xref: /openbmc/linux/drivers/net/can/kvaser_pciefd.c (revision 503901d3)
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(&timestamp, &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