LXR linux/arch/arm/mach-imx/iomux-v1.c

   1/*
   2 * arch/arm/plat-mxc/iomux-v1.c
   3 *
   4 * Copyright (C) 2004 Sascha Hauer, Synertronixx GmbH
   5 * Copyright (C) 2009 Uwe Kleine-Koenig, Pengutronix
   6 *
   7 * Common code for i.MX1, i.MX21 and i.MX27
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software Foundation, Inc.,
  21 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  22 */
  23
  24#include <linux/errno.h>
  25#include <linux/init.h>
  26#include <linux/kernel.h>
  27#include <linux/module.h>
  28#include <linux/string.h>
  29#include <linux/gpio.h>
  30
  31#include <asm/mach/map.h>
  32
  33#include "hardware.h"
  34#include "iomux-v1.h"
  35
  36static void __iomem *imx_iomuxv1_baseaddr;
  37static unsigned imx_iomuxv1_numports;
  38
  39static inline unsigned long imx_iomuxv1_readl(unsigned offset)
  40{
  41        return imx_readl(imx_iomuxv1_baseaddr + offset);
  42}
  43
  44static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
  45{
  46        imx_writel(val, imx_iomuxv1_baseaddr + offset);
  47}
  48
  49static inline void imx_iomuxv1_rmwl(unsigned offset,
  50                unsigned long mask, unsigned long value)
  51{
  52        unsigned long reg = imx_iomuxv1_readl(offset);
  53
  54        reg &= ~mask;
  55        reg |= value;
  56
  57        imx_iomuxv1_writel(reg, offset);
  58}
  59
  60static inline void imx_iomuxv1_set_puen(
  61                unsigned int port, unsigned int pin, int on)
  62{
  63        unsigned long mask = 1 << pin;
  64
  65        imx_iomuxv1_rmwl(MXC_PUEN(port), mask, on ? mask : 0);
  66}
  67
  68static inline void imx_iomuxv1_set_ddir(
  69                unsigned int port, unsigned int pin, int out)
  70{
  71        unsigned long mask = 1 << pin;
  72
  73        imx_iomuxv1_rmwl(MXC_DDIR(port), mask, out ? mask : 0);
  74}
  75
  76static inline void imx_iomuxv1_set_gpr(
  77                unsigned int port, unsigned int pin, int af)
  78{
  79        unsigned long mask = 1 << pin;
  80
  81        imx_iomuxv1_rmwl(MXC_GPR(port), mask, af ? mask : 0);
  82}
  83
  84static inline void imx_iomuxv1_set_gius(
  85                unsigned int port, unsigned int pin, int inuse)
  86{
  87        unsigned long mask = 1 << pin;
  88
  89        imx_iomuxv1_rmwl(MXC_GIUS(port), mask, inuse ? mask : 0);
  90}
  91
  92static inline void imx_iomuxv1_set_ocr(
  93                unsigned int port, unsigned int pin, unsigned int ocr)
  94{
  95        unsigned long shift = (pin & 0xf) << 1;
  96        unsigned long mask = 3 << shift;
  97        unsigned long value = ocr << shift;
  98        unsigned long offset = pin < 16 ? MXC_OCR1(port) : MXC_OCR2(port);
  99
 100        imx_iomuxv1_rmwl(offset, mask, value);
 101}
 102
 103static inline void imx_iomuxv1_set_iconfa(
 104                unsigned int port, unsigned int pin, unsigned int aout)
 105{
 106        unsigned long shift = (pin & 0xf) << 1;
 107        unsigned long mask = 3 << shift;
 108        unsigned long value = aout << shift;
 109        unsigned long offset = pin < 16 ? MXC_ICONFA1(port) : MXC_ICONFA2(port);
 110
 111        imx_iomuxv1_rmwl(offset, mask, value);
 112}
 113
 114static inline void imx_iomuxv1_set_iconfb(
 115                unsigned int port, unsigned int pin, unsigned int bout)
 116{
 117        unsigned long shift = (pin & 0xf) << 1;
 118        unsigned long mask = 3 << shift;
 119        unsigned long value = bout << shift;
 120        unsigned long offset = pin < 16 ? MXC_ICONFB1(port) : MXC_ICONFB2(port);
 121
 122        imx_iomuxv1_rmwl(offset, mask, value);
 123}
 124
 125int mxc_gpio_mode(int gpio_mode)
 126{
 127        unsigned int pin = gpio_mode & GPIO_PIN_MASK;
 128        unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
 129        unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
 130        unsigned int aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3;
 131        unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3;
 132
 133        if (port >= imx_iomuxv1_numports)
 134                return -EINVAL;
 135
 136        /* Pullup enable */
 137        imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN);
 138
 139        /* Data direction */
 140        imx_iomuxv1_set_ddir(port, pin, gpio_mode & GPIO_OUT);
 141
 142        /* Primary / alternate function */
 143        imx_iomuxv1_set_gpr(port, pin, gpio_mode & GPIO_AF);
 144
 145        /* use as gpio? */
 146        imx_iomuxv1_set_gius(port, pin, !(gpio_mode & (GPIO_PF | GPIO_AF)));
 147
 148        imx_iomuxv1_set_ocr(port, pin, ocr);
 149
 150        imx_iomuxv1_set_iconfa(port, pin, aout);
 151
 152        imx_iomuxv1_set_iconfb(port, pin, bout);
 153
 154        return 0;
 155}
 156
 157static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
 158{
 159        size_t i;
 160        int ret = 0;
 161
 162        for (i = 0; i < count; ++i) {
 163                ret = mxc_gpio_mode(list[i]);
 164
 165                if (ret)
 166                        return ret;
 167        }
 168
 169        return ret;
 170}
 171
 172int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 173                const char *label)
 174{
 175        int ret;
 176
 177        ret = imx_iomuxv1_setup_multiple(pin_list, count);
 178        return ret;
 179}
 180
 181int __init imx_iomuxv1_init(void __iomem *base, int numports)
 182{
 183        imx_iomuxv1_baseaddr = base;
 184        imx_iomuxv1_numports = numports;
 185
 186        return 0;
 187}
 188