static int stu300_await_event(struct stu300_dev *dev,
enum stu300_event mr_event)
{
int ret;
if (unlikely(irqs_disabled())) {
dev_err(&dev->pdev->dev, "irqs are disabled on this "
"system!\n");
return -EIO;
}
spin_lock_irq(&dev->cmd_issue_lock);
dev->cmd_err = STU300_ERROR_NONE;
dev->cmd_event = mr_event;
init_completion(&dev->cmd_complete);
stu300_irq_enable(dev);
spin_unlock_irq(&dev->cmd_issue_lock);
ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
STU300_TIMEOUT);
if (ret < 0) {
dev_err(&dev->pdev->dev,
"wait_for_completion_interruptible_timeout()"
"returned %d waiting for event %04x\n", ret, mr_event);
return ret;
}
if (ret == 0) {
if (mr_event != STU300_EVENT_6) {
dev_err(&dev->pdev->dev, "controller "
"timed out waiting for event %d, reinit "
"hardware\n", mr_event);
(void) stu300_init_hw(dev);
}
return -ETIMEDOUT;
}
if (dev->cmd_err != STU300_ERROR_NONE) {
if (mr_event != STU300_EVENT_6) {
dev_err(&dev->pdev->dev, "controller "
"error (await_event) %d waiting for event %d, "
"reinit hardware\n", dev->cmd_err, mr_event);
(void) stu300_init_hw(dev);
}
return -EIO;
}
return 0;
}
static int stu300_await_event(struct stu300_dev *dev,
enum stu300_event mr_event)
{
int ret;
if (unlikely(irqs_disabled())) {
/* TODO: implement polling for this case if need be. */
dev_err(&dev->pdev->dev, "irqs are disabled on this "
"system!\n");
return -EIO;
}
/* Is it already here? */
spin_lock_irq(&dev->cmd_issue_lock);
dev->cmd_err = STU300_ERROR_NONE;
dev->cmd_event = mr_event;
init_completion(&dev->cmd_complete);
/* Turn on the I2C interrupt for current operation */
stu300_irq_enable(dev);
/* Unlock the command block and wait for the event to occur */
spin_unlock_irq(&dev->cmd_issue_lock);
ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
STU300_TIMEOUT);
if (ret < 0) {
dev_err(&dev->pdev->dev,
"wait_for_completion_interruptible_timeout()"
"returned %d waiting for event %04x\n", ret, mr_event);
return ret;
}
if (ret == 0) {
if (mr_event != STU300_EVENT_6) {
dev_err(&dev->pdev->dev, "controller "
"timed out waiting for event %d, reinit "
"hardware\n", mr_event);
(void) stu300_init_hw(dev);
}
return -ETIMEDOUT;
}
if (dev->cmd_err != STU300_ERROR_NONE) {
if (mr_event != STU300_EVENT_6) {
dev_err(&dev->pdev->dev, "controller "
"error (await_event) %d waiting for event %d, "
"reinit hardware\n", dev->cmd_err, mr_event);
(void) stu300_init_hw(dev);
}
return -EIO;
}
return 0;
}
static int stu300_start_and_await_event(struct stu300_dev *dev,
u8 cr_value,
enum stu300_event mr_event)
{
int ret;
if (unlikely(irqs_disabled())) {
WARN(1, "irqs are disabled, cannot poll for event\n");
return -EIO;
}
spin_lock_irq(&dev->cmd_issue_lock);
init_completion(&dev->cmd_complete);
dev->cmd_err = STU300_ERROR_NONE;
dev->cmd_event = mr_event;
spin_unlock_irq(&dev->cmd_issue_lock);
cr_value |= I2C_CR_INTERRUPT_ENABLE;
stu300_wr8(cr_value, dev->virtbase + I2C_CR);
ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
STU300_TIMEOUT);
if (ret < 0) {
dev_err(&dev->pdev->dev,
"wait_for_completion_interruptible_timeout() "
"returned %d waiting for event %04x\n", ret, mr_event);
return ret;
}
if (ret == 0) {
dev_err(&dev->pdev->dev, "controller timed out "
"waiting for event %d, reinit hardware\n", mr_event);
(void) stu300_init_hw(dev);
return -ETIMEDOUT;
}
if (dev->cmd_err != STU300_ERROR_NONE) {
dev_err(&dev->pdev->dev, "controller (start) "
"error %d waiting for event %d, reinit hardware\n",
dev->cmd_err, mr_event);
(void) stu300_init_hw(dev);
return -EIO;
}
return 0;
}
static int stu300_wait_while_busy(struct stu300_dev *dev)
{
unsigned long timeout;
int i;
for (i = 0; i < BUSY_RELEASE_ATTEMPTS; i++) {
timeout = jiffies + STU300_TIMEOUT;
while (!time_after(jiffies, timeout)) {
if ((stu300_r8(dev->virtbase + I2C_SR1) &
I2C_SR1_BUSY_IND) == 0)
return 0;
msleep(1);
}
dev_err(&dev->pdev->dev, "transaction timed out "
"waiting for device to be free (not busy). "
"Attempt: %d\n", i+1);
dev_err(&dev->pdev->dev, "base address = "
"0x%08x, reinit hardware\n", (u32) dev->virtbase);
(void) stu300_init_hw(dev);
}
dev_err(&dev->pdev->dev, "giving up after %d attempts "
"to reset the bus.\n", BUSY_RELEASE_ATTEMPTS);
return -ETIMEDOUT;
}