mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-12 07:57:21 +00:00
106 lines
3 KiB
C
106 lines
3 KiB
C
|
/*
|
||
|
|
* DaVinci pinmux functions.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2009 Nick Thompson, GE Fanuc Ltd, <nick.thompson@gefanuc.com>
|
||
|
|
* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
|
||
|
|
* Copyright (C) 2008 Lyrtech <www.lyrtech.com>
|
||
|
|
* Copyright (C) 2004 Texas Instruments.
|
||
|
|
*
|
||
|
|
* See file CREDITS for list of people who contributed to this
|
||
|
|
* project.
|
||
|
|
*
|
||
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <common.h>
|
||
|
|
#include <asm/arch/hardware.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/arch/davinci_misc.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Change the setting of a pin multiplexer field.
|
||
|
|
*
|
||
|
|
* Takes an array of pinmux settings similar to:
|
||
|
|
*
|
||
|
|
* struct pinmux_config uart_pins[] = {
|
||
|
|
* { &davinci_syscfg_regs->pinmux[8], 2, 7 },
|
||
|
|
* { &davinci_syscfg_regs->pinmux[9], 2, 0 }
|
||
|
|
* };
|
||
|
|
*
|
||
|
|
* Stepping through the array, each pinmux[n] register has the given value
|
||
|
|
* set in the pin mux field specified.
|
||
|
|
*
|
||
|
|
* The number of pins in the array must be passed (ARRAY_SIZE can provide
|
||
|
|
* this value conveniently).
|
||
|
|
*
|
||
|
|
* Returns 0 if all field numbers and values are in the correct range,
|
||
|
|
* else returns -1.
|
||
|
|
*/
|
||
|
|
int davinci_configure_pin_mux(const struct pinmux_config *pins,
|
||
|
|
const int n_pins)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* check for invalid pinmux values */
|
||
|
|
for (i = 0; i < n_pins; i++) {
|
||
|
|
if (pins[i].field >= PIN_MUX_NUM_FIELDS ||
|
||
|
|
(pins[i].value & ~PIN_MUX_FIELD_MASK) != 0)
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* configure the pinmuxes */
|
||
|
|
for (i = 0; i < n_pins; i++) {
|
||
|
|
const int offset = pins[i].field * PIN_MUX_FIELD_SIZE;
|
||
|
|
const unsigned int value = pins[i].value << offset;
|
||
|
|
const unsigned int mask = PIN_MUX_FIELD_MASK << offset;
|
||
|
|
const dv_reg *mux = pins[i].mux;
|
||
|
|
|
||
|
|
writel(value | (readl(mux) & (~mask)), mux);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Configure multiple pinmux resources.
|
||
|
|
*
|
||
|
|
* Takes an pinmux_resource array of pinmux_config and pin counts:
|
||
|
|
*
|
||
|
|
* const struct pinmux_resource pinmuxes[] = {
|
||
|
|
* PINMUX_ITEM(uart_pins),
|
||
|
|
* PINMUX_ITEM(i2c_pins),
|
||
|
|
* };
|
||
|
|
*
|
||
|
|
* The number of items in the array must be passed (ARRAY_SIZE can provide
|
||
|
|
* this value conveniently).
|
||
|
|
*
|
||
|
|
* Each item entry is configured in the defined order. If configuration
|
||
|
|
* of any item fails, -1 is returned and none of the following items are
|
||
|
|
* configured. On success, 0 is returned.
|
||
|
|
*/
|
||
|
|
int davinci_configure_pin_mux_items(const struct pinmux_resource *item,
|
||
|
|
const int n_items)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < n_items; i++) {
|
||
|
|
if (davinci_configure_pin_mux(item[i].pins,
|
||
|
|
item[i].n_pins) != 0)
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|