arch/arm/mach-mxs/iomux.c

   1 /*
   2  * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
   3  * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
   4  * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
   5  *                       <armlinux@phytec.de>
   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
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  * MA 02110-1301, USA.
  20  */
  21
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/string.h>
  27 #include <linux/gpio.h>
  28
  29 #include <asm/mach/map.h>
  30
  31 #include <mach/mxs.h>
  32 #include <mach/iomux.h>
  33
  34 /*
  35  * configures a single pad in the iomuxer
  36  */
  37 int mxs_iomux_setup_pad(iomux_cfg_t pad)
  38 {
  39         u32 reg, ofs, bp, bm;
  40         void __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);
  41
  42         /* muxsel */
  43         ofs = 0x100;
  44         ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
  45         bp = PAD_PIN(pad) % 16 * 2;
  46         bm = 0x3 << bp;
  47         reg = __raw_readl(iomux_base + ofs);
  48         reg &= ~bm;
  49         reg |= PAD_MUXSEL(pad) << bp;
  50         __raw_writel(reg, iomux_base + ofs);
  51
  52         /* drive */
  53         ofs = cpu_is_mx23() ? 0x200 : 0x300;
  54         ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
  55         /* mA */
  56         if (PAD_MA_VALID(pad)) {
  57                 bp = PAD_PIN(pad) % 8 * 4;
  58                 bm = 0x3 << bp;
  59                 reg = __raw_readl(iomux_base + ofs);
  60                 reg &= ~bm;
  61                 reg |= PAD_MA(pad) << bp;
  62                 __raw_writel(reg, iomux_base + ofs);
  63         }
  64         /* vol */
  65         if (PAD_VOL_VALID(pad)) {
  66                 bp = PAD_PIN(pad) % 8 * 4 + 2;
  67                 if (PAD_VOL(pad))
  68                         __mxs_setl(1 << bp, iomux_base + ofs);
  69                 else
  70                         __mxs_clrl(1 << bp, iomux_base + ofs);
  71         }
  72
  73         /* pull */
  74         if (PAD_PULL_VALID(pad)) {
  75                 ofs = cpu_is_mx23() ? 0x400 : 0x600;
  76                 ofs += PAD_BANK(pad) * 0x10;
  77                 bp = PAD_PIN(pad);
  78                 if (PAD_PULL(pad))
  79                         __mxs_setl(1 << bp, iomux_base + ofs);
  80                 else
  81                         __mxs_clrl(1 << bp, iomux_base + ofs);
  82         }
  83
  84         return 0;
  85 }
  86
  87 int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
  88 {
  89         const iomux_cfg_t *p = pad_list;
  90         int i;
  91         int ret;
  92
  93         for (i = 0; i < count; i++) {
  94                 ret = mxs_iomux_setup_pad(*p);
  95                 if (ret)
  96                         return ret;
  97                 p++;
  98         }
  99
 100         return 0;
 101 }