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
imx_iomuxv1_readl(unsigned offset)39 static inline unsigned long imx_iomuxv1_readl(unsigned offset)
40 {
41 return __raw_readl(imx_iomuxv1_baseaddr + offset);
42 }
43
imx_iomuxv1_writel(unsigned long val,unsigned offset)44 static inline void imx_iomuxv1_writel(unsigned long val, unsigned offset)
45 {
46 __raw_writel(val, imx_iomuxv1_baseaddr + offset);
47 }
48
imx_iomuxv1_rmwl(unsigned offset,unsigned long mask,unsigned long value)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
imx_iomuxv1_set_puen(unsigned int port,unsigned int pin,int on)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
imx_iomuxv1_set_ddir(unsigned int port,unsigned int pin,int out)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
imx_iomuxv1_set_gpr(unsigned int port,unsigned int pin,int af)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
imx_iomuxv1_set_gius(unsigned int port,unsigned int pin,int inuse)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
imx_iomuxv1_set_ocr(unsigned int port,unsigned int pin,unsigned int ocr)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
imx_iomuxv1_set_iconfa(unsigned int port,unsigned int pin,unsigned int aout)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
imx_iomuxv1_set_iconfb(unsigned int port,unsigned int pin,unsigned int bout)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
mxc_gpio_mode(int gpio_mode)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
imx_iomuxv1_setup_multiple(const int * list,unsigned count)157 static 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
mxc_gpio_setup_multiple_pins(const int * pin_list,unsigned count,const char * label)172 int 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
imx_iomuxv1_init(void __iomem * base,int numports)181 int __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