u-boot/arch/powerpc/cpu/mpc83xx/qe_io.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2006 Freescale Semiconductor, Inc.
 *
 * Dave Liu <daveliu@freescale.com>
 * based on source code of Shlomi Gridish
 */

#include <common.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/immap_83xx.h>

#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 *)CONFIG_SYS_IMMR;
	volatile qepio83xx_t	*par_io = (volatile qepio83xx_t *)&im->qepio;

	/* Calculate 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->ioport[port].dir2) :
		in_be32(&par_io->ioport[port].dir1);

	if (pin > (NUM_OF_PINS/2) -1) {
		out_be32(&par_io->ioport[port].dir2, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io->ioport[port].dir2, pin_2bit_dir | tmp_val);
	} else {
		out_be32(&par_io->ioport[port].dir1, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io->ioport[port].dir1, 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->ioport[port].podr);
	if (open_drain) {
		out_be32(&par_io->ioport[port].podr, pin_1bit_mask | tmp_val);
	} else {
		out_be32(&par_io->ioport[port].podr, ~pin_1bit_mask & tmp_val);
	}

	/* Setup the assignment */
	tmp_val = (pin > (NUM_OF_PINS/2) - 1) ?
		in_be32(&par_io->ioport[port].ppar2):
		in_be32(&par_io->ioport[port].ppar1);
	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->ioport[port].ppar2, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io->ioport[port].ppar2, pin_2bit_assign | tmp_val);
	} else {
		out_be32(&par_io->ioport[port].ppar1, ~pin_2bit_mask & tmp_val);
		out_be32(&par_io->ioport[port].ppar1, pin_2bit_assign | tmp_val);
	}
}