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