| /* |
| * Copyright 2012 Google Inc. |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| #include <assert.h> |
| #include <pci.h> |
| #include <stdint.h> |
| |
| #include "base/container_of.h" |
| #include "base/io.h" |
| #include "base/xalloc.h" |
| #include "drivers/gpio/gpio.h" |
| #include "drivers/gpio/lynxpoint_lp.h" |
| |
| static inline uint16_t lp_gpio_conf0(unsigned num) |
| { |
| return 0x100 + num * 8; |
| } |
| |
| enum { |
| LpGpioConf0ModeBit = 1 << 0, |
| LpGpioConf0DirBit = 1 << 2, |
| LpGpioConf0GpiBit = 1 << 30, |
| LpGpioConf0GpoBit = 1 << 31 |
| }; |
| |
| /* Functions for manipulating GPIO regs. */ |
| |
| uint16_t lp_pch_gpio_base_uncached(void) |
| { |
| static const uint32_t dev = PCI_DEV(0, 0x1f, 0); |
| static const uint8_t pci_cfg_gpio_base = 0x48; |
| |
| uint16_t base = pci_read_config32(dev, pci_cfg_gpio_base); |
| // Drop the IO space bit. |
| return base & ~0x1; |
| } |
| |
| static uint16_t pch_gpio_base(void) |
| { |
| static uint32_t base = ~(uint32_t)0; |
| |
| if (base == ~(uint32_t)0) |
| base = lp_pch_gpio_base_uncached(); |
| |
| return base; |
| } |
| |
| void lp_pch_gpio_set_addr(LpPchGpio *gpio, uint16_t gpio_base) |
| { |
| gpio->addr = gpio_base + lp_gpio_conf0(gpio->num); |
| } |
| |
| static void pch_gpio_set(uint16_t addr, uint32_t bit, int val) |
| { |
| uint32_t conf = inl(addr); |
| if (val) |
| conf |= bit; |
| else |
| conf &= ~bit; |
| outl(conf, addr); |
| } |
| |
| static int pch_gpio_get(uint16_t addr, uint32_t bit) |
| { |
| return !!(inl(addr) & bit); |
| } |
| |
| |
| /* Interface functions for manipulating a GPIO. */ |
| |
| static int lp_pch_gpio_get_value(GpioOps *me) |
| { |
| assert(me); |
| LpPchGpio *gpio = container_of(me, LpPchGpio, ops); |
| |
| if (!gpio->addr) |
| gpio->addr = pch_gpio_base() + lp_gpio_conf0(gpio->num); |
| if (!gpio->dir_set) { |
| pch_gpio_set(gpio->addr, LpGpioConf0DirBit, 1); |
| gpio->dir_set = 1; |
| } |
| |
| return pch_gpio_get(gpio->addr, LpGpioConf0GpiBit); |
| } |
| |
| static int lp_pch_gpio_set_value(GpioOps *me, unsigned value) |
| { |
| assert(me); |
| LpPchGpio *gpio = container_of(me, LpPchGpio, ops); |
| |
| if (!gpio->addr) |
| gpio->addr = pch_gpio_base() + lp_gpio_conf0(gpio->num); |
| if (!gpio->dir_set) { |
| pch_gpio_set(gpio->addr, LpGpioConf0DirBit, 0); |
| gpio->dir_set = 1; |
| } |
| |
| pch_gpio_set(gpio->addr, LpGpioConf0GpoBit, value); |
| |
| return 0; |
| } |
| |
| static int lp_pch_gpio_use(LpPchGpio *gpio, unsigned use) |
| { |
| assert(gpio); |
| |
| if (!gpio->addr) |
| gpio->addr = pch_gpio_base() + lp_gpio_conf0(gpio->num); |
| |
| pch_gpio_set(gpio->addr, LpGpioConf0ModeBit, use); |
| |
| return 0; |
| } |
| |
| |
| /* Functions to set up a GPIO structure which has already been allocated. */ |
| |
| void init_lp_pch_gpio(LpPchGpio *gpio, unsigned num) |
| { |
| gpio->use = &lp_pch_gpio_use; |
| gpio->num = num; |
| } |
| |
| void init_lp_pch_gpio_input(LpPchGpio *gpio, unsigned num) |
| { |
| init_lp_pch_gpio(gpio, num); |
| gpio->ops.get = &lp_pch_gpio_get_value; |
| } |
| |
| void init_lp_pch_gpio_output(LpPchGpio *gpio, unsigned num) |
| { |
| init_lp_pch_gpio(gpio, num); |
| gpio->ops.set = &lp_pch_gpio_set_value; |
| } |
| |
| |
| /* Functions to allocate and set up a GPIO structure. */ |
| |
| LpPchGpio *new_lp_pch_gpio(unsigned num) |
| { |
| LpPchGpio *gpio = xzalloc(sizeof(*gpio)); |
| init_lp_pch_gpio(gpio, num); |
| return gpio; |
| } |
| |
| LpPchGpio *new_lp_pch_gpio_input(unsigned num) |
| { |
| LpPchGpio *gpio = xzalloc(sizeof(*gpio)); |
| init_lp_pch_gpio_input(gpio, num); |
| return gpio; |
| } |
| |
| LpPchGpio *new_lp_pch_gpio_output(unsigned num) |
| { |
| LpPchGpio *gpio = xzalloc(sizeof(*gpio)); |
| init_lp_pch_gpio_output(gpio, num); |
| return gpio; |
| } |