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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Antony Pavlov <antonynpavlov@gmail.com>, barebox@lists.infradead.org
Subject: Re: [PATCH 3/9] serial: add litex UART driver
Date: Wed, 5 May 2021 12:32:04 +0200	[thread overview]
Message-ID: <f5602ba7-64cb-7135-7c76-eb2afa6c3d52@pengutronix.de> (raw)
In-Reply-To: <20210505100900.88141-4-antonynpavlov@gmail.com>



On 05.05.21 12:08, Antony Pavlov wrote:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  drivers/serial/Makefile       |  1 +
>  drivers/serial/serial_litex.c | 96 +++++++++++++++++++++++++++++++++++
>  2 files changed, 97 insertions(+)
> 
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index 7ff41cd5c7..95c3387d3e 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -23,3 +23,4 @@ obj-$(CONFIG_DRIVER_SERIAL_EFI_STDIO)		+= efi-stdio.o
>  obj-$(CONFIG_DRIVER_SERIAL_DIGIC)		+= serial_digic.o
>  obj-$(CONFIG_DRIVER_SERIAL_LPUART)		+= serial_lpuart.o
>  obj-$(CONFIG_VIRTIO_CONSOLE)			+= virtio_console.o
> +obj-$(CONFIG_MACH_LITEX)			+= serial_litex.o
> diff --git a/drivers/serial/serial_litex.c b/drivers/serial/serial_litex.c
> new file mode 100644
> index 0000000000..dec3d99fd0
> --- /dev/null
> +++ b/drivers/serial/serial_litex.c
> @@ -0,0 +1,96 @@
> +// SPDX-License-Identifier: GPL-2.
> +/*
> + * Copyright (C) 2019 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <malloc.h>

That header is unused, isn't it?

> +#include <io.h>
> +
> +#include <mach/debug_ll.h>

This seems unused as well.

> +static inline uint32_t litex_serial_readb(struct console_device *cdev,
> +						uint32_t offset)
> +{
> +	void __iomem *base = cdev->dev->priv;
> +
> +	return readb(base + offset);
> +}
> +
> +static inline void litex_serial_writeb(struct console_device *cdev,
> +					uint32_t value, uint32_t offset)
> +{
> +	void __iomem *base = cdev->dev->priv;
> +
> +	writeb(value, base + offset);
> +}
> +
> +static void litex_serial_putc(struct console_device *cdev, char c)
> +{
> +	while (litex_serial_readb(cdev, UART_TXFULL))
> +		;
> +
> +	litex_serial_writeb(cdev, c, UART_RXTX);
> +}
> +
> +static int litex_serial_getc(struct console_device *cdev)
> +{
> +	int c;
> +
> +	while (litex_serial_readb(cdev, UART_RXEMPTY))
> +		;
> +
> +	c = litex_serial_readb(cdev, UART_RXTX);
> +
> +	/* refresh UART_RXEMPTY by writing UART_EV_RX to UART_EV_PENDING */
> +	litex_serial_writeb(cdev, UART_EV_RX, UART_EV_PENDING);
> +
> +	return c;
> +}
> +
> +static int litex_serial_tstc(struct console_device *cdev)
> +{
> +	if (litex_serial_readb(cdev, UART_RXEMPTY)) {
> +		return 0;
> +	}
> +
> +	return 1;

return directly?

> +}
> +
> +static int litex_serial_probe(struct device_d *dev)
> +{
> +	struct resource *iores;
> +	struct console_device *cdev;
> +
> +	cdev = xzalloc(sizeof(struct console_device));
> +	iores = dev_request_mem_resource(dev, 0);
> +	if (IS_ERR(iores))
> +		return PTR_ERR(iores);

blank line.

> +	dev->priv = IOMEM(iores->start);
> +	cdev->dev = dev;
> +	cdev->tstc = &litex_serial_tstc;
> +	cdev->putc = &litex_serial_putc;
> +	cdev->getc = &litex_serial_getc;
> +	cdev->setbrg = NULL;
> +
> +	console_register(cdev);
> +
> +	return 0;
> +}
> +
> +static __maybe_unused struct of_device_id litex_serial_dt_ids[] = {
> +	{
> +		.compatible = "litex,uart",
> +	}, {
> +		/* sentinel */
> +	}
> +};
> +
> +static struct driver_d litex_serial_driver = {
> +	.name  = "litex-uart",
> +	.probe = litex_serial_probe,
> +	.of_compatible = DRV_OF_COMPAT(litex_serial_dt_ids),
> +};
> +console_platform_driver(litex_serial_driver);

-- 
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  reply	other threads:[~2021-05-05 10:33 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05 10:08 [PATCH 0/9] RISC-V: add LiteX SoC support; resurrect nmon Antony Pavlov
2021-05-05 10:08 ` [PATCH 1/9] RISC-V: make it possible to run nmon from PBL C code Antony Pavlov
2021-05-05 10:27   ` Ahmad Fatoum
2021-05-05 10:08 ` [PATCH 2/9] RISC-V: boards: erizo: make it possible to use nmon Antony Pavlov
2021-05-05 10:28   ` Ahmad Fatoum
2021-05-05 10:08 ` [PATCH 3/9] serial: add litex UART driver Antony Pavlov
2021-05-05 10:32   ` Ahmad Fatoum [this message]
2021-05-05 10:08 ` [PATCH 4/9] gpio: add driver for 74xx-ICs with MMIO access Antony Pavlov
2021-05-05 10:35   ` Ahmad Fatoum
2021-05-05 10:08 ` [PATCH 5/9] spi: add litex spiflash driver Antony Pavlov
2021-05-05 10:39   ` Ahmad Fatoum
2021-05-05 15:10     ` Antony Pavlov
2021-05-05 10:08 ` [PATCH 6/9] net: add LiteEth driver Antony Pavlov
2021-05-06 10:10   ` Roland Hieber
2021-05-06 11:33     ` Antony Pavlov
2021-05-05 10:08 ` [PATCH 7/9] RISC-V: add initial LiteX SoC support Antony Pavlov
2021-05-05 10:16   ` Ahmad Fatoum
2021-05-05 10:45   ` Jan Lübbe
2021-05-05 15:23     ` Antony Pavlov
2021-05-05 10:08 ` [PATCH 8/9] RISC-V: add litex-linux board support Antony Pavlov
2021-05-05 10:19   ` Ahmad Fatoum
2021-05-05 10:36     ` Antony Pavlov
2021-05-05 10:09 ` [PATCH 9/9] RISC-V: add litex_linux_defconfig Antony Pavlov

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