diff options
| -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 target/arm/i2c-telechips.c #elif CONFIG_I2C == I2C_S3C2440 /* no i2c driver yet */ +#elif CONFIG_I2C == I2C_S5L8700 +target/arm/s5l8700/i2c-s5l8700.c #endif #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 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2009 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. + * + ****************************************************************************/ + +#ifndef _I2C_S5l8700_H +#define _I2C_S5l8700_H + +#include "config.h" + +void i2c_init(void); +int i2c_write(unsigned char slave, int address, int len, const unsigned char *data); +int i2c_read(unsigned char slave, int address, int len, unsigned char *data); + +#endif /* _I2C_S5l8700_H */ + 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 @@ +/*************************************************************************** + * __________ __ ___. + * Open \______ \ ____ ____ | | _\_ |__ _______ ___ + * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / + * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < + * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ + * \/ \/ \/ \/ \/ + * $Id$ + * + * Copyright (C) 2009 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. + * + ****************************************************************************/ + +#include "config.h" +#include "system.h" +#include "kernel.h" +#include "i2c-s5l8700.h" + +/* Driver for the s5l8700 built-in I2C controller in master mode + + Both the i2c_read and i2c_write function take the following arguments: + * slave, the address of the i2c slave device to read from / write to + * address, optional sub-address in the i2c slave (unused if -1) + * len, number of bytes to be transfered + * data, pointer to data to be transfered + A return value < 0 indicates an error. + + Known issues: + * uses polled mode (not interrupt driven), just like the OF + * ACK from slave is not checked, so functions never return an error +*/ + +static struct mutex i2c_mtx; + +void i2c_init(void) +{ + mutex_init(&i2c_mtx); + + /* enable I2C pins */ + PCON10 = (2 << 2) | + (2 << 0); + + /* enable I2C clock */ + PWRCON &= ~(1 << 5); + + /* initial config */ + IICADD = 0; + IICCON = (1 << 7) | /* ACK_GEN */ + (1 << 6) | /* CLKSEL = PCLK/512 */ + (1 << 5) | /* INT_EN */ + (1 << 4) | /* IRQ clear */ + (3 << 0); /* CK_REG */ + + /* serial output on */ + IICSTAT = (1 << 4); +} + +int i2c_write(unsigned char slave, int address, int len, const unsigned char *data) +{ + mutex_lock(&i2c_mtx); + + /* START */ + IICDS = slave & ~1; + IICSTAT = 0xF0; + IICCON = 0xF3; + while ((IICCON & (1 << 4)) == 0); + + if (address >= 0) { + /* write address */ + IICDS = address; + IICCON = 0xF3; + while ((IICCON & (1 << 4)) == 0); + } + + /* write data */ + while (len--) { + IICDS = *data++; + IICCON = 0xF3; + while ((IICCON & (1 << 4)) == 0); + } + + /* STOP */ + IICSTAT = 0xD0; + IICCON = 0xF3; + while ((IICSTAT & (1 << 5)) != 0); + + mutex_unlock(&i2c_mtx); + return 0; +} + +int i2c_read(unsigned char slave, int address, int len, unsigned char *data) +{ + mutex_lock(&i2c_mtx); + + if (address >= 0) { + /* START */ + IICDS = slave & ~1; + IICSTAT = 0xF0; + IICCON = 0xF3; + while ((IICCON & (1 << 4)) == 0); + + /* write address */ + IICDS = address; + IICCON = 0xF3; + while ((IICCON & (1 << 4)) == 0); + } + + /* (repeated) START */ + IICDS = slave | 1; + IICSTAT = 0xB0; + IICCON = 0xF3; + while ((IICCON & (1 << 4)) == 0); + + while (len--) { + IICCON = (len == 0) ? 0x73 : 0xF3; /* NACK or ACK */ + while ((IICCON & (1 << 4)) == 0); + *data++ = IICDS; + } + + /* STOP */ + IICSTAT = 0x90; + IICCON = 0xF3; + while ((IICSTAT & (1 << 5)) != 0); + + mutex_unlock(&i2c_mtx); + return 0; +} + |