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SubjectRE: Re: [PATCH v4] serial/8250: Add support for NI-Serial PXI/PXIe+485 devices
> Subject: [EXTERNAL] Re: [PATCH v4] serial/8250: Add support for NI-Serial
> PXI/PXIe+485 devices
>
> On Fri, Jul 05, 2019 at 06:15:28AM -0700, jeyentam wrote:
> > Add support for NI-Serial PXIe-RS232, PXI-RS485 and PXIe-RS485 devices.
> >
> > Signed-off-by: Je Yen Tam <je.yen.tam@ni.com>
> > ---
> > v3 -> v4:
> > - Add changes description.
> >
> > v2 -> v3:
> > - Add "full" name for author
> > - Use BIT() macro for bits definition
> > - Remove unnecessary WARN_ON()
> > - Change debugging interface to ftrace
> > - Fix indentation
> > - Add NI PXIe-RS232 and PXI/PXIe-RS485 device IDs #defines
> >
> > v1 -> v2:
> > - Fix unintended indentation
> >
> > v1:
> > - Add and rename #defines for 16550 UART Port Control Register
> > - Add configuration for RS485 port.
> > - Add device setup for NI PXI/PXIe-RS485 family.
> > - Add PCI board attributes for NI PXIe-RS232 and PXI/PXIe-RS485 devices.
> >
> > drivers/tty/serial/8250/8250_pci.c | 298 ++++++++++++++++++++++++++++-
> > 1 file changed, 294 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> > index df41397de478..23fe3b7197ad 100644
> > --- a/drivers/tty/serial/8250/8250_pci.c
> > +++ b/drivers/tty/serial/8250/8250_pci.c
> > @@ -730,8 +730,16 @@ static int pci_ni8430_init(struct pci_dev *dev)
> > }
> >
> > /* UART Port Control Register */
> > -#define NI8430_PORTCON 0x0f
> > -#define NI8430_PORTCON_TXVR_ENABLE (1 << 3)
> > +#define NI16550_PCR_OFFSET 0x0f
> > +#define NI16550_PCR_RS422 0x00
> > +#define NI16550_PCR_ECHO_RS485 0x01
> > +#define NI16550_PCR_DTR_RS485 0x02
> > +#define NI16550_PCR_AUTO_RS485 0x03
> > +#define NI16550_PCR_WIRE_MODE_MASK 0x03
> > +#define NI16550_PCR_TXVR_ENABLE_BIT BIT(3)
> > +#define NI16550_PCR_RS485_TERMINATION_BIT BIT(6)
> > +#define NI16550_ACR_DTR_AUTO_DTR (0x2 << 3)
> > +#define NI16550_ACR_DTR_MANUAL_DTR (0x0 << 3)
> >
> > static int
> > pci_ni8430_setup(struct serial_private *priv,
> > @@ -753,14 +761,123 @@ pci_ni8430_setup(struct serial_private *priv,
> > return -ENOMEM;
> >
> > /* enable the transceiver */
> > - writeb(readb(p + offset + NI8430_PORTCON) |
> NI8430_PORTCON_TXVR_ENABLE,
> > - p + offset + NI8430_PORTCON);
> > + writeb(readb(p + offset + NI16550_PCR_OFFSET) |
> NI16550_PCR_TXVR_ENABLE_BIT,
> > + p + offset + NI16550_PCR_OFFSET);
> >
> > iounmap(p);
> >
> > return setup_port(priv, port, bar, offset, board->reg_shift);
> > }
> >
> > +static int pci_ni8431_config_rs485(struct uart_port *port,
> > + struct serial_rs485 *rs485)
> > +{
> > + u8 pcr, acr;
> > +
> > + struct uart_8250_port *up;
>
> No blank lines between variable definitions please.

Removed those lines in v5.

>
> > +
> > + up = container_of(port, struct uart_8250_port, port);
> > +
> > + acr = up->acr;
> > +
> > + trace_printk("start ni16550_config_rs485\n");
>
> This line is not needed, right?

Removed in v5.

>
> > +
> > + pcr = port->serial_in(port, NI16550_PCR_OFFSET);
> > + pcr &= ~NI16550_PCR_WIRE_MODE_MASK;
> > +
> > + if (rs485->flags & SER_RS485_ENABLED) {
> > + /* RS-485 */
> > + if ((rs485->flags & SER_RS485_RX_DURING_TX) &&
> > + (rs485->flags & SER_RS485_RTS_ON_SEND)) {
> > + dev_dbg(port->dev, "Invalid 2-wire mode\n");
> > + return -EINVAL;
> > + }
> > +
> > + if (rs485->flags & SER_RS485_RX_DURING_TX) {
> > + /* Echo */
> > + dev_vdbg(port->dev, "2-wire DTR with echo\n");
> > + pcr |= NI16550_PCR_ECHO_RS485;
> > + acr |= NI16550_ACR_DTR_MANUAL_DTR;
> > + } else {
> > + /* Auto or DTR */
> > + if (rs485->flags & SER_RS485_RTS_ON_SEND) {
> > + /* Auto */
> > + dev_vdbg(port->dev, "2-wire Auto\n");
> > + pcr |= NI16550_PCR_AUTO_RS485;
> > + acr |= NI16550_ACR_DTR_AUTO_DTR;
> > + } else {
> > + /* DTR-controlled */
> > + /* No Echo */
> > + dev_vdbg(port->dev, "2-wire DTR no echo\n");
> > + pcr |= NI16550_PCR_DTR_RS485;
> > + acr |= NI16550_ACR_DTR_MANUAL_DTR;
> > + }
> > + }
> > + } else {
> > + /* RS-422 */
> > + dev_vdbg(port->dev, "4-wire\n");
> > + pcr |= NI16550_PCR_RS422;
> > + acr |= NI16550_ACR_DTR_MANUAL_DTR;
> > + }
> > +
> > + dev_dbg(port->dev, "write pcr: 0x%08x\n", pcr);
> > + port->serial_out(port, NI16550_PCR_OFFSET, pcr);
> > +
> > + up->acr = acr;
> > + port->serial_out(port, UART_SCR, UART_ACR);
> > + port->serial_out(port, UART_ICR, up->acr);
> > +
> > + /* Update the cache. */
> > + port->rs485 = *rs485;
> > +
> > + trace_printk("end ni16550_config_rs485\n");
>
> Also drop this.

Removed this too.

>
> thanks,
>
> greg k-h

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