drivers/net/wireless/ti/wl18xx/io.c

   1 /*
   2  * This file is part of wl18xx
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include "../wlcore/wlcore.h"
  23 #include "../wlcore/io.h"
  24
  25 #include "io.h"
  26
  27 int wl18xx_top_reg_write(struct wl1271 *wl, int addr, u16 val)
  28 {
  29         u32 tmp;
  30         int ret;
  31
  32         if (WARN_ON(addr % 2))
  33                 return -EINVAL;
  34
  35         if ((addr % 4) == 0) {
  36                 ret = wlcore_read32(wl, addr, &tmp);
  37                 if (ret < 0)
  38                         goto out;
  39
  40                 tmp = (tmp & 0xffff0000) | val;
  41                 ret = wlcore_write32(wl, addr, tmp);
  42         } else {
  43                 ret = wlcore_read32(wl, addr - 2, &tmp);
  44                 if (ret < 0)
  45                         goto out;
  46
  47                 tmp = (tmp & 0xffff) | (val << 16);
  48                 ret = wlcore_write32(wl, addr - 2, tmp);
  49         }
  50
  51 out:
  52         return ret;
  53 }
  54
  55 int wl18xx_top_reg_read(struct wl1271 *wl, int addr, u16 *out)
  56 {
  57         u32 val = 0;
  58         int ret;
  59
  60         if (WARN_ON(addr % 2))
  61                 return -EINVAL;
  62
  63         if ((addr % 4) == 0) {
  64                 /* address is 4-bytes aligned */
  65                 ret = wlcore_read32(wl, addr, &val);
  66                 if (ret >= 0 && out)
  67                         *out = val & 0xffff;
  68         } else {
  69                 ret = wlcore_read32(wl, addr - 2, &val);
  70                 if (ret >= 0 && out)
  71                         *out = (val & 0xffff0000) >> 16;
  72         }
  73
  74         return ret;
  75 }