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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Antony Pavlov <antonynpavlov@gmail.com>, barebox@lists.infradead.org
Subject: Re: [PATCH RESEND v4 2/8] serial: add litex UART driver
Date: Mon, 23 Aug 2021 13:58:58 +0200
Message-ID: <96981f4e-1345-94c7-a081-3aef68b5d97e@pengutronix.de> (raw)
In-Reply-To: <20210817101104.114945-3-antonynpavlov@gmail.com>

On 17.08.21 12:10, Antony Pavlov wrote:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Tested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
>  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 5120b17376..45055371ea 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -24,3 +24,4 @@ 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_SERIAL_SIFIVE)			+= serial_sifive.o
> +obj-$(CONFIG_SOC_LITEX)				+= serial_litex.o
> diff --git a/drivers/serial/serial_litex.c b/drivers/serial/serial_litex.c
> new file mode 100644
> index 0000000000..8562a45ecc
> --- /dev/null
> +++ b/drivers/serial/serial_litex.c
> @@ -0,0 +1,96 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019 Antony Pavlov <antonynpavlov@gmail.com>
> + *
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <io.h>
> +
> +#define UART_RXTX	0x00
> +#define UART_TXFULL	0x04
> +#define UART_RXEMPTY	0x08
> +#define UART_EV_PENDING	0x10
> +#define  UART_EV_RX	(1 << 1)
> +
> +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)
> +{
> +	return !litex_serial_readb(cdev, UART_RXEMPTY);
> +}
> +
> +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);
> +
> +	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:[~2021-08-23 12:00 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17 10:10 [PATCH RESEND v4 0/8] RISC-V: add LiteX SoC support Antony Pavlov
2021-08-17 10:10 ` [PATCH RESEND v4 1/8] clocksource: timer-riscv: select CSR from device tree Antony Pavlov
2021-08-23 12:08   ` Ahmad Fatoum
2021-08-31  4:07     ` Antony Pavlov
2021-10-01 10:12       ` Ahmad Fatoum
2021-08-17 10:10 ` [PATCH RESEND v4 2/8] serial: add litex UART driver Antony Pavlov
2021-08-23 11:58   ` Ahmad Fatoum [this message]
2021-08-17 10:10 ` [PATCH RESEND v4 3/8] console: support set baudrate for fixed baudrate drivers Antony Pavlov
2021-08-23 12:01   ` Ahmad Fatoum
2021-08-17 10:11 ` [PATCH RESEND v4 4/8] gpio: add driver for 74xx-ICs with MMIO access Antony Pavlov
2021-10-01 10:13   ` Ahmad Fatoum
2021-08-17 10:11 ` [PATCH RESEND v4 5/8] spi: add litex spiflash driver Antony Pavlov
2021-08-23 11:57   ` [PATCH] fixup! " Ahmad Fatoum
2021-10-01 10:13   ` [PATCH RESEND v4 5/8] " Ahmad Fatoum
2021-08-17 10:11 ` [PATCH RESEND v4 6/8] net: add LiteEth driver Antony Pavlov
2021-10-01 10:14   ` Ahmad Fatoum
2021-08-17 10:11 ` [PATCH RESEND v4 7/8] RISC-V: add LiteX SoC and linux-on-litex-vexriscv support Antony Pavlov
2021-08-23 12:06   ` Ahmad Fatoum
2021-08-31  4:38     ` Antony Pavlov
2021-10-01 10:21       ` Ahmad Fatoum
2021-08-17 10:11 ` [PATCH RESEND v4 8/8] RISC-V: add litex_linux_defconfig Antony Pavlov
2021-10-01 10:18   ` Ahmad Fatoum
2021-10-04 12:02 ` [PATCH RESEND v4 0/8] RISC-V: add LiteX SoC support Sascha Hauer

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