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[109.252.203.80]) by smtp.gmail.com with ESMTPSA id e20sm179795ljn.13.2021.08.17.03.04.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 03:04:49 -0700 (PDT) From: Antony Pavlov To: barebox@lists.infradead.org Date: Tue, 17 Aug 2021 13:04:29 +0300 Message-Id: <20210817100435.114756-3-antonynpavlov@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210817100435.114756-1-antonynpavlov@gmail.com> References: <20210817100435.114756-1-antonynpavlov@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210817_030452_391370_7B293375 X-CRM114-Status: GOOD ( 16.16 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ahmad Fatoum Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:e::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.2 required=4.0 tests=AWL,BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 2/8] serial: add litex UART driver X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) Signed-off-by: Antony Pavlov --- 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 + * + */ + +#include +#include +#include + +#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); -- 2.32.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox