1 // SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
2 /* Copyright (C) 2018 KVASER AB, Sweden. All rights reserved.
3 * Parts of this driver are based on the following:
4 * - Kvaser linux pciefd driver (version 5.42)
5 * - PEAK linux canfd driver
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/can/dev.h>
10 #include <linux/device.h>
11 #include <linux/ethtool.h>
12 #include <linux/iopoll.h>
13 #include <linux/kernel.h>
14 #include <linux/minmax.h>
15 #include <linux/module.h>
16 #include <linux/netdevice.h>
17 #include <linux/pci.h>
18 #include <linux/timer.h>
19
20 MODULE_LICENSE("Dual BSD/GPL");
21 MODULE_AUTHOR("Kvaser AB <support@kvaser.com>");
22 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/PCIe devices");
23
24 #define KVASER_PCIEFD_DRV_NAME "kvaser_pciefd"
25
26 #define KVASER_PCIEFD_WAIT_TIMEOUT msecs_to_jiffies(1000)
27 #define KVASER_PCIEFD_BEC_POLL_FREQ (jiffies + msecs_to_jiffies(200))
28 #define KVASER_PCIEFD_MAX_ERR_REP 256U
29 #define KVASER_PCIEFD_CAN_TX_MAX_COUNT 17U
30 #define KVASER_PCIEFD_MAX_CAN_CHANNELS 8UL
31 #define KVASER_PCIEFD_DMA_COUNT 2U
32
33 #define KVASER_PCIEFD_DMA_SIZE (4U * 1024U)
34
35 #define KVASER_PCIEFD_VENDOR 0x1a07
36 /* Altera based devices */
37 #define KVASER_PCIEFD_4HS_DEVICE_ID 0x000d
38 #define KVASER_PCIEFD_2HS_V2_DEVICE_ID 0x000e
39 #define KVASER_PCIEFD_HS_V2_DEVICE_ID 0x000f
40 #define KVASER_PCIEFD_MINIPCIE_HS_V2_DEVICE_ID 0x0010
41 #define KVASER_PCIEFD_MINIPCIE_2HS_V2_DEVICE_ID 0x0011
42
43 /* SmartFusion2 based devices */
44 #define KVASER_PCIEFD_2CAN_V3_DEVICE_ID 0x0012
45 #define KVASER_PCIEFD_1CAN_V3_DEVICE_ID 0x0013
46 #define KVASER_PCIEFD_4CAN_V2_DEVICE_ID 0x0014
47 #define KVASER_PCIEFD_MINIPCIE_2CAN_V3_DEVICE_ID 0x0015
48 #define KVASER_PCIEFD_MINIPCIE_1CAN_V3_DEVICE_ID 0x0016
49
50 /* Xilinx based devices */
51 #define KVASER_PCIEFD_M2_4CAN_DEVICE_ID 0x0017
52 #define KVASER_PCIEFD_8CAN_DEVICE_ID 0x0019
53
54 /* Altera SerDes Enable 64-bit DMA address translation */
55 #define KVASER_PCIEFD_ALTERA_DMA_64BIT BIT(0)
56
57 /* SmartFusion2 SerDes LSB address translation mask */
58 #define KVASER_PCIEFD_SF2_DMA_LSB_MASK GENMASK(31, 12)
59
60 /* Xilinx SerDes LSB address translation mask */
61 #define KVASER_PCIEFD_XILINX_DMA_LSB_MASK GENMASK(31, 12)
62
63 /* Kvaser KCAN CAN controller registers */
64 #define KVASER_PCIEFD_KCAN_FIFO_REG 0x100
65 #define KVASER_PCIEFD_KCAN_FIFO_LAST_REG 0x180
66 #define KVASER_PCIEFD_KCAN_CTRL_REG 0x2c0
67 #define KVASER_PCIEFD_KCAN_CMD_REG 0x400
68 #define KVASER_PCIEFD_KCAN_IEN_REG 0x408
69 #define KVASER_PCIEFD_KCAN_IRQ_REG 0x410
70 #define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG 0x414
71 #define KVASER_PCIEFD_KCAN_STAT_REG 0x418
72 #define KVASER_PCIEFD_KCAN_MODE_REG 0x41c
73 #define KVASER_PCIEFD_KCAN_BTRN_REG 0x420
74 #define KVASER_PCIEFD_KCAN_BUS_LOAD_REG 0x424
75 #define KVASER_PCIEFD_KCAN_BTRD_REG 0x428
76 #define KVASER_PCIEFD_KCAN_PWM_REG 0x430
77 /* System identification and information registers */
78 #define KVASER_PCIEFD_SYSID_VERSION_REG 0x8
79 #define KVASER_PCIEFD_SYSID_CANFREQ_REG 0xc
80 #define KVASER_PCIEFD_SYSID_BUSFREQ_REG 0x10
81 #define KVASER_PCIEFD_SYSID_BUILD_REG 0x14
82 /* Shared receive buffer FIFO registers */
83 #define KVASER_PCIEFD_SRB_FIFO_LAST_REG 0x1f4
84 /* Shared receive buffer registers */
85 #define KVASER_PCIEFD_SRB_CMD_REG 0x0
86 #define KVASER_PCIEFD_SRB_IEN_REG 0x04
87 #define KVASER_PCIEFD_SRB_IRQ_REG 0x0c
88 #define KVASER_PCIEFD_SRB_STAT_REG 0x10
89 #define KVASER_PCIEFD_SRB_RX_NR_PACKETS_REG 0x14
90 #define KVASER_PCIEFD_SRB_CTRL_REG 0x18
91
92 /* System build information fields */
93 #define KVASER_PCIEFD_SYSID_VERSION_NR_CHAN_MASK GENMASK(31, 24)
94 #define KVASER_PCIEFD_SYSID_VERSION_MAJOR_MASK GENMASK(23, 16)
95 #define KVASER_PCIEFD_SYSID_VERSION_MINOR_MASK GENMASK(7, 0)
96 #define KVASER_PCIEFD_SYSID_BUILD_SEQ_MASK GENMASK(15, 1)
97
98 /* Reset DMA buffer 0, 1 and FIFO offset */
99 #define KVASER_PCIEFD_SRB_CMD_RDB1 BIT(5)
100 #define KVASER_PCIEFD_SRB_CMD_RDB0 BIT(4)
101 #define KVASER_PCIEFD_SRB_CMD_FOR BIT(0)
102
103 /* DMA underflow, buffer 0 and 1 */
104 #define KVASER_PCIEFD_SRB_IRQ_DUF1 BIT(13)
105 #define KVASER_PCIEFD_SRB_IRQ_DUF0 BIT(12)
106 /* DMA overflow, buffer 0 and 1 */
107 #define KVASER_PCIEFD_SRB_IRQ_DOF1 BIT(11)
108 #define KVASER_PCIEFD_SRB_IRQ_DOF0 BIT(10)
109 /* DMA packet done, buffer 0 and 1 */
110 #define KVASER_PCIEFD_SRB_IRQ_DPD1 BIT(9)
111 #define KVASER_PCIEFD_SRB_IRQ_DPD0 BIT(8)
112
113 /* Got DMA support */
114 #define KVASER_PCIEFD_SRB_STAT_DMA BIT(24)
115 /* DMA idle */
116 #define KVASER_PCIEFD_SRB_STAT_DI BIT(15)
117
118 /* SRB current packet level */
119 #define KVASER_PCIEFD_SRB_RX_NR_PACKETS_MASK GENMASK(7, 0)
120
121 /* DMA Enable */
122 #define KVASER_PCIEFD_SRB_CTRL_DMA_ENABLE BIT(0)
123
124 /* KCAN CTRL packet types */
125 #define KVASER_PCIEFD_KCAN_CTRL_TYPE_MASK GENMASK(31, 29)
126 #define KVASER_PCIEFD_KCAN_CTRL_TYPE_EFLUSH 0x4
127 #define KVASER_PCIEFD_KCAN_CTRL_TYPE_EFRAME 0x5
128
129 /* Command sequence number */
130 #define KVASER_PCIEFD_KCAN_CMD_SEQ_MASK GENMASK(23, 16)
131 /* Command bits */
132 #define KVASER_PCIEFD_KCAN_CMD_MASK GENMASK(5, 0)
133 /* Abort, flush and reset */
134 #define KVASER_PCIEFD_KCAN_CMD_AT BIT(1)
135 /* Request status packet */
136 #define KVASER_PCIEFD_KCAN_CMD_SRQ BIT(0)
137
138 /* Transmitter unaligned */
139 #define KVASER_PCIEFD_KCAN_IRQ_TAL BIT(17)
140 /* Tx FIFO empty */
141 #define KVASER_PCIEFD_KCAN_IRQ_TE BIT(16)
142 /* Tx FIFO overflow */
143 #define KVASER_PCIEFD_KCAN_IRQ_TOF BIT(15)
144 /* Tx buffer flush done */
145 #define KVASER_PCIEFD_KCAN_IRQ_TFD BIT(14)
146 /* Abort done */
147 #define KVASER_PCIEFD_KCAN_IRQ_ABD BIT(13)
148 /* Rx FIFO overflow */
149 #define KVASER_PCIEFD_KCAN_IRQ_ROF BIT(5)
150 /* FDF bit when controller is in classic CAN mode */
151 #define KVASER_PCIEFD_KCAN_IRQ_FDIC BIT(3)
152 /* Bus parameter protection error */
153 #define KVASER_PCIEFD_KCAN_IRQ_BPP BIT(2)
154 /* Tx FIFO unaligned end */
155 #define KVASER_PCIEFD_KCAN_IRQ_TAE BIT(1)
156 /* Tx FIFO unaligned read */
157 #define KVASER_PCIEFD_KCAN_IRQ_TAR BIT(0)
158
159 /* Tx FIFO size */
160 #define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_MAX_MASK GENMASK(23, 16)
161 /* Tx FIFO current packet level */
162 #define KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK GENMASK(7, 0)
163
164 /* Current status packet sequence number */
165 #define KVASER_PCIEFD_KCAN_STAT_SEQNO_MASK GENMASK(31, 24)
166 /* Controller got CAN FD capability */
167 #define KVASER_PCIEFD_KCAN_STAT_FD BIT(19)
168 /* Controller got one-shot capability */
169 #define KVASER_PCIEFD_KCAN_STAT_CAP BIT(16)
170 /* Controller in reset mode */
171 #define KVASER_PCIEFD_KCAN_STAT_IRM BIT(15)
172 /* Reset mode request */
173 #define KVASER_PCIEFD_KCAN_STAT_RMR BIT(14)
174 /* Bus off */
175 #define KVASER_PCIEFD_KCAN_STAT_BOFF BIT(11)
176 /* Idle state. Controller in reset mode and no abort or flush pending */
177 #define KVASER_PCIEFD_KCAN_STAT_IDLE BIT(10)
178 /* Abort request */
179 #define KVASER_PCIEFD_KCAN_STAT_AR BIT(7)
180 /* Controller is bus off */
181 #define KVASER_PCIEFD_KCAN_STAT_BUS_OFF_MASK \
182 (KVASER_PCIEFD_KCAN_STAT_AR | KVASER_PCIEFD_KCAN_STAT_BOFF | \
183 KVASER_PCIEFD_KCAN_STAT_RMR | KVASER_PCIEFD_KCAN_STAT_IRM)
184
185 /* Classic CAN mode */
186 #define KVASER_PCIEFD_KCAN_MODE_CCM BIT(31)
187 /* Active error flag enable. Clear to force error passive */
188 #define KVASER_PCIEFD_KCAN_MODE_EEN BIT(23)
189 /* Acknowledgment packet type */
190 #define KVASER_PCIEFD_KCAN_MODE_APT BIT(20)
191 /* CAN FD non-ISO */
192 #define KVASER_PCIEFD_KCAN_MODE_NIFDEN BIT(15)
193 /* Error packet enable */
194 #define KVASER_PCIEFD_KCAN_MODE_EPEN BIT(12)
195 /* Listen only mode */
196 #define KVASER_PCIEFD_KCAN_MODE_LOM BIT(9)
197 /* Reset mode */
198 #define KVASER_PCIEFD_KCAN_MODE_RM BIT(8)
199
200 /* BTRN and BTRD fields */
201 #define KVASER_PCIEFD_KCAN_BTRN_TSEG2_MASK GENMASK(30, 26)
202 #define KVASER_PCIEFD_KCAN_BTRN_TSEG1_MASK GENMASK(25, 17)
203 #define KVASER_PCIEFD_KCAN_BTRN_SJW_MASK GENMASK(16, 13)
204 #define KVASER_PCIEFD_KCAN_BTRN_BRP_MASK GENMASK(12, 0)
205
206 /* PWM Control fields */
207 #define KVASER_PCIEFD_KCAN_PWM_TOP_MASK GENMASK(23, 16)
208 #define KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK GENMASK(7, 0)
209
210 /* KCAN packet type IDs */
211 #define KVASER_PCIEFD_PACK_TYPE_DATA 0x0
212 #define KVASER_PCIEFD_PACK_TYPE_ACK 0x1
213 #define KVASER_PCIEFD_PACK_TYPE_TXRQ 0x2
214 #define KVASER_PCIEFD_PACK_TYPE_ERROR 0x3
215 #define KVASER_PCIEFD_PACK_TYPE_EFLUSH_ACK 0x4
216 #define KVASER_PCIEFD_PACK_TYPE_EFRAME_ACK 0x5
217 #define KVASER_PCIEFD_PACK_TYPE_ACK_DATA 0x6
218 #define KVASER_PCIEFD_PACK_TYPE_STATUS 0x8
219 #define KVASER_PCIEFD_PACK_TYPE_BUS_LOAD 0x9
220
221 /* Common KCAN packet definitions, second word */
222 #define KVASER_PCIEFD_PACKET_TYPE_MASK GENMASK(31, 28)
223 #define KVASER_PCIEFD_PACKET_CHID_MASK GENMASK(27, 25)
224 #define KVASER_PCIEFD_PACKET_SEQ_MASK GENMASK(7, 0)
225
226 /* KCAN Transmit/Receive data packet, first word */
227 #define KVASER_PCIEFD_RPACKET_IDE BIT(30)
228 #define KVASER_PCIEFD_RPACKET_RTR BIT(29)
229 #define KVASER_PCIEFD_RPACKET_ID_MASK GENMASK(28, 0)
230 /* KCAN Transmit data packet, second word */
231 #define KVASER_PCIEFD_TPACKET_AREQ BIT(31)
232 #define KVASER_PCIEFD_TPACKET_SMS BIT(16)
233 /* KCAN Transmit/Receive data packet, second word */
234 #define KVASER_PCIEFD_RPACKET_FDF BIT(15)
235 #define KVASER_PCIEFD_RPACKET_BRS BIT(14)
236 #define KVASER_PCIEFD_RPACKET_ESI BIT(13)
237 #define KVASER_PCIEFD_RPACKET_DLC_MASK GENMASK(11, 8)
238
239 /* KCAN Transmit acknowledge packet, first word */
240 #define KVASER_PCIEFD_APACKET_NACK BIT(11)
241 #define KVASER_PCIEFD_APACKET_ABL BIT(10)
242 #define KVASER_PCIEFD_APACKET_CT BIT(9)
243 #define KVASER_PCIEFD_APACKET_FLU BIT(8)
244
245 /* KCAN Status packet, first word */
246 #define KVASER_PCIEFD_SPACK_RMCD BIT(22)
247 #define KVASER_PCIEFD_SPACK_IRM BIT(21)
248 #define KVASER_PCIEFD_SPACK_IDET BIT(20)
249 #define KVASER_PCIEFD_SPACK_BOFF BIT(16)
250 #define KVASER_PCIEFD_SPACK_RXERR_MASK GENMASK(15, 8)
251 #define KVASER_PCIEFD_SPACK_TXERR_MASK GENMASK(7, 0)
252 /* KCAN Status packet, second word */
253 #define KVASER_PCIEFD_SPACK_EPLR BIT(24)
254 #define KVASER_PCIEFD_SPACK_EWLR BIT(23)
255 #define KVASER_PCIEFD_SPACK_AUTO BIT(21)
256
257 /* KCAN Error detected packet, second word */
258 #define KVASER_PCIEFD_EPACK_DIR_TX BIT(0)
259
260 /* Macros for calculating addresses of registers */
261 #define KVASER_PCIEFD_GET_BLOCK_ADDR(pcie, block) \
262 ((pcie)->reg_base + (pcie)->driver_data->address_offset->block)
263 #define KVASER_PCIEFD_PCI_IEN_ADDR(pcie) \
264 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), pci_ien))
265 #define KVASER_PCIEFD_PCI_IRQ_ADDR(pcie) \
266 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), pci_irq))
267 #define KVASER_PCIEFD_SERDES_ADDR(pcie) \
268 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), serdes))
269 #define KVASER_PCIEFD_SYSID_ADDR(pcie) \
270 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), sysid))
271 #define KVASER_PCIEFD_LOOPBACK_ADDR(pcie) \
272 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), loopback))
273 #define KVASER_PCIEFD_SRB_FIFO_ADDR(pcie) \
274 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_srb_fifo))
275 #define KVASER_PCIEFD_SRB_ADDR(pcie) \
276 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_srb))
277 #define KVASER_PCIEFD_KCAN_CH0_ADDR(pcie) \
278 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_ch0))
279 #define KVASER_PCIEFD_KCAN_CH1_ADDR(pcie) \
280 (KVASER_PCIEFD_GET_BLOCK_ADDR((pcie), kcan_ch1))
281 #define KVASER_PCIEFD_KCAN_CHANNEL_SPAN(pcie) \
282 (KVASER_PCIEFD_KCAN_CH1_ADDR((pcie)) - KVASER_PCIEFD_KCAN_CH0_ADDR((pcie)))
283 #define KVASER_PCIEFD_KCAN_CHX_ADDR(pcie, i) \
284 (KVASER_PCIEFD_KCAN_CH0_ADDR((pcie)) + (i) * KVASER_PCIEFD_KCAN_CHANNEL_SPAN((pcie)))
285
286 struct kvaser_pciefd;
287 static void kvaser_pciefd_write_dma_map_altera(struct kvaser_pciefd *pcie,
288 dma_addr_t addr, int index);
289 static void kvaser_pciefd_write_dma_map_sf2(struct kvaser_pciefd *pcie,
290 dma_addr_t addr, int index);
291 static void kvaser_pciefd_write_dma_map_xilinx(struct kvaser_pciefd *pcie,
292 dma_addr_t addr, int index);
293
294 struct kvaser_pciefd_address_offset {
295 u32 serdes;
296 u32 pci_ien;
297 u32 pci_irq;
298 u32 sysid;
299 u32 loopback;
300 u32 kcan_srb_fifo;
301 u32 kcan_srb;
302 u32 kcan_ch0;
303 u32 kcan_ch1;
304 };
305
306 struct kvaser_pciefd_dev_ops {
307 void (*kvaser_pciefd_write_dma_map)(struct kvaser_pciefd *pcie,
308 dma_addr_t addr, int index);
309 };
310
311 struct kvaser_pciefd_irq_mask {
312 u32 kcan_rx0;
313 u32 kcan_tx[KVASER_PCIEFD_MAX_CAN_CHANNELS];
314 u32 all;
315 };
316
317 struct kvaser_pciefd_driver_data {
318 const struct kvaser_pciefd_address_offset *address_offset;
319 const struct kvaser_pciefd_irq_mask *irq_mask;
320 const struct kvaser_pciefd_dev_ops *ops;
321 };
322
323 static const struct kvaser_pciefd_address_offset kvaser_pciefd_altera_address_offset = {
324 .serdes = 0x1000,
325 .pci_ien = 0x50,
326 .pci_irq = 0x40,
327 .sysid = 0x1f020,
328 .loopback = 0x1f000,
329 .kcan_srb_fifo = 0x1f200,
330 .kcan_srb = 0x1f400,
331 .kcan_ch0 = 0x10000,
332 .kcan_ch1 = 0x11000,
333 };
334
335 static const struct kvaser_pciefd_address_offset kvaser_pciefd_sf2_address_offset = {
336 .serdes = 0x280c8,
337 .pci_ien = 0x102004,
338 .pci_irq = 0x102008,
339 .sysid = 0x100000,
340 .loopback = 0x103000,
341 .kcan_srb_fifo = 0x120000,
342 .kcan_srb = 0x121000,
343 .kcan_ch0 = 0x140000,
344 .kcan_ch1 = 0x142000,
345 };
346
347 static const struct kvaser_pciefd_address_offset kvaser_pciefd_xilinx_address_offset = {
348 .serdes = 0x00208,
349 .pci_ien = 0x102004,
350 .pci_irq = 0x102008,
351 .sysid = 0x100000,
352 .loopback = 0x103000,
353 .kcan_srb_fifo = 0x120000,
354 .kcan_srb = 0x121000,
355 .kcan_ch0 = 0x140000,
356 .kcan_ch1 = 0x142000,
357 };
358
359 static const struct kvaser_pciefd_irq_mask kvaser_pciefd_altera_irq_mask = {
360 .kcan_rx0 = BIT(4),
361 .kcan_tx = { BIT(0), BIT(1), BIT(2), BIT(3) },
362 .all = GENMASK(4, 0),
363 };
364
365 static const struct kvaser_pciefd_irq_mask kvaser_pciefd_sf2_irq_mask = {
366 .kcan_rx0 = BIT(4),
367 .kcan_tx = { BIT(16), BIT(17), BIT(18), BIT(19) },
368 .all = GENMASK(19, 16) | BIT(4),
369 };
370
371 static const struct kvaser_pciefd_irq_mask kvaser_pciefd_xilinx_irq_mask = {
372 .kcan_rx0 = BIT(4),
373 .kcan_tx = { BIT(16), BIT(17), BIT(18), BIT(19), BIT(20), BIT(21), BIT(22), BIT(23) },
374 .all = GENMASK(23, 16) | BIT(4),
375 };
376
377 static const struct kvaser_pciefd_dev_ops kvaser_pciefd_altera_dev_ops = {
378 .kvaser_pciefd_write_dma_map = kvaser_pciefd_write_dma_map_altera,
379 };
380
381 static const struct kvaser_pciefd_dev_ops kvaser_pciefd_sf2_dev_ops = {
382 .kvaser_pciefd_write_dma_map = kvaser_pciefd_write_dma_map_sf2,
383 };
384
385 static const struct kvaser_pciefd_dev_ops kvaser_pciefd_xilinx_dev_ops = {
386 .kvaser_pciefd_write_dma_map = kvaser_pciefd_write_dma_map_xilinx,
387 };
388
389 static const struct kvaser_pciefd_driver_data kvaser_pciefd_altera_driver_data = {
390 .address_offset = &kvaser_pciefd_altera_address_offset,
391 .irq_mask = &kvaser_pciefd_altera_irq_mask,
392 .ops = &kvaser_pciefd_altera_dev_ops,
393 };
394
395 static const struct kvaser_pciefd_driver_data kvaser_pciefd_sf2_driver_data = {
396 .address_offset = &kvaser_pciefd_sf2_address_offset,
397 .irq_mask = &kvaser_pciefd_sf2_irq_mask,
398 .ops = &kvaser_pciefd_sf2_dev_ops,
399 };
400
401 static const struct kvaser_pciefd_driver_data kvaser_pciefd_xilinx_driver_data = {
402 .address_offset = &kvaser_pciefd_xilinx_address_offset,
403 .irq_mask = &kvaser_pciefd_xilinx_irq_mask,
404 .ops = &kvaser_pciefd_xilinx_dev_ops,
405 };
406
407 struct kvaser_pciefd_can {
408 struct can_priv can;
409 struct kvaser_pciefd *kv_pcie;
410 void __iomem *reg_base;
411 struct can_berr_counter bec;
412 u8 cmd_seq;
413 int err_rep_cnt;
414 int echo_idx;
415 spinlock_t lock; /* Locks sensitive registers (e.g. MODE) */
416 spinlock_t echo_lock; /* Locks the message echo buffer */
417 struct timer_list bec_poll_timer;
418 struct completion start_comp, flush_comp;
419 };
420
421 struct kvaser_pciefd {
422 struct pci_dev *pci;
423 void __iomem *reg_base;
424 struct kvaser_pciefd_can *can[KVASER_PCIEFD_MAX_CAN_CHANNELS];
425 const struct kvaser_pciefd_driver_data *driver_data;
426 void *dma_data[KVASER_PCIEFD_DMA_COUNT];
427 u8 nr_channels;
428 u32 bus_freq;
429 u32 freq;
430 u32 freq_to_ticks_div;
431 };
432
433 struct kvaser_pciefd_rx_packet {
434 u32 header[2];
435 u64 timestamp;
436 };
437
438 struct kvaser_pciefd_tx_packet {
439 u32 header[2];
440 u8 data[64];
441 };
442
443 static const struct can_bittiming_const kvaser_pciefd_bittiming_const = {
444 .name = KVASER_PCIEFD_DRV_NAME,
445 .tseg1_min = 1,
446 .tseg1_max = 512,
447 .tseg2_min = 1,
448 .tseg2_max = 32,
449 .sjw_max = 16,
450 .brp_min = 1,
451 .brp_max = 8192,
452 .brp_inc = 1,
453 };
454
455 static struct pci_device_id kvaser_pciefd_id_table[] = {
456 {
457 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_4HS_DEVICE_ID),
458 .driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
459 },
460 {
461 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_2HS_V2_DEVICE_ID),
462 .driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
463 },
464 {
465 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_HS_V2_DEVICE_ID),
466 .driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
467 },
468 {
469 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_HS_V2_DEVICE_ID),
470 .driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
471 },
472 {
473 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_2HS_V2_DEVICE_ID),
474 .driver_data = (kernel_ulong_t)&kvaser_pciefd_altera_driver_data,
475 },
476 {
477 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_2CAN_V3_DEVICE_ID),
478 .driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
479 },
480 {
481 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_1CAN_V3_DEVICE_ID),
482 .driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
483 },
484 {
485 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_4CAN_V2_DEVICE_ID),
486 .driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
487 },
488 {
489 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_2CAN_V3_DEVICE_ID),
490 .driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
491 },
492 {
493 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_MINIPCIE_1CAN_V3_DEVICE_ID),
494 .driver_data = (kernel_ulong_t)&kvaser_pciefd_sf2_driver_data,
495 },
496 {
497 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_M2_4CAN_DEVICE_ID),
498 .driver_data = (kernel_ulong_t)&kvaser_pciefd_xilinx_driver_data,
499 },
500 {
501 PCI_DEVICE(KVASER_PCIEFD_VENDOR, KVASER_PCIEFD_8CAN_DEVICE_ID),
502 .driver_data = (kernel_ulong_t)&kvaser_pciefd_xilinx_driver_data,
503 },
504 {
505 0,
506 },
507 };
508 MODULE_DEVICE_TABLE(pci, kvaser_pciefd_id_table);
509
kvaser_pciefd_send_kcan_cmd(struct kvaser_pciefd_can * can,u32 cmd)510 static inline void kvaser_pciefd_send_kcan_cmd(struct kvaser_pciefd_can *can, u32 cmd)
511 {
512 iowrite32(FIELD_PREP(KVASER_PCIEFD_KCAN_CMD_MASK, cmd) |
513 FIELD_PREP(KVASER_PCIEFD_KCAN_CMD_SEQ_MASK, ++can->cmd_seq),
514 can->reg_base + KVASER_PCIEFD_KCAN_CMD_REG);
515 }
516
kvaser_pciefd_request_status(struct kvaser_pciefd_can * can)517 static inline void kvaser_pciefd_request_status(struct kvaser_pciefd_can *can)
518 {
519 kvaser_pciefd_send_kcan_cmd(can, KVASER_PCIEFD_KCAN_CMD_SRQ);
520 }
521
kvaser_pciefd_abort_flush_reset(struct kvaser_pciefd_can * can)522 static inline void kvaser_pciefd_abort_flush_reset(struct kvaser_pciefd_can *can)
523 {
524 kvaser_pciefd_send_kcan_cmd(can, KVASER_PCIEFD_KCAN_CMD_AT);
525 }
526
kvaser_pciefd_enable_err_gen(struct kvaser_pciefd_can * can)527 static void kvaser_pciefd_enable_err_gen(struct kvaser_pciefd_can *can)
528 {
529 u32 mode;
530 unsigned long irq;
531
532 spin_lock_irqsave(&can->lock, irq);
533 mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
534 if (!(mode & KVASER_PCIEFD_KCAN_MODE_EPEN)) {
535 mode |= KVASER_PCIEFD_KCAN_MODE_EPEN;
536 iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
537 }
538 spin_unlock_irqrestore(&can->lock, irq);
539 }
540
kvaser_pciefd_disable_err_gen(struct kvaser_pciefd_can * can)541 static void kvaser_pciefd_disable_err_gen(struct kvaser_pciefd_can *can)
542 {
543 u32 mode;
544 unsigned long irq;
545
546 spin_lock_irqsave(&can->lock, irq);
547 mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
548 mode &= ~KVASER_PCIEFD_KCAN_MODE_EPEN;
549 iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
550 spin_unlock_irqrestore(&can->lock, irq);
551 }
552
kvaser_pciefd_set_tx_irq(struct kvaser_pciefd_can * can)553 static void kvaser_pciefd_set_tx_irq(struct kvaser_pciefd_can *can)
554 {
555 u32 msk;
556
557 msk = KVASER_PCIEFD_KCAN_IRQ_TE | KVASER_PCIEFD_KCAN_IRQ_ROF |
558 KVASER_PCIEFD_KCAN_IRQ_TOF | KVASER_PCIEFD_KCAN_IRQ_ABD |
559 KVASER_PCIEFD_KCAN_IRQ_TAE | KVASER_PCIEFD_KCAN_IRQ_TAL |
560 KVASER_PCIEFD_KCAN_IRQ_FDIC | KVASER_PCIEFD_KCAN_IRQ_BPP |
561 KVASER_PCIEFD_KCAN_IRQ_TAR;
562
563 iowrite32(msk, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
564 }
565
kvaser_pciefd_set_skb_timestamp(const struct kvaser_pciefd * pcie,struct sk_buff * skb,u64 timestamp)566 static inline void kvaser_pciefd_set_skb_timestamp(const struct kvaser_pciefd *pcie,
567 struct sk_buff *skb, u64 timestamp)
568 {
569 skb_hwtstamps(skb)->hwtstamp =
570 ns_to_ktime(div_u64(timestamp * 1000, pcie->freq_to_ticks_div));
571 }
572
kvaser_pciefd_setup_controller(struct kvaser_pciefd_can * can)573 static void kvaser_pciefd_setup_controller(struct kvaser_pciefd_can *can)
574 {
575 u32 mode;
576 unsigned long irq;
577
578 spin_lock_irqsave(&can->lock, irq);
579 mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
580 if (can->can.ctrlmode & CAN_CTRLMODE_FD) {
581 mode &= ~KVASER_PCIEFD_KCAN_MODE_CCM;
582 if (can->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)
583 mode |= KVASER_PCIEFD_KCAN_MODE_NIFDEN;
584 else
585 mode &= ~KVASER_PCIEFD_KCAN_MODE_NIFDEN;
586 } else {
587 mode |= KVASER_PCIEFD_KCAN_MODE_CCM;
588 mode &= ~KVASER_PCIEFD_KCAN_MODE_NIFDEN;
589 }
590
591 if (can->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
592 mode |= KVASER_PCIEFD_KCAN_MODE_LOM;
593 else
594 mode &= ~KVASER_PCIEFD_KCAN_MODE_LOM;
595 mode |= KVASER_PCIEFD_KCAN_MODE_EEN;
596 mode |= KVASER_PCIEFD_KCAN_MODE_EPEN;
597 /* Use ACK packet type */
598 mode &= ~KVASER_PCIEFD_KCAN_MODE_APT;
599 mode &= ~KVASER_PCIEFD_KCAN_MODE_RM;
600 iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
601
602 spin_unlock_irqrestore(&can->lock, irq);
603 }
604
kvaser_pciefd_start_controller_flush(struct kvaser_pciefd_can * can)605 static void kvaser_pciefd_start_controller_flush(struct kvaser_pciefd_can *can)
606 {
607 u32 status;
608 unsigned long irq;
609
610 spin_lock_irqsave(&can->lock, irq);
611 iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
612 iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
613 can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
614 status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
615 if (status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
616 /* If controller is already idle, run abort, flush and reset */
617 kvaser_pciefd_abort_flush_reset(can);
618 } else if (!(status & KVASER_PCIEFD_KCAN_STAT_RMR)) {
619 u32 mode;
620
621 /* Put controller in reset mode */
622 mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
623 mode |= KVASER_PCIEFD_KCAN_MODE_RM;
624 iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
625 }
626 spin_unlock_irqrestore(&can->lock, irq);
627 }
628
kvaser_pciefd_bus_on(struct kvaser_pciefd_can * can)629 static int kvaser_pciefd_bus_on(struct kvaser_pciefd_can *can)
630 {
631 u32 mode;
632 unsigned long irq;
633
634 del_timer(&can->bec_poll_timer);
635 if (!completion_done(&can->flush_comp))
636 kvaser_pciefd_start_controller_flush(can);
637
638 if (!wait_for_completion_timeout(&can->flush_comp,
639 KVASER_PCIEFD_WAIT_TIMEOUT)) {
640 netdev_err(can->can.dev, "Timeout during bus on flush\n");
641 return -ETIMEDOUT;
642 }
643
644 spin_lock_irqsave(&can->lock, irq);
645 iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
646 iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
647 iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
648 can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
649 mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
650 mode &= ~KVASER_PCIEFD_KCAN_MODE_RM;
651 iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
652 spin_unlock_irqrestore(&can->lock, irq);
653
654 if (!wait_for_completion_timeout(&can->start_comp,
655 KVASER_PCIEFD_WAIT_TIMEOUT)) {
656 netdev_err(can->can.dev, "Timeout during bus on reset\n");
657 return -ETIMEDOUT;
658 }
659 /* Reset interrupt handling */
660 iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
661 iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
662
663 kvaser_pciefd_set_tx_irq(can);
664 kvaser_pciefd_setup_controller(can);
665 can->can.state = CAN_STATE_ERROR_ACTIVE;
666 netif_wake_queue(can->can.dev);
667 can->bec.txerr = 0;
668 can->bec.rxerr = 0;
669 can->err_rep_cnt = 0;
670
671 return 0;
672 }
673
kvaser_pciefd_pwm_stop(struct kvaser_pciefd_can * can)674 static void kvaser_pciefd_pwm_stop(struct kvaser_pciefd_can *can)
675 {
676 u8 top;
677 u32 pwm_ctrl;
678 unsigned long irq;
679
680 spin_lock_irqsave(&can->lock, irq);
681 pwm_ctrl = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
682 top = FIELD_GET(KVASER_PCIEFD_KCAN_PWM_TOP_MASK, pwm_ctrl);
683 /* Set duty cycle to zero */
684 pwm_ctrl |= FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK, top);
685 iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
686 spin_unlock_irqrestore(&can->lock, irq);
687 }
688
kvaser_pciefd_pwm_start(struct kvaser_pciefd_can * can)689 static void kvaser_pciefd_pwm_start(struct kvaser_pciefd_can *can)
690 {
691 int top, trigger;
692 u32 pwm_ctrl;
693 unsigned long irq;
694
695 kvaser_pciefd_pwm_stop(can);
696 spin_lock_irqsave(&can->lock, irq);
697 /* Set frequency to 500 KHz */
698 top = can->kv_pcie->bus_freq / (2 * 500000) - 1;
699
700 pwm_ctrl = FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK, top);
701 pwm_ctrl |= FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TOP_MASK, top);
702 iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
703
704 /* Set duty cycle to 95 */
705 trigger = (100 * top - 95 * (top + 1) + 50) / 100;
706 pwm_ctrl = FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TRIGGER_MASK, trigger);
707 pwm_ctrl |= FIELD_PREP(KVASER_PCIEFD_KCAN_PWM_TOP_MASK, top);
708 iowrite32(pwm_ctrl, can->reg_base + KVASER_PCIEFD_KCAN_PWM_REG);
709 spin_unlock_irqrestore(&can->lock, irq);
710 }
711
kvaser_pciefd_open(struct net_device * netdev)712 static int kvaser_pciefd_open(struct net_device *netdev)
713 {
714 int err;
715 struct kvaser_pciefd_can *can = netdev_priv(netdev);
716
717 err = open_candev(netdev);
718 if (err)
719 return err;
720
721 err = kvaser_pciefd_bus_on(can);
722 if (err) {
723 close_candev(netdev);
724 return err;
725 }
726
727 return 0;
728 }
729
kvaser_pciefd_stop(struct net_device * netdev)730 static int kvaser_pciefd_stop(struct net_device *netdev)
731 {
732 struct kvaser_pciefd_can *can = netdev_priv(netdev);
733 int ret = 0;
734
735 /* Don't interrupt ongoing flush */
736 if (!completion_done(&can->flush_comp))
737 kvaser_pciefd_start_controller_flush(can);
738
739 if (!wait_for_completion_timeout(&can->flush_comp,
740 KVASER_PCIEFD_WAIT_TIMEOUT)) {
741 netdev_err(can->can.dev, "Timeout during stop\n");
742 ret = -ETIMEDOUT;
743 } else {
744 iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
745 del_timer(&can->bec_poll_timer);
746 }
747 can->can.state = CAN_STATE_STOPPED;
748 close_candev(netdev);
749
750 return ret;
751 }
752
kvaser_pciefd_prepare_tx_packet(struct kvaser_pciefd_tx_packet * p,struct kvaser_pciefd_can * can,struct sk_buff * skb)753 static int kvaser_pciefd_prepare_tx_packet(struct kvaser_pciefd_tx_packet *p,
754 struct kvaser_pciefd_can *can,
755 struct sk_buff *skb)
756 {
757 struct canfd_frame *cf = (struct canfd_frame *)skb->data;
758 int packet_size;
759 int seq = can->echo_idx;
760
761 memset(p, 0, sizeof(*p));
762 if (can->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
763 p->header[1] |= KVASER_PCIEFD_TPACKET_SMS;
764
765 if (cf->can_id & CAN_RTR_FLAG)
766 p->header[0] |= KVASER_PCIEFD_RPACKET_RTR;
767
768 if (cf->can_id & CAN_EFF_FLAG)
769 p->header[0] |= KVASER_PCIEFD_RPACKET_IDE;
770
771 p->header[0] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_ID_MASK, cf->can_id);
772 p->header[1] |= KVASER_PCIEFD_TPACKET_AREQ;
773
774 if (can_is_canfd_skb(skb)) {
775 p->header[1] |= FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK,
776 can_fd_len2dlc(cf->len));
777 p->header[1] |= KVASER_PCIEFD_RPACKET_FDF;
778 if (cf->flags & CANFD_BRS)
779 p->header[1] |= KVASER_PCIEFD_RPACKET_BRS;
780 if (cf->flags & CANFD_ESI)
781 p->header[1] |= KVASER_PCIEFD_RPACKET_ESI;
782 } else {
783 p->header[1] |=
784 FIELD_PREP(KVASER_PCIEFD_RPACKET_DLC_MASK,
785 can_get_cc_dlc((struct can_frame *)cf, can->can.ctrlmode));
786 }
787
788 p->header[1] |= FIELD_PREP(KVASER_PCIEFD_PACKET_SEQ_MASK, seq);
789
790 packet_size = cf->len;
791 memcpy(p->data, cf->data, packet_size);
792
793 return DIV_ROUND_UP(packet_size, 4);
794 }
795
kvaser_pciefd_start_xmit(struct sk_buff * skb,struct net_device * netdev)796 static netdev_tx_t kvaser_pciefd_start_xmit(struct sk_buff *skb,
797 struct net_device *netdev)
798 {
799 struct kvaser_pciefd_can *can = netdev_priv(netdev);
800 unsigned long irq_flags;
801 struct kvaser_pciefd_tx_packet packet;
802 int nr_words;
803 u8 count;
804
805 if (can_dev_dropped_skb(netdev, skb))
806 return NETDEV_TX_OK;
807
808 nr_words = kvaser_pciefd_prepare_tx_packet(&packet, can, skb);
809
810 spin_lock_irqsave(&can->echo_lock, irq_flags);
811 /* Prepare and save echo skb in internal slot */
812 can_put_echo_skb(skb, netdev, can->echo_idx, 0);
813
814 /* Move echo index to the next slot */
815 can->echo_idx = (can->echo_idx + 1) % can->can.echo_skb_max;
816
817 /* Write header to fifo */
818 iowrite32(packet.header[0],
819 can->reg_base + KVASER_PCIEFD_KCAN_FIFO_REG);
820 iowrite32(packet.header[1],
821 can->reg_base + KVASER_PCIEFD_KCAN_FIFO_REG);
822
823 if (nr_words) {
824 u32 data_last = ((u32 *)packet.data)[nr_words - 1];
825
826 /* Write data to fifo, except last word */
827 iowrite32_rep(can->reg_base +
828 KVASER_PCIEFD_KCAN_FIFO_REG, packet.data,
829 nr_words - 1);
830 /* Write last word to end of fifo */
831 __raw_writel(data_last, can->reg_base +
832 KVASER_PCIEFD_KCAN_FIFO_LAST_REG);
833 } else {
834 /* Complete write to fifo */
835 __raw_writel(0, can->reg_base +
836 KVASER_PCIEFD_KCAN_FIFO_LAST_REG);
837 }
838
839 count = FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK,
840 ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
841 /* No room for a new message, stop the queue until at least one
842 * successful transmit
843 */
844 if (count >= can->can.echo_skb_max || can->can.echo_skb[can->echo_idx])
845 netif_stop_queue(netdev);
846 spin_unlock_irqrestore(&can->echo_lock, irq_flags);
847
848 return NETDEV_TX_OK;
849 }
850
kvaser_pciefd_set_bittiming(struct kvaser_pciefd_can * can,bool data)851 static int kvaser_pciefd_set_bittiming(struct kvaser_pciefd_can *can, bool data)
852 {
853 u32 mode, test, btrn;
854 unsigned long irq_flags;
855 int ret;
856 struct can_bittiming *bt;
857
858 if (data)
859 bt = &can->can.data_bittiming;
860 else
861 bt = &can->can.bittiming;
862
863 btrn = FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_TSEG2_MASK, bt->phase_seg2 - 1) |
864 FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_TSEG1_MASK, bt->prop_seg + bt->phase_seg1 - 1) |
865 FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_SJW_MASK, bt->sjw - 1) |
866 FIELD_PREP(KVASER_PCIEFD_KCAN_BTRN_BRP_MASK, bt->brp - 1);
867
868 spin_lock_irqsave(&can->lock, irq_flags);
869 mode = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
870 /* Put the circuit in reset mode */
871 iowrite32(mode | KVASER_PCIEFD_KCAN_MODE_RM,
872 can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
873
874 /* Can only set bittiming if in reset mode */
875 ret = readl_poll_timeout(can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG,
876 test, test & KVASER_PCIEFD_KCAN_MODE_RM, 0, 10);
877 if (ret) {
878 spin_unlock_irqrestore(&can->lock, irq_flags);
879 return -EBUSY;
880 }
881
882 if (data)
883 iowrite32(btrn, can->reg_base + KVASER_PCIEFD_KCAN_BTRD_REG);
884 else
885 iowrite32(btrn, can->reg_base + KVASER_PCIEFD_KCAN_BTRN_REG);
886 /* Restore previous reset mode status */
887 iowrite32(mode, can->reg_base + KVASER_PCIEFD_KCAN_MODE_REG);
888 spin_unlock_irqrestore(&can->lock, irq_flags);
889
890 return 0;
891 }
892
kvaser_pciefd_set_nominal_bittiming(struct net_device * ndev)893 static int kvaser_pciefd_set_nominal_bittiming(struct net_device *ndev)
894 {
895 return kvaser_pciefd_set_bittiming(netdev_priv(ndev), false);
896 }
897
kvaser_pciefd_set_data_bittiming(struct net_device * ndev)898 static int kvaser_pciefd_set_data_bittiming(struct net_device *ndev)
899 {
900 return kvaser_pciefd_set_bittiming(netdev_priv(ndev), true);
901 }
902
kvaser_pciefd_set_mode(struct net_device * ndev,enum can_mode mode)903 static int kvaser_pciefd_set_mode(struct net_device *ndev, enum can_mode mode)
904 {
905 struct kvaser_pciefd_can *can = netdev_priv(ndev);
906 int ret = 0;
907
908 switch (mode) {
909 case CAN_MODE_START:
910 if (!can->can.restart_ms)
911 ret = kvaser_pciefd_bus_on(can);
912 break;
913 default:
914 return -EOPNOTSUPP;
915 }
916
917 return ret;
918 }
919
kvaser_pciefd_get_berr_counter(const struct net_device * ndev,struct can_berr_counter * bec)920 static int kvaser_pciefd_get_berr_counter(const struct net_device *ndev,
921 struct can_berr_counter *bec)
922 {
923 struct kvaser_pciefd_can *can = netdev_priv(ndev);
924
925 bec->rxerr = can->bec.rxerr;
926 bec->txerr = can->bec.txerr;
927
928 return 0;
929 }
930
kvaser_pciefd_bec_poll_timer(struct timer_list * data)931 static void kvaser_pciefd_bec_poll_timer(struct timer_list *data)
932 {
933 struct kvaser_pciefd_can *can = from_timer(can, data, bec_poll_timer);
934
935 kvaser_pciefd_enable_err_gen(can);
936 kvaser_pciefd_request_status(can);
937 can->err_rep_cnt = 0;
938 }
939
940 static const struct net_device_ops kvaser_pciefd_netdev_ops = {
941 .ndo_open = kvaser_pciefd_open,
942 .ndo_stop = kvaser_pciefd_stop,
943 .ndo_eth_ioctl = can_eth_ioctl_hwts,
944 .ndo_start_xmit = kvaser_pciefd_start_xmit,
945 .ndo_change_mtu = can_change_mtu,
946 };
947
948 static const struct ethtool_ops kvaser_pciefd_ethtool_ops = {
949 .get_ts_info = can_ethtool_op_get_ts_info_hwts,
950 };
951
kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd * pcie)952 static int kvaser_pciefd_setup_can_ctrls(struct kvaser_pciefd *pcie)
953 {
954 int i;
955
956 for (i = 0; i < pcie->nr_channels; i++) {
957 struct net_device *netdev;
958 struct kvaser_pciefd_can *can;
959 u32 status, tx_nr_packets_max;
960
961 netdev = alloc_candev(sizeof(struct kvaser_pciefd_can),
962 KVASER_PCIEFD_CAN_TX_MAX_COUNT);
963 if (!netdev)
964 return -ENOMEM;
965
966 can = netdev_priv(netdev);
967 netdev->netdev_ops = &kvaser_pciefd_netdev_ops;
968 netdev->ethtool_ops = &kvaser_pciefd_ethtool_ops;
969 can->reg_base = KVASER_PCIEFD_KCAN_CHX_ADDR(pcie, i);
970 can->kv_pcie = pcie;
971 can->cmd_seq = 0;
972 can->err_rep_cnt = 0;
973 can->bec.txerr = 0;
974 can->bec.rxerr = 0;
975
976 init_completion(&can->start_comp);
977 init_completion(&can->flush_comp);
978 timer_setup(&can->bec_poll_timer, kvaser_pciefd_bec_poll_timer, 0);
979
980 /* Disable Bus load reporting */
981 iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_BUS_LOAD_REG);
982
983 tx_nr_packets_max =
984 FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_MAX_MASK,
985 ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
986
987 can->can.clock.freq = pcie->freq;
988 can->can.echo_skb_max = min(KVASER_PCIEFD_CAN_TX_MAX_COUNT, tx_nr_packets_max - 1);
989 can->echo_idx = 0;
990 spin_lock_init(&can->echo_lock);
991 spin_lock_init(&can->lock);
992
993 can->can.bittiming_const = &kvaser_pciefd_bittiming_const;
994 can->can.data_bittiming_const = &kvaser_pciefd_bittiming_const;
995 can->can.do_set_bittiming = kvaser_pciefd_set_nominal_bittiming;
996 can->can.do_set_data_bittiming = kvaser_pciefd_set_data_bittiming;
997 can->can.do_set_mode = kvaser_pciefd_set_mode;
998 can->can.do_get_berr_counter = kvaser_pciefd_get_berr_counter;
999 can->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY |
1000 CAN_CTRLMODE_FD |
1001 CAN_CTRLMODE_FD_NON_ISO |
1002 CAN_CTRLMODE_CC_LEN8_DLC;
1003
1004 status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
1005 if (!(status & KVASER_PCIEFD_KCAN_STAT_FD)) {
1006 dev_err(&pcie->pci->dev,
1007 "CAN FD not supported as expected %d\n", i);
1008
1009 free_candev(netdev);
1010 return -ENODEV;
1011 }
1012
1013 if (status & KVASER_PCIEFD_KCAN_STAT_CAP)
1014 can->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
1015
1016 netdev->flags |= IFF_ECHO;
1017 SET_NETDEV_DEV(netdev, &pcie->pci->dev);
1018
1019 iowrite32(GENMASK(31, 0), can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1020 iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
1021 can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
1022
1023 pcie->can[i] = can;
1024 kvaser_pciefd_pwm_start(can);
1025 }
1026
1027 return 0;
1028 }
1029
kvaser_pciefd_reg_candev(struct kvaser_pciefd * pcie)1030 static int kvaser_pciefd_reg_candev(struct kvaser_pciefd *pcie)
1031 {
1032 int i;
1033
1034 for (i = 0; i < pcie->nr_channels; i++) {
1035 int err = register_candev(pcie->can[i]->can.dev);
1036
1037 if (err) {
1038 int j;
1039
1040 /* Unregister all successfully registered devices. */
1041 for (j = 0; j < i; j++)
1042 unregister_candev(pcie->can[j]->can.dev);
1043 return err;
1044 }
1045 }
1046
1047 return 0;
1048 }
1049
kvaser_pciefd_write_dma_map_altera(struct kvaser_pciefd * pcie,dma_addr_t addr,int index)1050 static void kvaser_pciefd_write_dma_map_altera(struct kvaser_pciefd *pcie,
1051 dma_addr_t addr, int index)
1052 {
1053 void __iomem *serdes_base;
1054 u32 word1, word2;
1055
1056 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1057 word1 = addr | KVASER_PCIEFD_ALTERA_DMA_64BIT;
1058 word2 = addr >> 32;
1059 #else
1060 word1 = addr;
1061 word2 = 0;
1062 #endif
1063 serdes_base = KVASER_PCIEFD_SERDES_ADDR(pcie) + 0x8 * index;
1064 iowrite32(word1, serdes_base);
1065 iowrite32(word2, serdes_base + 0x4);
1066 }
1067
kvaser_pciefd_write_dma_map_sf2(struct kvaser_pciefd * pcie,dma_addr_t addr,int index)1068 static void kvaser_pciefd_write_dma_map_sf2(struct kvaser_pciefd *pcie,
1069 dma_addr_t addr, int index)
1070 {
1071 void __iomem *serdes_base;
1072 u32 lsb = addr & KVASER_PCIEFD_SF2_DMA_LSB_MASK;
1073 u32 msb = 0x0;
1074
1075 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1076 msb = addr >> 32;
1077 #endif
1078 serdes_base = KVASER_PCIEFD_SERDES_ADDR(pcie) + 0x10 * index;
1079 iowrite32(lsb, serdes_base);
1080 iowrite32(msb, serdes_base + 0x4);
1081 }
1082
kvaser_pciefd_write_dma_map_xilinx(struct kvaser_pciefd * pcie,dma_addr_t addr,int index)1083 static void kvaser_pciefd_write_dma_map_xilinx(struct kvaser_pciefd *pcie,
1084 dma_addr_t addr, int index)
1085 {
1086 void __iomem *serdes_base;
1087 u32 lsb = addr & KVASER_PCIEFD_XILINX_DMA_LSB_MASK;
1088 u32 msb = 0x0;
1089
1090 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
1091 msb = addr >> 32;
1092 #endif
1093 serdes_base = KVASER_PCIEFD_SERDES_ADDR(pcie) + 0x8 * index;
1094 iowrite32(msb, serdes_base);
1095 iowrite32(lsb, serdes_base + 0x4);
1096 }
1097
kvaser_pciefd_setup_dma(struct kvaser_pciefd * pcie)1098 static int kvaser_pciefd_setup_dma(struct kvaser_pciefd *pcie)
1099 {
1100 int i;
1101 u32 srb_status;
1102 u32 srb_packet_count;
1103 dma_addr_t dma_addr[KVASER_PCIEFD_DMA_COUNT];
1104
1105 /* Disable the DMA */
1106 iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1107 for (i = 0; i < KVASER_PCIEFD_DMA_COUNT; i++) {
1108 pcie->dma_data[i] = dmam_alloc_coherent(&pcie->pci->dev,
1109 KVASER_PCIEFD_DMA_SIZE,
1110 &dma_addr[i],
1111 GFP_KERNEL);
1112
1113 if (!pcie->dma_data[i] || !dma_addr[i]) {
1114 dev_err(&pcie->pci->dev, "Rx dma_alloc(%u) failure\n",
1115 KVASER_PCIEFD_DMA_SIZE);
1116 return -ENOMEM;
1117 }
1118 pcie->driver_data->ops->kvaser_pciefd_write_dma_map(pcie, dma_addr[i], i);
1119 }
1120
1121 /* Reset Rx FIFO, and both DMA buffers */
1122 iowrite32(KVASER_PCIEFD_SRB_CMD_FOR | KVASER_PCIEFD_SRB_CMD_RDB0 |
1123 KVASER_PCIEFD_SRB_CMD_RDB1,
1124 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1125 /* Empty Rx FIFO */
1126 srb_packet_count =
1127 FIELD_GET(KVASER_PCIEFD_SRB_RX_NR_PACKETS_MASK,
1128 ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) +
1129 KVASER_PCIEFD_SRB_RX_NR_PACKETS_REG));
1130 while (srb_packet_count) {
1131 /* Drop current packet in FIFO */
1132 ioread32(KVASER_PCIEFD_SRB_FIFO_ADDR(pcie) + KVASER_PCIEFD_SRB_FIFO_LAST_REG);
1133 srb_packet_count--;
1134 }
1135
1136 srb_status = ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_STAT_REG);
1137 if (!(srb_status & KVASER_PCIEFD_SRB_STAT_DI)) {
1138 dev_err(&pcie->pci->dev, "DMA not idle before enabling\n");
1139 return -EIO;
1140 }
1141
1142 /* Enable the DMA */
1143 iowrite32(KVASER_PCIEFD_SRB_CTRL_DMA_ENABLE,
1144 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1145
1146 return 0;
1147 }
1148
kvaser_pciefd_setup_board(struct kvaser_pciefd * pcie)1149 static int kvaser_pciefd_setup_board(struct kvaser_pciefd *pcie)
1150 {
1151 u32 version, srb_status, build;
1152
1153 version = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_VERSION_REG);
1154 pcie->nr_channels = min(KVASER_PCIEFD_MAX_CAN_CHANNELS,
1155 FIELD_GET(KVASER_PCIEFD_SYSID_VERSION_NR_CHAN_MASK, version));
1156
1157 build = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_BUILD_REG);
1158 dev_dbg(&pcie->pci->dev, "Version %lu.%lu.%lu\n",
1159 FIELD_GET(KVASER_PCIEFD_SYSID_VERSION_MAJOR_MASK, version),
1160 FIELD_GET(KVASER_PCIEFD_SYSID_VERSION_MINOR_MASK, version),
1161 FIELD_GET(KVASER_PCIEFD_SYSID_BUILD_SEQ_MASK, build));
1162
1163 srb_status = ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_STAT_REG);
1164 if (!(srb_status & KVASER_PCIEFD_SRB_STAT_DMA)) {
1165 dev_err(&pcie->pci->dev, "Hardware without DMA is not supported\n");
1166 return -ENODEV;
1167 }
1168
1169 pcie->bus_freq = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_BUSFREQ_REG);
1170 pcie->freq = ioread32(KVASER_PCIEFD_SYSID_ADDR(pcie) + KVASER_PCIEFD_SYSID_CANFREQ_REG);
1171 pcie->freq_to_ticks_div = pcie->freq / 1000000;
1172 if (pcie->freq_to_ticks_div == 0)
1173 pcie->freq_to_ticks_div = 1;
1174 /* Turn off all loopback functionality */
1175 iowrite32(0, KVASER_PCIEFD_LOOPBACK_ADDR(pcie));
1176
1177 return 0;
1178 }
1179
kvaser_pciefd_handle_data_packet(struct kvaser_pciefd * pcie,struct kvaser_pciefd_rx_packet * p,__le32 * data)1180 static int kvaser_pciefd_handle_data_packet(struct kvaser_pciefd *pcie,
1181 struct kvaser_pciefd_rx_packet *p,
1182 __le32 *data)
1183 {
1184 struct sk_buff *skb;
1185 struct canfd_frame *cf;
1186 struct can_priv *priv;
1187 u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1188 u8 dlc;
1189
1190 if (ch_id >= pcie->nr_channels)
1191 return -EIO;
1192
1193 priv = &pcie->can[ch_id]->can;
1194 dlc = FIELD_GET(KVASER_PCIEFD_RPACKET_DLC_MASK, p->header[1]);
1195
1196 if (p->header[1] & KVASER_PCIEFD_RPACKET_FDF) {
1197 skb = alloc_canfd_skb(priv->dev, &cf);
1198 if (!skb) {
1199 priv->dev->stats.rx_dropped++;
1200 return -ENOMEM;
1201 }
1202
1203 cf->len = can_fd_dlc2len(dlc);
1204 if (p->header[1] & KVASER_PCIEFD_RPACKET_BRS)
1205 cf->flags |= CANFD_BRS;
1206 if (p->header[1] & KVASER_PCIEFD_RPACKET_ESI)
1207 cf->flags |= CANFD_ESI;
1208 } else {
1209 skb = alloc_can_skb(priv->dev, (struct can_frame **)&cf);
1210 if (!skb) {
1211 priv->dev->stats.rx_dropped++;
1212 return -ENOMEM;
1213 }
1214 can_frame_set_cc_len((struct can_frame *)cf, dlc, priv->ctrlmode);
1215 }
1216
1217 cf->can_id = FIELD_GET(KVASER_PCIEFD_RPACKET_ID_MASK, p->header[0]);
1218 if (p->header[0] & KVASER_PCIEFD_RPACKET_IDE)
1219 cf->can_id |= CAN_EFF_FLAG;
1220
1221 if (p->header[0] & KVASER_PCIEFD_RPACKET_RTR) {
1222 cf->can_id |= CAN_RTR_FLAG;
1223 } else {
1224 memcpy(cf->data, data, cf->len);
1225 priv->dev->stats.rx_bytes += cf->len;
1226 }
1227 priv->dev->stats.rx_packets++;
1228 kvaser_pciefd_set_skb_timestamp(pcie, skb, p->timestamp);
1229
1230 return netif_rx(skb);
1231 }
1232
kvaser_pciefd_change_state(struct kvaser_pciefd_can * can,struct can_frame * cf,enum can_state new_state,enum can_state tx_state,enum can_state rx_state)1233 static void kvaser_pciefd_change_state(struct kvaser_pciefd_can *can,
1234 struct can_frame *cf,
1235 enum can_state new_state,
1236 enum can_state tx_state,
1237 enum can_state rx_state)
1238 {
1239 can_change_state(can->can.dev, cf, tx_state, rx_state);
1240
1241 if (new_state == CAN_STATE_BUS_OFF) {
1242 struct net_device *ndev = can->can.dev;
1243 unsigned long irq_flags;
1244
1245 spin_lock_irqsave(&can->lock, irq_flags);
1246 netif_stop_queue(can->can.dev);
1247 spin_unlock_irqrestore(&can->lock, irq_flags);
1248 /* Prevent CAN controller from auto recover from bus off */
1249 if (!can->can.restart_ms) {
1250 kvaser_pciefd_start_controller_flush(can);
1251 can_bus_off(ndev);
1252 }
1253 }
1254 }
1255
kvaser_pciefd_packet_to_state(struct kvaser_pciefd_rx_packet * p,struct can_berr_counter * bec,enum can_state * new_state,enum can_state * tx_state,enum can_state * rx_state)1256 static void kvaser_pciefd_packet_to_state(struct kvaser_pciefd_rx_packet *p,
1257 struct can_berr_counter *bec,
1258 enum can_state *new_state,
1259 enum can_state *tx_state,
1260 enum can_state *rx_state)
1261 {
1262 if (p->header[0] & KVASER_PCIEFD_SPACK_BOFF ||
1263 p->header[0] & KVASER_PCIEFD_SPACK_IRM)
1264 *new_state = CAN_STATE_BUS_OFF;
1265 else if (bec->txerr >= 255 || bec->rxerr >= 255)
1266 *new_state = CAN_STATE_BUS_OFF;
1267 else if (p->header[1] & KVASER_PCIEFD_SPACK_EPLR)
1268 *new_state = CAN_STATE_ERROR_PASSIVE;
1269 else if (bec->txerr >= 128 || bec->rxerr >= 128)
1270 *new_state = CAN_STATE_ERROR_PASSIVE;
1271 else if (p->header[1] & KVASER_PCIEFD_SPACK_EWLR)
1272 *new_state = CAN_STATE_ERROR_WARNING;
1273 else if (bec->txerr >= 96 || bec->rxerr >= 96)
1274 *new_state = CAN_STATE_ERROR_WARNING;
1275 else
1276 *new_state = CAN_STATE_ERROR_ACTIVE;
1277
1278 *tx_state = bec->txerr >= bec->rxerr ? *new_state : 0;
1279 *rx_state = bec->txerr <= bec->rxerr ? *new_state : 0;
1280 }
1281
kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can * can,struct kvaser_pciefd_rx_packet * p)1282 static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
1283 struct kvaser_pciefd_rx_packet *p)
1284 {
1285 struct can_berr_counter bec;
1286 enum can_state old_state, new_state, tx_state, rx_state;
1287 struct net_device *ndev = can->can.dev;
1288 struct sk_buff *skb;
1289 struct can_frame *cf = NULL;
1290
1291 old_state = can->can.state;
1292
1293 bec.txerr = FIELD_GET(KVASER_PCIEFD_SPACK_TXERR_MASK, p->header[0]);
1294 bec.rxerr = FIELD_GET(KVASER_PCIEFD_SPACK_RXERR_MASK, p->header[0]);
1295
1296 kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state, &rx_state);
1297 skb = alloc_can_err_skb(ndev, &cf);
1298 if (new_state != old_state) {
1299 kvaser_pciefd_change_state(can, cf, new_state, tx_state, rx_state);
1300 if (old_state == CAN_STATE_BUS_OFF &&
1301 new_state == CAN_STATE_ERROR_ACTIVE &&
1302 can->can.restart_ms) {
1303 can->can.can_stats.restarts++;
1304 if (skb)
1305 cf->can_id |= CAN_ERR_RESTARTED;
1306 }
1307 }
1308
1309 can->err_rep_cnt++;
1310 can->can.can_stats.bus_error++;
1311 if (p->header[1] & KVASER_PCIEFD_EPACK_DIR_TX)
1312 ndev->stats.tx_errors++;
1313 else
1314 ndev->stats.rx_errors++;
1315
1316 can->bec.txerr = bec.txerr;
1317 can->bec.rxerr = bec.rxerr;
1318
1319 if (!skb) {
1320 ndev->stats.rx_dropped++;
1321 return -ENOMEM;
1322 }
1323
1324 kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
1325 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
1326 cf->data[6] = bec.txerr;
1327 cf->data[7] = bec.rxerr;
1328
1329 netif_rx(skb);
1330
1331 return 0;
1332 }
1333
kvaser_pciefd_handle_error_packet(struct kvaser_pciefd * pcie,struct kvaser_pciefd_rx_packet * p)1334 static int kvaser_pciefd_handle_error_packet(struct kvaser_pciefd *pcie,
1335 struct kvaser_pciefd_rx_packet *p)
1336 {
1337 struct kvaser_pciefd_can *can;
1338 u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1339
1340 if (ch_id >= pcie->nr_channels)
1341 return -EIO;
1342
1343 can = pcie->can[ch_id];
1344 kvaser_pciefd_rx_error_frame(can, p);
1345 if (can->err_rep_cnt >= KVASER_PCIEFD_MAX_ERR_REP)
1346 /* Do not report more errors, until bec_poll_timer expires */
1347 kvaser_pciefd_disable_err_gen(can);
1348 /* Start polling the error counters */
1349 mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
1350
1351 return 0;
1352 }
1353
kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can * can,struct kvaser_pciefd_rx_packet * p)1354 static int kvaser_pciefd_handle_status_resp(struct kvaser_pciefd_can *can,
1355 struct kvaser_pciefd_rx_packet *p)
1356 {
1357 struct can_berr_counter bec;
1358 enum can_state old_state, new_state, tx_state, rx_state;
1359
1360 old_state = can->can.state;
1361
1362 bec.txerr = FIELD_GET(KVASER_PCIEFD_SPACK_TXERR_MASK, p->header[0]);
1363 bec.rxerr = FIELD_GET(KVASER_PCIEFD_SPACK_RXERR_MASK, p->header[0]);
1364
1365 kvaser_pciefd_packet_to_state(p, &bec, &new_state, &tx_state, &rx_state);
1366 if (new_state != old_state) {
1367 struct net_device *ndev = can->can.dev;
1368 struct sk_buff *skb;
1369 struct can_frame *cf;
1370
1371 skb = alloc_can_err_skb(ndev, &cf);
1372 if (!skb) {
1373 ndev->stats.rx_dropped++;
1374 return -ENOMEM;
1375 }
1376
1377 kvaser_pciefd_change_state(can, cf, new_state, tx_state, rx_state);
1378 if (old_state == CAN_STATE_BUS_OFF &&
1379 new_state == CAN_STATE_ERROR_ACTIVE &&
1380 can->can.restart_ms) {
1381 can->can.can_stats.restarts++;
1382 cf->can_id |= CAN_ERR_RESTARTED;
1383 }
1384
1385 kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
1386
1387 cf->data[6] = bec.txerr;
1388 cf->data[7] = bec.rxerr;
1389
1390 netif_rx(skb);
1391 }
1392 can->bec.txerr = bec.txerr;
1393 can->bec.rxerr = bec.rxerr;
1394 /* Check if we need to poll the error counters */
1395 if (bec.txerr || bec.rxerr)
1396 mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
1397
1398 return 0;
1399 }
1400
kvaser_pciefd_handle_status_packet(struct kvaser_pciefd * pcie,struct kvaser_pciefd_rx_packet * p)1401 static int kvaser_pciefd_handle_status_packet(struct kvaser_pciefd *pcie,
1402 struct kvaser_pciefd_rx_packet *p)
1403 {
1404 struct kvaser_pciefd_can *can;
1405 u8 cmdseq;
1406 u32 status;
1407 u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1408
1409 if (ch_id >= pcie->nr_channels)
1410 return -EIO;
1411
1412 can = pcie->can[ch_id];
1413
1414 status = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_STAT_REG);
1415 cmdseq = FIELD_GET(KVASER_PCIEFD_KCAN_STAT_SEQNO_MASK, status);
1416
1417 /* Reset done, start abort and flush */
1418 if (p->header[0] & KVASER_PCIEFD_SPACK_IRM &&
1419 p->header[0] & KVASER_PCIEFD_SPACK_RMCD &&
1420 p->header[1] & KVASER_PCIEFD_SPACK_AUTO &&
1421 cmdseq == FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[1]) &&
1422 status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
1423 iowrite32(KVASER_PCIEFD_KCAN_IRQ_ABD,
1424 can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1425 kvaser_pciefd_abort_flush_reset(can);
1426 } else if (p->header[0] & KVASER_PCIEFD_SPACK_IDET &&
1427 p->header[0] & KVASER_PCIEFD_SPACK_IRM &&
1428 cmdseq == FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[1]) &&
1429 status & KVASER_PCIEFD_KCAN_STAT_IDLE) {
1430 /* Reset detected, send end of flush if no packet are in FIFO */
1431 u8 count;
1432
1433 count = FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK,
1434 ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
1435 if (!count)
1436 iowrite32(FIELD_PREP(KVASER_PCIEFD_KCAN_CTRL_TYPE_MASK,
1437 KVASER_PCIEFD_KCAN_CTRL_TYPE_EFLUSH),
1438 can->reg_base + KVASER_PCIEFD_KCAN_CTRL_REG);
1439 } else if (!(p->header[1] & KVASER_PCIEFD_SPACK_AUTO) &&
1440 cmdseq == FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[1])) {
1441 /* Response to status request received */
1442 kvaser_pciefd_handle_status_resp(can, p);
1443 if (can->can.state != CAN_STATE_BUS_OFF &&
1444 can->can.state != CAN_STATE_ERROR_ACTIVE) {
1445 mod_timer(&can->bec_poll_timer, KVASER_PCIEFD_BEC_POLL_FREQ);
1446 }
1447 } else if (p->header[0] & KVASER_PCIEFD_SPACK_RMCD &&
1448 !(status & KVASER_PCIEFD_KCAN_STAT_BUS_OFF_MASK)) {
1449 /* Reset to bus on detected */
1450 if (!completion_done(&can->start_comp))
1451 complete(&can->start_comp);
1452 }
1453
1454 return 0;
1455 }
1456
kvaser_pciefd_handle_nack_packet(struct kvaser_pciefd_can * can,struct kvaser_pciefd_rx_packet * p)1457 static void kvaser_pciefd_handle_nack_packet(struct kvaser_pciefd_can *can,
1458 struct kvaser_pciefd_rx_packet *p)
1459 {
1460 struct sk_buff *skb;
1461 struct can_frame *cf;
1462
1463 skb = alloc_can_err_skb(can->can.dev, &cf);
1464 can->can.dev->stats.tx_errors++;
1465 if (p->header[0] & KVASER_PCIEFD_APACKET_ABL) {
1466 if (skb)
1467 cf->can_id |= CAN_ERR_LOSTARB;
1468 can->can.can_stats.arbitration_lost++;
1469 } else if (skb) {
1470 cf->can_id |= CAN_ERR_ACK;
1471 }
1472
1473 if (skb) {
1474 cf->can_id |= CAN_ERR_BUSERROR;
1475 kvaser_pciefd_set_skb_timestamp(can->kv_pcie, skb, p->timestamp);
1476 netif_rx(skb);
1477 } else {
1478 can->can.dev->stats.rx_dropped++;
1479 netdev_warn(can->can.dev, "No memory left for err_skb\n");
1480 }
1481 }
1482
kvaser_pciefd_handle_ack_packet(struct kvaser_pciefd * pcie,struct kvaser_pciefd_rx_packet * p)1483 static int kvaser_pciefd_handle_ack_packet(struct kvaser_pciefd *pcie,
1484 struct kvaser_pciefd_rx_packet *p)
1485 {
1486 struct kvaser_pciefd_can *can;
1487 bool one_shot_fail = false;
1488 u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1489
1490 if (ch_id >= pcie->nr_channels)
1491 return -EIO;
1492
1493 can = pcie->can[ch_id];
1494 /* Ignore control packet ACK */
1495 if (p->header[0] & KVASER_PCIEFD_APACKET_CT)
1496 return 0;
1497
1498 if (p->header[0] & KVASER_PCIEFD_APACKET_NACK) {
1499 kvaser_pciefd_handle_nack_packet(can, p);
1500 one_shot_fail = true;
1501 }
1502
1503 if (p->header[0] & KVASER_PCIEFD_APACKET_FLU) {
1504 netdev_dbg(can->can.dev, "Packet was flushed\n");
1505 } else {
1506 int echo_idx = FIELD_GET(KVASER_PCIEFD_PACKET_SEQ_MASK, p->header[0]);
1507 int len;
1508 u8 count;
1509 struct sk_buff *skb;
1510
1511 skb = can->can.echo_skb[echo_idx];
1512 if (skb)
1513 kvaser_pciefd_set_skb_timestamp(pcie, skb, p->timestamp);
1514 len = can_get_echo_skb(can->can.dev, echo_idx, NULL);
1515 count = FIELD_GET(KVASER_PCIEFD_KCAN_TX_NR_PACKETS_CURRENT_MASK,
1516 ioread32(can->reg_base + KVASER_PCIEFD_KCAN_TX_NR_PACKETS_REG));
1517
1518 if (count < can->can.echo_skb_max && netif_queue_stopped(can->can.dev))
1519 netif_wake_queue(can->can.dev);
1520
1521 if (!one_shot_fail) {
1522 can->can.dev->stats.tx_bytes += len;
1523 can->can.dev->stats.tx_packets++;
1524 }
1525 }
1526
1527 return 0;
1528 }
1529
kvaser_pciefd_handle_eflush_packet(struct kvaser_pciefd * pcie,struct kvaser_pciefd_rx_packet * p)1530 static int kvaser_pciefd_handle_eflush_packet(struct kvaser_pciefd *pcie,
1531 struct kvaser_pciefd_rx_packet *p)
1532 {
1533 struct kvaser_pciefd_can *can;
1534 u8 ch_id = FIELD_GET(KVASER_PCIEFD_PACKET_CHID_MASK, p->header[1]);
1535
1536 if (ch_id >= pcie->nr_channels)
1537 return -EIO;
1538
1539 can = pcie->can[ch_id];
1540
1541 if (!completion_done(&can->flush_comp))
1542 complete(&can->flush_comp);
1543
1544 return 0;
1545 }
1546
kvaser_pciefd_read_packet(struct kvaser_pciefd * pcie,int * start_pos,int dma_buf)1547 static int kvaser_pciefd_read_packet(struct kvaser_pciefd *pcie, int *start_pos,
1548 int dma_buf)
1549 {
1550 __le32 *buffer = pcie->dma_data[dma_buf];
1551 __le64 timestamp;
1552 struct kvaser_pciefd_rx_packet packet;
1553 struct kvaser_pciefd_rx_packet *p = &packet;
1554 u8 type;
1555 int pos = *start_pos;
1556 int size;
1557 int ret = 0;
1558
1559 size = le32_to_cpu(buffer[pos++]);
1560 if (!size) {
1561 *start_pos = 0;
1562 return 0;
1563 }
1564
1565 p->header[0] = le32_to_cpu(buffer[pos++]);
1566 p->header[1] = le32_to_cpu(buffer[pos++]);
1567
1568 /* Read 64-bit timestamp */
1569 memcpy(×tamp, &buffer[pos], sizeof(__le64));
1570 pos += 2;
1571 p->timestamp = le64_to_cpu(timestamp);
1572
1573 type = FIELD_GET(KVASER_PCIEFD_PACKET_TYPE_MASK, p->header[1]);
1574 switch (type) {
1575 case KVASER_PCIEFD_PACK_TYPE_DATA:
1576 ret = kvaser_pciefd_handle_data_packet(pcie, p, &buffer[pos]);
1577 if (!(p->header[0] & KVASER_PCIEFD_RPACKET_RTR)) {
1578 u8 data_len;
1579
1580 data_len = can_fd_dlc2len(FIELD_GET(KVASER_PCIEFD_RPACKET_DLC_MASK,
1581 p->header[1]));
1582 pos += DIV_ROUND_UP(data_len, 4);
1583 }
1584 break;
1585
1586 case KVASER_PCIEFD_PACK_TYPE_ACK:
1587 ret = kvaser_pciefd_handle_ack_packet(pcie, p);
1588 break;
1589
1590 case KVASER_PCIEFD_PACK_TYPE_STATUS:
1591 ret = kvaser_pciefd_handle_status_packet(pcie, p);
1592 break;
1593
1594 case KVASER_PCIEFD_PACK_TYPE_ERROR:
1595 ret = kvaser_pciefd_handle_error_packet(pcie, p);
1596 break;
1597
1598 case KVASER_PCIEFD_PACK_TYPE_EFLUSH_ACK:
1599 ret = kvaser_pciefd_handle_eflush_packet(pcie, p);
1600 break;
1601
1602 case KVASER_PCIEFD_PACK_TYPE_ACK_DATA:
1603 case KVASER_PCIEFD_PACK_TYPE_BUS_LOAD:
1604 case KVASER_PCIEFD_PACK_TYPE_EFRAME_ACK:
1605 case KVASER_PCIEFD_PACK_TYPE_TXRQ:
1606 dev_info(&pcie->pci->dev,
1607 "Received unexpected packet type 0x%08X\n", type);
1608 break;
1609
1610 default:
1611 dev_err(&pcie->pci->dev, "Unknown packet type 0x%08X\n", type);
1612 ret = -EIO;
1613 break;
1614 }
1615
1616 if (ret)
1617 return ret;
1618
1619 /* Position does not point to the end of the package,
1620 * corrupted packet size?
1621 */
1622 if ((*start_pos + size) != pos)
1623 return -EIO;
1624
1625 /* Point to the next packet header, if any */
1626 *start_pos = pos;
1627
1628 return ret;
1629 }
1630
kvaser_pciefd_read_buffer(struct kvaser_pciefd * pcie,int dma_buf)1631 static int kvaser_pciefd_read_buffer(struct kvaser_pciefd *pcie, int dma_buf)
1632 {
1633 int pos = 0;
1634 int res = 0;
1635
1636 do {
1637 res = kvaser_pciefd_read_packet(pcie, &pos, dma_buf);
1638 } while (!res && pos > 0 && pos < KVASER_PCIEFD_DMA_SIZE);
1639
1640 return res;
1641 }
1642
kvaser_pciefd_receive_irq(struct kvaser_pciefd * pcie)1643 static void kvaser_pciefd_receive_irq(struct kvaser_pciefd *pcie)
1644 {
1645 u32 irq = ioread32(KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IRQ_REG);
1646
1647 if (irq & KVASER_PCIEFD_SRB_IRQ_DPD0) {
1648 kvaser_pciefd_read_buffer(pcie, 0);
1649 /* Reset DMA buffer 0 */
1650 iowrite32(KVASER_PCIEFD_SRB_CMD_RDB0,
1651 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1652 }
1653
1654 if (irq & KVASER_PCIEFD_SRB_IRQ_DPD1) {
1655 kvaser_pciefd_read_buffer(pcie, 1);
1656 /* Reset DMA buffer 1 */
1657 iowrite32(KVASER_PCIEFD_SRB_CMD_RDB1,
1658 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1659 }
1660
1661 if (irq & KVASER_PCIEFD_SRB_IRQ_DOF0 ||
1662 irq & KVASER_PCIEFD_SRB_IRQ_DOF1 ||
1663 irq & KVASER_PCIEFD_SRB_IRQ_DUF0 ||
1664 irq & KVASER_PCIEFD_SRB_IRQ_DUF1)
1665 dev_err(&pcie->pci->dev, "DMA IRQ error 0x%08X\n", irq);
1666
1667 iowrite32(irq, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IRQ_REG);
1668 }
1669
kvaser_pciefd_transmit_irq(struct kvaser_pciefd_can * can)1670 static void kvaser_pciefd_transmit_irq(struct kvaser_pciefd_can *can)
1671 {
1672 u32 irq = ioread32(can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1673
1674 if (irq & KVASER_PCIEFD_KCAN_IRQ_TOF)
1675 netdev_err(can->can.dev, "Tx FIFO overflow\n");
1676
1677 if (irq & KVASER_PCIEFD_KCAN_IRQ_BPP)
1678 netdev_err(can->can.dev,
1679 "Fail to change bittiming, when not in reset mode\n");
1680
1681 if (irq & KVASER_PCIEFD_KCAN_IRQ_FDIC)
1682 netdev_err(can->can.dev, "CAN FD frame in CAN mode\n");
1683
1684 if (irq & KVASER_PCIEFD_KCAN_IRQ_ROF)
1685 netdev_err(can->can.dev, "Rx FIFO overflow\n");
1686
1687 iowrite32(irq, can->reg_base + KVASER_PCIEFD_KCAN_IRQ_REG);
1688 }
1689
kvaser_pciefd_irq_handler(int irq,void * dev)1690 static irqreturn_t kvaser_pciefd_irq_handler(int irq, void *dev)
1691 {
1692 struct kvaser_pciefd *pcie = (struct kvaser_pciefd *)dev;
1693 const struct kvaser_pciefd_irq_mask *irq_mask = pcie->driver_data->irq_mask;
1694 u32 board_irq = ioread32(KVASER_PCIEFD_PCI_IRQ_ADDR(pcie));
1695 int i;
1696
1697 if (!(board_irq & irq_mask->all))
1698 return IRQ_NONE;
1699
1700 if (board_irq & irq_mask->kcan_rx0)
1701 kvaser_pciefd_receive_irq(pcie);
1702
1703 for (i = 0; i < pcie->nr_channels; i++) {
1704 if (!pcie->can[i]) {
1705 dev_err(&pcie->pci->dev,
1706 "IRQ mask points to unallocated controller\n");
1707 break;
1708 }
1709
1710 /* Check that mask matches channel (i) IRQ mask */
1711 if (board_irq & irq_mask->kcan_tx[i])
1712 kvaser_pciefd_transmit_irq(pcie->can[i]);
1713 }
1714
1715 return IRQ_HANDLED;
1716 }
1717
kvaser_pciefd_teardown_can_ctrls(struct kvaser_pciefd * pcie)1718 static void kvaser_pciefd_teardown_can_ctrls(struct kvaser_pciefd *pcie)
1719 {
1720 int i;
1721
1722 for (i = 0; i < pcie->nr_channels; i++) {
1723 struct kvaser_pciefd_can *can = pcie->can[i];
1724
1725 if (can) {
1726 iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
1727 kvaser_pciefd_pwm_stop(can);
1728 free_candev(can->can.dev);
1729 }
1730 }
1731 }
1732
kvaser_pciefd_probe(struct pci_dev * pdev,const struct pci_device_id * id)1733 static int kvaser_pciefd_probe(struct pci_dev *pdev,
1734 const struct pci_device_id *id)
1735 {
1736 int err;
1737 struct kvaser_pciefd *pcie;
1738 const struct kvaser_pciefd_irq_mask *irq_mask;
1739 void __iomem *irq_en_base;
1740
1741 pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
1742 if (!pcie)
1743 return -ENOMEM;
1744
1745 pci_set_drvdata(pdev, pcie);
1746 pcie->pci = pdev;
1747 pcie->driver_data = (const struct kvaser_pciefd_driver_data *)id->driver_data;
1748 irq_mask = pcie->driver_data->irq_mask;
1749
1750 err = pci_enable_device(pdev);
1751 if (err)
1752 return err;
1753
1754 err = pci_request_regions(pdev, KVASER_PCIEFD_DRV_NAME);
1755 if (err)
1756 goto err_disable_pci;
1757
1758 pcie->reg_base = pci_iomap(pdev, 0, 0);
1759 if (!pcie->reg_base) {
1760 err = -ENOMEM;
1761 goto err_release_regions;
1762 }
1763
1764 err = kvaser_pciefd_setup_board(pcie);
1765 if (err)
1766 goto err_pci_iounmap;
1767
1768 err = kvaser_pciefd_setup_dma(pcie);
1769 if (err)
1770 goto err_pci_iounmap;
1771
1772 pci_set_master(pdev);
1773
1774 err = kvaser_pciefd_setup_can_ctrls(pcie);
1775 if (err)
1776 goto err_teardown_can_ctrls;
1777
1778 err = request_irq(pcie->pci->irq, kvaser_pciefd_irq_handler,
1779 IRQF_SHARED, KVASER_PCIEFD_DRV_NAME, pcie);
1780 if (err)
1781 goto err_teardown_can_ctrls;
1782
1783 iowrite32(KVASER_PCIEFD_SRB_IRQ_DPD0 | KVASER_PCIEFD_SRB_IRQ_DPD1,
1784 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IRQ_REG);
1785
1786 iowrite32(KVASER_PCIEFD_SRB_IRQ_DPD0 | KVASER_PCIEFD_SRB_IRQ_DPD1 |
1787 KVASER_PCIEFD_SRB_IRQ_DOF0 | KVASER_PCIEFD_SRB_IRQ_DOF1 |
1788 KVASER_PCIEFD_SRB_IRQ_DUF0 | KVASER_PCIEFD_SRB_IRQ_DUF1,
1789 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_IEN_REG);
1790
1791 /* Enable PCI interrupts */
1792 irq_en_base = KVASER_PCIEFD_PCI_IEN_ADDR(pcie);
1793 iowrite32(irq_mask->all, irq_en_base);
1794 /* Ready the DMA buffers */
1795 iowrite32(KVASER_PCIEFD_SRB_CMD_RDB0,
1796 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1797 iowrite32(KVASER_PCIEFD_SRB_CMD_RDB1,
1798 KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CMD_REG);
1799
1800 err = kvaser_pciefd_reg_candev(pcie);
1801 if (err)
1802 goto err_free_irq;
1803
1804 return 0;
1805
1806 err_free_irq:
1807 /* Disable PCI interrupts */
1808 iowrite32(0, irq_en_base);
1809 free_irq(pcie->pci->irq, pcie);
1810
1811 err_teardown_can_ctrls:
1812 kvaser_pciefd_teardown_can_ctrls(pcie);
1813 iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1814 pci_clear_master(pdev);
1815
1816 err_pci_iounmap:
1817 pci_iounmap(pdev, pcie->reg_base);
1818
1819 err_release_regions:
1820 pci_release_regions(pdev);
1821
1822 err_disable_pci:
1823 pci_disable_device(pdev);
1824
1825 return err;
1826 }
1827
kvaser_pciefd_remove_all_ctrls(struct kvaser_pciefd * pcie)1828 static void kvaser_pciefd_remove_all_ctrls(struct kvaser_pciefd *pcie)
1829 {
1830 int i;
1831
1832 for (i = 0; i < pcie->nr_channels; i++) {
1833 struct kvaser_pciefd_can *can = pcie->can[i];
1834
1835 if (can) {
1836 iowrite32(0, can->reg_base + KVASER_PCIEFD_KCAN_IEN_REG);
1837 unregister_candev(can->can.dev);
1838 del_timer(&can->bec_poll_timer);
1839 kvaser_pciefd_pwm_stop(can);
1840 free_candev(can->can.dev);
1841 }
1842 }
1843 }
1844
kvaser_pciefd_remove(struct pci_dev * pdev)1845 static void kvaser_pciefd_remove(struct pci_dev *pdev)
1846 {
1847 struct kvaser_pciefd *pcie = pci_get_drvdata(pdev);
1848
1849 kvaser_pciefd_remove_all_ctrls(pcie);
1850
1851 /* Disable interrupts */
1852 iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
1853 iowrite32(0, KVASER_PCIEFD_PCI_IEN_ADDR(pcie));
1854
1855 free_irq(pcie->pci->irq, pcie);
1856
1857 pci_iounmap(pdev, pcie->reg_base);
1858 pci_release_regions(pdev);
1859 pci_disable_device(pdev);
1860 }
1861
1862 static struct pci_driver kvaser_pciefd = {
1863 .name = KVASER_PCIEFD_DRV_NAME,
1864 .id_table = kvaser_pciefd_id_table,
1865 .probe = kvaser_pciefd_probe,
1866 .remove = kvaser_pciefd_remove,
1867 };
1868
1869 module_pci_driver(kvaser_pciefd)
1870