void el_execsequence (char const *const *argv1, char const *const *argv2, char const *const *envp)
{
if (!argv2[0])
{
pathexec0_run(argv1, envp) ;
strerr_dieexec(111, argv1[0]) ;
}
else
{
int wstat ;
unsigned int j = 2 ;
#ifdef EXECLINE_OLD_VARNAMES
char fmt[UINT_FMT * 2 + 15] = "?=" ;
#else
char fmt[UINT_FMT + 1] = "?=" ;
#endif
pid_t pid = el_spawn0(argv1[0], argv1, envp) ;
if (!pid) strerr_warnwu2sys("spawn ", argv1[0]) ;
if (wait_pid(pid, &wstat) < 0)
strerr_diefu2sys(111, "wait for ", argv1[0]) ;
j += uint_fmt(fmt + j, wait_status(wstat)) ; fmt[j++] = 0 ;
#ifdef EXECLINE_OLD_VARNAMES
byte_copy(fmt + j, 13, "LASTEXITCODE=") ; j += 13 ;
j += uint_fmt(fmt + j, wait_status(wstat)) ; fmt[j++] = 0 ;
#endif
pathexec_r(argv2, envp, env_len(envp), fmt, j) ;
}
strerr_dieexec(111, argv2[0]) ;
}
/*
* Set the slave address. The controller must be disabled when
* changing the address.
*
* This operation does not issue anything to the I2C bus but sets
* the target address for when the controller later issues a START.
*/
static
void
set_slave_addr(ig4iic_softc_t *sc, uint8_t slave, int trans_op)
{
uint32_t tar;
uint32_t ctl;
int use_10bit;
use_10bit = sc->use_10bit;
if (trans_op & SMB_TRANS_7BIT)
use_10bit = 0;
if (trans_op & SMB_TRANS_10BIT)
use_10bit = 1;
if (sc->slave_valid && sc->last_slave == slave &&
sc->use_10bit == use_10bit) {
return;
}
sc->use_10bit = use_10bit;
/*
* Wait for TXFIFO to drain before disabling the controller.
*
* If a write message has not been completed it's really a
* programming error, but for now in that case issue an extra
* byte + STOP.
*
* If a read message has not been completed it's also a programming
* error, for now just ignore it.
*/
wait_status(sc, IG4_STATUS_TX_NOTFULL);
if (sc->write_started) {
reg_write(sc, IG4_REG_DATA_CMD, IG4_DATA_STOP);
sc->write_started = 0;
}
if (sc->read_started)
sc->read_started = 0;
wait_status(sc, IG4_STATUS_TX_EMPTY);
set_controller(sc, 0);
ctl = reg_read(sc, IG4_REG_CTL);
ctl &= ~IG4_CTL_10BIT;
ctl |= IG4_CTL_RESTARTEN;
tar = slave;
if (sc->use_10bit) {
tar |= IG4_TAR_10BIT;
ctl |= IG4_CTL_10BIT;
}
reg_write(sc, IG4_REG_CTL, ctl);
reg_write(sc, IG4_REG_TAR_ADD, tar);
set_controller(sc, IG4_I2C_ENABLE);
sc->slave_valid = 1;
sc->last_slave = slave;
}
/** run_command(Command* cmd)
** Take a filled-out Command struct and run the command as specified.
*/
void run_command (Command* cmd) {
//Fork
cmd->pid = fork();
if(cmd->pid) {
//Parent - add to background process list or wait
if (cmd->background) {
//Add to running background processes list
add_background(cmd->pid);
} else {
wait_status(cmd->pid, 0);
}
} else {
//Child
//Input redirection (file or dev/null for background)
if (cmd->background && !cmd->redirectIn) {
dup2(open("/dev/null", O_RDONLY), 0);
} else if (cmd->redirectIn) {
dup2(fileno(cmd->redirectIn), STDIN_FILENO);
fclose(cmd->redirectIn);
}
//Output redirection
if (cmd->redirectOut) {
dup2(fileno(cmd->redirectOut), STDOUT_FILENO);
fclose(cmd->redirectOut);
}
//Reset normal signal handling
signal(SIGINT, SIG_DFL);
//Exec the child
exec_child(cmd);
}
}
/* Receiver function */
static int receivedata(const struct spi_slave *slave, u8 *buffer, u32 size)
{
u32 read_data, base;
int ret;
struct img_spi_slave *img_slave = get_img_slave(slave);
base = img_slave->base;
/*
* Do 32bit reads first. Clear status GDEX32BIT here so that the first
* status reg. read gets the actual bit state
*/
write32_x(base + SPFI_INT_CLEAR_REG_OFFSET, SPFI_GDEX32BIT_MASK);
while (size >= sizeof(u32)) {
ret = wait_status(base + SPFI_INT_STATUS_REG_OFFSET,
SPFI_GDEX32BIT_SHIFT);
if (ret)
return ret;
read_data = read32_x(base + SPFI_GET_LONG_REG_OFFSET);
memcpy(buffer, &read_data, sizeof(u32));
buffer += sizeof(u32);
size -= sizeof(u32);
/* Clear interrupt status on GDEX32BITL */
write32_x(base + SPFI_INT_CLEAR_REG_OFFSET, SPFI_GDEX32BIT_MASK);
}
/*
* Do the remaining 8bit reads. Clear status GDEX8BIT here so that
* the first status reg. read gets the actual bit state
*/
write32_x(base + SPFI_INT_CLEAR_REG_OFFSET, SPFI_GDEX8BIT_MASK);
while (size) {
ret = wait_status(base + SPFI_INT_STATUS_REG_OFFSET,
SPFI_GDEX8BIT_SHIFT);
if (ret)
return ret;
*buffer = read32_x(base + SPFI_GET_BYTE_REG_OFFSET);
buffer++;
size--;
/* Clear interrupt status on SPFI_GDEX8BIT */
write32_x(base + SPFI_INT_CLEAR_REG_OFFSET, SPFI_GDEX8BIT_MASK);
}
return SPIM_OK;
}
/** background_handler(int sig)
** Handler for SIGCHLD. Find the newly closed process,
** and remove it to the background process list.
*/
void background_handler(int sig) {
int status;
//Loop over background process list to find the closed process
for (int i = 0; i < numBackground; i++) {
//Use waitpid with nohang to determine if process has closed
if (background[i].running) {
status = wait_status(background[i].pid, WNOHANG);
if (status != 2) {
background[i].running = 0;
}
}
}
}
static int master_start(int port, int slave_addr)
{
int rv;
/* Change to master send mode, reset stop bit, send start bit */
STM32_I2C_CR1(port) = (STM32_I2C_CR1(port) & ~(1 << 9)) | (1 << 8);
/* Wait for start bit sent event */
rv = wait_status(port, SR1_SB, WAIT_MASTER_START);
if (rv)
return rv;
/* Send address */
STM32_I2C_DR(port) = slave_addr;
/* Wait for addr ready */
rv = wait_status(port, SR1_ADDR, WAIT_ADDR_READY);
if (rv)
return rv;
read_clear_status(port);
return EC_SUCCESS;
}
static int
do_umount()
{
pid_t pid;
if((pid = fork()) == -1) {
fprintf(stderr, "fork() failed\n");
exit(EXIT_FAILURE);
}
if(pid == 0) {
exec_umount();
return -1;
}
else {
return wait_status(pid);
}
}
/*
* Incremental receive byte without stop (?). It is unclear why the slave
* address is specified if this presumably is used in combination with
* ig4iic_smb_quick().
*/
int
ig4iic_smb_recvb(device_t dev, u_char slave, char *byte)
{
ig4iic_softc_t *sc = device_get_softc(dev);
int error;
mtx_lock(&sc->mtx);
set_slave_addr(sc, slave, 0);
reg_write(sc, IG4_REG_DATA_CMD, IG4_DATA_COMMAND_RD);
if (wait_status(sc, IG4_STATUS_RX_NOTEMPTY) == 0) {
*byte = data_read(sc);
error = 0;
} else {
*byte = 0;
error = SMB_ETIMEOUT;
}
mtx_unlock(&sc->mtx);
return error;
}
/*
* Incremental send byte without stop (?). It is unclear why the slave
* address is specified if this presumably is used in combination with
* ig4iic_smb_quick().
*
* (Also, how would this work anyway? Issue the last byte with writeb()?)
*/
int
ig4iic_smb_sendb(device_t dev, u_char slave, char byte)
{
ig4iic_softc_t *sc = device_get_softc(dev);
uint32_t cmd;
int error;
mtx_lock(&sc->mtx);
set_slave_addr(sc, slave, 0);
cmd = byte;
if (wait_status(sc, IG4_STATUS_TX_NOTFULL) == 0) {
reg_write(sc, IG4_REG_DATA_CMD, cmd);
error = 0;
} else {
error = SMB_ETIMEOUT;
}
mtx_unlock(&sc->mtx);
return error;
}
/* Transmitter function. Fills TX FIFO with data before enabling SPIM */
static int transmitdata(const struct spi_slave *slave, u8 *buffer, u32 size)
{
u32 blocksize, base, write_data;
int ret;
struct img_spi_slave *img_slave = get_img_slave(slave);
base = img_slave->base;
while (size) {
/* Wait until FIFO empty */
write32_x(base + SPFI_INT_CLEAR_REG_OFFSET, SPFI_SDE_MASK);
ret = wait_status(base + SPFI_INT_STATUS_REG_OFFSET,
SPFI_SDE_SHIFT);
if (ret)
return ret;
/*
* Write to FIFO in blocks of 16 words (64 bytes)
* Do 32bit writes first.
*/
blocksize = SPIM_MAX_BLOCK_BYTES;
while ((size >= sizeof(u32)) && blocksize) {
memcpy(&write_data, buffer, sizeof(u32));
write32_x(base + SPFI_SEND_LONG_REG_OFFSET, write_data);
buffer += sizeof(u32);
size -= sizeof(u32);
blocksize -= sizeof(u32);
}
while (size && blocksize) {
write32_x(base + SPFI_SEND_BYTE_REG_OFFSET, *buffer);
buffer++;
size--;
blocksize--;
}
}
return SPIM_OK;
}
virtual ~plugin_thread() {
change_status(stopping);
wait_status();
}
/** run_pipe_commands (Command* cmd1, Command* cmd2)
** Take two commands and run them, piped together.
*/
void run_pipe_commands (Command* cmd1, Command* cmd2) {
int fds[2];
//Make pipe between commands - 0 is read end, 1 is write end
pipe(fds);
//Fork first command
cmd1->pid = fork();
if(!cmd1->pid) {
//Child
//Do input redirection
if (cmd1->redirectIn) {
dup2(fileno(cmd1->redirectIn), STDIN_FILENO);
fclose(cmd2->redirectIn);
}
//Set stdout to write end of pipe
dup2(fds[1] , 1);
//Close files
close(fds[0]);
close(fds[1]);
//Exec
exec_child(cmd1);
}
//Fork second command
cmd2->pid = fork();
if(!cmd2->pid) {
//Child
//Do output redirection
if (cmd2->redirectOut) {
dup2(fileno(cmd2->redirectOut), STDOUT_FILENO);
fclose(cmd2->redirectOut);
}
//Set stdin to read end of pipe
dup2(fds[0], 0);
close(fds[0]);
close(fds[1]);
//Exec
exec_child(cmd2);
}
//Close files
close(fds[0]);
close(fds[1]);
int status[2];
//Wait on first process - if it fails, terminate the second
if (wait_status(cmd1->pid, 0) == 1) {
//Error occured - terminate
kill(cmd2->pid, SIGINT);
//Not a background command so we need to reap cmd2.
//Don't want to display a message so don't use that command.
waitpid(cmd2->pid, NULL, 0);
}
//Wait on second process
waitpid(cmd2->pid, &status[1], 0);
}
/*
* Issue START with byte command, possible count, and a variable length
* read or write buffer, then possible turn-around read. The read also
* has a possible count received.
*
* For SMBUS -
*
* Quick: START+ADDR+RD/WR STOP
*
* Normal: START+ADDR+WR CMD DATA..DATA STOP
*
* START+ADDR+RD CMD
* RESTART+ADDR RDATA..RDATA STOP
* (can also be used for I2C transactions)
*
* Process Call: START+ADDR+WR CMD DATAL DATAH
* RESTART+ADDR+RD RDATAL RDATAH STOP
*
* Block: START+ADDR+RD CMD
* RESTART+ADDR+RD RCOUNT DATA... STOP
*
* START+ADDR+WR CMD
* RESTART+ADDR+WR WCOUNT DATA... STOP
*
* For I2C - basically, no *COUNT fields, possibly no *CMD field. If the
* sender needs to issue a 2-byte command it will incorporate it
* into the write buffer and also set NOCMD.
*
* Generally speaking, the START+ADDR / RESTART+ADDR is handled automatically
* by the controller at the beginning of a command sequence or on a data
* direction turn-around, and we only need to tell it when to issue the STOP.
*/
static int
smb_transaction(ig4iic_softc_t *sc, char cmd, int op,
char *wbuf, int wcount, char *rbuf, int rcount, int *actualp)
{
int error;
int unit;
uint32_t last;
/*
* Debugging - dump registers
*/
if (ig4_dump) {
unit = device_get_unit(sc->dev);
if (ig4_dump & (1 << unit)) {
ig4_dump &= ~(1 << unit);
ig4iic_dump(sc);
}
}
/*
* Issue START or RESTART with next data byte, clear any previous
* abort condition that may have been holding the txfifo in reset.
*/
last = IG4_DATA_RESTART;
reg_read(sc, IG4_REG_CLR_TX_ABORT);
if (actualp)
*actualp = 0;
/*
* Issue command if not told otherwise (smbus).
*/
if ((op & SMB_TRANS_NOCMD) == 0) {
error = wait_status(sc, IG4_STATUS_TX_NOTFULL);
if (error)
goto done;
last |= (u_char)cmd;
if (wcount == 0 && rcount == 0 && (op & SMB_TRANS_NOSTOP) == 0)
last |= IG4_DATA_STOP;
reg_write(sc, IG4_REG_DATA_CMD, last);
last = 0;
}
/*
* Clean out any previously received data.
*/
if (sc->rpos != sc->rnext &&
(op & SMB_TRANS_NOREPORT) == 0) {
device_printf(sc->dev,
"discarding %d bytes of spurious data\n",
sc->rnext - sc->rpos);
}
sc->rpos = 0;
sc->rnext = 0;
/*
* If writing and not told otherwise, issue the write count (smbus).
*/
if (wcount && (op & SMB_TRANS_NOCNT) == 0) {
error = wait_status(sc, IG4_STATUS_TX_NOTFULL);
if (error)
goto done;
last |= (u_char)cmd;
reg_write(sc, IG4_REG_DATA_CMD, last);
last = 0;
}
/*
* Bulk write (i2c)
*/
while (wcount) {
error = wait_status(sc, IG4_STATUS_TX_NOTFULL);
if (error)
goto done;
last |= (u_char)*wbuf;
if (wcount == 1 && rcount == 0 && (op & SMB_TRANS_NOSTOP) == 0)
last |= IG4_DATA_STOP;
reg_write(sc, IG4_REG_DATA_CMD, last);
--wcount;
++wbuf;
last = 0;
}
/*
* Issue reads to xmit FIFO (strange, I know) to tell the controller
* to clock in data. At the moment just issue one read ahead to
* pipeline the incoming data.
*
* NOTE: In the case of NOCMD and wcount == 0 we still issue a
* RESTART here, even if the data direction has not changed
* from the previous CHAINing call. This we force the RESTART.
* (A new START is issued automatically by the controller in
* the other nominal cases such as a data direction change or
* a previous STOP was issued).
*
* If this will be the last byte read we must also issue the STOP
* at the end of the read.
*/
if (rcount) {
last = IG4_DATA_RESTART | IG4_DATA_COMMAND_RD;
if (rcount == 1 &&
(op & (SMB_TRANS_NOSTOP | SMB_TRANS_NOCNT)) ==
SMB_TRANS_NOCNT) {
last |= IG4_DATA_STOP;
}
reg_write(sc, IG4_REG_DATA_CMD, last);
last = IG4_DATA_COMMAND_RD;
}
/*
* Bulk read (i2c) and count field handling (smbus)
*/
while (rcount) {
/*
* Maintain a pipeline by queueing the allowance for the next
* read before waiting for the current read.
*/
if (rcount > 1) {
if (op & SMB_TRANS_NOCNT)
last = (rcount == 2) ? IG4_DATA_STOP : 0;
else
last = 0;
reg_write(sc, IG4_REG_DATA_CMD, IG4_DATA_COMMAND_RD |
last);
}
error = wait_status(sc, IG4_STATUS_RX_NOTEMPTY);
if (error) {
if ((op & SMB_TRANS_NOREPORT) == 0) {
device_printf(sc->dev,
"rx timeout addr 0x%02x\n",
sc->last_slave);
}
goto done;
}
last = data_read(sc);
if (op & SMB_TRANS_NOCNT) {
*rbuf = (u_char)last;
++rbuf;
--rcount;
if (actualp)
++*actualp;
} else {
/*
* Handle count field (smbus), which is not part of
* the rcount'ed buffer. The first read data in a
* bulk transfer is the count.
*
* XXX if rcount is loaded as 0 how do I generate a
* STOP now without issuing another RD or WR?
*/
if (rcount > (u_char)last)
rcount = (u_char)last;
op |= SMB_TRANS_NOCNT;
}
}
error = 0;
done:
/* XXX wait for xmit buffer to become empty */
last = reg_read(sc, IG4_REG_TX_ABRT_SOURCE);
return (error);
}
/* Function that carries out read/write operations */
static int spim_io(const struct spi_slave *slave, struct spim_buffer *first,
struct spim_buffer *second)
{
u32 reg, base;
int i, trans_count, ret;
struct spim_buffer *transaction[2];
struct img_spi_slave *img_slave = get_img_slave(slave);
base = img_slave->base;
ret = check_buffers(slave, first, second);
if (ret)
return ret;
/*
* Soft reset peripheral internals, this will terminate any
* pending transactions
*/
write32_x(base + SPFI_CONTROL_REG_OFFSET, SPIM_SOFT_RESET_MASK);
write32_x(base + SPFI_CONTROL_REG_OFFSET, 0);
/* Port state register */
reg = read32_x(base + SPFI_PORT_STATE_REG_OFFSET);
reg = spi_write_reg_field(reg, SPFI_PORT_SELECT, slave->cs);
write32_x(base + SPFI_PORT_STATE_REG_OFFSET, reg);
/* Set transaction register */
reg = transaction_reg_setup(first, second);
write32_x(base + SPFI_TRANSACTION_REG_OFFSET, reg);
/* Clear status */
write32_x(base + SPFI_INT_CLEAR_REG_OFFSET, 0xffffffff);
/* Set control register */
reg = control_reg_setup(first, second);
write32_x(base + SPFI_CONTROL_REG_OFFSET, reg);
/* First transaction always exists */
transaction[0] = first;
trans_count = 1;
/* Is there a second transaction? */
if (second) {
transaction[1] = second;
trans_count++;
}
/* Now write/read FIFO's */
for (i = 0; i < trans_count; i++)
/* Which transaction to execute, "Send" or "Get"? */
if (transaction[i]->isread) {
/* Get */
ret = receivedata(slave, transaction[i]->buffer,
transaction[i]->size);
if (ret) {
printk(BIOS_ERR,
"%s: Error: receive data failed.\n",
__func__);
return ret;
}
} else {
/* Send */
ret = transmitdata(slave, transaction[i]->buffer,
transaction[i]->size);
if (ret) {
printk(BIOS_ERR,
"%s: Error: transmit data failed.\n",
__func__);
return ret;
}
}
/* Wait for end of the transaction */
ret = wait_status(base + SPFI_INT_STATUS_REG_OFFSET,
SPFI_ALLDONE_SHIFT);
if (ret)
return ret;
/*
* Soft reset peripheral internals, this will terminate any
* pending transactions
*/
write32_x(base + SPFI_CONTROL_REG_OFFSET, SPIM_SOFT_RESET_MASK);
write32_x(base + SPFI_CONTROL_REG_OFFSET, 0);
return SPIM_OK;
}