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
  36 static void __iomem *imx_iomuxv1_baseaddr;
  37 static unsigned imx_iomuxv1_numports;
  38
  39 static inline unsigned long imx_iomuxv1_readl(unsigned offset)
  40 {
  41         return __raw_readl(imx_iomuxv1_baseaddr + offset);
  42 }
  43
  44 static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
  45 {
  46         __raw_writel(val, imx_iomuxv1_baseaddr + offset);
  47 }
  48
  49 static 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
  60 static 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
  68 static 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
  76 static 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
  84 static 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
  92 static 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
 103 static 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
 114 static 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
 125 int 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 EXPORT_SYMBOL(mxc_gpio_mode);
 157
 158 static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
 159 {
 160         size_t i;
 161         int ret = 0;
 162
 163         for (i = 0; i < count; ++i) {
 164                 ret = mxc_gpio_mode(list[i]);
 165
 166                 if (ret)
 167                         return ret;
 168         }
 169
 170         return ret;
 171 }
 172
 173 int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 174                 const char *label)
 175 {
 176         int ret;
 177
 178         ret = imx_iomuxv1_setup_multiple(pin_list, count);
 179         return ret;
 180 }
 181 EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
 182
 183 int __init imx_iomuxv1_init(void __iomem *base, int numports)
 184 {
 185         imx_iomuxv1_baseaddr = base;
 186         imx_iomuxv1_numports = numports;
 187
 188         return 0;
 189 }