lincan/src/smartcan.c

   1 /**************************************************************************/
   2 /* File: smartcan.c - i82527 based card with indexed access               */
   3 /*                                                                        */
   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 /* Copyright (C) other parties found in actual files                      */
   8 /* Funded by OCERA and FRESCOR IST projects                               */
   9 /* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl>      */
  10 /*                                                                        */
  11 /* LinCAN is free software; you can redistribute it and/or modify it      */
  12 /* under terms of the GNU General Public License as published by the      */
  13 /* Free Software Foundation; either version 2, or (at your option) any    */
  14 /* later version.  LinCAN is distributed in the hope that it will be      */
  15 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
  16 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
  17 /* General Public License for more details. You should have received a    */
  18 /* copy of the GNU General Public License along with LinCAN; see file     */
  19 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
  20 /* Cambridge, MA 02139, USA.                                              */
  21 /*                                                                        */
  22 /* To allow use of LinCAN in the compact embedded systems firmware        */
  23 /* and RT-executives (RTEMS for example), main authors agree with next    */
  24 /* special exception:                                                     */
  25 /*                                                                        */
  26 /* Including LinCAN header files in a file, instantiating LinCAN generics */
  27 /* or templates, or linking other files with LinCAN objects to produce    */
  28 /* an application image/executable, does not by itself cause the          */
  29 /* resulting application image/executable to be covered by                */
  30 /* the GNU General Public License.                                        */
  31 /* This exception does not however invalidate any other reasons           */
  32 /* why the executable file might be covered by the GNU Public License.    */
  33 /* Publication of enhanced or derived LinCAN files is required although.  */
  34 /**************************************************************************/
  35
  36 #include "../include/can.h"
  37 #include "../include/can_sysdep.h"
  38 #include "../include/main.h"
  39 #include "../include/smartcan.h"
  40 #include "../include/i82527.h"
  41
  42 int smartcan_irq=-1;
  43 unsigned long smartcan_base=0x0;
  44
  45 static CAN_DEFINE_SPINLOCK(smartcan_port_lock);
  46
  47 int smartcan_request_io(struct candevice_t *candev)
  48 {
  49         if (!can_request_io_region(candev->io_addr,0x04,DEVICE_NAME)) {
  50                 CANMSG("Unable to open port: 0x%lx\n",candev->io_addr);
  51                 return -ENODEV;
  52         }else {
  53                 DEBUGMSG("Registered IO-memory: 0x%lx - 0x%lx\n", candev->io_addr, candev->io_addr + 0x04 - 1);
  54         }
  55         return 0;
  56 }
  57
  58 int smartcan_release_io(struct candevice_t *candev)
  59 {
  60         can_release_io_region(candev->io_addr,0x04);
  61
  62         return 0;
  63 }
  64
  65 int smartcan_reset(struct candevice_t *candev)
  66 {
  67         int i=0;
  68
  69         DEBUGMSG("Resetting smartcan hardware ...\n");
  70         can_outb(0x00,candev->res_addr);
  71         while (i < 1000000) {
  72                 i++;
  73                 can_outb(0x01,candev->res_addr);
  74         }
  75         can_outb(0x00,candev->res_addr);
  76
  77         /* Check hardware reset status */
  78         i=0;
  79         can_outb(candev->io_addr+iCPU,candev->io_addr);
  80         while ( (can_inb(candev->io_addr+1)&0x80) && (i<=15) ) {
  81                 mdelay(20);
  82                 i++;
  83         }
  84         if (i>=15) {
  85                 CANMSG("Reset status timeout!\n");
  86                 CANMSG("Please check your hardware.\n");
  87                 return -ENODEV;
  88         }
  89         else
  90                 DEBUGMSG("Chip0 reset status ok.\n");
  91
  92         return 0;
  93 }
  94
  95 int smartcan_init_hw_data(struct candevice_t *candev)
  96 {
  97         candev->res_addr=candev->io_addr+0x02;
  98         candev->nr_82527_chips=1;
  99         candev->nr_sja1000_chips=0;
 100         candev->nr_all_chips=1;
 101
 102         return 0;
 103 }
 104
 105 int smartcan_init_chip_data(struct candevice_t *candev, int chipnr)
 106 {
 107         i82527_fill_chipspecops(candev->chip[chipnr]);
 108         candev->chip[chipnr]->chip_base_addr=can_ioport2ioptr(candev->io_addr);
 109         candev->chip[chipnr]->clock = 16000000;
 110         candev->chip[chipnr]->int_cpu_reg = iCPU_DSC;
 111         candev->chip[chipnr]->int_clk_reg = iCLK_SL1;
 112         candev->chip[chipnr]->int_bus_reg = iBUS_CBY;
 113         candev->chip[chipnr]->sja_cdr_reg = 0;
 114         candev->chip[chipnr]->sja_ocr_reg = 0;
 115         smartcan_irq=candev->chip[chipnr]->chip_irq;
 116         smartcan_base=candev->chip[chipnr]->chip_base_addr;
 117
 118         return 0;
 119 }
 120
 121 int smartcan_init_obj_data(struct canchip_t *chip, int objnr)
 122 {
 123         chip->msgobj[objnr]->obj_base_addr=(objnr+1)*0x10;
 124
 125         return 0;
 126 }
 127
 128
 129 void smartcan_write_register(unsigned data, can_ioptr_t address)
 130 {
 131         can_spin_irqflags_t flags;
 132         can_spin_lock_irqsave(&smartcan_port_lock,flags);
 133         can_outb(address-smartcan_base,smartcan_base);
 134         can_outb(data,smartcan_base+1);
 135         can_spin_unlock_irqrestore(&smartcan_port_lock,flags);
 136 }
 137
 138 unsigned smartcan_read_register(can_ioptr_t address)
 139 {
 140         unsigned ret;
 141         can_spin_irqflags_t flags;
 142         can_spin_lock_irqsave(&smartcan_port_lock,flags);
 143         can_outb(address-smartcan_base,smartcan_base);
 144         ret=can_inb(smartcan_base+1);
 145         can_spin_unlock_irqrestore(&smartcan_port_lock,flags);
 146         return ret;
 147 }
 148
 149 int smartcan_program_irq(struct candevice_t *candev)
 150 {
 151         CANMSG("The 'smartcan' card doesn't have programmable interrupts\n");
 152         return 0;
 153 }
 154
 155 /* !!! Don't change this function !!! */
 156 int smartcan_register(struct hwspecops_t *hwspecops)
 157 {
 158         hwspecops->request_io = smartcan_request_io;
 159         hwspecops->release_io = smartcan_release_io;
 160         hwspecops->reset = smartcan_reset;
 161         hwspecops->init_hw_data = smartcan_init_hw_data;
 162         hwspecops->init_chip_data = smartcan_init_chip_data;
 163         hwspecops->init_obj_data = smartcan_init_obj_data;
 164         hwspecops->write_register = smartcan_write_register;
 165         hwspecops->read_register = smartcan_read_register;
 166         hwspecops->program_irq = smartcan_program_irq;
 167         return 0;
 168 }