projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 65131cd5 RG |
1 | /* |
| 2 | * Silicon Labs C2 port Linux support for Eurotech Duramar 2150 | |
| 3 | * | |
| 4 | * Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it> | |
| 5 | * Copyright (c) 2008 Eurotech S.p.A. <info@eurotech.it> | |
| 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 | ||
| 12 | #include <linux/errno.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/kernel.h> | |
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/delay.h> | |
| 17 | #include <linux/io.h> | |
| ecd9d34a | 18 | #include <linux/ioport.h> |
| 65131cd5 RG |
19 | #include <linux/c2port.h> |
| 20 | ||
| 21 | #define DATA_PORT 0x325 | |
| 22 | #define DIR_PORT 0x326 | |
| 23 | #define C2D (1 << 0) | |
| 24 | #define C2CK (1 << 1) | |
| 25 | ||
| 26 | static DEFINE_MUTEX(update_lock); | |
| 27 | ||
| 28 | /* | |
| 29 | * C2 port operations | |
| 30 | */ | |
| 31 | ||
| 32 | static void duramar2150_c2port_access(struct c2port_device *dev, int status) | |
| 33 | { | |
| 34 | u8 v; | |
| 35 | ||
| 36 | mutex_lock(&update_lock); | |
| 37 | ||
| 38 | v = inb(DIR_PORT); | |
| 39 | ||
| 40 | /* 0 = input, 1 = output */ | |
| 41 | if (status) | |
| 42 | outb(v | (C2D | C2CK), DIR_PORT); | |
| 43 | else | |
| 44 | /* When access is "off" is important that both lines are set | |
| 25985edc | 45 | * as inputs or hi-impedance */ |
| 65131cd5 RG |
46 | outb(v & ~(C2D | C2CK), DIR_PORT); |
| 47 | ||
| 48 | mutex_unlock(&update_lock); | |
| 49 | } | |
| 50 | ||
| 51 | static void duramar2150_c2port_c2d_dir(struct c2port_device *dev, int dir) | |
| 52 | { | |
| 53 | u8 v; | |
| 54 | ||
| 55 | mutex_lock(&update_lock); | |
| 56 | ||
| 57 | v = inb(DIR_PORT); | |
| 58 | ||
| 59 | if (dir) | |
| 60 | outb(v & ~C2D, DIR_PORT); | |
| 61 | else | |
| 62 | outb(v | C2D, DIR_PORT); | |
| 63 | ||
| 64 | mutex_unlock(&update_lock); | |
| 65 | } | |
| 66 | ||
| 67 | static int duramar2150_c2port_c2d_get(struct c2port_device *dev) | |
| 68 | { | |
| 69 | return inb(DATA_PORT) & C2D; | |
| 70 | } | |
| 71 | ||
| 72 | static void duramar2150_c2port_c2d_set(struct c2port_device *dev, int status) | |
| 73 | { | |
| 74 | u8 v; | |
| 75 | ||
| 76 | mutex_lock(&update_lock); | |
| 77 | ||
| 78 | v = inb(DATA_PORT); | |
| 79 | ||
| 80 | if (status) | |
| 81 | outb(v | C2D, DATA_PORT); | |
| 82 | else | |
| 83 | outb(v & ~C2D, DATA_PORT); | |
| 84 | ||
| 85 | mutex_unlock(&update_lock); | |
| 86 | } | |
| 87 | ||
| 88 | static void duramar2150_c2port_c2ck_set(struct c2port_device *dev, int status) | |
| 89 | { | |
| 90 | u8 v; | |
| 91 | ||
| 92 | mutex_lock(&update_lock); | |
| 93 | ||
| 94 | v = inb(DATA_PORT); | |
| 95 | ||
| 96 | if (status) | |
| 97 | outb(v | C2CK, DATA_PORT); | |
| 98 | else | |
| 99 | outb(v & ~C2CK, DATA_PORT); | |
| 100 | ||
| 101 | mutex_unlock(&update_lock); | |
| 102 | } | |
| 103 | ||
| 104 | static struct c2port_ops duramar2150_c2port_ops = { | |
| 105 | .block_size = 512, /* bytes */ | |
| 106 | .blocks_num = 30, /* total flash size: 15360 bytes */ | |
| 107 | ||
| 108 | .access = duramar2150_c2port_access, | |
| 109 | .c2d_dir = duramar2150_c2port_c2d_dir, | |
| 110 | .c2d_get = duramar2150_c2port_c2d_get, | |
| 111 | .c2d_set = duramar2150_c2port_c2d_set, | |
| 112 | .c2ck_set = duramar2150_c2port_c2ck_set, | |
| 113 | }; | |
| 114 | ||
| 115 | static struct c2port_device *duramar2150_c2port_dev; | |
| 116 | ||
| 117 | /* | |
| 118 | * Module stuff | |
| 119 | */ | |
| 120 | ||
| 121 | static int __init duramar2150_c2port_init(void) | |
| 122 | { | |
| 123 | struct resource *res; | |
| 124 | int ret = 0; | |
| 125 | ||
| 126 | res = request_region(0x325, 2, "c2port"); | |
| 127 | if (!res) | |
| 128 | return -EBUSY; | |
| 129 | ||
| 130 | duramar2150_c2port_dev = c2port_device_register("uc", | |
| 131 | &duramar2150_c2port_ops, NULL); | |
| 24060769 DC |
132 | if (IS_ERR(duramar2150_c2port_dev)) { |
| 133 | ret = PTR_ERR(duramar2150_c2port_dev); | |
| 65131cd5 RG |
134 | goto free_region; |
| 135 | } | |
| 136 | ||
| 137 | return 0; | |
| 138 | ||
| 139 | free_region: | |
| 140 | release_region(0x325, 2); | |
| 141 | return ret; | |
| 142 | } | |
| 143 | ||
| 144 | static void __exit duramar2150_c2port_exit(void) | |
| 145 | { | |
| 146 | /* Setup the GPIOs as input by default (access = 0) */ | |
| 147 | duramar2150_c2port_access(duramar2150_c2port_dev, 0); | |
| 148 | ||
| 149 | c2port_device_unregister(duramar2150_c2port_dev); | |
| 150 | ||
| 151 | release_region(0x325, 2); | |
| 152 | } | |
| 153 | ||
| 154 | module_init(duramar2150_c2port_init); | |
| 155 | module_exit(duramar2150_c2port_exit); | |
| 156 | ||
| 157 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); | |
| 158 | MODULE_DESCRIPTION("Silicon Labs C2 port Linux support for Duramar 2150"); | |
| 159 | MODULE_LICENSE("GPL"); |