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|
/*===============================================================*\
| Project: RTEMS support for MPC83xx |
+-----------------------------------------------------------------+
| Copyright (c) 2007 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| The license and distribution terms for this file may be |
| found in the file LICENSE in this distribution or at |
| |
| http://www.rtems.org/license/LICENSE. |
| |
+-----------------------------------------------------------------+
| this file contains the MPC83xx I2C driver |
\*===============================================================*/
#include <stdlib.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <mpc83xx/mpc83xx_i2cdrv.h>
#include <rtems/error.h>
#include <rtems/bspIo.h>
#include <errno.h>
#include <rtems/libi2c.h>
#undef DEBUG
#if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
#define I2CCR_MEN (1 << 7) /* module enable */
#elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
#define I2CCR_MDIS (1 << 7) /* module disable */
#endif
#define I2CCR_MIEN (1 << 6) /* module interrupt enable */
#define I2CCR_MSTA (1 << 5) /* 0->1 generates a start condiiton, 1->0 a stop */
#define I2CCR_MTX (1 << 4) /* 0 = receive mode, 1 = transmit mode */
#define I2CCR_TXAK (1 << 3) /* 0 = send ack 1 = send nak during receive */
#define I2CCR_RSTA (1 << 2) /* 1 = send repeated start condition */
#define I2CCR_BCST (1 << 0) /* 0 = disable 1 = enable broadcast accept */
#define I2CSR_MCF (1 << 7) /* data transfer (0=transfer in progres) */
#define I2CSR_MAAS (1 << 6) /* addessed as slave */
#define I2CSR_MBB (1 << 5) /* bus busy */
#define I2CSR_MAL (1 << 4) /* arbitration lost */
#define I2CSR_BCSTM (1 << 3) /* broadcast match */
#define I2CSR_SRW (1 << 2) /* slave read/write */
#define I2CSR_MIF (1 << 1) /* module interrupt */
#define I2CSR_RXAK (1 << 0) /* receive acknowledge */
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static rtems_status_code mpc83xx_i2c_find_clock_divider
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| determine proper divider value |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
uint8_t *result, /* result value */
int divider /* requested divider */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| o = ok or error code |
\*=========================================================================*/
{
int i;
int fdr_val;
rtems_status_code sc = RTEMS_SUCCESSFUL;
struct {
int divider;
int fdr_val;
} dividers[] ={
#if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
{ 256,0x20 }, { 288,0x21 }, { 320,0x22 }, { 352,0x23 },
{ 384,0x00 }, { 416,0x01 }, { 448,0x25 }, { 480,0x02 },
{ 512,0x26 }, { 576,0x03 }, { 640,0x04 }, { 704,0x05 },
{ 768,0x29 }, { 832,0x06 }, { 896,0x2a }, { 1024,0x07 },
{ 1152,0x08 }, { 1280,0x09 }, { 1536,0x0A }, { 1792,0x2E },
{ 1920,0x0B }, { 2048,0x2F }, { 2304,0x0C }, { 2560,0x0D },
{ 3072,0x0E }, { 3584,0x32 }, { 3840,0x0F }, { 4096,0x33 },
{ 4608,0x10 }, { 5120,0x11 }, { 6144,0x12 }, { 7168,0x36 },
{ 7680,0x13 }, { 8192,0x37 }, { 9216,0x14 }, {10240,0x15 },
{12288,0x16 }, {14336,0x3A }, {15360,0x17 }, {16384,0x3B },
{18432,0x18 }, {20480,0x19 }, {24576,0x1A }, {28672,0x3E },
{30720,0x1B }, {32768,0x3F }, {36864,0x1C }, {40960,0x1D },
{49152,0x1E }, {61440,0x1F }
#elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
{ 768, 0x31 }
#endif
};
if (divider <= 0) {
sc = RTEMS_INVALID_NUMBER;
}
if (sc == RTEMS_SUCCESSFUL) {
sc = RTEMS_INVALID_NUMBER;
for (i = 0, fdr_val = -1; i < sizeof(dividers)/sizeof(dividers[0]); i++) {
fdr_val = dividers[i].fdr_val;
if (dividers[i].divider >= divider)
{
sc = RTEMS_SUCCESSFUL;
*result = fdr_val;
break;
}
}
}
return sc;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static int mpc83xx_i2c_wait
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| wait for i2c to become idle |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
mpc83xx_i2c_softc_t *softc_ptr, /* handle */
uint8_t desired_status, /* desired status word */
uint8_t status_mask /* status word mask */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| o = ok or error code |
\*=========================================================================*/
{
uint8_t act_status;
rtems_status_code rc;
uint32_t tout;
#if defined(DEBUG)
printk("mpc83xx_i2c_wait called... ");
#endif
if (softc_ptr->initialized) {
/*
* enable interrupt mask
*/
softc_ptr->reg_ptr->i2ccr |= I2CCR_MIEN;
rc = rtems_semaphore_obtain(softc_ptr->irq_sema_id,RTEMS_WAIT,100);
if (rc != RTEMS_SUCCESSFUL) {
return rc;
}
}
else {
tout = 0;
do {
if (tout++ > 1000000) {
#if defined(DEBUG)
printk("... exit with RTEMS_TIMEOUT\r\n");
#endif
return RTEMS_TIMEOUT;
}
} while (!(softc_ptr->reg_ptr->i2csr & I2CSR_MIF));
}
softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MIEN;
act_status = softc_ptr->reg_ptr->i2csr;
if ((act_status & status_mask) != desired_status) {
#if defined(DEBUG)
printk("... exit with RTEMS_IO_ERROR\r\n");
#endif
return RTEMS_IO_ERROR;
}
#if defined(DEBUG)
printk("... exit OK\r\n");
#endif
return RTEMS_SUCCESSFUL;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static void mpc83xx_i2c_irq_handler
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| handle interrupts |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_irq_hdl_param handle /* handle, is softc_ptr structure */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| <none> |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = (mpc83xx_i2c_softc_t *)handle;
/*
* clear IRQ flag
*/
#if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
softc_ptr->reg_ptr->i2csr &= ~I2CSR_MIF;
#elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
softc_ptr->reg_ptr->i2csr = I2CSR_MIF;
#endif
/*
* disable interrupt mask
*/
softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MIEN;
if (softc_ptr->initialized) {
rtems_semaphore_release(softc_ptr->irq_sema_id);
}
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static void mpc83xx_i2c_irq_on_off
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| enable/disable interrupts (void, handled at different position) |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
const
rtems_irq_connect_data *irq_conn_data /* irq connect data */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| <none> |
\*=========================================================================*/
{
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static int mpc83xx_i2c_irq_isOn
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| check state of interrupts, void, done differently |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
const
rtems_irq_connect_data *irq_conn_data /* irq connect data */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| TRUE, if enabled |
\*=========================================================================*/
{
return (TRUE);
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static void mpc83xx_i2c_install_irq_handler
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| (un-)install the interrupt handler |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
mpc83xx_i2c_softc_t *softc_ptr, /* ptr to control structure */
int install /* TRUE: install, FALSE: remove */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| <none> |
\*=========================================================================*/
{
rtems_status_code rc = RTEMS_SUCCESSFUL;
rtems_irq_connect_data irq_conn_data = {
softc_ptr->irq_number,
mpc83xx_i2c_irq_handler, /* rtems_irq_hdl */
(rtems_irq_hdl_param)softc_ptr, /* (rtems_irq_hdl_param) */
mpc83xx_i2c_irq_on_off, /* (rtems_irq_enable) */
mpc83xx_i2c_irq_on_off, /* (rtems_irq_disable) */
mpc83xx_i2c_irq_isOn /* (rtems_irq_is_enabled) */
};
/*
* (un-)install handler for I2C device
*/
if (install) {
/*
* create semaphore for IRQ synchronization
*/
rc = rtems_semaphore_create(rtems_build_name('i','2','c','s'),
0,
RTEMS_FIFO
| RTEMS_SIMPLE_BINARY_SEMAPHORE,
0,
&softc_ptr->irq_sema_id);
if (rc != RTEMS_SUCCESSFUL) {
rtems_panic("I2C: cannot create semaphore");
}
if (!BSP_install_rtems_irq_handler (&irq_conn_data)) {
rtems_panic("I2C: cannot install IRQ handler");
}
}
else {
if (!BSP_remove_rtems_irq_handler (&irq_conn_data)) {
rtems_panic("I2C: cannot uninstall IRQ handler");
}
/*
* delete sync semaphore
*/
if (softc_ptr->irq_sema_id != 0) {
rc = rtems_semaphore_delete(softc_ptr->irq_sema_id);
if (rc != RTEMS_SUCCESSFUL) {
rtems_panic("I2C: cannot delete semaphore");
}
}
}
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static rtems_status_code mpc83xx_i2c_init
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| initialize the driver |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_libi2c_bus_t *bh /* bus specifier structure */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| o = ok or error code |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
uint8_t fdr_val;
int errval;
#if defined(DEBUG)
printk("mpc83xx_i2c_init called... ");
#endif
/*
* init HW registers
*/
/*
* init frequency divider to 100kHz
*/
errval = mpc83xx_i2c_find_clock_divider(&fdr_val,
softc_ptr->base_frq/100000);
if (errval != 0) {
return errval;
}
softc_ptr->reg_ptr->i2cfdr = fdr_val;
/*
* init digital filter sampling rate
*/
softc_ptr->reg_ptr->i2cdfsrr = 0x10 ; /* no special filtering needed */
/*
* set own slave address to broadcast (0x00)
*/
softc_ptr->reg_ptr->i2cadr = 0x00 ;
/*
* set control register to module enable
*/
#if defined(LIBBSP_POWERPC_GEN83XX_BSP_H)
softc_ptr->reg_ptr->i2ccr = I2CCR_MEN;
#elif defined(LIBBSP_POWERPC_MPC55XXEVB_BSP_H)
softc_ptr->reg_ptr->i2ccr = 0;
#endif
/*
* init interrupt stuff
*/
mpc83xx_i2c_install_irq_handler(softc_ptr,TRUE);
/*
* mark, that we have initialized
*/
softc_ptr->initialized = TRUE;
#if defined(DEBUG)
printk("... exit OK\r\n");
#endif
return RTEMS_SUCCESSFUL;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static rtems_status_code mpc83xx_i2c_send_start
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| send a start condition to bus |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_libi2c_bus_t *bh /* bus specifier structure */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| o = ok or error code |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
#if defined(DEBUG)
printk("mpc83xx_i2c_send_start called... ");
#endif
if (0 != (softc_ptr->reg_ptr->i2ccr & I2CCR_MSTA)) {
/*
* already started, so send a "repeated start"
*/
softc_ptr->reg_ptr->i2ccr |= I2CCR_RSTA;
}
else {
softc_ptr->reg_ptr->i2ccr |= I2CCR_MSTA;
}
#if defined(DEBUG)
printk("... exit OK\r\n");
#endif
return 0;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static rtems_status_code mpc83xx_i2c_send_stop
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| send a stop condition to bus |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_libi2c_bus_t *bh /* bus specifier structure */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| o = ok or error code |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
#if defined(DEBUG)
printk("mpc83xx_i2c_send_stop called... ");
#endif
softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MSTA;
/*
* wait, 'til stop has been executed
*/
while (0 != (softc_ptr->reg_ptr->i2csr & I2CSR_MBB)) {
rtems_task_wake_after(RTEMS_YIELD_PROCESSOR);
}
#if defined(DEBUG)
printk("... exit OK\r\n");
#endif
return 0;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static rtems_status_code mpc83xx_i2c_send_addr
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| address a slave device on the bus |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_libi2c_bus_t *bh, /* bus specifier structure */
uint32_t addr, /* address to send on bus */
int rw /* 0=write,1=read */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| o = ok or error code |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
uint8_t addr_byte;
rtems_status_code rc;
#if defined(DEBUG)
printk("mpc83xx_i2c_send_addr called... ");
#endif
softc_ptr->reg_ptr->i2ccr |= I2CCR_MTX;
/*
* determine, whether short or long address is needed, determine rd/wr
*/
if (addr > 0x7f) {
addr_byte = (0xf0
| ((addr >> 7) & 0x06)
| ((rw) ? 1 : 0));
/*
* send first byte
*/
softc_ptr->reg_ptr->i2cdr = addr_byte;
/*
* wait for successful transfer
*/
rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | I2CSR_RXAK);
if (rc != RTEMS_SUCCESSFUL) {
#if defined(DEBUG)
printk("... exit rc=%d\r\n",rc);
#endif
return rc;
}
}
/*
* send (final) byte
*/
addr_byte = ((addr << 1)
| ((rw) ? 1 : 0));
softc_ptr->reg_ptr->i2cdr = addr_byte;
/*
* wait for successful transfer
*/
rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | I2CSR_RXAK);
#if defined(DEBUG)
printk("... exit rc=%d\r\n",rc);
#endif
return rc;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static int mpc83xx_i2c_read_bytes
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| receive some bytes from I2C device |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_libi2c_bus_t *bh, /* bus specifier structure */
unsigned char *buf, /* buffer to store bytes */
int len /* number of bytes to receive */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| number of bytes received or (negative) error code |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
rtems_status_code rc;
unsigned char *p = buf;
#if defined(DEBUG)
printk("mpc83xx_i2c_read_bytes called... ");
#endif
softc_ptr->reg_ptr->i2ccr &= ~I2CCR_MTX;
softc_ptr->reg_ptr->i2ccr &= ~I2CCR_TXAK;
/*
* FIXME: do we need to deactivate TXAK from the start,
* when only one byte is to be received?
*/
/*
* we need a dummy transfer here to start the first read
*/
softc_ptr->reg_ptr->i2cdr;
while (len-- > 0) {
if (len == 0) {
/*
* last byte is not acknowledged
*/
softc_ptr->reg_ptr->i2ccr |= I2CCR_TXAK;
}
/*
* wait 'til end of transfer
*/
rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF);
if (rc != RTEMS_SUCCESSFUL) {
#if defined(DEBUG)
printk("... exit rc=%d\r\n",-rc);
#endif
return -rc;
}
*p++ = softc_ptr->reg_ptr->i2cdr;
}
/*
* wait 'til end of last transfer
*/
rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF);
#if defined(DEBUG)
printk("... exit OK, rc=%d\r\n",p-buf);
#endif
return p - buf;
}
/*=========================================================================*\
| Function: |
\*-------------------------------------------------------------------------*/
static int mpc83xx_i2c_write_bytes
(
/*-------------------------------------------------------------------------*\
| Purpose: |
| send some bytes to I2C device |
+---------------------------------------------------------------------------+
| Input Parameters: |
\*-------------------------------------------------------------------------*/
rtems_libi2c_bus_t *bh, /* bus specifier structure */
unsigned char *buf, /* buffer to send */
int len /* number of bytes to send */
)
/*-------------------------------------------------------------------------*\
| Return Value: |
| number of bytes sent or (negative) error code |
\*=========================================================================*/
{
mpc83xx_i2c_softc_t *softc_ptr = &(((mpc83xx_i2c_desc_t *)(bh))->softc);
rtems_status_code rc;
unsigned char *p = buf;
#if defined(DEBUG)
printk("mpc83xx_i2c_write_bytes called... ");
#endif
softc_ptr->reg_ptr->i2ccr =
(softc_ptr->reg_ptr->i2ccr & ~I2CCR_TXAK) | I2CCR_MTX;
while (len-- > 0) {
int rxack = len != 0 ? I2CSR_RXAK : 0;
softc_ptr->reg_ptr->i2cdr = *p++;
/*
* wait 'til end of transfer
*/
rc = mpc83xx_i2c_wait(softc_ptr, I2CSR_MCF, I2CSR_MCF | rxack);
if (rc != RTEMS_SUCCESSFUL) {
#if defined(DEBUG)
printk("... exit rc=%d\r\n",-rc);
#endif
return -rc;
}
}
#if defined(DEBUG)
printk("... exit OK, rc=%d\r\n",p-buf);
#endif
return p - buf;
}
rtems_libi2c_bus_ops_t mpc83xx_i2c_ops = {
.init = mpc83xx_i2c_init,
.send_start = mpc83xx_i2c_send_start,
.send_stop = mpc83xx_i2c_send_stop,
.send_addr = mpc83xx_i2c_send_addr,
.read_bytes = mpc83xx_i2c_read_bytes,
.write_bytes = mpc83xx_i2c_write_bytes,
};
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