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 lincan-0.3 17 Jun 2004
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 static can_spinlock_t ssv_port_lock=SPIN_LOCK_UNLOCKED;
19 /* IO_RANGE is the io-memory range that gets reserved, please adjust according
20 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
21 * #define IO_RANGE 0x20 for sja1000 chips.
25 /* The function template_request_io is used to reserve the io-memory. If your
26 * hardware uses a dedicated memory range as hardware control registers you
27 * will have to add the code to reserve this memory as well.
28 * The reserved memory starts at io_addr, wich is the module parameter io.
30 int ssv_request_io(struct candevice_t *candev)
33 if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) {
34 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
37 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr,
38 candev->io_addr + IO_RANGE - 1);
43 /* The function template_release_io is used to free the previously reserved
44 * io-memory. In case you reserved more memory, don't forget to free it here.
46 int ssv_release_io(struct candevice_t *candev)
49 can_release_io_region(candev->io_addr,IO_RANGE);
54 /* The function template_reset is used to give a hardware reset. This is rather
55 * hardware specific so I haven't included example code. Don't forget to check
56 * the reset status of the chip before returning.
58 int ssv_reset(struct candevice_t *candev)
62 DEBUGMSG("Resetting ssv hardware ...\n");
63 ssv_write_register(1,ssvcan_base+iCPU);
64 ssv_write_register(0,ssvcan_base+iCPU);
65 ssv_write_register(1,ssvcan_base+0x100+iCPU);
66 ssv_write_register(0,ssvcan_base+0x100+iCPU);
68 for (i = 1; i < 1000; i++)
71 /* Check hardware reset status */
73 while ( (ssv_read_register(ssvcan_base+iCPU) & iCPU_RST) && (i<=15)) {
78 CANMSG("Reset status timeout!\n");
79 CANMSG("Please check your hardware.\n");
83 DEBUGMSG("Chip0 reset status ok.\n");
85 /* Check hardware reset status */
87 while ( (ssv_read_register(ssvcan_base+0x100+iCPU) & iCPU_RST) && (i<=15)) {
92 CANMSG("Reset status timeout!\n");
93 CANMSG("Please check your hardware.\n");
97 DEBUGMSG("Chip1 reset status ok.\n");
104 /* The function template_init_hw_data is used to initialize the hardware
105 * structure containing information about the installed CAN-board.
106 * RESET_ADDR represents the io-address of the hardware reset register.
107 * NR_82527 represents the number of intel 82527 chips on the board.
108 * NR_SJA1000 represents the number of philips sja1000 chips on the board.
109 * The flags entry can currently only be CANDEV_PROGRAMMABLE_IRQ to indicate that
110 * the hardware uses programmable interrupts.
112 #define RESET_ADDR 0x02
116 int ssv_init_hw_data(struct candevice_t *candev)
118 candev->res_addr=RESET_ADDR;
119 candev->nr_82527_chips=NR_82527;
120 candev->nr_sja1000_chips=0;
121 candev->nr_all_chips=NR_82527;
122 candev->flags |= CANDEV_PROGRAMMABLE_IRQ;
127 /* The function template_init_chip_data is used to initialize the hardware
128 * structure containing information about the CAN chips.
129 * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or
131 * The chip_base_addr entry represents the start of the 'official' memory map
132 * of the installed chip. It's likely that this is the same as the io_addr
133 * argument supplied at module loading time.
134 * The clock argument holds the chip clock value in Hz.
136 int ssv_init_chip_data(struct candevice_t *candev, int chipnr)
138 i82527_fill_chipspecops(candev->chip[chipnr]);
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 canchip_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 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
212 can_spin_irqflags_t flags;
215 if((address-ssvcan_base)<0x100)
217 can_spin_lock_irqsave(&ssv_port_lock,flags);
218 outb(address-ssvcan_base, ssvcan_base);
219 ret=inb(ssvcan_base+1);
220 can_spin_unlock_irqrestore(&ssv_port_lock,flags);
224 can_spin_lock_irqsave(&ssv_port_lock,flags);
225 outb(address-ssvcan_base-0x100, ssvcan_base+0x02);
226 ret=inb(ssvcan_base+1+0x02);
227 can_spin_unlock_irqrestore(&ssv_port_lock,flags);
234 /* !!! Don't change this function !!! */
235 int ssv_register(struct hwspecops_t *hwspecops)
237 hwspecops->request_io = ssv_request_io;
238 hwspecops->release_io = ssv_release_io;
239 hwspecops->reset = ssv_reset;
240 hwspecops->init_hw_data = ssv_init_hw_data;
241 hwspecops->init_chip_data = ssv_init_chip_data;
242 hwspecops->init_obj_data = ssv_init_obj_data;
243 hwspecops->write_register = ssv_write_register;
244 hwspecops->read_register = ssv_read_register;
245 hwspecops->program_irq = ssv_program_irq;