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author | Wolfgang Denk <wd@denx.de> | 2010-12-22 21:16:17 +0100 |
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committer | Wolfgang Denk <wd@denx.de> | 2010-12-22 21:16:17 +0100 |
commit | cdc51c294ad33879c4e57edf4c9d2155381b1d59 (patch) | |
tree | fc1c3f2c23a2507e91358a6a6dfa881965bf603f /board/davinci/common/davinci_pinmux.c | |
parent | 250ef029844be2cb98635f265359396866d1749f (diff) | |
parent | b8339e2b9f32663411dba0f48e25b23f542d53bc (diff) | |
download | u-boot-imx-cdc51c294ad33879c4e57edf4c9d2155381b1d59.zip u-boot-imx-cdc51c294ad33879c4e57edf4c9d2155381b1d59.tar.gz u-boot-imx-cdc51c294ad33879c4e57edf4c9d2155381b1d59.tar.bz2 |
Merge branch 'next' of ../next
Diffstat (limited to 'board/davinci/common/davinci_pinmux.c')
-rw-r--r-- | board/davinci/common/davinci_pinmux.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/board/davinci/common/davinci_pinmux.c b/board/davinci/common/davinci_pinmux.c new file mode 100644 index 0000000..ce58f71 --- /dev/null +++ b/board/davinci/common/davinci_pinmux.c @@ -0,0 +1,105 @@ +/* + * DaVinci pinmux functions. + * + * Copyright (C) 2009 Nick Thompson, GE Fanuc Ltd, <nick.thompson@gefanuc.com> + * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> + * Copyright (C) 2008 Lyrtech <www.lyrtech.com> + * Copyright (C) 2004 Texas Instruments. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <common.h> +#include <asm/arch/hardware.h> +#include <asm/io.h> +#include <asm/arch/davinci_misc.h> + +/* + * Change the setting of a pin multiplexer field. + * + * Takes an array of pinmux settings similar to: + * + * struct pinmux_config uart_pins[] = { + * { &davinci_syscfg_regs->pinmux[8], 2, 7 }, + * { &davinci_syscfg_regs->pinmux[9], 2, 0 } + * }; + * + * Stepping through the array, each pinmux[n] register has the given value + * set in the pin mux field specified. + * + * The number of pins in the array must be passed (ARRAY_SIZE can provide + * this value conveniently). + * + * Returns 0 if all field numbers and values are in the correct range, + * else returns -1. + */ +int davinci_configure_pin_mux(const struct pinmux_config *pins, + const int n_pins) +{ + int i; + + /* check for invalid pinmux values */ + for (i = 0; i < n_pins; i++) { + if (pins[i].field >= PIN_MUX_NUM_FIELDS || + (pins[i].value & ~PIN_MUX_FIELD_MASK) != 0) + return -1; + } + + /* configure the pinmuxes */ + for (i = 0; i < n_pins; i++) { + const int offset = pins[i].field * PIN_MUX_FIELD_SIZE; + const unsigned int value = pins[i].value << offset; + const unsigned int mask = PIN_MUX_FIELD_MASK << offset; + const dv_reg *mux = pins[i].mux; + + writel(value | (readl(mux) & (~mask)), mux); + } + + return 0; +} + +/* + * Configure multiple pinmux resources. + * + * Takes an pinmux_resource array of pinmux_config and pin counts: + * + * const struct pinmux_resource pinmuxes[] = { + * PINMUX_ITEM(uart_pins), + * PINMUX_ITEM(i2c_pins), + * }; + * + * The number of items in the array must be passed (ARRAY_SIZE can provide + * this value conveniently). + * + * Each item entry is configured in the defined order. If configuration + * of any item fails, -1 is returned and none of the following items are + * configured. On success, 0 is returned. + */ +int davinci_configure_pin_mux_items(const struct pinmux_resource *item, + const int n_items) +{ + int i; + + for (i = 0; i < n_items; i++) { + if (davinci_configure_pin_mux(item[i].pins, + item[i].n_pins) != 0) + return -1; + } + + return 0; +} |