On Fri, 24 Jul 2015 13:55:39 +0800, Peter Hung wrote:
> Add RS485 control for Fintek F81504/508/512
>
> F81504/508/512 can control their RTS with H/W mode.
> PCI configuration space for each port is 0x40 + idx * 8 + 7.
>
> When it set with 0x01, it's configured with RS232 mode.
> RTS is controlled by MCR.
>
> When it set with 0x11, it's configured with RS485 mode.
> RTS is controlled by H/W, RTS high with idle & RX, low with TX.
>
> When it set with 0x31, it's configured with RS485 mode.
> RTS is controlled by H/W, RTS low with idle & RX, high with TX.
>
> We will force 0x01 on pci_fintek_setup().
>
> Signed-off-by: Peter Hung <hpeter+linux_kernel@xxxxxxxxx>
> ---
> drivers/tty/serial/8250/8250_pci.c | 44 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> index e55f18b..36280fa 100644
> --- a/drivers/tty/serial/8250/8250_pci.c
> +++ b/drivers/tty/serial/8250/8250_pci.c
> @@ -1685,11 +1685,43 @@ pci_brcm_trumanage_setup(struct serial_private *priv,
> return ret;
> }
>
> +static int pci_fintek_rs485_config(struct uart_port *port,
> + struct serial_rs485 *rs485)
> +{
> + u8 setting;
> + u8 *index = (u8 *) port->private_data;
> + struct pci_dev *pci_dev = container_of(port->dev, struct pci_dev,
> + dev);
This looks misaligned. 'dev' should be aligned with opening
parenthesis.
> +
> + pci_read_config_byte(pci_dev, 0x40 + 8 * *index + 7, &setting);
> +
> + if (rs485->flags & SER_RS485_ENABLED) {
> + /* Enable RTS H/W control mode */
> + setting |= BIT(4);
Please add defines with the bit names.
> +
> + if (rs485->flags & SER_RS485_RTS_ON_SEND) {
> + /* RTS driving high on TX */
> + setting |= BIT(5);
> + } else {
> + /* RTS driving low on TX */
> + setting &= ~BIT(5);
> + }
> + } else {
> + /* Disable RTS H/W control mode */
> + setting &= ~(BIT(4) | BIT(5));
> + }
Please make sure you correct the rs485 configuration with what you can
actually support. Look at 8250_lpc18xx.c as an example. In your case
when the function returns it should have SER_RS485_ENABLED and one of
SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND set and nothing else
(or be completely zeroed if SER_RS485_ENABLED was not set).
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