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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * arch/arm/plat-mxc/iomux-v1.c
   4  *
   5  * Copyright (C) 2004 Sascha Hauer, Synertronixx GmbH
   6  * Copyright (C) 2009 Uwe Kleine-Koenig, Pengutronix
   7  *
   8  * Common code for i.MX1, i.MX21 and i.MX27
   9  */
  10
  11 #include <linux/errno.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16 #include <linux/gpio.h>
  17
  18 #include <asm/mach/map.h>
  19
  20 #include "hardware.h"
  21 #include "iomux-v1.h"
  22
  23 static void __iomem *imx_iomuxv1_baseaddr;
  24 static unsigned imx_iomuxv1_numports;
  25
  26 static inline unsigned long imx_iomuxv1_readl(unsigned offset)
  27 {
  28         return imx_readl(imx_iomuxv1_baseaddr + offset);
  29 }
  30
  31 static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
  32 {
  33         imx_writel(val, imx_iomuxv1_baseaddr + offset);
  34 }
  35
  36 static inline void imx_iomuxv1_rmwl(unsigned offset,
  37                 unsigned long mask, unsigned long value)
  38 {
  39         unsigned long reg = imx_iomuxv1_readl(offset);
  40
  41         reg &= ~mask;
  42         reg |= value;
  43
  44         imx_iomuxv1_writel(reg, offset);
  45 }
  46
  47 static inline void imx_iomuxv1_set_puen(
  48                 unsigned int port, unsigned int pin, int on)
  49 {
  50         unsigned long mask = 1 << pin;
  51
  52         imx_iomuxv1_rmwl(MXC_PUEN(port), mask, on ? mask : 0);
  53 }
  54
  55 static inline void imx_iomuxv1_set_ddir(
  56                 unsigned int port, unsigned int pin, int out)
  57 {
  58         unsigned long mask = 1 << pin;
  59
  60         imx_iomuxv1_rmwl(MXC_DDIR(port), mask, out ? mask : 0);
  61 }
  62
  63 static inline void imx_iomuxv1_set_gpr(
  64                 unsigned int port, unsigned int pin, int af)
  65 {
  66         unsigned long mask = 1 << pin;
  67
  68         imx_iomuxv1_rmwl(MXC_GPR(port), mask, af ? mask : 0);
  69 }
  70
  71 static inline void imx_iomuxv1_set_gius(
  72                 unsigned int port, unsigned int pin, int inuse)
  73 {
  74         unsigned long mask = 1 << pin;
  75
  76         imx_iomuxv1_rmwl(MXC_GIUS(port), mask, inuse ? mask : 0);
  77 }
  78
  79 static inline void imx_iomuxv1_set_ocr(
  80                 unsigned int port, unsigned int pin, unsigned int ocr)
  81 {
  82         unsigned long shift = (pin & 0xf) << 1;
  83         unsigned long mask = 3 << shift;
  84         unsigned long value = ocr << shift;
  85         unsigned long offset = pin < 16 ? MXC_OCR1(port) : MXC_OCR2(port);
  86
  87         imx_iomuxv1_rmwl(offset, mask, value);
  88 }
  89
  90 static inline void imx_iomuxv1_set_iconfa(
  91                 unsigned int port, unsigned int pin, unsigned int aout)
  92 {
  93         unsigned long shift = (pin & 0xf) << 1;
  94         unsigned long mask = 3 << shift;
  95         unsigned long value = aout << shift;
  96         unsigned long offset = pin < 16 ? MXC_ICONFA1(port) : MXC_ICONFA2(port);
  97
  98         imx_iomuxv1_rmwl(offset, mask, value);
  99 }
 100
 101 static inline void imx_iomuxv1_set_iconfb(
 102                 unsigned int port, unsigned int pin, unsigned int bout)
 103 {
 104         unsigned long shift = (pin & 0xf) << 1;
 105         unsigned long mask = 3 << shift;
 106         unsigned long value = bout << shift;
 107         unsigned long offset = pin < 16 ? MXC_ICONFB1(port) : MXC_ICONFB2(port);
 108
 109         imx_iomuxv1_rmwl(offset, mask, value);
 110 }
 111
 112 int mxc_gpio_mode(int gpio_mode)
 113 {
 114         unsigned int pin = gpio_mode & GPIO_PIN_MASK;
 115         unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
 116         unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
 117         unsigned int aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3;
 118         unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3;
 119
 120         if (port >= imx_iomuxv1_numports)
 121                 return -EINVAL;
 122
 123         /* Pullup enable */
 124         imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN);
 125
 126         /* Data direction */
 127         imx_iomuxv1_set_ddir(port, pin, gpio_mode & GPIO_OUT);
 128
 129         /* Primary / alternate function */
 130         imx_iomuxv1_set_gpr(port, pin, gpio_mode & GPIO_AF);
 131
 132         /* use as gpio? */
 133         imx_iomuxv1_set_gius(port, pin, !(gpio_mode & (GPIO_PF | GPIO_AF)));
 134
 135         imx_iomuxv1_set_ocr(port, pin, ocr);
 136
 137         imx_iomuxv1_set_iconfa(port, pin, aout);
 138
 139         imx_iomuxv1_set_iconfb(port, pin, bout);
 140
 141         return 0;
 142 }
 143
 144 static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
 145 {
 146         size_t i;
 147         int ret = 0;
 148
 149         for (i = 0; i < count; ++i) {
 150                 ret = mxc_gpio_mode(list[i]);
 151
 152                 if (ret)
 153                         return ret;
 154         }
 155
 156         return ret;
 157 }
 158
 159 int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
 160                 const char *label)
 161 {
 162         int ret;
 163
 164         ret = imx_iomuxv1_setup_multiple(pin_list, count);
 165         return ret;
 166 }
 167
 168 int __init imx_iomuxv1_init(void __iomem *base, int numports)
 169 {
 170         imx_iomuxv1_baseaddr = base;
 171         imx_iomuxv1_numports = numports;
 172
 173         return 0;
 174 }