To ease the implementation of other MPC85xx board ports, several common GPIO helpers are added to <asm/mpc85xx_gpio.h>.
Since each of these compiles to no more than 4-5 instructions it would be very inefficient to call them out of line, therefore we put them entirely in the header file.
Signed-off-by: Kyle Moffett Kyle.D.Moffett@boeing.com --- arch/powerpc/include/asm/mpc85xx_gpio.h | 67 +++++++++++++++++++++++++++++++ 1 files changed, 67 insertions(+), 0 deletions(-) create mode 100644 arch/powerpc/include/asm/mpc85xx_gpio.h
diff --git a/arch/powerpc/include/asm/mpc85xx_gpio.h b/arch/powerpc/include/asm/mpc85xx_gpio.h new file mode 100644 index 0000000..dc6bfb2 --- /dev/null +++ b/arch/powerpc/include/asm/mpc85xx_gpio.h @@ -0,0 +1,67 @@ +/* + * Copyright 2010 eXMeritus, A Boeing Company + * + * 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 <asm/immap_85xx.h> + +static inline void mpc85xx_gpio_set(unsigned int mask, + unsigned int dir, unsigned int val) +{ + volatile ccsr_gpio_t *gpio; + + /* First mask off the unwanted parts of "dir" and "val" */ + dir &= mask; + val &= mask; + + /* Now read in the values we're supposed to preserve */ + gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR + 0xc00); + dir |= (in_be32(&gpio->gpdir) & ~mask); + val |= (in_be32(&gpio->gpdat) & ~mask); + + /* Now write out the new values, writing the direction first */ + out_be32(&gpio->gpdir, dir); + asm("sync; isync":::"memory"); + out_be32(&gpio->gpdat, val); +} + +static inline void mpc85xx_gpio_set_in(unsigned int gpios) +{ + mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000); +} + +static inline void mpc85xx_gpio_set_low(unsigned int gpios) +{ + mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000); +} + +static inline void mpc85xx_gpio_set_high(unsigned int gpios) +{ + mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF); +} + +static inline unsigned int mpc85xx_gpio_get(unsigned int mask) +{ + volatile ccsr_gpio_t *gpio; + unsigned int ret; + + /* Read the requested values */ + gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR + 0xc00); + ret = mask & in_be32(&gpio->gpdat); + + return ret; +}