LXR uboot/arch/arm/cpu/arm926ejs/mxs/iomux.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
   4 * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
   5 * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
   6 *                       <armlinux@phytec.de>
   7 */
   8
   9#include <common.h>
  10#include <linux/errno.h>
  11#include <asm/io.h>
  12#include <asm/arch/clock.h>
  13#include <asm/arch/iomux.h>
  14#include <asm/arch/imx-regs.h>
  15
  16#if     defined(CONFIG_MX23)
  17#define DRIVE_OFFSET    0x200
  18#define PULL_OFFSET     0x400
  19#elif   defined(CONFIG_MX28)
  20#define DRIVE_OFFSET    0x300
  21#define PULL_OFFSET     0x600
  22#else
  23#error "Please select CONFIG_MX23 or CONFIG_MX28"
  24#endif
  25
  26/*
  27 * configures a single pad in the iomuxer
  28 */
  29int mxs_iomux_setup_pad(iomux_cfg_t pad)
  30{
  31        u32 reg, ofs, bp, bm;
  32        void *iomux_base = (void *)MXS_PINCTRL_BASE;
  33        struct mxs_register_32 *mxs_reg;
  34
  35        /* muxsel */
  36        ofs = 0x100;
  37        ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
  38        bp = PAD_PIN(pad) % 16 * 2;
  39        bm = 0x3 << bp;
  40        reg = readl(iomux_base + ofs);
  41        reg &= ~bm;
  42        reg |= PAD_MUXSEL(pad) << bp;
  43        writel(reg, iomux_base + ofs);
  44
  45        /* drive */
  46        ofs = DRIVE_OFFSET;
  47        ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
  48        /* mA */
  49        if (PAD_MA_VALID(pad)) {
  50                bp = PAD_PIN(pad) % 8 * 4;
  51                bm = 0x3 << bp;
  52                reg = readl(iomux_base + ofs);
  53                reg &= ~bm;
  54                reg |= PAD_MA(pad) << bp;
  55                writel(reg, iomux_base + ofs);
  56        }
  57        /* vol */
  58        if (PAD_VOL_VALID(pad)) {
  59                bp = PAD_PIN(pad) % 8 * 4 + 2;
  60                mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
  61                if (PAD_VOL(pad))
  62                        writel(1 << bp, &mxs_reg->reg_set);
  63                else
  64                        writel(1 << bp, &mxs_reg->reg_clr);
  65        }
  66
  67        /* pull */
  68        if (PAD_PULL_VALID(pad)) {
  69                ofs = PULL_OFFSET;
  70                ofs += PAD_BANK(pad) * 0x10;
  71                bp = PAD_PIN(pad);
  72                mxs_reg = (struct mxs_register_32 *)(iomux_base + ofs);
  73                if (PAD_PULL(pad))
  74                        writel(1 << bp, &mxs_reg->reg_set);
  75                else
  76                        writel(1 << bp, &mxs_reg->reg_clr);
  77        }
  78
  79        return 0;
  80}
  81
  82int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
  83{
  84        const iomux_cfg_t *p = pad_list;
  85        int i;
  86        int ret;
  87
  88        for (i = 0; i < count; i++) {
  89                ret = mxs_iomux_setup_pad(*p);
  90                if (ret)
  91                        return ret;
  92                p++;
  93        }
  94
  95        return 0;
  96}
  97