mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 16:07:30 +00:00
d91a672b6d
Taken from Linux kernel with minor modifications:
commit bf985969e27b507f734435a99df8bf745a3dbb2b
Author: Shawn Guo <shawn.guo@freescale.com>
Date: Mon Dec 20 22:57:43 2010 +0800
ARM: mxs: Add iomux support
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/*
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* Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
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* Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH,
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* <armlinux@phytec.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <common.h>
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#include <asm/errno.h>
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#include <asm/io.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/iomux.h>
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#include <asm/arch/imx-regs.h>
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#if defined(CONFIG_MX23)
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#define DRIVE_OFFSET 0x200
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#define PULL_OFFSET 0x400
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#elif defined(CONFIG_MX28)
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#define DRIVE_OFFSET 0x300
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#define PULL_OFFSET 0x600
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#else
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#error "Please select CONFIG_MX23 or CONFIG_MX28"
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#endif
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/*
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* configures a single pad in the iomuxer
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*/
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int mxs_iomux_setup_pad(iomux_cfg_t pad)
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{
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u32 reg, ofs, bp, bm;
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void *iomux_base = (void *)MXS_PINCTRL_BASE;
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struct mx28_register *mxs_reg;
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/* muxsel */
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ofs = 0x100;
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ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10;
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bp = PAD_PIN(pad) % 16 * 2;
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bm = 0x3 << bp;
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reg = readl(iomux_base + ofs);
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reg &= ~bm;
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reg |= PAD_MUXSEL(pad) << bp;
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writel(reg, iomux_base + ofs);
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/* drive */
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ofs = DRIVE_OFFSET;
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ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10;
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/* mA */
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if (PAD_MA_VALID(pad)) {
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bp = PAD_PIN(pad) % 8 * 4;
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bm = 0x3 << bp;
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reg = readl(iomux_base + ofs);
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reg &= ~bm;
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reg |= PAD_MA(pad) << bp;
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writel(reg, iomux_base + ofs);
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}
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/* vol */
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if (PAD_VOL_VALID(pad)) {
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bp = PAD_PIN(pad) % 8 * 4 + 2;
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mxs_reg = (struct mx28_register *)(iomux_base + ofs);
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if (PAD_VOL(pad))
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writel(1 << bp, &mxs_reg->reg_set);
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else
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writel(1 << bp, &mxs_reg->reg_clr);
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}
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/* pull */
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if (PAD_PULL_VALID(pad)) {
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ofs = PULL_OFFSET;
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ofs += PAD_BANK(pad) * 0x10;
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bp = PAD_PIN(pad);
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mxs_reg = (struct mx28_register *)(iomux_base + ofs);
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if (PAD_PULL(pad))
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writel(1 << bp, &mxs_reg->reg_set);
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else
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writel(1 << bp, &mxs_reg->reg_clr);
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}
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return 0;
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}
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int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count)
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{
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const iomux_cfg_t *p = pad_list;
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int i;
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int ret;
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for (i = 0; i < count; i++) {
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ret = mxs_iomux_setup_pad(*p);
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if (ret)
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return ret;
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p++;
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}
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return 0;
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}
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