From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH v2 05/11] serial: add litex UART driver
Date: Fri, 7 May 2021 01:08:28 +0300 [thread overview]
Message-ID: <20210506220834.223350-6-antonynpavlov@gmail.com> (raw)
In-Reply-To: <20210506220834.223350-1-antonynpavlov@gmail.com>
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 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);
--
2.31.1
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next prev parent reply other threads:[~2021-05-06 22:10 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-06 22:08 [PATCH v2 00/11] RISC-V: add LiteX SoC support; resurrect nmon Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 01/11] clocksource: timer-riscv: select CSR from device tree Antony Pavlov
2021-05-07 11:34 ` Ahmad Fatoum
2021-05-07 17:41 ` Antony Pavlov
2021-05-07 18:05 ` Ahmad Fatoum
2021-05-06 22:08 ` [PATCH v2 02/11] RISC-V: make RISCV_SBI and RISCV_M_MODE explicitly mutually exclusive Antony Pavlov
2021-05-07 11:42 ` Ahmad Fatoum
2021-05-07 14:25 ` Antony Pavlov
2021-05-07 14:44 ` Ahmad Fatoum
2021-05-07 17:52 ` Antony Pavlov
2021-05-07 18:08 ` Ahmad Fatoum
2021-05-07 18:36 ` Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 03/11] RISC-V: make it possible to run nmon from PBL C code Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 04/11] RISC-V: boards: erizo: make it possible to use nmon Antony Pavlov
2021-05-06 22:08 ` Antony Pavlov [this message]
2021-05-07 11:45 ` [PATCH v2 05/11] serial: add litex UART driver Ahmad Fatoum
2021-05-07 12:02 ` Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 06/11] gpio: add driver for 74xx-ICs with MMIO access Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 07/11] spi: add litex spiflash driver Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 08/11] net: add LiteEth driver Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 09/11] RISC-V: add LiteX SoC and linux-on-litex-vexriscv support Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 10/11] RISC-V: add litex_linux_defconfig Antony Pavlov
2021-05-06 22:08 ` [PATCH v2 11/11] RISC-V: make it possible to build RV32I multi-image with DEBUG_LL=n Antony Pavlov
2021-05-07 10:27 ` Ahmad Fatoum
2021-05-07 10:23 ` [PATCH v2 00/11] RISC-V: add LiteX SoC support; resurrect nmon Ahmad Fatoum
2021-05-07 11:12 ` Antony Pavlov
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