linux-kernel - RE: Re: [PATCH v4] serial/8250: Add support for NI-Serial PXI/PXIe+485 devices

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Message-ID: <MN2PR04MB59204DF262EBDD75E9216F51B7C00@MN2PR04MB5920.namprd04.prod.outlook.com>
Date:   Fri, 26 Jul 2019 02:41:58 +0000
From:   Je Yen Tam <je.yen.tam@...com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: 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@...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