-/* i82527.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
- * email:pisa@cmp.felk.cvut.cz
- * This software is released under the GPL-License.
- * Version lincan-0.3 17 Jun 2004
- */
+/**************************************************************************/
+/* File: i82527.c - Intel i82527 CAN controller support */
+/* */
+/* LinCAN - (Not only) Linux CAN bus driver */
+/* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz> */
+/* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz> */
+/* Funded by OCERA and FRESCOR IST projects */
+/* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl> */
+/* */
+/* LinCAN is free software; you can redistribute it and/or modify it */
+/* under terms of the GNU General Public License as published by the */
+/* Free Software Foundation; either version 2, or (at your option) any */
+/* later version. LinCAN 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 LinCAN; see file */
+/* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
+/* Cambridge, MA 02139, USA. */
+/* */
+/* To allow use of LinCAN in the compact embedded systems firmware */
+/* and RT-executives (RTEMS for example), main authors agree with next */
+/* special exception: */
+/* */
+/* Including LinCAN header files in a file, instantiating LinCAN generics */
+/* or templates, or linking other files with LinCAN objects to produce */
+/* an application image/executable, does not by itself cause the */
+/* resulting application image/executable to be covered by */
+/* the GNU General Public License. */
+/* This exception does not however invalidate any other reasons */
+/* why the executable file might be covered by the GNU Public License. */
+/* Publication of enhanced or derived LinCAN files is required although. */
+/**************************************************************************/
#include "../include/can.h"
#include "../include/can_sysdep.h"
if (i82527_enable_configuration(chip))
return -ENODEV;
- clock /=2;
+ if(chip->int_cpu_reg & iCPU_DSC)
+ clock /=2;
/* tseg even = round down, odd = round up */
for (tseg=(0+0+2)*2; tseg<=(MAX_TSEG2+MAX_TSEG1+2)*2+1; tseg++) {
DEBUGMSG("Cleared all message objects on chip\n");
- for (i=1; i<=15; i++) {
+ for (i=0; i<chip->max_objects; i++) {
obj=chip->msgobj[i];
canobj_write_reg(chip,obj,(INTPD_RES|RXIE_RES|TXIE_RES|MVAL_RES),iMSGCTL0);
canobj_write_reg(chip,obj,(NEWD_RES|MLST_RES|TXRQ_RES|RMPD_RES), iMSGCTL1);
return 0;
}
+int i82527_attach_to_chip(struct canchip_t *chip)
+{
+ return 0;
+}
+
+int i82527_release_chip(struct canchip_t *chip)
+{
+ i82527_stop_chip(chip);
+ can_write_reg(chip, (iCTL_CCE|iCTL_INI), iCTL);
+
+ return 0;
+}
+
static inline
void i82527_irq_write_handler(struct canchip_t *chip, struct msgobj_t *obj)
{
i82527_pre_read_config(chip, obj);
- CANMSG("i82527_irq_update_filter: obj at 0x%08lx\n",obj->obj_base_addr);
+ CANMSG("i82527_irq_update_filter: obj at 0x%08lx\n",
+ can_ioptr2ulong(obj->obj_base_addr));
}
}
-void i82527_irq_sync_activities(struct canchip_t *chip, struct msgobj_t *obj)
+int i82527_irq_sync_activities(struct canchip_t *chip, struct msgobj_t *obj)
{
+ int job_done=0;
+
while(!can_msgobj_test_and_set_fl(obj,TX_LOCK)) {
if(can_msgobj_test_and_clear_fl(obj,TX_REQUEST)) {
}
}
+ job_done=1;
+
+ mb();
+
can_msgobj_clear_fl(obj,TX_LOCK);
if(can_msgobj_test_fl(obj,TX_REQUEST))
continue;
continue;
break;
}
+
+ return job_done;
}
int i82527_irq_handler(int irq, struct canchip_t *chip)
unsigned char msgcfg;
unsigned irq_register;
+ unsigned status_register;
unsigned object;
struct msgobj_t *obj;
+ int loop_cnt=CHIP_MAX_IRQLOOP;
/*put_reg=device->hwspecops->write_register;*/
/*get_reg=device->hwspecops->read_register;*/
do {
+ if(!loop_cnt--) {
+ CANMSG("i82527_irq_handler IRQ %d stuck\n",irq);
+ CANMSG("i82527_irq_register 0x%x\n",irq_register);
+ return CANCHIP_IRQ_STUCK;
+ }
+
DEBUGMSG("i82527: iIRQ 0x%02x\n",irq_register);
if (irq_register == 0x01) {
- DEBUGMSG("Status register: 0x%x\n",can_read_reg(chip, iSTAT));
+ status_register=can_read_reg(chip, iSTAT);
+ CANMSG("Status register: 0x%x\n",status_register);
continue;
/*return CANCHIP_IRQ_NONE;*/
}
if (irq_register == 0x02)
object = 14;
- else if(irq_register < 14)
+ else if(irq_register <= 13+3)
object = irq_register-3;
else
return CANCHIP_IRQ_NONE;
can_msgobj_set_fl(obj,TX_REQUEST);
/* calls i82527_irq_write_handler synchronized with other invocations */
- i82527_irq_sync_activities(chip, obj);
+ if(i82527_irq_sync_activities(chip, obj)<=0){
+ /* The interrupt has to be cleared anyway */
+ canobj_write_reg(chip,obj,(MVAL_UNC|TXIE_UNC|RXIE_UNC|INTPD_RES),iMSGCTL0);
+
+ /*
+ * Rerun for case, that parallel activity on SMP or fully-preemptive
+ * kernel result in preparation and finished sending of message
+ * between above if and canobj_write_reg.
+ */
+ i82527_irq_sync_activities(chip, obj);
+ }
}
else {
i82527_irq_read_handler(chip, obj, object);
}
-
+
} while((irq_register=i82527_seg_read_reg(chip, iIRQ)) != 0);
return CANCHIP_IRQ_HANDLED;
chipspecops->enable_configuration = i82527_enable_configuration;
chipspecops->disable_configuration = i82527_disable_configuration;
chipspecops->set_btregs = i82527_set_btregs;
+ chipspecops->attach_to_chip = i82527_attach_to_chip;
+ chipspecops->release_chip = i82527_release_chip;
chipspecops->start_chip = i82527_start_chip;
chipspecops->stop_chip = i82527_stop_chip;
chipspecops->irq_handler = i82527_irq_handler;
+ chipspecops->irq_accept = NULL;
return 0;
}
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