On 18:48 Sat 02 Mar , Josh Cartwright wrote: > > 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); do;nt do so otherwise the kernel will have no uart for decompress and earlyprintk > +} > + > +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 > > > > _______________________________________________ > barebox mailing list > [email protected] > http://lists.infradead.org/mailman/listinfo/barebox
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