102 строки
2.6 KiB
C
102 строки
2.6 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 <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/gpio.h>
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#include <asm/mach/map.h>
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#include <mach/mxs.h>
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#include <mach/iomux.h>
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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 __iomem *iomux_base = MXS_IO_ADDRESS(MXS_PINCTRL_BASE_ADDR);
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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 = __raw_readl(iomux_base + ofs);
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reg &= ~bm;
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reg |= PAD_MUXSEL(pad) << bp;
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__raw_writel(reg, iomux_base + ofs);
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/* drive */
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ofs = cpu_is_mx23() ? 0x200 : 0x300;
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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 = __raw_readl(iomux_base + ofs);
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reg &= ~bm;
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reg |= PAD_MA(pad) << bp;
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__raw_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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if (PAD_VOL(pad))
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__mxs_setl(1 << bp, iomux_base + ofs);
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else
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__mxs_clrl(1 << bp, iomux_base + ofs);
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}
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/* pull */
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if (PAD_PULL_VALID(pad)) {
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ofs = cpu_is_mx23() ? 0x400 : 0x600;
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ofs += PAD_BANK(pad) * 0x10;
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bp = PAD_PIN(pad);
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if (PAD_PULL(pad))
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__mxs_setl(1 << bp, iomux_base + ofs);
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else
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__mxs_clrl(1 << bp, iomux_base + ofs);
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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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