#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/regulator/consumer.h>
#include <plat/i2c.h>
I2C_READ = 0x01
};
-/* controller response timeout in ms */
-#define I2C_TIMEOUT_MS 2000
-
/**
* struct i2c_nmk_client - client specific data
* @slave_adr: 7-bit slave address
* @stop: stop condition
* @xfer_complete: acknowledge completion for a I2C message
* @result: controller propogated result
+ * @busy: Busy doing transfer
*/
struct nmk_i2c_dev {
struct platform_device *pdev;
int stop;
struct completion xfer_complete;
int result;
+ struct regulator *regulator;
+ bool busy;
};
/* controller's abort causes */
writel((I2C_CR_FTX | I2C_CR_FRX), dev->virtbase + I2C_CR);
for (i = 0; i < LOOP_ATTEMPTS; i++) {
- timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT_MS);
+ timeout = jiffies + msecs_to_jiffies(dev->adap.timeout);
while (!time_after(jiffies, timeout)) {
if ((readl(dev->virtbase + I2C_CR) &
stat = flush_i2c_fifo(dev);
if (stat)
- return stat;
+ goto exit;
/* disable the controller */
i2c_clr_bit(dev->virtbase + I2C_CR , I2C_CR_PE);
dev->cli.operation = I2C_NO_OPERATION;
+exit:
+ /* TODO: Why disable clocks after init hw? */
clk_disable(dev->clk);
-
+ /*
+ * TODO: What is this delay for?
+ * Must be pretty pointless since the hw block
+ * is frozen. Or?
+ */
udelay(I2C_DELAY);
- return 0;
+ return stat;
}
/* enable peripheral, master mode operation */
dev->virtbase + I2C_IMSCR);
timeout = wait_for_completion_interruptible_timeout(
- &dev->xfer_complete, msecs_to_jiffies(I2C_TIMEOUT_MS));
+ &dev->xfer_complete, msecs_to_jiffies(dev->adap.timeout));
if (timeout < 0) {
dev_err(&dev->pdev->dev,
dev->virtbase + I2C_IMSCR);
timeout = wait_for_completion_interruptible_timeout(
- &dev->xfer_complete, msecs_to_jiffies(I2C_TIMEOUT_MS));
+ &dev->xfer_complete, msecs_to_jiffies(dev->adap.timeout));
if (timeout < 0) {
dev_err(&dev->pdev->dev,
u32 cause;
struct nmk_i2c_dev *dev = i2c_get_adapdata(i2c_adap);
+ dev->busy = true;
+
+ if (dev->regulator)
+ regulator_enable(dev->regulator);
+
status = init_hw(dev);
if (status)
- return status;
+ goto out2;
clk_enable(dev->clk);
if (unlikely(msgs[i].flags & I2C_M_TEN)) {
dev_err(&dev->pdev->dev, "10 bit addressing"
"not supported\n");
- return -EINVAL;
+
+ status = -EINVAL;
+ goto out;
}
dev->cli.slave_adr = msgs[i].addr;
dev->cli.buffer = msgs[i].buf;
dev_err(&dev->pdev->dev, "%s\n",
cause >= ARRAY_SIZE(abort_causes)
? "unknown reason" : abort_causes[cause]);
- clk_disable(dev->clk);
- return status;
+
+ status = status ? status : dev->result;
+
+ goto out;
}
udelay(I2C_DELAY);
}
+
+out:
clk_disable(dev->clk);
+out2:
+ if (dev->regulator)
+ regulator_disable(dev->regulator);
+
+ dev->busy = false;
/* return the no. messages processed */
if (status)
| I2C_IT_RXFF | I2C_IT_RXFE));
if (dev->cli.count) {
- dev->result = -1;
+ dev->result = -EIO;
dev_err(&dev->pdev->dev, "%lu bytes still remain to be"
"xfered\n", dev->cli.count);
(void) init_hw(dev);
/* Master Arbitration lost interrupt */
case I2C_IT_MAL:
- dev->result = -1;
+ dev->result = -EIO;
(void) init_hw(dev);
i2c_set_bit(dev->virtbase + I2C_ICR, I2C_IT_MAL);
* during the transaction.
*/
case I2C_IT_BERR:
- dev->result = -1;
+ dev->result = -EIO;
/* get the status */
if (((readl(dev->virtbase + I2C_SR) >> 2) & 0x3) == I2C_ABORT)
(void) init_hw(dev);
* the Tx FIFO is full.
*/
case I2C_IT_TXFOVR:
- dev->result = -1;
+ dev->result = -EIO;
(void) init_hw(dev);
dev_err(&dev->pdev->dev, "Tx Fifo Over run\n");
return IRQ_HANDLED;
}
+
+#ifdef CONFIG_PM
+static int nmk_i2c_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ struct nmk_i2c_dev *dev = platform_get_drvdata(pdev);
+
+ if (dev->busy)
+ return -EBUSY;
+ else
+ return 0;
+}
+#else
+#define nmk_i2c_suspend NULL
+#endif
+
static unsigned int nmk_i2c_functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
ret = -ENOMEM;
goto err_no_mem;
}
-
+ dev->busy = false;
dev->pdev = pdev;
platform_set_drvdata(pdev, dev);
goto err_irq;
}
+ dev->regulator = regulator_get(&pdev->dev, "v-i2c");
+ if (IS_ERR(dev->regulator)) {
+ dev_warn(&pdev->dev, "could not get i2c regulator\n");
+ dev->regulator = NULL;
+ }
+
dev->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk)) {
dev_err(&pdev->dev, "could not get i2c clock\n");
adap->owner = THIS_MODULE;
adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
adap->algo = &nmk_i2c_algo;
+ adap->timeout = pdata->timeout ? pdata->timeout : 20000;
snprintf(adap->name, sizeof(adap->name),
"Nomadik I2C%d at %lx", pdev->id, (unsigned long)res->start);
i2c_set_adapdata(adap, dev);
- ret = init_hw(dev);
- if (ret != 0) {
- dev_err(&pdev->dev, "error in initializing i2c hardware\n");
- goto err_init_hw;
- }
-
dev_info(&pdev->dev, "initialize %s on virtual "
"base %p\n", adap->name, dev->virtbase);
return 0;
- err_init_hw:
err_add_adap:
clk_put(dev->clk);
err_no_clk:
+ if (dev->regulator)
+ regulator_put(dev->regulator);
free_irq(dev->irq, dev);
err_irq:
iounmap(dev->virtbase);
if (res)
release_mem_region(res->start, resource_size(res));
clk_put(dev->clk);
+ if (dev->regulator)
+ regulator_put(dev->regulator);
platform_set_drvdata(pdev, NULL);
kfree(dev);
},
.probe = nmk_i2c_probe,
.remove = __devexit_p(nmk_i2c_remove),
+ .suspend = nmk_i2c_suspend,
};
static int __init nmk_i2c_init(void)
git.openpandora.org / pandora-kernel.git / blobdiff