diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc512x/iopin.c')
-rw-r--r-- | arch/powerpc/cpu/mpc512x/iopin.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc512x/iopin.c b/arch/powerpc/cpu/mpc512x/iopin.c new file mode 100644 index 0000000..1a39101 --- /dev/null +++ b/arch/powerpc/cpu/mpc512x/iopin.c @@ -0,0 +1,103 @@ +/* + * (C) Copyright 2008 + * Martha J Marx, Silicon Turnkey Express, mmarx@silicontkx.com + * mpc512x I/O pin/pad initialization for the ADS5121 board + * 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 <common.h> +#include <linux/types.h> +#include <asm/io.h> + +void iopin_initialize(iopin_t *ioregs_init, int len) +{ + short i, j, p; + u32 *reg; + immap_t *im = (immap_t *)CONFIG_SYS_IMMR; + + reg = (u32 *)&(im->io_ctrl); + + if (sizeof(ioregs_init) == 0) + return; + + for (i = 0; i < len; i++) { + for (p = 0, j = ioregs_init[i].p_offset / sizeof(u_long); + p < ioregs_init[i].nr_pins; p++, j++) { + if (ioregs_init[i].bit_or) + setbits_be32(reg + j, ioregs_init[i].val); + else + out_be32 (reg + j, ioregs_init[i].val); + } + } + return; +} + +void iopin_initialize_bits(iopin_t *ioregs_init, int len) +{ + short i, j, p; + u32 *reg, mask; + immap_t *im = (immap_t *)CONFIG_SYS_IMMR; + + reg = (u32 *)&(im->io_ctrl); + + /* iterate over table entries */ + for (i = 0; i < len; i++) { + /* iterate over pins within a table entry */ + for (p = 0, j = ioregs_init[i].p_offset / sizeof(u_long); + p < ioregs_init[i].nr_pins; p++, j++) { + if (ioregs_init[i].bit_or & IO_PIN_OVER_EACH) { + /* replace all settings at once */ + out_be32(reg + j, ioregs_init[i].val); + } else { + /* + * only replace individual parts, but + * REPLACE them instead of just ORing + * them in and "inheriting" previously + * set bits which we don't want + */ + mask = 0; + if (ioregs_init[i].bit_or & IO_PIN_OVER_FMUX) + mask |= IO_PIN_FMUX(3); + + if (ioregs_init[i].bit_or & IO_PIN_OVER_HOLD) + mask |= IO_PIN_HOLD(3); + + if (ioregs_init[i].bit_or & IO_PIN_OVER_PULL) + mask |= IO_PIN_PUD(1) | IO_PIN_PUE(1); + + if (ioregs_init[i].bit_or & IO_PIN_OVER_STRIG) + mask |= IO_PIN_ST(1); + + if (ioregs_init[i].bit_or & IO_PIN_OVER_DRVSTR) + mask |= IO_PIN_DS(3); + /* + * DON'T do the "mask, then insert" + * in place on the register, it may + * break access to external hardware + * (like boot ROMs) when configuring + * LPB related pins, while the code to + * configure the pin is read from this + * very address region + */ + clrsetbits_be32(reg + j, mask, + ioregs_init[i].val & mask); + } + } + } +} |