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Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-mxs.c45
-rw-r--r--drivers/i2c/busses/i2c-mxs.h1
2 files changed, 30 insertions, 16 deletions
diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c
index e3235ff8e551..8bb795e7d7b2 100644
--- a/drivers/i2c/busses/i2c-mxs.c
+++ b/drivers/i2c/busses/i2c-mxs.c
@@ -68,10 +68,19 @@ static u8 *i2c_buf_virt;
static void hw_i2c_dmachan_reset(struct mxs_i2c_dev *dev)
{
+ mxs_dma_disable(dev->dma_chan);
mxs_dma_reset(dev->dma_chan);
mxs_dma_ack_irq(dev->dma_chan);
}
+static mxs_i2c_reset(struct mxs_i2c_dev *mxs_i2c)
+{
+ hw_i2c_dmachan_reset(mxs_i2c);
+ mxs_dma_enable_irq(mxs_i2c->dma_chan, 1);
+ mxs_reset_block((void __iomem *)mxs_i2c->regbase, 0);
+ __raw_writel(0x0000FF00, mxs_i2c->regbase + HW_I2C_CTRL1_SET);
+}
+
static int hw_i2c_dma_init(struct platform_device *pdev)
{
struct mxs_i2c_dev *mxs_i2c = platform_get_drvdata(pdev);
@@ -159,7 +168,7 @@ static void hw_i2c_dma_setup_read(u8 addr, void *buff, int len, int flags)
desc[0]->cmd.cmd.bits.pio_words = 1;
desc[0]->cmd.cmd.bits.wait4end = 1;
desc[0]->cmd.cmd.bits.dec_sem = 1;
- desc[0]->cmd.cmd.bits.irq = 1;
+ desc[0]->cmd.cmd.bits.irq = 0;
desc[0]->cmd.cmd.bits.chain = 1;
desc[0]->cmd.cmd.bits.command = DMA_READ;
desc[0]->cmd.address = i2c_buf_phys;
@@ -319,6 +328,7 @@ static int mxs_i2c_xfer_msg(struct i2c_adapter *adap,
msecs_to_jiffies(1000)
);
if (err <= 0) {
+ mxs_i2c_reset(dev);
dev_dbg(dev->dev, "controller is timed out\n");
return -ETIMEDOUT;
}
@@ -365,9 +375,19 @@ static irqreturn_t mxs_i2c_dma_isr(int this_irq, void *dev_id)
mxs_dma_ack_irq(mxs_i2c->dma_chan);
mxs_dma_cooked(mxs_i2c->dma_chan, &list);
+ complete(&mxs_i2c->cmd_complete);
+
return IRQ_HANDLED;
}
+static void mxs_i2c_task(struct work_struct *work)
+{
+ struct mxs_i2c_dev *mxs_i2c = container_of(work,
+ struct mxs_i2c_dev, work);
+ mxs_i2c_reset(mxs_i2c);
+ complete(&mxs_i2c->cmd_complete);
+}
+
#define I2C_IRQ_MASK 0x000000FF
static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id)
{
@@ -382,20 +402,8 @@ static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id)
if (stat & BM_I2C_CTRL1_NO_SLAVE_ACK_IRQ) {
mxs_i2c->cmd_err = -EREMOTEIO;
-
- /*
- * Stop DMA
- * Clear NAK
- */
- __raw_writel(BM_I2C_CTRL1_CLR_GOT_A_NAK,
- mxs_i2c->regbase + HW_I2C_CTRL1_SET);
- hw_i2c_dmachan_reset(mxs_i2c);
- mxs_reset_block((void __iomem *)mxs_i2c->regbase, 1);
- /* Will catch all error (IRQ mask) */
- __raw_writel(0x0000FF00, mxs_i2c->regbase + HW_I2C_CTRL1_SET);
-
- complete(&mxs_i2c->cmd_complete);
-
+ /* it takes long time to reset i2c */
+ schedule_work(&mxs_i2c->work);
goto done;
}
@@ -407,7 +415,10 @@ static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id)
complete(&mxs_i2c->cmd_complete);
goto done;
}
- if ((stat & done_mask) == done_mask)
+
+ if ((stat & done_mask) == done_mask &&
+ (mxs_i2c->flags & MXS_I2C_PIOQUEUE_MODE))
+
complete(&mxs_i2c->cmd_complete);
done:
@@ -524,6 +535,8 @@ static int mxs_i2c_probe(struct platform_device *pdev)
}
+ INIT_WORK(&mxs_i2c->work, mxs_i2c_task);
+
return 0;
no_i2c_adapter:
diff --git a/drivers/i2c/busses/i2c-mxs.h b/drivers/i2c/busses/i2c-mxs.h
index 4ddca007624a..1a35385b793b 100644
--- a/drivers/i2c/busses/i2c-mxs.h
+++ b/drivers/i2c/busses/i2c-mxs.h
@@ -37,5 +37,6 @@ struct mxs_i2c_dev {
struct i2c_adapter adapter;
spinlock_t lock;
wait_queue_head_t queue;
+ struct work_struct work;
};
#endif