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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
* Physical interface of the SI4700 in the Gigabeat S
*
* Copyright (C) 2008 by Nils Wallménius
*
* 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.
*
****************************************************************************/
#include "config.h"
#include "system.h"
#include "mc13783.h"
#include "i2c-imx31.h"
#include "fmradio_i2c.h"
static struct i2c_node si4700_i2c_node =
{
.num = I2C2_NUM,
.ifdr = I2C_IFDR_DIV192, /* 66MHz/.4MHz = 165, closest = 192 = 343750Hz */
/* Just hard-code for now - scaling may require
* updating */
.addr = (0x20),
};
void fmradio_i2c_init(void)
{
/* RST: LOW */
imx31_regclr32(&GPIO1_DR, (1 << 26));
/* RST: OUT */
imx31_regset32(&GPIO1_GDIR, (1 << 26));
/* I2C2 SCL: IN, I2C2: SDA IN */
imx31_regclr32(&GPIO2_GDIR, (3 << 14));
/* I2C2 SCL LO, I2C2 SDA LO */
imx31_regclr32(&GPIO2_DR, (3 << 14));
/* open-drain pins - external pullups on PCB. Pullup default but
* disabled */
imx31_regmod32(&SW_PAD_CTL_DSR_DTE1_RI_DTE1_DCD_DTE1,
/* RI_DTE1 (I2C2_SCLK) */
SW_PAD_CTL_IO2w(SW_PAD_CTL_PUE_PKE_DISABLE |
SW_PAD_CTL_PUS_UP_100K |
SW_PAD_CTL_HYS |
SW_PAD_CTL_ODE) |
/* DCD_DTE1 (I2C2_SDA) */
SW_PAD_CTL_IO1w(SW_PAD_CTL_PUE_PKE_DISABLE |
SW_PAD_CTL_PUS_UP_100K |
SW_PAD_CTL_HYS |
SW_PAD_CTL_ODE),
SW_PAD_CTL_IO2 | SW_PAD_CTL_IO1);
/* set outputs to I2C2 */
imx31_regmod32(&SW_MUX_CTL_RI_DTE1_DCD_DTE1_DTR_DCE2_RXD2,
/* RI_DTE1 => I2C2_SCLK */
SW_MUX_CTL_SIG4w(SW_MUX_OUT_ALT2 | SW_MUX_IN_ALT2) |
/* DCD_DTE1 => I2C2_SDA */
SW_MUX_CTL_SIG3w(SW_MUX_OUT_ALT2 | SW_MUX_IN_ALT2),
SW_MUX_CTL_SIG4 | SW_MUX_CTL_SIG3);
}
void fmradio_i2c_enable(bool enable)
{
if (enable)
{
uint32_t io_pin_mux = SW_MUX_CTL_RI_DTE1_DCD_DTE1_DTR_DCE2_RXD2;
/* place in GPIO mode to hold SDIO low during RESET release,
* SEN1 should be high already (pullup) and GPIO3 left alone */
imx31_regset32(&GPIO2_GDIR, (1 << 15)); /* SDIO OUT */
/* I2C2_SDA => MCU2_15 */
imx31_regmod32(&SW_MUX_CTL_RI_DTE1_DCD_DTE1_DTR_DCE2_RXD2,
SW_MUX_CTL_SIG3w(SW_MUX_OUT_GPIO_DR | SW_MUX_IN_GPIO_PSR_ISR),
SW_MUX_CTL_SIG3);
/* enable CLK32KMCU clock */
mc13783_set(MC13783_POWER_CONTROL0, MC13783_CLK32KMCUEN);
/* enable the fm chip (release RESET) */
imx31_regset32(&GPIO1_DR, (1 << 26));
sleep(HZ/100);
/* busmode should be selected - OK to release SDIO */
imx31_regclr32(&GPIO2_GDIR, (1 << 15)); /* SDIO IN */
/* restore pin mux (DCD_DTE1 => I2C2_SDA) */
imx31_regmod32(&SW_MUX_CTL_RI_DTE1_DCD_DTE1_DTR_DCE2_RXD2,
io_pin_mux, SW_MUX_CTL_SIG3);
/* the si4700 is the only thing connected to i2c2 so
we can diable the i2c module when not in use */
i2c_enable_node(&si4700_i2c_node, true);
}
else
{
/* the si4700 is the only thing connected to i2c2 so
we can diable the i2c module when not in use */
i2c_enable_node(&si4700_i2c_node, false);
/* disable the fm chip */
imx31_regclr32(&GPIO1_DR, (1 << 26));
/* disable CLK32KMCU clock */
mc13783_clear(MC13783_POWER_CONTROL0, MC13783_CLK32KMCUEN);
}
}
int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
{
(void)address;
i2c_write(&si4700_i2c_node, buf, count);
return 0;
}
int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
{
(void)address;
i2c_read(&si4700_i2c_node, -1, buf, count);
return 0;
}
int si4700_st(void)
{
return (GPIO1_DR & (1 << 28)) >> 28;
}
|
