diff options
author | Tom Rini <trini@ti.com> | 2013-06-22 07:38:12 -0400 |
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committer | Tom Rini <trini@ti.com> | 2013-06-22 07:38:12 -0400 |
commit | 348e47f766ac228fb02d1af562b2e9a4c69355db (patch) | |
tree | 778ffb90bb670f45fa7a0dae78010c8128c4d84d /board/LaCie/common | |
parent | 5707233880090f785c33df32c04549ea1aeef61e (diff) | |
parent | fbf87b1823dd5ebc2a384711ea2c677543019ece (diff) |
Merge branch 'master' of git://git.denx.de/u-boot-arm
Diffstat (limited to 'board/LaCie/common')
-rw-r--r-- | board/LaCie/common/cpld-gpio-bus.c | 50 | ||||
-rw-r--r-- | board/LaCie/common/cpld-gpio-bus.h | 24 |
2 files changed, 74 insertions, 0 deletions
diff --git a/board/LaCie/common/cpld-gpio-bus.c b/board/LaCie/common/cpld-gpio-bus.c new file mode 100644 index 00000000000..fb9bf8d5dbc --- /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 00000000000..e9e9b96041d --- /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 */ |