priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_CCE | CONTROL_INIT); | |
512 | res = c_can_wait_for_ctrl_init(dev, priv, CONTROL_INIT); | |
513 | if (res) | |
514 | return res; | |
515 | ||
33f81009 AC |
516 | priv->write_reg(priv, C_CAN_BTR_REG, reg_btr); |
517 | priv->write_reg(priv, C_CAN_BRPEXT_REG, reg_brpe); | |
518 | priv->write_reg(priv, C_CAN_CTRL_REG, ctrl_save); | |
881ff67a | 519 | |
9fac1d1a | 520 | return c_can_wait_for_ctrl_init(dev, priv, 0); |
881ff67a BS |
521 | } |
522 | ||
523 | /* | |
524 | * Configure C_CAN message objects for Tx and Rx purposes: | |
525 | * C_CAN provides a total of 32 message objects that can be configured | |
526 | * either for Tx or Rx purposes. Here the first 16 message objects are used as | |
527 | * a reception FIFO. The end of reception FIFO is signified by the EoB bit | |
528 | * being SET. The remaining 16 message objects are kept aside for Tx purposes. | |
529 | * See user guide document for further details on configuring message | |
530 | * objects. | |
531 | */ | |
532 | static void c_can_configure_msg_objects(struct net_device *dev) | |
533 | { | |
534 | int i; | |
535 | ||
536 | /* first invalidate all message objects */ | |
537 | for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_NO_OF_OBJECTS; i++) | |
640916db | 538 | c_can_inval_msg_object(dev, IF_RX, i); |
881ff67a BS |
539 | |
540 | /* setup receive message objects */ | |
541 | for (i = C_CAN_MSG_OBJ_RX_FIRST; i < C_CAN_MSG_OBJ_RX_LAST; i++) | |
8ff2de0f | 542 | c_can_setup_receive_object(dev, IF_RX, i, 0, 0, IF_MCONT_RCV); |
881ff67a | 543 | |
640916db | 544 | c_can_setup_receive_object(dev, IF_RX, C_CAN_MSG_OBJ_RX_LAST, 0, 0, |
8ff2de0f | 545 | IF_MCONT_RCV_EOB); |
881ff67a BS |
546 | } |
547 | ||
548 | /* | |
549 | * Configure C_CAN chip: | |
550 | * - enable/disable auto-retransmission | |
551 | * - set operating mode | |
552 | * - configure message objects | |
553 | */ | |
130a5171 | 554 | static int c_can_chip_config(struct net_device *dev) |
881ff67a BS |
555 | { |
556 | struct c_can_priv *priv = netdev_priv(dev); | |
557 | ||
ee6f0988 | 558 | /* enable automatic retransmission */ |
bed11db3 | 559 | priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_ENABLE_AR); |
881ff67a | 560 | |
d9cb9bd6 DC |
561 | if ((priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) && |
562 | (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)) { | |
881ff67a | 563 | /* loopback + silent mode : useful for hot self-test */ |
bed11db3 TG |
564 | priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_TEST); |
565 | priv->write_reg(priv, C_CAN_TEST_REG, TEST_LBACK | TEST_SILENT); | |
881ff67a BS |
566 | } else if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) { |
567 | /* loopback mode : useful for self-test function */ | |
bed11db3 | 568 | priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_TEST); |
33f81009 | 569 | priv->write_reg(priv, C_CAN_TEST_REG, TEST_LBACK); |
881ff67a BS |
570 | } else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) { |
571 | /* silent mode : bus-monitoring mode */ | |
bed11db3 | 572 | priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_TEST); |
33f81009 | 573 | priv->write_reg(priv, C_CAN_TEST_REG, TEST_SILENT); |
bed11db3 | 574 | } |
881ff67a BS |
575 | |
576 | /* configure message objects */ | |
577 | c_can_configure_msg_objects(dev); | |
578 | ||
579 | /* set a `lec` value so that we can check for updates later */ | |
33f81009 | 580 | priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED); |
881ff67a | 581 | |
35bdafb5 TG |
582 | /* Clear all internal status */ |
583 | atomic_set(&priv->tx_active, 0); | |
584 | priv->rxmasked = 0; | |
93941597 | 585 | priv->tx_dir = 0; |
35bdafb5 | 586 | |
881ff67a | 587 | /* set bittiming params */ |
130a5171 | 588 | return c_can_set_bittiming(dev); |
881ff67a BS |
589 | } |
590 | ||
130a5171 | 591 | static int c_can_start(struct net_device *dev) |
881ff67a BS |
592 | { |
593 | struct c_can_priv *priv = netdev_priv(dev); | |
130a5171 | 594 | int err; |
881ff67a | 595 | |
881ff67a | 596 | /* basic c_can configuration */ |
130a5171 MKB |
597 | err = c_can_chip_config(dev); |
598 | if (err) | |
599 | return err; | |
881ff67a | 600 | |
d61d09de TG |
601 | /* Setup the command for new messages */ |
602 | priv->comm_rcv_high = priv->type != BOSCH_D_CAN ? | |
603 | IF_COMM_RCV_LOW : IF_COMM_RCV_HIGH; | |
604 | ||
881ff67a BS |
605 | priv->can.state = CAN_STATE_ERROR_ACTIVE; |
606 | ||
3973c526 RQ |
607 | /* activate pins */ |
608 | pinctrl_pm_select_default_state(dev->dev.parent); | |
130a5171 | 609 | return 0; |
881ff67a BS |
610 | } |
611 | ||
612 | static void c_can_stop(struct net_device *dev) | |
613 | { | |
614 | struct c_can_priv *priv = netdev_priv(dev); | |
615 | ||
2d5f4f85 | 616 | c_can_irq_control(priv, false); |
3973c526 | 617 | |
7ffd7b4e VB |
618 | /* put ctrl to init on stop to end ongoing transmission */ |
619 | priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_INIT); | |
620 | ||
3973c526 RQ |
621 | /* deactivate pins */ |
622 | pinctrl_pm_select_sleep_state(dev->dev.parent); | |
881ff67a BS |
623 | priv->can.state = CAN_STATE_STOPPED; |
624 | } | |
625 | ||
626 | static int c_can_set_mode(struct net_device *dev, enum can_mode mode) | |
627 | { | |
bed11db3 | 628 | struct c_can_priv *priv = netdev_priv(dev); |
130a5171 MKB |
629 | int err; |
630 | ||
881ff67a BS |
631 | switch (mode) { |
632 | case CAN_MODE_START: | |
130a5171 MKB |
633 | err = c_can_start(dev); |
634 | if (err) | |
635 | return err; | |
881ff67a | 636 | netif_wake_queue(dev); |
2d5f4f85 | 637 | c_can_irq_control(priv, true); |
881ff67a BS |
638 | break; |
639 | default: | |
640 | return -EOPNOTSUPP; | |
641 | } | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
e35d46ad MKB |
646 | static int __c_can_get_berr_counter(const struct net_device *dev, |
647 | struct can_berr_counter *bec) | |
881ff67a BS |
648 | { |
649 | unsigned int reg_err_counter; | |
650 | struct c_can_priv *priv = netdev_priv(dev); | |
651 | ||
33f81009 | 652 | reg_err_counter = priv->read_reg(priv, C_CAN_ERR_CNT_REG); |
881ff67a BS |
653 | bec->rxerr = (reg_err_counter & ERR_CNT_REC_MASK) >> |
654 | ERR_CNT_REC_SHIFT; | |
655 | bec->txerr = reg_err_counter & ERR_CNT_TEC_MASK; | |
656 | ||
e35d46ad MKB |
657 | return 0; |
658 | } | |
659 | ||
660 | static int c_can_get_berr_counter(const struct net_device *dev, | |
661 | struct can_berr_counter *bec) | |
662 | { | |
663 | struct c_can_priv *priv = netdev_priv(dev); | |
664 | int err; | |
665 | ||
666 | c_can_pm_runtime_get_sync(priv); | |
667 | err = __c_can_get_berr_counter(dev, bec); | |
4cdd34b2 AC |
668 | c_can_pm_runtime_put_sync(priv); |
669 | ||
e35d46ad | 670 | return err; |
881ff67a BS |
671 | } |
672 | ||
881ff67a BS |
673 | static void c_can_do_tx(struct net_device *dev) |
674 | { | |
881ff67a BS |
675 | struct c_can_priv *priv = netdev_priv(dev); |
676 | struct net_device_stats *stats = &dev->stats; | |
35bdafb5 | 677 | u32 idx, obj, pkts = 0, bytes = 0, pend, clr; |
881ff67a | 678 | |
35bdafb5 | 679 | clr = pend = priv->read_reg(priv, C_CAN_INTPND2_REG); |
bf88a206 | 680 | |
35bdafb5 TG |
681 | while ((idx = ffs(pend))) { |
682 | idx--; | |
683 | pend &= ~(1 << idx); | |
684 | obj = idx + C_CAN_MSG_OBJ_TX_FIRST; | |
93941597 | 685 | c_can_inval_tx_object(dev, IF_RX, obj); |
35bdafb5 TG |
686 | can_get_echo_skb(dev, idx); |
687 | bytes += priv->dlc[idx]; | |
5a7513ad | 688 | pkts++; |
881ff67a BS |
689 | } |
690 | ||
35bdafb5 TG |
691 | /* Clear the bits in the tx_active mask */ |
692 | atomic_sub(clr, &priv->tx_active); | |
bf88a206 | 693 | |
35bdafb5 TG |
694 | if (clr & (1 << (C_CAN_MSG_OBJ_TX_NUM - 1))) |
695 | netif_wake_queue(dev); | |
5a7513ad TG |
696 | |
697 | if (pkts) { | |
698 | stats->tx_bytes += bytes; | |
699 | stats->tx_packets += pkts; | |
700 | can_led_event(dev, CAN_LED_EVENT_TX); | |
701 | } | |
881ff67a BS |
702 | } |
703 | ||
64f08f2f TG |
704 | /* |
705 | * If we have a gap in the pending bits, that means we either | |
706 | * raced with the hardware or failed to readout all upper | |
707 | * objects in the last run due to quota limit. | |
708 | */ | |
709 | static u32 c_can_adjust_pending(u32 pend) | |
710 | { | |
711 | u32 weight, lasts; | |
712 | ||
713 | if (pend == RECEIVE_OBJECT_BITS) | |
714 | return pend; | |
715 | ||
716 | /* | |
717 | * If the last set bit is larger than the number of pending | |
718 | * bits we have a gap. | |
719 | */ | |
720 | weight = hweight32(pend); | |
721 | lasts = fls(pend); | |
722 | ||
723 | /* If the bits are linear, nothing to do */ | |
724 | if (lasts == weight) | |
725 | return pend; | |
726 | ||
727 | /* | |
728 | * Find the first set bit after the gap. We walk backwards | |
729 | * from the last set bit. | |
730 | */ | |
731 | for (lasts--; pend & (1 << (lasts - 1)); lasts--); | |
732 | ||
733 | return pend & ~((1 << lasts) - 1); | |
734 | } | |
735 | ||
d61d09de TG |
736 | static inline void c_can_rx_object_get(struct net_device *dev, |
737 | struct c_can_priv *priv, u32 obj) | |
2b9aecdc | 738 | { |
d61d09de | 739 | c_can_object_get(dev, IF_RX, obj, priv->comm_rcv_high); |
2b9aecdc TG |
740 | } |
741 | ||
742 | static inline void c_can_rx_finalize(struct net_device *dev, | |
743 | struct c_can_priv *priv, u32 obj) | |
744 | { | |
d61d09de TG |
745 | if (priv->type != BOSCH_D_CAN) |
746 | c_can_object_get(dev, IF_RX, obj, IF_COMM_CLR_NEWDAT); | |
2b9aecdc TG |
747 | } |
748 | ||
520f570c TG |
749 | static int c_can_read_objects(struct net_device *dev, struct c_can_priv *priv, |
750 | u32 pend, int quota) | |
751 | { | |
2b9aecdc | 752 | u32 pkts = 0, ctrl, obj; |
520f570c TG |
753 | |
754 | while ((obj = ffs(pend)) && quota > 0) { | |
755 | pend &= ~BIT(obj - 1); | |
756 | ||
d61d09de | 757 | c_can_rx_object_get(dev, priv, obj); |
520f570c TG |
758 | ctrl = priv->read_reg(priv, C_CAN_IFACE(MSGCTRL_REG, IF_RX)); |
759 | ||
760 | if (ctrl & IF_MCONT_MSGLST) { | |
761 | int n = c_can_handle_lost_msg_obj(dev, IF_RX, obj, ctrl); | |
762 | ||
763 | pkts += n; | |
764 | quota -= n; | |
765 | continue; | |
766 | } | |
767 | ||
768 | /* | |
769 | * This really should not happen, but this covers some | |
770 | * odd HW behaviour. Do not remove that unless you | |
771 | * want to brick your machine. | |
772 | */ | |
773 | if (!(ctrl & IF_MCONT_NEWDAT)) | |
774 | continue; | |
775 | ||
776 | /* read the data from the message object */ | |
777 | c_can_read_msg_object(dev, IF_RX, ctrl); | |
778 | ||
2b9aecdc | 779 | c_can_rx_finalize(dev, priv, obj); |
520f570c TG |
780 | |
781 | pkts++; | |
782 | quota--; | |
783 | } | |
784 | ||
785 | return pkts; | |
881ff67a BS |
786 | } |
787 | ||
2b9aecdc TG |
788 | static inline u32 c_can_get_pending(struct c_can_priv *priv) |
789 | { | |
790 | u32 pend = priv->read_reg(priv, C_CAN_NEWDAT1_REG); | |
791 | ||
2b9aecdc TG |
792 | return pend; |
793 | } | |
794 | ||
881ff67a BS |
795 | /* |
796 | * theory of operation: | |
797 | * | |
798 | * c_can core saves a received CAN message into the first free message | |
799 | * object it finds free (starting with the lowest). Bits NEWDAT and | |
800 | * INTPND are set for this message object indicating that a new message | |
801 | * has arrived. To work-around this issue, we keep two groups of message | |
802 | * objects whose partitioning is defined by C_CAN_MSG_OBJ_RX_SPLIT. | |
803 | * | |
2b9aecdc TG |
804 | * We clear the newdat bit right away. |
805 | * | |
806 | * This can result in packet reordering when the readout is slow. | |
881ff67a BS |
807 | */ |
808 | static int c_can_do_rx_poll(struct net_device *dev, int quota) | |
809 | { | |
881ff67a | 810 | struct c_can_priv *priv = netdev_priv(dev); |
520f570c | 811 | u32 pkts = 0, pend = 0, toread, n; |
4ce78a83 MP |
812 | |
813 | /* | |
814 | * It is faster to read only one 16bit register. This is only possible | |
815 | * for a maximum number of 16 objects. | |
816 | */ | |
817 | BUILD_BUG_ON_MSG(C_CAN_MSG_OBJ_RX_LAST > 16, | |
818 | "Implementation does not support more message objects than 16"); | |
819 | ||
64f08f2f | 820 | while (quota > 0) { |
64f08f2f | 821 | if (!pend) { |
2b9aecdc | 822 | pend = c_can_get_pending(priv); |
64f08f2f | 823 | if (!pend) |
520f570c | 824 | break; |
64f08f2f TG |
825 | /* |
826 | * If the pending field has a gap, handle the | |
827 | * bits above the gap first. | |
828 | */ | |
520f570c | 829 | toread = c_can_adjust_pending(pend); |
64f08f2f | 830 | } else { |
520f570c | 831 | toread = pend; |
881ff67a | 832 | } |
64f08f2f | 833 | /* Remove the bits from pend */ |
520f570c TG |
834 | pend &= ~toread; |
835 | /* Read the objects */ | |
836 | n = c_can_read_objects(dev, priv, toread, quota); | |
837 | pkts += n; | |
838 | quota -= n; | |
881ff67a BS |
839 | } |
840 | ||
b1d8e431 TG |
841 | if (pkts) |
842 | can_led_event(dev, CAN_LED_EVENT_RX); | |
843 | ||
520f570c | 844 | return pkts; |
881ff67a BS |
845 | } |
846 | ||
881ff67a BS |
847 | static int c_can_handle_state_change(struct net_device *dev, |
848 | enum c_can_bus_error_types error_type) | |
849 | { | |
850 | unsigned int reg_err_counter; | |
851 | unsigned int rx_err_passive; | |
852 | struct c_can_priv *priv = netdev_priv(dev); | |
853 | struct net_device_stats *stats = &dev->stats; | |
854 | struct can_frame *cf; | |
855 | struct sk_buff *skb; | |
856 | struct can_berr_counter bec; | |
857 | ||
f058d548 TG |
858 | switch (error_type) { |
859 | case C_CAN_ERROR_WARNING: | |
860 | /* error warning state */ | |
861 | priv->can.can_stats.error_warning++; | |
862 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
863 | break; | |
864 | case C_CAN_ERROR_PASSIVE: | |
865 | /* error passive state */ | |
866 | priv->can.can_stats.error_passive++; | |
867 | priv->can.state = CAN_STATE_ERROR_PASSIVE; | |
868 | break; | |
869 | case C_CAN_BUS_OFF: | |
870 | /* bus-off state */ | |
871 | priv->can.state = CAN_STATE_BUS_OFF; | |
be38a6f9 | 872 | priv->can.can_stats.bus_off++; |
f058d548 TG |
873 | break; |
874 | default: | |
875 | break; | |
876 | } | |
877 | ||
25985edc | 878 | /* propagate the error condition to the CAN stack */ |
881ff67a BS |
879 | skb = alloc_can_err_skb(dev, &cf); |
880 | if (unlikely(!skb)) | |
881 | return 0; | |
882 | ||
e35d46ad | 883 | __c_can_get_berr_counter(dev, &bec); |
33f81009 | 884 | reg_err_counter = priv->read_reg(priv, C_CAN_ERR_CNT_REG); |
881ff67a BS |
885 | rx_err_passive = (reg_err_counter & ERR_CNT_RP_MASK) >> |
886 | ERR_CNT_RP_SHIFT; | |
887 | ||
888 | switch (error_type) { | |
889 | case C_CAN_ERROR_WARNING: | |
890 | /* error warning state */ | |
881ff67a BS |
891 | cf->can_id |= CAN_ERR_CRTL; |
892 | cf->data[1] = (bec.txerr > bec.rxerr) ? | |
893 | CAN_ERR_CRTL_TX_WARNING : | |
894 | CAN_ERR_CRTL_RX_WARNING; | |
895 | cf->data[6] = bec.txerr; | |
896 | cf->data[7] = bec.rxerr; | |
897 | ||
898 | break; | |
899 | case C_CAN_ERROR_PASSIVE: | |
900 | /* error passive state */ | |
881ff67a BS |
901 | cf->can_id |= CAN_ERR_CRTL; |
902 | if (rx_err_passive) | |
903 | cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; | |
904 | if (bec.txerr > 127) | |
905 | cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; | |
906 | ||
907 | cf->data[6] = bec.txerr; | |
908 | cf->data[7] = bec.rxerr; | |
909 | break; | |
910 | case C_CAN_BUS_OFF: | |
911 | /* bus-off state */ | |
881ff67a | 912 | cf->can_id |= CAN_ERR_BUSOFF; |
881ff67a BS |
913 | can_bus_off(dev); |
914 | break; | |
915 | default: | |
916 | break; | |
917 | } | |
918 | ||
881ff67a BS |
919 | stats->rx_packets++; |
920 | stats->rx_bytes += cf->can_dlc; | |
9c64863a | 921 | netif_receive_skb(skb); |
881ff67a BS |
922 | |
923 | return 1; | |
924 | } | |
925 | ||
926 | static int c_can_handle_bus_err(struct net_device *dev, | |
927 | enum c_can_lec_type lec_type) | |
928 | { | |
929 | struct c_can_priv *priv = netdev_priv(dev); | |
930 | struct net_device_stats *stats = &dev->stats; | |
931 | struct can_frame *cf; | |
932 | struct sk_buff *skb; | |
933 | ||
934 | /* | |
935 | * early exit if no lec update or no error. | |
936 | * no lec update means that no CAN bus event has been detected | |
937 | * since CPU wrote 0x7 value to status reg. | |
938 | */ | |
939 | if (lec_type == LEC_UNUSED || lec_type == LEC_NO_ERROR) | |
940 | return 0; | |
941 | ||
097aec19 TG |
942 | if (!(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) |
943 | return 0; | |
944 | ||
1da394d8 TG |
945 | /* common for all type of bus errors */ |
946 | priv->can.can_stats.bus_error++; | |
947 | stats->rx_errors++; | |
948 | ||
25985edc | 949 | /* propagate the error condition to the CAN stack */ |
881ff67a BS |
950 | skb = alloc_can_err_skb(dev, &cf); |
951 | if (unlikely(!skb)) | |
952 | return 0; | |
953 | ||
954 | /* | |
955 | * check for 'last error code' which tells us the | |
956 | * type of the last error to occur on the CAN bus | |
957 | */ | |
881ff67a BS |
958 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
959 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; | |
960 | ||
961 | switch (lec_type) { | |
962 | case LEC_STUFF_ERROR: | |
963 | netdev_dbg(dev, "stuff error\n"); | |
964 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
965 | break; | |
966 | case LEC_FORM_ERROR: | |
967 | netdev_dbg(dev, "form error\n"); | |
968 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
969 | break; | |
970 | case LEC_ACK_ERROR: | |
971 | netdev_dbg(dev, "ack error\n"); | |
6ea45886 | 972 | cf->data[3] |= (CAN_ERR_PROT_LOC_ACK | |
881ff67a BS |
973 | CAN_ERR_PROT_LOC_ACK_DEL); |
974 | break; | |
975 | case LEC_BIT1_ERROR: | |
976 | netdev_dbg(dev, "bit1 error\n"); | |
977 | cf->data[2] |= CAN_ERR_PROT_BIT1; | |
978 | break; | |
979 | case LEC_BIT0_ERROR: | |
980 | netdev_dbg(dev, "bit0 error\n"); | |
981 | cf->data[2] |= CAN_ERR_PROT_BIT0; | |
982 | break; | |
983 | case LEC_CRC_ERROR: | |
984 | netdev_dbg(dev, "CRC error\n"); | |
6ea45886 | 985 | cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ | |
881ff67a BS |
986 | CAN_ERR_PROT_LOC_CRC_DEL); |
987 | break; | |
988 | default: | |
989 | break; | |
990 | } | |
991 | ||
881ff67a BS |
992 | stats->rx_packets++; |
993 | stats->rx_bytes += cf->can_dlc; | |
9c64863a | 994 | netif_receive_skb(skb); |
881ff67a BS |
995 | return 1; |
996 | } | |
997 | ||
998 | static int c_can_poll(struct napi_struct *napi, int quota) | |
999 | { | |
881ff67a BS |
1000 | struct net_device *dev = napi->dev; |
1001 | struct c_can_priv *priv = netdev_priv(dev); | |
fa39b54c TG |
1002 | u16 curr, last = priv->last_status; |
1003 | int work_done = 0; | |
881ff67a | 1004 | |
fa39b54c TG |
1005 | priv->last_status = curr = priv->read_reg(priv, C_CAN_STS_REG); |
1006 | /* Ack status on C_CAN. D_CAN is self clearing */ | |
1007 | if (priv->type != BOSCH_D_CAN) | |
1008 | priv->write_reg(priv, C_CAN_STS_REG, LEC_UNUSED); | |
881ff67a | 1009 | |
fa39b54c TG |
1010 | /* handle state changes */ |
1011 | if ((curr & STATUS_EWARN) && (!(last & STATUS_EWARN))) { | |
1012 | netdev_dbg(dev, "entered error warning state\n"); | |
1013 | work_done += c_can_handle_state_change(dev, C_CAN_ERROR_WARNING); | |
1014 | } | |
881ff67a | 1015 | |
fa39b54c TG |
1016 | if ((curr & STATUS_EPASS) && (!(last & STATUS_EPASS))) { |
1017 | netdev_dbg(dev, "entered error passive state\n"); | |
1018 | work_done += c_can_handle_state_change(dev, C_CAN_ERROR_PASSIVE); | |
1019 | } | |
881ff67a | 1020 | |
fa39b54c TG |
1021 | if ((curr & STATUS_BOFF) && (!(last & STATUS_BOFF))) { |
1022 | netdev_dbg(dev, "entered bus off state\n"); | |
1023 | work_done += c_can_handle_state_change(dev, C_CAN_BUS_OFF); | |
1024 | goto end; | |
881ff67a BS |
1025 | } |
1026 | ||
fa39b54c TG |
1027 | /* handle bus recovery events */ |
1028 | if ((!(curr & STATUS_BOFF)) && (last & STATUS_BOFF)) { | |
1029 | netdev_dbg(dev, "left bus off state\n"); | |
1030 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
1031 | } | |
1032 | if ((!(curr & STATUS_EPASS)) && (last & STATUS_EPASS)) { | |
1033 | netdev_dbg(dev, "left error passive state\n"); | |
1034 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
1035 | } | |
1036 | ||
1037 | /* handle lec errors on the bus */ | |
1038 | work_done += c_can_handle_bus_err(dev, curr & LEC_MASK); | |
1039 | ||
1040 | /* Handle Tx/Rx events. We do this unconditionally */ | |
1041 | work_done += c_can_do_rx_poll(dev, (quota - work_done)); | |
1042 | c_can_do_tx(dev); | |
1043 | ||
881ff67a BS |
1044 | end: |
1045 | if (work_done < quota) { | |
1046 | napi_complete(napi); | |
ef1d2e28 TG |
1047 | /* enable all IRQs if we are not in bus off state */ |
1048 | if (priv->can.state != CAN_STATE_BUS_OFF) | |
2d5f4f85 | 1049 | c_can_irq_control(priv, true); |
881ff67a BS |
1050 | } |
1051 | ||
1052 | return work_done; | |
1053 | } | |
1054 | ||
1055 | static irqreturn_t c_can_isr(int irq, void *dev_id) | |
1056 | { | |
881ff67a BS |
1057 | struct net_device *dev = (struct net_device *)dev_id; |
1058 | struct c_can_priv *priv = netdev_priv(dev); | |
1059 | ||
fa39b54c | 1060 | if (!priv->read_reg(priv, C_CAN_INT_REG)) |
881ff67a BS |
1061 | return IRQ_NONE; |
1062 | ||
1063 | /* disable all interrupts and schedule the NAPI */ | |
2d5f4f85 | 1064 | c_can_irq_control(priv, false); |
881ff67a BS |
1065 | napi_schedule(&priv->napi); |
1066 | ||
1067 | return IRQ_HANDLED; | |
1068 | } | |
1069 | ||
1070 | static int c_can_open(struct net_device *dev) | |
1071 | { | |
1072 | int err; | |
1073 | struct c_can_priv *priv = netdev_priv(dev); | |
1074 | ||
4cdd34b2 | 1075 | c_can_pm_runtime_get_sync(priv); |
52cde85a | 1076 | c_can_reset_ram(priv, true); |
4cdd34b2 | 1077 | |
881ff67a BS |
1078 | /* open the can device */ |
1079 | err = open_candev(dev); | |
1080 | if (err) { | |
1081 | netdev_err(dev, "failed to open can device\n"); | |
4cdd34b2 | 1082 | goto exit_open_fail; |
881ff67a BS |
1083 | } |
1084 | ||
1085 | /* register interrupt handler */ | |
1086 | err = request_irq(dev->irq, &c_can_isr, IRQF_SHARED, dev->name, | |
1087 | dev); | |
1088 | if (err < 0) { | |
1089 | netdev_err(dev, "failed to request interrupt\n"); | |
1090 | goto exit_irq_fail; | |
1091 | } | |
1092 | ||
130a5171 MKB |
1093 | /* start the c_can controller */ |
1094 | err = c_can_start(dev); | |
1095 | if (err) | |
1096 | goto exit_start_fail; | |
f461f27a | 1097 | |
5090f805 FB |
1098 | can_led_event(dev, CAN_LED_EVENT_OPEN); |
1099 | ||
130a5171 | 1100 | napi_enable(&priv->napi); |
bed11db3 | 1101 | /* enable status change, error and module interrupts */ |
2d5f4f85 | 1102 | c_can_irq_control(priv, true); |
881ff67a BS |
1103 | netif_start_queue(dev); |
1104 | ||
1105 | return 0; | |
1106 | ||
130a5171 MKB |
1107 | exit_start_fail: |
1108 | free_irq(dev->irq, dev); | |
881ff67a BS |
1109 | exit_irq_fail: |
1110 | close_candev(dev); | |
4cdd34b2 | 1111 | exit_open_fail: |
52cde85a | 1112 | c_can_reset_ram(priv, false); |
4cdd34b2 | 1113 | c_can_pm_runtime_put_sync(priv); |
881ff67a BS |
1114 | return err; |
1115 | } | |
1116 | ||
1117 | static int c_can_close(struct net_device *dev) | |
1118 | { | |
1119 | struct c_can_priv *priv = netdev_priv(dev); | |
1120 | ||
1121 | netif_stop_queue(dev); | |
1122 | napi_disable(&priv->napi); | |
1123 | c_can_stop(dev); | |
1124 | free_irq(dev->irq, dev); | |
1125 | close_candev(dev); | |
52cde85a AC |
1126 | |
1127 | c_can_reset_ram(priv, false); | |
4cdd34b2 | 1128 | c_can_pm_runtime_put_sync(priv); |
881ff67a | 1129 | |
5090f805 FB |
1130 | can_led_event(dev, CAN_LED_EVENT_STOP); |
1131 | ||
881ff67a BS |
1132 | return 0; |
1133 | } | |
1134 | ||
1135 | struct net_device *alloc_c_can_dev(void) | |
1136 | { | |
1137 | struct net_device *dev; | |
1138 | struct c_can_priv *priv; | |
1139 | ||
1140 | dev = alloc_candev(sizeof(struct c_can_priv), C_CAN_MSG_OBJ_TX_NUM); | |
1141 | if (!dev) | |
1142 | return NULL; | |
1143 | ||
1144 | priv = netdev_priv(dev); | |
1145 | netif_napi_add(dev, &priv->napi, c_can_poll, C_CAN_NAPI_WEIGHT); | |
1146 | ||
1147 | priv->dev = dev; | |
1148 | priv->can.bittiming_const = &c_can_bittiming_const; | |
1149 | priv->can.do_set_mode = c_can_set_mode; | |
1150 | priv->can.do_get_berr_counter = c_can_get_berr_counter; | |
ee6f0988 | 1151 | priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | |
881ff67a BS |
1152 | CAN_CTRLMODE_LISTENONLY | |
1153 | CAN_CTRLMODE_BERR_REPORTING; | |
1154 | ||
1155 | return dev; | |
1156 | } | |
1157 | EXPORT_SYMBOL_GPL(alloc_c_can_dev); | |
1158 | ||
82120032 AC |
1159 | #ifdef CONFIG_PM |
1160 | int c_can_power_down(struct net_device *dev) | |
1161 | { | |
1162 | u32 val; | |
1163 | unsigned long time_out; | |
1164 | struct c_can_priv *priv = netdev_priv(dev); | |
1165 | ||
1166 | if (!(dev->flags & IFF_UP)) | |
1167 | return 0; | |
1168 | ||
1169 | WARN_ON(priv->type != BOSCH_D_CAN); | |
1170 | ||
1171 | /* set PDR value so the device goes to power down mode */ | |
1172 | val = priv->read_reg(priv, C_CAN_CTRL_EX_REG); | |
1173 | val |= CONTROL_EX_PDR; | |
1174 | priv->write_reg(priv, C_CAN_CTRL_EX_REG, val); | |
1175 | ||
1176 | /* Wait for the PDA bit to get set */ | |
1177 | time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS); | |
1178 | while (!(priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) && | |
1179 | time_after(time_out, jiffies)) | |
1180 | cpu_relax(); | |
1181 | ||
1182 | if (time_after(jiffies, time_out)) | |
1183 | return -ETIMEDOUT; | |
1184 | ||
1185 | c_can_stop(dev); | |
1186 | ||
52cde85a | 1187 | c_can_reset_ram(priv, false); |
82120032 AC |
1188 | c_can_pm_runtime_put_sync(priv); |
1189 | ||
1190 | return 0; | |
1191 | } | |
1192 | EXPORT_SYMBOL_GPL(c_can_power_down); | |
1193 | ||
1194 | int c_can_power_up(struct net_device *dev) | |
1195 | { | |
1196 | u32 val; | |
1197 | unsigned long time_out; | |
1198 | struct c_can_priv *priv = netdev_priv(dev); | |
bed11db3 | 1199 | int ret; |
82120032 AC |
1200 | |
1201 | if (!(dev->flags & IFF_UP)) | |
1202 | return 0; | |
1203 | ||
1204 | WARN_ON(priv->type != BOSCH_D_CAN); | |
1205 | ||
1206 | c_can_pm_runtime_get_sync(priv); | |
52cde85a | 1207 | c_can_reset_ram(priv, true); |
82120032 AC |
1208 | |
1209 | /* Clear PDR and INIT bits */ | |
1210 | val = priv->read_reg(priv, C_CAN_CTRL_EX_REG); | |
1211 | val &= ~CONTROL_EX_PDR; | |
1212 | priv->write_reg(priv, C_CAN_CTRL_EX_REG, val); | |
1213 | val = priv->read_reg(priv, C_CAN_CTRL_REG); | |
1214 | val &= ~CONTROL_INIT; | |
1215 | priv->write_reg(priv, C_CAN_CTRL_REG, val); | |
1216 | ||
1217 | /* Wait for the PDA bit to get clear */ | |
1218 | time_out = jiffies + msecs_to_jiffies(INIT_WAIT_MS); | |
1219 | while ((priv->read_reg(priv, C_CAN_STS_REG) & STATUS_PDA) && | |
1220 | time_after(time_out, jiffies)) | |
1221 | cpu_relax(); | |
1222 | ||
1223 | if (time_after(jiffies, time_out)) | |
1224 | return -ETIMEDOUT; | |
1225 | ||
bed11db3 TG |
1226 | ret = c_can_start(dev); |
1227 | if (!ret) | |
2d5f4f85 | 1228 | c_can_irq_control(priv, true); |
bed11db3 TG |
1229 | |
1230 | return ret; | |
82120032 AC |
1231 | } |
1232 | EXPORT_SYMBOL_GPL(c_can_power_up); | |
1233 | #endif | |
1234 | ||
881ff67a BS |
1235 | void free_c_can_dev(struct net_device *dev) |
1236 | { | |
f29b4238 MKB |
1237 | struct c_can_priv *priv = netdev_priv(dev); |
1238 | ||
1239 | netif_napi_del(&priv->napi); | |
881ff67a BS |
1240 | free_candev(dev); |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(free_c_can_dev); | |
1243 | ||
1244 | static const struct net_device_ops c_can_netdev_ops = { | |
1245 | .ndo_open = c_can_open, | |
1246 | .ndo_stop = c_can_close, | |
1247 | .ndo_start_xmit = c_can_start_xmit, | |
c971fa2a | 1248 | .ndo_change_mtu = can_change_mtu, |
881ff67a BS |
1249 | }; |
1250 | ||
1251 | int register_c_can_dev(struct net_device *dev) | |
1252 | { | |
4cdd34b2 AC |
1253 | struct c_can_priv *priv = netdev_priv(dev); |
1254 | int err; | |
1255 | ||
3973c526 RQ |
1256 | /* Deactivate pins to prevent DRA7 DCAN IP from being |
1257 | * stuck in transition when module is disabled. | |
1258 | * Pins are activated in c_can_start() and deactivated | |
1259 | * in c_can_stop() | |
1260 | */ | |
1261 | pinctrl_pm_select_sleep_state(dev->dev.parent); | |
1262 | ||
4cdd34b2 AC |
1263 | c_can_pm_runtime_enable(priv); |
1264 | ||
881ff67a BS |
1265 | dev->flags |= IFF_ECHO; /* we support local echo */ |
1266 | dev->netdev_ops = &c_can_netdev_ops; | |
1267 | ||
4cdd34b2 AC |
1268 | err = register_candev(dev); |
1269 | if (err) | |
1270 | c_can_pm_runtime_disable(priv); | |
5090f805 FB |
1271 | else |
1272 | devm_can_led_init(dev); | |
4cdd34b2 AC |
1273 | |
1274 | return err; | |
881ff67a BS |
1275 | } |
1276 | EXPORT_SYMBOL_GPL(register_c_can_dev); | |
1277 | ||
1278 | void unregister_c_can_dev(struct net_device *dev) | |
1279 | { | |
1280 | struct c_can_priv *priv = netdev_priv(dev); | |
1281 | ||
881ff67a | 1282 | unregister_candev(dev); |
4cdd34b2 AC |
1283 | |
1284 | c_can_pm_runtime_disable(priv); | |
881ff67a BS |
1285 | } |
1286 | EXPORT_SYMBOL_GPL(unregister_c_can_dev); | |
1287 | ||
1288 | MODULE_AUTHOR("Bhupesh Sharma <bhupesh.sharma@st.com>"); | |
1289 | MODULE_LICENSE("GPL v2"); | |
1290 | MODULE_DESCRIPTION("CAN bus driver for Bosch C_CAN controller"); |