/* ssv.c * Linux CAN-bus device driver. * Written by Arnaud Westenberg email:arnaud@casema.net * 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/ssv.h" #include "../include/i82527.h" int ssvcan_irq[2]={-1,-1}; unsigned long ssvcan_base=0x0; static can_spinlock_t ssv_port_lock=SPIN_LOCK_UNLOCKED; /* IO_RANGE is the io-memory range that gets reserved, please adjust according * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or * #define IO_RANGE 0x20 for sja1000 chips. */ #define IO_RANGE 0x04 /* The function template_request_io is used to reserve the io-memory. If your * hardware uses a dedicated memory range as hardware control registers you * will have to add the code to reserve this memory as well. * The reserved memory starts at io_addr, wich is the module parameter io. */ int ssv_request_io(struct candevice_t *candev) { if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) { CANMSG("Unable to open port: 0x%lx\n",candev->io_addr); return -ENODEV; } else { DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr, candev->io_addr + IO_RANGE - 1); } return 0; } /* The function template_release_io is used to free the previously reserved * io-memory. In case you reserved more memory, don't forget to free it here. */ int ssv_release_io(struct candevice_t *candev) { can_release_io_region(candev->io_addr,IO_RANGE); return 0; } /* The function template_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. */ int ssv_reset(struct candevice_t *candev) { int i; DEBUGMSG("Resetting ssv hardware ...\n"); ssv_write_register(1,ssvcan_base+iCPU); ssv_write_register(0,ssvcan_base+iCPU); ssv_write_register(1,ssvcan_base+0x100+iCPU); ssv_write_register(0,ssvcan_base+0x100+iCPU); for (i = 1; i < 1000; i++) udelay (1000); /* Check hardware reset status */ i=0; while ( (ssv_read_register(ssvcan_base+iCPU) & iCPU_RST) && (i<=15)) { udelay(20000); i++; } if (i>=15) { CANMSG("Reset status timeout!\n"); CANMSG("Please check your hardware.\n"); return -ENODEV; } else DEBUGMSG("Chip0 reset status ok.\n"); /* Check hardware reset status */ i=0; while ( (ssv_read_register(ssvcan_base+0x100+iCPU) & iCPU_RST) && (i<=15)) { udelay(20000); i++; } if (i>=15) { CANMSG("Reset status timeout!\n"); CANMSG("Please check your hardware.\n"); return -ENODEV; } else DEBUGMSG("Chip1 reset status ok.\n"); return 0; } /* The function template_init_hw_data is used to initialize the hardware * structure containing information about the installed CAN-board. * RESET_ADDR represents the io-address of the hardware reset register. * NR_82527 represents the number of intel 82527 chips on the board. * NR_SJA1000 represents the number of philips sja1000 chips on the board. * The flags entry can currently only be CANDEV_PROGRAMMABLE_IRQ to indicate that * the hardware uses programmable interrupts. */ #define RESET_ADDR 0x02 #define NR_82527 2 #define NR_SJA1000 0 int ssv_init_hw_data(struct candevice_t *candev) { candev->res_addr=RESET_ADDR; candev->nr_82527_chips=NR_82527; candev->nr_sja1000_chips=0; candev->nr_all_chips=NR_82527; candev->flags |= CANDEV_PROGRAMMABLE_IRQ; return 0; } /* The function template_init_chip_data is used to initialize the hardware * structure containing information about the CAN chips. * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or * "sja1000". * 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 argument holds the chip clock value in Hz. */ int ssv_init_chip_data(struct candevice_t *candev, int chipnr) { i82527_fill_chipspecops(candev->chip[chipnr]); candev->chip[chipnr]->chip_base_addr= candev->io_addr+0x100*chipnr; candev->chip[chipnr]->clock = 16000000; ssvcan_irq[chipnr]=candev->chip[chipnr]->chip_irq; ssvcan_base=candev->io_addr; candev->chip[chipnr]->int_cpu_reg = iCPU_DSC; candev->chip[chipnr]->int_clk_reg = iCLK_SL1; candev->chip[chipnr]->int_bus_reg = iBUS_CBY; return 0; } /* The function template_init_obj_data is used to initialize the hardware * structure containing information about the different message objects on the * CAN chip. In case of the sja1000 there's only one message object but on the * i82527 chip there are 15. * The code below is for a i82527 chip and initializes the object base addresses * The entry obj_base_addr represents the first memory address of the message * object. In case of the sja1000 obj_base_addr is taken the same as the chips * base address. * Unless the hardware uses a segmented memory map, flags can be set zero. */ int ssv_init_obj_data(struct canchip_t *chip, int objnr) { chip->msgobj[objnr]->obj_base_addr= chip->chip_base_addr+(objnr+1)*0x10; return 0; } /* The function template_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. */ int ssv_program_irq(struct candevice_t *candev) { return 0; } /* The function template_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. */ void ssv_write_register(unsigned data, unsigned long address) { /* address is an absolute address */ /* the ssv card has two registers, the address register at 0x0 and the data register at 0x01 */ /* write the relative address on the eight LSB bits and the data on the eight MSB bits in one time */ if((address-ssvcan_base)<0x100) outw(address-ssvcan_base + (256 * data), ssvcan_base); else outw(address-ssvcan_base-0x100 + (256 * data), ssvcan_base+0x02); } /* The function template_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. */ unsigned ssv_read_register(unsigned long address) { /* this is the same thing that the function write_register. We use the two register, we write the address where we want to read in a first time. In a second time we read the data */ unsigned char ret; can_spin_irqflags_t flags; if((address-ssvcan_base)<0x100) { can_spin_lock_irqsave(&ssv_port_lock,flags); outb(address-ssvcan_base, ssvcan_base); ret=inb(ssvcan_base+1); can_spin_unlock_irqrestore(&ssv_port_lock,flags); } else { can_spin_lock_irqsave(&ssv_port_lock,flags); outb(address-ssvcan_base-0x100, ssvcan_base+0x02); ret=inb(ssvcan_base+1+0x02); can_spin_unlock_irqrestore(&ssv_port_lock,flags); } return ret; } /* !!! Don't change this function !!! */ int ssv_register(struct hwspecops_t *hwspecops) { hwspecops->request_io = ssv_request_io; hwspecops->release_io = ssv_release_io; hwspecops->reset = ssv_reset; hwspecops->init_hw_data = ssv_init_hw_data; hwspecops->init_chip_data = ssv_init_chip_data; hwspecops->init_obj_data = ssv_init_obj_data; hwspecops->write_register = ssv_write_register; hwspecops->read_register = ssv_read_register; hwspecops->program_irq = ssv_program_irq; return 0; }