6134b2cbb0
also, check for a valid pad_ctrl_ofs before changing the pad control register. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* Copyright 2004-2006 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 <mach/hardware.h>
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#include <asm/mach/map.h>
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#include <mach/iomux-v3.h>
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static void __iomem *base;
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static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG];
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/*
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* setups a single pin:
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* - reserves the pin so that it is not claimed by another driver
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* - setups the iomux according to the configuration
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*/
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int mxc_iomux_v3_setup_pad(struct pad_desc *pad)
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{
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unsigned int pad_ofs = pad->pad_ctrl_ofs;
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if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map))
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return -EBUSY;
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if (pad->mux_ctrl_ofs)
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__raw_writel(pad->mux_mode, base + pad->mux_ctrl_ofs);
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if (pad->select_input_ofs)
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__raw_writel(pad->select_input,
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base + pad->select_input_ofs);
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if (!(pad->pad_ctrl & NO_PAD_CTRL) && pad->pad_ctrl_ofs)
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__raw_writel(pad->pad_ctrl, base + pad->pad_ctrl_ofs);
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return 0;
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}
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EXPORT_SYMBOL(mxc_iomux_v3_setup_pad);
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int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count)
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{
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struct pad_desc *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 = mxc_iomux_v3_setup_pad(p);
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if (ret)
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goto setup_error;
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p++;
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}
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return 0;
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setup_error:
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mxc_iomux_v3_release_multiple_pads(pad_list, i);
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return ret;
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}
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EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads);
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void mxc_iomux_v3_release_pad(struct pad_desc *pad)
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{
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unsigned int pad_ofs = pad->pad_ctrl_ofs;
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clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map);
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}
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EXPORT_SYMBOL(mxc_iomux_v3_release_pad);
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void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count)
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{
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struct pad_desc *p = pad_list;
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int i;
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for (i = 0; i < count; i++) {
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mxc_iomux_v3_release_pad(p);
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p++;
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}
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}
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EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads);
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void mxc_iomux_v3_init(void __iomem *iomux_v3_base)
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{
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base = iomux_v3_base;
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}
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