2 * flexcan.c - FLEXCAN CAN controller driver
4 * Copyright (c) 2005-2006 Varma Electronics Oy
5 * Copyright (c) 2009 Sascha Hauer, Pengutronix
6 * Copyright (c) 2010-2017 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
7 * Copyright (c) 2014 David Jander, Protonic Holland
9 * Based on code originally by Andrey Volkov <avolkov@varma-el.com>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation version 2.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
23 #include <linux/netdevice.h>
24 #include <linux/can.h>
25 #include <linux/can/dev.h>
26 #include <linux/can/error.h>
27 #include <linux/can/led.h>
28 #include <linux/can/rx-offload.h>
29 #include <linux/clk.h>
30 #include <linux/delay.h>
31 #include <linux/interrupt.h>
33 #include <linux/module.h>
35 #include <linux/of_device.h>
36 #include <linux/platform_device.h>
37 #include <linux/regulator/consumer.h>
39 #define DRV_NAME "flexcan"
41 /* 8 for RX fifo and 2 error handling */
42 #define FLEXCAN_NAPI_WEIGHT (8 + 2)
44 /* FLEXCAN module configuration register (CANMCR) bits */
45 #define FLEXCAN_MCR_MDIS BIT(31)
46 #define FLEXCAN_MCR_FRZ BIT(30)
47 #define FLEXCAN_MCR_FEN BIT(29)
48 #define FLEXCAN_MCR_HALT BIT(28)
49 #define FLEXCAN_MCR_NOT_RDY BIT(27)
50 #define FLEXCAN_MCR_WAK_MSK BIT(26)
51 #define FLEXCAN_MCR_SOFTRST BIT(25)
52 #define FLEXCAN_MCR_FRZ_ACK BIT(24)
53 #define FLEXCAN_MCR_SUPV BIT(23)
54 #define FLEXCAN_MCR_SLF_WAK BIT(22)
55 #define FLEXCAN_MCR_WRN_EN BIT(21)
56 #define FLEXCAN_MCR_LPM_ACK BIT(20)
57 #define FLEXCAN_MCR_WAK_SRC BIT(19)
58 #define FLEXCAN_MCR_DOZE BIT(18)
59 #define FLEXCAN_MCR_SRX_DIS BIT(17)
60 #define FLEXCAN_MCR_IRMQ BIT(16)
61 #define FLEXCAN_MCR_LPRIO_EN BIT(13)
62 #define FLEXCAN_MCR_AEN BIT(12)
63 /* MCR_MAXMB: maximum used MBs is MAXMB + 1 */
64 #define FLEXCAN_MCR_MAXMB(x) ((x) & 0x7f)
65 #define FLEXCAN_MCR_IDAM_A (0x0 << 8)
66 #define FLEXCAN_MCR_IDAM_B (0x1 << 8)
67 #define FLEXCAN_MCR_IDAM_C (0x2 << 8)
68 #define FLEXCAN_MCR_IDAM_D (0x3 << 8)
70 /* FLEXCAN control register (CANCTRL) bits */
71 #define FLEXCAN_CTRL_PRESDIV(x) (((x) & 0xff) << 24)
72 #define FLEXCAN_CTRL_RJW(x) (((x) & 0x03) << 22)
73 #define FLEXCAN_CTRL_PSEG1(x) (((x) & 0x07) << 19)
74 #define FLEXCAN_CTRL_PSEG2(x) (((x) & 0x07) << 16)
75 #define FLEXCAN_CTRL_BOFF_MSK BIT(15)
76 #define FLEXCAN_CTRL_ERR_MSK BIT(14)
77 #define FLEXCAN_CTRL_CLK_SRC BIT(13)
78 #define FLEXCAN_CTRL_LPB BIT(12)
79 #define FLEXCAN_CTRL_TWRN_MSK BIT(11)
80 #define FLEXCAN_CTRL_RWRN_MSK BIT(10)
81 #define FLEXCAN_CTRL_SMP BIT(7)
82 #define FLEXCAN_CTRL_BOFF_REC BIT(6)
83 #define FLEXCAN_CTRL_TSYN BIT(5)
84 #define FLEXCAN_CTRL_LBUF BIT(4)
85 #define FLEXCAN_CTRL_LOM BIT(3)
86 #define FLEXCAN_CTRL_PROPSEG(x) ((x) & 0x07)
87 #define FLEXCAN_CTRL_ERR_BUS (FLEXCAN_CTRL_ERR_MSK)
88 #define FLEXCAN_CTRL_ERR_STATE \
89 (FLEXCAN_CTRL_TWRN_MSK | FLEXCAN_CTRL_RWRN_MSK | \
90 FLEXCAN_CTRL_BOFF_MSK)
91 #define FLEXCAN_CTRL_ERR_ALL \
92 (FLEXCAN_CTRL_ERR_BUS | FLEXCAN_CTRL_ERR_STATE)
94 /* FLEXCAN control register 2 (CTRL2) bits */
95 #define FLEXCAN_CTRL2_ECRWRE BIT(29)
96 #define FLEXCAN_CTRL2_WRMFRZ BIT(28)
97 #define FLEXCAN_CTRL2_RFFN(x) (((x) & 0x0f) << 24)
98 #define FLEXCAN_CTRL2_TASD(x) (((x) & 0x1f) << 19)
99 #define FLEXCAN_CTRL2_MRP BIT(18)
100 #define FLEXCAN_CTRL2_RRS BIT(17)
101 #define FLEXCAN_CTRL2_EACEN BIT(16)
103 /* FLEXCAN memory error control register (MECR) bits */
104 #define FLEXCAN_MECR_ECRWRDIS BIT(31)
105 #define FLEXCAN_MECR_HANCEI_MSK BIT(19)
106 #define FLEXCAN_MECR_FANCEI_MSK BIT(18)
107 #define FLEXCAN_MECR_CEI_MSK BIT(16)
108 #define FLEXCAN_MECR_HAERRIE BIT(15)
109 #define FLEXCAN_MECR_FAERRIE BIT(14)
110 #define FLEXCAN_MECR_EXTERRIE BIT(13)
111 #define FLEXCAN_MECR_RERRDIS BIT(9)
112 #define FLEXCAN_MECR_ECCDIS BIT(8)
113 #define FLEXCAN_MECR_NCEFAFRZ BIT(7)
115 /* FLEXCAN error and status register (ESR) bits */
116 #define FLEXCAN_ESR_TWRN_INT BIT(17)
117 #define FLEXCAN_ESR_RWRN_INT BIT(16)
118 #define FLEXCAN_ESR_BIT1_ERR BIT(15)
119 #define FLEXCAN_ESR_BIT0_ERR BIT(14)
120 #define FLEXCAN_ESR_ACK_ERR BIT(13)
121 #define FLEXCAN_ESR_CRC_ERR BIT(12)
122 #define FLEXCAN_ESR_FRM_ERR BIT(11)
123 #define FLEXCAN_ESR_STF_ERR BIT(10)
124 #define FLEXCAN_ESR_TX_WRN BIT(9)
125 #define FLEXCAN_ESR_RX_WRN BIT(8)
126 #define FLEXCAN_ESR_IDLE BIT(7)
127 #define FLEXCAN_ESR_TXRX BIT(6)
128 #define FLEXCAN_EST_FLT_CONF_SHIFT (4)
129 #define FLEXCAN_ESR_FLT_CONF_MASK (0x3 << FLEXCAN_EST_FLT_CONF_SHIFT)
130 #define FLEXCAN_ESR_FLT_CONF_ACTIVE (0x0 << FLEXCAN_EST_FLT_CONF_SHIFT)
131 #define FLEXCAN_ESR_FLT_CONF_PASSIVE (0x1 << FLEXCAN_EST_FLT_CONF_SHIFT)
132 #define FLEXCAN_ESR_BOFF_INT BIT(2)
133 #define FLEXCAN_ESR_ERR_INT BIT(1)
134 #define FLEXCAN_ESR_WAK_INT BIT(0)
135 #define FLEXCAN_ESR_ERR_BUS \
136 (FLEXCAN_ESR_BIT1_ERR | FLEXCAN_ESR_BIT0_ERR | \
137 FLEXCAN_ESR_ACK_ERR | FLEXCAN_ESR_CRC_ERR | \
138 FLEXCAN_ESR_FRM_ERR | FLEXCAN_ESR_STF_ERR)
139 #define FLEXCAN_ESR_ERR_STATE \
140 (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | FLEXCAN_ESR_BOFF_INT)
141 #define FLEXCAN_ESR_ERR_ALL \
142 (FLEXCAN_ESR_ERR_BUS | FLEXCAN_ESR_ERR_STATE)
143 #define FLEXCAN_ESR_ALL_INT \
144 (FLEXCAN_ESR_TWRN_INT | FLEXCAN_ESR_RWRN_INT | \
145 FLEXCAN_ESR_BOFF_INT | FLEXCAN_ESR_ERR_INT)
147 /* FLEXCAN interrupt flag register (IFLAG) bits */
148 /* Errata ERR005829 step7: Reserve first valid MB */
149 #define FLEXCAN_TX_MB_RESERVED_OFF_FIFO 8
150 #define FLEXCAN_TX_MB_OFF_FIFO 9
151 #define FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP 0
152 #define FLEXCAN_TX_MB_OFF_TIMESTAMP 1
153 #define FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST (FLEXCAN_TX_MB_OFF_TIMESTAMP + 1)
154 #define FLEXCAN_RX_MB_OFF_TIMESTAMP_LAST 63
155 #define FLEXCAN_IFLAG_MB(x) BIT(x)
156 #define FLEXCAN_IFLAG_RX_FIFO_OVERFLOW BIT(7)
157 #define FLEXCAN_IFLAG_RX_FIFO_WARN BIT(6)
158 #define FLEXCAN_IFLAG_RX_FIFO_AVAILABLE BIT(5)
160 /* FLEXCAN message buffers */
161 #define FLEXCAN_MB_CODE_MASK (0xf << 24)
162 #define FLEXCAN_MB_CODE_RX_BUSY_BIT (0x1 << 24)
163 #define FLEXCAN_MB_CODE_RX_INACTIVE (0x0 << 24)
164 #define FLEXCAN_MB_CODE_RX_EMPTY (0x4 << 24)
165 #define FLEXCAN_MB_CODE_RX_FULL (0x2 << 24)
166 #define FLEXCAN_MB_CODE_RX_OVERRUN (0x6 << 24)
167 #define FLEXCAN_MB_CODE_RX_RANSWER (0xa << 24)
169 #define FLEXCAN_MB_CODE_TX_INACTIVE (0x8 << 24)
170 #define FLEXCAN_MB_CODE_TX_ABORT (0x9 << 24)
171 #define FLEXCAN_MB_CODE_TX_DATA (0xc << 24)
172 #define FLEXCAN_MB_CODE_TX_TANSWER (0xe << 24)
174 #define FLEXCAN_MB_CNT_SRR BIT(22)
175 #define FLEXCAN_MB_CNT_IDE BIT(21)
176 #define FLEXCAN_MB_CNT_RTR BIT(20)
177 #define FLEXCAN_MB_CNT_LENGTH(x) (((x) & 0xf) << 16)
178 #define FLEXCAN_MB_CNT_TIMESTAMP(x) ((x) & 0xffff)
180 #define FLEXCAN_TIMEOUT_US (50)
182 /* FLEXCAN hardware feature flags
184 * Below is some version info we got:
185 * SOC Version IP-Version Glitch- [TR]WRN_INT IRQ Err Memory err RTR re-
186 * Filter? connected? Passive detection ception in MB
187 * MX25 FlexCAN2 03.00.00.00 no no ? no no
188 * MX28 FlexCAN2 03.00.04.00 yes yes no no no
189 * MX35 FlexCAN2 03.00.00.00 no no ? no no
190 * MX53 FlexCAN2 03.00.00.00 yes no no no no
191 * MX6s FlexCAN3 10.00.12.00 yes yes no no yes
192 * VF610 FlexCAN3 ? no yes ? yes yes?
194 * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected.
196 #define FLEXCAN_QUIRK_BROKEN_WERR_STATE BIT(1) /* [TR]WRN_INT not connected */
197 #define FLEXCAN_QUIRK_DISABLE_RXFG BIT(2) /* Disable RX FIFO Global mask */
198 #define FLEXCAN_QUIRK_ENABLE_EACEN_RRS BIT(3) /* Enable EACEN and RRS bit in ctrl2 */
199 #define FLEXCAN_QUIRK_DISABLE_MECR BIT(4) /* Disable Memory error detection */
200 #define FLEXCAN_QUIRK_USE_OFF_TIMESTAMP BIT(5) /* Use timestamp based offloading */
201 #define FLEXCAN_QUIRK_BROKEN_PERR_STATE BIT(6) /* No interrupt for error passive */
203 /* Structure of the message buffer */
210 /* Structure of the hardware registers */
211 struct flexcan_regs {
214 u32 timer; /* 0x08 */
215 u32 _reserved1; /* 0x0c */
216 u32 rxgmask; /* 0x10 */
217 u32 rx14mask; /* 0x14 */
218 u32 rx15mask; /* 0x18 */
221 u32 imask2; /* 0x24 */
222 u32 imask1; /* 0x28 */
223 u32 iflag2; /* 0x2c */
224 u32 iflag1; /* 0x30 */
226 u32 gfwr_mx28; /* MX28, MX53 */
227 u32 ctrl2; /* MX6, VF610 */
230 u32 imeur; /* 0x3c */
233 u32 rxfgmask; /* 0x48 */
234 u32 rxfir; /* 0x4c */
235 u32 _reserved3[12]; /* 0x50 */
236 struct flexcan_mb mb[64]; /* 0x80 */
239 * 0x080...0x08f 0 RX message buffer
240 * 0x090...0x0df 1-5 reserverd
241 * 0x0e0...0x0ff 6-7 8 entry ID table
242 * (mx25, mx28, mx35, mx53)
243 * 0x0e0...0x2df 6-7..37 8..128 entry ID table
244 * size conf'ed via ctrl2::RFFN
247 u32 _reserved4[256]; /* 0x480 */
248 u32 rximr[64]; /* 0x880 */
249 u32 _reserved5[24]; /* 0x980 */
250 u32 gfwr_mx6; /* 0x9e0 - MX6 */
251 u32 _reserved6[63]; /* 0x9e4 */
252 u32 mecr; /* 0xae0 */
253 u32 erriar; /* 0xae4 */
254 u32 erridpr; /* 0xae8 */
255 u32 errippr; /* 0xaec */
256 u32 rerrar; /* 0xaf0 */
257 u32 rerrdr; /* 0xaf4 */
258 u32 rerrsynr; /* 0xaf8 */
259 u32 errsr; /* 0xafc */
262 struct flexcan_devtype_data {
263 u32 quirks; /* quirks needed for different IP cores */
266 struct flexcan_priv {
268 struct can_rx_offload offload;
270 struct flexcan_regs __iomem *regs;
271 struct flexcan_mb __iomem *tx_mb;
272 struct flexcan_mb __iomem *tx_mb_reserved;
274 u32 reg_ctrl_default;
275 u32 reg_imask1_default;
276 u32 reg_imask2_default;
280 const struct flexcan_devtype_data *devtype_data;
281 struct regulator *reg_xceiver;
284 static const struct flexcan_devtype_data fsl_p1010_devtype_data = {
285 .quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE,
288 static const struct flexcan_devtype_data fsl_imx28_devtype_data = {
289 .quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE,
292 static const struct flexcan_devtype_data fsl_imx6q_devtype_data = {
293 .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
294 FLEXCAN_QUIRK_USE_OFF_TIMESTAMP | FLEXCAN_QUIRK_BROKEN_PERR_STATE,
297 static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
298 .quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
299 FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP,
302 static const struct can_bittiming_const flexcan_bittiming_const = {
314 /* Abstract off the read/write for arm versus ppc. This
315 * assumes that PPC uses big-endian registers and everything
316 * else uses little-endian registers, independent of CPU
319 #if defined(CONFIG_PPC)
320 static inline u32 flexcan_read(void __iomem *addr)
322 return in_be32(addr);
325 static inline void flexcan_write(u32 val, void __iomem *addr)
330 static inline u32 flexcan_read(void __iomem *addr)
335 static inline void flexcan_write(u32 val, void __iomem *addr)
341 static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv)
343 struct flexcan_regs __iomem *regs = priv->regs;
344 u32 reg_ctrl = (priv->reg_ctrl_default | FLEXCAN_CTRL_ERR_MSK);
346 flexcan_write(reg_ctrl, ®s->ctrl);
349 static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv)
351 struct flexcan_regs __iomem *regs = priv->regs;
352 u32 reg_ctrl = (priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_MSK);
354 flexcan_write(reg_ctrl, ®s->ctrl);
357 static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)
359 if (!priv->reg_xceiver)
362 return regulator_enable(priv->reg_xceiver);
365 static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)
367 if (!priv->reg_xceiver)
370 return regulator_disable(priv->reg_xceiver);
373 static int flexcan_chip_enable(struct flexcan_priv *priv)
375 struct flexcan_regs __iomem *regs = priv->regs;
376 unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
379 reg = flexcan_read(®s->mcr);
380 reg &= ~FLEXCAN_MCR_MDIS;
381 flexcan_write(reg, ®s->mcr);
383 while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK))
386 if (flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK)
392 static int flexcan_chip_disable(struct flexcan_priv *priv)
394 struct flexcan_regs __iomem *regs = priv->regs;
395 unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
398 reg = flexcan_read(®s->mcr);
399 reg |= FLEXCAN_MCR_MDIS;
400 flexcan_write(reg, ®s->mcr);
402 while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK))
405 if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_LPM_ACK))
411 static int flexcan_chip_freeze(struct flexcan_priv *priv)
413 struct flexcan_regs __iomem *regs = priv->regs;
414 unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate;
417 reg = flexcan_read(®s->mcr);
418 reg |= FLEXCAN_MCR_HALT;
419 flexcan_write(reg, ®s->mcr);
421 while (timeout-- && !(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
424 if (!(flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
430 static int flexcan_chip_unfreeze(struct flexcan_priv *priv)
432 struct flexcan_regs __iomem *regs = priv->regs;
433 unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
436 reg = flexcan_read(®s->mcr);
437 reg &= ~FLEXCAN_MCR_HALT;
438 flexcan_write(reg, ®s->mcr);
440 while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK))
443 if (flexcan_read(®s->mcr) & FLEXCAN_MCR_FRZ_ACK)
449 static int flexcan_chip_softreset(struct flexcan_priv *priv)
451 struct flexcan_regs __iomem *regs = priv->regs;
452 unsigned int timeout = FLEXCAN_TIMEOUT_US / 10;
454 flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr);
455 while (timeout-- && (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST))
458 if (flexcan_read(®s->mcr) & FLEXCAN_MCR_SOFTRST)
464 static int __flexcan_get_berr_counter(const struct net_device *dev,
465 struct can_berr_counter *bec)
467 const struct flexcan_priv *priv = netdev_priv(dev);
468 struct flexcan_regs __iomem *regs = priv->regs;
469 u32 reg = flexcan_read(®s->ecr);
471 bec->txerr = (reg >> 0) & 0xff;
472 bec->rxerr = (reg >> 8) & 0xff;
477 static int flexcan_get_berr_counter(const struct net_device *dev,
478 struct can_berr_counter *bec)
480 const struct flexcan_priv *priv = netdev_priv(dev);
483 err = clk_prepare_enable(priv->clk_ipg);
487 err = clk_prepare_enable(priv->clk_per);
489 goto out_disable_ipg;
491 err = __flexcan_get_berr_counter(dev, bec);
493 clk_disable_unprepare(priv->clk_per);
495 clk_disable_unprepare(priv->clk_ipg);
500 static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
502 const struct flexcan_priv *priv = netdev_priv(dev);
503 struct can_frame *cf = (struct can_frame *)skb->data;
506 u32 ctrl = FLEXCAN_MB_CODE_TX_DATA | (cf->can_dlc << 16);
508 if (can_dropped_invalid_skb(dev, skb))
511 netif_stop_queue(dev);
513 if (cf->can_id & CAN_EFF_FLAG) {
514 can_id = cf->can_id & CAN_EFF_MASK;
515 ctrl |= FLEXCAN_MB_CNT_IDE | FLEXCAN_MB_CNT_SRR;
517 can_id = (cf->can_id & CAN_SFF_MASK) << 18;
520 if (cf->can_id & CAN_RTR_FLAG)
521 ctrl |= FLEXCAN_MB_CNT_RTR;
523 if (cf->can_dlc > 0) {
524 data = be32_to_cpup((__be32 *)&cf->data[0]);
525 flexcan_write(data, &priv->tx_mb->data[0]);
527 if (cf->can_dlc > 3) {
528 data = be32_to_cpup((__be32 *)&cf->data[4]);
529 flexcan_write(data, &priv->tx_mb->data[1]);
532 can_put_echo_skb(skb, dev, 0);
534 flexcan_write(can_id, &priv->tx_mb->can_id);
535 flexcan_write(ctrl, &priv->tx_mb->can_ctrl);
537 /* Errata ERR005829 step8:
538 * Write twice INACTIVE(0x8) code to first MB.
540 flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
541 &priv->tx_mb_reserved->can_ctrl);
542 flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
543 &priv->tx_mb_reserved->can_ctrl);
548 static void flexcan_irq_bus_err(struct net_device *dev, u32 reg_esr)
550 struct flexcan_priv *priv = netdev_priv(dev);
552 struct can_frame *cf;
553 bool rx_errors = false, tx_errors = false;
555 skb = alloc_can_err_skb(dev, &cf);
559 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
561 if (reg_esr & FLEXCAN_ESR_BIT1_ERR) {
562 netdev_dbg(dev, "BIT1_ERR irq\n");
563 cf->data[2] |= CAN_ERR_PROT_BIT1;
566 if (reg_esr & FLEXCAN_ESR_BIT0_ERR) {
567 netdev_dbg(dev, "BIT0_ERR irq\n");
568 cf->data[2] |= CAN_ERR_PROT_BIT0;
571 if (reg_esr & FLEXCAN_ESR_ACK_ERR) {
572 netdev_dbg(dev, "ACK_ERR irq\n");
573 cf->can_id |= CAN_ERR_ACK;
574 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
577 if (reg_esr & FLEXCAN_ESR_CRC_ERR) {
578 netdev_dbg(dev, "CRC_ERR irq\n");
579 cf->data[2] |= CAN_ERR_PROT_BIT;
580 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
583 if (reg_esr & FLEXCAN_ESR_FRM_ERR) {
584 netdev_dbg(dev, "FRM_ERR irq\n");
585 cf->data[2] |= CAN_ERR_PROT_FORM;
588 if (reg_esr & FLEXCAN_ESR_STF_ERR) {
589 netdev_dbg(dev, "STF_ERR irq\n");
590 cf->data[2] |= CAN_ERR_PROT_STUFF;
594 priv->can.can_stats.bus_error++;
596 dev->stats.rx_errors++;
598 dev->stats.tx_errors++;
600 can_rx_offload_irq_queue_err_skb(&priv->offload, skb);
603 static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
605 struct flexcan_priv *priv = netdev_priv(dev);
607 struct can_frame *cf;
608 enum can_state new_state, rx_state, tx_state;
610 struct can_berr_counter bec;
612 flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
613 if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
614 tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
615 CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
616 rx_state = unlikely(reg_esr & FLEXCAN_ESR_RX_WRN) ?
617 CAN_STATE_ERROR_WARNING : CAN_STATE_ERROR_ACTIVE;
618 new_state = max(tx_state, rx_state);
620 __flexcan_get_berr_counter(dev, &bec);
621 new_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ?
622 CAN_STATE_ERROR_PASSIVE : CAN_STATE_BUS_OFF;
623 rx_state = bec.rxerr >= bec.txerr ? new_state : 0;
624 tx_state = bec.rxerr <= bec.txerr ? new_state : 0;
627 /* state hasn't changed */
628 if (likely(new_state == priv->can.state))
631 skb = alloc_can_err_skb(dev, &cf);
635 can_change_state(dev, cf, tx_state, rx_state);
637 if (unlikely(new_state == CAN_STATE_BUS_OFF))
640 can_rx_offload_irq_queue_err_skb(&priv->offload, skb);
643 static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload)
645 return container_of(offload, struct flexcan_priv, offload);
648 static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload,
649 struct can_frame *cf,
650 u32 *timestamp, unsigned int n)
652 struct flexcan_priv *priv = rx_offload_to_priv(offload);
653 struct flexcan_regs __iomem *regs = priv->regs;
654 struct flexcan_mb __iomem *mb = ®s->mb[n];
655 u32 reg_ctrl, reg_id, reg_iflag1;
657 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
661 reg_ctrl = flexcan_read(&mb->can_ctrl);
662 } while (reg_ctrl & FLEXCAN_MB_CODE_RX_BUSY_BIT);
664 /* is this MB empty? */
665 code = reg_ctrl & FLEXCAN_MB_CODE_MASK;
666 if ((code != FLEXCAN_MB_CODE_RX_FULL) &&
667 (code != FLEXCAN_MB_CODE_RX_OVERRUN))
670 if (code == FLEXCAN_MB_CODE_RX_OVERRUN) {
671 /* This MB was overrun, we lost data */
672 offload->dev->stats.rx_over_errors++;
673 offload->dev->stats.rx_errors++;
676 reg_iflag1 = flexcan_read(®s->iflag1);
677 if (!(reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE))
680 reg_ctrl = flexcan_read(&mb->can_ctrl);
683 /* increase timstamp to full 32 bit */
684 *timestamp = reg_ctrl << 16;
686 reg_id = flexcan_read(&mb->can_id);
687 if (reg_ctrl & FLEXCAN_MB_CNT_IDE)
688 cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
690 cf->can_id = (reg_id >> 18) & CAN_SFF_MASK;
692 if (reg_ctrl & FLEXCAN_MB_CNT_RTR)
693 cf->can_id |= CAN_RTR_FLAG;
694 cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf);
696 *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0]));
697 *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1]));
700 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
703 flexcan_write(BIT(n), ®s->iflag1);
705 flexcan_write(BIT(n - 32), ®s->iflag2);
707 flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1);
708 flexcan_read(®s->timer);
715 static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)
717 struct flexcan_regs __iomem *regs = priv->regs;
720 iflag2 = flexcan_read(®s->iflag2) & priv->reg_imask2_default;
721 iflag1 = flexcan_read(®s->iflag1) & priv->reg_imask1_default &
722 ~FLEXCAN_IFLAG_MB(priv->tx_mb_idx);
724 return (u64)iflag2 << 32 | iflag1;
727 static irqreturn_t flexcan_irq(int irq, void *dev_id)
729 struct net_device *dev = dev_id;
730 struct net_device_stats *stats = &dev->stats;
731 struct flexcan_priv *priv = netdev_priv(dev);
732 struct flexcan_regs __iomem *regs = priv->regs;
733 irqreturn_t handled = IRQ_NONE;
734 u32 reg_iflag1, reg_esr;
735 enum can_state last_state = priv->can.state;
737 reg_iflag1 = flexcan_read(®s->iflag1);
739 /* reception interrupt */
740 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
744 while ((reg_iflag = flexcan_read_reg_iflag_rx(priv))) {
745 handled = IRQ_HANDLED;
746 ret = can_rx_offload_irq_offload_timestamp(&priv->offload,
752 if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE) {
753 handled = IRQ_HANDLED;
754 can_rx_offload_irq_offload_fifo(&priv->offload);
757 /* FIFO overflow interrupt */
758 if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) {
759 handled = IRQ_HANDLED;
760 flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1);
761 dev->stats.rx_over_errors++;
762 dev->stats.rx_errors++;
766 /* transmission complete interrupt */
767 if (reg_iflag1 & FLEXCAN_IFLAG_MB(priv->tx_mb_idx)) {
768 handled = IRQ_HANDLED;
769 stats->tx_bytes += can_get_echo_skb(dev, 0);
771 can_led_event(dev, CAN_LED_EVENT_TX);
773 /* after sending a RTR frame MB is in RX mode */
774 flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
775 &priv->tx_mb->can_ctrl);
776 flexcan_write(FLEXCAN_IFLAG_MB(priv->tx_mb_idx), ®s->iflag1);
777 netif_wake_queue(dev);
780 reg_esr = flexcan_read(®s->esr);
782 /* ACK all bus error and state change IRQ sources */
783 if (reg_esr & FLEXCAN_ESR_ALL_INT) {
784 handled = IRQ_HANDLED;
785 flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, ®s->esr);
788 /* state change interrupt or broken error state quirk fix is enabled */
789 if ((reg_esr & FLEXCAN_ESR_ERR_STATE) ||
790 (priv->devtype_data->quirks & (FLEXCAN_QUIRK_BROKEN_WERR_STATE |
791 FLEXCAN_QUIRK_BROKEN_PERR_STATE)))
792 flexcan_irq_state(dev, reg_esr);
794 /* bus error IRQ - handle if bus error reporting is activated */
795 if ((reg_esr & FLEXCAN_ESR_ERR_BUS) &&
796 (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
797 flexcan_irq_bus_err(dev, reg_esr);
799 /* availability of error interrupt among state transitions in case
800 * bus error reporting is de-activated and
801 * FLEXCAN_QUIRK_BROKEN_PERR_STATE is enabled:
802 * +--------------------------------------------------------------+
803 * | +----------------------------------------------+ [stopped / |
805 * +-+-> active <-> warning <-> passive -> bus off -+
806 * ___________^^^^^^^^^^^^_______________________________
807 * disabled(1) enabled disabled
809 * (1): enabled if FLEXCAN_QUIRK_BROKEN_WERR_STATE is enabled
811 if ((last_state != priv->can.state) &&
812 (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_PERR_STATE) &&
813 !(priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)) {
814 switch (priv->can.state) {
815 case CAN_STATE_ERROR_ACTIVE:
816 if (priv->devtype_data->quirks &
817 FLEXCAN_QUIRK_BROKEN_WERR_STATE)
818 flexcan_error_irq_enable(priv);
820 flexcan_error_irq_disable(priv);
823 case CAN_STATE_ERROR_WARNING:
824 flexcan_error_irq_enable(priv);
827 case CAN_STATE_ERROR_PASSIVE:
828 case CAN_STATE_BUS_OFF:
829 flexcan_error_irq_disable(priv);
840 static void flexcan_set_bittiming(struct net_device *dev)
842 const struct flexcan_priv *priv = netdev_priv(dev);
843 const struct can_bittiming *bt = &priv->can.bittiming;
844 struct flexcan_regs __iomem *regs = priv->regs;
847 reg = flexcan_read(®s->ctrl);
848 reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) |
849 FLEXCAN_CTRL_RJW(0x3) |
850 FLEXCAN_CTRL_PSEG1(0x7) |
851 FLEXCAN_CTRL_PSEG2(0x7) |
852 FLEXCAN_CTRL_PROPSEG(0x7) |
857 reg |= FLEXCAN_CTRL_PRESDIV(bt->brp - 1) |
858 FLEXCAN_CTRL_PSEG1(bt->phase_seg1 - 1) |
859 FLEXCAN_CTRL_PSEG2(bt->phase_seg2 - 1) |
860 FLEXCAN_CTRL_RJW(bt->sjw - 1) |
861 FLEXCAN_CTRL_PROPSEG(bt->prop_seg - 1);
863 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
864 reg |= FLEXCAN_CTRL_LPB;
865 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
866 reg |= FLEXCAN_CTRL_LOM;
867 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
868 reg |= FLEXCAN_CTRL_SMP;
870 netdev_dbg(dev, "writing ctrl=0x%08x\n", reg);
871 flexcan_write(reg, ®s->ctrl);
873 /* print chip status */
874 netdev_dbg(dev, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__,
875 flexcan_read(®s->mcr), flexcan_read(®s->ctrl));
878 /* flexcan_chip_start
880 * this functions is entered with clocks enabled
883 static int flexcan_chip_start(struct net_device *dev)
885 struct flexcan_priv *priv = netdev_priv(dev);
886 struct flexcan_regs __iomem *regs = priv->regs;
887 u32 reg_mcr, reg_ctrl, reg_ctrl2, reg_mecr;
891 err = flexcan_chip_enable(priv);
896 err = flexcan_chip_softreset(priv);
898 goto out_chip_disable;
900 flexcan_set_bittiming(dev);
907 * only supervisor access
910 * enable individual RX masking
912 * set max mailbox number
914 reg_mcr = flexcan_read(®s->mcr);
915 reg_mcr &= ~FLEXCAN_MCR_MAXMB(0xff);
916 reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT | FLEXCAN_MCR_SUPV |
917 FLEXCAN_MCR_WRN_EN | FLEXCAN_MCR_SRX_DIS | FLEXCAN_MCR_IRMQ |
920 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
921 reg_mcr &= ~FLEXCAN_MCR_FEN;
922 reg_mcr |= FLEXCAN_MCR_MAXMB(priv->offload.mb_last);
924 reg_mcr |= FLEXCAN_MCR_FEN |
925 FLEXCAN_MCR_MAXMB(priv->tx_mb_idx);
927 netdev_dbg(dev, "%s: writing mcr=0x%08x", __func__, reg_mcr);
928 flexcan_write(reg_mcr, ®s->mcr);
932 * disable timer sync feature
934 * disable auto busoff recovery
935 * transmit lowest buffer first
937 * enable tx and rx warning interrupt
938 * enable bus off interrupt
939 * (== FLEXCAN_CTRL_ERR_STATE)
941 reg_ctrl = flexcan_read(®s->ctrl);
942 reg_ctrl &= ~FLEXCAN_CTRL_TSYN;
943 reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF |
944 FLEXCAN_CTRL_ERR_STATE;
946 /* enable the "error interrupt" (FLEXCAN_CTRL_ERR_MSK),
947 * on most Flexcan cores, too. Otherwise we don't get
948 * any error warning or passive interrupts.
950 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_WERR_STATE ||
951 priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
952 reg_ctrl |= FLEXCAN_CTRL_ERR_MSK;
954 reg_ctrl &= ~FLEXCAN_CTRL_ERR_MSK;
956 /* save for later use */
957 priv->reg_ctrl_default = reg_ctrl;
958 /* leave interrupts disabled for now */
959 reg_ctrl &= ~FLEXCAN_CTRL_ERR_ALL;
960 netdev_dbg(dev, "%s: writing ctrl=0x%08x", __func__, reg_ctrl);
961 flexcan_write(reg_ctrl, ®s->ctrl);
963 if ((priv->devtype_data->quirks & FLEXCAN_QUIRK_ENABLE_EACEN_RRS)) {
964 reg_ctrl2 = flexcan_read(®s->ctrl2);
965 reg_ctrl2 |= FLEXCAN_CTRL2_EACEN | FLEXCAN_CTRL2_RRS;
966 flexcan_write(reg_ctrl2, ®s->ctrl2);
969 /* clear and invalidate all mailboxes first */
970 for (i = priv->tx_mb_idx; i < ARRAY_SIZE(regs->mb); i++) {
971 flexcan_write(FLEXCAN_MB_CODE_RX_INACTIVE,
972 ®s->mb[i].can_ctrl);
975 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
976 for (i = priv->offload.mb_first; i <= priv->offload.mb_last; i++)
977 flexcan_write(FLEXCAN_MB_CODE_RX_EMPTY,
978 ®s->mb[i].can_ctrl);
981 /* Errata ERR005829: mark first TX mailbox as INACTIVE */
982 flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
983 &priv->tx_mb_reserved->can_ctrl);
985 /* mark TX mailbox as INACTIVE */
986 flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
987 &priv->tx_mb->can_ctrl);
989 /* acceptance mask/acceptance code (accept everything) */
990 flexcan_write(0x0, ®s->rxgmask);
991 flexcan_write(0x0, ®s->rx14mask);
992 flexcan_write(0x0, ®s->rx15mask);
994 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_RXFG)
995 flexcan_write(0x0, ®s->rxfgmask);
997 /* clear acceptance filters */
998 for (i = 0; i < ARRAY_SIZE(regs->mb); i++)
999 flexcan_write(0, ®s->rximr[i]);
1001 /* On Vybrid, disable memory error detection interrupts
1003 * This also works around errata e5295 which generates
1004 * false positive memory errors and put the device in
1007 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_DISABLE_MECR) {
1008 /* Follow the protocol as described in "Detection
1009 * and Correction of Memory Errors" to write to
1012 reg_ctrl2 = flexcan_read(®s->ctrl2);
1013 reg_ctrl2 |= FLEXCAN_CTRL2_ECRWRE;
1014 flexcan_write(reg_ctrl2, ®s->ctrl2);
1016 reg_mecr = flexcan_read(®s->mecr);
1017 reg_mecr &= ~FLEXCAN_MECR_ECRWRDIS;
1018 flexcan_write(reg_mecr, ®s->mecr);
1019 reg_mecr &= ~(FLEXCAN_MECR_NCEFAFRZ | FLEXCAN_MECR_HANCEI_MSK |
1020 FLEXCAN_MECR_FANCEI_MSK);
1021 flexcan_write(reg_mecr, ®s->mecr);
1024 err = flexcan_transceiver_enable(priv);
1026 goto out_chip_disable;
1028 /* synchronize with the can bus */
1029 err = flexcan_chip_unfreeze(priv);
1031 goto out_transceiver_disable;
1033 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1035 /* enable interrupts atomically */
1036 disable_irq(dev->irq);
1037 flexcan_write(priv->reg_ctrl_default, ®s->ctrl);
1038 flexcan_write(priv->reg_imask1_default, ®s->imask1);
1039 flexcan_write(priv->reg_imask2_default, ®s->imask2);
1040 enable_irq(dev->irq);
1042 /* print chip status */
1043 netdev_dbg(dev, "%s: reading mcr=0x%08x ctrl=0x%08x\n", __func__,
1044 flexcan_read(®s->mcr), flexcan_read(®s->ctrl));
1048 out_transceiver_disable:
1049 flexcan_transceiver_disable(priv);
1051 flexcan_chip_disable(priv);
1055 /* flexcan_chip_stop
1057 * this functions is entered with clocks enabled
1059 static void flexcan_chip_stop(struct net_device *dev)
1061 struct flexcan_priv *priv = netdev_priv(dev);
1062 struct flexcan_regs __iomem *regs = priv->regs;
1064 /* freeze + disable module */
1065 flexcan_chip_freeze(priv);
1066 flexcan_chip_disable(priv);
1068 /* Disable all interrupts */
1069 flexcan_write(0, ®s->imask2);
1070 flexcan_write(0, ®s->imask1);
1071 flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
1074 flexcan_transceiver_disable(priv);
1075 priv->can.state = CAN_STATE_STOPPED;
1078 static int flexcan_open(struct net_device *dev)
1080 struct flexcan_priv *priv = netdev_priv(dev);
1083 err = clk_prepare_enable(priv->clk_ipg);
1087 err = clk_prepare_enable(priv->clk_per);
1089 goto out_disable_ipg;
1091 err = open_candev(dev);
1093 goto out_disable_per;
1095 err = request_irq(dev->irq, flexcan_irq, IRQF_SHARED, dev->name, dev);
1099 /* start chip and queuing */
1100 err = flexcan_chip_start(dev);
1104 can_led_event(dev, CAN_LED_EVENT_OPEN);
1106 can_rx_offload_enable(&priv->offload);
1107 netif_start_queue(dev);
1112 free_irq(dev->irq, dev);
1116 clk_disable_unprepare(priv->clk_per);
1118 clk_disable_unprepare(priv->clk_ipg);
1123 static int flexcan_close(struct net_device *dev)
1125 struct flexcan_priv *priv = netdev_priv(dev);
1127 netif_stop_queue(dev);
1128 can_rx_offload_disable(&priv->offload);
1129 flexcan_chip_stop(dev);
1131 free_irq(dev->irq, dev);
1132 clk_disable_unprepare(priv->clk_per);
1133 clk_disable_unprepare(priv->clk_ipg);
1137 can_led_event(dev, CAN_LED_EVENT_STOP);
1142 static int flexcan_set_mode(struct net_device *dev, enum can_mode mode)
1147 case CAN_MODE_START:
1148 err = flexcan_chip_start(dev);
1152 netif_wake_queue(dev);
1162 static const struct net_device_ops flexcan_netdev_ops = {
1163 .ndo_open = flexcan_open,
1164 .ndo_stop = flexcan_close,
1165 .ndo_start_xmit = flexcan_start_xmit,
1166 .ndo_change_mtu = can_change_mtu,
1169 static int register_flexcandev(struct net_device *dev)
1171 struct flexcan_priv *priv = netdev_priv(dev);
1172 struct flexcan_regs __iomem *regs = priv->regs;
1175 err = clk_prepare_enable(priv->clk_ipg);
1179 err = clk_prepare_enable(priv->clk_per);
1181 goto out_disable_ipg;
1183 /* select "bus clock", chip must be disabled */
1184 err = flexcan_chip_disable(priv);
1186 goto out_disable_per;
1187 reg = flexcan_read(®s->ctrl);
1188 reg |= FLEXCAN_CTRL_CLK_SRC;
1189 flexcan_write(reg, ®s->ctrl);
1191 err = flexcan_chip_enable(priv);
1193 goto out_chip_disable;
1195 /* set freeze, halt and activate FIFO, restrict register access */
1196 reg = flexcan_read(®s->mcr);
1197 reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT |
1198 FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV;
1199 flexcan_write(reg, ®s->mcr);
1201 /* Currently we only support newer versions of this core
1202 * featuring a RX hardware FIFO (although this driver doesn't
1203 * make use of it on some cores). Older cores, found on some
1204 * Coldfire derivates are not tested.
1206 reg = flexcan_read(®s->mcr);
1207 if (!(reg & FLEXCAN_MCR_FEN)) {
1208 netdev_err(dev, "Could not enable RX FIFO, unsupported core\n");
1210 goto out_chip_disable;
1213 err = register_candev(dev);
1215 /* disable core and turn off clocks */
1217 flexcan_chip_disable(priv);
1219 clk_disable_unprepare(priv->clk_per);
1221 clk_disable_unprepare(priv->clk_ipg);
1226 static void unregister_flexcandev(struct net_device *dev)
1228 unregister_candev(dev);
1231 static const struct of_device_id flexcan_of_match[] = {
1232 { .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
1233 { .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
1234 { .compatible = "fsl,p1010-flexcan", .data = &fsl_p1010_devtype_data, },
1235 { .compatible = "fsl,vf610-flexcan", .data = &fsl_vf610_devtype_data, },
1238 MODULE_DEVICE_TABLE(of, flexcan_of_match);
1240 static const struct platform_device_id flexcan_id_table[] = {
1241 { .name = "flexcan", .driver_data = (kernel_ulong_t)&fsl_p1010_devtype_data, },
1244 MODULE_DEVICE_TABLE(platform, flexcan_id_table);
1246 static int flexcan_probe(struct platform_device *pdev)
1248 const struct of_device_id *of_id;
1249 const struct flexcan_devtype_data *devtype_data;
1250 struct net_device *dev;
1251 struct flexcan_priv *priv;
1252 struct regulator *reg_xceiver;
1253 struct resource *mem;
1254 struct clk *clk_ipg = NULL, *clk_per = NULL;
1255 struct flexcan_regs __iomem *regs;
1259 reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");
1260 if (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)
1261 return -EPROBE_DEFER;
1262 else if (IS_ERR(reg_xceiver))
1265 if (pdev->dev.of_node)
1266 of_property_read_u32(pdev->dev.of_node,
1267 "clock-frequency", &clock_freq);
1270 clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1271 if (IS_ERR(clk_ipg)) {
1272 dev_err(&pdev->dev, "no ipg clock defined\n");
1273 return PTR_ERR(clk_ipg);
1276 clk_per = devm_clk_get(&pdev->dev, "per");
1277 if (IS_ERR(clk_per)) {
1278 dev_err(&pdev->dev, "no per clock defined\n");
1279 return PTR_ERR(clk_per);
1281 clock_freq = clk_get_rate(clk_per);
1284 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1285 irq = platform_get_irq(pdev, 0);
1289 regs = devm_ioremap_resource(&pdev->dev, mem);
1291 return PTR_ERR(regs);
1293 of_id = of_match_device(flexcan_of_match, &pdev->dev);
1295 devtype_data = of_id->data;
1296 } else if (platform_get_device_id(pdev)->driver_data) {
1297 devtype_data = (struct flexcan_devtype_data *)
1298 platform_get_device_id(pdev)->driver_data;
1303 dev = alloc_candev(sizeof(struct flexcan_priv), 1);
1307 platform_set_drvdata(pdev, dev);
1308 SET_NETDEV_DEV(dev, &pdev->dev);
1310 dev->netdev_ops = &flexcan_netdev_ops;
1312 dev->flags |= IFF_ECHO;
1314 priv = netdev_priv(dev);
1315 priv->can.clock.freq = clock_freq;
1316 priv->can.bittiming_const = &flexcan_bittiming_const;
1317 priv->can.do_set_mode = flexcan_set_mode;
1318 priv->can.do_get_berr_counter = flexcan_get_berr_counter;
1319 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
1320 CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_3_SAMPLES |
1321 CAN_CTRLMODE_BERR_REPORTING;
1323 priv->clk_ipg = clk_ipg;
1324 priv->clk_per = clk_per;
1325 priv->devtype_data = devtype_data;
1326 priv->reg_xceiver = reg_xceiver;
1328 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
1329 priv->tx_mb_idx = FLEXCAN_TX_MB_OFF_TIMESTAMP;
1330 priv->tx_mb_reserved = ®s->mb[FLEXCAN_TX_MB_RESERVED_OFF_TIMESTAMP];
1332 priv->tx_mb_idx = FLEXCAN_TX_MB_OFF_FIFO;
1333 priv->tx_mb_reserved = ®s->mb[FLEXCAN_TX_MB_RESERVED_OFF_FIFO];
1335 priv->tx_mb = ®s->mb[priv->tx_mb_idx];
1337 priv->reg_imask1_default = FLEXCAN_IFLAG_MB(priv->tx_mb_idx);
1338 priv->reg_imask2_default = 0;
1340 priv->offload.mailbox_read = flexcan_mailbox_read;
1342 if (priv->devtype_data->quirks & FLEXCAN_QUIRK_USE_OFF_TIMESTAMP) {
1345 priv->offload.mb_first = FLEXCAN_RX_MB_OFF_TIMESTAMP_FIRST;
1346 priv->offload.mb_last = FLEXCAN_RX_MB_OFF_TIMESTAMP_LAST;
1348 imask = GENMASK_ULL(priv->offload.mb_last, priv->offload.mb_first);
1349 priv->reg_imask1_default |= imask;
1350 priv->reg_imask2_default |= imask >> 32;
1352 err = can_rx_offload_add_timestamp(dev, &priv->offload);
1354 priv->reg_imask1_default |= FLEXCAN_IFLAG_RX_FIFO_OVERFLOW |
1355 FLEXCAN_IFLAG_RX_FIFO_AVAILABLE;
1356 err = can_rx_offload_add_fifo(dev, &priv->offload, FLEXCAN_NAPI_WEIGHT);
1359 goto failed_offload;
1361 err = register_flexcandev(dev);
1363 dev_err(&pdev->dev, "registering netdev failed\n");
1364 goto failed_register;
1367 devm_can_led_init(dev);
1369 dev_info(&pdev->dev, "device registered (reg_base=%p, irq=%d)\n",
1370 priv->regs, dev->irq);
1380 static int flexcan_remove(struct platform_device *pdev)
1382 struct net_device *dev = platform_get_drvdata(pdev);
1383 struct flexcan_priv *priv = netdev_priv(dev);
1385 unregister_flexcandev(dev);
1386 can_rx_offload_del(&priv->offload);
1392 static int __maybe_unused flexcan_suspend(struct device *device)
1394 struct net_device *dev = dev_get_drvdata(device);
1395 struct flexcan_priv *priv = netdev_priv(dev);
1398 if (netif_running(dev)) {
1399 err = flexcan_chip_disable(priv);
1402 netif_stop_queue(dev);
1403 netif_device_detach(dev);
1405 priv->can.state = CAN_STATE_SLEEPING;
1410 static int __maybe_unused flexcan_resume(struct device *device)
1412 struct net_device *dev = dev_get_drvdata(device);
1413 struct flexcan_priv *priv = netdev_priv(dev);
1416 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1417 if (netif_running(dev)) {
1418 netif_device_attach(dev);
1419 netif_start_queue(dev);
1420 err = flexcan_chip_enable(priv);
1427 static SIMPLE_DEV_PM_OPS(flexcan_pm_ops, flexcan_suspend, flexcan_resume);
1429 static struct platform_driver flexcan_driver = {
1432 .pm = &flexcan_pm_ops,
1433 .of_match_table = flexcan_of_match,
1435 .probe = flexcan_probe,
1436 .remove = flexcan_remove,
1437 .id_table = flexcan_id_table,
1440 module_platform_driver(flexcan_driver);
1442 MODULE_AUTHOR("Sascha Hauer <kernel@pengutronix.de>, "
1443 "Marc Kleine-Budde <kernel@pengutronix.de>");
1444 MODULE_LICENSE("GPL v2");
1445 MODULE_DESCRIPTION("CAN port driver for flexcan based chip");