qe_io.c

来自「U-boot源码 ARM7启动代码」· C语言 代码 · 共 86 行

/*
 * Copyright (C) 2006 Freescale Semiconductor, Inc.
 *
 * Dave Liu <[e-mail]>
 * based on source code of Shlomi Gridish
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include "common.h"
#include "asm/errno.h"
#include "asm/io.h"
#include "asm/immap_85xx.h"

#if defined(CONFIG_QE)
#define	NUM_OF_PINS	32
void qe_config_iopin(u8 port, u8 pin, int dir, int open_drain, int assign)
{
	u32			pin_2bit_mask;
	u32			pin_2bit_dir;
	u32			pin_2bit_assign;
	u32			pin_1bit_mask;
	u32			tmp_val;
	volatile immap_t	*im = (volatile immap_t *)CFG_IMMR;
	volatile par_io_t	*par_io = (volatile par_io_t *)
						&(im->im_gur.qe_par_io);

	/* Caculate pin location and 2bit mask and dir */
	pin_2bit_mask = (u32)(0x3 << (NUM_OF_PINS-(pin%(NUM_OF_PINS/2)+1)*2));
	pin_2bit_dir = (u32)(dir << (NUM_OF_PINS-(pin%(NUM_OF_PINS/2)+1)*2));

	/* Setup the direction */
	tmp_val = (pin > (NUM_OF_PINS/2) - 1) ? \
		in_be32(&par_io[port].cpdir2) :
		in_be32(&par_io[port].cpdir1);

	if (pin > (NUM_OF_PINS/2) -1) {
		out_be32(&par_io[port].cpdir2, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io[port].cpdir2, pin_2bit_dir | tmp_val);
	} else {
		out_be32(&par_io[port].cpdir1, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io[port].cpdir1, pin_2bit_dir | tmp_val);
	}

	/* Calculate pin location for 1bit mask */
	pin_1bit_mask = (u32)(1 << (NUM_OF_PINS - (pin+1)));

	/* Setup the open drain */
	tmp_val = in_be32(&par_io[port].cpodr);
	if (open_drain)
		out_be32(&par_io[port].cpodr, pin_1bit_mask | tmp_val);
	else
		out_be32(&par_io[port].cpodr, ~pin_1bit_mask & tmp_val);

	/* Setup the assignment */
	tmp_val = (pin > (NUM_OF_PINS/2) - 1) ?
		in_be32(&par_io[port].cppar2):
		in_be32(&par_io[port].cppar1);
	pin_2bit_assign = (u32)(assign
				<< (NUM_OF_PINS - (pin%(NUM_OF_PINS/2)+1)*2));

	/* Clear and set 2 bits mask */
	if (pin > (NUM_OF_PINS/2) - 1) {
		out_be32(&par_io[port].cppar2, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io[port].cppar2, pin_2bit_assign | tmp_val);
	} else {
		out_be32(&par_io[port].cppar1, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io[port].cppar1, pin_2bit_assign | tmp_val);
	}
}

#endif /* CONFIG_QE */