1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* Freescale STMP37XX/STMP378X Pin Multiplexing
*
* Author: Vladislav Buzov <vbuzov@embeddedalley.com>
*
* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#ifndef __PINMUX_H
#define __PINMUX_H
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/gpio.h>
#include <asm-generic/gpio.h>
/* Pin definitions */
#include "pins.h"
#include <mach/pins.h>
/*
* Each pin may be routed up to four different HW interfaces
* including GPIO
*/
enum pin_fun {
PIN_FUN1 = 0,
PIN_FUN2,
PIN_FUN3,
PIN_GPIO,
};
/*
* Each pin may have different output drive strength in range from
* 4mA to 20mA. The most common case is 4, 8 and 12 mA strengths.
*/
enum pin_strength {
PIN_4MA = 0,
PIN_8MA,
PIN_12MA,
PIN_16MA,
PIN_20MA,
};
/*
* Each pin can be programmed for 1.8V or 3.3V
*/
enum pin_voltage {
PIN_1_8V = 0,
PIN_3_3V,
};
/*
* Structure to define a group of pins and their parameters
*/
struct pin_desc {
unsigned id;
enum pin_fun fun;
enum pin_strength strength;
enum pin_voltage voltage;
unsigned pullup:1;
};
struct pin_group {
struct pin_desc *pins;
int nr_pins;
};
/* Set pin drive strength */
void stmp3xxx_pin_strength(unsigned id, enum pin_strength strength,
const char *label);
/* Set pin voltage */
void stmp3xxx_pin_voltage(unsigned id, enum pin_voltage voltage,
const char *label);
/* Enable pull-up resistor for a pin */
void stmp3xxx_pin_pullup(unsigned id, int enable, const char *label);
/*
* Request a pin ownership, only one module (identified by @label)
* may own a pin.
*/
int stmp3xxx_request_pin(unsigned id, enum pin_fun fun, const char *label);
/* Release pin */
void stmp3xxx_release_pin(unsigned id, const char *label);
void stmp3xxx_set_pin_type(unsigned id, enum pin_fun fun);
/*
* Each bank is associated with a number of registers to control
* pin function, drive strength, voltage and pull-up reigster. The
* number of registers of a given type depends on the number of bits
* describin particular pin.
*/
#define HW_MUXSEL_NUM 2 /* registers per bank */
#define HW_MUXSEL_PIN_LEN 2 /* bits per pin */
#define HW_MUXSEL_PIN_NUM 16 /* pins per register */
#define HW_MUXSEL_PINFUN_MASK 0x3 /* pin function mask */
#define HW_MUXSEL_PINFUN_NUM 4 /* four options for a pin */
#define HW_DRIVE_NUM 4 /* registers per bank */
#define HW_DRIVE_PIN_LEN 4 /* bits per pin */
#define HW_DRIVE_PIN_NUM 8 /* pins per register */
#define HW_DRIVE_PINDRV_MASK 0x3 /* pin strength mask - 2 bits */
#define HW_DRIVE_PINDRV_NUM 5 /* five possible strength values */
#define HW_DRIVE_PINV_MASK 0x4 /* pin voltage mask - 1 bit */
struct stmp3xxx_pinmux_bank {
struct gpio_chip chip;
/* Pins allocation map */
unsigned long pin_map;
/* Pin owner names */
const char *pin_labels[32];
/* Bank registers */
void __iomem *hw_muxsel[HW_MUXSEL_NUM];
void __iomem *hw_drive[HW_DRIVE_NUM];
void __iomem *hw_pull;
void __iomem *pin2irq,
*irqlevel,
*irqpolarity,
*irqen,
*irqstat;
/* HW MUXSEL register function bit values */
u8 functions[HW_MUXSEL_PINFUN_NUM];
/*
* HW DRIVE register strength bit values:
* 0xff - requested strength is not supported for this bank
*/
u8 strengths[HW_DRIVE_PINDRV_NUM];
/* GPIO things */
void __iomem *hw_gpio_in,
*hw_gpio_out,
*hw_gpio_doe;
int irq, virq;
};
int __init stmp3xxx_pinmux_init(int virtual_irq_start);
#endif /* __PINMUX_H */
|
