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/msmcan.h"
14 #include "../include/i82527.h"
16 static can_spinlock_t msmcan_port_lock=SPIN_LOCK_UNLOCKED;
18 /* IO_RANGE is the io-memory range that gets reserved, please adjust according
19 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
20 * #define IO_RANGE 0x20 for sja1000 chips.
24 /* The function template_request_io is used to reserve the io-memory. If your
25 * hardware uses a dedicated memory range as hardware control registers you
26 * will have to add the code to reserve this memory as well.
27 * The reserved memory starts at candev->io_addr, wich is the module parameter io.
29 int msmcan_request_io(struct candevice_t *candev)
32 if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) {
33 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
36 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr,
37 candev->io_addr + IO_RANGE - 1);
42 /* The function template_release_io is used to free the previously reserved
43 * io-memory. In case you reserved more memory, don't forget to free it here.
45 int msmcan_release_io(struct candevice_t *candev)
48 can_release_io_region(candev->io_addr,IO_RANGE);
53 /* The function template_reset is used to give a hardware reset. This is rather
54 * hardware specific so I haven't included example code. Don't forget to check
55 * the reset status of the chip before returning.
57 int msmcan_reset(struct candevice_t *candev)
59 struct canchip_t *chip=candev->chip[0];
61 DEBUGMSG("Resetting msmcan hardware ...\n");
62 /* we don't use template_write_register because we don't use the two first
63 registers of the card but the third in order to make a hard reset */
64 /* outb (1, msmcan_base + candev->res_addr); */
67 /* terrible MSMCAN reset design - best to comment out */
72 msmcan_write_register(iCTL_INI, chip->chip_base_addr+iCTL);
73 /*CLKOUT stopped (iCPU_CEN=0) */
74 msmcan_write_register(iCPU_DSC, chip->chip_base_addr+iCPU);
75 while(!(msmcan_read_register(chip->chip_base_addr+iCPU)&iCPU_CEN)){
78 CANMSG("Unable to reset board\n");
87 can_disable_irq(chip->chip_irq);
88 msmcan_write_register(iCTL_INI, chip->chip_base_addr+iCTL);
89 can_enable_irq(chip->chip_irq);
94 /* The function template_init_hw_data is used to initialize the hardware
95 * structure containing information about the installed CAN-board.
96 * RESET_ADDR represents the io-address of the hardware reset register.
97 * NR_82527 represents the number of intel 82527 chips on the board.
98 * NR_SJA1000 represents the number of philips sja1000 chips on the board.
99 * The flags entry can currently only be CANDEV_PROGRAMMABLE_IRQ to indicate that
100 * the hardware uses programmable interrupts.
105 int msmcan_init_hw_data(struct candevice_t *candev)
108 candev->nr_82527_chips=1;
109 candev->nr_sja1000_chips=0;
110 candev->nr_all_chips=1;
111 candev->flags |= CANDEV_PROGRAMMABLE_IRQ*0;
116 /* The function template_init_chip_data is used to initialize the hardware
117 * structure containing information about the CAN chips.
118 * CHIP_TYPE represents the type of CAN chip. CHIP_TYPE can be "i82527" or
120 * The chip_base_addr entry represents the start of the 'official' memory map
121 * of the installed chip. It's likely that this is the same as the candev->io_addr
122 * argument supplied at module loading time.
123 * The clock argument holds the chip clock value in Hz.
126 int msmcan_init_chip_data(struct candevice_t *candev, int chipnr)
128 i82527_fill_chipspecops(candev->chip[chipnr]);
129 /* device uses indexed access */
130 candev->chip[chipnr]->chip_base_addr=
131 candev->io_addr << 16;
132 candev->chip[chipnr]->clock = 16000000;
133 /* The CLKOUT has to be enabled to reset MSMCAN MAX1232 watchdog */
134 candev->chip[chipnr]->int_cpu_reg = iCPU_DSC | iCPU_CEN;
135 candev->chip[chipnr]->int_clk_reg = iCLK_SL1;
136 candev->chip[chipnr]->int_bus_reg = iBUS_CBY;
141 /* The function template_init_obj_data is used to initialize the hardware
142 * structure containing information about the different message objects on the
143 * CAN chip. In case of the sja1000 there's only one message object but on the
144 * i82527 chip there are 15.
145 * The code below is for a i82527 chip and initializes the object base addresses
146 * The entry obj_base_addr represents the first memory address of the message
147 * object. In case of the sja1000 obj_base_addr is taken the same as the chips
149 * Unless the hardware uses a segmented memory map, flags can be set zero.
151 int msmcan_init_obj_data(struct canchip_t *chip, int objnr)
154 chip->msgobj[objnr]->obj_base_addr=
155 chip->chip_base_addr+(objnr+1)*0x10;
160 /* The function template_program_irq is used for hardware that uses programmable
161 * interrupts. If your hardware doesn't use programmable interrupts you should
162 * not set the candevices_t->flags entry to CANDEV_PROGRAMMABLE_IRQ and leave this
163 * function unedited. Again this function is hardware specific so there's no
166 int msmcan_program_irq(struct candevice_t *candev)
171 /* The function template_write_register is used to write to hardware registers
172 * on the CAN chip. You should only have to edit this function if your hardware
173 * uses some specific write process.
175 void msmcan_write_register(unsigned data, unsigned long address)
177 /* address is combination of base address shifted left by 16 and index */
178 can_spin_irqflags_t flags;
180 /* the msmcan card has two registers, the data register at 0x0
181 and the address register at 0x01 */
183 can_spin_lock_irqsave(&msmcan_port_lock,flags);
184 outb(address & 0xff, (address>>16)+1);
185 outb(data, address>>16);
186 can_spin_unlock_irqrestore(&msmcan_port_lock,flags);
189 /* The function template_read_register is used to read from hardware registers
190 * on the CAN chip. You should only have to edit this function if your hardware
191 * uses some specific read process.
193 unsigned msmcan_read_register(unsigned long address)
195 /* this is the same thing that the function write_register.
196 We use the two register, we write the address where we
197 want to read in a first time. In a second time we read the
200 can_spin_irqflags_t flags;
203 can_spin_lock_irqsave(&msmcan_port_lock,flags);
204 outb(address & 0xff, (address>>16)+1);
205 ret=inb(address>>16);
206 can_spin_unlock_irqrestore(&msmcan_port_lock,flags);
211 /* !!! Don't change this function !!! */
212 int msmcan_register(struct hwspecops_t *hwspecops)
214 hwspecops->request_io = msmcan_request_io;
215 hwspecops->release_io = msmcan_release_io;
216 hwspecops->reset = msmcan_reset;
217 hwspecops->init_hw_data = msmcan_init_hw_data;
218 hwspecops->init_chip_data = msmcan_init_chip_data;
219 hwspecops->init_obj_data = msmcan_init_obj_data;
220 hwspecops->write_register = msmcan_write_register;
221 hwspecops->read_register = msmcan_read_register;
222 hwspecops->program_irq = msmcan_program_irq;