linux-kernel - Re: [PATCH 2/4] tty: serial: 8250: Add support for MOXA Mini PCIe boards

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Date:   Mon, 2 Oct 2023 09:05:31 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Crescent CY Hsieh <crescentcy.hsieh@...a.com>,
        gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/4] tty: serial: 8250: Add support for MOXA Mini PCIe
 boards

On 02. 10. 23, 3:57, Crescent CY Hsieh wrote:
> Add support for MOXA Mini PCIe serial boards:
> 
> - CP102N: 2 ports | RS232
> - CP104N: 4 ports | RS232
> - CP112N: 2 ports | RS232/RS422/RS485
> - CP114N: 4 ports | RS232/RS422/RS485
> - CP132N: 2 ports | RS422/RS485
> - CP134N: 4 ports | RS422/RS485
> 
> Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@...a.com>
> ---
>   drivers/tty/serial/8250/8250_pci.c | 54 ++++++++++++++++++++++++++++++
>   1 file changed, 54 insertions(+)
> 
> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> index a010790ccfcd..a70546ac361e 100644
> --- a/drivers/tty/serial/8250/8250_pci.c
> +++ b/drivers/tty/serial/8250/8250_pci.c
> @@ -1887,6 +1887,42 @@ pci_sunix_setup(struct serial_private *priv,
>   	return setup_port(priv, port, bar, offset, 0);
>   }
>   
> +#define MOXA_PUART_GPIO_EN	0x09
> +#define MOXA_PUART_GPIO_OUT	0x0A
> +
> +#define MOXA_GPIO_SET_ALL_OUTPUT	0x0F
> +
> +static int pci_moxa_init(struct pci_dev *dev)
> +{
> +	unsigned short device = dev->device;
> +	unsigned long iobar_addr = pci_resource_start(dev, 2);

resource_size_t

> +	int num_ports = (device & 0x00F0) >> 4;
> +	unsigned char val;

u8

> +
> +	outb(MOXA_GPIO_SET_ALL_OUTPUT, iobar_addr + MOXA_PUART_GPIO_EN);

You need to comment in the commit log why this doesn't matter for other 
moxa cards.

> +	/*
> +	 * Enable hardware buffer to prevent break signal output when system boot up.

boots up.

> +	 * This hardware buffer is only supported on Mini PCIe series.
> +	 */
> +	if (device == 0x1027 ||	/* MOXA_CP102N */
> +	    device == 0x1046 ||	/* MOXA_CP104N */
> +	    device == 0x1121 ||	/* MOXA_CP112N */
> +	    device == 0x1145 ||	/* MOXA_CP114N */
> +	    device == 0x1323 ||	/* MOXA_CP132N */
> +	    device == 0x1343) {	/* MOXA_CP134N */

Why not use the definitions below? You should define a function for this 
anyway.

> +		/* Set GPIO direction */
> +		val = inb(iobar_addr + MOXA_PUART_GPIO_EN);
> +		val |= (1 << 2);

Too magic constant. Use BIT() and define that 2 as some constant.

> +		outb(val, iobar_addr + MOXA_PUART_GPIO_EN);
> +		/* Enable low GPIO */
> +		val = inb(iobar_addr + MOXA_PUART_GPIO_OUT);
> +		val &= ~(1 << 2);
> +		outb(val, iobar_addr + MOXA_PUART_GPIO_OUT);
> +	}

One more \n here.

> +	return num_ports;
> +}
> +
>   static int pci_moxa_setup(struct serial_private *priv,
>   			  const struct pciserial_board *board,
>   			  struct uart_8250_port *port,
> @@ -1973,6 +2009,13 @@ static int pci_moxa_setup(struct serial_private *priv,
>   #define	PCI_DEVICE_ID_MOXA_CP134EL_A	0x1342
>   #define	PCI_DEVICE_ID_MOXA_CP138E_A	0x1381
>   #define	PCI_DEVICE_ID_MOXA_CP168EL_A	0x1683
> +/* MOXA Mini PCIe */
> +#define PCI_DEVICE_ID_MOXA_CP102N	0x1027
> +#define PCI_DEVICE_ID_MOXA_CP104N	0x1046
> +#define PCI_DEVICE_ID_MOXA_CP112N	0x1121
> +#define PCI_DEVICE_ID_MOXA_CP114N	0x1145
> +#define PCI_DEVICE_ID_MOXA_CP132N	0x1323
> +#define PCI_DEVICE_ID_MOXA_CP134N	0x1343

I am not sure it matters they are mini PCIe. I would sort them into the 
above preexisting list instead.

>   
>   /* Unknown vendors/cards - this should not be in linux/pci_ids.h */
>   #define PCI_SUBDEVICE_ID_UNKNOWN_0x1584	0x1584
> @@ -2638,6 +2681,7 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
>   		.device		= PCI_ANY_ID,
>   		.subvendor	= PCI_ANY_ID,
>   		.subdevice	= PCI_ANY_ID,
> +		.init		= pci_moxa_init,
>   		.setup		= pci_moxa_setup,
>   	},
>   	{
> @@ -5365,6 +5409,16 @@ static const struct pci_device_id serial_pci_tbl[] = {
>   	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP138E_A),	 0, 0, pbn_moxa_8 },
>   	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168EL_A),	 0, 0, pbn_moxa_8 },
>   
> +	/*
> +	 * MOXA Mini PCIe
> +	 */
> +	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102N), 0, 0, pbn_moxa_2 },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104N), 0, 0, pbn_moxa_4 },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP112N), 0, 0, pbn_moxa_2 },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114N), 0, 0, pbn_moxa_4 },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132N), 0, 0, pbn_moxa_2 },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134N), 0, 0, pbn_moxa_4 },

PCI_VDEVICE() again?

thanks,
-- 
js
suse labs