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-rw-r--r--drivers/i2c/busses/i2c-eg20t.c41
-rw-r--r--drivers/i2c/busses/i2c-nomadik.c9
-rw-r--r--drivers/i2c/busses/i2c-omap.c29
-rw-r--r--drivers/i2c/busses/i2c-pxa-pci.c5
-rw-r--r--drivers/i2c/busses/i2c-tegra.c77
5 files changed, 91 insertions, 70 deletions
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 8abfa4a03ce..ce1a32b71e4 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -673,32 +673,33 @@ static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
/* transfer not completed */
adap->pch_i2c_xfer_in_progress = true;
- pmsg = &msgs[0];
- pmsg->flags |= adap->pch_buff_mode_en;
- status = pmsg->flags;
- pch_dbg(adap,
- "After invoking I2C_MODE_SEL :flag= 0x%x\n", status);
- /* calculate sub address length and message length */
- /* these are applicable only for buffer mode */
- subaddrlen = pmsg->buf[0];
- /* calculate actual message length excluding
- * the sub address fields */
- msglen = (pmsg->len) - (subaddrlen + 1);
- if (status & (I2C_M_RD)) {
- pch_dbg(adap, "invoking pch_i2c_readbytes\n");
- ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num),
- (i == 0));
- } else {
- pch_dbg(adap, "invoking pch_i2c_writebytes\n");
- ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num),
- (i == 0));
+ for (i = 0; i < num && ret >= 0; i++) {
+ pmsg = &msgs[i];
+ pmsg->flags |= adap->pch_buff_mode_en;
+ status = pmsg->flags;
+ pch_dbg(adap,
+ "After invoking I2C_MODE_SEL :flag= 0x%x\n", status);
+ /* calculate sub address length and message length */
+ /* these are applicable only for buffer mode */
+ subaddrlen = pmsg->buf[0];
+ /* calculate actual message length excluding
+ * the sub address fields */
+ msglen = (pmsg->len) - (subaddrlen + 1);
+
+ if ((status & (I2C_M_RD)) != false) {
+ ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num),
+ (i == 0));
+ } else {
+ ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num),
+ (i == 0));
+ }
}
adap->pch_i2c_xfer_in_progress = false; /* transfer completed */
mutex_unlock(&pch_mutex);
- return ret;
+ return (ret < 0) ? ret : num;
}
/**
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 0c731ca69f1..b228e09c5d0 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -146,6 +146,7 @@ struct i2c_nmk_client {
* @stop: stop condition
* @xfer_complete: acknowledge completion for a I2C message
* @result: controller propogated result
+ * @regulator: pointer to i2c regulator
* @busy: Busy doing transfer
*/
struct nmk_i2c_dev {
@@ -417,12 +418,12 @@ static int read_i2c(struct nmk_i2c_dev *dev)
writel(readl(dev->virtbase + I2C_IMSCR) | irq_mask,
dev->virtbase + I2C_IMSCR);
- timeout = wait_for_completion_interruptible_timeout(
+ timeout = wait_for_completion_timeout(
&dev->xfer_complete, dev->adap.timeout);
if (timeout < 0) {
dev_err(&dev->pdev->dev,
- "wait_for_completion_interruptible_timeout"
+ "wait_for_completion_timeout"
"returned %d waiting for event\n", timeout);
status = timeout;
}
@@ -504,12 +505,12 @@ static int write_i2c(struct nmk_i2c_dev *dev)
writel(readl(dev->virtbase + I2C_IMSCR) | irq_mask,
dev->virtbase + I2C_IMSCR);
- timeout = wait_for_completion_interruptible_timeout(
+ timeout = wait_for_completion_timeout(
&dev->xfer_complete, dev->adap.timeout);
if (timeout < 0) {
dev_err(&dev->pdev->dev,
- "wait_for_completion_interruptible_timeout"
+ "wait_for_completion_timeout "
"returned %d waiting for event\n", timeout);
status = timeout;
}
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 1a766cf74f6..2dfb6317685 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1139,41 +1139,12 @@ omap_i2c_remove(struct platform_device *pdev)
return 0;
}
-#ifdef CONFIG_SUSPEND
-static int omap_i2c_suspend(struct device *dev)
-{
- if (!pm_runtime_suspended(dev))
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend)
- dev->bus->pm->runtime_suspend(dev);
-
- return 0;
-}
-
-static int omap_i2c_resume(struct device *dev)
-{
- if (!pm_runtime_suspended(dev))
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume)
- dev->bus->pm->runtime_resume(dev);
-
- return 0;
-}
-
-static struct dev_pm_ops omap_i2c_pm_ops = {
- .suspend = omap_i2c_suspend,
- .resume = omap_i2c_resume,
-};
-#define OMAP_I2C_PM_OPS (&omap_i2c_pm_ops)
-#else
-#define OMAP_I2C_PM_OPS NULL
-#endif
-
static struct platform_driver omap_i2c_driver = {
.probe = omap_i2c_probe,
.remove = omap_i2c_remove,
.driver = {
.name = "omap_i2c",
.owner = THIS_MODULE,
- .pm = OMAP_I2C_PM_OPS,
},
};
diff --git a/drivers/i2c/busses/i2c-pxa-pci.c b/drivers/i2c/busses/i2c-pxa-pci.c
index 6659d269b84..b73da6cd6f9 100644
--- a/drivers/i2c/busses/i2c-pxa-pci.c
+++ b/drivers/i2c/busses/i2c-pxa-pci.c
@@ -109,12 +109,15 @@ static int __devinit ce4100_i2c_probe(struct pci_dev *dev,
return -EINVAL;
}
sds = kzalloc(sizeof(*sds), GFP_KERNEL);
- if (!sds)
+ if (!sds) {
+ ret = -ENOMEM;
goto err_mem;
+ }
for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
sds->pdev[i] = add_i2c_device(dev, i);
if (IS_ERR(sds->pdev[i])) {
+ ret = PTR_ERR(sds->pdev[i]);
while (--i >= 0)
platform_device_unregister(sds->pdev[i]);
goto err_dev_add;
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index fb3b4f8f815..3c94c4a81a5 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -26,6 +26,7 @@
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/i2c-tegra.h>
+#include <linux/of_i2c.h>
#include <asm/unaligned.h>
@@ -269,14 +270,30 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
/* Rounds down to not include partial word at the end of buf */
words_to_transfer = buf_remaining / BYTES_PER_FIFO_WORD;
- if (words_to_transfer > tx_fifo_avail)
- words_to_transfer = tx_fifo_avail;
- i2c_writesl(i2c_dev, buf, I2C_TX_FIFO, words_to_transfer);
-
- buf += words_to_transfer * BYTES_PER_FIFO_WORD;
- buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
- tx_fifo_avail -= words_to_transfer;
+ /* It's very common to have < 4 bytes, so optimize that case. */
+ if (words_to_transfer) {
+ if (words_to_transfer > tx_fifo_avail)
+ words_to_transfer = tx_fifo_avail;
+
+ /*
+ * Update state before writing to FIFO. If this casues us
+ * to finish writing all bytes (AKA buf_remaining goes to 0) we
+ * have a potential for an interrupt (PACKET_XFER_COMPLETE is
+ * not maskable). We need to make sure that the isr sees
+ * buf_remaining as 0 and doesn't call us back re-entrantly.
+ */
+ buf_remaining -= words_to_transfer * BYTES_PER_FIFO_WORD;
+ tx_fifo_avail -= words_to_transfer;
+ i2c_dev->msg_buf_remaining = buf_remaining;
+ i2c_dev->msg_buf = buf +
+ words_to_transfer * BYTES_PER_FIFO_WORD;
+ barrier();
+
+ i2c_writesl(i2c_dev, buf, I2C_TX_FIFO, words_to_transfer);
+
+ buf += words_to_transfer * BYTES_PER_FIFO_WORD;
+ }
/*
* If there is a partial word at the end of buf, handle it manually to
@@ -286,14 +303,15 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
if (tx_fifo_avail > 0 && buf_remaining > 0) {
BUG_ON(buf_remaining > 3);
memcpy(&val, buf, buf_remaining);
+
+ /* Again update before writing to FIFO to make sure isr sees. */
+ i2c_dev->msg_buf_remaining = 0;
+ i2c_dev->msg_buf = NULL;
+ barrier();
+
i2c_writel(i2c_dev, val, I2C_TX_FIFO);
- buf_remaining = 0;
- tx_fifo_avail--;
}
- BUG_ON(tx_fifo_avail > 0 && buf_remaining > 0);
- i2c_dev->msg_buf_remaining = buf_remaining;
- i2c_dev->msg_buf = buf;
return 0;
}
@@ -410,9 +428,10 @@ static irqreturn_t tegra_i2c_isr(int irq, void *dev_id)
tegra_i2c_mask_irq(i2c_dev, I2C_INT_TX_FIFO_DATA_REQ);
}
- if ((status & I2C_INT_PACKET_XFER_COMPLETE) &&
- !i2c_dev->msg_buf_remaining)
+ if (status & I2C_INT_PACKET_XFER_COMPLETE) {
+ BUG_ON(i2c_dev->msg_buf_remaining);
complete(&i2c_dev->msg_complete);
+ }
i2c_writel(i2c_dev, status, I2C_INT_STATUS);
if (i2c_dev->is_dvc)
@@ -530,7 +549,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
static u32 tegra_i2c_func(struct i2c_adapter *adap)
{
- return I2C_FUNC_I2C;
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm tegra_i2c_algo = {
@@ -546,6 +565,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
struct resource *iomem;
struct clk *clk;
struct clk *i2c_clk;
+ const unsigned int *prop;
void *base;
int irq;
int ret = 0;
@@ -603,7 +623,17 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->irq = irq;
i2c_dev->cont_id = pdev->id;
i2c_dev->dev = &pdev->dev;
- i2c_dev->bus_clk_rate = pdata ? pdata->bus_clk_rate : 100000;
+
+ i2c_dev->bus_clk_rate = 100000; /* default clock rate */
+ if (pdata) {
+ i2c_dev->bus_clk_rate = pdata->bus_clk_rate;
+
+ } else if (i2c_dev->dev->of_node) { /* if there is a device tree node ... */
+ prop = of_get_property(i2c_dev->dev->of_node,
+ "clock-frequency", NULL);
+ if (prop)
+ i2c_dev->bus_clk_rate = be32_to_cpup(prop);
+ }
if (pdev->id == 3)
i2c_dev->is_dvc = 1;
@@ -633,6 +663,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->adapter.algo = &tegra_i2c_algo;
i2c_dev->adapter.dev.parent = &pdev->dev;
i2c_dev->adapter.nr = pdev->id;
+ i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
if (ret) {
@@ -640,6 +671,8 @@ static int tegra_i2c_probe(struct platform_device *pdev)
goto err_free_irq;
}
+ of_i2c_register_devices(&i2c_dev->adapter);
+
return 0;
err_free_irq:
free_irq(i2c_dev->irq, i2c_dev);
@@ -704,6 +737,17 @@ static int tegra_i2c_resume(struct platform_device *pdev)
}
#endif
+#if defined(CONFIG_OF)
+/* Match table for of_platform binding */
+static const struct of_device_id tegra_i2c_of_match[] __devinitconst = {
+ { .compatible = "nvidia,tegra20-i2c", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);
+#else
+#define tegra_i2c_of_match NULL
+#endif
+
static struct platform_driver tegra_i2c_driver = {
.probe = tegra_i2c_probe,
.remove = tegra_i2c_remove,
@@ -714,6 +758,7 @@ static struct platform_driver tegra_i2c_driver = {
.driver = {
.name = "tegra-i2c",
.owner = THIS_MODULE,
+ .of_match_table = tegra_i2c_of_match,
},
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-21 23:26:48 +0000