summaryrefslogtreecommitdiffstats
path: root/firmware/target/arm/as3525/fmradio-i2c-as3525.c
blob: ebe7ebeffd258a3cb2664c50824049de9642a655 (plain)
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2008 by Bertrik Sikken
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

/*
    This is the fmradio_i2c interface, used by the radio driver
    to communicate with the radio tuner chip.

    It is implemented using the generic i2c driver, which does "bit-banged"
    I2C with a couple of GPIO pins.
 */

#include "config.h"
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "tuner.h"
#include "generic_i2c.h"
#include "fmradio_i2c.h"
#include "thread.h"
#include "rds.h"

#if     defined(SANSA_CLIP) || defined(SANSA_C200V2)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
#define I2C_SDA_GPIO(x) GPIOB_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOB_DIR
#define I2C_SDA_GPIO_DIR GPIOB_DIR
#define I2C_SCL_PIN 4
#define I2C_SDA_PIN 5

#elif   defined(SANSA_CLIPV2) || defined(SANSA_CLIPPLUS) \
     || defined(SANSA_CLIPZIP)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
#define I2C_SDA_GPIO(x) GPIOB_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOB_DIR
#define I2C_SDA_GPIO_DIR GPIOB_DIR
#define I2C_SCL_PIN 6
#define I2C_SDA_PIN 7

#elif   defined(SANSA_M200V4)
#define I2C_SCL_GPIO(x) GPIOD_PIN(x)
#define I2C_SDA_GPIO(x) GPIOD_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOD_DIR
#define I2C_SDA_GPIO_DIR GPIOD_DIR
#define I2C_SCL_PIN 7
#define I2C_SDA_PIN 6

#elif   defined(SANSA_FUZE) || defined(SANSA_E200V2)
#define I2C_SCL_GPIO(x) GPIOA_PIN(x)
#define I2C_SDA_GPIO(x) GPIOA_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOA_DIR
#define I2C_SDA_GPIO_DIR GPIOA_DIR
#define I2C_SCL_PIN 6
#define I2C_SDA_PIN 7

#elif   defined(SANSA_FUZEV2)
#define I2C_SCL_GPIO(x) GPIOB_PIN(x)
#define I2C_SDA_GPIO(x) GPIOA_PIN(x)
#define I2C_SCL_GPIO_DIR GPIOB_DIR
#define I2C_SDA_GPIO_DIR GPIOA_DIR
#define I2C_SCL_PIN 1
#define I2C_SDA_PIN 0

#else
#error no FM I2C GPIOPIN defines
#endif

static int fm_i2c_bus;

static void fm_scl_dir(bool out)
{
    if (out) {
        I2C_SCL_GPIO_DIR |= 1 << I2C_SCL_PIN;
    } else {
        I2C_SCL_GPIO_DIR &= ~(1 << I2C_SCL_PIN);
    }
}

static void fm_sda_dir(bool out)
{
    if (out) {
        I2C_SDA_GPIO_DIR |= 1 << I2C_SDA_PIN;
    } else {
        I2C_SDA_GPIO_DIR &= ~(1 << I2C_SDA_PIN);
    }
}

static void fm_scl_out(bool level)
{
    if (level) {
        I2C_SCL_GPIO(I2C_SCL_PIN) = 1 << I2C_SCL_PIN;
    } else {
        I2C_SCL_GPIO(I2C_SCL_PIN) = 0;
    }
}

static void fm_sda_out(bool level)
{
    if (level) {
        I2C_SDA_GPIO(I2C_SDA_PIN) = 1 << I2C_SDA_PIN;
    } else {
        I2C_SDA_GPIO(I2C_SDA_PIN) = 0;
    }
}

static bool fm_scl_in(void)
{
    return I2C_SCL_GPIO(I2C_SCL_PIN);
}

static bool fm_sda_in(void)
{
    return I2C_SDA_GPIO(I2C_SDA_PIN);
}

static void fm_delay(int delay)
{
    if (delay != 0) {
        udelay(delay);
    }
}

/* interface towards the generic i2c driver */
static const struct i2c_interface fm_i2c_interface = {
    .scl_out = fm_scl_out,
    .scl_dir = fm_scl_dir,
    .sda_out = fm_sda_out,
    .sda_dir = fm_sda_dir,
    .sda_in = fm_sda_in,
    .scl_in = fm_scl_in,
    .delay = fm_delay,

    .delay_hd_sta = 1,
    .delay_hd_dat = 0,
    .delay_su_dat = 1,
    .delay_su_sto = 1,
    .delay_su_sta = 1,
    .delay_thigh = 2
};

/* initialise i2c for fmradio */
void fmradio_i2c_init(void)
{
    fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
}

int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
#ifdef SANSA_FUZEV2
    bitclr32(&CCU_IO, 1<<12);
#endif
    int ret = i2c_write_data(fm_i2c_bus, address, -1, buf, count);
#ifdef SANSA_FUZEV2
    bitset32(&CCU_IO, 1<<12);
#endif
    return ret;
}

int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
#ifdef SANSA_FUZEV2
    bitclr32(&CCU_IO, 1<<12);
#endif
    int ret = i2c_read_data(fm_i2c_bus, address, -1, buf, count);
#ifdef SANSA_FUZEV2
    bitset32(&CCU_IO, 1<<12);
#endif
    return ret;
}

#ifdef HAVE_RDS_CAP
/* Low-level RDS Support */
static struct semaphore rds_sema;
static uint32_t rds_stack[DEFAULT_STACK_SIZE/sizeof(uint32_t)];

/* RDS GPIO interrupt handler */
void tuner_isr(void)
{
    /* read and clear the interrupt */
    if (GPIOA_MIS & (1<<4)) {
        semaphore_release(&rds_sema);
        GPIOA_IC = (1<<4);
    }
}

/* Captures RDS data and processes it */
static void NORETURN_ATTR rds_thread(void)
{
    uint16_t rds_data[4];

    while (true) {
        semaphore_wait(&rds_sema, TIMEOUT_BLOCK);
        if (si4700_rds_read_raw(rds_data) && rds_process(rds_data)) {
            si4700_rds_set_event();
        }
    }
}

/* Called with on=true after full radio power up, and with on=false before
   powering down */
void si4700_rds_powerup(bool on)
{
    GPIOA_IE &= ~(1<<4);    /* disable GPIO interrupt */

    if (on) {
        GPIOA_DIR &= ~(1<<4);   /* input */
        GPIOA_IS &= ~(1<<4);    /* edge detect */
        GPIOA_IBE &= ~(1<<4);   /* only one edge */
        GPIOA_IEV &= ~(1<<4);   /* falling edge */
        GPIOA_IC = (1<<4);      /* clear any pending interrupt */
        GPIOA_IE |= (1<<4);     /* enable GPIO interrupt */
    }
}

/* One-time RDS init at startup */
void si4700_rds_init(void)
{
    semaphore_init(&rds_sema, 1, 0);
    rds_init();
    create_thread(rds_thread, rds_stack, sizeof(rds_stack), 0, "rds"
                  IF_PRIO(, PRIORITY_REALTIME) IF_COP(, CPU));
}
#endif /* HAVE_RDS_CAP */