[PATCH v2] i2c: axxia: Add I2C driver for AXM55xx

Anders Berg
2014-09-29T11:13:00Z

On Mon, Sep 29, 2014 at 12:07 PM, Varka Bhadram <varkabhadram@gmail.com> wrote:
> On 09/29/2014 03:02 PM, Anders Berg wrote:
>>
>> Add I2C bus driver for the controller found in the LSI Axxia family SoCs.
>> The
>> driver implements 10-bit addressing and SMBus transfer modes via emulation
>> (including SMBus block data read).
>>
>> Signed-off-by: Anders Berg <anders.berg@avagotech.com>
>> ---
>>
(...)
>> +
>> + if (!idev->msg) {
>> + dev_warn(idev->dev, "unexpected interrupt");
>
>
> Missed terminating new line '\n'
>

Right, I'll fix that (all occurrences)

>
>> + goto out;
>> + }
>> +
>> + /* RX FIFO needs service? */
>> + if (i2c_m_rd(idev->msg) && (status & MST_STATUS_RFL))
>> + axxia_i2c_empty_rx_fifo(idev);
>> +
>> + /* TX FIFO needs service? */
>> + if (!i2c_m_rd(idev->msg) && (status & MST_STATUS_TFL)) {
>> + if (axxia_i2c_fill_tx_fifo(idev) == 0)
>> + i2c_int_disable(idev, MST_STATUS_TFL);
>> + }
>> +
>> + if (status & MST_STATUS_SCC) {
>> + /* Stop completed */
>> + i2c_int_disable(idev, ~0);
>> + complete(&idev->msg_complete);
>> + } else if (status & MST_STATUS_SNS) {
>> + /* Transfer done */
>> + i2c_int_disable(idev, ~0);
>> + if (i2c_m_rd(idev->msg) && idev->msg_xfrd <
>> idev->msg->len)
>> + axxia_i2c_empty_rx_fifo(idev);
>> + complete(&idev->msg_complete);
>> + } else if (unlikely(status & MST_STATUS_ERR)) {
>> + /* Transfer error */
>> + i2c_int_disable(idev, ~0);
>> + if (status & MST_STATUS_AL)
>> + idev->msg_err = -EAGAIN;
>> + else if (status & MST_STATUS_NAK)
>> + idev->msg_err = -ENXIO;
>> + else
>> + idev->msg_err = -EIO;
>> + dev_dbg(idev->dev, "error %#x, addr=%#x rx=%u/%u
>> tx=%u/%u\n",
>> + status,
>> + idev->msg->addr,
>> + readl(idev->base + MST_RX_BYTES_XFRD),
>> + readl(idev->base + MST_RX_XFER),
>> + readl(idev->base + MST_TX_BYTES_XFRD),
>> + readl(idev->base + MST_TX_XFER));
>> + complete(&idev->msg_complete);
>> + }
>> +
>> +out:
>> + /* Clear interrupt */
>> + writel(INT_MST, idev->base + INTERRUPT_STATUS);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>
>
> Its looks good if we move the entire ISR above probe/remove
> functionalities...
>

Not sure what you mean here... The ISR _is_ above probe/remove.

/Anders