Lines Matching +full:spi +full:- +full:crc
1 // SPDX-License-Identifier: GPL-2.0
3 // mcp251xfd - Microchip MCP251xFD Family CAN controller driver
6 // Marc Kleine-Budde <kernel@pengutronix.de>
10 // CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
18 #include "mcp251xfd-ram.h"
31 len = last_byte - first_byte + 1; in mcp251xfd_cmd_prepare_write_reg()
37 if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_REG) { in mcp251xfd_cmd_prepare_write_reg()
38 u16 crc; in mcp251xfd_cmd_prepare_write_reg() local
40 mcp251xfd_spi_cmd_crc_set_len_in_reg(&write_reg_buf->crc.cmd, in mcp251xfd_cmd_prepare_write_reg()
42 /* CRC */ in mcp251xfd_cmd_prepare_write_reg()
43 len += sizeof(write_reg_buf->crc.cmd); in mcp251xfd_cmd_prepare_write_reg()
44 crc = mcp251xfd_crc16_compute(&write_reg_buf->crc, len); in mcp251xfd_cmd_prepare_write_reg()
45 put_unaligned_be16(crc, (void *)write_reg_buf + len); in mcp251xfd_cmd_prepare_write_reg()
48 len += sizeof(write_reg_buf->crc.crc); in mcp251xfd_cmd_prepare_write_reg()
50 len += sizeof(write_reg_buf->nocrc.cmd); in mcp251xfd_cmd_prepare_write_reg()
67 tef_ring = priv->tef; in mcp251xfd_ring_init_tef()
68 tef_ring->head = 0; in mcp251xfd_ring_init_tef()
69 tef_ring->tail = 0; in mcp251xfd_ring_init_tef()
71 /* TEF- and TX-FIFO have same number of objects */ in mcp251xfd_ring_init_tef()
72 *base = mcp251xfd_get_tef_obj_addr(priv->tx->obj_num); in mcp251xfd_ring_init_tef()
78 len = mcp251xfd_cmd_prepare_write_reg(priv, &tef_ring->irq_enable_buf, in mcp251xfd_ring_init_tef()
80 tef_ring->irq_enable_xfer.tx_buf = &tef_ring->irq_enable_buf; in mcp251xfd_ring_init_tef()
81 tef_ring->irq_enable_xfer.len = len; in mcp251xfd_ring_init_tef()
82 spi_message_init_with_transfers(&tef_ring->irq_enable_msg, in mcp251xfd_ring_init_tef()
83 &tef_ring->irq_enable_xfer, 1); in mcp251xfd_ring_init_tef()
88 len = mcp251xfd_cmd_prepare_write_reg(priv, &tef_ring->uinc_buf, in mcp251xfd_ring_init_tef()
91 for (i = 0; i < ARRAY_SIZE(tef_ring->uinc_xfer); i++) { in mcp251xfd_ring_init_tef()
92 xfer = &tef_ring->uinc_xfer[i]; in mcp251xfd_ring_init_tef()
93 xfer->tx_buf = &tef_ring->uinc_buf; in mcp251xfd_ring_init_tef()
94 xfer->len = len; in mcp251xfd_ring_init_tef()
95 xfer->cs_change = 1; in mcp251xfd_ring_init_tef()
96 xfer->cs_change_delay.value = 0; in mcp251xfd_ring_init_tef()
97 xfer->cs_change_delay.unit = SPI_DELAY_UNIT_NSECS; in mcp251xfd_ring_init_tef()
101 * chip select after the complete SPI message. This causes the in mcp251xfd_ring_init_tef()
107 xfer->cs_change = 0; in mcp251xfd_ring_init_tef()
109 if (priv->tx_coalesce_usecs_irq || priv->tx_obj_num_coalesce_irq) { in mcp251xfd_ring_init_tef()
115 &tef_ring->uinc_irq_disable_buf, in mcp251xfd_ring_init_tef()
117 xfer->tx_buf = &tef_ring->uinc_irq_disable_buf; in mcp251xfd_ring_init_tef()
118 xfer->len = len; in mcp251xfd_ring_init_tef()
134 if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) in mcp251xfd_tx_ring_init_tx_obj()
135 mcp251xfd_spi_cmd_write_crc_set_addr(&tx_obj->buf.crc.cmd, in mcp251xfd_tx_ring_init_tx_obj()
138 mcp251xfd_spi_cmd_write_nocrc(&tx_obj->buf.nocrc.cmd, in mcp251xfd_tx_ring_init_tx_obj()
141 xfer = &tx_obj->xfer[0]; in mcp251xfd_tx_ring_init_tx_obj()
142 xfer->tx_buf = &tx_obj->buf; in mcp251xfd_tx_ring_init_tx_obj()
143 xfer->len = 0; /* actual len is assigned on the fly */ in mcp251xfd_tx_ring_init_tx_obj()
144 xfer->cs_change = 1; in mcp251xfd_tx_ring_init_tx_obj()
145 xfer->cs_change_delay.value = 0; in mcp251xfd_tx_ring_init_tx_obj()
146 xfer->cs_change_delay.unit = SPI_DELAY_UNIT_NSECS; in mcp251xfd_tx_ring_init_tx_obj()
149 xfer = &tx_obj->xfer[1]; in mcp251xfd_tx_ring_init_tx_obj()
150 xfer->tx_buf = &ring->rts_buf; in mcp251xfd_tx_ring_init_tx_obj()
151 xfer->len = rts_buf_len; in mcp251xfd_tx_ring_init_tx_obj()
153 /* SPI message */ in mcp251xfd_tx_ring_init_tx_obj()
154 spi_message_init_with_transfers(&tx_obj->msg, tx_obj->xfer, in mcp251xfd_tx_ring_init_tx_obj()
155 ARRAY_SIZE(tx_obj->xfer)); in mcp251xfd_tx_ring_init_tx_obj()
168 tx_ring = priv->tx; in mcp251xfd_ring_init_tx()
169 tx_ring->head = 0; in mcp251xfd_ring_init_tx()
170 tx_ring->tail = 0; in mcp251xfd_ring_init_tx()
171 tx_ring->base = *base; in mcp251xfd_ring_init_tx()
172 tx_ring->nr = 0; in mcp251xfd_ring_init_tx()
173 tx_ring->fifo_nr = *fifo_nr; in mcp251xfd_ring_init_tx()
175 *base = mcp251xfd_get_tx_obj_addr(tx_ring, tx_ring->obj_num); in mcp251xfd_ring_init_tx()
179 addr = MCP251XFD_REG_FIFOCON(tx_ring->fifo_nr); in mcp251xfd_ring_init_tx()
181 len = mcp251xfd_cmd_prepare_write_reg(priv, &tx_ring->rts_buf, in mcp251xfd_ring_init_tx()
199 rx_ring->head = 0; in mcp251xfd_ring_init_rx()
200 rx_ring->tail = 0; in mcp251xfd_ring_init_rx()
201 rx_ring->base = *base; in mcp251xfd_ring_init_rx()
202 rx_ring->nr = i; in mcp251xfd_ring_init_rx()
203 rx_ring->fifo_nr = *fifo_nr; in mcp251xfd_ring_init_rx()
205 *base = mcp251xfd_get_rx_obj_addr(rx_ring, rx_ring->obj_num); in mcp251xfd_ring_init_rx()
209 addr = MCP251XFD_REG_FIFOCON(rx_ring->fifo_nr); in mcp251xfd_ring_init_rx()
212 len = mcp251xfd_cmd_prepare_write_reg(priv, &rx_ring->irq_enable_buf, in mcp251xfd_ring_init_rx()
214 rx_ring->irq_enable_xfer.tx_buf = &rx_ring->irq_enable_buf; in mcp251xfd_ring_init_rx()
215 rx_ring->irq_enable_xfer.len = len; in mcp251xfd_ring_init_rx()
216 spi_message_init_with_transfers(&rx_ring->irq_enable_msg, in mcp251xfd_ring_init_rx()
217 &rx_ring->irq_enable_xfer, 1); in mcp251xfd_ring_init_rx()
221 len = mcp251xfd_cmd_prepare_write_reg(priv, &rx_ring->uinc_buf, in mcp251xfd_ring_init_rx()
224 for (j = 0; j < ARRAY_SIZE(rx_ring->uinc_xfer); j++) { in mcp251xfd_ring_init_rx()
225 xfer = &rx_ring->uinc_xfer[j]; in mcp251xfd_ring_init_rx()
226 xfer->tx_buf = &rx_ring->uinc_buf; in mcp251xfd_ring_init_rx()
227 xfer->len = len; in mcp251xfd_ring_init_rx()
228 xfer->cs_change = 1; in mcp251xfd_ring_init_rx()
229 xfer->cs_change_delay.value = 0; in mcp251xfd_ring_init_rx()
230 xfer->cs_change_delay.unit = SPI_DELAY_UNIT_NSECS; in mcp251xfd_ring_init_rx()
234 * active chip select after the complete SPI in mcp251xfd_ring_init_rx()
240 xfer->cs_change = 0; in mcp251xfd_ring_init_rx()
242 /* Use 1st RX-FIFO for IRQ coalescing. If enabled in mcp251xfd_ring_init_rx()
246 * - TFNRFNIE (Receive FIFO Not Empty Interrupt) in mcp251xfd_ring_init_rx()
250 * - TFHRFHIE (Receive FIFO Half Full Interrupt) in mcp251xfd_ring_init_rx()
251 * - or - in mcp251xfd_ring_init_rx()
252 * - TFERFFIE (Receive FIFO Full Interrupt) in mcp251xfd_ring_init_rx()
258 if (rx_ring->nr == 0 && (priv->rx_coalesce_usecs_irq || in mcp251xfd_ring_init_rx()
259 priv->rx_obj_num_coalesce_irq)) { in mcp251xfd_ring_init_rx()
263 if (priv->rx_obj_num_coalesce_irq == rx_ring->obj_num) in mcp251xfd_ring_init_rx()
265 else if (priv->rx_obj_num_coalesce_irq) in mcp251xfd_ring_init_rx()
269 &rx_ring->uinc_irq_disable_buf, in mcp251xfd_ring_init_rx()
271 xfer->tx_buf = &rx_ring->uinc_irq_disable_buf; in mcp251xfd_ring_init_rx()
272 xfer->len = len; in mcp251xfd_ring_init_rx()
284 netdev_reset_queue(priv->ndev); in mcp251xfd_ring_init()
292 * priv->regs_status.rxif are read out. in mcp251xfd_ring_init()
294 * If the chip is configured for only 1 RX-FIFO, and if there in mcp251xfd_ring_init()
296 * it must be the 1st RX-FIFO. in mcp251xfd_ring_init()
300 * mcp251xfd_read_regs_status() for the 1 RX-FIFO only case. in mcp251xfd_ring_init()
302 * If we use more than 1 RX-FIFO, this value gets overwritten in mcp251xfd_ring_init()
306 priv->regs_status.rxif = BIT(priv->rx[0]->fifo_nr); in mcp251xfd_ring_init()
308 if (priv->tx_obj_num_coalesce_irq) { in mcp251xfd_ring_init()
309 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
312 priv->tx_obj_num_coalesce_irq, in mcp251xfd_ring_init()
314 priv->tx_obj_num_coalesce_irq * in mcp251xfd_ring_init()
317 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
319 mcp251xfd_get_tef_obj_addr(priv->tx_obj_num_coalesce_irq), in mcp251xfd_ring_init()
320 priv->tx->obj_num - priv->tx_obj_num_coalesce_irq, in mcp251xfd_ring_init()
322 (priv->tx->obj_num - priv->tx_obj_num_coalesce_irq) * in mcp251xfd_ring_init()
325 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
328 priv->tx->obj_num, sizeof(struct mcp251xfd_hw_tef_obj), in mcp251xfd_ring_init()
329 priv->tx->obj_num * sizeof(struct mcp251xfd_hw_tef_obj)); in mcp251xfd_ring_init()
333 if (rx_ring->nr == 0 && priv->rx_obj_num_coalesce_irq) { in mcp251xfd_ring_init()
334 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
335 "FIFO setup: RX-%u: FIFO %u/0x%03x: %2u*%u bytes = %4u bytes (coalesce)\n", in mcp251xfd_ring_init()
336 rx_ring->nr, rx_ring->fifo_nr, in mcp251xfd_ring_init()
338 priv->rx_obj_num_coalesce_irq, rx_ring->obj_size, in mcp251xfd_ring_init()
339 priv->rx_obj_num_coalesce_irq * rx_ring->obj_size); in mcp251xfd_ring_init()
341 if (priv->rx_obj_num_coalesce_irq == MCP251XFD_FIFO_DEPTH) in mcp251xfd_ring_init()
344 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
347 priv->rx_obj_num_coalesce_irq), in mcp251xfd_ring_init()
348 rx_ring->obj_num - priv->rx_obj_num_coalesce_irq, in mcp251xfd_ring_init()
349 rx_ring->obj_size, in mcp251xfd_ring_init()
350 (rx_ring->obj_num - priv->rx_obj_num_coalesce_irq) * in mcp251xfd_ring_init()
351 rx_ring->obj_size); in mcp251xfd_ring_init()
353 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
354 "FIFO setup: RX-%u: FIFO %u/0x%03x: %2u*%u bytes = %4u bytes\n", in mcp251xfd_ring_init()
355 rx_ring->nr, rx_ring->fifo_nr, in mcp251xfd_ring_init()
357 rx_ring->obj_num, rx_ring->obj_size, in mcp251xfd_ring_init()
358 rx_ring->obj_num * rx_ring->obj_size); in mcp251xfd_ring_init()
362 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
364 priv->tx->fifo_nr, in mcp251xfd_ring_init()
365 mcp251xfd_get_tx_obj_addr(priv->tx, 0), in mcp251xfd_ring_init()
366 priv->tx->obj_num, priv->tx->obj_size, in mcp251xfd_ring_init()
367 priv->tx->obj_num * priv->tx->obj_size); in mcp251xfd_ring_init()
369 netdev_dbg(priv->ndev, in mcp251xfd_ring_init()
371 MCP251XFD_RAM_SIZE - (base - MCP251XFD_RAM_START)); in mcp251xfd_ring_init()
373 ram_used = base - MCP251XFD_RAM_START; in mcp251xfd_ring_init()
375 netdev_err(priv->ndev, in mcp251xfd_ring_init()
378 return -ENOMEM; in mcp251xfd_ring_init()
388 for (i = ARRAY_SIZE(priv->rx) - 1; i >= 0; i--) { in mcp251xfd_ring_free()
389 kfree(priv->rx[i]); in mcp251xfd_ring_free()
390 priv->rx[i] = NULL; in mcp251xfd_ring_free()
398 struct mcp251xfd_rx_ring *ring = priv->rx[0]; in mcp251xfd_rx_irq_timer()
400 if (test_bit(MCP251XFD_FLAGS_DOWN, priv->flags)) in mcp251xfd_rx_irq_timer()
403 spi_async(priv->spi, &ring->irq_enable_msg); in mcp251xfd_rx_irq_timer()
412 struct mcp251xfd_tef_ring *ring = priv->tef; in mcp251xfd_tx_irq_timer()
414 if (test_bit(MCP251XFD_FLAGS_DOWN, priv->flags)) in mcp251xfd_tx_irq_timer()
417 spi_async(priv->spi, &ring->irq_enable_msg); in mcp251xfd_tx_irq_timer()
454 struct mcp251xfd_tx_ring *tx_ring = priv->tx; in mcp251xfd_ring_alloc()
459 /* switching from CAN-2.0 to CAN-FD mode or vice versa */ in mcp251xfd_ring_alloc()
460 if (fd_mode != test_bit(MCP251XFD_FLAGS_FD_MODE, priv->flags)) { in mcp251xfd_ring_alloc()
464 priv->rx_obj_num = layout.default_rx; in mcp251xfd_ring_alloc()
465 tx_ring->obj_num = layout.default_tx; in mcp251xfd_ring_alloc()
471 set_bit(MCP251XFD_FLAGS_FD_MODE, priv->flags); in mcp251xfd_ring_alloc()
475 clear_bit(MCP251XFD_FLAGS_FD_MODE, priv->flags); in mcp251xfd_ring_alloc()
478 tx_ring->obj_size = tx_obj_size; in mcp251xfd_ring_alloc()
480 rem = priv->rx_obj_num; in mcp251xfd_ring_alloc()
481 for (i = 0; i < ARRAY_SIZE(priv->rx) && rem; i++) { in mcp251xfd_ring_alloc()
484 if (i == 0 && priv->rx_obj_num_coalesce_irq) in mcp251xfd_ring_alloc()
485 rx_obj_num = min_t(u8, priv->rx_obj_num_coalesce_irq * 2, in mcp251xfd_ring_alloc()
490 rem -= rx_obj_num; in mcp251xfd_ring_alloc()
496 return -ENOMEM; in mcp251xfd_ring_alloc()
499 rx_ring->obj_num = rx_obj_num; in mcp251xfd_ring_alloc()
500 rx_ring->obj_size = rx_obj_size; in mcp251xfd_ring_alloc()
501 priv->rx[i] = rx_ring; in mcp251xfd_ring_alloc()
503 priv->rx_ring_num = i; in mcp251xfd_ring_alloc()
505 hrtimer_init(&priv->rx_irq_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); in mcp251xfd_ring_alloc()
506 priv->rx_irq_timer.function = mcp251xfd_rx_irq_timer; in mcp251xfd_ring_alloc()
508 hrtimer_init(&priv->tx_irq_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); in mcp251xfd_ring_alloc()
509 priv->tx_irq_timer.function = mcp251xfd_tx_irq_timer; in mcp251xfd_ring_alloc()