--- /dev/null
+/* ns_dev_can.c - FPGA version of C_CAN ARM device specific code
+ * Linux CAN-bus device driver.
+ * Written by Sebastian Stolzenberg email:stolzi@sebastian-stolzenberg.de
+ * Based on code from Arnaud Westenberg email:arnaud@wanadoo.nl
+ * and Ake Hedman, eurosource, akhe@eurosource.se
+ * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
+ * Ported to FS Forth-Systeme GmbH A9M9750DEVx development boards
+ * email:nbryan@embebidos.com
+ * This software is released under the GPL-License.
+ * Version lincan-0.3 17 Jun 2004
+ * This port 19 May 2005
+ *
+ */
+
+#include <linux/delay.h>
+
+#include "../include/can.h"
+#include "../include/can_sysdep.h"
+#include "../include/main.h"
+#include "../include/c_can.h"
+#include "../include/ns_dev_can.h"
+
+/*
+ * IO range for the C_CAN 1.2 memory map is 0x100 (256bytes)
+ */
+#define IO_RANGE 0x100
+
+/**
+ * ns_dev_request_io: - reserve io or memory range for can board
+ * @candev: pointer to candevice/board which asks for io. Field @io_addr
+ * of @candev is used in most cases to define start of the range
+ *
+ */
+int ns_dev_request_io(struct candevice_t *candev)
+{
+ /* Note hard-coded index for the chip number as this
+ * only supports a single instance of the C_CAN controller.
+ */
+ DEBUGMSG("(c%d)ns_dev_request_io (...)\n", candev->chip[0]->chip_idx);
+
+ if (!can_request_mem_region(candev->io_addr, IO_RANGE, DEVICE_NAME)) {
+ CANMSG("ns_dev failed to mem region %lx.\n",
+ (unsigned long)candev->io_addr);
+ }
+
+ if (!(candev->dev_base_addr = (long)ioremap(candev->io_addr, IO_RANGE))) {
+ DEBUGMSG
+ ("Failed to map IO-memory: 0x%lx - 0x%lx, mapped to 0x%lx\n",
+ (unsigned long)candev->io_addr,
+ (unsigned long)candev->io_addr + IO_RANGE - 1,
+ (unsigned long)candev->dev_base_addr);
+ can_release_mem_region(candev->io_addr, IO_RANGE);
+ return -ENODEV;
+ } else {
+
+ DEBUGMSG("Mapped IO-memory: 0x%lx - 0x%lx, mapped to 0x%lx\n",
+ (unsigned long)candev->io_addr,
+ (unsigned long)candev->io_addr + IO_RANGE - 1,
+ (unsigned long)candev->dev_base_addr);
+
+ }
+
+ candev->chip[0]->chip_base_addr = candev->dev_base_addr;
+ candev->chip[0]->chipspecops->start_chip(candev->chip[0]);
+
+ return 0;
+}
+
+/**
+ * ns_dev_release_io - free reserved io memory range
+ * @candev: pointer to candevice/board which releases io
+ *
+ * The function ns_dev_release_io() is used to free reserved io-memory.
+ * In case you have reserved more io memory, don't forget to free it here.
+ *
+ */
+int ns_dev_release_io(struct candevice_t *candev)
+{
+ u16 tempReg;
+ int i;
+
+ DEBUGMSG("(c%d)ns_dev_release_io (...)\n", candev->chip[0]->chip_idx);
+
+ /* Release I/O memory mapping */
+ iounmap((void *)candev->dev_base_addr);
+
+ /* Release the memory region */
+ can_release_mem_region(candev->io_addr, IO_RANGE);
+
+ return 0;
+}
+
+/**
+ * ns_dev_reset - hardware reset routine
+ * @card: Number of the hardware card.
+ *
+ * The function ns_dev_reset() is used to give a hardware reset. This is
+ * rather hardware specific so I haven't included example code. Don't forget to
+ * check the reset status of the chip before returning.
+ * Return Value: The function returns zero on success or %-ENODEV on failure
+ *
+ */
+int ns_dev_reset(struct candevice_t *candev)
+{
+ int i = 0;
+ int enableTest = 0;
+ int disableTest = 0;
+
+ struct canchip_t *pchip = candev->chip[0];
+
+ enableTest = pchip->chipspecops->enable_configuration(pchip);
+ disableTest = pchip->chipspecops->disable_configuration(pchip);
+
+ if (enableTest || disableTest) {
+ CANMSG("Enable or Disable status failed!\n");
+ CANMSG("Please check your hardware.\n");
+ return -ENODEV;
+ }
+
+ /* Check busoff status */
+ while ((c_can_read_reg_w(pchip, CCSR) & SR_BOFF) && (i <= 15)) {
+ udelay(2000);
+ i++;
+ }
+
+ if (i >= 15) {
+ CANMSG("Reset status timeout!\n");
+ CANMSG("Please check your hardware.\n");
+ return -ENODEV;
+ }
+ //pchip->config_irqs(pchip, CR_MIE | CR_SIE | CR_EIE);
+ return 0;
+}
+
+#define RESET_ADDR 0x0
+#define NR_C_CAN 1
+#define NR_MSGOBJ 32
+
+/**
+ * ns_dev_hw_data - Initialize hardware cards
+ * @candev: Pointer to candevice/board structure
+ *
+ * The function ns_dev_init_hw_data() is used to initialize the hardware
+ * structure containing information about the installed CAN-board.
+ * The flags entry can currently only be %CANDEV_PROGRAMMABLE_IRQ to indicate that
+ * the hardware uses programmable interrupts.
+ * Return Value: The function always returns zero
+ */
+int ns_dev_init_hw_data(struct candevice_t *candev)
+{
+ u32 sys_contVA = 0;
+
+ /* LUCAN : Magic numbers */
+ if (!(sys_contVA = (u32) ioremap(NS9750_PERIPHERAL_BASE_ADDRESS,
+ NS9750_PERIPHERAL_MAP_SIZE))) {
+ DEBUGMSG("Failed to map FPGA memory\n");
+ return -EIO;
+ } else {
+ DEBUGMSG("Writing to NS9750 sys cont\n");
+ writel((BUS_WIDTH_16BIT | ACTIVE_LOW_CHIP_SELECT),
+ sys_contVA + NS9750_SYSTEM_CONTROLLER_OFFSET);
+ }
+
+ /* We have finished with this mapping */
+ iounmap((void *)sys_contVA);
+
+ candev->nr_82527_chips = 0;
+ candev->nr_sja1000_chips = 0;
+ candev->nr_all_chips = NR_C_CAN;
+ candev->flags |= CANDEV_PROGRAMMABLE_IRQ;
+
+ return 0;
+}
+
+/**
+ * ns_dev_init_chip_data - Initialize chips
+ * @candev: Pointer to candevice/board structure
+ * @chipnr: Number of the CAN chip on the hardware card
+ *
+ * The function ns_dev_init_chip_data() is used to initialize the hardware
+ * structure containing information about the CAN chips.
+ * %CHIP_TYPE represents the type of CAN chip.
+ * The @chip_base_addr entry represents the start of the 'official' memory map
+ * of the installed chip. It's likely that this is the same as the @io_addr
+ * argument supplied at module loading time.
+ * The @clock entry holds the chip clock value in Hz.
+ * File: src/template.c
+ */
+int ns_dev_init_chip_data(struct candevice_t *candev, int chipnr)
+{
+ /* Register chip operations */
+ c_can_fill_chipspecops(candev->chip[chipnr]);
+
+ /* override chip provided default value */
+ candev->chip[chipnr]->max_objects = MAX_MSGOBJS;
+ candev->chip[chipnr]->chip_base_addr = candev->io_addr;
+ candev->chip[chipnr]->clock = C_CAN_CLOCK_INPUT_FREQUENCY;
+
+ return 0;
+}
+
+/**
+ * ns_dev_init_obj_data - Initialize message buffers
+ * @chip: Pointer to chip specific structure
+ * @objnr: Number of the message buffer
+ *
+ * The function ns_dev_init_obj_data() is used to initialize the hardware
+ * structure containing information about the different message objects on the
+ * CAN chip.
+ * The entry @obj_base_addr represents the first memory address of the message
+ * object.
+ * Unless the hardware uses a segmented memory map, flags can be set zero.
+ * Return Value: The function always returns zero
+ * File: src/template.c
+ */
+int ns_dev_init_obj_data(struct canchip_t *chip, int objnr)
+{
+
+ DEBUGMSG("(c%d)calling ns_dev_init_obj_data( ...)\n", chip->chip_idx);
+
+ /* It seems, that there is no purpose to setup object base address */
+ chip->msgobj[objnr]->obj_base_addr = 0;
+
+ /*can_msgobj_test_fl(pmsgobj,RX_MODE_EXT); */
+ return 0;
+}
+
+/**
+ * ns_dev_write_register - Low level write register routine
+ * @data: data to be written
+ * @address: memory address to write to
+ *
+ * The function ns_dev_write_register() is used to write to hardware registers
+ * on the CAN chip. You should only have to edit this function if your hardware
+ * uses some specific write process.
+ * Return Value: The function does not return a value
+ * File: src/template.c
+ */
+void ns_dev_write_register(unsigned data, unsigned long address)
+{
+ int i;
+ //unsigned long usecs = 1;
+
+ writew(data, address);
+ //udelay( usecs );
+ for (i = 0; i < 5; i++) ;
+}
+
+/**
+ * ns_dev_read_register - Low level read register routine
+ * @address: memory address to read from
+ *
+ * The function ns_dev_read_register() is used to read from hardware registers
+ * on the CAN chip. You should only have to edit this function if your hardware
+ * uses some specific read process.
+ * Return Value: The function returns the value stored in @address
+ * File: src/template.c
+ */
+unsigned ns_dev_read_register(unsigned long address)
+{
+ u16 value, i;
+
+ value = readw(address);
+ //udelay( usecs );
+ for (i = 0; i < 5; i++) ;
+ value = readw(address);
+ //udelay( usecs );
+ for (i = 0; i < 5; i++) ;
+
+ return value;
+}
+
+/**
+ * ns_dev_program_irq - program interrupts
+ * @candev: Pointer to candevice/board structure
+ *
+ * The function ns_dev_program_irq() is used for hardware that uses
+ * programmable interrupts. If your hardware doesn't use programmable interrupts
+ * you should not set the @candevices_t->flags entry to %CANDEV_PROGRAMMABLE_IRQ and
+ * leave this function unedited. Again this function is hardware specific so
+ * there's no example code.
+ * Return value: The function returns zero on success or %-ENODEV on failure
+ * File: src/template.c
+ */
+int ns_dev_program_irq(struct candevice_t *candev)
+{
+ return 0;
+}
+
+int ns_dev_register(struct hwspecops_t *hwspecops)
+{
+ hwspecops->request_io = ns_dev_request_io;
+ hwspecops->release_io = ns_dev_release_io;
+ hwspecops->reset = ns_dev_reset;
+ hwspecops->init_hw_data = ns_dev_init_hw_data;
+ hwspecops->init_chip_data = ns_dev_init_chip_data;
+ hwspecops->init_obj_data = ns_dev_init_obj_data;
+ hwspecops->write_register = ns_dev_write_register;
+ hwspecops->read_register = ns_dev_read_register;
+ hwspecops->program_irq = ns_dev_program_irq;
+ return 0;
+}
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