LXR uboot/arch/arm/cpu/arm926ejs/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 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <asm/errno.h>
  12#include <asm/io.h>
  13#include <asm/arch/clock.h>
  14#include <asm/arch/iomux.h>
  15#include <asm/arch/imx-regs.h>
  16
  17#if     defined(CONFIG_MX23)
  18#define DRIVE_OFFSET    0x200
  19#define PULL_OFFSET     0x400
  20#elif   defined(CONFIG_MX28)
  21#define DRIVE_OFFSET    0x300
  22#define PULL_OFFSET     0x600
  23#else
  24#error "Please select CONFIG_MX23 or CONFIG_MX28"
  25#endif
  26
  27/*
  28 * configures a single pad in the iomuxer
  29 */
  30int mxs_iomux_setup_pad(iomux_cfg_t pad)
  31{
  32        u32 reg, ofs, bp, bm;
  33        void *iomux_base = (void *)MXS_PINCTRL_BASE;
  34        struct mxs_register_32 *mxs_reg;
  35
  36        /* muxsel */
  37        ofs = 0x100;
  38        ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
  39        bp = PAD_PIN(pad) % 16 * 2;
  40        bm = 0x3 << bp;
  41        reg = readl(iomux_base + ofs);
  42        reg &= ~bm;
  43        reg |= PAD_MUXSEL(pad) << bp;
  44        writel(reg, iomux_base + ofs);
  45
  46        /* drive */
  47        ofs = DRIVE_OFFSET;
  48        ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
  49        /* mA */
  50        if (PAD_MA_VALID(pad)) {
  51                bp = PAD_PIN(pad) % 8 * 4;
  52                bm = 0x3 << bp;
  53                reg = readl(iomux_base + ofs);
  54                reg &= ~bm;
  55                reg |= PAD_MA(pad) << bp;
  56                writel(reg, iomux_base + ofs);
  57        }
  58        /* vol */
  59        if (PAD_VOL_VALID(pad)) {
  60                bp = PAD_PIN(pad) % 8 * 4 + 2;
  61                mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
  62                if (PAD_VOL(pad))
  63                        writel(1 << bp, &mxs_reg->reg_set);
  64                else
  65                        writel(1 << bp, &mxs_reg->reg_clr);
  66        }
  67
  68        /* pull */
  69        if (PAD_PULL_VALID(pad)) {
  70                ofs = PULL_OFFSET;
  71                ofs += PAD_BANK(pad) * 0x10;
  72                bp = PAD_PIN(pad);
  73                mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
  74                if (PAD_PULL(pad))
  75                        writel(1 << bp, &mxs_reg->reg_set);
  76                else
  77                        writel(1 << bp, &mxs_reg->reg_clr);
  78        }
  79
  80        return 0;
  81}
  82
  83int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
  84{
  85        const iomux_cfg_t *p = pad_list;
  86        int i;
  87        int ret;
  88
  89        for (i = 0; i < count; i++) {
  90                ret = mxs_iomux_setup_pad(*p);
  91                if (ret)
  92                        return ret;
  93                p++;
  94        }
  95
  96        return 0;
  97}
  98