2 * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
20 #include <linux/module.h>
21 #include <linux/spinlock.h>
23 #include <linux/gpio.h>
24 #include <asm/hardware.h>
25 #include <asm/arch/gpio.h>
26 #include <asm/arch/iomux-mx3.h>
29 * IOMUX register (base) addresses
31 #define IOMUX_BASE IO_ADDRESS(IOMUXC_BASE_ADDR)
32 #define IOMUXINT_OBS1 (IOMUX_BASE + 0x000)
33 #define IOMUXINT_OBS2 (IOMUX_BASE + 0x004)
34 #define IOMUXGPR (IOMUX_BASE + 0x008)
35 #define IOMUXSW_MUX_CTL (IOMUX_BASE + 0x00C)
36 #define IOMUXSW_PAD_CTL (IOMUX_BASE + 0x154)
38 static DEFINE_SPINLOCK(gpio_mux_lock);
40 #define IOMUX_REG_MASK (IOMUX_PADNUM_MASK & ~0x3)
42 * set the mode for a IOMUX pin.
44 int mxc_iomux_mode(unsigned int pin_mode)
46 u32 reg, field, l, mode, ret = 0;
48 reg = IOMUXSW_MUX_CTL + (pin_mode & IOMUX_REG_MASK);
49 field = pin_mode & 0x3;
50 mode = (pin_mode & IOMUX_MODE_MASK) >> IOMUX_MODE_SHIFT;
52 pr_debug("%s: reg offset = 0x%x field = %d mode = 0x%02x\n",
53 __func__, (pin_mode & IOMUX_REG_MASK), field, mode);
55 spin_lock(&gpio_mux_lock);
58 l &= ~(0xff << (field * 8));
59 l |= mode << (field * 8);
62 spin_unlock(&gpio_mux_lock);
66 EXPORT_SYMBOL(mxc_iomux_mode);
69 * This function configures the pad value for a IOMUX pin.
71 void mxc_iomux_set_pad(enum iomux_pins pin, u32 config)
75 reg = IOMUXSW_PAD_CTL + (pin + 2) / 3;
76 field = (pin + 2) % 3;
78 pr_debug("%s: reg offset = 0x%x field = %d\n",
79 __func__, (pin + 2) / 3, field);
81 spin_lock(&gpio_mux_lock);
84 l &= ~(0x1ff << (field * 9));
85 l |= config << (field * 9);
88 spin_unlock(&gpio_mux_lock);
90 EXPORT_SYMBOL(mxc_iomux_set_pad);
93 * This function enables/disables the general purpose function for a particular
96 void mxc_iomux_set_gpr(enum iomux_gp_func gp, bool en)
100 spin_lock(&gpio_mux_lock);
101 l = __raw_readl(IOMUXGPR);
107 __raw_writel(l, IOMUXGPR);
108 spin_unlock(&gpio_mux_lock);
110 EXPORT_SYMBOL(mxc_iomux_set_gpr);