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//
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//
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//    Copyright 2010 TheSeven
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//
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//
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//    This file is part of emCORE.
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//
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//    emCORE is free software: you can redistribute it and/or
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//    modify it under the terms of the GNU General Public License as
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//    published by the Free Software Foundation, either version 2 of the
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//    License, or (at your option) any later version.
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//
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//    emCORE is distributed in the hope that it will be useful,
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//    but WITHOUT ANY WARRANTY; without even the implied warranty of
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//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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//    See the GNU General Public License for more details.
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//
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//    You should have received a copy of the GNU General Public License along
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//    with emCORE.  If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "global.h"
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#include "i2c.h"
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#include "thread.h"
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#include "s5l8702.h"
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#include "clockgates.h"
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static struct mutex i2cmutex;
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static void i2c_on(int bus)
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{
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    /* enable I2C clock */
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    clockgate_enable(CLOCKGATE_I2C(bus), true);
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    IICCON(bus) = (1 << 7) | /* ACK_GEN */
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                  (0 << 6) | /* CLKSEL = PCLK/16 */
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                  (1 << 5) | /* INT_EN */
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                  (1 << 4) | /* IRQ clear */
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                  (7 << 0);  /* CK_REG */
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    /* serial output on */
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    IICSTAT(bus) = (1 << 4);
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}
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static void i2c_off(int bus)
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{
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    /* serial output off */
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    IICSTAT(bus) = 0;
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    /* disable I2C clock */
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    clockgate_enable(CLOCKGATE_I2C(bus), false);
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}
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void i2c_init()
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{
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    mutex_init(&i2cmutex);
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}
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void i2c_send(uint32_t bus, uint32_t device, uint32_t address, const uint8_t* data, uint32_t length)
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{
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    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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	i2c_on(bus);
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    while (IIC10(bus));
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    IICDS(bus) = device & ~1;
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    while (IIC10(bus));
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    IICSTAT(bus) = 0xF0;
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    while (IIC10(bus));
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    IICCON(bus) = 0xB7;
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    while ((IICCON(bus) & 0x10) == 0) yield();
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    if (address >= 0)
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    {
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        /* write address */
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        while (IIC10(bus));
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        IICDS(bus) = address;
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        while (IIC10(bus));
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        IICCON(bus) = 0xB7;
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        while ((IICCON(bus) & 0x10) == 0) yield();
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    }
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    /* write data */
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    while (length--)
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    {
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        while (IIC10(bus));
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        IICDS(bus) = *data++;
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        while (IIC10(bus));
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        IICCON(bus) = 0xB7;
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        while ((IICCON(bus) & 0x10) == 0) yield();
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    }
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    /* STOP */
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    while (IIC10(bus));
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    IICSTAT(bus) = 0xD0;
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    while (IIC10(bus));
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    IICCON(bus) = 0xB7;
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    while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
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	i2c_off(bus);
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    mutex_unlock(&i2cmutex);
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}
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void i2c_recv(uint32_t bus, uint32_t device, uint32_t address, uint8_t* data, uint32_t length)
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{
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    mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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	i2c_on(bus);
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    if (address >= 0)
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    {
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        /* START */
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        while (IIC10(bus));
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        IICDS(bus) = device & ~1;
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        while (IIC10(bus));
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        IICSTAT(bus) = 0xF0;
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        while (IIC10(bus));
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        IICCON(bus) = 0xB7;
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        while ((IICCON(bus) & 0x10) == 0) yield();
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        /* write address */
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        while (IIC10(bus));
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        IICDS(bus) = address;
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        while (IIC10(bus));
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        IICCON(bus) = 0xB7;
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        while ((IICCON(bus) & 0x10) == 0) yield();
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    }
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    /* (repeated) START */
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    while (IIC10(bus));
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    IICDS(bus) = device | 1;
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    while (IIC10(bus));
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    IICSTAT(bus) = 0xB0;
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    while (IIC10(bus));
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    IICCON(bus) = 0xB7;
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    while ((IICCON(bus) & 0x10) == 0) yield();
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    while (length--)
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    {
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        while (IIC10(bus));
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        IICCON(bus) = (length == 0) ? 0x37 : 0xB7; /* NACK or ACK */
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        while ((IICCON(bus) & 0x10) == 0) yield();
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        *data++ = IICDS(bus);
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    }
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    /* STOP */
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    while (IIC10(bus));
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    IICSTAT(bus) = 0x90;
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    while (IIC10(bus));
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    IICCON(bus) = 0xB7;
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    while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
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	i2c_off(bus);
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    mutex_unlock(&i2cmutex);
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}
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void i2c_sendbyte(uint32_t bus, uint32_t device, uint32_t address, uint32_t data)
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{
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    uint8_t buf[1];
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    buf[0] = data;
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    i2c_send(bus, device, address, buf, 1);
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}
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uint8_t i2c_recvbyte(uint32_t bus, uint32_t device, uint32_t address)
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{
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    uint8_t buf[1];
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    i2c_recv(bus, device, address, buf, 1);
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    return buf[0];
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}