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https://github.com/AsahiLinux/u-boot
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d5cc3f5241
This patch adds 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. Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* cpld-gpio-bus.c: provides support for the CPLD GPIO bus found on some LaCie
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* boards (as the 2Big/5Big Network v2 and the 2Big NAS). This parallel GPIO
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* bus exposes two registers (address and data). Each of this register is made
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* up of several dedicated GPIOs. An extra GPIO is used to notify the CPLD that
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* the registers have been updated.
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*
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* Mostly this bus is used to configure the LEDs on LaCie boards.
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*
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* Copyright (C) 2013 Simon Guinot <simon.guinot@sequanux.org>
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <asm/arch/gpio.h>
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#include "cpld-gpio-bus.h"
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static void cpld_gpio_bus_set_addr(struct cpld_gpio_bus *bus, unsigned addr)
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{
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int pin;
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for (pin = 0; pin < bus->num_addr; pin++)
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kw_gpio_set_value(bus->addr[pin], (addr >> pin) & 1);
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}
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static void cpld_gpio_bus_set_data(struct cpld_gpio_bus *bus, unsigned data)
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{
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int pin;
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for (pin = 0; pin < bus->num_data; pin++)
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kw_gpio_set_value(bus->data[pin], (data >> pin) & 1);
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}
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static void cpld_gpio_bus_enable_select(struct cpld_gpio_bus *bus)
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{
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/* The transfer is enabled on the raising edge. */
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kw_gpio_set_value(bus->enable, 0);
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kw_gpio_set_value(bus->enable, 1);
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}
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void cpld_gpio_bus_write(struct cpld_gpio_bus *bus,
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unsigned addr, unsigned value)
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{
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cpld_gpio_bus_set_addr(bus, addr);
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cpld_gpio_bus_set_data(bus, value);
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cpld_gpio_bus_enable_select(bus);
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}
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