Create a directory for all CAN drivers using SPI and move mcp251x driver there.
Signed-off-by: Stefano Babic <sbabic@denx.de>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Driver for TI HECC (High End CAN Controller) module found on many
TI devices. The device specifications are available from www.ti.com
-config CAN_MCP251X
- tristate "Microchip MCP251x SPI CAN controllers"
- depends on SPI && HAS_DMA
- ---help---
- Driver for the Microchip MCP251x SPI CAN controllers.
-
config CAN_BFIN
depends on BF534 || BF536 || BF537 || BF538 || BF539 || BF54x
tristate "Analog Devices Blackfin on-chip CAN"
source "drivers/net/can/cc770/Kconfig"
+source "drivers/net/can/spi/Kconfig"
+
source "drivers/net/can/usb/Kconfig"
source "drivers/net/can/softing/Kconfig"
can-dev-$(CONFIG_CAN_LEDS) += led.o
+obj-y += spi/
obj-y += usb/
obj-y += softing/
obj-$(CONFIG_CAN_CC770) += cc770/
obj-$(CONFIG_CAN_AT91) += at91_can.o
obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o
-obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
obj-$(CONFIG_CAN_BFIN) += bfin_can.o
obj-$(CONFIG_CAN_JANZ_ICAN3) += janz-ican3.o
obj-$(CONFIG_CAN_FLEXCAN) += flexcan.o
+++ /dev/null
-/*
- * CAN bus driver for Microchip 251x CAN Controller with SPI Interface
- *
- * MCP2510 support and bug fixes by Christian Pellegrin
- * <chripell@evolware.org>
- *
- * Copyright 2009 Christian Pellegrin EVOL S.r.l.
- *
- * Copyright 2007 Raymarine UK, Ltd. All Rights Reserved.
- * Written under contract by:
- * Chris Elston, Katalix Systems, Ltd.
- *
- * Based on Microchip MCP251x CAN controller driver written by
- * David Vrabel, Copyright 2006 Arcom Control Systems Ltd.
- *
- * Based on CAN bus driver for the CCAN controller written by
- * - Sascha Hauer, Marc Kleine-Budde, Pengutronix
- * - Simon Kallweit, intefo AG
- * Copyright 2007
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the version 2 of the GNU General Public License
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- *
- *
- * Your platform definition file should specify something like:
- *
- * static struct mcp251x_platform_data mcp251x_info = {
- * .oscillator_frequency = 8000000,
- * };
- *
- * static struct spi_board_info spi_board_info[] = {
- * {
- * .modalias = "mcp2510",
- * // or "mcp2515" depending on your controller
- * .platform_data = &mcp251x_info,
- * .irq = IRQ_EINT13,
- * .max_speed_hz = 2*1000*1000,
- * .chip_select = 2,
- * },
- * };
- *
- * Please see mcp251x.h for a description of the fields in
- * struct mcp251x_platform_data.
- *
- */
-
-#include <linux/can/core.h>
-#include <linux/can/dev.h>
-#include <linux/can/led.h>
-#include <linux/can/platform/mcp251x.h>
-#include <linux/clk.h>
-#include <linux/completion.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/dma-mapping.h>
-#include <linux/freezer.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/spi/spi.h>
-#include <linux/uaccess.h>
-#include <linux/regulator/consumer.h>
-
-/* SPI interface instruction set */
-#define INSTRUCTION_WRITE 0x02
-#define INSTRUCTION_READ 0x03
-#define INSTRUCTION_BIT_MODIFY 0x05
-#define INSTRUCTION_LOAD_TXB(n) (0x40 + 2 * (n))
-#define INSTRUCTION_READ_RXB(n) (((n) == 0) ? 0x90 : 0x94)
-#define INSTRUCTION_RESET 0xC0
-#define RTS_TXB0 0x01
-#define RTS_TXB1 0x02
-#define RTS_TXB2 0x04
-#define INSTRUCTION_RTS(n) (0x80 | ((n) & 0x07))
-
-
-/* MPC251x registers */
-#define CANSTAT 0x0e
-#define CANCTRL 0x0f
-# define CANCTRL_REQOP_MASK 0xe0
-# define CANCTRL_REQOP_CONF 0x80
-# define CANCTRL_REQOP_LISTEN_ONLY 0x60
-# define CANCTRL_REQOP_LOOPBACK 0x40
-# define CANCTRL_REQOP_SLEEP 0x20
-# define CANCTRL_REQOP_NORMAL 0x00
-# define CANCTRL_OSM 0x08
-# define CANCTRL_ABAT 0x10
-#define TEC 0x1c
-#define REC 0x1d
-#define CNF1 0x2a
-# define CNF1_SJW_SHIFT 6
-#define CNF2 0x29
-# define CNF2_BTLMODE 0x80
-# define CNF2_SAM 0x40
-# define CNF2_PS1_SHIFT 3
-#define CNF3 0x28
-# define CNF3_SOF 0x08
-# define CNF3_WAKFIL 0x04
-# define CNF3_PHSEG2_MASK 0x07
-#define CANINTE 0x2b
-# define CANINTE_MERRE 0x80
-# define CANINTE_WAKIE 0x40
-# define CANINTE_ERRIE 0x20
-# define CANINTE_TX2IE 0x10
-# define CANINTE_TX1IE 0x08
-# define CANINTE_TX0IE 0x04
-# define CANINTE_RX1IE 0x02
-# define CANINTE_RX0IE 0x01
-#define CANINTF 0x2c
-# define CANINTF_MERRF 0x80
-# define CANINTF_WAKIF 0x40
-# define CANINTF_ERRIF 0x20
-# define CANINTF_TX2IF 0x10
-# define CANINTF_TX1IF 0x08
-# define CANINTF_TX0IF 0x04
-# define CANINTF_RX1IF 0x02
-# define CANINTF_RX0IF 0x01
-# define CANINTF_RX (CANINTF_RX0IF | CANINTF_RX1IF)
-# define CANINTF_TX (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF)
-# define CANINTF_ERR (CANINTF_ERRIF)
-#define EFLG 0x2d
-# define EFLG_EWARN 0x01
-# define EFLG_RXWAR 0x02
-# define EFLG_TXWAR 0x04
-# define EFLG_RXEP 0x08
-# define EFLG_TXEP 0x10
-# define EFLG_TXBO 0x20
-# define EFLG_RX0OVR 0x40
-# define EFLG_RX1OVR 0x80
-#define TXBCTRL(n) (((n) * 0x10) + 0x30 + TXBCTRL_OFF)
-# define TXBCTRL_ABTF 0x40
-# define TXBCTRL_MLOA 0x20
-# define TXBCTRL_TXERR 0x10
-# define TXBCTRL_TXREQ 0x08
-#define TXBSIDH(n) (((n) * 0x10) + 0x30 + TXBSIDH_OFF)
-# define SIDH_SHIFT 3
-#define TXBSIDL(n) (((n) * 0x10) + 0x30 + TXBSIDL_OFF)
-# define SIDL_SID_MASK 7
-# define SIDL_SID_SHIFT 5
-# define SIDL_EXIDE_SHIFT 3
-# define SIDL_EID_SHIFT 16
-# define SIDL_EID_MASK 3
-#define TXBEID8(n) (((n) * 0x10) + 0x30 + TXBEID8_OFF)
-#define TXBEID0(n) (((n) * 0x10) + 0x30 + TXBEID0_OFF)
-#define TXBDLC(n) (((n) * 0x10) + 0x30 + TXBDLC_OFF)
-# define DLC_RTR_SHIFT 6
-#define TXBCTRL_OFF 0
-#define TXBSIDH_OFF 1
-#define TXBSIDL_OFF 2
-#define TXBEID8_OFF 3
-#define TXBEID0_OFF 4
-#define TXBDLC_OFF 5
-#define TXBDAT_OFF 6
-#define RXBCTRL(n) (((n) * 0x10) + 0x60 + RXBCTRL_OFF)
-# define RXBCTRL_BUKT 0x04
-# define RXBCTRL_RXM0 0x20
-# define RXBCTRL_RXM1 0x40
-#define RXBSIDH(n) (((n) * 0x10) + 0x60 + RXBSIDH_OFF)
-# define RXBSIDH_SHIFT 3
-#define RXBSIDL(n) (((n) * 0x10) + 0x60 + RXBSIDL_OFF)
-# define RXBSIDL_IDE 0x08
-# define RXBSIDL_SRR 0x10
-# define RXBSIDL_EID 3
-# define RXBSIDL_SHIFT 5
-#define RXBEID8(n) (((n) * 0x10) + 0x60 + RXBEID8_OFF)
-#define RXBEID0(n) (((n) * 0x10) + 0x60 + RXBEID0_OFF)
-#define RXBDLC(n) (((n) * 0x10) + 0x60 + RXBDLC_OFF)
-# define RXBDLC_LEN_MASK 0x0f
-# define RXBDLC_RTR 0x40
-#define RXBCTRL_OFF 0
-#define RXBSIDH_OFF 1
-#define RXBSIDL_OFF 2
-#define RXBEID8_OFF 3
-#define RXBEID0_OFF 4
-#define RXBDLC_OFF 5
-#define RXBDAT_OFF 6
-#define RXFSIDH(n) ((n) * 4)
-#define RXFSIDL(n) ((n) * 4 + 1)
-#define RXFEID8(n) ((n) * 4 + 2)
-#define RXFEID0(n) ((n) * 4 + 3)
-#define RXMSIDH(n) ((n) * 4 + 0x20)
-#define RXMSIDL(n) ((n) * 4 + 0x21)
-#define RXMEID8(n) ((n) * 4 + 0x22)
-#define RXMEID0(n) ((n) * 4 + 0x23)
-
-#define GET_BYTE(val, byte) \
- (((val) >> ((byte) * 8)) & 0xff)
-#define SET_BYTE(val, byte) \
- (((val) & 0xff) << ((byte) * 8))
-
-/*
- * Buffer size required for the largest SPI transfer (i.e., reading a
- * frame)
- */
-#define CAN_FRAME_MAX_DATA_LEN 8
-#define SPI_TRANSFER_BUF_LEN (6 + CAN_FRAME_MAX_DATA_LEN)
-#define CAN_FRAME_MAX_BITS 128
-
-#define TX_ECHO_SKB_MAX 1
-
-#define MCP251X_OST_DELAY_MS (5)
-
-#define DEVICE_NAME "mcp251x"
-
-static int mcp251x_enable_dma; /* Enable SPI DMA. Default: 0 (Off) */
-module_param(mcp251x_enable_dma, int, S_IRUGO);
-MODULE_PARM_DESC(mcp251x_enable_dma, "Enable SPI DMA. Default: 0 (Off)");
-
-static const struct can_bittiming_const mcp251x_bittiming_const = {
- .name = DEVICE_NAME,
- .tseg1_min = 3,
- .tseg1_max = 16,
- .tseg2_min = 2,
- .tseg2_max = 8,
- .sjw_max = 4,
- .brp_min = 1,
- .brp_max = 64,
- .brp_inc = 1,
-};
-
-enum mcp251x_model {
- CAN_MCP251X_MCP2510 = 0x2510,
- CAN_MCP251X_MCP2515 = 0x2515,
-};
-
-struct mcp251x_priv {
- struct can_priv can;
- struct net_device *net;
- struct spi_device *spi;
- enum mcp251x_model model;
-
- struct mutex mcp_lock; /* SPI device lock */
-
- u8 *spi_tx_buf;
- u8 *spi_rx_buf;
- dma_addr_t spi_tx_dma;
- dma_addr_t spi_rx_dma;
-
- struct sk_buff *tx_skb;
- int tx_len;
-
- struct workqueue_struct *wq;
- struct work_struct tx_work;
- struct work_struct restart_work;
-
- int force_quit;
- int after_suspend;
-#define AFTER_SUSPEND_UP 1
-#define AFTER_SUSPEND_DOWN 2
-#define AFTER_SUSPEND_POWER 4
-#define AFTER_SUSPEND_RESTART 8
- int restart_tx;
- struct regulator *power;
- struct regulator *transceiver;
- struct clk *clk;
-};
-
-#define MCP251X_IS(_model) \
-static inline int mcp251x_is_##_model(struct spi_device *spi) \
-{ \
- struct mcp251x_priv *priv = spi_get_drvdata(spi); \
- return priv->model == CAN_MCP251X_MCP##_model; \
-}
-
-MCP251X_IS(2510);
-MCP251X_IS(2515);
-
-static void mcp251x_clean(struct net_device *net)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
-
- if (priv->tx_skb || priv->tx_len)
- net->stats.tx_errors++;
- if (priv->tx_skb)
- dev_kfree_skb(priv->tx_skb);
- if (priv->tx_len)
- can_free_echo_skb(priv->net, 0);
- priv->tx_skb = NULL;
- priv->tx_len = 0;
-}
-
-/*
- * Note about handling of error return of mcp251x_spi_trans: accessing
- * registers via SPI is not really different conceptually than using
- * normal I/O assembler instructions, although it's much more
- * complicated from a practical POV. So it's not advisable to always
- * check the return value of this function. Imagine that every
- * read{b,l}, write{b,l} and friends would be bracketed in "if ( < 0)
- * error();", it would be a great mess (well there are some situation
- * when exception handling C++ like could be useful after all). So we
- * just check that transfers are OK at the beginning of our
- * conversation with the chip and to avoid doing really nasty things
- * (like injecting bogus packets in the network stack).
- */
-static int mcp251x_spi_trans(struct spi_device *spi, int len)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- struct spi_transfer t = {
- .tx_buf = priv->spi_tx_buf,
- .rx_buf = priv->spi_rx_buf,
- .len = len,
- .cs_change = 0,
- };
- struct spi_message m;
- int ret;
-
- spi_message_init(&m);
-
- if (mcp251x_enable_dma) {
- t.tx_dma = priv->spi_tx_dma;
- t.rx_dma = priv->spi_rx_dma;
- m.is_dma_mapped = 1;
- }
-
- spi_message_add_tail(&t, &m);
-
- ret = spi_sync(spi, &m);
- if (ret)
- dev_err(&spi->dev, "spi transfer failed: ret = %d\n", ret);
- return ret;
-}
-
-static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- u8 val = 0;
-
- priv->spi_tx_buf[0] = INSTRUCTION_READ;
- priv->spi_tx_buf[1] = reg;
-
- mcp251x_spi_trans(spi, 3);
- val = priv->spi_rx_buf[2];
-
- return val;
-}
-
-static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg,
- uint8_t *v1, uint8_t *v2)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
-
- priv->spi_tx_buf[0] = INSTRUCTION_READ;
- priv->spi_tx_buf[1] = reg;
-
- mcp251x_spi_trans(spi, 4);
-
- *v1 = priv->spi_rx_buf[2];
- *v2 = priv->spi_rx_buf[3];
-}
-
-static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
-
- priv->spi_tx_buf[0] = INSTRUCTION_WRITE;
- priv->spi_tx_buf[1] = reg;
- priv->spi_tx_buf[2] = val;
-
- mcp251x_spi_trans(spi, 3);
-}
-
-static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
- u8 mask, uint8_t val)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
-
- priv->spi_tx_buf[0] = INSTRUCTION_BIT_MODIFY;
- priv->spi_tx_buf[1] = reg;
- priv->spi_tx_buf[2] = mask;
- priv->spi_tx_buf[3] = val;
-
- mcp251x_spi_trans(spi, 4);
-}
-
-static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf,
- int len, int tx_buf_idx)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
-
- if (mcp251x_is_2510(spi)) {
- int i;
-
- for (i = 1; i < TXBDAT_OFF + len; i++)
- mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx) + i,
- buf[i]);
- } else {
- memcpy(priv->spi_tx_buf, buf, TXBDAT_OFF + len);
- mcp251x_spi_trans(spi, TXBDAT_OFF + len);
- }
-}
-
-static void mcp251x_hw_tx(struct spi_device *spi, struct can_frame *frame,
- int tx_buf_idx)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- u32 sid, eid, exide, rtr;
- u8 buf[SPI_TRANSFER_BUF_LEN];
-
- exide = (frame->can_id & CAN_EFF_FLAG) ? 1 : 0; /* Extended ID Enable */
- if (exide)
- sid = (frame->can_id & CAN_EFF_MASK) >> 18;
- else
- sid = frame->can_id & CAN_SFF_MASK; /* Standard ID */
- eid = frame->can_id & CAN_EFF_MASK; /* Extended ID */
- rtr = (frame->can_id & CAN_RTR_FLAG) ? 1 : 0; /* Remote transmission */
-
- buf[TXBCTRL_OFF] = INSTRUCTION_LOAD_TXB(tx_buf_idx);
- buf[TXBSIDH_OFF] = sid >> SIDH_SHIFT;
- buf[TXBSIDL_OFF] = ((sid & SIDL_SID_MASK) << SIDL_SID_SHIFT) |
- (exide << SIDL_EXIDE_SHIFT) |
- ((eid >> SIDL_EID_SHIFT) & SIDL_EID_MASK);
- buf[TXBEID8_OFF] = GET_BYTE(eid, 1);
- buf[TXBEID0_OFF] = GET_BYTE(eid, 0);
- buf[TXBDLC_OFF] = (rtr << DLC_RTR_SHIFT) | frame->can_dlc;
- memcpy(buf + TXBDAT_OFF, frame->data, frame->can_dlc);
- mcp251x_hw_tx_frame(spi, buf, frame->can_dlc, tx_buf_idx);
-
- /* use INSTRUCTION_RTS, to avoid "repeated frame problem" */
- priv->spi_tx_buf[0] = INSTRUCTION_RTS(1 << tx_buf_idx);
- mcp251x_spi_trans(priv->spi, 1);
-}
-
-static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf,
- int buf_idx)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
-
- if (mcp251x_is_2510(spi)) {
- int i, len;
-
- for (i = 1; i < RXBDAT_OFF; i++)
- buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
-
- len = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
- for (; i < (RXBDAT_OFF + len); i++)
- buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
- } else {
- priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx);
- mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN);
- memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN);
- }
-}
-
-static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- struct sk_buff *skb;
- struct can_frame *frame;
- u8 buf[SPI_TRANSFER_BUF_LEN];
-
- skb = alloc_can_skb(priv->net, &frame);
- if (!skb) {
- dev_err(&spi->dev, "cannot allocate RX skb\n");
- priv->net->stats.rx_dropped++;
- return;
- }
-
- mcp251x_hw_rx_frame(spi, buf, buf_idx);
- if (buf[RXBSIDL_OFF] & RXBSIDL_IDE) {
- /* Extended ID format */
- frame->can_id = CAN_EFF_FLAG;
- frame->can_id |=
- /* Extended ID part */
- SET_BYTE(buf[RXBSIDL_OFF] & RXBSIDL_EID, 2) |
- SET_BYTE(buf[RXBEID8_OFF], 1) |
- SET_BYTE(buf[RXBEID0_OFF], 0) |
- /* Standard ID part */
- (((buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) |
- (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT)) << 18);
- /* Remote transmission request */
- if (buf[RXBDLC_OFF] & RXBDLC_RTR)
- frame->can_id |= CAN_RTR_FLAG;
- } else {
- /* Standard ID format */
- frame->can_id =
- (buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) |
- (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT);
- if (buf[RXBSIDL_OFF] & RXBSIDL_SRR)
- frame->can_id |= CAN_RTR_FLAG;
- }
- /* Data length */
- frame->can_dlc = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
- memcpy(frame->data, buf + RXBDAT_OFF, frame->can_dlc);
-
- priv->net->stats.rx_packets++;
- priv->net->stats.rx_bytes += frame->can_dlc;
-
- can_led_event(priv->net, CAN_LED_EVENT_RX);
-
- netif_rx_ni(skb);
-}
-
-static void mcp251x_hw_sleep(struct spi_device *spi)
-{
- mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_SLEEP);
-}
-
-static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
- struct net_device *net)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
- struct spi_device *spi = priv->spi;
-
- if (priv->tx_skb || priv->tx_len) {
- dev_warn(&spi->dev, "hard_xmit called while tx busy\n");
- return NETDEV_TX_BUSY;
- }
-
- if (can_dropped_invalid_skb(net, skb))
- return NETDEV_TX_OK;
-
- netif_stop_queue(net);
- priv->tx_skb = skb;
- queue_work(priv->wq, &priv->tx_work);
-
- return NETDEV_TX_OK;
-}
-
-static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
-
- switch (mode) {
- case CAN_MODE_START:
- mcp251x_clean(net);
- /* We have to delay work since SPI I/O may sleep */
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
- priv->restart_tx = 1;
- if (priv->can.restart_ms == 0)
- priv->after_suspend = AFTER_SUSPEND_RESTART;
- queue_work(priv->wq, &priv->restart_work);
- break;
- default:
- return -EOPNOTSUPP;
- }
-
- return 0;
-}
-
-static int mcp251x_set_normal_mode(struct spi_device *spi)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- unsigned long timeout;
-
- /* Enable interrupts */
- mcp251x_write_reg(spi, CANINTE,
- CANINTE_ERRIE | CANINTE_TX2IE | CANINTE_TX1IE |
- CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE);
-
- if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
- /* Put device into loopback mode */
- mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LOOPBACK);
- } else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
- /* Put device into listen-only mode */
- mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY);
- } else {
- /* Put device into normal mode */
- mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL);
-
- /* Wait for the device to enter normal mode */
- timeout = jiffies + HZ;
- while (mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) {
- schedule();
- if (time_after(jiffies, timeout)) {
- dev_err(&spi->dev, "MCP251x didn't"
- " enter in normal mode\n");
- return -EBUSY;
- }
- }
- }
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
- return 0;
-}
-
-static int mcp251x_do_set_bittiming(struct net_device *net)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
- struct can_bittiming *bt = &priv->can.bittiming;
- struct spi_device *spi = priv->spi;
-
- mcp251x_write_reg(spi, CNF1, ((bt->sjw - 1) << CNF1_SJW_SHIFT) |
- (bt->brp - 1));
- mcp251x_write_reg(spi, CNF2, CNF2_BTLMODE |
- (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES ?
- CNF2_SAM : 0) |
- ((bt->phase_seg1 - 1) << CNF2_PS1_SHIFT) |
- (bt->prop_seg - 1));
- mcp251x_write_bits(spi, CNF3, CNF3_PHSEG2_MASK,
- (bt->phase_seg2 - 1));
- dev_dbg(&spi->dev, "CNF: 0x%02x 0x%02x 0x%02x\n",
- mcp251x_read_reg(spi, CNF1),
- mcp251x_read_reg(spi, CNF2),
- mcp251x_read_reg(spi, CNF3));
-
- return 0;
-}
-
-static int mcp251x_setup(struct net_device *net, struct mcp251x_priv *priv,
- struct spi_device *spi)
-{
- mcp251x_do_set_bittiming(net);
-
- mcp251x_write_reg(spi, RXBCTRL(0),
- RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1);
- mcp251x_write_reg(spi, RXBCTRL(1),
- RXBCTRL_RXM0 | RXBCTRL_RXM1);
- return 0;
-}
-
-static int mcp251x_hw_reset(struct spi_device *spi)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- u8 reg;
- int ret;
-
- /* Wait for oscillator startup timer after power up */
- mdelay(MCP251X_OST_DELAY_MS);
-
- priv->spi_tx_buf[0] = INSTRUCTION_RESET;
- ret = mcp251x_spi_trans(spi, 1);
- if (ret)
- return ret;
-
- /* Wait for oscillator startup timer after reset */
- mdelay(MCP251X_OST_DELAY_MS);
-
- reg = mcp251x_read_reg(spi, CANSTAT);
- if ((reg & CANCTRL_REQOP_MASK) != CANCTRL_REQOP_CONF)
- return -ENODEV;
-
- return 0;
-}
-
-static int mcp251x_hw_probe(struct spi_device *spi)
-{
- u8 ctrl;
- int ret;
-
- ret = mcp251x_hw_reset(spi);
- if (ret)
- return ret;
-
- ctrl = mcp251x_read_reg(spi, CANCTRL);
-
- dev_dbg(&spi->dev, "CANCTRL 0x%02x\n", ctrl);
-
- /* Check for power up default value */
- if ((ctrl & 0x17) != 0x07)
- return -ENODEV;
-
- return 0;
-}
-
-static int mcp251x_power_enable(struct regulator *reg, int enable)
-{
- if (IS_ERR_OR_NULL(reg))
- return 0;
-
- if (enable)
- return regulator_enable(reg);
- else
- return regulator_disable(reg);
-}
-
-static void mcp251x_open_clean(struct net_device *net)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
- struct spi_device *spi = priv->spi;
-
- free_irq(spi->irq, priv);
- mcp251x_hw_sleep(spi);
- mcp251x_power_enable(priv->transceiver, 0);
- close_candev(net);
-}
-
-static int mcp251x_stop(struct net_device *net)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
- struct spi_device *spi = priv->spi;
-
- close_candev(net);
-
- priv->force_quit = 1;
- free_irq(spi->irq, priv);
- destroy_workqueue(priv->wq);
- priv->wq = NULL;
-
- mutex_lock(&priv->mcp_lock);
-
- /* Disable and clear pending interrupts */
- mcp251x_write_reg(spi, CANINTE, 0x00);
- mcp251x_write_reg(spi, CANINTF, 0x00);
-
- mcp251x_write_reg(spi, TXBCTRL(0), 0);
- mcp251x_clean(net);
-
- mcp251x_hw_sleep(spi);
-
- mcp251x_power_enable(priv->transceiver, 0);
-
- priv->can.state = CAN_STATE_STOPPED;
-
- mutex_unlock(&priv->mcp_lock);
-
- can_led_event(net, CAN_LED_EVENT_STOP);
-
- return 0;
-}
-
-static void mcp251x_error_skb(struct net_device *net, int can_id, int data1)
-{
- struct sk_buff *skb;
- struct can_frame *frame;
-
- skb = alloc_can_err_skb(net, &frame);
- if (skb) {
- frame->can_id |= can_id;
- frame->data[1] = data1;
- netif_rx_ni(skb);
- } else {
- netdev_err(net, "cannot allocate error skb\n");
- }
-}
-
-static void mcp251x_tx_work_handler(struct work_struct *ws)
-{
- struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
- tx_work);
- struct spi_device *spi = priv->spi;
- struct net_device *net = priv->net;
- struct can_frame *frame;
-
- mutex_lock(&priv->mcp_lock);
- if (priv->tx_skb) {
- if (priv->can.state == CAN_STATE_BUS_OFF) {
- mcp251x_clean(net);
- } else {
- frame = (struct can_frame *)priv->tx_skb->data;
-
- if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN)
- frame->can_dlc = CAN_FRAME_MAX_DATA_LEN;
- mcp251x_hw_tx(spi, frame, 0);
- priv->tx_len = 1 + frame->can_dlc;
- can_put_echo_skb(priv->tx_skb, net, 0);
- priv->tx_skb = NULL;
- }
- }
- mutex_unlock(&priv->mcp_lock);
-}
-
-static void mcp251x_restart_work_handler(struct work_struct *ws)
-{
- struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
- restart_work);
- struct spi_device *spi = priv->spi;
- struct net_device *net = priv->net;
-
- mutex_lock(&priv->mcp_lock);
- if (priv->after_suspend) {
- mcp251x_hw_reset(spi);
- mcp251x_setup(net, priv, spi);
- if (priv->after_suspend & AFTER_SUSPEND_RESTART) {
- mcp251x_set_normal_mode(spi);
- } else if (priv->after_suspend & AFTER_SUSPEND_UP) {
- netif_device_attach(net);
- mcp251x_clean(net);
- mcp251x_set_normal_mode(spi);
- netif_wake_queue(net);
- } else {
- mcp251x_hw_sleep(spi);
- }
- priv->after_suspend = 0;
- priv->force_quit = 0;
- }
-
- if (priv->restart_tx) {
- priv->restart_tx = 0;
- mcp251x_write_reg(spi, TXBCTRL(0), 0);
- mcp251x_clean(net);
- netif_wake_queue(net);
- mcp251x_error_skb(net, CAN_ERR_RESTARTED, 0);
- }
- mutex_unlock(&priv->mcp_lock);
-}
-
-static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
-{
- struct mcp251x_priv *priv = dev_id;
- struct spi_device *spi = priv->spi;
- struct net_device *net = priv->net;
-
- mutex_lock(&priv->mcp_lock);
- while (!priv->force_quit) {
- enum can_state new_state;
- u8 intf, eflag;
- u8 clear_intf = 0;
- int can_id = 0, data1 = 0;
-
- mcp251x_read_2regs(spi, CANINTF, &intf, &eflag);
-
- /* mask out flags we don't care about */
- intf &= CANINTF_RX | CANINTF_TX | CANINTF_ERR;
-
- /* receive buffer 0 */
- if (intf & CANINTF_RX0IF) {
- mcp251x_hw_rx(spi, 0);
- /*
- * Free one buffer ASAP
- * (The MCP2515 does this automatically.)
- */
- if (mcp251x_is_2510(spi))
- mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00);
- }
-
- /* receive buffer 1 */
- if (intf & CANINTF_RX1IF) {
- mcp251x_hw_rx(spi, 1);
- /* the MCP2515 does this automatically */
- if (mcp251x_is_2510(spi))
- clear_intf |= CANINTF_RX1IF;
- }
-
- /* any error or tx interrupt we need to clear? */
- if (intf & (CANINTF_ERR | CANINTF_TX))
- clear_intf |= intf & (CANINTF_ERR | CANINTF_TX);
- if (clear_intf)
- mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00);
-
- if (eflag)
- mcp251x_write_bits(spi, EFLG, eflag, 0x00);
-
- /* Update can state */
- if (eflag & EFLG_TXBO) {
- new_state = CAN_STATE_BUS_OFF;
- can_id |= CAN_ERR_BUSOFF;
- } else if (eflag & EFLG_TXEP) {
- new_state = CAN_STATE_ERROR_PASSIVE;
- can_id |= CAN_ERR_CRTL;
- data1 |= CAN_ERR_CRTL_TX_PASSIVE;
- } else if (eflag & EFLG_RXEP) {
- new_state = CAN_STATE_ERROR_PASSIVE;
- can_id |= CAN_ERR_CRTL;
- data1 |= CAN_ERR_CRTL_RX_PASSIVE;
- } else if (eflag & EFLG_TXWAR) {
- new_state = CAN_STATE_ERROR_WARNING;
- can_id |= CAN_ERR_CRTL;
- data1 |= CAN_ERR_CRTL_TX_WARNING;
- } else if (eflag & EFLG_RXWAR) {
- new_state = CAN_STATE_ERROR_WARNING;
- can_id |= CAN_ERR_CRTL;
- data1 |= CAN_ERR_CRTL_RX_WARNING;
- } else {
- new_state = CAN_STATE_ERROR_ACTIVE;
- }
-
- /* Update can state statistics */
- switch (priv->can.state) {
- case CAN_STATE_ERROR_ACTIVE:
- if (new_state >= CAN_STATE_ERROR_WARNING &&
- new_state <= CAN_STATE_BUS_OFF)
- priv->can.can_stats.error_warning++;
- case CAN_STATE_ERROR_WARNING: /* fallthrough */
- if (new_state >= CAN_STATE_ERROR_PASSIVE &&
- new_state <= CAN_STATE_BUS_OFF)
- priv->can.can_stats.error_passive++;
- break;
- default:
- break;
- }
- priv->can.state = new_state;
-
- if (intf & CANINTF_ERRIF) {
- /* Handle overflow counters */
- if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) {
- if (eflag & EFLG_RX0OVR) {
- net->stats.rx_over_errors++;
- net->stats.rx_errors++;
- }
- if (eflag & EFLG_RX1OVR) {
- net->stats.rx_over_errors++;
- net->stats.rx_errors++;
- }
- can_id |= CAN_ERR_CRTL;
- data1 |= CAN_ERR_CRTL_RX_OVERFLOW;
- }
- mcp251x_error_skb(net, can_id, data1);
- }
-
- if (priv->can.state == CAN_STATE_BUS_OFF) {
- if (priv->can.restart_ms == 0) {
- priv->force_quit = 1;
- can_bus_off(net);
- mcp251x_hw_sleep(spi);
- break;
- }
- }
-
- if (intf == 0)
- break;
-
- if (intf & CANINTF_TX) {
- net->stats.tx_packets++;
- net->stats.tx_bytes += priv->tx_len - 1;
- can_led_event(net, CAN_LED_EVENT_TX);
- if (priv->tx_len) {
- can_get_echo_skb(net, 0);
- priv->tx_len = 0;
- }
- netif_wake_queue(net);
- }
-
- }
- mutex_unlock(&priv->mcp_lock);
- return IRQ_HANDLED;
-}
-
-static int mcp251x_open(struct net_device *net)
-{
- struct mcp251x_priv *priv = netdev_priv(net);
- struct spi_device *spi = priv->spi;
- unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_FALLING;
- int ret;
-
- ret = open_candev(net);
- if (ret) {
- dev_err(&spi->dev, "unable to set initial baudrate!\n");
- return ret;
- }
-
- mutex_lock(&priv->mcp_lock);
- mcp251x_power_enable(priv->transceiver, 1);
-
- priv->force_quit = 0;
- priv->tx_skb = NULL;
- priv->tx_len = 0;
-
- ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist,
- flags, DEVICE_NAME, priv);
- if (ret) {
- dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
- mcp251x_power_enable(priv->transceiver, 0);
- close_candev(net);
- goto open_unlock;
- }
-
- priv->wq = create_freezable_workqueue("mcp251x_wq");
- INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
- INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler);
-
- ret = mcp251x_hw_reset(spi);
- if (ret) {
- mcp251x_open_clean(net);
- goto open_unlock;
- }
- ret = mcp251x_setup(net, priv, spi);
- if (ret) {
- mcp251x_open_clean(net);
- goto open_unlock;
- }
- ret = mcp251x_set_normal_mode(spi);
- if (ret) {
- mcp251x_open_clean(net);
- goto open_unlock;
- }
-
- can_led_event(net, CAN_LED_EVENT_OPEN);
-
- netif_wake_queue(net);
-
-open_unlock:
- mutex_unlock(&priv->mcp_lock);
- return ret;
-}
-
-static const struct net_device_ops mcp251x_netdev_ops = {
- .ndo_open = mcp251x_open,
- .ndo_stop = mcp251x_stop,
- .ndo_start_xmit = mcp251x_hard_start_xmit,
- .ndo_change_mtu = can_change_mtu,
-};
-
-static const struct of_device_id mcp251x_of_match[] = {
- {
- .compatible = "microchip,mcp2510",
- .data = (void *)CAN_MCP251X_MCP2510,
- },
- {
- .compatible = "microchip,mcp2515",
- .data = (void *)CAN_MCP251X_MCP2515,
- },
- { }
-};
-MODULE_DEVICE_TABLE(of, mcp251x_of_match);
-
-static const struct spi_device_id mcp251x_id_table[] = {
- {
- .name = "mcp2510",
- .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2510,
- },
- {
- .name = "mcp2515",
- .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2515,
- },
- { }
-};
-MODULE_DEVICE_TABLE(spi, mcp251x_id_table);
-
-static int mcp251x_can_probe(struct spi_device *spi)
-{
- const struct of_device_id *of_id = of_match_device(mcp251x_of_match,
- &spi->dev);
- struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev);
- struct net_device *net;
- struct mcp251x_priv *priv;
- struct clk *clk;
- int freq, ret;
-
- clk = devm_clk_get(&spi->dev, NULL);
- if (IS_ERR(clk)) {
- if (pdata)
- freq = pdata->oscillator_frequency;
- else
- return PTR_ERR(clk);
- } else {
- freq = clk_get_rate(clk);
- }
-
- /* Sanity check */
- if (freq < 1000000 || freq > 25000000)
- return -ERANGE;
-
- /* Allocate can/net device */
- net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX);
- if (!net)
- return -ENOMEM;
-
- if (!IS_ERR(clk)) {
- ret = clk_prepare_enable(clk);
- if (ret)
- goto out_free;
- }
-
- net->netdev_ops = &mcp251x_netdev_ops;
- net->flags |= IFF_ECHO;
-
- priv = netdev_priv(net);
- priv->can.bittiming_const = &mcp251x_bittiming_const;
- priv->can.do_set_mode = mcp251x_do_set_mode;
- priv->can.clock.freq = freq / 2;
- priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
- CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
- if (of_id)
- priv->model = (enum mcp251x_model)of_id->data;
- else
- priv->model = spi_get_device_id(spi)->driver_data;
- priv->net = net;
- priv->clk = clk;
-
- spi_set_drvdata(spi, priv);
-
- /* Configure the SPI bus */
- spi->bits_per_word = 8;
- if (mcp251x_is_2510(spi))
- spi->max_speed_hz = spi->max_speed_hz ? : 5 * 1000 * 1000;
- else
- spi->max_speed_hz = spi->max_speed_hz ? : 10 * 1000 * 1000;
- ret = spi_setup(spi);
- if (ret)
- goto out_clk;
-
- priv->power = devm_regulator_get(&spi->dev, "vdd");
- priv->transceiver = devm_regulator_get(&spi->dev, "xceiver");
- if ((PTR_ERR(priv->power) == -EPROBE_DEFER) ||
- (PTR_ERR(priv->transceiver) == -EPROBE_DEFER)) {
- ret = -EPROBE_DEFER;
- goto out_clk;
- }
-
- ret = mcp251x_power_enable(priv->power, 1);
- if (ret)
- goto out_clk;
-
- priv->spi = spi;
- mutex_init(&priv->mcp_lock);
-
- /* If requested, allocate DMA buffers */
- if (mcp251x_enable_dma) {
- spi->dev.coherent_dma_mask = ~0;
-
- /*
- * Minimum coherent DMA allocation is PAGE_SIZE, so allocate
- * that much and share it between Tx and Rx DMA buffers.
- */
- priv->spi_tx_buf = dma_alloc_coherent(&spi->dev,
- PAGE_SIZE,
- &priv->spi_tx_dma,
- GFP_DMA);
-
- if (priv->spi_tx_buf) {
- priv->spi_rx_buf = (priv->spi_tx_buf + (PAGE_SIZE / 2));
- priv->spi_rx_dma = (dma_addr_t)(priv->spi_tx_dma +
- (PAGE_SIZE / 2));
- } else {
- /* Fall back to non-DMA */
- mcp251x_enable_dma = 0;
- }
- }
-
- /* Allocate non-DMA buffers */
- if (!mcp251x_enable_dma) {
- priv->spi_tx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
- GFP_KERNEL);
- if (!priv->spi_tx_buf) {
- ret = -ENOMEM;
- goto error_probe;
- }
- priv->spi_rx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
- GFP_KERNEL);
- if (!priv->spi_rx_buf) {
- ret = -ENOMEM;
- goto error_probe;
- }
- }
-
- SET_NETDEV_DEV(net, &spi->dev);
-
- /* Here is OK to not lock the MCP, no one knows about it yet */
- ret = mcp251x_hw_probe(spi);
- if (ret)
- goto error_probe;
-
- mcp251x_hw_sleep(spi);
-
- ret = register_candev(net);
- if (ret)
- goto error_probe;
-
- devm_can_led_init(net);
-
- return 0;
-
-error_probe:
- if (mcp251x_enable_dma)
- dma_free_coherent(&spi->dev, PAGE_SIZE,
- priv->spi_tx_buf, priv->spi_tx_dma);
- mcp251x_power_enable(priv->power, 0);
-
-out_clk:
- if (!IS_ERR(clk))
- clk_disable_unprepare(clk);
-
-out_free:
- free_candev(net);
-
- return ret;
-}
-
-static int mcp251x_can_remove(struct spi_device *spi)
-{
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- struct net_device *net = priv->net;
-
- unregister_candev(net);
-
- if (mcp251x_enable_dma) {
- dma_free_coherent(&spi->dev, PAGE_SIZE,
- priv->spi_tx_buf, priv->spi_tx_dma);
- }
-
- mcp251x_power_enable(priv->power, 0);
-
- if (!IS_ERR(priv->clk))
- clk_disable_unprepare(priv->clk);
-
- free_candev(net);
-
- return 0;
-}
-
-static int __maybe_unused mcp251x_can_suspend(struct device *dev)
-{
- struct spi_device *spi = to_spi_device(dev);
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
- struct net_device *net = priv->net;
-
- priv->force_quit = 1;
- disable_irq(spi->irq);
- /*
- * Note: at this point neither IST nor workqueues are running.
- * open/stop cannot be called anyway so locking is not needed
- */
- if (netif_running(net)) {
- netif_device_detach(net);
-
- mcp251x_hw_sleep(spi);
- mcp251x_power_enable(priv->transceiver, 0);
- priv->after_suspend = AFTER_SUSPEND_UP;
- } else {
- priv->after_suspend = AFTER_SUSPEND_DOWN;
- }
-
- if (!IS_ERR_OR_NULL(priv->power)) {
- regulator_disable(priv->power);
- priv->after_suspend |= AFTER_SUSPEND_POWER;
- }
-
- return 0;
-}
-
-static int __maybe_unused mcp251x_can_resume(struct device *dev)
-{
- struct spi_device *spi = to_spi_device(dev);
- struct mcp251x_priv *priv = spi_get_drvdata(spi);
-
- if (priv->after_suspend & AFTER_SUSPEND_POWER) {
- mcp251x_power_enable(priv->power, 1);
- queue_work(priv->wq, &priv->restart_work);
- } else {
- if (priv->after_suspend & AFTER_SUSPEND_UP) {
- mcp251x_power_enable(priv->transceiver, 1);
- queue_work(priv->wq, &priv->restart_work);
- } else {
- priv->after_suspend = 0;
- }
- }
- priv->force_quit = 0;
- enable_irq(spi->irq);
- return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(mcp251x_can_pm_ops, mcp251x_can_suspend,
- mcp251x_can_resume);
-
-static struct spi_driver mcp251x_can_driver = {
- .driver = {
- .name = DEVICE_NAME,
- .owner = THIS_MODULE,
- .of_match_table = mcp251x_of_match,
- .pm = &mcp251x_can_pm_ops,
- },
- .id_table = mcp251x_id_table,
- .probe = mcp251x_can_probe,
- .remove = mcp251x_can_remove,
-};
-module_spi_driver(mcp251x_can_driver);
-
-MODULE_AUTHOR("Chris Elston <celston@katalix.com>, "
- "Christian Pellegrin <chripell@evolware.org>");
-MODULE_DESCRIPTION("Microchip 251x CAN driver");
-MODULE_LICENSE("GPL v2");
--- /dev/null
+menu "CAN SPI interfaces"
+ depends on SPI
+
+config CAN_MCP251X
+ tristate "Microchip MCP251x SPI CAN controllers"
+ depends on HAS_DMA
+ ---help---
+ Driver for the Microchip MCP251x SPI CAN controllers.
+
+endmenu
--- /dev/null
+#
+# Makefile for the Linux Controller Area Network SPI drivers.
+#
+
+
+obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
+
+ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
--- /dev/null
+/*
+ * CAN bus driver for Microchip 251x CAN Controller with SPI Interface
+ *
+ * MCP2510 support and bug fixes by Christian Pellegrin
+ * <chripell@evolware.org>
+ *
+ * Copyright 2009 Christian Pellegrin EVOL S.r.l.
+ *
+ * Copyright 2007 Raymarine UK, Ltd. All Rights Reserved.
+ * Written under contract by:
+ * Chris Elston, Katalix Systems, Ltd.
+ *
+ * Based on Microchip MCP251x CAN controller driver written by
+ * David Vrabel, Copyright 2006 Arcom Control Systems Ltd.
+ *
+ * Based on CAN bus driver for the CCAN controller written by
+ * - Sascha Hauer, Marc Kleine-Budde, Pengutronix
+ * - Simon Kallweit, intefo AG
+ * Copyright 2007
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ *
+ * Your platform definition file should specify something like:
+ *
+ * static struct mcp251x_platform_data mcp251x_info = {
+ * .oscillator_frequency = 8000000,
+ * };
+ *
+ * static struct spi_board_info spi_board_info[] = {
+ * {
+ * .modalias = "mcp2510",
+ * // or "mcp2515" depending on your controller
+ * .platform_data = &mcp251x_info,
+ * .irq = IRQ_EINT13,
+ * .max_speed_hz = 2*1000*1000,
+ * .chip_select = 2,
+ * },
+ * };
+ *
+ * Please see mcp251x.h for a description of the fields in
+ * struct mcp251x_platform_data.
+ *
+ */
+
+#include <linux/can/core.h>
+#include <linux/can/dev.h>
+#include <linux/can/led.h>
+#include <linux/can/platform/mcp251x.h>
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/freezer.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/uaccess.h>
+#include <linux/regulator/consumer.h>
+
+/* SPI interface instruction set */
+#define INSTRUCTION_WRITE 0x02
+#define INSTRUCTION_READ 0x03
+#define INSTRUCTION_BIT_MODIFY 0x05
+#define INSTRUCTION_LOAD_TXB(n) (0x40 + 2 * (n))
+#define INSTRUCTION_READ_RXB(n) (((n) == 0) ? 0x90 : 0x94)
+#define INSTRUCTION_RESET 0xC0
+#define RTS_TXB0 0x01
+#define RTS_TXB1 0x02
+#define RTS_TXB2 0x04
+#define INSTRUCTION_RTS(n) (0x80 | ((n) & 0x07))
+
+
+/* MPC251x registers */
+#define CANSTAT 0x0e
+#define CANCTRL 0x0f
+# define CANCTRL_REQOP_MASK 0xe0
+# define CANCTRL_REQOP_CONF 0x80
+# define CANCTRL_REQOP_LISTEN_ONLY 0x60
+# define CANCTRL_REQOP_LOOPBACK 0x40
+# define CANCTRL_REQOP_SLEEP 0x20
+# define CANCTRL_REQOP_NORMAL 0x00
+# define CANCTRL_OSM 0x08
+# define CANCTRL_ABAT 0x10
+#define TEC 0x1c
+#define REC 0x1d
+#define CNF1 0x2a
+# define CNF1_SJW_SHIFT 6
+#define CNF2 0x29
+# define CNF2_BTLMODE 0x80
+# define CNF2_SAM 0x40
+# define CNF2_PS1_SHIFT 3
+#define CNF3 0x28
+# define CNF3_SOF 0x08
+# define CNF3_WAKFIL 0x04
+# define CNF3_PHSEG2_MASK 0x07
+#define CANINTE 0x2b
+# define CANINTE_MERRE 0x80
+# define CANINTE_WAKIE 0x40
+# define CANINTE_ERRIE 0x20
+# define CANINTE_TX2IE 0x10
+# define CANINTE_TX1IE 0x08
+# define CANINTE_TX0IE 0x04
+# define CANINTE_RX1IE 0x02
+# define CANINTE_RX0IE 0x01
+#define CANINTF 0x2c
+# define CANINTF_MERRF 0x80
+# define CANINTF_WAKIF 0x40
+# define CANINTF_ERRIF 0x20
+# define CANINTF_TX2IF 0x10
+# define CANINTF_TX1IF 0x08
+# define CANINTF_TX0IF 0x04
+# define CANINTF_RX1IF 0x02
+# define CANINTF_RX0IF 0x01
+# define CANINTF_RX (CANINTF_RX0IF | CANINTF_RX1IF)
+# define CANINTF_TX (CANINTF_TX2IF | CANINTF_TX1IF | CANINTF_TX0IF)
+# define CANINTF_ERR (CANINTF_ERRIF)
+#define EFLG 0x2d
+# define EFLG_EWARN 0x01
+# define EFLG_RXWAR 0x02
+# define EFLG_TXWAR 0x04
+# define EFLG_RXEP 0x08
+# define EFLG_TXEP 0x10
+# define EFLG_TXBO 0x20
+# define EFLG_RX0OVR 0x40
+# define EFLG_RX1OVR 0x80
+#define TXBCTRL(n) (((n) * 0x10) + 0x30 + TXBCTRL_OFF)
+# define TXBCTRL_ABTF 0x40
+# define TXBCTRL_MLOA 0x20
+# define TXBCTRL_TXERR 0x10
+# define TXBCTRL_TXREQ 0x08
+#define TXBSIDH(n) (((n) * 0x10) + 0x30 + TXBSIDH_OFF)
+# define SIDH_SHIFT 3
+#define TXBSIDL(n) (((n) * 0x10) + 0x30 + TXBSIDL_OFF)
+# define SIDL_SID_MASK 7
+# define SIDL_SID_SHIFT 5
+# define SIDL_EXIDE_SHIFT 3
+# define SIDL_EID_SHIFT 16
+# define SIDL_EID_MASK 3
+#define TXBEID8(n) (((n) * 0x10) + 0x30 + TXBEID8_OFF)
+#define TXBEID0(n) (((n) * 0x10) + 0x30 + TXBEID0_OFF)
+#define TXBDLC(n) (((n) * 0x10) + 0x30 + TXBDLC_OFF)
+# define DLC_RTR_SHIFT 6
+#define TXBCTRL_OFF 0
+#define TXBSIDH_OFF 1
+#define TXBSIDL_OFF 2
+#define TXBEID8_OFF 3
+#define TXBEID0_OFF 4
+#define TXBDLC_OFF 5
+#define TXBDAT_OFF 6
+#define RXBCTRL(n) (((n) * 0x10) + 0x60 + RXBCTRL_OFF)
+# define RXBCTRL_BUKT 0x04
+# define RXBCTRL_RXM0 0x20
+# define RXBCTRL_RXM1 0x40
+#define RXBSIDH(n) (((n) * 0x10) + 0x60 + RXBSIDH_OFF)
+# define RXBSIDH_SHIFT 3
+#define RXBSIDL(n) (((n) * 0x10) + 0x60 + RXBSIDL_OFF)
+# define RXBSIDL_IDE 0x08
+# define RXBSIDL_SRR 0x10
+# define RXBSIDL_EID 3
+# define RXBSIDL_SHIFT 5
+#define RXBEID8(n) (((n) * 0x10) + 0x60 + RXBEID8_OFF)
+#define RXBEID0(n) (((n) * 0x10) + 0x60 + RXBEID0_OFF)
+#define RXBDLC(n) (((n) * 0x10) + 0x60 + RXBDLC_OFF)
+# define RXBDLC_LEN_MASK 0x0f
+# define RXBDLC_RTR 0x40
+#define RXBCTRL_OFF 0
+#define RXBSIDH_OFF 1
+#define RXBSIDL_OFF 2
+#define RXBEID8_OFF 3
+#define RXBEID0_OFF 4
+#define RXBDLC_OFF 5
+#define RXBDAT_OFF 6
+#define RXFSIDH(n) ((n) * 4)
+#define RXFSIDL(n) ((n) * 4 + 1)
+#define RXFEID8(n) ((n) * 4 + 2)
+#define RXFEID0(n) ((n) * 4 + 3)
+#define RXMSIDH(n) ((n) * 4 + 0x20)
+#define RXMSIDL(n) ((n) * 4 + 0x21)
+#define RXMEID8(n) ((n) * 4 + 0x22)
+#define RXMEID0(n) ((n) * 4 + 0x23)
+
+#define GET_BYTE(val, byte) \
+ (((val) >> ((byte) * 8)) & 0xff)
+#define SET_BYTE(val, byte) \
+ (((val) & 0xff) << ((byte) * 8))
+
+/*
+ * Buffer size required for the largest SPI transfer (i.e., reading a
+ * frame)
+ */
+#define CAN_FRAME_MAX_DATA_LEN 8
+#define SPI_TRANSFER_BUF_LEN (6 + CAN_FRAME_MAX_DATA_LEN)
+#define CAN_FRAME_MAX_BITS 128
+
+#define TX_ECHO_SKB_MAX 1
+
+#define MCP251X_OST_DELAY_MS (5)
+
+#define DEVICE_NAME "mcp251x"
+
+static int mcp251x_enable_dma; /* Enable SPI DMA. Default: 0 (Off) */
+module_param(mcp251x_enable_dma, int, S_IRUGO);
+MODULE_PARM_DESC(mcp251x_enable_dma, "Enable SPI DMA. Default: 0 (Off)");
+
+static const struct can_bittiming_const mcp251x_bittiming_const = {
+ .name = DEVICE_NAME,
+ .tseg1_min = 3,
+ .tseg1_max = 16,
+ .tseg2_min = 2,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+};
+
+enum mcp251x_model {
+ CAN_MCP251X_MCP2510 = 0x2510,
+ CAN_MCP251X_MCP2515 = 0x2515,
+};
+
+struct mcp251x_priv {
+ struct can_priv can;
+ struct net_device *net;
+ struct spi_device *spi;
+ enum mcp251x_model model;
+
+ struct mutex mcp_lock; /* SPI device lock */
+
+ u8 *spi_tx_buf;
+ u8 *spi_rx_buf;
+ dma_addr_t spi_tx_dma;
+ dma_addr_t spi_rx_dma;
+
+ struct sk_buff *tx_skb;
+ int tx_len;
+
+ struct workqueue_struct *wq;
+ struct work_struct tx_work;
+ struct work_struct restart_work;
+
+ int force_quit;
+ int after_suspend;
+#define AFTER_SUSPEND_UP 1
+#define AFTER_SUSPEND_DOWN 2
+#define AFTER_SUSPEND_POWER 4
+#define AFTER_SUSPEND_RESTART 8
+ int restart_tx;
+ struct regulator *power;
+ struct regulator *transceiver;
+ struct clk *clk;
+};
+
+#define MCP251X_IS(_model) \
+static inline int mcp251x_is_##_model(struct spi_device *spi) \
+{ \
+ struct mcp251x_priv *priv = spi_get_drvdata(spi); \
+ return priv->model == CAN_MCP251X_MCP##_model; \
+}
+
+MCP251X_IS(2510);
+MCP251X_IS(2515);
+
+static void mcp251x_clean(struct net_device *net)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+
+ if (priv->tx_skb || priv->tx_len)
+ net->stats.tx_errors++;
+ if (priv->tx_skb)
+ dev_kfree_skb(priv->tx_skb);
+ if (priv->tx_len)
+ can_free_echo_skb(priv->net, 0);
+ priv->tx_skb = NULL;
+ priv->tx_len = 0;
+}
+
+/*
+ * Note about handling of error return of mcp251x_spi_trans: accessing
+ * registers via SPI is not really different conceptually than using
+ * normal I/O assembler instructions, although it's much more
+ * complicated from a practical POV. So it's not advisable to always
+ * check the return value of this function. Imagine that every
+ * read{b,l}, write{b,l} and friends would be bracketed in "if ( < 0)
+ * error();", it would be a great mess (well there are some situation
+ * when exception handling C++ like could be useful after all). So we
+ * just check that transfers are OK at the beginning of our
+ * conversation with the chip and to avoid doing really nasty things
+ * (like injecting bogus packets in the network stack).
+ */
+static int mcp251x_spi_trans(struct spi_device *spi, int len)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ struct spi_transfer t = {
+ .tx_buf = priv->spi_tx_buf,
+ .rx_buf = priv->spi_rx_buf,
+ .len = len,
+ .cs_change = 0,
+ };
+ struct spi_message m;
+ int ret;
+
+ spi_message_init(&m);
+
+ if (mcp251x_enable_dma) {
+ t.tx_dma = priv->spi_tx_dma;
+ t.rx_dma = priv->spi_rx_dma;
+ m.is_dma_mapped = 1;
+ }
+
+ spi_message_add_tail(&t, &m);
+
+ ret = spi_sync(spi, &m);
+ if (ret)
+ dev_err(&spi->dev, "spi transfer failed: ret = %d\n", ret);
+ return ret;
+}
+
+static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ u8 val = 0;
+
+ priv->spi_tx_buf[0] = INSTRUCTION_READ;
+ priv->spi_tx_buf[1] = reg;
+
+ mcp251x_spi_trans(spi, 3);
+ val = priv->spi_rx_buf[2];
+
+ return val;
+}
+
+static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg,
+ uint8_t *v1, uint8_t *v2)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ priv->spi_tx_buf[0] = INSTRUCTION_READ;
+ priv->spi_tx_buf[1] = reg;
+
+ mcp251x_spi_trans(spi, 4);
+
+ *v1 = priv->spi_rx_buf[2];
+ *v2 = priv->spi_rx_buf[3];
+}
+
+static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ priv->spi_tx_buf[0] = INSTRUCTION_WRITE;
+ priv->spi_tx_buf[1] = reg;
+ priv->spi_tx_buf[2] = val;
+
+ mcp251x_spi_trans(spi, 3);
+}
+
+static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
+ u8 mask, uint8_t val)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ priv->spi_tx_buf[0] = INSTRUCTION_BIT_MODIFY;
+ priv->spi_tx_buf[1] = reg;
+ priv->spi_tx_buf[2] = mask;
+ priv->spi_tx_buf[3] = val;
+
+ mcp251x_spi_trans(spi, 4);
+}
+
+static void mcp251x_hw_tx_frame(struct spi_device *spi, u8 *buf,
+ int len, int tx_buf_idx)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ if (mcp251x_is_2510(spi)) {
+ int i;
+
+ for (i = 1; i < TXBDAT_OFF + len; i++)
+ mcp251x_write_reg(spi, TXBCTRL(tx_buf_idx) + i,
+ buf[i]);
+ } else {
+ memcpy(priv->spi_tx_buf, buf, TXBDAT_OFF + len);
+ mcp251x_spi_trans(spi, TXBDAT_OFF + len);
+ }
+}
+
+static void mcp251x_hw_tx(struct spi_device *spi, struct can_frame *frame,
+ int tx_buf_idx)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ u32 sid, eid, exide, rtr;
+ u8 buf[SPI_TRANSFER_BUF_LEN];
+
+ exide = (frame->can_id & CAN_EFF_FLAG) ? 1 : 0; /* Extended ID Enable */
+ if (exide)
+ sid = (frame->can_id & CAN_EFF_MASK) >> 18;
+ else
+ sid = frame->can_id & CAN_SFF_MASK; /* Standard ID */
+ eid = frame->can_id & CAN_EFF_MASK; /* Extended ID */
+ rtr = (frame->can_id & CAN_RTR_FLAG) ? 1 : 0; /* Remote transmission */
+
+ buf[TXBCTRL_OFF] = INSTRUCTION_LOAD_TXB(tx_buf_idx);
+ buf[TXBSIDH_OFF] = sid >> SIDH_SHIFT;
+ buf[TXBSIDL_OFF] = ((sid & SIDL_SID_MASK) << SIDL_SID_SHIFT) |
+ (exide << SIDL_EXIDE_SHIFT) |
+ ((eid >> SIDL_EID_SHIFT) & SIDL_EID_MASK);
+ buf[TXBEID8_OFF] = GET_BYTE(eid, 1);
+ buf[TXBEID0_OFF] = GET_BYTE(eid, 0);
+ buf[TXBDLC_OFF] = (rtr << DLC_RTR_SHIFT) | frame->can_dlc;
+ memcpy(buf + TXBDAT_OFF, frame->data, frame->can_dlc);
+ mcp251x_hw_tx_frame(spi, buf, frame->can_dlc, tx_buf_idx);
+
+ /* use INSTRUCTION_RTS, to avoid "repeated frame problem" */
+ priv->spi_tx_buf[0] = INSTRUCTION_RTS(1 << tx_buf_idx);
+ mcp251x_spi_trans(priv->spi, 1);
+}
+
+static void mcp251x_hw_rx_frame(struct spi_device *spi, u8 *buf,
+ int buf_idx)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ if (mcp251x_is_2510(spi)) {
+ int i, len;
+
+ for (i = 1; i < RXBDAT_OFF; i++)
+ buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
+
+ len = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
+ for (; i < (RXBDAT_OFF + len); i++)
+ buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
+ } else {
+ priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx);
+ mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN);
+ memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN);
+ }
+}
+
+static void mcp251x_hw_rx(struct spi_device *spi, int buf_idx)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ struct sk_buff *skb;
+ struct can_frame *frame;
+ u8 buf[SPI_TRANSFER_BUF_LEN];
+
+ skb = alloc_can_skb(priv->net, &frame);
+ if (!skb) {
+ dev_err(&spi->dev, "cannot allocate RX skb\n");
+ priv->net->stats.rx_dropped++;
+ return;
+ }
+
+ mcp251x_hw_rx_frame(spi, buf, buf_idx);
+ if (buf[RXBSIDL_OFF] & RXBSIDL_IDE) {
+ /* Extended ID format */
+ frame->can_id = CAN_EFF_FLAG;
+ frame->can_id |=
+ /* Extended ID part */
+ SET_BYTE(buf[RXBSIDL_OFF] & RXBSIDL_EID, 2) |
+ SET_BYTE(buf[RXBEID8_OFF], 1) |
+ SET_BYTE(buf[RXBEID0_OFF], 0) |
+ /* Standard ID part */
+ (((buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) |
+ (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT)) << 18);
+ /* Remote transmission request */
+ if (buf[RXBDLC_OFF] & RXBDLC_RTR)
+ frame->can_id |= CAN_RTR_FLAG;
+ } else {
+ /* Standard ID format */
+ frame->can_id =
+ (buf[RXBSIDH_OFF] << RXBSIDH_SHIFT) |
+ (buf[RXBSIDL_OFF] >> RXBSIDL_SHIFT);
+ if (buf[RXBSIDL_OFF] & RXBSIDL_SRR)
+ frame->can_id |= CAN_RTR_FLAG;
+ }
+ /* Data length */
+ frame->can_dlc = get_can_dlc(buf[RXBDLC_OFF] & RXBDLC_LEN_MASK);
+ memcpy(frame->data, buf + RXBDAT_OFF, frame->can_dlc);
+
+ priv->net->stats.rx_packets++;
+ priv->net->stats.rx_bytes += frame->can_dlc;
+
+ can_led_event(priv->net, CAN_LED_EVENT_RX);
+
+ netif_rx_ni(skb);
+}
+
+static void mcp251x_hw_sleep(struct spi_device *spi)
+{
+ mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_SLEEP);
+}
+
+static netdev_tx_t mcp251x_hard_start_xmit(struct sk_buff *skb,
+ struct net_device *net)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+ struct spi_device *spi = priv->spi;
+
+ if (priv->tx_skb || priv->tx_len) {
+ dev_warn(&spi->dev, "hard_xmit called while tx busy\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ if (can_dropped_invalid_skb(net, skb))
+ return NETDEV_TX_OK;
+
+ netif_stop_queue(net);
+ priv->tx_skb = skb;
+ queue_work(priv->wq, &priv->tx_work);
+
+ return NETDEV_TX_OK;
+}
+
+static int mcp251x_do_set_mode(struct net_device *net, enum can_mode mode)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+
+ switch (mode) {
+ case CAN_MODE_START:
+ mcp251x_clean(net);
+ /* We have to delay work since SPI I/O may sleep */
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ priv->restart_tx = 1;
+ if (priv->can.restart_ms == 0)
+ priv->after_suspend = AFTER_SUSPEND_RESTART;
+ queue_work(priv->wq, &priv->restart_work);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+static int mcp251x_set_normal_mode(struct spi_device *spi)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ unsigned long timeout;
+
+ /* Enable interrupts */
+ mcp251x_write_reg(spi, CANINTE,
+ CANINTE_ERRIE | CANINTE_TX2IE | CANINTE_TX1IE |
+ CANINTE_TX0IE | CANINTE_RX1IE | CANINTE_RX0IE);
+
+ if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
+ /* Put device into loopback mode */
+ mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LOOPBACK);
+ } else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
+ /* Put device into listen-only mode */
+ mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY);
+ } else {
+ /* Put device into normal mode */
+ mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL);
+
+ /* Wait for the device to enter normal mode */
+ timeout = jiffies + HZ;
+ while (mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) {
+ schedule();
+ if (time_after(jiffies, timeout)) {
+ dev_err(&spi->dev, "MCP251x didn't"
+ " enter in normal mode\n");
+ return -EBUSY;
+ }
+ }
+ }
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ return 0;
+}
+
+static int mcp251x_do_set_bittiming(struct net_device *net)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+ struct can_bittiming *bt = &priv->can.bittiming;
+ struct spi_device *spi = priv->spi;
+
+ mcp251x_write_reg(spi, CNF1, ((bt->sjw - 1) << CNF1_SJW_SHIFT) |
+ (bt->brp - 1));
+ mcp251x_write_reg(spi, CNF2, CNF2_BTLMODE |
+ (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES ?
+ CNF2_SAM : 0) |
+ ((bt->phase_seg1 - 1) << CNF2_PS1_SHIFT) |
+ (bt->prop_seg - 1));
+ mcp251x_write_bits(spi, CNF3, CNF3_PHSEG2_MASK,
+ (bt->phase_seg2 - 1));
+ dev_dbg(&spi->dev, "CNF: 0x%02x 0x%02x 0x%02x\n",
+ mcp251x_read_reg(spi, CNF1),
+ mcp251x_read_reg(spi, CNF2),
+ mcp251x_read_reg(spi, CNF3));
+
+ return 0;
+}
+
+static int mcp251x_setup(struct net_device *net, struct mcp251x_priv *priv,
+ struct spi_device *spi)
+{
+ mcp251x_do_set_bittiming(net);
+
+ mcp251x_write_reg(spi, RXBCTRL(0),
+ RXBCTRL_BUKT | RXBCTRL_RXM0 | RXBCTRL_RXM1);
+ mcp251x_write_reg(spi, RXBCTRL(1),
+ RXBCTRL_RXM0 | RXBCTRL_RXM1);
+ return 0;
+}
+
+static int mcp251x_hw_reset(struct spi_device *spi)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ u8 reg;
+ int ret;
+
+ /* Wait for oscillator startup timer after power up */
+ mdelay(MCP251X_OST_DELAY_MS);
+
+ priv->spi_tx_buf[0] = INSTRUCTION_RESET;
+ ret = mcp251x_spi_trans(spi, 1);
+ if (ret)
+ return ret;
+
+ /* Wait for oscillator startup timer after reset */
+ mdelay(MCP251X_OST_DELAY_MS);
+
+ reg = mcp251x_read_reg(spi, CANSTAT);
+ if ((reg & CANCTRL_REQOP_MASK) != CANCTRL_REQOP_CONF)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int mcp251x_hw_probe(struct spi_device *spi)
+{
+ u8 ctrl;
+ int ret;
+
+ ret = mcp251x_hw_reset(spi);
+ if (ret)
+ return ret;
+
+ ctrl = mcp251x_read_reg(spi, CANCTRL);
+
+ dev_dbg(&spi->dev, "CANCTRL 0x%02x\n", ctrl);
+
+ /* Check for power up default value */
+ if ((ctrl & 0x17) != 0x07)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int mcp251x_power_enable(struct regulator *reg, int enable)
+{
+ if (IS_ERR_OR_NULL(reg))
+ return 0;
+
+ if (enable)
+ return regulator_enable(reg);
+ else
+ return regulator_disable(reg);
+}
+
+static void mcp251x_open_clean(struct net_device *net)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+ struct spi_device *spi = priv->spi;
+
+ free_irq(spi->irq, priv);
+ mcp251x_hw_sleep(spi);
+ mcp251x_power_enable(priv->transceiver, 0);
+ close_candev(net);
+}
+
+static int mcp251x_stop(struct net_device *net)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+ struct spi_device *spi = priv->spi;
+
+ close_candev(net);
+
+ priv->force_quit = 1;
+ free_irq(spi->irq, priv);
+ destroy_workqueue(priv->wq);
+ priv->wq = NULL;
+
+ mutex_lock(&priv->mcp_lock);
+
+ /* Disable and clear pending interrupts */
+ mcp251x_write_reg(spi, CANINTE, 0x00);
+ mcp251x_write_reg(spi, CANINTF, 0x00);
+
+ mcp251x_write_reg(spi, TXBCTRL(0), 0);
+ mcp251x_clean(net);
+
+ mcp251x_hw_sleep(spi);
+
+ mcp251x_power_enable(priv->transceiver, 0);
+
+ priv->can.state = CAN_STATE_STOPPED;
+
+ mutex_unlock(&priv->mcp_lock);
+
+ can_led_event(net, CAN_LED_EVENT_STOP);
+
+ return 0;
+}
+
+static void mcp251x_error_skb(struct net_device *net, int can_id, int data1)
+{
+ struct sk_buff *skb;
+ struct can_frame *frame;
+
+ skb = alloc_can_err_skb(net, &frame);
+ if (skb) {
+ frame->can_id |= can_id;
+ frame->data[1] = data1;
+ netif_rx_ni(skb);
+ } else {
+ netdev_err(net, "cannot allocate error skb\n");
+ }
+}
+
+static void mcp251x_tx_work_handler(struct work_struct *ws)
+{
+ struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
+ tx_work);
+ struct spi_device *spi = priv->spi;
+ struct net_device *net = priv->net;
+ struct can_frame *frame;
+
+ mutex_lock(&priv->mcp_lock);
+ if (priv->tx_skb) {
+ if (priv->can.state == CAN_STATE_BUS_OFF) {
+ mcp251x_clean(net);
+ } else {
+ frame = (struct can_frame *)priv->tx_skb->data;
+
+ if (frame->can_dlc > CAN_FRAME_MAX_DATA_LEN)
+ frame->can_dlc = CAN_FRAME_MAX_DATA_LEN;
+ mcp251x_hw_tx(spi, frame, 0);
+ priv->tx_len = 1 + frame->can_dlc;
+ can_put_echo_skb(priv->tx_skb, net, 0);
+ priv->tx_skb = NULL;
+ }
+ }
+ mutex_unlock(&priv->mcp_lock);
+}
+
+static void mcp251x_restart_work_handler(struct work_struct *ws)
+{
+ struct mcp251x_priv *priv = container_of(ws, struct mcp251x_priv,
+ restart_work);
+ struct spi_device *spi = priv->spi;
+ struct net_device *net = priv->net;
+
+ mutex_lock(&priv->mcp_lock);
+ if (priv->after_suspend) {
+ mcp251x_hw_reset(spi);
+ mcp251x_setup(net, priv, spi);
+ if (priv->after_suspend & AFTER_SUSPEND_RESTART) {
+ mcp251x_set_normal_mode(spi);
+ } else if (priv->after_suspend & AFTER_SUSPEND_UP) {
+ netif_device_attach(net);
+ mcp251x_clean(net);
+ mcp251x_set_normal_mode(spi);
+ netif_wake_queue(net);
+ } else {
+ mcp251x_hw_sleep(spi);
+ }
+ priv->after_suspend = 0;
+ priv->force_quit = 0;
+ }
+
+ if (priv->restart_tx) {
+ priv->restart_tx = 0;
+ mcp251x_write_reg(spi, TXBCTRL(0), 0);
+ mcp251x_clean(net);
+ netif_wake_queue(net);
+ mcp251x_error_skb(net, CAN_ERR_RESTARTED, 0);
+ }
+ mutex_unlock(&priv->mcp_lock);
+}
+
+static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
+{
+ struct mcp251x_priv *priv = dev_id;
+ struct spi_device *spi = priv->spi;
+ struct net_device *net = priv->net;
+
+ mutex_lock(&priv->mcp_lock);
+ while (!priv->force_quit) {
+ enum can_state new_state;
+ u8 intf, eflag;
+ u8 clear_intf = 0;
+ int can_id = 0, data1 = 0;
+
+ mcp251x_read_2regs(spi, CANINTF, &intf, &eflag);
+
+ /* mask out flags we don't care about */
+ intf &= CANINTF_RX | CANINTF_TX | CANINTF_ERR;
+
+ /* receive buffer 0 */
+ if (intf & CANINTF_RX0IF) {
+ mcp251x_hw_rx(spi, 0);
+ /*
+ * Free one buffer ASAP
+ * (The MCP2515 does this automatically.)
+ */
+ if (mcp251x_is_2510(spi))
+ mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00);
+ }
+
+ /* receive buffer 1 */
+ if (intf & CANINTF_RX1IF) {
+ mcp251x_hw_rx(spi, 1);
+ /* the MCP2515 does this automatically */
+ if (mcp251x_is_2510(spi))
+ clear_intf |= CANINTF_RX1IF;
+ }
+
+ /* any error or tx interrupt we need to clear? */
+ if (intf & (CANINTF_ERR | CANINTF_TX))
+ clear_intf |= intf & (CANINTF_ERR | CANINTF_TX);
+ if (clear_intf)
+ mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00);
+
+ if (eflag)
+ mcp251x_write_bits(spi, EFLG, eflag, 0x00);
+
+ /* Update can state */
+ if (eflag & EFLG_TXBO) {
+ new_state = CAN_STATE_BUS_OFF;
+ can_id |= CAN_ERR_BUSOFF;
+ } else if (eflag & EFLG_TXEP) {
+ new_state = CAN_STATE_ERROR_PASSIVE;
+ can_id |= CAN_ERR_CRTL;
+ data1 |= CAN_ERR_CRTL_TX_PASSIVE;
+ } else if (eflag & EFLG_RXEP) {
+ new_state = CAN_STATE_ERROR_PASSIVE;
+ can_id |= CAN_ERR_CRTL;
+ data1 |= CAN_ERR_CRTL_RX_PASSIVE;
+ } else if (eflag & EFLG_TXWAR) {
+ new_state = CAN_STATE_ERROR_WARNING;
+ can_id |= CAN_ERR_CRTL;
+ data1 |= CAN_ERR_CRTL_TX_WARNING;
+ } else if (eflag & EFLG_RXWAR) {
+ new_state = CAN_STATE_ERROR_WARNING;
+ can_id |= CAN_ERR_CRTL;
+ data1 |= CAN_ERR_CRTL_RX_WARNING;
+ } else {
+ new_state = CAN_STATE_ERROR_ACTIVE;
+ }
+
+ /* Update can state statistics */
+ switch (priv->can.state) {
+ case CAN_STATE_ERROR_ACTIVE:
+ if (new_state >= CAN_STATE_ERROR_WARNING &&
+ new_state <= CAN_STATE_BUS_OFF)
+ priv->can.can_stats.error_warning++;
+ case CAN_STATE_ERROR_WARNING: /* fallthrough */
+ if (new_state >= CAN_STATE_ERROR_PASSIVE &&
+ new_state <= CAN_STATE_BUS_OFF)
+ priv->can.can_stats.error_passive++;
+ break;
+ default:
+ break;
+ }
+ priv->can.state = new_state;
+
+ if (intf & CANINTF_ERRIF) {
+ /* Handle overflow counters */
+ if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR)) {
+ if (eflag & EFLG_RX0OVR) {
+ net->stats.rx_over_errors++;
+ net->stats.rx_errors++;
+ }
+ if (eflag & EFLG_RX1OVR) {
+ net->stats.rx_over_errors++;
+ net->stats.rx_errors++;
+ }
+ can_id |= CAN_ERR_CRTL;
+ data1 |= CAN_ERR_CRTL_RX_OVERFLOW;
+ }
+ mcp251x_error_skb(net, can_id, data1);
+ }
+
+ if (priv->can.state == CAN_STATE_BUS_OFF) {
+ if (priv->can.restart_ms == 0) {
+ priv->force_quit = 1;
+ can_bus_off(net);
+ mcp251x_hw_sleep(spi);
+ break;
+ }
+ }
+
+ if (intf == 0)
+ break;
+
+ if (intf & CANINTF_TX) {
+ net->stats.tx_packets++;
+ net->stats.tx_bytes += priv->tx_len - 1;
+ can_led_event(net, CAN_LED_EVENT_TX);
+ if (priv->tx_len) {
+ can_get_echo_skb(net, 0);
+ priv->tx_len = 0;
+ }
+ netif_wake_queue(net);
+ }
+
+ }
+ mutex_unlock(&priv->mcp_lock);
+ return IRQ_HANDLED;
+}
+
+static int mcp251x_open(struct net_device *net)
+{
+ struct mcp251x_priv *priv = netdev_priv(net);
+ struct spi_device *spi = priv->spi;
+ unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_FALLING;
+ int ret;
+
+ ret = open_candev(net);
+ if (ret) {
+ dev_err(&spi->dev, "unable to set initial baudrate!\n");
+ return ret;
+ }
+
+ mutex_lock(&priv->mcp_lock);
+ mcp251x_power_enable(priv->transceiver, 1);
+
+ priv->force_quit = 0;
+ priv->tx_skb = NULL;
+ priv->tx_len = 0;
+
+ ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist,
+ flags, DEVICE_NAME, priv);
+ if (ret) {
+ dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
+ mcp251x_power_enable(priv->transceiver, 0);
+ close_candev(net);
+ goto open_unlock;
+ }
+
+ priv->wq = create_freezable_workqueue("mcp251x_wq");
+ INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler);
+ INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler);
+
+ ret = mcp251x_hw_reset(spi);
+ if (ret) {
+ mcp251x_open_clean(net);
+ goto open_unlock;
+ }
+ ret = mcp251x_setup(net, priv, spi);
+ if (ret) {
+ mcp251x_open_clean(net);
+ goto open_unlock;
+ }
+ ret = mcp251x_set_normal_mode(spi);
+ if (ret) {
+ mcp251x_open_clean(net);
+ goto open_unlock;
+ }
+
+ can_led_event(net, CAN_LED_EVENT_OPEN);
+
+ netif_wake_queue(net);
+
+open_unlock:
+ mutex_unlock(&priv->mcp_lock);
+ return ret;
+}
+
+static const struct net_device_ops mcp251x_netdev_ops = {
+ .ndo_open = mcp251x_open,
+ .ndo_stop = mcp251x_stop,
+ .ndo_start_xmit = mcp251x_hard_start_xmit,
+ .ndo_change_mtu = can_change_mtu,
+};
+
+static const struct of_device_id mcp251x_of_match[] = {
+ {
+ .compatible = "microchip,mcp2510",
+ .data = (void *)CAN_MCP251X_MCP2510,
+ },
+ {
+ .compatible = "microchip,mcp2515",
+ .data = (void *)CAN_MCP251X_MCP2515,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mcp251x_of_match);
+
+static const struct spi_device_id mcp251x_id_table[] = {
+ {
+ .name = "mcp2510",
+ .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2510,
+ },
+ {
+ .name = "mcp2515",
+ .driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2515,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, mcp251x_id_table);
+
+static int mcp251x_can_probe(struct spi_device *spi)
+{
+ const struct of_device_id *of_id = of_match_device(mcp251x_of_match,
+ &spi->dev);
+ struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev);
+ struct net_device *net;
+ struct mcp251x_priv *priv;
+ struct clk *clk;
+ int freq, ret;
+
+ clk = devm_clk_get(&spi->dev, NULL);
+ if (IS_ERR(clk)) {
+ if (pdata)
+ freq = pdata->oscillator_frequency;
+ else
+ return PTR_ERR(clk);
+ } else {
+ freq = clk_get_rate(clk);
+ }
+
+ /* Sanity check */
+ if (freq < 1000000 || freq > 25000000)
+ return -ERANGE;
+
+ /* Allocate can/net device */
+ net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX);
+ if (!net)
+ return -ENOMEM;
+
+ if (!IS_ERR(clk)) {
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ goto out_free;
+ }
+
+ net->netdev_ops = &mcp251x_netdev_ops;
+ net->flags |= IFF_ECHO;
+
+ priv = netdev_priv(net);
+ priv->can.bittiming_const = &mcp251x_bittiming_const;
+ priv->can.do_set_mode = mcp251x_do_set_mode;
+ priv->can.clock.freq = freq / 2;
+ priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
+ CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
+ if (of_id)
+ priv->model = (enum mcp251x_model)of_id->data;
+ else
+ priv->model = spi_get_device_id(spi)->driver_data;
+ priv->net = net;
+ priv->clk = clk;
+
+ spi_set_drvdata(spi, priv);
+
+ /* Configure the SPI bus */
+ spi->bits_per_word = 8;
+ if (mcp251x_is_2510(spi))
+ spi->max_speed_hz = spi->max_speed_hz ? : 5 * 1000 * 1000;
+ else
+ spi->max_speed_hz = spi->max_speed_hz ? : 10 * 1000 * 1000;
+ ret = spi_setup(spi);
+ if (ret)
+ goto out_clk;
+
+ priv->power = devm_regulator_get(&spi->dev, "vdd");
+ priv->transceiver = devm_regulator_get(&spi->dev, "xceiver");
+ if ((PTR_ERR(priv->power) == -EPROBE_DEFER) ||
+ (PTR_ERR(priv->transceiver) == -EPROBE_DEFER)) {
+ ret = -EPROBE_DEFER;
+ goto out_clk;
+ }
+
+ ret = mcp251x_power_enable(priv->power, 1);
+ if (ret)
+ goto out_clk;
+
+ priv->spi = spi;
+ mutex_init(&priv->mcp_lock);
+
+ /* If requested, allocate DMA buffers */
+ if (mcp251x_enable_dma) {
+ spi->dev.coherent_dma_mask = ~0;
+
+ /*
+ * Minimum coherent DMA allocation is PAGE_SIZE, so allocate
+ * that much and share it between Tx and Rx DMA buffers.
+ */
+ priv->spi_tx_buf = dma_alloc_coherent(&spi->dev,
+ PAGE_SIZE,
+ &priv->spi_tx_dma,
+ GFP_DMA);
+
+ if (priv->spi_tx_buf) {
+ priv->spi_rx_buf = (priv->spi_tx_buf + (PAGE_SIZE / 2));
+ priv->spi_rx_dma = (dma_addr_t)(priv->spi_tx_dma +
+ (PAGE_SIZE / 2));
+ } else {
+ /* Fall back to non-DMA */
+ mcp251x_enable_dma = 0;
+ }
+ }
+
+ /* Allocate non-DMA buffers */
+ if (!mcp251x_enable_dma) {
+ priv->spi_tx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
+ GFP_KERNEL);
+ if (!priv->spi_tx_buf) {
+ ret = -ENOMEM;
+ goto error_probe;
+ }
+ priv->spi_rx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
+ GFP_KERNEL);
+ if (!priv->spi_rx_buf) {
+ ret = -ENOMEM;
+ goto error_probe;
+ }
+ }
+
+ SET_NETDEV_DEV(net, &spi->dev);
+
+ /* Here is OK to not lock the MCP, no one knows about it yet */
+ ret = mcp251x_hw_probe(spi);
+ if (ret)
+ goto error_probe;
+
+ mcp251x_hw_sleep(spi);
+
+ ret = register_candev(net);
+ if (ret)
+ goto error_probe;
+
+ devm_can_led_init(net);
+
+ return 0;
+
+error_probe:
+ if (mcp251x_enable_dma)
+ dma_free_coherent(&spi->dev, PAGE_SIZE,
+ priv->spi_tx_buf, priv->spi_tx_dma);
+ mcp251x_power_enable(priv->power, 0);
+
+out_clk:
+ if (!IS_ERR(clk))
+ clk_disable_unprepare(clk);
+
+out_free:
+ free_candev(net);
+
+ return ret;
+}
+
+static int mcp251x_can_remove(struct spi_device *spi)
+{
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ struct net_device *net = priv->net;
+
+ unregister_candev(net);
+
+ if (mcp251x_enable_dma) {
+ dma_free_coherent(&spi->dev, PAGE_SIZE,
+ priv->spi_tx_buf, priv->spi_tx_dma);
+ }
+
+ mcp251x_power_enable(priv->power, 0);
+
+ if (!IS_ERR(priv->clk))
+ clk_disable_unprepare(priv->clk);
+
+ free_candev(net);
+
+ return 0;
+}
+
+static int __maybe_unused mcp251x_can_suspend(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+ struct net_device *net = priv->net;
+
+ priv->force_quit = 1;
+ disable_irq(spi->irq);
+ /*
+ * Note: at this point neither IST nor workqueues are running.
+ * open/stop cannot be called anyway so locking is not needed
+ */
+ if (netif_running(net)) {
+ netif_device_detach(net);
+
+ mcp251x_hw_sleep(spi);
+ mcp251x_power_enable(priv->transceiver, 0);
+ priv->after_suspend = AFTER_SUSPEND_UP;
+ } else {
+ priv->after_suspend = AFTER_SUSPEND_DOWN;
+ }
+
+ if (!IS_ERR_OR_NULL(priv->power)) {
+ regulator_disable(priv->power);
+ priv->after_suspend |= AFTER_SUSPEND_POWER;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused mcp251x_can_resume(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ if (priv->after_suspend & AFTER_SUSPEND_POWER) {
+ mcp251x_power_enable(priv->power, 1);
+ queue_work(priv->wq, &priv->restart_work);
+ } else {
+ if (priv->after_suspend & AFTER_SUSPEND_UP) {
+ mcp251x_power_enable(priv->transceiver, 1);
+ queue_work(priv->wq, &priv->restart_work);
+ } else {
+ priv->after_suspend = 0;
+ }
+ }
+ priv->force_quit = 0;
+ enable_irq(spi->irq);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(mcp251x_can_pm_ops, mcp251x_can_suspend,
+ mcp251x_can_resume);
+
+static struct spi_driver mcp251x_can_driver = {
+ .driver = {
+ .name = DEVICE_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = mcp251x_of_match,
+ .pm = &mcp251x_can_pm_ops,
+ },
+ .id_table = mcp251x_id_table,
+ .probe = mcp251x_can_probe,
+ .remove = mcp251x_can_remove,
+};
+module_spi_driver(mcp251x_can_driver);
+
+MODULE_AUTHOR("Chris Elston <celston@katalix.com>, "
+ "Christian Pellegrin <chripell@evolware.org>");
+MODULE_DESCRIPTION("Microchip 251x CAN driver");
+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / blogic.git / commitdiff