can: add driver for Softing card

This patch adds a driver for the platform:softing device.
This will create (up to) 2 CAN network devices from 1
platform:softing device
Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/Kconfig

@@ -117,6 +117,8 @@ source "drivers/net/can/sja1000/Kconfig"
 
 source "drivers/net/can/usb/Kconfig"
 
+source "drivers/net/can/softing/Kconfig"
+
 config CAN_DEBUG_DEVICES
 	bool "CAN devices debugging messages"
 	depends on CAN

drivers/net/can/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_CAN_DEV)		+= can-dev.o
 can-dev-y			:= dev.o
 
 obj-y				+= usb/
+obj-y				+= softing/
 
 obj-$(CONFIG_CAN_SJA1000)	+= sja1000/
 obj-$(CONFIG_CAN_MSCAN)		+= mscan/

drivers/net/can/softing/Kconfig

+config CAN_SOFTING
+	tristate "Softing Gmbh CAN generic support"
+	depends on CAN_DEV
+	---help---
+	  Support for CAN cards from Softing Gmbh & some cards
+	  from Vector Gmbh.
+	  Softing Gmbh CAN cards come with 1 or 2 physical busses.
+	  Those cards typically use Dual Port RAM to communicate
+	  with the host CPU. The interface is then identical for PCI
+	  and PCMCIA cards. This driver operates on a platform device,
+	  which has been created by softing_cs or softing_pci driver.
+	  Warning:
+	  The API of the card does not allow fine control per bus, but
+	  controls the 2 busses on the card together.
+	  As such, some actions (start/stop/busoff recovery) on 1 bus
+	  must bring down the other bus too temporarily.

drivers/net/can/softing/Makefile

+
+softing-y := softing_main.o softing_fw.o
+obj-$(CONFIG_CAN_SOFTING) += softing.o
+
+ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

drivers/net/can/softing/softing.h

+/*
+ * softing common interfaces
+ *
+ * by Kurt Van Dijck, 2008-2010
+ */
+
+#include <linux/atomic.h>
+#include <linux/netdevice.h>
+#include <linux/ktime.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+
+#include "softing_platform.h"
+
+struct softing;
+
+struct softing_priv {
+	struct can_priv can; /* must be the first member! */
+	struct net_device *netdev;
+	struct softing *card;
+	struct {
+		int pending;
+		/* variables wich hold the circular buffer */
+		int echo_put;
+		int echo_get;
+	} tx;
+	struct can_bittiming_const btr_const;
+	int index;
+	uint8_t output;
+	uint16_t chip;
+};
+#define netdev2softing(netdev)	((struct softing_priv *)netdev_priv(netdev))
+
+struct softing {
+	const struct softing_platform_data *pdat;
+	struct platform_device *pdev;
+	struct net_device *net[2];
+	spinlock_t spin; /* protect this structure & DPRAM access */
+	ktime_t ts_ref;
+	ktime_t ts_overflow; /* timestamp overflow value, in ktime */
+
+	struct {
+		/* indication of firmware status */
+		int up;
+		/* protection of the 'up' variable */
+		struct mutex lock;
+	} fw;
+	struct {
+		int nr;
+		int requested;
+		int svc_count;
+		unsigned int dpram_position;
+	} irq;
+	struct {
+		int pending;
+		int last_bus;
+		/*
+		 * keep the bus that last tx'd a message,
+		 * in order to let every netdev queue resume
+		 */
+	} tx;
+	__iomem uint8_t *dpram;
+	unsigned long dpram_phys;
+	unsigned long dpram_size;
+	struct {
+		uint16_t fw_version, hw_version, license, serial;
+		uint16_t chip[2];
+		unsigned int freq; /* remote cpu's operating frequency */
+	} id;
+};
+
+extern int softing_default_output(struct net_device *netdev);
+
+extern ktime_t softing_raw2ktime(struct softing *card, u32 raw);
+
+extern int softing_chip_poweron(struct softing *card);
+
+extern int softing_bootloader_command(struct softing *card, int16_t cmd,
+		const char *msg);
+
+/* Load firmware after reset */
+extern int softing_load_fw(const char *file, struct softing *card,
+			__iomem uint8_t *virt, unsigned int size, int offset);
+
+/* Load final application firmware after bootloader */
+extern int softing_load_app_fw(const char *file, struct softing *card);
+
+/*
+ * enable or disable irq
+ * only called with fw.lock locked
+ */
+extern int softing_enable_irq(struct softing *card, int enable);
+
+/* start/stop 1 bus on card */
+extern int softing_startstop(struct net_device *netdev, int up);
+
+/* netif_rx() */
+extern int softing_netdev_rx(struct net_device *netdev,
+		const struct can_frame *msg, ktime_t ktime);
+
+/* SOFTING DPRAM mappings */
+#define DPRAM_RX		0x0000
+	#define DPRAM_RX_SIZE	32
+	#define DPRAM_RX_CNT	16
+#define DPRAM_RX_RD		0x0201	/* uint8_t */
+#define DPRAM_RX_WR		0x0205	/* uint8_t */
+#define DPRAM_RX_LOST		0x0207	/* uint8_t */
+
+#define DPRAM_FCT_PARAM		0x0300	/* int16_t [20] */
+#define DPRAM_FCT_RESULT	0x0328	/* int16_t */
+#define DPRAM_FCT_HOST		0x032b	/* uint16_t */
+
+#define DPRAM_INFO_BUSSTATE	0x0331	/* uint16_t */
+#define DPRAM_INFO_BUSSTATE2	0x0335	/* uint16_t */
+#define DPRAM_INFO_ERRSTATE	0x0339	/* uint16_t */
+#define DPRAM_INFO_ERRSTATE2	0x033d	/* uint16_t */
+#define DPRAM_RESET		0x0341	/* uint16_t */
+#define DPRAM_CLR_RECV_FIFO	0x0345	/* uint16_t */
+#define DPRAM_RESET_TIME	0x034d	/* uint16_t */
+#define DPRAM_TIME		0x0350	/* uint64_t */
+#define DPRAM_WR_START		0x0358	/* uint8_t */
+#define DPRAM_WR_END		0x0359	/* uint8_t */
+#define DPRAM_RESET_RX_FIFO	0x0361	/* uint16_t */
+#define DPRAM_RESET_TX_FIFO	0x0364	/* uint8_t */
+#define DPRAM_READ_FIFO_LEVEL	0x0365	/* uint8_t */
+#define DPRAM_RX_FIFO_LEVEL	0x0366	/* uint16_t */
+#define DPRAM_TX_FIFO_LEVEL	0x0366	/* uint16_t */
+
+#define DPRAM_TX		0x0400	/* uint16_t */
+	#define DPRAM_TX_SIZE	16
+	#define DPRAM_TX_CNT	32
+#define DPRAM_TX_RD		0x0601	/* uint8_t */
+#define DPRAM_TX_WR		0x0605	/* uint8_t */
+
+#define DPRAM_COMMAND		0x07e0	/* uint16_t */
+#define DPRAM_RECEIPT		0x07f0	/* uint16_t */
+#define DPRAM_IRQ_TOHOST	0x07fe	/* uint8_t */
+#define DPRAM_IRQ_TOCARD	0x07ff	/* uint8_t */
+
+#define DPRAM_V2_RESET		0x0e00	/* uint8_t */
+#define DPRAM_V2_IRQ_TOHOST	0x0e02	/* uint8_t */
+
+#define TXMAX	(DPRAM_TX_CNT - 1)
+
+/* DPRAM return codes */
+#define RES_NONE	0
+#define RES_OK		1
+#define RES_NOK		2
+#define RES_UNKNOWN	3
+/* DPRAM flags */
+#define CMD_TX		0x01
+#define CMD_ACK		0x02
+#define CMD_XTD		0x04
+#define CMD_RTR		0x08
+#define CMD_ERR		0x10
+#define CMD_BUS2	0x80
+
+/* returned fifo entry bus state masks */
+#define SF_MASK_BUSOFF		0x80
+#define SF_MASK_EPASSIVE	0x60
+
+/* bus states */
+#define STATE_BUSOFF	2
+#define STATE_EPASSIVE	1
+#define STATE_EACTIVE	0

drivers/net/can/softing/softing_platform.h

+
+#include <linux/platform_device.h>
+
+#ifndef _SOFTING_DEVICE_H_
+#define _SOFTING_DEVICE_H_
+
+/* softing firmware directory prefix */
+#define fw_dir "softing-4.6/"
+
+struct softing_platform_data {
+	unsigned int manf;
+	unsigned int prod;
+	/*
+	 * generation
+	 * 1st with NEC or SJA1000
+	 * 8bit, exclusive interrupt, ...
+	 * 2nd only SJA1000
+	 * 16bit, shared interrupt
+	 */
+	int generation;
+	int nbus; /* # busses on device */
+	unsigned int freq; /* operating frequency in Hz */
+	unsigned int max_brp;
+	unsigned int max_sjw;
+	unsigned long dpram_size;
+	const char *name;
+	struct {
+		unsigned long offs;
+		unsigned long addr;
+		const char *fw;
+	} boot, load, app;
+	/*
+	 * reset() function
+	 * bring pdev in or out of reset, depending on value
+	 */
+	int (*reset)(struct platform_device *pdev, int value);
+	int (*enable_irq)(struct platform_device *pdev, int value);
+};
+
+#endif