diff options
Diffstat (limited to 'firmware')
-rw-r--r-- | firmware/SOURCES | 2 | ||||
-rw-r--r-- | firmware/export/i2c-s5l8700.h | 32 | ||||
-rw-r--r-- | firmware/target/arm/s5l8700/i2c-s5l8700.c | 136 |
3 files changed, 170 insertions, 0 deletions
diff --git a/firmware/SOURCES b/firmware/SOURCES index 6f23012b61..fb192cd7ae 100644 --- a/firmware/SOURCES +++ b/firmware/SOURCES | |||
@@ -358,6 +358,8 @@ target/arm/pnx0101/i2c-pnx0101.c | |||
358 | target/arm/i2c-telechips.c | 358 | target/arm/i2c-telechips.c |
359 | #elif CONFIG_I2C == I2C_S3C2440 | 359 | #elif CONFIG_I2C == I2C_S3C2440 |
360 | /* no i2c driver yet */ | 360 | /* no i2c driver yet */ |
361 | #elif CONFIG_I2C == I2C_S5L8700 | ||
362 | target/arm/s5l8700/i2c-s5l8700.c | ||
361 | #endif | 363 | #endif |
362 | 364 | ||
363 | #if CONFIG_CPU == PNX0101 | 365 | #if CONFIG_CPU == PNX0101 |
diff --git a/firmware/export/i2c-s5l8700.h b/firmware/export/i2c-s5l8700.h new file mode 100644 index 0000000000..e6ffcfae55 --- /dev/null +++ b/firmware/export/i2c-s5l8700.h | |||
@@ -0,0 +1,32 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2009 by Bertrik Sikken | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #ifndef _I2C_S5l8700_H | ||
23 | #define _I2C_S5l8700_H | ||
24 | |||
25 | #include "config.h" | ||
26 | |||
27 | void i2c_init(void); | ||
28 | int i2c_write(unsigned char slave, int address, int len, const unsigned char *data); | ||
29 | int i2c_read(unsigned char slave, int address, int len, unsigned char *data); | ||
30 | |||
31 | #endif /* _I2C_S5l8700_H */ | ||
32 | |||
diff --git a/firmware/target/arm/s5l8700/i2c-s5l8700.c b/firmware/target/arm/s5l8700/i2c-s5l8700.c new file mode 100644 index 0000000000..564bfdd4bd --- /dev/null +++ b/firmware/target/arm/s5l8700/i2c-s5l8700.c | |||
@@ -0,0 +1,136 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2009 by Bertrik Sikken | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "config.h" | ||
23 | #include "system.h" | ||
24 | #include "kernel.h" | ||
25 | #include "i2c-s5l8700.h" | ||
26 | |||
27 | /* Driver for the s5l8700 built-in I2C controller in master mode | ||
28 | |||
29 | Both the i2c_read and i2c_write function take the following arguments: | ||
30 | * slave, the address of the i2c slave device to read from / write to | ||
31 | * address, optional sub-address in the i2c slave (unused if -1) | ||
32 | * len, number of bytes to be transfered | ||
33 | * data, pointer to data to be transfered | ||
34 | A return value < 0 indicates an error. | ||
35 | |||
36 | Known issues: | ||
37 | * uses polled mode (not interrupt driven), just like the OF | ||
38 | * ACK from slave is not checked, so functions never return an error | ||
39 | */ | ||
40 | |||
41 | static struct mutex i2c_mtx; | ||
42 | |||
43 | void i2c_init(void) | ||
44 | { | ||
45 | mutex_init(&i2c_mtx); | ||
46 | |||
47 | /* enable I2C pins */ | ||
48 | PCON10 = (2 << 2) | | ||
49 | (2 << 0); | ||
50 | |||
51 | /* enable I2C clock */ | ||
52 | PWRCON &= ~(1 << 5); | ||
53 | |||
54 | /* initial config */ | ||
55 | IICADD = 0; | ||
56 | IICCON = (1 << 7) | /* ACK_GEN */ | ||
57 | (1 << 6) | /* CLKSEL = PCLK/512 */ | ||
58 | (1 << 5) | /* INT_EN */ | ||
59 | (1 << 4) | /* IRQ clear */ | ||
60 | (3 << 0); /* CK_REG */ | ||
61 | |||
62 | /* serial output on */ | ||
63 | IICSTAT = (1 << 4); | ||
64 | } | ||
65 | |||
66 | int i2c_write(unsigned char slave, int address, int len, const unsigned char *data) | ||
67 | { | ||
68 | mutex_lock(&i2c_mtx); | ||
69 | |||
70 | /* START */ | ||
71 | IICDS = slave & ~1; | ||
72 | IICSTAT = 0xF0; | ||
73 | IICCON = 0xF3; | ||
74 | while ((IICCON & (1 << 4)) == 0); | ||
75 | |||
76 | if (address >= 0) { | ||
77 | /* write address */ | ||
78 | IICDS = address; | ||
79 | IICCON = 0xF3; | ||
80 | while ((IICCON & (1 << 4)) == 0); | ||
81 | } | ||
82 | |||
83 | /* write data */ | ||
84 | while (len--) { | ||
85 | IICDS = *data++; | ||
86 | IICCON = 0xF3; | ||
87 | while ((IICCON & (1 << 4)) == 0); | ||
88 | } | ||
89 | |||
90 | /* STOP */ | ||
91 | IICSTAT = 0xD0; | ||
92 | IICCON = 0xF3; | ||
93 | while ((IICSTAT & (1 << 5)) != 0); | ||
94 | |||
95 | mutex_unlock(&i2c_mtx); | ||
96 | return 0; | ||
97 | } | ||
98 | |||
99 | int i2c_read(unsigned char slave, int address, int len, unsigned char *data) | ||
100 | { | ||
101 | mutex_lock(&i2c_mtx); | ||
102 | |||
103 | if (address >= 0) { | ||
104 | /* START */ | ||
105 | IICDS = slave & ~1; | ||
106 | IICSTAT = 0xF0; | ||
107 | IICCON = 0xF3; | ||
108 | while ((IICCON & (1 << 4)) == 0); | ||
109 | |||
110 | /* write address */ | ||
111 | IICDS = address; | ||
112 | IICCON = 0xF3; | ||
113 | while ((IICCON & (1 << 4)) == 0); | ||
114 | } | ||
115 | |||
116 | /* (repeated) START */ | ||
117 | IICDS = slave | 1; | ||
118 | IICSTAT = 0xB0; | ||
119 | IICCON = 0xF3; | ||
120 | while ((IICCON & (1 << 4)) == 0); | ||
121 | |||
122 | while (len--) { | ||
123 | IICCON = (len == 0) ? 0x73 : 0xF3; /* NACK or ACK */ | ||
124 | while ((IICCON & (1 << 4)) == 0); | ||
125 | *data++ = IICDS; | ||
126 | } | ||
127 | |||
128 | /* STOP */ | ||
129 | IICSTAT = 0x90; | ||
130 | IICCON = 0xF3; | ||
131 | while ((IICSTAT & (1 << 5)) != 0); | ||
132 | |||
133 | mutex_unlock(&i2c_mtx); | ||
134 | return 0; | ||
135 | } | ||
136 | |||