2 * Linux CAN-bus device driver.
3 * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
4 * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
5 * email:pisa@cmp.felk.cvut.cz
6 * This software is released under the GPL-License.
7 * Version lincan-0.3 17 Jun 2004
10 #include "../include/can.h"
11 #include "../include/can_sysdep.h"
12 #include "../include/main.h"
13 #include "../include/nsi.h"
14 #include "../include/i82527.h"
17 unsigned long nsican_base=0x0;
19 static CAN_DEFINE_SPINLOCK(nsican_port_lock);
21 /* IO_RANGE is the io-memory range that gets reserved, please adjust according
22 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
23 * #define IO_RANGE 0x20 for sja1000 chips.
27 /* The function template_request_io is used to reserve the io-memory. If your
28 * hardware uses a dedicated memory range as hardware control registers you
29 * will have to add the code to reserve this memory as well.
30 * The reserved memory starts at candev->io_addr, wich is the module parameter io.
32 int nsi_request_io(struct candevice_t *candev)
35 if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) {
36 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
39 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr,
40 candev->io_addr + IO_RANGE - 1);
45 /* The function template_release_io is used to free the previously reserved
46 * io-memory. In case you reserved more memory, don't forget to free it here.
48 int nsi_release_io(struct candevice_t *candev)
51 can_release_io_region(candev->io_addr,IO_RANGE);
56 /* The function template_reset is used to give a hardware reset. This is rather
57 * hardware specific so I haven't included example code. Don't forget to check
58 * the reset status of the chip before returning.
60 int nsi_reset(struct candevice_t *candev)
64 DEBUGMSG("Resetting nsi hardware ...\n");
65 /* we don't use template_write_register because we don't use the two first
66 register of the card but the third in order to make a hard reset */
67 outb (1, nsican_base + candev->res_addr);
68 outb (0, nsican_base + candev->res_addr);
69 for (i = 1; i < 1000; i++)
73 /* Check hardware reset status */
75 while ( (nsi_read_register(nsican_base+iCPU) & iCPU_RST) && (i<=15)) {
80 CANMSG("Reset status timeout!\n");
81 CANMSG("Please check your hardware.\n");
85 DEBUGMSG("Chip0 reset status ok.\n");
90 /* The function template_init_hw_data is used to initialize the hardware
91 * structure containing information about the installed CAN-board.
92 * RESET_ADDR represents the io-address of the hardware reset register.
93 * NR_82527 represents the number of intel 82527 chips on the board.
94 * NR_SJA1000 represents the number of philips sja1000 chips on the board.
95 * The flags entry can currently only be CANDEV_PROGRAMMABLE_IRQ to indicate that
96 * the hardware uses programmable interrupts.
98 #define RESET_ADDR 0x02
102 int nsi_init_hw_data(struct candevice_t *candev)
104 candev->res_addr=RESET_ADDR;
105 candev->nr_82527_chips=1;
106 candev->nr_sja1000_chips=0;
107 candev->nr_all_chips=1;
108 candev->flags |= CANDEV_PROGRAMMABLE_IRQ;
113 /* The function template_init_chip_data is used to initialize the hardware
114 * structure containing information about the CAN chips.
115 * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or
117 * The chip_base_addr entry represents the start of the 'official' memory map
118 * of the installed chip. It's likely that this is the same as the candev->io_addr
119 * argument supplied at module loading time.
120 * The clock argument holds the chip clock value in Hz.
123 int nsi_init_chip_data(struct candevice_t *candev, int chipnr)
125 i82527_fill_chipspecops(candev->chip[chipnr]);
126 candev->chip[chipnr]->chip_base_addr=
128 candev->chip[chipnr]->clock = 16000000;
129 nsican_irq=candev->chip[chipnr]->chip_irq;
130 nsican_base=candev->chip[chipnr]->chip_base_addr;
131 candev->chip[chipnr]->int_cpu_reg = iCPU_DSC;
132 candev->chip[chipnr]->int_clk_reg = iCLK_SL1;
133 candev->chip[chipnr]->int_bus_reg = iBUS_CBY;
138 /* The function template_init_obj_data is used to initialize the hardware
139 * structure containing information about the different message objects on the
140 * CAN chip. In case of the sja1000 there's only one message object but on the
141 * i82527 chip there are 15.
142 * The code below is for a i82527 chip and initializes the object base addresses
143 * The entry obj_base_addr represents the first memory address of the message
144 * object. In case of the sja1000 obj_base_addr is taken the same as the chips
146 * Unless the hardware uses a segmented memory map, flags can be set zero.
148 int nsi_init_obj_data(struct canchip_t *chip, int objnr)
151 chip->msgobj[objnr]->obj_base_addr=
152 chip->chip_base_addr+(objnr+1)*0x10;
157 /* The function template_program_irq is used for hardware that uses programmable
158 * interrupts. If your hardware doesn't use programmable interrupts you should
159 * not set the candevices_t->flags entry to CANDEV_PROGRAMMABLE_IRQ and leave this
160 * function unedited. Again this function is hardware specific so there's no
163 int nsi_program_irq(struct candevice_t *candev)
168 /* The function template_write_register is used to write to hardware registers
169 * on the CAN chip. You should only have to edit this function if your hardware
170 * uses some specific write process.
172 void nsi_write_register(unsigned data, unsigned long address)
174 /* address is an absolute address */
176 /* the nsi card has two registers, the address register at 0x0
177 and the data register at 0x01 */
179 /* write the relative address on the eight LSB bits
180 and the data on the eight MSB bits in one time */
181 outw(address-nsican_base + (256 * data), nsican_base);
184 /* The function template_read_register is used to read from hardware registers
185 * on the CAN chip. You should only have to edit this function if your hardware
186 * uses some specific read process.
188 unsigned nsi_read_register(unsigned long address)
190 /* this is the same thing that the function write_register.
191 We use the two register, we write the address where we
192 want to read in a first time. In a second time we read the
195 can_spin_irqflags_t flags;
197 can_spin_lock_irqsave(&nsican_port_lock,flags);
198 outb(address-nsican_base, nsican_base);
199 ret=inb(nsican_base+1);
200 can_spin_unlock_irqrestore(&nsican_port_lock,flags);
205 /* !!! Don't change this function !!! */
206 int nsi_register(struct hwspecops_t *hwspecops)
208 hwspecops->request_io = nsi_request_io;
209 hwspecops->release_io = nsi_release_io;
210 hwspecops->reset = nsi_reset;
211 hwspecops->init_hw_data = nsi_init_hw_data;
212 hwspecops->init_chip_data = nsi_init_chip_data;
213 hwspecops->init_obj_data = nsi_init_obj_data;
214 hwspecops->write_register = nsi_write_register;
215 hwspecops->read_register = nsi_read_register;
216 hwspecops->program_irq = nsi_program_irq;