1 /*
2 * arch/arm/mach-ns9xxx/gpio-ns9360.c
3 *
4 * Copyright (C) 2006,2007 by Digi International Inc.
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11 #include <linux/bug.h>
12 #include <linux/errno.h>
13 #include <linux/io.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16
17 #include <mach/regs-bbu.h>
18 #include <mach/processor-ns9360.h>
19
20 #include "gpio-ns9360.h"
21
22 static inline int ns9360_valid_gpio(unsigned gpio)
23 {
24 return gpio <= 72;
25 }
26
27 static inline void __iomem *ns9360_gpio_get_gconfaddr(unsigned gpio)
28 {
29 if (gpio < 56)
30 return BBU_GCONFb1(gpio / 8);
31 else
32 /*
33 * this could be optimised away on
34 * ns9750 only builds, but it isn't ...
35 */
36 return BBU_GCONFb2((gpio - 56) / 8);
37 }
38
39 static inline void __iomem *ns9360_gpio_get_gctrladdr(unsigned gpio)
40 {
41 if (gpio < 32)
42 return BBU_GCTRL1;
43 else if (gpio < 64)
44 return BBU_GCTRL2;
45 else
46 /* this could be optimised away on ns9750 only builds */
47 return BBU_GCTRL3;
48 }
49
50 static inline void __iomem *ns9360_gpio_get_gstataddr(unsigned gpio)
51 {
52 if (gpio < 32)
53 return BBU_GSTAT1;
54 else if (gpio < 64)
55 return BBU_GSTAT2;
56 else
57 /* this could be optimised away on ns9750 only builds */
58 return BBU_GSTAT3;
59 }
60
61 /*
62 * each gpio can serve for 4 different purposes [0..3]. These are called
63 * "functions" and passed in the parameter func. Functions 0-2 are always some
64 * special things, function 3 is GPIO. If func == 3 dir specifies input or
65 * output, and with inv you can enable an inverter (independent of func).
66 */
67 int __ns9360_gpio_configure(unsigned gpio, int dir, int inv, int func)
68 {
69 void __iomem *conf = ns9360_gpio_get_gconfaddr(gpio);
70 u32 confval;
71
72 confval = __raw_readl(conf);
73 REGSETIM_IDX(confval, BBU_GCONFx, DIR, gpio & 7, dir);
74 REGSETIM_IDX(confval, BBU_GCONFx, INV, gpio & 7, inv);
75 REGSETIM_IDX(confval, BBU_GCONFx, FUNC, gpio & 7, func);
76 __raw_writel(confval, conf);
77
78 return 0;
79 }
80
81 int ns9360_gpio_configure(unsigned gpio, int inv, int func)
82 {
83 if (likely(ns9360_valid_gpio(gpio))) {
84 if (func == 3) {
85 printk(KERN_WARNING "use gpio_direction_input "
86 "or gpio_direction_output\n");
87 return -EINVAL;
88 } else
89 return __ns9360_gpio_configure(gpio, 0, inv, func);
90 } else
91 return -EINVAL;
92 }
93 EXPORT_SYMBOL(ns9360_gpio_configure);
94
95 int ns9360_gpio_get_value(unsigned gpio)
96 {
97 void __iomem *stat = ns9360_gpio_get_gstataddr(gpio);
98 int ret;
99
100 ret = 1 & (__raw_readl(stat) >> (gpio & 31));
101
102 return ret;
103 }
104
105 void ns9360_gpio_set_value(unsigned gpio, int value)
106 {
107 void __iomem *ctrl = ns9360_gpio_get_gctrladdr(gpio);
108 u32 ctrlval;
109
110 ctrlval = __raw_readl(ctrl);
111
112 if (value)
113 ctrlval |= 1 << (gpio & 31);
114 else
115 ctrlval &= ~(1 << (gpio & 31));
116
117 __raw_writel(ctrlval, ctrl);
118 }
119
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