arch/powerpc/cpu/mpc83xx/qe_io.c

   1 /*
   2  * Copyright (C) 2006 Freescale Semiconductor, Inc.
   3  *
   4  * Dave Liu <daveliu@freescale.com>
   5  * based on source code of Shlomi Gridish
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include "common.h"
  24 #include "asm/errno.h"
  25 #include "asm/io.h"
  26 #include "asm/immap_83xx.h"
  27
  28 #define NUM_OF_PINS     32
  29 void qe_config_iopin(u8 port, u8 pin, int dir, int open_drain, int assign)
  30 {
  31         u32                     pin_2bit_mask;
  32         u32                     pin_2bit_dir;
  33         u32                     pin_2bit_assign;
  34         u32                     pin_1bit_mask;
  35         u32                     tmp_val;
  36         volatile immap_t        *im = (volatile immap_t *)CONFIG_SYS_IMMR;
  37         volatile qepio83xx_t    *par_io = (volatile qepio83xx_t *)&im->qepio;
  38
  39         /* Caculate pin location and 2bit mask and dir */
  40         pin_2bit_mask = (u32)(0x3 << (NUM_OF_PINS-(pin%(NUM_OF_PINS/2)+1)*2));
  41         pin_2bit_dir = (u32)(dir << (NUM_OF_PINS-(pin%(NUM_OF_PINS/2)+1)*2));
  42
  43         /* Setup the direction */
  44         tmp_val = (pin > (NUM_OF_PINS/2) - 1) ? \
  45                 in_be32(&par_io->ioport[port].dir2) :
  46                 in_be32(&par_io->ioport[port].dir1);
  47
  48         if (pin > (NUM_OF_PINS/2) -1) {
  49                 out_be32(&par_io->ioport[port].dir2, ~pin_2bit_mask & tmp_val);
  50                 out_be32(&par_io->ioport[port].dir2, pin_2bit_dir | tmp_val);
  51         } else {
  52                 out_be32(&par_io->ioport[port].dir1, ~pin_2bit_mask & tmp_val);
  53                 out_be32(&par_io->ioport[port].dir1, pin_2bit_dir | tmp_val);
  54         }
  55
  56         /* Calculate pin location for 1bit mask */
  57         pin_1bit_mask = (u32)(1 << (NUM_OF_PINS - (pin+1)));
  58
  59         /* Setup the open drain */
  60         tmp_val = in_be32(&par_io->ioport[port].podr);
  61         if (open_drain) {
  62                 out_be32(&par_io->ioport[port].podr, pin_1bit_mask | tmp_val);
  63         } else {
  64                 out_be32(&par_io->ioport[port].podr, ~pin_1bit_mask & tmp_val);
  65         }
  66
  67         /* Setup the assignment */
  68         tmp_val = (pin > (NUM_OF_PINS/2) - 1) ?
  69                 in_be32(&par_io->ioport[port].ppar2):
  70                 in_be32(&par_io->ioport[port].ppar1);
  71         pin_2bit_assign = (u32)(assign
  72                                 << (NUM_OF_PINS - (pin%(NUM_OF_PINS/2)+1)*2));
  73
  74         /* Clear and set 2 bits mask */
  75         if (pin > (NUM_OF_PINS/2) - 1) {
  76                 out_be32(&par_io->ioport[port].ppar2, ~pin_2bit_mask & tmp_val);
  77                 out_be32(&par_io->ioport[port].ppar2, pin_2bit_assign | tmp_val);
  78         } else {
  79                 out_be32(&par_io->ioport[port].ppar1, ~pin_2bit_mask & tmp_val);
  80                 out_be32(&par_io->ioport[port].ppar1, pin_2bit_assign | tmp_val);
  81         }
  82 }