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![Florian Westphal](/assets/img/avatar_default.png)
Replace all trans_start updates with netif_trans_update helper. change was done via spatch: struct net_device *d; @@ - d->trans_start = jiffies + netif_trans_update(d) Compile tested only. Cc: user-mode-linux-devel@lists.sourceforge.net Cc: linux-xtensa@linux-xtensa.org Cc: linux1394-devel@lists.sourceforge.net Cc: linux-rdma@vger.kernel.org Cc: netdev@vger.kernel.org Cc: MPT-FusionLinux.pdl@broadcom.com Cc: linux-scsi@vger.kernel.org Cc: linux-can@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linux-omap@vger.kernel.org Cc: linux-hams@vger.kernel.org Cc: linux-usb@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: devel@driverdev.osuosl.org Cc: b.a.t.m.a.n@lists.open-mesh.org Cc: linux-bluetooth@vger.kernel.org Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Acked-by: Mugunthan V N <mugunthanvnm@ti.com> Acked-by: Antonio Quartulli <a@unstable.cc> Signed-off-by: David S. Miller <davem@davemloft.net>
1088 lines
26 KiB
C
1088 lines
26 KiB
C
/*
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* CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7
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*
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* Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/usb.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/can/error.h>
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MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>");
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MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
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MODULE_LICENSE("GPL v2");
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/* Control-Values for CPC_Control() Command Subject Selection */
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#define CONTR_CAN_MESSAGE 0x04
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#define CONTR_CAN_STATE 0x0C
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#define CONTR_BUS_ERROR 0x1C
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/* Control Command Actions */
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#define CONTR_CONT_OFF 0
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#define CONTR_CONT_ON 1
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#define CONTR_ONCE 2
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/* Messages from CPC to PC */
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#define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */
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#define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */
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#define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */
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#define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */
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#define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */
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#define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */
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#define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */
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#define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */
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#define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */
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#define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */
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#define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */
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/* Messages from the PC to the CPC interface */
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#define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */
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#define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */
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#define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */
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#define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */
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#define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */
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#define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */
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#define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */
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#define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */
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#define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */
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#define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */
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#define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */
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#define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */
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#define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */
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/* Overrun types */
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#define CPC_OVR_EVENT_CAN 0x01
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#define CPC_OVR_EVENT_CANSTATE 0x02
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#define CPC_OVR_EVENT_BUSERROR 0x04
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/*
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* If the CAN controller lost a message we indicate it with the highest bit
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* set in the count field.
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*/
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#define CPC_OVR_HW 0x80
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/* Size of the "struct ems_cpc_msg" without the union */
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#define CPC_MSG_HEADER_LEN 11
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#define CPC_CAN_MSG_MIN_SIZE 5
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/* Define these values to match your devices */
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#define USB_CPCUSB_VENDOR_ID 0x12D6
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#define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444
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/* Mode register NXP LPC2119/SJA1000 CAN Controller */
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#define SJA1000_MOD_NORMAL 0x00
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#define SJA1000_MOD_RM 0x01
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/* ECC register NXP LPC2119/SJA1000 CAN Controller */
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#define SJA1000_ECC_SEG 0x1F
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#define SJA1000_ECC_DIR 0x20
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#define SJA1000_ECC_ERR 0x06
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#define SJA1000_ECC_BIT 0x00
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#define SJA1000_ECC_FORM 0x40
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#define SJA1000_ECC_STUFF 0x80
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#define SJA1000_ECC_MASK 0xc0
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/* Status register content */
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#define SJA1000_SR_BS 0x80
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#define SJA1000_SR_ES 0x40
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#define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA
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/*
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* The device actually uses a 16MHz clock to generate the CAN clock
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* but it expects SJA1000 bit settings based on 8MHz (is internally
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* converted).
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*/
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#define EMS_USB_ARM7_CLOCK 8000000
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#define CPC_TX_QUEUE_TRIGGER_LOW 25
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#define CPC_TX_QUEUE_TRIGGER_HIGH 35
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/*
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* CAN-Message representation in a CPC_MSG. Message object type is
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* CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or
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* CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME.
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*/
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struct cpc_can_msg {
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__le32 id;
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u8 length;
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u8 msg[8];
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};
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/* Representation of the CAN parameters for the SJA1000 controller */
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struct cpc_sja1000_params {
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u8 mode;
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u8 acc_code0;
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u8 acc_code1;
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u8 acc_code2;
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u8 acc_code3;
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u8 acc_mask0;
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u8 acc_mask1;
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u8 acc_mask2;
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u8 acc_mask3;
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u8 btr0;
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u8 btr1;
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u8 outp_contr;
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};
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/* CAN params message representation */
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struct cpc_can_params {
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u8 cc_type;
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/* Will support M16C CAN controller in the future */
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union {
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struct cpc_sja1000_params sja1000;
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} cc_params;
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};
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/* Structure for confirmed message handling */
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struct cpc_confirm {
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u8 error; /* error code */
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};
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/* Structure for overrun conditions */
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struct cpc_overrun {
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u8 event;
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u8 count;
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};
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/* SJA1000 CAN errors (compatible to NXP LPC2119) */
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struct cpc_sja1000_can_error {
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u8 ecc;
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u8 rxerr;
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u8 txerr;
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};
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/* structure for CAN error conditions */
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struct cpc_can_error {
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u8 ecode;
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struct {
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u8 cc_type;
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/* Other controllers may also provide error code capture regs */
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union {
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struct cpc_sja1000_can_error sja1000;
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} regs;
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} cc;
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};
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/*
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* Structure containing RX/TX error counter. This structure is used to request
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* the values of the CAN controllers TX and RX error counter.
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*/
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struct cpc_can_err_counter {
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u8 rx;
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u8 tx;
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};
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/* Main message type used between library and application */
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struct __packed ems_cpc_msg {
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u8 type; /* type of message */
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u8 length; /* length of data within union 'msg' */
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u8 msgid; /* confirmation handle */
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__le32 ts_sec; /* timestamp in seconds */
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__le32 ts_nsec; /* timestamp in nano seconds */
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union {
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u8 generic[64];
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struct cpc_can_msg can_msg;
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struct cpc_can_params can_params;
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struct cpc_confirm confirmation;
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struct cpc_overrun overrun;
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struct cpc_can_error error;
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struct cpc_can_err_counter err_counter;
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u8 can_state;
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} msg;
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};
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/*
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* Table of devices that work with this driver
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* NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet.
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*/
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static struct usb_device_id ems_usb_table[] = {
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{USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)},
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{} /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, ems_usb_table);
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#define RX_BUFFER_SIZE 64
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#define CPC_HEADER_SIZE 4
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#define INTR_IN_BUFFER_SIZE 4
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#define MAX_RX_URBS 10
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#define MAX_TX_URBS 10
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struct ems_usb;
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struct ems_tx_urb_context {
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struct ems_usb *dev;
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u32 echo_index;
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u8 dlc;
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};
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struct ems_usb {
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struct can_priv can; /* must be the first member */
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struct sk_buff *echo_skb[MAX_TX_URBS];
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struct usb_device *udev;
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struct net_device *netdev;
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atomic_t active_tx_urbs;
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struct usb_anchor tx_submitted;
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struct ems_tx_urb_context tx_contexts[MAX_TX_URBS];
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struct usb_anchor rx_submitted;
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struct urb *intr_urb;
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u8 *tx_msg_buffer;
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u8 *intr_in_buffer;
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unsigned int free_slots; /* remember number of available slots */
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struct ems_cpc_msg active_params; /* active controller parameters */
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};
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static void ems_usb_read_interrupt_callback(struct urb *urb)
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{
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struct ems_usb *dev = urb->context;
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struct net_device *netdev = dev->netdev;
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int err;
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if (!netif_device_present(netdev))
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return;
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switch (urb->status) {
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case 0:
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dev->free_slots = dev->intr_in_buffer[1];
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if (dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH &&
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netif_queue_stopped(netdev))
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netif_wake_queue(netdev);
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break;
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case -ECONNRESET: /* unlink */
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case -ENOENT:
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case -ESHUTDOWN:
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return;
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default:
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netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status);
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break;
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}
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err = usb_submit_urb(urb, GFP_ATOMIC);
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if (err == -ENODEV)
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netif_device_detach(netdev);
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else if (err)
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netdev_err(netdev, "failed resubmitting intr urb: %d\n", err);
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}
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static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
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{
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struct can_frame *cf;
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struct sk_buff *skb;
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int i;
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struct net_device_stats *stats = &dev->netdev->stats;
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skb = alloc_can_skb(dev->netdev, &cf);
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if (skb == NULL)
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return;
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cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
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cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF);
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if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
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msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
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cf->can_id |= CAN_EFF_FLAG;
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if (msg->type == CPC_MSG_TYPE_RTR_FRAME ||
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msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
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cf->can_id |= CAN_RTR_FLAG;
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} else {
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for (i = 0; i < cf->can_dlc; i++)
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cf->data[i] = msg->msg.can_msg.msg[i];
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}
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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netif_rx(skb);
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}
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static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
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{
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struct can_frame *cf;
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struct sk_buff *skb;
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struct net_device_stats *stats = &dev->netdev->stats;
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skb = alloc_can_err_skb(dev->netdev, &cf);
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if (skb == NULL)
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return;
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if (msg->type == CPC_MSG_TYPE_CAN_STATE) {
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u8 state = msg->msg.can_state;
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if (state & SJA1000_SR_BS) {
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dev->can.state = CAN_STATE_BUS_OFF;
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cf->can_id |= CAN_ERR_BUSOFF;
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dev->can.can_stats.bus_off++;
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can_bus_off(dev->netdev);
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} else if (state & SJA1000_SR_ES) {
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dev->can.state = CAN_STATE_ERROR_WARNING;
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dev->can.can_stats.error_warning++;
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} else {
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dev->can.state = CAN_STATE_ERROR_ACTIVE;
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dev->can.can_stats.error_passive++;
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}
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} else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) {
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u8 ecc = msg->msg.error.cc.regs.sja1000.ecc;
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u8 txerr = msg->msg.error.cc.regs.sja1000.txerr;
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u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr;
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/* bus error interrupt */
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dev->can.can_stats.bus_error++;
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stats->rx_errors++;
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cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
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switch (ecc & SJA1000_ECC_MASK) {
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case SJA1000_ECC_BIT:
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cf->data[2] |= CAN_ERR_PROT_BIT;
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break;
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case SJA1000_ECC_FORM:
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cf->data[2] |= CAN_ERR_PROT_FORM;
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break;
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case SJA1000_ECC_STUFF:
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cf->data[2] |= CAN_ERR_PROT_STUFF;
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break;
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default:
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cf->data[3] = ecc & SJA1000_ECC_SEG;
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break;
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}
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/* Error occurred during transmission? */
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if ((ecc & SJA1000_ECC_DIR) == 0)
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cf->data[2] |= CAN_ERR_PROT_TX;
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if (dev->can.state == CAN_STATE_ERROR_WARNING ||
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dev->can.state == CAN_STATE_ERROR_PASSIVE) {
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cf->data[1] = (txerr > rxerr) ?
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CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE;
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}
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} else if (msg->type == CPC_MSG_TYPE_OVERRUN) {
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cf->can_id |= CAN_ERR_CRTL;
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cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
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stats->rx_over_errors++;
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stats->rx_errors++;
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}
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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netif_rx(skb);
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}
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/*
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* callback for bulk IN urb
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*/
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static void ems_usb_read_bulk_callback(struct urb *urb)
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{
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struct ems_usb *dev = urb->context;
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struct net_device *netdev;
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int retval;
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netdev = dev->netdev;
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if (!netif_device_present(netdev))
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return;
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switch (urb->status) {
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case 0: /* success */
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break;
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case -ENOENT:
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return;
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default:
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netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
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goto resubmit_urb;
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}
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if (urb->actual_length > CPC_HEADER_SIZE) {
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struct ems_cpc_msg *msg;
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u8 *ibuf = urb->transfer_buffer;
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u8 msg_count, start;
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msg_count = ibuf[0] & ~0x80;
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start = CPC_HEADER_SIZE;
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while (msg_count) {
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msg = (struct ems_cpc_msg *)&ibuf[start];
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switch (msg->type) {
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case CPC_MSG_TYPE_CAN_STATE:
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/* Process CAN state changes */
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ems_usb_rx_err(dev, msg);
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break;
|
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case CPC_MSG_TYPE_CAN_FRAME:
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case CPC_MSG_TYPE_EXT_CAN_FRAME:
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case CPC_MSG_TYPE_RTR_FRAME:
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case CPC_MSG_TYPE_EXT_RTR_FRAME:
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ems_usb_rx_can_msg(dev, msg);
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break;
|
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case CPC_MSG_TYPE_CAN_FRAME_ERROR:
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/* Process errorframe */
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ems_usb_rx_err(dev, msg);
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break;
|
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|
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case CPC_MSG_TYPE_OVERRUN:
|
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/* Message lost while receiving */
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ems_usb_rx_err(dev, msg);
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break;
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}
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start += CPC_MSG_HEADER_LEN + msg->length;
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msg_count--;
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|
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if (start > urb->transfer_buffer_length) {
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netdev_err(netdev, "format error\n");
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break;
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}
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}
|
|
}
|
|
|
|
resubmit_urb:
|
|
usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
|
|
urb->transfer_buffer, RX_BUFFER_SIZE,
|
|
ems_usb_read_bulk_callback, dev);
|
|
|
|
retval = usb_submit_urb(urb, GFP_ATOMIC);
|
|
|
|
if (retval == -ENODEV)
|
|
netif_device_detach(netdev);
|
|
else if (retval)
|
|
netdev_err(netdev,
|
|
"failed resubmitting read bulk urb: %d\n", retval);
|
|
}
|
|
|
|
/*
|
|
* callback for bulk IN urb
|
|
*/
|
|
static void ems_usb_write_bulk_callback(struct urb *urb)
|
|
{
|
|
struct ems_tx_urb_context *context = urb->context;
|
|
struct ems_usb *dev;
|
|
struct net_device *netdev;
|
|
|
|
BUG_ON(!context);
|
|
|
|
dev = context->dev;
|
|
netdev = dev->netdev;
|
|
|
|
/* free up our allocated buffer */
|
|
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
|
|
urb->transfer_buffer, urb->transfer_dma);
|
|
|
|
atomic_dec(&dev->active_tx_urbs);
|
|
|
|
if (!netif_device_present(netdev))
|
|
return;
|
|
|
|
if (urb->status)
|
|
netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
|
|
|
|
netif_trans_update(netdev);
|
|
|
|
/* transmission complete interrupt */
|
|
netdev->stats.tx_packets++;
|
|
netdev->stats.tx_bytes += context->dlc;
|
|
|
|
can_get_echo_skb(netdev, context->echo_index);
|
|
|
|
/* Release context */
|
|
context->echo_index = MAX_TX_URBS;
|
|
|
|
}
|
|
|
|
/*
|
|
* Send the given CPC command synchronously
|
|
*/
|
|
static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
|
|
{
|
|
int actual_length;
|
|
|
|
/* Copy payload */
|
|
memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg,
|
|
msg->length + CPC_MSG_HEADER_LEN);
|
|
|
|
/* Clear header */
|
|
memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE);
|
|
|
|
return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
|
|
&dev->tx_msg_buffer[0],
|
|
msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE,
|
|
&actual_length, 1000);
|
|
}
|
|
|
|
/*
|
|
* Change CAN controllers' mode register
|
|
*/
|
|
static int ems_usb_write_mode(struct ems_usb *dev, u8 mode)
|
|
{
|
|
dev->active_params.msg.can_params.cc_params.sja1000.mode = mode;
|
|
|
|
return ems_usb_command_msg(dev, &dev->active_params);
|
|
}
|
|
|
|
/*
|
|
* Send a CPC_Control command to change behaviour when interface receives a CAN
|
|
* message, bus error or CAN state changed notifications.
|
|
*/
|
|
static int ems_usb_control_cmd(struct ems_usb *dev, u8 val)
|
|
{
|
|
struct ems_cpc_msg cmd;
|
|
|
|
cmd.type = CPC_CMD_TYPE_CONTROL;
|
|
cmd.length = CPC_MSG_HEADER_LEN + 1;
|
|
|
|
cmd.msgid = 0;
|
|
|
|
cmd.msg.generic[0] = val;
|
|
|
|
return ems_usb_command_msg(dev, &cmd);
|
|
}
|
|
|
|
/*
|
|
* Start interface
|
|
*/
|
|
static int ems_usb_start(struct ems_usb *dev)
|
|
{
|
|
struct net_device *netdev = dev->netdev;
|
|
int err, i;
|
|
|
|
dev->intr_in_buffer[0] = 0;
|
|
dev->free_slots = 50; /* initial size */
|
|
|
|
for (i = 0; i < MAX_RX_URBS; i++) {
|
|
struct urb *urb = NULL;
|
|
u8 *buf = NULL;
|
|
|
|
/* create a URB, and a buffer for it */
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb) {
|
|
netdev_err(netdev, "No memory left for URBs\n");
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
|
|
&urb->transfer_dma);
|
|
if (!buf) {
|
|
netdev_err(netdev, "No memory left for USB buffer\n");
|
|
usb_free_urb(urb);
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
|
|
buf, RX_BUFFER_SIZE,
|
|
ems_usb_read_bulk_callback, dev);
|
|
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
usb_anchor_urb(urb, &dev->rx_submitted);
|
|
|
|
err = usb_submit_urb(urb, GFP_KERNEL);
|
|
if (err) {
|
|
usb_unanchor_urb(urb);
|
|
usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
|
|
urb->transfer_dma);
|
|
usb_free_urb(urb);
|
|
break;
|
|
}
|
|
|
|
/* Drop reference, USB core will take care of freeing it */
|
|
usb_free_urb(urb);
|
|
}
|
|
|
|
/* Did we submit any URBs */
|
|
if (i == 0) {
|
|
netdev_warn(netdev, "couldn't setup read URBs\n");
|
|
return err;
|
|
}
|
|
|
|
/* Warn if we've couldn't transmit all the URBs */
|
|
if (i < MAX_RX_URBS)
|
|
netdev_warn(netdev, "rx performance may be slow\n");
|
|
|
|
/* Setup and start interrupt URB */
|
|
usb_fill_int_urb(dev->intr_urb, dev->udev,
|
|
usb_rcvintpipe(dev->udev, 1),
|
|
dev->intr_in_buffer,
|
|
INTR_IN_BUFFER_SIZE,
|
|
ems_usb_read_interrupt_callback, dev, 1);
|
|
|
|
err = usb_submit_urb(dev->intr_urb, GFP_KERNEL);
|
|
if (err) {
|
|
netdev_warn(netdev, "intr URB submit failed: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* CPC-USB will transfer received message to host */
|
|
err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
|
|
if (err)
|
|
goto failed;
|
|
|
|
/* CPC-USB will transfer CAN state changes to host */
|
|
err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
|
|
if (err)
|
|
goto failed;
|
|
|
|
/* CPC-USB will transfer bus errors to host */
|
|
err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);
|
|
if (err)
|
|
goto failed;
|
|
|
|
err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL);
|
|
if (err)
|
|
goto failed;
|
|
|
|
dev->can.state = CAN_STATE_ERROR_ACTIVE;
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
netdev_warn(netdev, "couldn't submit control: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void unlink_all_urbs(struct ems_usb *dev)
|
|
{
|
|
int i;
|
|
|
|
usb_unlink_urb(dev->intr_urb);
|
|
|
|
usb_kill_anchored_urbs(&dev->rx_submitted);
|
|
|
|
usb_kill_anchored_urbs(&dev->tx_submitted);
|
|
atomic_set(&dev->active_tx_urbs, 0);
|
|
|
|
for (i = 0; i < MAX_TX_URBS; i++)
|
|
dev->tx_contexts[i].echo_index = MAX_TX_URBS;
|
|
}
|
|
|
|
static int ems_usb_open(struct net_device *netdev)
|
|
{
|
|
struct ems_usb *dev = netdev_priv(netdev);
|
|
int err;
|
|
|
|
err = ems_usb_write_mode(dev, SJA1000_MOD_RM);
|
|
if (err)
|
|
return err;
|
|
|
|
/* common open */
|
|
err = open_candev(netdev);
|
|
if (err)
|
|
return err;
|
|
|
|
/* finally start device */
|
|
err = ems_usb_start(dev);
|
|
if (err) {
|
|
if (err == -ENODEV)
|
|
netif_device_detach(dev->netdev);
|
|
|
|
netdev_warn(netdev, "couldn't start device: %d\n", err);
|
|
|
|
close_candev(netdev);
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
netif_start_queue(netdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
|
|
{
|
|
struct ems_usb *dev = netdev_priv(netdev);
|
|
struct ems_tx_urb_context *context = NULL;
|
|
struct net_device_stats *stats = &netdev->stats;
|
|
struct can_frame *cf = (struct can_frame *)skb->data;
|
|
struct ems_cpc_msg *msg;
|
|
struct urb *urb;
|
|
u8 *buf;
|
|
int i, err;
|
|
size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
|
|
+ sizeof(struct cpc_can_msg);
|
|
|
|
if (can_dropped_invalid_skb(netdev, skb))
|
|
return NETDEV_TX_OK;
|
|
|
|
/* create a URB, and a buffer for it, and copy the data to the URB */
|
|
urb = usb_alloc_urb(0, GFP_ATOMIC);
|
|
if (!urb) {
|
|
netdev_err(netdev, "No memory left for URBs\n");
|
|
goto nomem;
|
|
}
|
|
|
|
buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
|
|
if (!buf) {
|
|
netdev_err(netdev, "No memory left for USB buffer\n");
|
|
usb_free_urb(urb);
|
|
goto nomem;
|
|
}
|
|
|
|
msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
|
|
|
|
msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
|
|
msg->msg.can_msg.length = cf->can_dlc;
|
|
|
|
if (cf->can_id & CAN_RTR_FLAG) {
|
|
msg->type = cf->can_id & CAN_EFF_FLAG ?
|
|
CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
|
|
|
|
msg->length = CPC_CAN_MSG_MIN_SIZE;
|
|
} else {
|
|
msg->type = cf->can_id & CAN_EFF_FLAG ?
|
|
CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
|
|
|
|
for (i = 0; i < cf->can_dlc; i++)
|
|
msg->msg.can_msg.msg[i] = cf->data[i];
|
|
|
|
msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
|
|
}
|
|
|
|
for (i = 0; i < MAX_TX_URBS; i++) {
|
|
if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
|
|
context = &dev->tx_contexts[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* May never happen! When this happens we'd more URBs in flight as
|
|
* allowed (MAX_TX_URBS).
|
|
*/
|
|
if (!context) {
|
|
usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
|
|
usb_free_urb(urb);
|
|
|
|
netdev_warn(netdev, "couldn't find free context\n");
|
|
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
|
|
context->dev = dev;
|
|
context->echo_index = i;
|
|
context->dlc = cf->can_dlc;
|
|
|
|
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
|
|
size, ems_usb_write_bulk_callback, context);
|
|
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
usb_anchor_urb(urb, &dev->tx_submitted);
|
|
|
|
can_put_echo_skb(skb, netdev, context->echo_index);
|
|
|
|
atomic_inc(&dev->active_tx_urbs);
|
|
|
|
err = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (unlikely(err)) {
|
|
can_free_echo_skb(netdev, context->echo_index);
|
|
|
|
usb_unanchor_urb(urb);
|
|
usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
|
|
dev_kfree_skb(skb);
|
|
|
|
atomic_dec(&dev->active_tx_urbs);
|
|
|
|
if (err == -ENODEV) {
|
|
netif_device_detach(netdev);
|
|
} else {
|
|
netdev_warn(netdev, "failed tx_urb %d\n", err);
|
|
|
|
stats->tx_dropped++;
|
|
}
|
|
} else {
|
|
netif_trans_update(netdev);
|
|
|
|
/* Slow down tx path */
|
|
if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
|
|
dev->free_slots < CPC_TX_QUEUE_TRIGGER_LOW) {
|
|
netif_stop_queue(netdev);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release our reference to this URB, the USB core will eventually free
|
|
* it entirely.
|
|
*/
|
|
usb_free_urb(urb);
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
nomem:
|
|
dev_kfree_skb(skb);
|
|
stats->tx_dropped++;
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static int ems_usb_close(struct net_device *netdev)
|
|
{
|
|
struct ems_usb *dev = netdev_priv(netdev);
|
|
|
|
/* Stop polling */
|
|
unlink_all_urbs(dev);
|
|
|
|
netif_stop_queue(netdev);
|
|
|
|
/* Set CAN controller to reset mode */
|
|
if (ems_usb_write_mode(dev, SJA1000_MOD_RM))
|
|
netdev_warn(netdev, "couldn't stop device");
|
|
|
|
close_candev(netdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops ems_usb_netdev_ops = {
|
|
.ndo_open = ems_usb_open,
|
|
.ndo_stop = ems_usb_close,
|
|
.ndo_start_xmit = ems_usb_start_xmit,
|
|
.ndo_change_mtu = can_change_mtu,
|
|
};
|
|
|
|
static const struct can_bittiming_const ems_usb_bittiming_const = {
|
|
.name = "ems_usb",
|
|
.tseg1_min = 1,
|
|
.tseg1_max = 16,
|
|
.tseg2_min = 1,
|
|
.tseg2_max = 8,
|
|
.sjw_max = 4,
|
|
.brp_min = 1,
|
|
.brp_max = 64,
|
|
.brp_inc = 1,
|
|
};
|
|
|
|
static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode)
|
|
{
|
|
struct ems_usb *dev = netdev_priv(netdev);
|
|
|
|
switch (mode) {
|
|
case CAN_MODE_START:
|
|
if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL))
|
|
netdev_warn(netdev, "couldn't start device");
|
|
|
|
if (netif_queue_stopped(netdev))
|
|
netif_wake_queue(netdev);
|
|
break;
|
|
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ems_usb_set_bittiming(struct net_device *netdev)
|
|
{
|
|
struct ems_usb *dev = netdev_priv(netdev);
|
|
struct can_bittiming *bt = &dev->can.bittiming;
|
|
u8 btr0, btr1;
|
|
|
|
btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
|
|
btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
|
|
(((bt->phase_seg2 - 1) & 0x7) << 4);
|
|
if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
|
|
btr1 |= 0x80;
|
|
|
|
netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
|
|
|
|
dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0;
|
|
dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1;
|
|
|
|
return ems_usb_command_msg(dev, &dev->active_params);
|
|
}
|
|
|
|
static void init_params_sja1000(struct ems_cpc_msg *msg)
|
|
{
|
|
struct cpc_sja1000_params *sja1000 =
|
|
&msg->msg.can_params.cc_params.sja1000;
|
|
|
|
msg->type = CPC_CMD_TYPE_CAN_PARAMS;
|
|
msg->length = sizeof(struct cpc_can_params);
|
|
msg->msgid = 0;
|
|
|
|
msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000;
|
|
|
|
/* Acceptance filter open */
|
|
sja1000->acc_code0 = 0x00;
|
|
sja1000->acc_code1 = 0x00;
|
|
sja1000->acc_code2 = 0x00;
|
|
sja1000->acc_code3 = 0x00;
|
|
|
|
/* Acceptance filter open */
|
|
sja1000->acc_mask0 = 0xFF;
|
|
sja1000->acc_mask1 = 0xFF;
|
|
sja1000->acc_mask2 = 0xFF;
|
|
sja1000->acc_mask3 = 0xFF;
|
|
|
|
sja1000->btr0 = 0;
|
|
sja1000->btr1 = 0;
|
|
|
|
sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL;
|
|
sja1000->mode = SJA1000_MOD_RM;
|
|
}
|
|
|
|
/*
|
|
* probe function for new CPC-USB devices
|
|
*/
|
|
static int ems_usb_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct net_device *netdev;
|
|
struct ems_usb *dev;
|
|
int i, err = -ENOMEM;
|
|
|
|
netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
|
|
if (!netdev) {
|
|
dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev = netdev_priv(netdev);
|
|
|
|
dev->udev = interface_to_usbdev(intf);
|
|
dev->netdev = netdev;
|
|
|
|
dev->can.state = CAN_STATE_STOPPED;
|
|
dev->can.clock.freq = EMS_USB_ARM7_CLOCK;
|
|
dev->can.bittiming_const = &ems_usb_bittiming_const;
|
|
dev->can.do_set_bittiming = ems_usb_set_bittiming;
|
|
dev->can.do_set_mode = ems_usb_set_mode;
|
|
dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
|
|
|
|
netdev->netdev_ops = &ems_usb_netdev_ops;
|
|
|
|
netdev->flags |= IFF_ECHO; /* we support local echo */
|
|
|
|
init_usb_anchor(&dev->rx_submitted);
|
|
|
|
init_usb_anchor(&dev->tx_submitted);
|
|
atomic_set(&dev->active_tx_urbs, 0);
|
|
|
|
for (i = 0; i < MAX_TX_URBS; i++)
|
|
dev->tx_contexts[i].echo_index = MAX_TX_URBS;
|
|
|
|
dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!dev->intr_urb) {
|
|
dev_err(&intf->dev, "Couldn't alloc intr URB\n");
|
|
goto cleanup_candev;
|
|
}
|
|
|
|
dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL);
|
|
if (!dev->intr_in_buffer)
|
|
goto cleanup_intr_urb;
|
|
|
|
dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE +
|
|
sizeof(struct ems_cpc_msg), GFP_KERNEL);
|
|
if (!dev->tx_msg_buffer)
|
|
goto cleanup_intr_in_buffer;
|
|
|
|
usb_set_intfdata(intf, dev);
|
|
|
|
SET_NETDEV_DEV(netdev, &intf->dev);
|
|
|
|
init_params_sja1000(&dev->active_params);
|
|
|
|
err = ems_usb_command_msg(dev, &dev->active_params);
|
|
if (err) {
|
|
netdev_err(netdev, "couldn't initialize controller: %d\n", err);
|
|
goto cleanup_tx_msg_buffer;
|
|
}
|
|
|
|
err = register_candev(netdev);
|
|
if (err) {
|
|
netdev_err(netdev, "couldn't register CAN device: %d\n", err);
|
|
goto cleanup_tx_msg_buffer;
|
|
}
|
|
|
|
return 0;
|
|
|
|
cleanup_tx_msg_buffer:
|
|
kfree(dev->tx_msg_buffer);
|
|
|
|
cleanup_intr_in_buffer:
|
|
kfree(dev->intr_in_buffer);
|
|
|
|
cleanup_intr_urb:
|
|
usb_free_urb(dev->intr_urb);
|
|
|
|
cleanup_candev:
|
|
free_candev(netdev);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* called by the usb core when the device is removed from the system
|
|
*/
|
|
static void ems_usb_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct ems_usb *dev = usb_get_intfdata(intf);
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
if (dev) {
|
|
unregister_netdev(dev->netdev);
|
|
free_candev(dev->netdev);
|
|
|
|
unlink_all_urbs(dev);
|
|
|
|
usb_free_urb(dev->intr_urb);
|
|
|
|
kfree(dev->intr_in_buffer);
|
|
}
|
|
}
|
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */
|
|
static struct usb_driver ems_usb_driver = {
|
|
.name = "ems_usb",
|
|
.probe = ems_usb_probe,
|
|
.disconnect = ems_usb_disconnect,
|
|
.id_table = ems_usb_table,
|
|
};
|
|
|
|
module_usb_driver(ems_usb_driver);
|