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

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  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 }
190 

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