can: Driver for the SJA1000 CAN controller

This patch adds the generic Socket-CAN driver for the Philips SJA1000
full CAN controller.
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/Kconfig

@@ -35,6 +35,12 @@ config CAN_CALC_BITTIMING
 	  arguments "tq", "prop_seg", "phase_seg1", "phase_seg2" and "sjw".
 	  If unsure, say Y.
 
+config CAN_SJA1000
+	depends on CAN_DEV
+	tristate "Philips SJA1000"
+	---help---
+	  Driver for the SJA1000 CAN controllers from Philips or NXP
+
 config CAN_DEBUG_DEVICES
 	bool "CAN devices debugging messages"
 	depends on CAN

drivers/net/can/Makefile

@@ -7,4 +7,6 @@ obj-$(CONFIG_CAN_VCAN)		+= vcan.o
 obj-$(CONFIG_CAN_DEV)		+= can-dev.o
 can-dev-y			:= dev.o
 
+obj-$(CONFIG_CAN_SJA1000)	+= sja1000/
+
 ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

drivers/net/can/sja1000/Makefile

+#
+#  Makefile for the SJA1000 CAN controller drivers.
+#
+
+obj-$(CONFIG_CAN_SJA1000) += sja1000.o
+
+ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

drivers/net/can/sja1000/sja1000.h

+/*
+ * sja1000.h -  Philips SJA1000 network device driver
+ *
+ * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
+ * 38106 Braunschweig, GERMANY
+ *
+ * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Volkswagen nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * Alternatively, provided that this notice is retained in full, this
+ * software may be distributed under the terms of the GNU General
+ * Public License ("GPL") version 2, in which case the provisions of the
+ * GPL apply INSTEAD OF those given above.
+ *
+ * The provided data structures and external interfaces from this code
+ * are not restricted to be used by modules with a GPL compatible license.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * Send feedback to <socketcan-users@lists.berlios.de>
+ *
+ */
+
+#ifndef SJA1000_DEV_H
+#define SJA1000_DEV_H
+
+#include <linux/can/dev.h>
+#include <linux/can/platform/sja1000.h>
+
+#define SJA1000_MAX_IRQ 20	/* max. number of interrupts handled in ISR */
+
+/* SJA1000 registers - manual section 6.4 (Pelican Mode) */
+#define REG_MOD		0x00
+#define REG_CMR		0x01
+#define REG_SR		0x02
+#define REG_IR		0x03
+#define REG_IER		0x04
+#define REG_ALC		0x0B
+#define REG_ECC		0x0C
+#define REG_EWL		0x0D
+#define REG_RXERR	0x0E
+#define REG_TXERR	0x0F
+#define REG_ACCC0	0x10
+#define REG_ACCC1	0x11
+#define REG_ACCC2	0x12
+#define REG_ACCC3	0x13
+#define REG_ACCM0	0x14
+#define REG_ACCM1	0x15
+#define REG_ACCM2	0x16
+#define REG_ACCM3	0x17
+#define REG_RMC		0x1D
+#define REG_RBSA	0x1E
+
+/* Common registers - manual section 6.5 */
+#define REG_BTR0	0x06
+#define REG_BTR1	0x07
+#define REG_OCR		0x08
+#define REG_CDR		0x1F
+
+#define REG_FI		0x10
+#define SFF_BUF		0x13
+#define EFF_BUF		0x15
+
+#define FI_FF		0x80
+#define FI_RTR		0x40
+
+#define REG_ID1		0x11
+#define REG_ID2		0x12
+#define REG_ID3		0x13
+#define REG_ID4		0x14
+
+#define CAN_RAM		0x20
+
+/* mode register */
+#define MOD_RM		0x01
+#define MOD_LOM		0x02
+#define MOD_STM		0x04
+#define MOD_AFM		0x08
+#define MOD_SM		0x10
+
+/* commands */
+#define CMD_SRR		0x10
+#define CMD_CDO		0x08
+#define CMD_RRB		0x04
+#define CMD_AT		0x02
+#define CMD_TR		0x01
+
+/* interrupt sources */
+#define IRQ_BEI		0x80
+#define IRQ_ALI		0x40
+#define IRQ_EPI		0x20
+#define IRQ_WUI		0x10
+#define IRQ_DOI		0x08
+#define IRQ_EI		0x04
+#define IRQ_TI		0x02
+#define IRQ_RI		0x01
+#define IRQ_ALL		0xFF
+#define IRQ_OFF		0x00
+
+/* status register content */
+#define SR_BS		0x80
+#define SR_ES		0x40
+#define SR_TS		0x20
+#define SR_RS		0x10
+#define SR_TCS		0x08
+#define SR_TBS		0x04
+#define SR_DOS		0x02
+#define SR_RBS		0x01
+
+#define SR_CRIT (SR_BS|SR_ES)
+
+/* ECC register */
+#define ECC_SEG		0x1F
+#define ECC_DIR		0x20
+#define ECC_ERR		6
+#define ECC_BIT		0x00
+#define ECC_FORM	0x40
+#define ECC_STUFF	0x80
+#define ECC_MASK	0xc0
+
+/*
+ * Flags for sja1000priv.flags
+ */
+#define SJA1000_CUSTOM_IRQ_HANDLER 0x1
+
+/*
+ * SJA1000 private data structure
+ */
+struct sja1000_priv {
+	struct can_priv can;	/* must be the first member */
+	int open_time;
+	struct sk_buff *echo_skb;
+
+	/* the lower-layer is responsible for appropriate locking */
+	u8 (*read_reg) (const struct net_device *dev, int reg);
+	void (*write_reg) (const struct net_device *dev, int reg, u8 val);
+	void (*pre_irq) (const struct net_device *dev);
+	void (*post_irq) (const struct net_device *dev);
+
+	void *priv;		/* for board-specific data */
+	struct net_device *dev;
+
+	unsigned long irq_flags; /* for request_irq() */
+
+	u16 flags;		/* custom mode flags */
+	u8 ocr;			/* output control register */
+	u8 cdr;			/* clock divider register */
+};
+
+struct net_device *alloc_sja1000dev(int sizeof_priv);
+void free_sja1000dev(struct net_device *dev);
+int register_sja1000dev(struct net_device *dev);
+void unregister_sja1000dev(struct net_device *dev);
+
+irqreturn_t sja1000_interrupt(int irq, void *dev_id);
+
+#endif /* SJA1000_DEV_H */