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 "../include/can.h"
9 #include "../include/can_sysdep.h"
10 #include "../include/main.h"
11 #include "../include/ssv.h"
12 #include "../include/i82527.h"
14 int ssvcan_irq[2]={-1,-1};
15 unsigned long ssvcan_base=0x0;
17 /* IO_RANGE is the io-memory range that gets reserved, please adjust according
18 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
19 * #define IO_RANGE 0x20 for sja1000 chips.
23 /* The function template_request_io is used to reserve the io-memory. If your
24 * hardware uses a dedicated memory range as hardware control registers you
25 * will have to add the code to reserve this memory as well.
26 * The reserved memory starts at io_addr, wich is the module parameter io.
28 int ssv_request_io(struct candevice_t *candev)
31 if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) {
32 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
35 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr,
36 candev->io_addr + IO_RANGE - 1);
41 /* The function template_release_io is used to free the previously reserved
42 * io-memory. In case you reserved more memory, don't forget to free it here.
44 int ssv_release_io(struct candevice_t *candev)
47 can_release_io_region(candev->io_addr,IO_RANGE);
52 /* The function template_reset is used to give a hardware reset. This is rather
53 * hardware specific so I haven't included example code. Don't forget to check
54 * the reset status of the chip before returning.
56 int ssv_reset(struct candevice_t *candev)
60 DEBUGMSG("Resetting ssv hardware ...\n");
61 ssv_write_register(1,ssvcan_base+iCPU);
62 ssv_write_register(0,ssvcan_base+iCPU);
63 ssv_write_register(1,ssvcan_base+0x100+iCPU);
64 ssv_write_register(0,ssvcan_base+0x100+iCPU);
66 for (i = 1; i < 1000; i++)
69 /* Check hardware reset status */
71 while ( (ssv_read_register(ssvcan_base+iCPU) & iCPU_RST) && (i<=15)) {
76 CANMSG("Reset status timeout!\n");
77 CANMSG("Please check your hardware.\n");
81 DEBUGMSG("Chip0 reset status ok.\n");
83 /* Check hardware reset status */
85 while ( (ssv_read_register(ssvcan_base+0x100+iCPU) & iCPU_RST) && (i<=15)) {
90 CANMSG("Reset status timeout!\n");
91 CANMSG("Please check your hardware.\n");
95 DEBUGMSG("Chip1 reset status ok.\n");
102 /* The function template_init_hw_data is used to initialize the hardware
103 * structure containing information about the installed CAN-board.
104 * RESET_ADDR represents the io-address of the hardware reset register.
105 * NR_82527 represents the number of intel 82527 chips on the board.
106 * NR_SJA1000 represents the number of philips sja1000 chips on the board.
107 * The flags entry can currently only be CANDEV_PROGRAMMABLE_IRQ to indicate that
108 * the hardware uses programmable interrupts.
110 #define RESET_ADDR 0x02
114 int ssv_init_hw_data(struct candevice_t *candev)
116 candev->res_addr=RESET_ADDR;
117 candev->nr_82527_chips=NR_82527;
118 candev->nr_sja1000_chips=0;
119 candev->nr_all_chips=NR_82527;
120 candev->flags |= CANDEV_PROGRAMMABLE_IRQ;
125 /* The function template_init_chip_data is used to initialize the hardware
126 * structure containing information about the CAN chips.
127 * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or
129 * The chip_base_addr entry represents the start of the 'official' memory map
130 * of the installed chip. It's likely that this is the same as the io_addr
131 * argument supplied at module loading time.
132 * The clock argument holds the chip clock value in Hz.
134 #define CHIP_TYPE "i82527"
136 int ssv_init_chip_data(struct candevice_t *candev, int chipnr)
138 candev->chip[chipnr]->chip_type=CHIP_TYPE;
139 candev->chip[chipnr]->chip_base_addr=
140 candev->io_addr+0x100*chipnr;
141 candev->chip[chipnr]->clock = 16000000;
142 ssvcan_irq[chipnr]=candev->chip[chipnr]->chip_irq;
144 ssvcan_base=candev->io_addr;
146 candev->chip[chipnr]->int_cpu_reg = iCPU_DSC;
147 candev->chip[chipnr]->int_clk_reg = iCLK_SL1;
148 candev->chip[chipnr]->int_bus_reg = iBUS_CBY;
152 /* The function template_init_obj_data is used to initialize the hardware
153 * structure containing information about the different message objects on the
154 * CAN chip. In case of the sja1000 there's only one message object but on the
155 * i82527 chip there are 15.
156 * The code below is for a i82527 chip and initializes the object base addresses
157 * The entry obj_base_addr represents the first memory address of the message
158 * object. In case of the sja1000 obj_base_addr is taken the same as the chips
160 * Unless the hardware uses a segmented memory map, flags can be set zero.
162 int ssv_init_obj_data(struct chip_t *chip, int objnr)
165 chip->msgobj[objnr]->obj_base_addr=
166 chip->chip_base_addr+(objnr+1)*0x10;
171 /* The function template_program_irq is used for hardware that uses programmable
172 * interrupts. If your hardware doesn't use programmable interrupts you should
173 * not set the candevices_t->flags entry to CANDEV_PROGRAMMABLE_IRQ and leave this
174 * function unedited. Again this function is hardware specific so there's no
177 int ssv_program_irq(struct candevice_t *candev)
182 /* The function template_write_register is used to write to hardware registers
183 * on the CAN chip. You should only have to edit this function if your hardware
184 * uses some specific write process.
186 void ssv_write_register(unsigned char data, unsigned long address)
188 /* address is an absolute address */
190 /* the ssv card has two registers, the address register at 0x0
191 and the data register at 0x01 */
193 /* write the relative address on the eight LSB bits
194 and the data on the eight MSB bits in one time */
195 if((address-ssvcan_base)<0x100)
196 outw(address-ssvcan_base + (256 * data), ssvcan_base);
198 outw(address-ssvcan_base-0x100 + (256 * data), ssvcan_base+0x02);
201 /* The function template_read_register is used to read from hardware registers
202 * on the CAN chip. You should only have to edit this function if your hardware
203 * uses some specific read process.
205 unsigned ssv_read_register(unsigned long address)
207 /* this is the same thing that the function write_register.
208 We use the two register, we write the address where we
209 want to read in a first time. In a second time we read the
214 if((address-ssvcan_base)<0x100)
216 can_disable_irq(ssvcan_irq[0]);
217 outb(address-ssvcan_base, ssvcan_base);
218 ret=inb(ssvcan_base+1);
219 can_enable_irq(ssvcan_irq[0]);
223 can_disable_irq(ssvcan_irq[1]);
224 outb(address-ssvcan_base-0x100, ssvcan_base+0x02);
225 ret=inb(ssvcan_base+1+0x02);
226 can_enable_irq(ssvcan_irq[1]);
233 /* !!! Don't change this function !!! */
234 int ssv_register(struct hwspecops_t *hwspecops)
236 hwspecops->request_io = ssv_request_io;
237 hwspecops->release_io = ssv_release_io;
238 hwspecops->reset = ssv_reset;
239 hwspecops->init_hw_data = ssv_init_hw_data;
240 hwspecops->init_chip_data = ssv_init_chip_data;
241 hwspecops->init_obj_data = ssv_init_obj_data;
242 hwspecops->write_register = ssv_write_register;
243 hwspecops->read_register = ssv_read_register;
244 hwspecops->program_irq = ssv_program_irq;