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author | Otavio Salvador <otavio@ossystems.com.br> | 2012-08-05 09:05:29 +0000 |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-09-01 14:58:17 +0200 |
commit | 3a0398d7b916eed6ae80427626f0434690ca0da0 (patch) | |
tree | 6df395fa52909a8977f38df93533a1a5a701df9d /arch/arm/cpu/arm926ejs/mxs/iomux.c | |
parent | d369d53d9c438a5d0df157586dcd072de48d9631 (diff) | |
download | u-boot-imx-3a0398d7b916eed6ae80427626f0434690ca0da0.zip u-boot-imx-3a0398d7b916eed6ae80427626f0434690ca0da0.tar.gz u-boot-imx-3a0398d7b916eed6ae80427626f0434690ca0da0.tar.bz2 |
mxs: reorganize source directory for easy sharing of code in i.MXS SoCs
Most code can be shared between i.MX23 and i.MX28 as both are from
i.MXS family; this source directory structure makes easy to share code
among them.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'arch/arm/cpu/arm926ejs/mxs/iomux.c')
-rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/iomux.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/iomux.c b/arch/arm/cpu/arm926ejs/mxs/iomux.c new file mode 100644 index 0000000..12916b6 --- /dev/null +++ b/arch/arm/cpu/arm926ejs/mxs/iomux.c @@ -0,0 +1,109 @@ +/* + * Copyright 2004-2006,2010 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de> + * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH, + * <armlinux@phytec.de> + * + * 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., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301, USA. + */ + +#include <common.h> +#include <asm/errno.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <asm/arch/iomux.h> +#include <asm/arch/imx-regs.h> + +#if defined(CONFIG_MX23) +#define DRIVE_OFFSET 0x200 +#define PULL_OFFSET 0x400 +#elif defined(CONFIG_MX28) +#define DRIVE_OFFSET 0x300 +#define PULL_OFFSET 0x600 +#else +#error "Please select CONFIG_MX23 or CONFIG_MX28" +#endif + +/* + * configures a single pad in the iomuxer + */ +int mxs_iomux_setup_pad(iomux_cfg_t pad) +{ + u32 reg, ofs, bp, bm; + void *iomux_base = (void *)MXS_PINCTRL_BASE; + struct mx28_register_32 *mxs_reg; + + /* muxsel */ + ofs = 0x100; + ofs += PAD_BANK(pad) * 0x20 + PAD_PIN(pad) / 16 * 0x10; + bp = PAD_PIN(pad) % 16 * 2; + bm = 0x3 << bp; + reg = readl(iomux_base + ofs); + reg &= ~bm; + reg |= PAD_MUXSEL(pad) << bp; + writel(reg, iomux_base + ofs); + + /* drive */ + ofs = DRIVE_OFFSET; + ofs += PAD_BANK(pad) * 0x40 + PAD_PIN(pad) / 8 * 0x10; + /* mA */ + if (PAD_MA_VALID(pad)) { + bp = PAD_PIN(pad) % 8 * 4; + bm = 0x3 << bp; + reg = readl(iomux_base + ofs); + reg &= ~bm; + reg |= PAD_MA(pad) << bp; + writel(reg, iomux_base + ofs); + } + /* vol */ + if (PAD_VOL_VALID(pad)) { + bp = PAD_PIN(pad) % 8 * 4 + 2; + mxs_reg = (struct mx28_register_32 *)(iomux_base + ofs); + if (PAD_VOL(pad)) + writel(1 << bp, &mxs_reg->reg_set); + else + writel(1 << bp, &mxs_reg->reg_clr); + } + + /* pull */ + if (PAD_PULL_VALID(pad)) { + ofs = PULL_OFFSET; + ofs += PAD_BANK(pad) * 0x10; + bp = PAD_PIN(pad); + mxs_reg = (struct mx28_register_32 *)(iomux_base + ofs); + if (PAD_PULL(pad)) + writel(1 << bp, &mxs_reg->reg_set); + else + writel(1 << bp, &mxs_reg->reg_clr); + } + + return 0; +} + +int mxs_iomux_setup_multiple_pads(const iomux_cfg_t *pad_list, unsigned count) +{ + const iomux_cfg_t *p = pad_list; + int i; + int ret; + + for (i = 0; i < count; i++) { + ret = mxs_iomux_setup_pad(*p); + if (ret) + return ret; + p++; + } + + return 0; +} |