1 /**************************************************************************/
2 /* File: gensja1000io.c - sja1000 I/O mapped cards (PCAN-PC/104 etc) */
4 /* LinCAN - (Not only) Linux CAN bus driver */
5 /* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz> */
6 /* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz> */
7 /* Funded by OCERA and FRESCOR IST projects */
8 /* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl> */
10 /* LinCAN is free software; you can redistribute it and/or modify it */
11 /* under terms of the GNU General Public License as published by the */
12 /* Free Software Foundation; either version 2, or (at your option) any */
13 /* later version. LinCAN is distributed in the hope that it will be */
14 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty */
15 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
16 /* General Public License for more details. You should have received a */
17 /* copy of the GNU General Public License along with LinCAN; see file */
18 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
19 /* Cambridge, MA 02139, USA. */
21 /* To allow use of LinCAN in the compact embedded systems firmware */
22 /* and RT-executives (RTEMS for example), main authors agree with next */
23 /* special exception: */
25 /* Including LinCAN header files in a file, instantiating LinCAN generics */
26 /* or templates, or linking other files with LinCAN objects to produce */
27 /* an application image/executable, does not by itself cause the */
28 /* resulting application image/executable to be covered by */
29 /* the GNU General Public License. */
30 /* This exception does not however invalidate any other reasons */
31 /* why the executable file might be covered by the GNU Public License. */
32 /* Publication of enhanced or derived LinCAN files is required although. */
33 /**************************************************************************/
35 #include "../include/can.h"
36 #include "../include/can_sysdep.h"
37 #include "../include/main.h"
38 #include "../include/gensja1000io.h"
39 #include "../include/sja1000p.h"
42 * IO_RANGE is the io-memory range that gets reserved, please adjust according
43 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
44 * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
49 * gensja1000io_request_io: - reserve io or memory range for can board
50 * @candev: pointer to candevice/board which asks for io. Field @io_addr
51 * of @candev is used in most cases to define start of the range
53 * The function gensja1000io_request_io() is used to reserve the io-memory. If your
54 * hardware uses a dedicated memory range as hardware control registers you
55 * will have to add the code to reserve this memory as well.
56 * %IO_RANGE is the io-memory range that gets reserved, please adjust according
57 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
58 * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
59 * Return Value: The function returns zero on success or %-ENODEV on failure
60 * File: src/gensja1000io.c
62 int gensja1000io_request_io(struct candevice_t *candev)
64 if (!can_request_io_region(candev->io_addr,IO_RANGE,DEVICE_NAME)) {
65 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
68 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr, candev->io_addr + IO_RANGE - 1);
74 * gensja1000io_elease_io - free reserved io memory range
75 * @candev: pointer to candevice/board which releases io
77 * The function gensja1000io_release_io() is used to free reserved io-memory.
78 * In case you have reserved more io memory, don't forget to free it here.
79 * IO_RANGE is the io-memory range that gets released, please adjust according
80 * your hardware. Example: #define IO_RANGE 0x100 for i82527 chips or
81 * #define IO_RANGE 0x20 for sja1000 chips in basic CAN mode.
82 * Return Value: The function always returns zero
83 * File: src/gensja1000io.c
85 int gensja1000io_release_io(struct candevice_t *candev)
87 can_release_io_region(candev->io_addr,IO_RANGE);
93 * gensja1000io_reset - hardware reset routine
94 * @candev: Pointer to candevice/board structure
96 * The function gensja1000io_reset() is used to give a hardware reset. This is
97 * rather hardware specific so I haven't included example code. Don't forget to
98 * check the reset status of the chip before returning.
99 * Return Value: The function returns zero on success or %-ENODEV on failure
100 * File: src/gensja1000io.c
102 int gensja1000io_reset(struct candevice_t *candev)
105 struct canchip_t *chip=candev->chip[0];
108 gensja1000io_write_register(sjaMOD_RM, chip->chip_base_addr+SJAMOD);
111 cdr=gensja1000io_read_register(chip->chip_base_addr+SJACDR);
112 gensja1000io_write_register(cdr|sjaCDR_PELICAN, chip->chip_base_addr+SJACDR);
114 gensja1000io_write_register(0, chip->chip_base_addr+SJAIER);
117 gensja1000io_write_register(0, chip->chip_base_addr+SJAMOD);
118 while (gensja1000io_read_register(chip->chip_base_addr+SJAMOD)&sjaMOD_RM){
119 if(!i--) return -ENODEV;
121 gensja1000io_write_register(0, chip->chip_base_addr+SJAMOD);
124 cdr=gensja1000io_read_register(chip->chip_base_addr+SJACDR);
125 gensja1000io_write_register(cdr|sjaCDR_PELICAN, chip->chip_base_addr+SJACDR);
127 gensja1000io_write_register(0, chip->chip_base_addr+SJAIER);
132 #define RESET_ADDR 0x0
137 * gensja1000io_init_hw_data - Initialize hardware cards
138 * @candev: Pointer to candevice/board structure
140 * The function gensja1000io_init_hw_data() is used to initialize the hardware
141 * structure containing information about the installed CAN-board.
142 * %RESET_ADDR represents the io-address of the hardware reset register.
143 * %NR_82527 represents the number of intel 82527 chips on the board.
144 * %NR_SJA1000 represents the number of philips sja1000 chips on the board.
145 * The flags entry can currently only be %CANDEV_PROGRAMMABLE_IRQ to indicate that
146 * the hardware uses programmable interrupts.
147 * Return Value: The function always returns zero
148 * File: src/gensja1000io.c
150 int gensja1000io_init_hw_data(struct candevice_t *candev)
152 candev->res_addr=RESET_ADDR;
153 candev->nr_82527_chips=0;
154 candev->nr_sja1000_chips=1;
155 candev->nr_all_chips=1;
156 candev->flags |= CANDEV_PROGRAMMABLE_IRQ*0;
162 * gensja1000io_init_chip_data - Initialize chips
163 * @candev: Pointer to candevice/board structure
164 * @chipnr: Number of the CAN chip on the hardware card
166 * The function gensja1000io_init_chip_data() is used to initialize the hardware
167 * structure containing information about the CAN chips.
168 * %CHIP_TYPE represents the type of CAN chip. %CHIP_TYPE can be "i82527" or
170 * The @chip_base_addr entry represents the start of the 'official' memory map
171 * of the installed chip. It's likely that this is the same as the @io_addr
172 * argument supplied at module loading time.
173 * The @clock entry holds the chip clock value in Hz.
174 * The entry @sja_cdr_reg holds hardware specific options for the Clock Divider
175 * register. Options defined in the %sja1000.h file:
176 * %sjaCDR_CLKOUT_MASK, %sjaCDR_CLK_OFF, %sjaCDR_RXINPEN, %sjaCDR_CBP, %sjaCDR_PELICAN
177 * The entry @sja_ocr_reg holds hardware specific options for the Output Control
178 * register. Options defined in the %sja1000.h file:
179 * %sjaOCR_MODE_BIPHASE, %sjaOCR_MODE_TEST, %sjaOCR_MODE_NORMAL, %sjaOCR_MODE_CLOCK,
180 * %sjaOCR_TX0_LH, %sjaOCR_TX1_ZZ.
181 * The entry @int_clk_reg holds hardware specific options for the Clock Out
182 * register. Options defined in the %i82527.h file:
183 * %iCLK_CD0, %iCLK_CD1, %iCLK_CD2, %iCLK_CD3, %iCLK_SL0, %iCLK_SL1.
184 * The entry @int_bus_reg holds hardware specific options for the Bus
185 * Configuration register. Options defined in the %i82527.h file:
186 * %iBUS_DR0, %iBUS_DR1, %iBUS_DT1, %iBUS_POL, %iBUS_CBY.
187 * The entry @int_cpu_reg holds hardware specific options for the cpu interface
188 * register. Options defined in the %i82527.h file:
189 * %iCPU_CEN, %iCPU_MUX, %iCPU_SLP, %iCPU_PWD, %iCPU_DMC, %iCPU_DSC, %iCPU_RST.
190 * Return Value: The function always returns zero
191 * File: src/gensja1000io.c
193 int gensja1000io_init_chip_data(struct candevice_t *candev, int chipnr)
195 /*sja1000_fill_chipspecops(candev->chip[chipnr]);*/
196 sja1000p_fill_chipspecops(candev->chip[chipnr]);
198 candev->chip[chipnr]->chip_base_addr=can_ioport2ioptr(candev->io_addr);
199 if(candev->chip[chipnr]->clock<=0)
200 candev->chip[chipnr]->clock = 16000000;
201 candev->chip[chipnr]->int_clk_reg = 0x0;
202 candev->chip[chipnr]->int_bus_reg = 0x0;
203 candev->chip[chipnr]->sja_cdr_reg = sjaCDR_CBP | sjaCDR_CLK_OFF;
204 candev->chip[chipnr]->sja_ocr_reg = sjaOCR_MODE_NORMAL | sjaOCR_TX0_LH;
210 * gensja1000io_init_obj_data - Initialize message buffers
211 * @chip: Pointer to chip specific structure
212 * @objnr: Number of the message buffer
214 * The function gensja1000io_init_obj_data() is used to initialize the hardware
215 * structure containing information about the different message objects on the
216 * CAN chip. In case of the sja1000 there's only one message object but on the
217 * i82527 chip there are 15.
218 * The code below is for a i82527 chip and initializes the object base addresses
219 * The entry @obj_base_addr represents the first memory address of the message
220 * object. In case of the sja1000 @obj_base_addr is taken the same as the chips
222 * Unless the hardware uses a segmented memory map, flags can be set zero.
223 * Return Value: The function always returns zero
224 * File: src/gensja1000io.c
226 int gensja1000io_init_obj_data(struct canchip_t *chip, int objnr)
228 chip->msgobj[objnr]->obj_base_addr=chip->chip_base_addr;
233 * gensja1000io_program_irq - program interrupts
234 * @candev: Pointer to candevice/board structure
236 * The function gensja1000io_program_irq() is used for hardware that uses
237 * programmable interrupts. If your hardware doesn't use programmable interrupts
238 * you should not set the @candevices_t->flags entry to %CANDEV_PROGRAMMABLE_IRQ and
239 * leave this function unedited. Again this function is hardware specific so
240 * there's no example code.
241 * Return value: The function returns zero on success or %-ENODEV on failure
242 * File: src/gensja1000io.c
244 int gensja1000io_program_irq(struct candevice_t *candev)
250 * gensja1000io_write_register - Low level write register routine
251 * @data: data to be written
252 * @address: memory address to write to
254 * The function gensja1000io_write_register() is used to write to hardware registers
255 * on the CAN chip. You should only have to edit this function if your hardware
256 * uses some specific write process.
257 * Return Value: The function does not return a value
258 * File: src/gensja1000io.c
260 void gensja1000io_write_register(unsigned data, can_ioptr_t address)
262 /*DEBUGMSG("gensja1000io_write_register: addr=0x%lx data=0x%x",
264 can_outb(data,address);
268 * gensja1000io_read_register - Low level read register routine
269 * @address: memory address to read from
271 * The function gensja1000io_read_register() is used to read from hardware registers
272 * on the CAN chip. You should only have to edit this function if your hardware
273 * uses some specific read process.
274 * Return Value: The function returns the value stored in @address
275 * File: src/gensja1000io.c
277 unsigned gensja1000io_read_register(can_ioptr_t address)
279 return can_inb(address);
282 /* !!! Don't change this function !!! */
283 int gensja1000io_register(struct hwspecops_t *hwspecops)
285 hwspecops->request_io = gensja1000io_request_io;
286 hwspecops->release_io = gensja1000io_release_io;
287 hwspecops->reset = gensja1000io_reset;
288 hwspecops->init_hw_data = gensja1000io_init_hw_data;
289 hwspecops->init_chip_data = gensja1000io_init_chip_data;
290 hwspecops->init_obj_data = gensja1000io_init_obj_data;
291 hwspecops->write_register = gensja1000io_write_register;
292 hwspecops->read_register = gensja1000io_read_register;
293 hwspecops->program_irq = gensja1000io_program_irq;