--- /dev/null
+/* sysdep_lnx.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
+ */
+
+#include "../include/can.h"
+#include "../include/can_sysdep.h"
+#include "../include/main.h"
+#include "../include/devcommon.h"
+#include "../include/setup.h"
+#include "../include/finish.h"
+
+#ifdef CAN_ENABLE_VME_SUPPORT
+#include "ca91c042.h"
+/* Modified version of ca91c042 driver can be found in
+ * components/comm/contrib directory. */
+#endif
+
+
+/**
+ * can_checked_malloc - memory allocation with registering of requested blocks
+ * @size: size of the requested block
+ *
+ * The function is used in the driver initialization phase to catch possible memory
+ * leaks for future driver finalization or case, that driver initialization fail.
+ *
+ * Return Value: pointer to the allocated memory or NULL in the case of fail
+ */
+void *can_checked_malloc(size_t size)
+{
+ struct mem_addr *mem_new;
+ void *address_p;
+
+ address_p=kmalloc(size,GFP_KERNEL);
+ if(address_p == NULL) {
+ CANMSG("can_checked_malloc: out of the memory\n");
+ return NULL;
+ }
+
+#ifdef DEBUG_MEM
+ DEBUGMSG("can_checked_malloc: allocated %d bytes at %p, mem_head=%p\n",
+ (int)size, address_p, mem_head);
+#endif
+
+ mem_new=(struct mem_addr *)kmalloc(sizeof(struct mem_addr),GFP_KERNEL);
+ if (mem_new == NULL) {
+ CANMSG("can_checked_malloc: memory list allocation error.\n");
+ kfree(address_p);
+ return NULL;
+ }
+ mem_new->next=mem_head;
+ mem_new->address=address_p;
+ mem_new->size=size;
+ mem_head=mem_new;
+
+ return address_p;
+}
+
+/**
+ * can_checked_free - free memory allocated by can_checked_malloc()
+ * @address_p: pointer to the memory block
+ */
+int can_checked_free(void *address_p)
+{
+ struct mem_addr **mem_pptr;
+ struct mem_addr *mem_del=NULL;
+
+#ifdef DEBUG_MEM
+ DEBUGMSG("can_checked_free %p, mem_head=%p\n", address_p, mem_head);
+#endif
+
+ for(mem_pptr = &mem_head; (mem_del = *mem_pptr); mem_pptr = &mem_del->next) {
+ if (mem_del->address != address_p)
+ continue;
+ *mem_pptr=mem_del->next;
+ kfree(mem_del);
+ kfree(address_p);
+ return 0;
+ }
+
+ CANMSG("can_checked_free: address %p not found on the mem list\n", address_p);
+
+ kfree(address_p);
+ return -1;
+}
+
+
+/**
+ * can_del_mem_list - check for stale memory allocations at driver finalization
+ *
+ * Checks, if there are still some memory blocks allocated and releases memory
+ * occupied by such blocks back to the system
+ */
+int can_del_mem_list(void)
+{
+ struct mem_addr *mem;
+
+#ifdef DEBUG_MEM
+ DEBUGMSG("can_del_mem_list, mem_head=%p\n", mem_head);
+#endif
+ if(mem_head == NULL) {
+ CANMSG("can_del_mem_list: no entries on the list - OK\n");
+ return 0;
+ }
+
+ while((mem=mem_head) != NULL) {
+ mem_head=mem->next;
+ CANMSG("can_del_mem_list: deleting %p with size %d\n",
+ mem->address, (int)mem->size);
+ kfree(mem->address);
+ kfree(mem);
+ }
+
+ return 0;
+}
+
+/**
+ * can_request_io_region - request IO space region
+ * @start: the first IO port address
+ * @n: number of the consecutive IO port addresses
+ * @name: name/label for the requested region
+ *
+ * The function hides system specific implementation of the feature.
+ *
+ * Return Value: returns positive value (1) in the case, that region could
+ * be reserved for the driver. Returns zero (0) if there is collision with
+ * other driver or region cannot be taken for some other reason.
+ */
+int can_request_io_region(unsigned long start, unsigned long n, const char *name)
+{
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
+ if(check_region(start,n)) return 0;
+ request_region(start,n,name);
+ return 1;
+ #else
+ return (request_region(start,n,name))?1:0;
+ #endif
+}
+
+/**
+ * can_release_io_region - release IO space region
+ * @start: the first IO port address
+ * @n: number of the consecutive IO port addresses
+ */
+void can_release_io_region(unsigned long start, unsigned long n)
+{
+ release_region(start,n);
+}
+
+/**
+ * can_request_mem_region - request memory space region
+ * @start: the first memory port physical address
+ * @n: number of the consecutive memory port addresses
+ * @name: name/label for the requested region
+ *
+ * The function hides system specific implementation of the feature.
+ *
+ * Return Value: returns positive value (1) in the case, that region could
+ * be reserved for the driver. Returns zero (0) if there is collision with
+ * other driver or region cannot be taken for some other reason.
+ */
+int can_request_mem_region(unsigned long start, unsigned long n, const char *name)
+{
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
+ return 1;
+ #else
+ return (request_mem_region(start,n,name))?1:0;
+ #endif
+}
+
+/**
+ * can_release_mem_region - release memory space region
+ * @start: the first memory port physical address
+ * @n: number of the consecutive memory port addresses
+ */
+void can_release_mem_region(unsigned long start, unsigned long n)
+{
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
+ return;
+ #else
+ release_mem_region(start,n);
+ #endif
+}
+
+#ifndef CAN_WITH_RTL
+
+/**
+ * can_default_irq_dispatch - the first level interrupt dispatch handler
+ * @irq: interrupt vector number, this value is system specific
+ * @dev_id: driver private pointer registered at time of request_irq() call.
+ * The CAN driver uses this pointer to store relationship of interrupt
+ * to chip state structure - @struct canchip_t
+ * @regs: system dependent value pointing to registers stored in exception frame
+ *
+ * File: src/setup.c
+ */
+can_irqreturn_t can_default_irq_dispatch(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int retval;
+ struct canchip_t *chip=(struct canchip_t *)dev_id;
+
+ retval=chip->chipspecops->irq_handler(irq, chip);
+ return CAN_IRQ_RETVAL(retval);
+}
+
+/**
+ * can_chip_setup_irq - attaches chip to the system interrupt processing
+ * @chip: pointer to CAN chip structure
+ *
+ * Return Value: returns negative number in the case of fail
+ */
+int can_chip_setup_irq(struct canchip_t *chip)
+{
+ if(chip==NULL)
+ return -1;
+ if(!chip->chipspecops->irq_handler)
+ return 0;
+ if(chip->flags & CHIP_IRQ_CUSTOM)
+ return 1;
+
+ if ((chip->flags & CHIP_IRQ_VME) == 0) {
+ if (request_irq(chip->chip_irq,can_default_irq_dispatch,SA_SHIRQ,DEVICE_NAME,chip))
+ return -1;
+ else {
+ DEBUGMSG("Registered interrupt %d\n",chip->chip_irq);
+ chip->flags |= CHIP_IRQ_SETUP;
+ }
+ } else {
+#ifdef CAN_ENABLE_VME_SUPPORT
+ if (chip->chip_irq < 1 || chip->chip_irq > 255) {
+ CANMSG("Bad irq parameter. (1 <= irq <= 255).\n");
+ return -EINVAL;
+ }
+
+ request_vmeirq(chip->chip_irq, can_default_irq_dispatch, chip);
+ DEBUGMSG("Registered VME interrupt vector %d\n",chip->chip_irq);
+ chip->flags |= CHIP_IRQ_SETUP;
+#endif
+ }
+ return 1;
+}
+
+
+/**
+ * can_chip_free_irq - unregisters chip interrupt handler from the system
+ * @chip: pointer to CAN chip structure
+ */
+void can_chip_free_irq(struct canchip_t *chip)
+{
+ if((chip->flags & CHIP_IRQ_SETUP) && (chip->chip_irq>=0)) {
+ if(chip->flags & CHIP_IRQ_CUSTOM)
+ return;
+
+ if ((chip->flags & CHIP_IRQ_VME) == 0)
+ free_irq(chip->chip_irq, chip);
+ else {
+#ifdef CAN_ENABLE_VME_SUPPORT
+ free_vmeirq(chip->chip_irq);
+#endif
+ }
+ chip->flags &= ~CHIP_IRQ_SETUP;
+ }
+}
+
+#endif /*CAN_WITH_RTL*/
projects / lincan.git / commitdiff