Simple UART driver for Zynq SoCs, based loosely on the u-boot driver.
Signed-off-by: Josh Cartwright <[email protected]>
---
drivers/serial/Kconfig | 6 ++
drivers/serial/Makefile | 1 +
drivers/serial/serial_zynq.c | 144 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 151 insertions(+)
create mode 100644 drivers/serial/serial_zynq.c
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index f61d670..608b616 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -113,4 +113,10 @@ config DRIVER_SERIAL_OMAP4_USBBOOT
help
Enable this to get console support over the usb bus used to boot an
OMAP4
+config DRIVER_SERIAL_ZYNQ
+ bool "driver for Zynq uarts"
+ default n
+ help
+ Say Y here to get console out support with the Zynq uarts
+
endmenu
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 893e282..883394f 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_DRIVER_SERIAL_ALTERA) +=
serial_altera.o
obj-$(CONFIG_DRIVER_SERIAL_ALTERA_JTAG) += serial_altera_jtag.o
obj-$(CONFIG_DRIVER_SERIAL_PXA) += serial_pxa.o
obj-$(CONFIG_DRIVER_SERIAL_OMAP4_USBBOOT) += serial_omap4_usbboot.o
+obj-$(CONFIG_DRIVER_SERIAL_ZYNQ) += serial_zynq.o
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
new file mode 100644
index 0000000..ec93b58
--- /dev/null
+++ b/drivers/serial/serial_zynq.c
@@ -0,0 +1,144 @@
+/*
+ * (C) Copyright 2013 Josh Cartwright
+ *
+ * Based very loosely on u-boot drivers/serial/serial_zynq.c.
+ *
+ * Copyright (C) 2012 Michal Simek <[email protected]>
+ * Copyright (C) 2011-2012 Xilinx, Inc. All rights reserved.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <io.h>
+#include <init.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <console.h>
+#include <malloc.h>
+
+#include <linux/clk.h>
+
+#define UART_CR 0x00000000
+#define UART_CR_TXEN (1<<4)
+#define UART_CR_RXEN (1<<2)
+#define UART_CR_TXRST (1<<1)
+#define UART_CR_RXRST (1<<0)
+
+#define UART_SR 0x0000002C
+#define UART_SR_TXFULL (1<<4)
+#define UART_SR_TXEMPTY (1<<3)
+#define UART_SR_RXFULL (1<<2)
+#define UART_SR_RXEMPTY (1<<1)
+
+#define UART_FIFO 0x00000030
+
+struct zynq_serial_device {
+ struct console_device cdev;
+ struct clk *clk;
+ void __iomem *regs;
+};
+
+#define to_zynq_device(p) container_of(p, struct zynq_serial_device, cdev)
+
+static void zynq_serial_init_device(struct zynq_serial_device *dev)
+{
+ writel(UART_CR_TXEN | UART_CR_RXEN | UART_CR_TXEN | UART_CR_RXEN,
+ dev->regs + UART_CR);
+}
+
+static int zynq_serial_tstc(struct console_device *cdev)
+{
+ struct zynq_serial_device *zynq = to_zynq_device(cdev);
+
+ return !(readl(zynq->regs + UART_SR) & UART_SR_RXEMPTY);
+}
+
+static void zynq_serial_putc(struct console_device *cdev, char c)
+{
+ struct zynq_serial_device *zynq = to_zynq_device(cdev);
+
+ while (readl(zynq->regs + UART_SR) & UART_SR_TXFULL);
+
+ writel(c, zynq->regs + UART_FIFO);
+}
+
+static int zynq_serial_getc(struct console_device *cdev)
+{
+ struct zynq_serial_device *zynq = to_zynq_device(cdev);
+
+ return readl(zynq->regs + UART_FIFO);
+}
+
+static void zynq_serial_flush(struct console_device *cdev)
+{
+ struct zynq_serial_device *zynq = to_zynq_device(cdev);
+
+ while (!(readl(zynq->regs + UART_SR) & UART_SR_TXEMPTY));
+}
+
+static int zynq_serial_probe(struct device_d *dev)
+{
+ struct zynq_serial_device *priv;
+ struct console_device *cdev;
+ int err;
+
+ priv = xzalloc(sizeof(*priv));
+ cdev = &priv->cdev;
+
+ priv->regs = dev_request_mem_region(dev, 0);
+ cdev->dev = dev;
+ cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+ cdev->tstc = zynq_serial_tstc;
+ cdev->putc = zynq_serial_putc;
+ cdev->getc = zynq_serial_getc;
+ cdev->flush = zynq_serial_flush;
+
+ priv->clk = clk_get(dev, NULL);
+
+ err = clk_enable(priv->clk);
+ if (err) {
+ free(priv);
+ return err;
+ }
+
+ zynq_serial_init_device(priv);
+
+ dev->priv = priv;
+
+ return console_register(cdev);
+}
+
+static void zynq_serial_remove(struct device_d *dev)
+{
+ struct zynq_serial_device *zynq = dev->priv;
+ clk_disable(zynq->clk);
+ free(zynq);
+}
+
+static struct driver_d zynq_serial_driver = {
+ .name = "zynq_serial",
+ .probe = zynq_serial_probe,
+ .remove = zynq_serial_remove,
+};
+
+static int zynq_serial_init(void)
+{
+ return platform_driver_register(&zynq_serial_driver);
+}
+console_initcall(zynq_serial_init);
--
1.8.1.2
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