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Message-ID: <73a6b0ae-d94e-4a9e-9964-0484c95c8226@kernel.org>
Date: Mon, 2 Oct 2023 09:14:32 +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 3/4] tty: serial: 8250: Fix MOXA RS422/RS485 PCIe boards
not work by default
On 02. 10. 23, 3:57, Crescent CY Hsieh wrote:
> MOXA PCIe RS422/RS485 boards will not function by default because of the
> initial default serial interface of all MOXA PCIe boards is set to RS232.
>
> This patch fixes the problem above by setting the initial default serial
> interface to RS422 for those MOXA RS422/RS485 PCIe boards.
>
> Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@...a.com>
> ---
> drivers/tty/serial/8250/8250_pci.c | 39 +++++++++++++++++++++++++++++-
> 1 file changed, 38 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
> index a70546ac361e..31bfe5381000 100644
> --- a/drivers/tty/serial/8250/8250_pci.c
> +++ b/drivers/tty/serial/8250/8250_pci.c
> @@ -1890,17 +1890,54 @@ pci_sunix_setup(struct serial_private *priv,
> #define MOXA_PUART_GPIO_EN 0x09
> #define MOXA_PUART_GPIO_OUT 0x0A
>
> +#define MOXA_RS232 0x00
> +#define MOXA_RS422 0x01
> +#define MOXA_RS485_4W 0x0B
> +#define MOXA_RS485_2W 0x0F
> +#define MOXA_UIR_OFFSET 0x04
> +
> #define MOXA_GPIO_SET_ALL_OUTPUT 0x0F
>
> +static int pci_moxa_set_interface(struct pci_dev *dev,
can it be const?
> + unsigned int port_idx,
> + unsigned char mode)
u8
> +{
> + unsigned long iobar_addr = pci_resource_start(dev, 2);
resource_size_t
> + unsigned long UIR_addr = iobar_addr + MOXA_UIR_OFFSET + (port_idx / 2);
resource_size_t. Why the parentheses?
> + unsigned char val, intf;
u8
> + val = inb(UIR_addr);
> +
> + if (port_idx % 2) {
> + intf = mode << 4;
> + val &= 0x0F;
> + } else {
> + intf = mode;
> + val &= 0xF0;
> + }
> + val |= intf;
May be better:
if (port_idx % 2) {
val &= 0x0F;
val |= mode << 4;
} else {
val &= 0xF0;
val |= mode;
}
(no need for intf)?
> + outb(val, UIR_addr);
> +
> + return 0;
> +}
> +
> static int pci_moxa_init(struct pci_dev *dev)
> {
> unsigned short device = dev->device;
> unsigned long iobar_addr = pci_resource_start(dev, 2);
> + int i;
unsigned
> int num_ports = (device & 0x00F0) >> 4;
And this one too (in the previous patch).
> unsigned char val;
>
> outb(MOXA_GPIO_SET_ALL_OUTPUT, iobar_addr + MOXA_PUART_GPIO_EN);
> -
> + /*
> + * For the device IDs of MOXA PCIe boards match the pattern 0x*3**,
> + * the initial default serial interface mode should be set to RS422.
> + */
> + if ((device & 0x0F00) == 0x0300) {
> + for (i = 0; i < num_ports; ++i)
> + pci_moxa_set_interface(dev, i, MOXA_RS422);
> + }
> /*
> * Enable hardware buffer to prevent break signal output when system boot up.
> * This hardware buffer is only supported on Mini PCIe series.
--
js
suse labs
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