Hi,
On 07.05.21 00:08, Antony Pavlov wrote:
> Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
> ---
> 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@xxxxxxxxx>
> + *
> + */
> +
> +#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;
Does the IP only output a fixed baudrate/configuration?
> +
> + 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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