can: Add driver for esd CAN-USB/2 device

This patch adds a driver for esd's USB high speed
CAN interface. The driver supports devices with
multiple CAN interfaces.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 1139 insertions, 0 deletions

diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig
index 97ff6febad63..04525495b15b 100644
--- a/drivers/net/can/usb/Kconfig
+++ b/drivers/net/can/usb/Kconfig
@@ -7,4 +7,10 @@ config CAN_EMS_USB
           This driver is for the one channel CPC-USB/ARM7 CAN/USB interface
           from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
 
+config CAN_ESD_USB2
+        tristate "ESD USB/2 CAN/USB interface"
+        ---help---
+          This driver supports the CAN-USB/2 interface
+          from esd electronic system design gmbh (http://www.esd.eu).
+
 endmenu
diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile
index 0afd51d4c7a5..fce3cf11719f 100644
--- a/drivers/net/can/usb/Makefile
+++ b/drivers/net/can/usb/Makefile
@@ -3,5 +3,6 @@
 #
 
 obj-$(CONFIG_CAN_EMS_USB) += ems_usb.o
+obj-$(CONFIG_CAN_ESD_USB2) += esd_usb2.o
 
 ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c
new file mode 100644
index 000000000000..05a52754f486
--- /dev/null
+++ b/drivers/net/can/usb/esd_usb2.c
@@ -0,0 +1,1132 @@
+/*
+ * CAN driver for esd CAN-USB/2
+ *
+ * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; version 2 of the License.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
+MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 interfaces");
+MODULE_LICENSE("GPL v2");
+
+/* Define these values to match your devices */
+#define USB_ESDGMBH_VENDOR_ID   0x0ab4
+#define USB_CANUSB2_PRODUCT_ID  0x0010
+
+#define ESD_USB2_CAN_CLOCK      60000000
+#define ESD_USB2_MAX_NETS       2
+
+/* USB2 commands */
+#define CMD_VERSION             1 /* also used for VERSION_REPLY */
+#define CMD_CAN_RX              2 /* device to host only */
+#define CMD_CAN_TX              3 /* also used for TX_DONE */
+#define CMD_SETBAUD             4 /* also used for SETBAUD_REPLY */
+#define CMD_TS                  5 /* also used for TS_REPLY */
+#define CMD_IDADD               6 /* also used for IDADD_REPLY */
+
+/* esd CAN message flags - dlc field */
+#define ESD_RTR                 0x10
+
+/* esd CAN message flags - id field */
+#define ESD_EXTID               0x20000000
+#define ESD_EVENT               0x40000000
+#define ESD_IDMASK              0x1fffffff
+
+/* esd CAN event ids used by this driver */
+#define ESD_EV_CAN_ERROR_EXT    2
+
+/* baudrate message flags */
+#define ESD_USB2_UBR            0x80000000
+#define ESD_USB2_LOM            0x40000000
+#define ESD_USB2_NO_BAUDRATE    0x7fffffff
+#define ESD_USB2_TSEG1_MIN      1
+#define ESD_USB2_TSEG1_MAX      16
+#define ESD_USB2_TSEG1_SHIFT    16
+#define ESD_USB2_TSEG2_MIN      1
+#define ESD_USB2_TSEG2_MAX      8
+#define ESD_USB2_TSEG2_SHIFT    20
+#define ESD_USB2_SJW_MAX        4
+#define ESD_USB2_SJW_SHIFT      14
+#define ESD_USB2_BRP_MIN        1
+#define ESD_USB2_BRP_MAX        1024
+#define ESD_USB2_BRP_INC        1
+#define ESD_USB2_3_SAMPLES      0x00800000
+
+/* esd IDADD message */
+#define ESD_ID_ENABLE           0x80
+#define ESD_MAX_ID_SEGMENT      64
+
+/* SJA1000 ECC register (emulated by usb2 firmware) */
+#define SJA1000_ECC_SEG         0x1F
+#define SJA1000_ECC_DIR         0x20
+#define SJA1000_ECC_ERR         0x06
+#define SJA1000_ECC_BIT         0x00
+#define SJA1000_ECC_FORM        0x40
+#define SJA1000_ECC_STUFF       0x80
+#define SJA1000_ECC_MASK        0xc0
+
+/* esd bus state event codes */
+#define ESD_BUSSTATE_MASK       0xc0
+#define ESD_BUSSTATE_WARN       0x40
+#define ESD_BUSSTATE_ERRPASSIVE 0x80
+#define ESD_BUSSTATE_BUSOFF     0xc0
+
+#define RX_BUFFER_SIZE          1024
+#define MAX_RX_URBS             4
+#define MAX_TX_URBS             16 /* must be power of 2 */
+
+struct header_msg {
+        u8 len; /* len is always the total message length in 32bit words */
+        u8 cmd;
+        u8 rsvd[2];
+};
+
+struct version_msg {
+        u8 len;
+        u8 cmd;
+        u8 rsvd;
+        u8 flags;
+        __le32 drv_version;
+};
+
+struct version_reply_msg {
+        u8 len;
+        u8 cmd;
+        u8 nets;
+        u8 features;
+        __le32 version;
+        u8 name[16];
+        __le32 rsvd;
+        __le32 ts;
+};
+
+struct rx_msg {
+        u8 len;
+        u8 cmd;
+        u8 net;
+        u8 dlc;
+        __le32 ts;
+        __le32 id; /* upper 3 bits contain flags */
+        u8 data[8];
+};
+
+struct tx_msg {
+        u8 len;
+        u8 cmd;
+        u8 net;
+        u8 dlc;
+        __le32 hnd;
+        __le32 id; /* upper 3 bits contain flags */
+        u8 data[8];
+};
+
+struct tx_done_msg {
+        u8 len;
+        u8 cmd;
+        u8 net;
+        u8 status;
+        __le32 hnd;
+        __le32 ts;
+};
+
+struct id_filter_msg {
+        u8 len;
+        u8 cmd;
+        u8 net;
+        u8 option;
+        __le32 mask[ESD_MAX_ID_SEGMENT + 1];
+};
+
+struct set_baudrate_msg {
+        u8 len;
+        u8 cmd;
+        u8 net;
+        u8 rsvd;
+        __le32 baud;
+};
+
+/* Main message type used between library and application */
+str