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e0000163 CP |
1 | /* |
2 | * CAN bus driver for Microchip 251x CAN Controller with SPI Interface | |
3 | * | |
4 | * MCP2510 support and bug fixes by Christian Pellegrin | |
5 | * <chripell@evolware.org> | |
6 | * | |
7 | * Copyright 2009 Christian Pellegrin EVOL S.r.l. | |
8 | * | |
9 | * Copyright 2007 Raymarine UK, Ltd. All Rights Reserved. | |
10 | * Written under contract by: | |
11 | * Chris Elston, Katalix Systems, Ltd. | |
12 | * | |
13 | * Based on Microchip MCP251x CAN controller driver written by | |
14 | * David Vrabel, Copyright 2006 Arcom Control Systems Ltd. | |
15 | * | |
16 | * Based on CAN bus driver for the CCAN controller written by | |
17 | * - Sascha Hauer, Marc Kleine-Budde, Pengutronix | |
18 | * - Simon Kallweit, intefo AG | |
19 | * Copyright 2007 | |
20 | * | |
21 | * This program is free software; you can redistribute it and/or modify | |
22 | * it under the terms of the version 2 of the GNU General Public License | |
23 | * as published by the Free Software Foundation | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
05780d98 | 31 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
e0000163 CP |
32 | * |
33 | * | |
34 | * | |
35 | * Your platform definition file should specify something like: | |
36 | * | |
37 | * static struct mcp251x_platform_data mcp251x_info = { | |
38 | * .oscillator_frequency = 8000000, | |
e0000163 CP |
39 | * }; |
40 | * | |
41 | * static struct spi_board_info spi_board_info[] = { | |
42 | * { | |
f1f8c6cb MKB |
43 | * .modalias = "mcp2510", |
44 | * // or "mcp2515" depending on your controller | |
e0000163 CP |
45 | * .platform_data = &mcp251x_info, |
46 | * .irq = IRQ_EINT13, | |
47 | * .max_speed_hz = 2*1000*1000, | |
48 | * .chip_select = 2, | |
49 | * }, | |
50 | * }; | |
51 | * | |
52 | * Please see mcp251x.h for a description of the fields in | |
53 | * struct mcp251x_platform_data. | |
54 | * | |
55 | */ | |
56 | ||
e0000163 CP |
57 | #include <linux/can/core.h> |
58 | #include <linux/can/dev.h> | |
eb072a9b | 59 | #include <linux/can/led.h> |
e0000163 | 60 | #include <linux/can/platform/mcp251x.h> |
66606aaf | 61 | #include <linux/clk.h> |
e0000163 CP |
62 | #include <linux/completion.h> |
63 | #include <linux/delay.h> | |
64 | #include <linux/device.h> | |
65 | #include <linux/dma-mapping.h> | |
66 | #include <linux/freezer.h> | |
67 | #include <linux/interrupt.h> | |
68 | #include <linux/io.h> | |
69 | #include <linux/kernel.h> | |
70 | #include <linux/module.h> | |
71 | #include <linux/netdevice.h> | |
66606aaf AS |
72 | #include <linux/of.h> |
73 | #include <linux/of_device.h> | |
e0000163 | 74 | #include <linux/platform_device.h> |
5a0e3ad6 | 75 | #include <linux/slab.h> |
e0000163 CP |
76 | #include <linux/spi/spi.h> |
77 | #include <linux/uaccess.h> | |
1ddff7da | 78 | #include <linux/regulator/consumer.h> |
e0000163 CP |
79 | |
80 | /* SPI interface instruction set */ | |
81 | #define INSTRUCTION_WRITE 0x02 | |
82 | #define INSTRUCTION_READ 0x03 | |
83 | #define INSTRUCTION_BIT_MODIFY 0x05 | |
84 | #define INSTRUCTION_LOAD_TXB(n) (0x40 + 2 * (n)) | |
85 | #define INSTRUCTION_READ_RXB(n) (((n) == 0) ? 0x90 : 0x94) | |
86 | #define INSTRUCTION_RESET 0xC0 | |
cab32f39 BL |
87 | #define RTS_TXB0 0x01 |
88 | #define RTS_TXB1 0x02 | |
89 | #define RTS_TXB2 0x04 | |
90 | #define INSTRUCTION_RTS(n) (0x80 | ((n) & 0x07)) | |
91 | ||
e0000163 CP |
92 | |
93 | /* MPC251x registers */ | |
94 | #define CANSTAT 0x0e | |
95 | #define CANCTRL 0x0f | |
96 | # define CANCTRL_REQOP_MASK 0xe0 | |
97 | # define CANCTRL_REQOP_CONF 0x80 | |
98 | # define CANCTRL_REQOP_LISTEN_ONLY 0x60 | |
99 | # define CANCTRL_REQOP_LOOPBACK 0x40 | |
100 | # define CANCTRL_REQOP_SLEEP 0x20 | |
101 | # define CANCTRL_REQOP_NORMAL 0x00 | |
102 | # define CANCTRL_OSM 0x08 | |
103 | # define CANCTRL_ABAT 0x10 | |
104 | #define TEC 0x1c | |
105 | #define REC 0x1d | |
106 | #define CNF1 0x2a | |
107 | # define CNF1_SJW_SHIFT 6 | |
108 | #define CNF2 0x29 | |
109 | # define CNF2_BTLMODE 0x80 | |
110 | # define CNF2_SAM 0x40 | |
111 | # define CNF2_PS1_SHIFT 3 | |
112 | #define CNF3 0x28 | |
113 | # define CNF3_SOF 0x08 | |
114 | # define CNF3_WAKFIL 0x04 | |
115 | # define CNF3_PHSEG2_MASK 0x07 | |
116 | #define CANINTE 0x2b | |
117 | # define CANINTE_MERRE 0x80 | |
118 | # define CANINTE_WAKIE 0x40 | |
119 | # define CANINTE_ERRIE 0x20 | |
120 | # define CANINTE_TX2IE 0x10 | |
121 | # define CANINTE_TX1IE 0x08 | |
122 | # define CANINTE_TX0IE 0x04 | |
123 | # define CANINTE_RX1IE 0x02 | |
124 | # define CANINTE_RX0IE 0x01 | |
125 | #define CANINTF 0x2c | |
126 | # define CANINTF_MERRF 0x80 | |
127 | # define CANINTF_WAKIF 0x40 | |
128 | # define CANINTF_ERRIF 0x20 | |
129 | # define CANINTF_TX2IF 0x10 | |
130 | # define CANINTF_TX1IF 0x08 | |
131 | # define CANINTF_TX0IF 0x04 | |
132 | # define CANINTF_RX1IF 0x02 | |
133 | # define CANINTF_RX0IF 0x01 | |
5601b2df MKB |
134 | # define CANINTF_RX (CANINTF_RX0IF | CANINTF_RX1IF) |
135 | # define CANINTF_TX (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF) | |
136 | # define CANINTF_ERR (CANINTF_ERRIF) | |
e0000163 CP |
137 | #define EFLG 0x2d |
138 | # define EFLG_EWARN 0x01 | |
139 | # define EFLG_RXWAR 0x02 | |
140 | # define EFLG_TXWAR 0x04 | |
141 | # define EFLG_RXEP 0x08 | |
142 | # define EFLG_TXEP 0x10 | |
143 | # define EFLG_TXBO 0x20 | |
144 | # define EFLG_RX0OVR 0x40 | |
145 | # define EFLG_RX1OVR 0x80 | |
146 | #define TXBCTRL(n) (((n) * 0x10) + 0x30 + TXBCTRL_OFF) | |
147 | # define TXBCTRL_ABTF 0x40 | |
148 | # define TXBCTRL_MLOA 0x20 | |
149 | # define TXBCTRL_TXERR 0x10 | |
150 | # define TXBCTRL_TXREQ 0x08 | |
151 | #define TXBSIDH(n) (((n) * 0x10) + 0x30 + TXBSIDH_OFF) | |
152 | # define SIDH_SHIFT 3 | |
153 | #define TXBSIDL(n) (((n) * 0x10) + 0x30 + TXBSIDL_OFF) | |
154 | # define SIDL_SID_MASK 7 | |
155 | # define SIDL_SID_SHIFT 5 | |
156 | # define SIDL_EXIDE_SHIFT 3 | |
157 | # define SIDL_EID_SHIFT 16 | |
158 | # define SIDL_EID_MASK 3 | |
159 | #define TXBEID8(n) (((n) * 0x10) + 0x30 + TXBEID8_OFF) | |
160 | #define TXBEID0(n) (((n) * 0x10) + 0x30 + TXBEID0_OFF) | |
161 | #define TXBDLC(n) (((n) * 0x10) + 0x30 + TXBDLC_OFF) | |
162 | # define DLC_RTR_SHIFT 6 | |
163 | #define TXBCTRL_OFF 0 | |
164 | #define TXBSIDH_OFF 1 | |
165 | #define TXBSIDL_OFF 2 | |
166 | #define TXBEID8_OFF 3 | |
167 | #define TXBEID0_OFF 4 | |
168 | #define TXBDLC_OFF 5 | |
169 | #define TXBDAT_OFF 6 | |
170 | #define RXBCTRL(n) (((n) * 0x10) + 0x60 + RXBCTRL_OFF) | |
171 | # define RXBCTRL_BUKT 0x04 | |
172 | # define RXBCTRL_RXM0 0x20 | |
173 | # define RXBCTRL_RXM1 0x40 | |
174 | #define RXBSIDH(n) (((n) * 0x10) + 0x60 + RXBSIDH_OFF) | |
175 | # define RXBSIDH_SHIFT 3 | |
176 | #define RXBSIDL(n) (((n) * 0x10) + 0x60 + RXBSIDL_OFF) | |
177 | # define RXBSIDL_IDE 0x08 | |
b9958a95 | 178 | # define RXBSIDL_SRR 0x10 |
e0000163 CP |
179 | # define RXBSIDL_EID 3 |
180 | # define RXBSIDL_SHIFT 5 | |
181 | #define RXBEID8(n) (((n) * 0x10) + 0x60 + RXBEID8_OFF) | |
182 | #define RXBEID0(n) (((n) * 0x10) + 0x60 + RXBEID0_OFF) | |
183 | #define RXBDLC(n) (((n) * 0x10) + 0x60 + RXBDLC_OFF) | |
184 | # define RXBDLC_LEN_MASK 0x0f | |
185 | # define RXBDLC_RTR 0x40 | |
186 | #define RXBCTRL_OFF 0 | |
187 | #define RXBSIDH_OFF 1 | |
188 | #define RXBSIDL_OFF 2 | |
189 | #define RXBEID8_OFF 3 | |
190 | #define RXBEID0_OFF 4 | |
191 | #define RXBDLC_OFF 5 | |
192 | #define RXBDAT_OFF 6 | |
bf66f373 CP |
193 | #define RXFSIDH(n) ((n) * 4) |
194 | #define RXFSIDL(n) ((n) * 4 + 1) | |
195 | #define RXFEID8(n) ((n) * 4 + 2) | |
196 | #define RXFEID0(n) ((n) * 4 + 3) | |
197 | #define RXMSIDH(n) ((n) * 4 + 0x20) | |
198 | #define RXMSIDL(n) ((n) * 4 + 0x21) | |
199 | #define RXMEID8(n) ((n) * 4 + 0x22) | |
200 | #define RXMEID0(n) ((n) * 4 + 0x23) | |
e0000163 CP |
201 | |
202 | #define GET_BYTE(val, byte) \ | |
203 | (((val) >> ((byte) * 8)) & 0xff) | |
204 | #define SET_BYTE(val, byte) \ | |
205 | (((val) & 0xff) << ((byte) * 8)) | |
206 | ||
207 | /* | |
208 | * Buffer size required for the largest SPI transfer (i.e., reading a | |
209 | * frame) | |
210 | */ | |
211 | #define CAN_FRAME_MAX_DATA_LEN 8 | |
212 | #define SPI_TRANSFER_BUF_LEN (6 + CAN_FRAME_MAX_DATA_LEN) | |
213 | #define CAN_FRAME_MAX_BITS 128 | |
214 | ||
215 | #define TX_ECHO_SKB_MAX 1 | |
216 | ||
217 | #define DEVICE_NAME "mcp251x" | |
218 | ||
219 | static int mcp251x_enable_dma; /* Enable SPI DMA. Default: 0 (Off) */ | |
220 | module_param(mcp251x_enable_dma, int, S_IRUGO); | |
221 | MODULE_PARM_DESC(mcp251x_enable_dma, "Enable SPI DMA. Default: 0 (Off)"); | |
222 | ||
194b9a4c | 223 | static const struct can_bittiming_const mcp251x_bittiming_const = { |
e0000163 CP |
224 | .name = DEVICE_NAME, |
225 | .tseg1_min = 3, | |
226 | .tseg1_max = 16, | |
227 | .tseg2_min = 2, | |
228 | .tseg2_max = 8, | |
229 | .sjw_max = 4, | |
230 | .brp_min = 1, | |
231 | .brp_max = 64, | |
232 | .brp_inc = 1, | |
233 | }; | |
234 | ||
f1f8c6cb MKB |
235 | enum mcp251x_model { |
236 | CAN_MCP251X_MCP2510 = 0x2510, | |
237 | CAN_MCP251X_MCP2515 = 0x2515, | |
238 | }; | |
239 | ||
e0000163 CP |
240 | struct mcp251x_priv { |
241 | struct can_priv can; | |
242 | struct net_device *net; | |
243 | struct spi_device *spi; | |
f1f8c6cb | 244 | enum mcp251x_model model; |
e0000163 | 245 | |
bf66f373 CP |
246 | struct mutex mcp_lock; /* SPI device lock */ |
247 | ||
e0000163 CP |
248 | u8 *spi_tx_buf; |
249 | u8 *spi_rx_buf; | |
250 | dma_addr_t spi_tx_dma; | |
251 | dma_addr_t spi_rx_dma; | |
252 | ||
253 | struct sk_buff *tx_skb; | |
254 | int tx_len; | |
bf66f373 | 255 | |
e0000163 CP |
256 | struct workqueue_struct *wq; |
257 | struct work_struct tx_work; | |
bf66f373 CP |
258 | struct work_struct restart_work; |
259 | ||
e0000163 CP |
260 | int force_quit; |
261 | int after_suspend; | |
262 | #define AFTER_SUSPEND_UP 1 | |
263 | #define AFTER_SUSPEND_DOWN 2 | |
264 | #define AFTER_SUSPEND_POWER 4 | |
265 | #define AFTER_SUSPEND_RESTART 8 | |
266 | int restart_tx; | |
1ddff7da AS |
267 | struct regulator *power; |
268 | struct regulator *transceiver; | |
66606aaf | 269 | struct clk *clk; |
e0000163 CP |
270 | }; |
271 | ||
beab675c MKB |
272 | #define MCP251X_IS(_model) \ |
273 | static inline int mcp251x_is_##_model(struct spi_device *spi) \ | |
274 | { \ | |
fce5c293 | 275 | struct mcp251x_priv *priv = spi_get_drvdata(spi); \ |
beab675c MKB |
276 | return priv->model == CAN_MCP251X_MCP##_model; \ |
277 | } | |
278 | ||
279 | MCP251X_IS(2510); | |
280 | MCP251X_IS(2515); | |
281 | ||
e0000163 CP |
282 | static void mcp251x_clean(struct net_device *net) |
283 | { | |
284 | struct mcp251x_priv *priv = netdev_priv(net); | |
285 | ||
bf66f373 CP |
286 | if (priv->tx_skb || priv->tx_len) |
287 | net->stats.tx_errors++; | |
e0000163 CP |
288 | if (priv->tx_skb) |
289 | dev_kfree_skb(priv->tx_skb); | |
290 | if (priv->tx_len) | |
291 | can_free_echo_skb(priv->net, 0); | |
292 | priv->tx_skb = NULL; | |
293 | priv->tx_len = 0; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Note about handling of error return of mcp251x_spi_trans: accessing | |
298 | * registers via SPI is not really different conceptually than using | |
299 | * normal I/O assembler instructions, although it's much more | |
300 | * complicated from a practical POV. So it's not advisable to always | |
301 | * check the return value of this function. Imagine that every | |
302 | * read{b,l}, write{b,l} and friends would be bracketed in "if ( < 0) | |
303 | * error();", it would be a great mess (well there are some situation | |
304 | * when exception handling C++ like could be useful after all). So we | |
305 | * just check that transfers are OK at the beginning of our | |
306 | * conversation with the chip and to avoid doing really nasty things | |
307 | * (like injecting bogus packets in the network stack). | |
308 | */ | |
309 | static int mcp251x_spi_trans(struct spi_device *spi, int len) | |
310 | { | |
fce5c293 | 311 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
312 | struct spi_transfer t = { |
313 | .tx_buf = priv->spi_tx_buf, | |
314 | .rx_buf = priv->spi_rx_buf, | |
315 | .len = len, | |
316 | .cs_change = 0, | |
317 | }; | |
318 | struct spi_message m; | |
319 | int ret; | |
320 | ||
321 | spi_message_init(&m); | |
322 | ||
323 | if (mcp251x_enable_dma) { | |
324 | t.tx_dma = priv->spi_tx_dma; | |
325 | t.rx_dma = priv->spi_rx_dma; | |
326 | m.is_dma_mapped = 1; | |
327 | } | |
328 | ||
329 | spi_message_add_tail(&t, &m); | |
330 | ||
331 | ret = spi_sync(spi, &m); | |
332 | if (ret) | |
333 | dev_err(&spi->dev, "spi transfer failed: ret = %d\n", ret); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg) | |
338 | { | |
fce5c293 | 339 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
340 | u8 val = 0; |
341 | ||
e0000163 CP |
342 | priv->spi_tx_buf[0] = INSTRUCTION_READ; |
343 | priv->spi_tx_buf[1] = reg; | |
344 | ||
345 | mcp251x_spi_trans(spi, 3); | |
346 | val = priv->spi_rx_buf[2]; | |
347 | ||
e0000163 CP |
348 | return val; |
349 | } | |
350 | ||
f3a3ed31 SH |
351 | static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg, |
352 | uint8_t *v1, uint8_t *v2) | |
353 | { | |
fce5c293 | 354 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
f3a3ed31 SH |
355 | |
356 | priv->spi_tx_buf[0] = INSTRUCTION_READ; | |
357 | priv->spi_tx_buf[1] = reg; | |
358 | ||
359 | mcp251x_spi_trans(spi, 4); | |
360 | ||
361 | *v1 = priv->spi_rx_buf[2]; | |
362 | *v2 = priv->spi_rx_buf[3]; | |
363 | } | |
364 | ||
e0000163 CP |
365 | static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val) |
366 | { | |
fce5c293 | 367 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 | 368 | |
e0000163 CP |
369 | priv->spi_tx_buf[0] = INSTRUCTION_WRITE; |
370 | priv->spi_tx_buf[1] = reg; | |
371 | priv->spi_tx_buf[2] = val; | |
372 | ||
373 | mcp251x_spi_trans(spi, 3); | |
e0000163 CP |
374 | } |
375 | ||
376 | static void mcp251x_write_bits(struct spi_device *spi, u8 reg, | |
377 | u8 mask, uint8_t val) | |
378 | { | |
fce5c293 | 379 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 | 380 | |
e0000163 CP |
381 | priv->spi_tx_buf[0] = INSTRUCTION_BIT_MODIFY; |
382 | priv->spi_tx_buf[1] = reg; | |
383 | priv->spi_tx_buf[2] = mask; | |
384 | priv->spi_tx_buf[3] = val; | |
385 | ||
386 | mcp251x_spi_trans(spi, 4); | |
e0000163 CP |
387 | } |
388 | ||
389 | static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf, | |
390 | int len, int tx_buf_idx) | |
391 | { | |
fce5c293 | 392 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 | 393 | |
beab675c | 394 | if (mcp251x_is_2510(spi)) { |
e0000163 CP |
395 | int i; |
396 | ||
397 | for (i = 1; i < TXBDAT_OFF + len; i++) | |
398 | mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx) + i, | |
399 | buf[i]); | |
400 | } else { | |
e0000163 CP |
401 | memcpy(priv->spi_tx_buf, buf, TXBDAT_OFF + len); |
402 | mcp251x_spi_trans(spi, TXBDAT_OFF + len); | |
e0000163 CP |
403 | } |
404 | } | |
405 | ||
406 | static void mcp251x_hw_tx(struct spi_device *spi, struct can_frame *frame, | |
407 | int tx_buf_idx) | |
408 | { | |
fce5c293 | 409 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
410 | u32 sid, eid, exide, rtr; |
411 | u8 buf[SPI_TRANSFER_BUF_LEN]; | |
412 | ||
413 | exide = (frame->can_id & CAN_EFF_FLAG) ? 1 : 0; /* Extended ID Enable */ | |
414 | if (exide) | |
415 | sid = (frame->can_id & CAN_EFF_MASK) >> 18; | |
416 | else | |
417 | sid = frame->can_id & CAN_SFF_MASK; /* Standard ID */ | |
418 | eid = frame->can_id & CAN_EFF_MASK; /* Extended ID */ | |
419 | rtr = (frame->can_id & CAN_RTR_FLAG) ? 1 : 0; /* Remote transmission */ | |
420 | ||
421 | buf[TXBCTRL_OFF] = INSTRUCTION_LOAD_TXB(tx_buf_idx); | |
422 | buf[TXBSIDH_OFF] = sid >> SIDH_SHIFT; | |
423 | buf[TXBSIDL_OFF] = ((sid & SIDL_SID_MASK) << SIDL_SID_SHIFT) | | |
424 | (exide << SIDL_EXIDE_SHIFT) | | |
425 | ((eid >> SIDL_EID_SHIFT) & SIDL_EID_MASK); | |
426 | buf[TXBEID8_OFF] = GET_BYTE(eid, 1); | |
427 | buf[TXBEID0_OFF] = GET_BYTE(eid, 0); | |
428 | buf[TXBDLC_OFF] = (rtr << DLC_RTR_SHIFT) | frame->can_dlc; | |
429 | memcpy(buf + TXBDAT_OFF, frame->data, frame->can_dlc); | |
430 | mcp251x_hw_tx_frame(spi, buf, frame->can_dlc, tx_buf_idx); | |
cab32f39 BL |
431 | |
432 | /* use INSTRUCTION_RTS, to avoid "repeated frame problem" */ | |
433 | priv->spi_tx_buf[0] = INSTRUCTION_RTS(1 << tx_buf_idx); | |
434 | mcp251x_spi_trans(priv->spi, 1); | |
e0000163 CP |
435 | } |
436 | ||
437 | static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf, | |
438 | int buf_idx) | |
439 | { | |
fce5c293 | 440 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 | 441 | |
beab675c | 442 | if (mcp251x_is_2510(spi)) { |
e0000163 CP |
443 | int i, len; |
444 | ||
445 | for (i = 1; i < RXBDAT_OFF; i++) | |
446 | buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i); | |
c7cd606f OH |
447 | |
448 | len = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK); | |
e0000163 CP |
449 | for (; i < (RXBDAT_OFF + len); i++) |
450 | buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i); | |
451 | } else { | |
e0000163 CP |
452 | priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx); |
453 | mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN); | |
454 | memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN); | |
e0000163 CP |
455 | } |
456 | } | |
457 | ||
458 | static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx) | |
459 | { | |
fce5c293 | 460 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
461 | struct sk_buff *skb; |
462 | struct can_frame *frame; | |
463 | u8 buf[SPI_TRANSFER_BUF_LEN]; | |
464 | ||
465 | skb = alloc_can_skb(priv->net, &frame); | |
466 | if (!skb) { | |
467 | dev_err(&spi->dev, "cannot allocate RX skb\n"); | |
468 | priv->net->stats.rx_dropped++; | |
469 | return; | |
470 | } | |
471 | ||
472 | mcp251x_hw_rx_frame(spi, buf, buf_idx); | |
473 | if (buf[RXBSIDL_OFF] & RXBSIDL_IDE) { | |
474 | /* Extended ID format */ | |
475 | frame->can_id = CAN_EFF_FLAG; | |
476 | frame->can_id |= | |
477 | /* Extended ID part */ | |
478 | SET_BYTE(buf[RXBSIDL_OFF] & RXBSIDL_EID, 2) | | |
479 | SET_BYTE(buf[RXBEID8_OFF], 1) | | |
480 | SET_BYTE(buf[RXBEID0_OFF], 0) | | |
481 | /* Standard ID part */ | |
482 | (((buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) | | |
483 | (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT)) << 18); | |
484 | /* Remote transmission request */ | |
485 | if (buf[RXBDLC_OFF] & RXBDLC_RTR) | |
486 | frame->can_id |= CAN_RTR_FLAG; | |
487 | } else { | |
488 | /* Standard ID format */ | |
489 | frame->can_id = | |
490 | (buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) | | |
491 | (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT); | |
b9958a95 MKB |
492 | if (buf[RXBSIDL_OFF] & RXBSIDL_SRR) |
493 | frame->can_id |= CAN_RTR_FLAG; | |
e0000163 CP |
494 | } |
495 | /* Data length */ | |
c7cd606f | 496 | frame->can_dlc = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK); |
e0000163 CP |
497 | memcpy(frame->data, buf + RXBDAT_OFF, frame->can_dlc); |
498 | ||
499 | priv->net->stats.rx_packets++; | |
500 | priv->net->stats.rx_bytes += frame->can_dlc; | |
eb072a9b FB |
501 | |
502 | can_led_event(priv->net, CAN_LED_EVENT_RX); | |
503 | ||
57d3c7b0 | 504 | netif_rx_ni(skb); |
e0000163 CP |
505 | } |
506 | ||
507 | static void mcp251x_hw_sleep(struct spi_device *spi) | |
508 | { | |
509 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_SLEEP); | |
510 | } | |
511 | ||
e0000163 CP |
512 | static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb, |
513 | struct net_device *net) | |
514 | { | |
515 | struct mcp251x_priv *priv = netdev_priv(net); | |
516 | struct spi_device *spi = priv->spi; | |
517 | ||
518 | if (priv->tx_skb || priv->tx_len) { | |
519 | dev_warn(&spi->dev, "hard_xmit called while tx busy\n"); | |
e0000163 CP |
520 | return NETDEV_TX_BUSY; |
521 | } | |
522 | ||
3ccd4c61 | 523 | if (can_dropped_invalid_skb(net, skb)) |
e0000163 | 524 | return NETDEV_TX_OK; |
e0000163 CP |
525 | |
526 | netif_stop_queue(net); | |
527 | priv->tx_skb = skb; | |
e0000163 CP |
528 | queue_work(priv->wq, &priv->tx_work); |
529 | ||
530 | return NETDEV_TX_OK; | |
531 | } | |
532 | ||
533 | static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode) | |
534 | { | |
535 | struct mcp251x_priv *priv = netdev_priv(net); | |
536 | ||
537 | switch (mode) { | |
538 | case CAN_MODE_START: | |
bf66f373 | 539 | mcp251x_clean(net); |
e0000163 CP |
540 | /* We have to delay work since SPI I/O may sleep */ |
541 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
542 | priv->restart_tx = 1; | |
543 | if (priv->can.restart_ms == 0) | |
544 | priv->after_suspend = AFTER_SUSPEND_RESTART; | |
bf66f373 | 545 | queue_work(priv->wq, &priv->restart_work); |
e0000163 CP |
546 | break; |
547 | default: | |
548 | return -EOPNOTSUPP; | |
549 | } | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
bf66f373 | 554 | static int mcp251x_set_normal_mode(struct spi_device *spi) |
e0000163 | 555 | { |
fce5c293 | 556 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
557 | unsigned long timeout; |
558 | ||
559 | /* Enable interrupts */ | |
560 | mcp251x_write_reg(spi, CANINTE, | |
561 | CANINTE_ERRIE | CANINTE_TX2IE | CANINTE_TX1IE | | |
bf66f373 | 562 | CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE); |
e0000163 CP |
563 | |
564 | if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) { | |
565 | /* Put device into loopback mode */ | |
566 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LOOPBACK); | |
ad72c347 CP |
567 | } else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) { |
568 | /* Put device into listen-only mode */ | |
569 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY); | |
e0000163 CP |
570 | } else { |
571 | /* Put device into normal mode */ | |
bf66f373 | 572 | mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL); |
e0000163 CP |
573 | |
574 | /* Wait for the device to enter normal mode */ | |
575 | timeout = jiffies + HZ; | |
576 | while (mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) { | |
577 | schedule(); | |
578 | if (time_after(jiffies, timeout)) { | |
579 | dev_err(&spi->dev, "MCP251x didn't" | |
580 | " enter in normal mode\n"); | |
bf66f373 | 581 | return -EBUSY; |
e0000163 CP |
582 | } |
583 | } | |
584 | } | |
585 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
bf66f373 | 586 | return 0; |
e0000163 CP |
587 | } |
588 | ||
589 | static int mcp251x_do_set_bittiming(struct net_device *net) | |
590 | { | |
591 | struct mcp251x_priv *priv = netdev_priv(net); | |
592 | struct can_bittiming *bt = &priv->can.bittiming; | |
593 | struct spi_device *spi = priv->spi; | |
594 | ||
595 | mcp251x_write_reg(spi, CNF1, ((bt->sjw - 1) << CNF1_SJW_SHIFT) | | |
596 | (bt->brp - 1)); | |
597 | mcp251x_write_reg(spi, CNF2, CNF2_BTLMODE | | |
598 | (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES ? | |
599 | CNF2_SAM : 0) | | |
600 | ((bt->phase_seg1 - 1) << CNF2_PS1_SHIFT) | | |
601 | (bt->prop_seg - 1)); | |
602 | mcp251x_write_bits(spi, CNF3, CNF3_PHSEG2_MASK, | |
603 | (bt->phase_seg2 - 1)); | |
1e6cacdb AS |
604 | dev_dbg(&spi->dev, "CNF: 0x%02x 0x%02x 0x%02x\n", |
605 | mcp251x_read_reg(spi, CNF1), | |
606 | mcp251x_read_reg(spi, CNF2), | |
607 | mcp251x_read_reg(spi, CNF3)); | |
e0000163 CP |
608 | |
609 | return 0; | |
610 | } | |
611 | ||
612 | static int mcp251x_setup(struct net_device *net, struct mcp251x_priv *priv, | |
613 | struct spi_device *spi) | |
614 | { | |
615534bc | 615 | mcp251x_do_set_bittiming(net); |
e0000163 | 616 | |
bf66f373 CP |
617 | mcp251x_write_reg(spi, RXBCTRL(0), |
618 | RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1); | |
619 | mcp251x_write_reg(spi, RXBCTRL(1), | |
620 | RXBCTRL_RXM0 | RXBCTRL_RXM1); | |
e0000163 CP |
621 | return 0; |
622 | } | |
623 | ||
bf66f373 | 624 | static int mcp251x_hw_reset(struct spi_device *spi) |
e0000163 | 625 | { |
fce5c293 | 626 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 | 627 | int ret; |
bf66f373 | 628 | unsigned long timeout; |
e0000163 CP |
629 | |
630 | priv->spi_tx_buf[0] = INSTRUCTION_RESET; | |
e0000163 | 631 | ret = spi_write(spi, priv->spi_tx_buf, 1); |
bf66f373 | 632 | if (ret) { |
e0000163 | 633 | dev_err(&spi->dev, "reset failed: ret = %d\n", ret); |
bf66f373 CP |
634 | return -EIO; |
635 | } | |
636 | ||
e0000163 | 637 | /* Wait for reset to finish */ |
bf66f373 | 638 | timeout = jiffies + HZ; |
e0000163 | 639 | mdelay(10); |
bf66f373 CP |
640 | while ((mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) |
641 | != CANCTRL_REQOP_CONF) { | |
642 | schedule(); | |
643 | if (time_after(jiffies, timeout)) { | |
644 | dev_err(&spi->dev, "MCP251x didn't" | |
645 | " enter in conf mode after reset\n"); | |
646 | return -EBUSY; | |
647 | } | |
648 | } | |
649 | return 0; | |
e0000163 CP |
650 | } |
651 | ||
652 | static int mcp251x_hw_probe(struct spi_device *spi) | |
653 | { | |
654 | int st1, st2; | |
655 | ||
656 | mcp251x_hw_reset(spi); | |
657 | ||
658 | /* | |
659 | * Please note that these are "magic values" based on after | |
660 | * reset defaults taken from data sheet which allows us to see | |
661 | * if we really have a chip on the bus (we avoid common all | |
662 | * zeroes or all ones situations) | |
663 | */ | |
664 | st1 = mcp251x_read_reg(spi, CANSTAT) & 0xEE; | |
665 | st2 = mcp251x_read_reg(spi, CANCTRL) & 0x17; | |
666 | ||
667 | dev_dbg(&spi->dev, "CANSTAT 0x%02x CANCTRL 0x%02x\n", st1, st2); | |
668 | ||
669 | /* Check for power up default values */ | |
670 | return (st1 == 0x80 && st2 == 0x07) ? 1 : 0; | |
671 | } | |
672 | ||
1ddff7da AS |
673 | static int mcp251x_power_enable(struct regulator *reg, int enable) |
674 | { | |
675 | if (IS_ERR(reg)) | |
676 | return 0; | |
677 | ||
678 | if (enable) | |
679 | return regulator_enable(reg); | |
680 | else | |
681 | return regulator_disable(reg); | |
682 | } | |
683 | ||
bf66f373 | 684 | static void mcp251x_open_clean(struct net_device *net) |
e0000163 CP |
685 | { |
686 | struct mcp251x_priv *priv = netdev_priv(net); | |
687 | struct spi_device *spi = priv->spi; | |
615534bc | 688 | |
bf66f373 CP |
689 | free_irq(spi->irq, priv); |
690 | mcp251x_hw_sleep(spi); | |
1ddff7da | 691 | mcp251x_power_enable(priv->transceiver, 0); |
bf66f373 | 692 | close_candev(net); |
e0000163 CP |
693 | } |
694 | ||
695 | static int mcp251x_stop(struct net_device *net) | |
696 | { | |
697 | struct mcp251x_priv *priv = netdev_priv(net); | |
698 | struct spi_device *spi = priv->spi; | |
e0000163 CP |
699 | |
700 | close_candev(net); | |
701 | ||
bf66f373 CP |
702 | priv->force_quit = 1; |
703 | free_irq(spi->irq, priv); | |
704 | destroy_workqueue(priv->wq); | |
705 | priv->wq = NULL; | |
706 | ||
707 | mutex_lock(&priv->mcp_lock); | |
708 | ||
e0000163 CP |
709 | /* Disable and clear pending interrupts */ |
710 | mcp251x_write_reg(spi, CANINTE, 0x00); | |
711 | mcp251x_write_reg(spi, CANINTF, 0x00); | |
712 | ||
e0000163 | 713 | mcp251x_write_reg(spi, TXBCTRL(0), 0); |
bf66f373 | 714 | mcp251x_clean(net); |
e0000163 CP |
715 | |
716 | mcp251x_hw_sleep(spi); | |
717 | ||
1ddff7da | 718 | mcp251x_power_enable(priv->transceiver, 0); |
e0000163 CP |
719 | |
720 | priv->can.state = CAN_STATE_STOPPED; | |
721 | ||
bf66f373 CP |
722 | mutex_unlock(&priv->mcp_lock); |
723 | ||
eb072a9b FB |
724 | can_led_event(net, CAN_LED_EVENT_STOP); |
725 | ||
e0000163 CP |
726 | return 0; |
727 | } | |
728 | ||
bf66f373 CP |
729 | static void mcp251x_error_skb(struct net_device *net, int can_id, int data1) |
730 | { | |
731 | struct sk_buff *skb; | |
732 | struct can_frame *frame; | |
733 | ||
734 | skb = alloc_can_err_skb(net, &frame); | |
735 | if (skb) { | |
612eef4f | 736 | frame->can_id |= can_id; |
bf66f373 | 737 | frame->data[1] = data1; |
57d3c7b0 | 738 | netif_rx_ni(skb); |
bf66f373 | 739 | } else { |
aabdfd6a | 740 | netdev_err(net, "cannot allocate error skb\n"); |
bf66f373 CP |
741 | } |
742 | } | |
743 | ||
e0000163 CP |
744 | static void mcp251x_tx_work_handler(struct work_struct *ws) |
745 | { | |
746 | struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv, | |
747 | tx_work); | |
748 | struct spi_device *spi = priv->spi; | |
749 | struct net_device *net = priv->net; | |
750 | struct can_frame *frame; | |
751 | ||
bf66f373 | 752 | mutex_lock(&priv->mcp_lock); |
e0000163 | 753 | if (priv->tx_skb) { |
e0000163 CP |
754 | if (priv->can.state == CAN_STATE_BUS_OFF) { |
755 | mcp251x_clean(net); | |
bf66f373 CP |
756 | } else { |
757 | frame = (struct can_frame *)priv->tx_skb->data; | |
758 | ||
759 | if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN) | |
760 | frame->can_dlc = CAN_FRAME_MAX_DATA_LEN; | |
761 | mcp251x_hw_tx(spi, frame, 0); | |
762 | priv->tx_len = 1 + frame->can_dlc; | |
763 | can_put_echo_skb(priv->tx_skb, net, 0); | |
764 | priv->tx_skb = NULL; | |
e0000163 | 765 | } |
e0000163 | 766 | } |
bf66f373 | 767 | mutex_unlock(&priv->mcp_lock); |
e0000163 CP |
768 | } |
769 | ||
bf66f373 | 770 | static void mcp251x_restart_work_handler(struct work_struct *ws) |
e0000163 CP |
771 | { |
772 | struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv, | |
bf66f373 | 773 | restart_work); |
e0000163 CP |
774 | struct spi_device *spi = priv->spi; |
775 | struct net_device *net = priv->net; | |
e0000163 | 776 | |
bf66f373 | 777 | mutex_lock(&priv->mcp_lock); |
e0000163 CP |
778 | if (priv->after_suspend) { |
779 | mdelay(10); | |
780 | mcp251x_hw_reset(spi); | |
781 | mcp251x_setup(net, priv, spi); | |
782 | if (priv->after_suspend & AFTER_SUSPEND_RESTART) { | |
783 | mcp251x_set_normal_mode(spi); | |
784 | } else if (priv->after_suspend & AFTER_SUSPEND_UP) { | |
785 | netif_device_attach(net); | |
bf66f373 | 786 | mcp251x_clean(net); |
e0000163 | 787 | mcp251x_set_normal_mode(spi); |
bf66f373 | 788 | netif_wake_queue(net); |
e0000163 CP |
789 | } else { |
790 | mcp251x_hw_sleep(spi); | |
791 | } | |
792 | priv->after_suspend = 0; | |
bf66f373 | 793 | priv->force_quit = 0; |
e0000163 CP |
794 | } |
795 | ||
bf66f373 CP |
796 | if (priv->restart_tx) { |
797 | priv->restart_tx = 0; | |
798 | mcp251x_write_reg(spi, TXBCTRL(0), 0); | |
799 | mcp251x_clean(net); | |
800 | netif_wake_queue(net); | |
801 | mcp251x_error_skb(net, CAN_ERR_RESTARTED, 0); | |
802 | } | |
803 | mutex_unlock(&priv->mcp_lock); | |
804 | } | |
e0000163 | 805 | |
bf66f373 CP |
806 | static irqreturn_t mcp251x_can_ist(int irq, void *dev_id) |
807 | { | |
808 | struct mcp251x_priv *priv = dev_id; | |
809 | struct spi_device *spi = priv->spi; | |
810 | struct net_device *net = priv->net; | |
e0000163 | 811 | |
bf66f373 CP |
812 | mutex_lock(&priv->mcp_lock); |
813 | while (!priv->force_quit) { | |
814 | enum can_state new_state; | |
f3a3ed31 | 815 | u8 intf, eflag; |
d3cd1565 | 816 | u8 clear_intf = 0; |
bf66f373 | 817 | int can_id = 0, data1 = 0; |
e0000163 | 818 | |
f3a3ed31 SH |
819 | mcp251x_read_2regs(spi, CANINTF, &intf, &eflag); |
820 | ||
5601b2df MKB |
821 | /* mask out flags we don't care about */ |
822 | intf &= CANINTF_RX | CANINTF_TX | CANINTF_ERR; | |
823 | ||
d3cd1565 | 824 | /* receive buffer 0 */ |
bf66f373 CP |
825 | if (intf & CANINTF_RX0IF) { |
826 | mcp251x_hw_rx(spi, 0); | |
9c473fc3 MKB |
827 | /* |
828 | * Free one buffer ASAP | |
829 | * (The MCP2515 does this automatically.) | |
830 | */ | |
831 | if (mcp251x_is_2510(spi)) | |
832 | mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00); | |
e0000163 CP |
833 | } |
834 | ||
d3cd1565 MKB |
835 | /* receive buffer 1 */ |
836 | if (intf & CANINTF_RX1IF) { | |
bf66f373 | 837 | mcp251x_hw_rx(spi, 1); |
9c473fc3 MKB |
838 | /* the MCP2515 does this automatically */ |
839 | if (mcp251x_is_2510(spi)) | |
840 | clear_intf |= CANINTF_RX1IF; | |
d3cd1565 | 841 | } |
e0000163 | 842 | |
d3cd1565 | 843 | /* any error or tx interrupt we need to clear? */ |
5601b2df MKB |
844 | if (intf & (CANINTF_ERR | CANINTF_TX)) |
845 | clear_intf |= intf & (CANINTF_ERR | CANINTF_TX); | |
d3cd1565 MKB |
846 | if (clear_intf) |
847 | mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00); | |
e0000163 | 848 | |
7e15de3a SH |
849 | if (eflag) |
850 | mcp251x_write_bits(spi, EFLG, eflag, 0x00); | |
bf66f373 | 851 | |
e0000163 CP |
852 | /* Update can state */ |
853 | if (eflag & EFLG_TXBO) { | |
854 | new_state = CAN_STATE_BUS_OFF; | |
855 | can_id |= CAN_ERR_BUSOFF; | |
856 | } else if (eflag & EFLG_TXEP) { | |
857 | new_state = CAN_STATE_ERROR_PASSIVE; | |
858 | can_id |= CAN_ERR_CRTL; | |
859 | data1 |= CAN_ERR_CRTL_TX_PASSIVE; | |
860 | } else if (eflag & EFLG_RXEP) { | |
861 | new_state = CAN_STATE_ERROR_PASSIVE; | |
862 | can_id |= CAN_ERR_CRTL; | |
863 | data1 |= CAN_ERR_CRTL_RX_PASSIVE; | |
864 | } else if (eflag & EFLG_TXWAR) { | |
865 | new_state = CAN_STATE_ERROR_WARNING; | |
866 | can_id |= CAN_ERR_CRTL; | |
867 | data1 |= CAN_ERR_CRTL_TX_WARNING; | |
868 | } else if (eflag & EFLG_RXWAR) { | |
869 | new_state = CAN_STATE_ERROR_WARNING; | |
870 | can_id |= CAN_ERR_CRTL; | |
871 | data1 |= CAN_ERR_CRTL_RX_WARNING; | |
872 | } else { | |
873 | new_state = CAN_STATE_ERROR_ACTIVE; | |
874 | } | |
875 | ||
876 | /* Update can state statistics */ | |
877 | switch (priv->can.state) { | |
878 | case CAN_STATE_ERROR_ACTIVE: | |
879 | if (new_state >= CAN_STATE_ERROR_WARNING && | |
880 | new_state <= CAN_STATE_BUS_OFF) | |
881 | priv->can.can_stats.error_warning++; | |
882 | case CAN_STATE_ERROR_WARNING: /* fallthrough */ | |
883 | if (new_state >= CAN_STATE_ERROR_PASSIVE && | |
884 | new_state <= CAN_STATE_BUS_OFF) | |
885 | priv->can.can_stats.error_passive++; | |
886 | break; | |
887 | default: | |
888 | break; | |
889 | } | |
890 | priv->can.state = new_state; | |
891 | ||
bf66f373 CP |
892 | if (intf & CANINTF_ERRIF) { |
893 | /* Handle overflow counters */ | |
894 | if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) { | |
711e4d6e | 895 | if (eflag & EFLG_RX0OVR) { |
bf66f373 | 896 | net->stats.rx_over_errors++; |
711e4d6e SH |
897 | net->stats.rx_errors++; |
898 | } | |
899 | if (eflag & EFLG_RX1OVR) { | |
bf66f373 | 900 | net->stats.rx_over_errors++; |
711e4d6e SH |
901 | net->stats.rx_errors++; |
902 | } | |
bf66f373 CP |
903 | can_id |= CAN_ERR_CRTL; |
904 | data1 |= CAN_ERR_CRTL_RX_OVERFLOW; | |
e0000163 | 905 | } |
bf66f373 | 906 | mcp251x_error_skb(net, can_id, data1); |
e0000163 CP |
907 | } |
908 | ||
909 | if (priv->can.state == CAN_STATE_BUS_OFF) { | |
910 | if (priv->can.restart_ms == 0) { | |
bf66f373 | 911 | priv->force_quit = 1; |
e0000163 CP |
912 | can_bus_off(net); |
913 | mcp251x_hw_sleep(spi); | |
bf66f373 | 914 | break; |
e0000163 CP |
915 | } |
916 | } | |
917 | ||
918 | if (intf == 0) | |
919 | break; | |
920 | ||
5601b2df | 921 | if (intf & CANINTF_TX) { |
e0000163 CP |
922 | net->stats.tx_packets++; |
923 | net->stats.tx_bytes += priv->tx_len - 1; | |
eb072a9b | 924 | can_led_event(net, CAN_LED_EVENT_TX); |
e0000163 CP |
925 | if (priv->tx_len) { |
926 | can_get_echo_skb(net, 0); | |
927 | priv->tx_len = 0; | |
928 | } | |
929 | netif_wake_queue(net); | |
930 | } | |
931 | ||
bf66f373 CP |
932 | } |
933 | mutex_unlock(&priv->mcp_lock); | |
934 | return IRQ_HANDLED; | |
935 | } | |
e0000163 | 936 | |
bf66f373 CP |
937 | static int mcp251x_open(struct net_device *net) |
938 | { | |
939 | struct mcp251x_priv *priv = netdev_priv(net); | |
940 | struct spi_device *spi = priv->spi; | |
ae5d589e | 941 | unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_FALLING; |
bf66f373 CP |
942 | int ret; |
943 | ||
944 | ret = open_candev(net); | |
945 | if (ret) { | |
946 | dev_err(&spi->dev, "unable to set initial baudrate!\n"); | |
947 | return ret; | |
948 | } | |
949 | ||
950 | mutex_lock(&priv->mcp_lock); | |
1ddff7da | 951 | mcp251x_power_enable(priv->transceiver, 1); |
bf66f373 CP |
952 | |
953 | priv->force_quit = 0; | |
954 | priv->tx_skb = NULL; | |
955 | priv->tx_len = 0; | |
956 | ||
957 | ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist, | |
db388d64 | 958 | flags, DEVICE_NAME, priv); |
bf66f373 CP |
959 | if (ret) { |
960 | dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq); | |
1ddff7da | 961 | mcp251x_power_enable(priv->transceiver, 0); |
bf66f373 CP |
962 | close_candev(net); |
963 | goto open_unlock; | |
964 | } | |
965 | ||
58a69cb4 | 966 | priv->wq = create_freezable_workqueue("mcp251x_wq"); |
bf66f373 CP |
967 | INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler); |
968 | INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler); | |
969 | ||
970 | ret = mcp251x_hw_reset(spi); | |
971 | if (ret) { | |
972 | mcp251x_open_clean(net); | |
973 | goto open_unlock; | |
974 | } | |
975 | ret = mcp251x_setup(net, priv, spi); | |
976 | if (ret) { | |
977 | mcp251x_open_clean(net); | |
978 | goto open_unlock; | |
e0000163 | 979 | } |
bf66f373 CP |
980 | ret = mcp251x_set_normal_mode(spi); |
981 | if (ret) { | |
982 | mcp251x_open_clean(net); | |
983 | goto open_unlock; | |
984 | } | |
eb072a9b FB |
985 | |
986 | can_led_event(net, CAN_LED_EVENT_OPEN); | |
987 | ||
bf66f373 CP |
988 | netif_wake_queue(net); |
989 | ||
990 | open_unlock: | |
991 | mutex_unlock(&priv->mcp_lock); | |
992 | return ret; | |
e0000163 CP |
993 | } |
994 | ||
995 | static const struct net_device_ops mcp251x_netdev_ops = { | |
996 | .ndo_open = mcp251x_open, | |
997 | .ndo_stop = mcp251x_stop, | |
998 | .ndo_start_xmit = mcp251x_hard_start_xmit, | |
c971fa2a | 999 | .ndo_change_mtu = can_change_mtu, |
e0000163 CP |
1000 | }; |
1001 | ||
66606aaf AS |
1002 | static const struct of_device_id mcp251x_of_match[] = { |
1003 | { | |
1004 | .compatible = "microchip,mcp2510", | |
1005 | .data = (void *)CAN_MCP251X_MCP2510, | |
1006 | }, | |
1007 | { | |
1008 | .compatible = "microchip,mcp2515", | |
1009 | .data = (void *)CAN_MCP251X_MCP2515, | |
1010 | }, | |
1011 | { } | |
1012 | }; | |
1013 | MODULE_DEVICE_TABLE(of, mcp251x_of_match); | |
1014 | ||
1015 | static const struct spi_device_id mcp251x_id_table[] = { | |
1016 | { | |
1017 | .name = "mcp2510", | |
1018 | .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2510, | |
1019 | }, | |
1020 | { | |
1021 | .name = "mcp2515", | |
1022 | .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2515, | |
1023 | }, | |
1024 | { } | |
1025 | }; | |
1026 | MODULE_DEVICE_TABLE(spi, mcp251x_id_table); | |
1027 | ||
3c8ac0f2 | 1028 | static int mcp251x_can_probe(struct spi_device *spi) |
e0000163 | 1029 | { |
66606aaf AS |
1030 | const struct of_device_id *of_id = of_match_device(mcp251x_of_match, |
1031 | &spi->dev); | |
1032 | struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev); | |
e0000163 CP |
1033 | struct net_device *net; |
1034 | struct mcp251x_priv *priv; | |
66606aaf AS |
1035 | int freq, ret = -ENODEV; |
1036 | struct clk *clk; | |
1037 | ||
1038 | clk = devm_clk_get(&spi->dev, NULL); | |
1039 | if (IS_ERR(clk)) { | |
1040 | if (pdata) | |
1041 | freq = pdata->oscillator_frequency; | |
1042 | else | |
1043 | return PTR_ERR(clk); | |
1044 | } else { | |
1045 | freq = clk_get_rate(clk); | |
1046 | } | |
e0000163 | 1047 | |
66606aaf AS |
1048 | /* Sanity check */ |
1049 | if (freq < 1000000 || freq > 25000000) | |
1050 | return -ERANGE; | |
e0000163 CP |
1051 | |
1052 | /* Allocate can/net device */ | |
1053 | net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX); | |
66606aaf AS |
1054 | if (!net) |
1055 | return -ENOMEM; | |
1056 | ||
1057 | if (!IS_ERR(clk)) { | |
1058 | ret = clk_prepare_enable(clk); | |
1059 | if (ret) | |
1060 | goto out_free; | |
e0000163 CP |
1061 | } |
1062 | ||
1063 | net->netdev_ops = &mcp251x_netdev_ops; | |
1064 | net->flags |= IFF_ECHO; | |
1065 | ||
1066 | priv = netdev_priv(net); | |
1067 | priv->can.bittiming_const = &mcp251x_bittiming_const; | |
1068 | priv->can.do_set_mode = mcp251x_do_set_mode; | |
66606aaf | 1069 | priv->can.clock.freq = freq / 2; |
ad72c347 CP |
1070 | priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | |
1071 | CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY; | |
66606aaf AS |
1072 | if (of_id) |
1073 | priv->model = (enum mcp251x_model)of_id->data; | |
1074 | else | |
1075 | priv->model = spi_get_device_id(spi)->driver_data; | |
e0000163 | 1076 | priv->net = net; |
66606aaf | 1077 | priv->clk = clk; |
1ddff7da AS |
1078 | |
1079 | priv->power = devm_regulator_get(&spi->dev, "vdd"); | |
1080 | priv->transceiver = devm_regulator_get(&spi->dev, "xceiver"); | |
1081 | if ((PTR_ERR(priv->power) == -EPROBE_DEFER) || | |
1082 | (PTR_ERR(priv->transceiver) == -EPROBE_DEFER)) { | |
1083 | ret = -EPROBE_DEFER; | |
66606aaf | 1084 | goto out_clk; |
1ddff7da AS |
1085 | } |
1086 | ||
1087 | ret = mcp251x_power_enable(priv->power, 1); | |
1088 | if (ret) | |
66606aaf | 1089 | goto out_clk; |
1ddff7da | 1090 | |
fce5c293 | 1091 | spi_set_drvdata(spi, priv); |
e0000163 CP |
1092 | |
1093 | priv->spi = spi; | |
bf66f373 | 1094 | mutex_init(&priv->mcp_lock); |
e0000163 CP |
1095 | |
1096 | /* If requested, allocate DMA buffers */ | |
1097 | if (mcp251x_enable_dma) { | |
1098 | spi->dev.coherent_dma_mask = ~0; | |
1099 | ||
1100 | /* | |
1101 | * Minimum coherent DMA allocation is PAGE_SIZE, so allocate | |
1102 | * that much and share it between Tx and Rx DMA buffers. | |
1103 | */ | |
1104 | priv->spi_tx_buf = dma_alloc_coherent(&spi->dev, | |
1105 | PAGE_SIZE, | |
1106 | &priv->spi_tx_dma, | |
1107 | GFP_DMA); | |
1108 | ||
1109 | if (priv->spi_tx_buf) { | |
c2fd03a0 | 1110 | priv->spi_rx_buf = (priv->spi_tx_buf + (PAGE_SIZE / 2)); |
e0000163 CP |
1111 | priv->spi_rx_dma = (dma_addr_t)(priv->spi_tx_dma + |
1112 | (PAGE_SIZE / 2)); | |
1113 | } else { | |
1114 | /* Fall back to non-DMA */ | |
1115 | mcp251x_enable_dma = 0; | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | /* Allocate non-DMA buffers */ | |
1120 | if (!mcp251x_enable_dma) { | |
21629e1a AS |
1121 | priv->spi_tx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN, |
1122 | GFP_KERNEL); | |
e0000163 CP |
1123 | if (!priv->spi_tx_buf) { |
1124 | ret = -ENOMEM; | |
21629e1a | 1125 | goto error_probe; |
e0000163 | 1126 | } |
21629e1a AS |
1127 | priv->spi_rx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN, |
1128 | GFP_KERNEL); | |
ce739b47 | 1129 | if (!priv->spi_rx_buf) { |
e0000163 | 1130 | ret = -ENOMEM; |
21629e1a | 1131 | goto error_probe; |
e0000163 CP |
1132 | } |
1133 | } | |
1134 | ||
e0000163 CP |
1135 | SET_NETDEV_DEV(net, &spi->dev); |
1136 | ||
e0000163 | 1137 | /* Configure the SPI bus */ |
b1ef05a5 AS |
1138 | spi->mode = spi->mode ? : SPI_MODE_0; |
1139 | if (mcp251x_is_2510(spi)) | |
1140 | spi->max_speed_hz = spi->max_speed_hz ? : 5 * 1000 * 1000; | |
1141 | else | |
1142 | spi->max_speed_hz = spi->max_speed_hz ? : 10 * 1000 * 1000; | |
e0000163 CP |
1143 | spi->bits_per_word = 8; |
1144 | spi_setup(spi); | |
1145 | ||
bf66f373 | 1146 | /* Here is OK to not lock the MCP, no one knows about it yet */ |
e0000163 | 1147 | if (!mcp251x_hw_probe(spi)) { |
1ddff7da | 1148 | ret = -ENODEV; |
e0000163 CP |
1149 | goto error_probe; |
1150 | } | |
1151 | mcp251x_hw_sleep(spi); | |
1152 | ||
e0000163 | 1153 | ret = register_candev(net); |
eb072a9b FB |
1154 | if (ret) |
1155 | goto error_probe; | |
1156 | ||
1157 | devm_can_led_init(net); | |
1158 | ||
eb072a9b FB |
1159 | return ret; |
1160 | ||
e0000163 | 1161 | error_probe: |
e0000163 CP |
1162 | if (mcp251x_enable_dma) |
1163 | dma_free_coherent(&spi->dev, PAGE_SIZE, | |
1164 | priv->spi_tx_buf, priv->spi_tx_dma); | |
1ddff7da | 1165 | mcp251x_power_enable(priv->power, 0); |
66606aaf AS |
1166 | |
1167 | out_clk: | |
1168 | if (!IS_ERR(clk)) | |
1169 | clk_disable_unprepare(clk); | |
1170 | ||
1171 | out_free: | |
1ddff7da | 1172 | free_candev(net); |
66606aaf | 1173 | |
e0000163 CP |
1174 | return ret; |
1175 | } | |
1176 | ||
3c8ac0f2 | 1177 | static int mcp251x_can_remove(struct spi_device *spi) |
e0000163 | 1178 | { |
fce5c293 | 1179 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
1180 | struct net_device *net = priv->net; |
1181 | ||
1182 | unregister_candev(net); | |
e0000163 | 1183 | |
e0000163 CP |
1184 | if (mcp251x_enable_dma) { |
1185 | dma_free_coherent(&spi->dev, PAGE_SIZE, | |
1186 | priv->spi_tx_buf, priv->spi_tx_dma); | |
e0000163 CP |
1187 | } |
1188 | ||
1ddff7da AS |
1189 | mcp251x_power_enable(priv->power, 0); |
1190 | ||
66606aaf AS |
1191 | if (!IS_ERR(priv->clk)) |
1192 | clk_disable_unprepare(priv->clk); | |
1193 | ||
1ddff7da | 1194 | free_candev(net); |
e0000163 CP |
1195 | |
1196 | return 0; | |
1197 | } | |
1198 | ||
f16a4210 | 1199 | static int __maybe_unused mcp251x_can_suspend(struct device *dev) |
e0000163 | 1200 | { |
612b2a97 | 1201 | struct spi_device *spi = to_spi_device(dev); |
fce5c293 | 1202 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
1203 | struct net_device *net = priv->net; |
1204 | ||
bf66f373 CP |
1205 | priv->force_quit = 1; |
1206 | disable_irq(spi->irq); | |
1207 | /* | |
1208 | * Note: at this point neither IST nor workqueues are running. | |
1209 | * open/stop cannot be called anyway so locking is not needed | |
1210 | */ | |
e0000163 CP |
1211 | if (netif_running(net)) { |
1212 | netif_device_detach(net); | |
1213 | ||
1214 | mcp251x_hw_sleep(spi); | |
1ddff7da | 1215 | mcp251x_power_enable(priv->transceiver, 0); |
e0000163 CP |
1216 | priv->after_suspend = AFTER_SUSPEND_UP; |
1217 | } else { | |
1218 | priv->after_suspend = AFTER_SUSPEND_DOWN; | |
1219 | } | |
1220 | ||
1ddff7da AS |
1221 | if (!IS_ERR(priv->power)) { |
1222 | regulator_disable(priv->power); | |
e0000163 CP |
1223 | priv->after_suspend |= AFTER_SUSPEND_POWER; |
1224 | } | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
f16a4210 | 1229 | static int __maybe_unused mcp251x_can_resume(struct device *dev) |
e0000163 | 1230 | { |
612b2a97 | 1231 | struct spi_device *spi = to_spi_device(dev); |
fce5c293 | 1232 | struct mcp251x_priv *priv = spi_get_drvdata(spi); |
e0000163 CP |
1233 | |
1234 | if (priv->after_suspend & AFTER_SUSPEND_POWER) { | |
1ddff7da | 1235 | mcp251x_power_enable(priv->power, 1); |
bf66f373 | 1236 | queue_work(priv->wq, &priv->restart_work); |
e0000163 CP |
1237 | } else { |
1238 | if (priv->after_suspend & AFTER_SUSPEND_UP) { | |
1ddff7da | 1239 | mcp251x_power_enable(priv->transceiver, 1); |
bf66f373 | 1240 | queue_work(priv->wq, &priv->restart_work); |
e0000163 CP |
1241 | } else { |
1242 | priv->after_suspend = 0; | |
1243 | } | |
1244 | } | |
bf66f373 CP |
1245 | priv->force_quit = 0; |
1246 | enable_irq(spi->irq); | |
e0000163 CP |
1247 | return 0; |
1248 | } | |
612b2a97 LPC |
1249 | |
1250 | static SIMPLE_DEV_PM_OPS(mcp251x_can_pm_ops, mcp251x_can_suspend, | |
1251 | mcp251x_can_resume); | |
e0000163 CP |
1252 | |
1253 | static struct spi_driver mcp251x_can_driver = { | |
1254 | .driver = { | |
1255 | .name = DEVICE_NAME, | |
e0000163 | 1256 | .owner = THIS_MODULE, |
66606aaf | 1257 | .of_match_table = mcp251x_of_match, |
4fcc999e | 1258 | .pm = &mcp251x_can_pm_ops, |
e0000163 | 1259 | }, |
e446630c | 1260 | .id_table = mcp251x_id_table, |
e0000163 | 1261 | .probe = mcp251x_can_probe, |
3c8ac0f2 | 1262 | .remove = mcp251x_can_remove, |
e0000163 | 1263 | }; |
01b88070 | 1264 | module_spi_driver(mcp251x_can_driver); |
e0000163 CP |
1265 | |
1266 | MODULE_AUTHOR("Chris Elston <celston@katalix.com>, " | |
1267 | "Christian Pellegrin <chripell@evolware.org>"); | |
1268 | MODULE_DESCRIPTION("Microchip 251x CAN driver"); | |
1269 | MODULE_LICENSE("GPL v2"); |