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 --- board/LaCie/common/cpld-gpio-bus.c | 50 ++++++++++++++++++++++++++++++++++++ board/LaCie/common/cpld-gpio-bus.h | 24 +++++++++++++++++ 2 files changed, 74 insertions(+) create mode 100644 board/LaCie/common/cpld-gpio-bus.c create mode 100644 board/LaCie/common/cpld-gpio-bus.h
Changes in v2: - Rename gpio-ext into cpld-gpio-bus and adjust code and comments accordingly.
diff --git a/board/LaCie/common/cpld-gpio-bus.c b/board/LaCie/common/cpld-gpio-bus.c new file mode 100644 index 0000000..fb9bf8d --- /dev/null +++ b/board/LaCie/common/cpld-gpio-bus.c @@ -0,0 +1,50 @@ +/* + * 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 + * + * 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. + */ + +#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); +} diff --git a/board/LaCie/common/cpld-gpio-bus.h b/board/LaCie/common/cpld-gpio-bus.h new file mode 100644 index 0000000..e9e9b96 --- /dev/null +++ b/board/LaCie/common/cpld-gpio-bus.h @@ -0,0 +1,24 @@ +/* + * Copyright (C) 2013 Simon Guinot simon.guinot@sequanux.org + * + * 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. + */ + +#ifndef _LACIE_CPLD_GPI0_BUS_H +#define _LACIE_CPLD_GPI0_BUS_H + +struct cpld_gpio_bus { + unsigned *addr; + unsigned num_addr; + unsigned *data; + unsigned num_data; + unsigned enable; +}; + +void cpld_gpio_bus_write(struct cpld_gpio_bus *cpld_gpio_bus, + unsigned addr, unsigned value); + +#endif /* _LACIE_CPLD_GPI0_BUS_H */