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>

1 files changed, 180 insertions, 0 deletions

diff --git a/drivers/net/can/sja1000/sja1000.h b/drivers/net/can/sja1000/sja1000.h
new file mode 100644
index 000000000000..ccd302887964
--- /dev/null
+++ b/drivers/net/can/sja1000/sja1000.h
@@ -0,0 +1,180 @@
+/*
+ * 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 */