2 * Linux CAN-bus device driver.
3 * Written by Arnaud Westenberg email:arnaud@casema.net
4 * This software is released under the GPL-License.
5 * Version 0.6 18 Sept 2000
8 #include <linux/autoconf.h>
10 #include <linux/ioport.h>
11 #include <linux/delay.h>
12 #include <asm/errno.h>
16 #include "../include/main.h"
17 #include "../include/ssv.h"
18 #include "../include/i82527.h"
20 int ssvcan_irq[2]={-1,-1};
21 unsigned long ssvcan_base=0x0;
23 /* IO_RANGE is the io-memory range that gets reserved, please adjust according
24 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
25 * #define IO_RANGE 0x20 for sja1000 chips.
29 /* The function template_request_io is used to reserve the io-memory. If your
30 * hardware uses a dedicated memory range as hardware control registers you
31 * will have to add the code to reserve this memory as well.
32 * The reserved memory starts at io_addr, wich is the module parameter io.
34 int ssv_request_io(struct candevice_t *candev)
37 if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) {
38 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
41 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr,
42 candev->io_addr + IO_RANGE - 1);
47 /* The function template_release_io is used to free the previously reserved
48 * io-memory. In case you reserved more memory, don't forget to free it here.
50 int ssv_release_io(struct candevice_t *candev)
53 can_release_io_region(candev->io_addr,IO_RANGE);
58 /* The function template_reset is used to give a hardware reset. This is rather
59 * hardware specific so I haven't included example code. Don't forget to check
60 * the reset status of the chip before returning.
62 int ssv_reset(struct candevice_t *candev)
66 DEBUGMSG("Resetting ssv hardware ...\n");
67 ssv_write_register(1,ssvcan_base+iCPU);
68 ssv_write_register(0,ssvcan_base+iCPU);
69 ssv_write_register(1,ssvcan_base+0x100+iCPU);
70 ssv_write_register(0,ssvcan_base+0x100+iCPU);
72 for (i = 1; i < 1000; i++)
75 /* Check hardware reset status */
77 while ( (ssv_read_register(ssvcan_base+iCPU) & iCPU_RST) && (i<=15)) {
82 CANMSG("Reset status timeout!\n");
83 CANMSG("Please check your hardware.\n");
87 DEBUGMSG("Chip0 reset status ok.\n");
89 /* Check hardware reset status */
91 while ( (ssv_read_register(ssvcan_base+0x100+iCPU) & iCPU_RST) && (i<=15)) {
96 CANMSG("Reset status timeout!\n");
97 CANMSG("Please check your hardware.\n");
101 DEBUGMSG("Chip1 reset status ok.\n");
108 /* The function template_init_hw_data is used to initialize the hardware
109 * structure containing information about the installed CAN-board.
110 * RESET_ADDR represents the io-address of the hardware reset register.
111 * NR_82527 represents the number of intel 82527 chips on the board.
112 * NR_SJA1000 represents the number of philips sja1000 chips on the board.
113 * The flags entry can currently only be PROGRAMMABLE_IRQ to indicate that
114 * the hardware uses programmable interrupts.
116 #define RESET_ADDR 0x02
120 int ssv_init_hw_data(struct candevice_t *candev)
122 candev->res_addr=RESET_ADDR;
123 candev->nr_82527_chips=NR_82527;
124 candev->nr_sja1000_chips=0;
125 candev->nr_all_chips=NR_82527;
126 candev->flags |= PROGRAMMABLE_IRQ;
131 /* The function template_init_chip_data is used to initialize the hardware
132 * structure containing information about the CAN chips.
133 * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or
135 * The chip_base_addr entry represents the start of the 'official' memory map
136 * of the installed chip. It's likely that this is the same as the io_addr
137 * argument supplied at module loading time.
138 * The clock argument holds the chip clock value in Hz.
140 #define CHIP_TYPE "i82527"
142 int ssv_init_chip_data(struct candevice_t *candev, int chipnr)
144 candev->chip[chipnr]->chip_type=CHIP_TYPE;
145 candev->chip[chipnr]->chip_base_addr=
146 candev->io_addr+0x100*chipnr;
147 candev->chip[chipnr]->clock = 16000000;
148 ssvcan_irq[chipnr]=candev->chip[chipnr]->chip_irq;
150 ssvcan_base=candev->io_addr;
152 candev->chip[chipnr]->int_cpu_reg = iCPU_DSC;
153 candev->chip[chipnr]->int_clk_reg = iCLK_SL1;
154 candev->chip[chipnr]->int_bus_reg = iBUS_CBY;
158 /* The function template_init_obj_data is used to initialize the hardware
159 * structure containing information about the different message objects on the
160 * CAN chip. In case of the sja1000 there's only one message object but on the
161 * i82527 chip there are 15.
162 * The code below is for a i82527 chip and initializes the object base addresses
163 * The entry obj_base_addr represents the first memory address of the message
164 * object. In case of the sja1000 obj_base_addr is taken the same as the chips
166 * Unless the hardware uses a segmented memory map, flags can be set zero.
168 int ssv_init_obj_data(struct chip_t *chip, int objnr)
171 chip->msgobj[objnr]->obj_base_addr=
172 chip->chip_base_addr+(objnr+1)*0x10;
173 chip->msgobj[objnr]->flags=0;
178 /* The function template_program_irq is used for hardware that uses programmable
179 * interrupts. If your hardware doesn't use programmable interrupts you should
180 * not set the candevices_t->flags entry to PROGRAMMABLE_IRQ and leave this
181 * function unedited. Again this function is hardware specific so there's no
184 int ssv_program_irq(struct candevice_t *candev)
189 /* The function template_write_register is used to write to hardware registers
190 * on the CAN chip. You should only have to edit this function if your hardware
191 * uses some specific write process.
193 void ssv_write_register(unsigned char data, unsigned long address)
195 /* address is an absolute address */
197 /* the ssv card has two registers, the address register at 0x0
198 and the data register at 0x01 */
200 /* write the relative address on the eight LSB bits
201 and the data on the eight MSB bits in one time */
202 if((address-ssvcan_base)<0x100)
203 outw(address-ssvcan_base + (256 * data), ssvcan_base);
205 outw(address-ssvcan_base-0x100 + (256 * data), ssvcan_base+0x02);
208 /* The function template_read_register is used to read from hardware registers
209 * on the CAN chip. You should only have to edit this function if your hardware
210 * uses some specific read process.
212 unsigned ssv_read_register(unsigned long address)
214 /* this is the same thing that the function write_register.
215 We use the two register, we write the address where we
216 want to read in a first time. In a second time we read the
221 if((address-ssvcan_base)<0x100)
223 disable_irq(ssvcan_irq[0]);
224 outb(address-ssvcan_base, ssvcan_base);
225 ret=inb(ssvcan_base+1);
226 enable_irq(ssvcan_irq[0]);
230 disable_irq(ssvcan_irq[1]);
231 outb(address-ssvcan_base-0x100, ssvcan_base+0x02);
232 ret=inb(ssvcan_base+1+0x02);
233 enable_irq(ssvcan_irq[1]);
240 /* !!! Don't change this function !!! */
241 int ssv_register(struct hwspecops_t *hwspecops)
243 hwspecops->request_io = ssv_request_io;
244 hwspecops->release_io = ssv_release_io;
245 hwspecops->reset = ssv_reset;
246 hwspecops->init_hw_data = ssv_init_hw_data;
247 hwspecops->init_chip_data = ssv_init_chip_data;
248 hwspecops->init_obj_data = ssv_init_obj_data;
249 hwspecops->write_register = ssv_write_register;
250 hwspecops->read_register = ssv_read_register;
251 hwspecops->program_irq = ssv_program_irq;