mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
|
|
* cpld-gpio-bus.c: provides support for the CPLD GPIO bus found on some LaCie
|
|
* boards (as the 2Big/5Big Network v2 and the 2Big NAS). This parallel GPIO
|
|
* bus exposes two registers (address and data). Each of this register is made
|
|
* up of several dedicated GPIOs. An extra GPIO is used to notify the CPLD that
|
|
* the registers have been updated.
|
|
*
|
|
* Mostly this bus is used to configure the LEDs on LaCie boards.
|
|
*
|
|
* Copyright (C) 2013 Simon Guinot <simon.guinot@sequanux.org>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm/arch/gpio.h>
|
|
#include "cpld-gpio-bus.h"
|
|
|
|
static void cpld_gpio_bus_set_addr(struct cpld_gpio_bus *bus, unsigned addr)
|
|
{
|
|
int pin;
|
|
|
|
for (pin = 0; pin < bus->num_addr; pin++)
|
|
kw_gpio_set_value(bus->addr[pin], (addr >> pin) & 1);
|
|
}
|
|
|
|
static void cpld_gpio_bus_set_data(struct cpld_gpio_bus *bus, unsigned data)
|
|
{
|
|
int pin;
|
|
|
|
for (pin = 0; pin < bus->num_data; pin++)
|
|
kw_gpio_set_value(bus->data[pin], (data >> pin) & 1);
|
|
}
|
|
|
|
static void cpld_gpio_bus_enable_select(struct cpld_gpio_bus *bus)
|
|
{
|
|
/* The transfer is enabled on the raising edge. */
|
|
kw_gpio_set_value(bus->enable, 0);
|
|
kw_gpio_set_value(bus->enable, 1);
|
|
}
|
|
|
|
void cpld_gpio_bus_write(struct cpld_gpio_bus *bus,
|
|
unsigned addr, unsigned value)
|
|
{
|
|
cpld_gpio_bus_set_addr(bus, addr);
|
|
cpld_gpio_bus_set_data(bus, value);
|
|
cpld_gpio_bus_enable_select(bus);
|
|
}
|