[PATCH v2 0/2] add mxs application uart driver

[PATCH v2 0/2] add mxs application uart driver

[Marc Kleine-Budde]

Hello,

this series adds support for the mxs application uart driver. Lifted from TQS's
u-boot patches.

regards,
Marc

changes since v1:
- fix comments (auart_serial_getc(), auart_serial_setbaudrate())
- use auart_serial_setbaudrate

Both suggested by Sascha.


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[PATCH 1/2] driver/serial: Kconfig: explicitly state that existing mxs driver is for the debug uart

[Marc Kleine-Budde]

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/serial/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index a8be9cd..b23d17e 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -21,7 +21,7 @@ config DRIVER_SERIAL_IMX
 config DRIVER_SERIAL_STM378X
 	depends on ARCH_MXS
 	default y
-	bool "i.MX23/i.MX28 serial driver"
+	bool "i.MX23/i.MX28 debug UART serial driver"
 
 config DRIVER_SERIAL_NETX
 	depends on ARCH_NETX
-- 
1.7.10.4


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[PATCH 2/2] driver/serial: add driver for the mxs application uart

[Marc Kleine-Budde]

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/serial/Kconfig        |    4 +
 drivers/serial/Makefile       |    1 +
 drivers/serial/serial_auart.c |  238 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 243 insertions(+)
 create mode 100644 drivers/serial/serial_auart.c

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index b23d17e..00fec92 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -23,6 +23,10 @@ config DRIVER_SERIAL_STM378X
 	default y
 	bool "i.MX23/i.MX28 debug UART serial driver"
 
+config DRIVER_SERIAL_AUART
+	depends on ARCH_MXS
+	bool "i.MX23/i.MX28 application UART serial driver"
+
 config DRIVER_SERIAL_NETX
 	depends on ARCH_NETX
 	default y
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 893e282..6b90593 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_AUART)		+= serial_auart.o
diff --git a/drivers/serial/serial_auart.c b/drivers/serial/serial_auart.c
new file mode 100644
index 0000000..fa2e04f
--- /dev/null
+++ b/drivers/serial/serial_auart.c
@@ -0,0 +1,238 @@
+/*
+ * (C) 2013 Marc Kleine-Budde <mkl@pengutronix.de>
+ *
+ * Based on the stm-serial driver:
+ *
+ * (C) Copyright 2010 Juergen Beisert - Pengutronix
+ *
+ * ...also based on the u-boot auart driver:
+ *
+ * (C) 2011 Wolfgang Ocker <weo@reccoware.de>
+ *
+ * Based on the standard DUART serial driver:
+ *
+ * (C) 2007 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * (C) Copyright 2009-2010 Freescale Semiconductor, Inc.
+ *
+ * Further based on the Linux mxs-auart.c driver:
+ *
+ * Freescale STMP37XX/STMP378X Application UART driver
+ *
+ * Author: dmitry pervushin <dimka@embeddedalley.com>
+ *
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <gpio.h>
+#include <init.h>
+#include <io.h>
+#include <malloc.h>
+#include <notifier.h>
+
+#include <mach/clock.h>
+#include <mach/mxs.h>
+#include <mach/imx-regs.h>
+
+#define HW_UARTAPP_CTRL0		(0x00000000)
+
+#define HW_UARTAPP_CTRL2		(0x00000020)
+#define HW_UARTAPP_CTRL2_SET		(0x00000024)
+#define HW_UARTAPP_CTRL2_CLR		(0x00000028)
+#define BM_UARTAPP_CTRL2_CTSEN		(0x00008000)
+#define BM_UARTAPP_CTRL2_RTSEN		(0x00004000)
+#define BM_UARTAPP_CTRL2_RXE		(0x00000200)
+#define BM_UARTAPP_CTRL2_TXE		(0x00000100)
+#define BM_UARTAPP_CTRL2_USE_LCR2	(0x00000040)
+#define BM_UARTAPP_CTRL2_UARTEN		(0x00000001)
+
+#define HW_UARTAPP_LINECTRL		(0x00000030)
+#define BM_UARTAPP_LINECTRL_FEN		(0x00000010)
+
+#define BM_UARTAPP_LINECTRL_BAUD_DIVFRAC (0x00003F00)
+#define BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(v) \
+	(((v) << 8) & BM_UARTAPP_LINECTRL_BAUD_DIVFRAC)
+
+#define BP_UARTAPP_LINECTRL_BAUD_DIVINT	(16)
+#define BM_UARTAPP_LINECTRL_BAUD_DIVINT	(0xFFFF0000)
+#define BF_UARTAPP_LINECTRL_BAUD_DIVINT(v) \
+	(((v) << 16) & BM_UARTAPP_LINECTRL_BAUD_DIVINT)
+
+#define BP_UARTAPP_LINECTRL_WLEN	(5)
+#define BM_UARTAPP_LINECTRL_WLEN	(0x00000060)
+#define BF_UARTAPP_LINECTRL_WLEN(v) \
+	(((v) << 5) & BM_UARTAPP_LINECTRL_WLEN)
+
+#define HW_UARTAPP_LINECTRL2_SET	(0x00000044)
+
+#define HW_UARTAPP_INTR			(0x00000050)
+
+#define HW_UARTAPP_DATA			(0x00000060)
+#define BM_UARTAPP_STAT_RXFE		(0x01000000)
+#define BM_UARTAPP_STAT_TXFE		(0x08000000)
+
+#define HW_UARTAPP_STAT			(0x00000070)
+#define BM_UARTAPP_STAT_TXFF		(0x02000000)
+
+struct auart_priv {
+	struct console_device cdev;
+	int baudrate;
+	struct notifier_block notify;
+	void __iomem *base;
+};
+
+static void auart_serial_putc(struct console_device *cdev, char c)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Wait for room in TX FIFO */
+	while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFF)
+		;
+
+	writel(c, priv->base + HW_UARTAPP_DATA);
+}
+
+static int auart_serial_tstc(struct console_device *cdev)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Check if RX FIFO is not empty */
+	return !(readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_RXFE);
+}
+
+static int auart_serial_getc(struct console_device *cdev)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Wait while RX FIFO is empty */
+	while (!auart_serial_tstc(cdev))
+		;
+
+	return readl(priv->base + HW_UARTAPP_DATA) & 0xff;
+}
+
+static void auart_serial_flush(struct console_device *cdev)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Wait for TX FIFO empty */
+	while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFE)
+		;
+}
+
+static int auart_serial_setbaudrate(struct console_device *cdev, int new_baudrate)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+	uint32_t ctrl2, quot, reg;
+
+	/* Disable everything */
+	ctrl2 = readl(priv->base + HW_UARTAPP_CTRL2);
+	writel(0x0, priv->base + HW_UARTAPP_CTRL2);
+
+	/* Calculate and set baudrate */
+	quot = (imx_get_xclk() * 32) / new_baudrate;
+	reg = BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(quot & 0x3F) |
+		BF_UARTAPP_LINECTRL_BAUD_DIVINT(quot >> 6) |
+		BF_UARTAPP_LINECTRL_WLEN(3) |
+		BM_UARTAPP_LINECTRL_FEN;
+
+	writel(reg, priv->base + HW_UARTAPP_LINECTRL);
+
+	/* Re-enable UART */
+	writel(ctrl2, priv->base + HW_UARTAPP_CTRL2);
+
+	priv->baudrate = new_baudrate;
+
+	return 0;
+}
+
+static int auart_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data)
+{
+	struct auart_priv *priv = container_of(nb, struct auart_priv, notify);
+
+	return auart_serial_setbaudrate(&priv->cdev, priv->baudrate);
+}
+
+static void auart_serial_init_port(struct auart_priv *priv)
+{
+	mxs_reset_block(priv->base + HW_UARTAPP_CTRL0, 0);
+
+	/* Disable UART */
+	writel(0x0, priv->base + HW_UARTAPP_CTRL2);
+	/* Mask interrupts */
+	writel(0x0, priv->base + HW_UARTAPP_INTR);
+}
+
+static int auart_serial_probe(struct device_d *dev)
+{
+	struct auart_priv *priv;
+	struct console_device *cdev;
+
+	priv = xzalloc(sizeof *priv);
+	cdev = &priv->cdev;
+
+	cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+	cdev->tstc = auart_serial_tstc;
+	cdev->putc = auart_serial_putc;
+	cdev->getc = auart_serial_getc;
+	cdev->flush = auart_serial_flush;
+	cdev->setbrg = auart_serial_setbaudrate;
+	cdev->dev = dev;
+
+	dev->priv = priv;
+	priv->base = dev_request_mem_region(dev, 0);
+
+	auart_serial_init_port(priv);
+	auart_serial_setbaudrate(cdev, CONFIG_BAUDRATE);
+
+	/* Disable RTS/CTS, enable Rx, Tx, UART */
+	writel(BM_UARTAPP_CTRL2_RTSEN | BM_UARTAPP_CTRL2_CTSEN |
+	       BM_UARTAPP_CTRL2_USE_LCR2,
+	       priv->base + HW_UARTAPP_CTRL2_CLR);
+	writel(BM_UARTAPP_CTRL2_RXE | BM_UARTAPP_CTRL2_TXE |
+	       BM_UARTAPP_CTRL2_UARTEN,
+	       priv->base + HW_UARTAPP_CTRL2_SET);
+
+	console_register(cdev);
+	priv->notify.notifier_call = auart_clocksource_clock_change;
+	clock_register_client(&priv->notify);
+
+	return 0;
+}
+
+
+static void auart_serial_remove(struct device_d *dev)
+{
+	struct auart_priv *priv = dev->priv;
+
+	auart_serial_flush(&priv->cdev);
+	console_unregister(&priv->cdev);
+	free(priv);
+}
+
+static struct driver_d auart_serial_driver = {
+	.name = "auart_serial",
+	.probe = auart_serial_probe,
+	.remove = auart_serial_remove,
+};
+
+static int auart_serial_init(void)
+{
+	platform_driver_register(&auart_serial_driver);
+	return 0;
+}
+
+console_initcall(auart_serial_init);
-- 
1.7.10.4


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Re: [PATCH v2 0/2] add mxs application uart driver

[Sascha Hauer]

On Thu, Feb 28, 2013 at 05:22:08PM +0100, Marc Kleine-Budde wrote:
> Hello,
> 
> this series adds support for the mxs application uart driver. Lifted from TQS's
> u-boot patches.
> 
> regards,
> Marc
> 
> changes since v1:
> - fix comments (auart_serial_getc(), auart_serial_setbaudrate())
> - use auart_serial_setbaudrate
> 
> Both suggested by Sascha.

Applied, thanks

Sascha

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Re: [PATCH 2/2] driver/serial: add driver for the mxs application uart

[Sascha Hauer]

On Tue, Feb 26, 2013 at 07:34:50PM +0100, Marc Kleine-Budde wrote:
> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> ---
>  drivers/serial/Makefile       |    1 +
>  drivers/serial/serial_auart.c |  257 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 258 insertions(+)
>  create mode 100644 drivers/serial/serial_auart.c
> 
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index 893e282..6b90593 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_AUART)		+= serial_auart.o
> diff --git a/drivers/serial/serial_auart.c b/drivers/serial/serial_auart.c
> new file mode 100644
> index 0000000..5208a5d
> --- /dev/null
> +++ b/drivers/serial/serial_auart.c
> @@ -0,0 +1,257 @@
> +/*
> + * (C) 2013 Marc Kleine-Budde <mkl@pengutronix.de>
> + *
> + * Based on the stm-serial driver:
> + *
> + * (C) Copyright 2010 Juergen Beisert - Pengutronix
> + *
> + * ...also based on the u-boot auart driver:
> + *
> + * (C) 2011 Wolfgang Ocker <weo@reccoware.de>
> + *
> + * Based on the standard DUART serial driver:
> + *
> + * (C) 2007 Sascha Hauer <s.hauer@pengutronix.de>
> + *
> + * (C) Copyright 2009-2010 Freescale Semiconductor, Inc.
> + *
> + * Further based on the Linux mxs-auart.c driver:
> + *
> + * Freescale STMP37XX/STMP378X Application UART driver
> + *
> + * Author: dmitry pervushin <dimka@embeddedalley.com>
> + *
> + * Copyright 2008-2010 Freescale Semiconductor, Inc.
> + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
> + *
> + * 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.
> + *
> + */
> +
> +#include <common.h>
> +#include <gpio.h>
> +#include <init.h>
> +#include <io.h>
> +#include <malloc.h>
> +#include <notifier.h>
> +
> +#include <mach/clock.h>
> +#include <mach/imx-regs.h>
> +
> +#define HW_UARTAPP_CTRL0		(0x00000000)
> +#define HW_UARTAPP_CTRL0_CLR		(0x00000008)
> +#define BM_UARTAPP_CTRL0_SFTRST		(0x80000000)
> +#define BM_UARTAPP_CTRL0_CLKGATE	(0x40000000)
> +
> +#define HW_UARTAPP_CTRL2		(0x00000020)
> +#define HW_UARTAPP_CTRL2_SET		(0x00000024)
> +#define HW_UARTAPP_CTRL2_CLR		(0x00000028)
> +#define BM_UARTAPP_CTRL2_CTSEN		(0x00008000)
> +#define BM_UARTAPP_CTRL2_RTSEN		(0x00004000)
> +#define BM_UARTAPP_CTRL2_RXE		(0x00000200)
> +#define BM_UARTAPP_CTRL2_TXE		(0x00000100)
> +#define BM_UARTAPP_CTRL2_USE_LCR2	(0x00000040)
> +#define BM_UARTAPP_CTRL2_UARTEN		(0x00000001)
> +
> +#define HW_UARTAPP_LINECTRL		(0x00000030)
> +#define BM_UARTAPP_LINECTRL_FEN		(0x00000010)
> +
> +#define BM_UARTAPP_LINECTRL_BAUD_DIVFRAC (0x00003F00)
> +#define BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(v) \
> +	(((v) << 8) & BM_UARTAPP_LINECTRL_BAUD_DIVFRAC)
> +
> +#define BP_UARTAPP_LINECTRL_BAUD_DIVINT	(16)
> +#define BM_UARTAPP_LINECTRL_BAUD_DIVINT	(0xFFFF0000)
> +#define BF_UARTAPP_LINECTRL_BAUD_DIVINT(v) \
> +	(((v) << 16) & BM_UARTAPP_LINECTRL_BAUD_DIVINT)
> +
> +#define BP_UARTAPP_LINECTRL_WLEN	(5)
> +#define BM_UARTAPP_LINECTRL_WLEN	(0x00000060)
> +#define BF_UARTAPP_LINECTRL_WLEN(v) \
> +	(((v) << 5) & BM_UARTAPP_LINECTRL_WLEN)
> +
> +#define HW_UARTAPP_LINECTRL2_SET	(0x00000044)
> +
> +#define HW_UARTAPP_INTR			(0x00000050)
> +
> +#define HW_UARTAPP_DATA			(0x00000060)
> +#define BM_UARTAPP_STAT_RXFE		(0x01000000)
> +#define BM_UARTAPP_STAT_TXFE		(0x08000000)
> +
> +#define HW_UARTAPP_STAT			(0x00000070)
> +#define BM_UARTAPP_STAT_TXFF		(0x02000000)
> +
> +struct auart_priv {
> +	struct console_device cdev;
> +	int baudrate;
> +	struct notifier_block notify;
> +	void __iomem *base;
> +};
> +
> +static void auart_serial_putc(struct console_device *cdev, char c)
> +{
> +	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
> +
> +	/* Wait for room in TX FIFO */
> +	while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFF)
> +		;
> +
> +	writel(c, priv->base + HW_UARTAPP_DATA);
> +}
> +
> +static int auart_serial_tstc(struct console_device *cdev)
> +{
> +	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
> +
> +	/* Check if RX FIFO is not empty */
> +	return !(readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_RXFE);
> +}
> +
> +static int auart_serial_getc(struct console_device *cdev)
> +{
> +	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
> +
> +	/* Wait while TX FIFO is empty */

The commment seems wrong.

> +	while (!auart_serial_tstc(cdev))
> +		;
> +
> +	return readl(priv->base + HW_UARTAPP_DATA) & 0xff;
> +}
> +
> +static void auart_serial_flush(struct console_device *cdev)
> +{
> +	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
> +
> +	/* Wait for TX FIFO empty */
> +	while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFE)
> +		;
> +}
> +
> +static int auart_serial_setbaudrate(struct console_device *cdev, int new_baudrate)
> +{
> +	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
> +	uint32_t ctrl2, quot, reg;
> +
> +	/* Disable everything */
> +	ctrl2 = readl(priv->base + HW_UARTAPP_CTRL2);
> +	writel(0x0, priv->base + HW_UARTAPP_CTRL2);
> +
> +	/* Calculate and set baudrate */
> +	quot = (imx_get_xclk() * 32) / new_baudrate;
> +	reg = BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(quot & 0x3F) |
> +		BF_UARTAPP_LINECTRL_BAUD_DIVINT(quot >> 6) |
> +		BF_UARTAPP_LINECTRL_WLEN(3) |
> +		BM_UARTAPP_LINECTRL_FEN;
> +
> +	writel(reg, priv->base + HW_UARTAPP_LINECTRL);
> +
> +	/* Re-enable debug UART */

debug UART?

> +	writel(ctrl2, priv->base + HW_UARTAPP_CTRL2);
> +
> +	priv->baudrate = new_baudrate;
> +
> +	return 0;
> +}
> +
> +static int auart_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data)
> +{
> +	struct auart_priv *priv = container_of(nb, struct auart_priv, notify);
> +
> +	return auart_serial_setbaudrate(&priv->cdev, priv->baudrate);
> +}
> +
> +static void auart_reset(struct auart_priv *priv)
> +{
> +	int i;
> +
> +	writel(BM_UARTAPP_CTRL0_SFTRST, priv->base + HW_UARTAPP_CTRL0_CLR);
> +
> +	for (i = 0; i < 10000; i++) {
> +		uint32_t reg;
> +
> +		reg = readl(priv->base + HW_UARTAPP_CTRL0);
> +		if (!(reg & BM_UARTAPP_CTRL0_SFTRST))
> +			break;
> +	}
> +
> +	writel(BM_UARTAPP_CTRL0_CLKGATE, priv->base + HW_UARTAPP_CTRL0_CLR);
> +}

Can you use mxs_reset_block here?

> +
> +static void auart_serial_init_port(struct auart_priv *priv)
> +{
> +	auart_reset(priv);
> +
> +	/* Disable UART */
> +	writel(0x0, priv->base + HW_UARTAPP_CTRL2);
> +	/* Mask interrupts */
> +	writel(0x0, priv->base + HW_UARTAPP_INTR);
> +}
> +
> +static int auart_serial_probe(struct device_d *dev)
> +{
> +	struct auart_priv *priv;
> +	struct console_device *cdev;
> +
> +	priv = xzalloc(sizeof *priv);
> +	cdev = &priv->cdev;
> +
> +	cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
> +	cdev->tstc = auart_serial_tstc;
> +	cdev->putc = auart_serial_putc;
> +	cdev->getc = auart_serial_getc;
> +	cdev->flush = auart_serial_flush;
> +	cdev->setbrg = auart_serial_setbaudrate;
> +	cdev->dev = dev;
> +
> +	dev->priv = priv;
> +	priv->base = dev_request_mem_region(dev, 0);
> +
> +	auart_serial_init_port(priv);
> +	auart_serial_setbaudrate(cdev, CONFIG_BAUDRATE);
> +
> +	/* Disable RTS/CTS, enable Rx, Tx, UART */
> +	writel(BM_UARTAPP_CTRL2_RTSEN | BM_UARTAPP_CTRL2_CTSEN |
> +	       BM_UARTAPP_CTRL2_USE_LCR2,
> +	       priv->base + HW_UARTAPP_CTRL2_CLR);
> +	writel(BM_UARTAPP_CTRL2_RXE | BM_UARTAPP_CTRL2_TXE |
> +	       BM_UARTAPP_CTRL2_UARTEN,
> +	       priv->base + HW_UARTAPP_CTRL2_SET);
> +
> +	console_register(cdev);
> +	priv->notify.notifier_call = auart_clocksource_clock_change;
> +	clock_register_client(&priv->notify);
> +
> +	return 0;
> +}
> +
> +
> +static void auart_serial_remove(struct device_d *dev)
> +{
> +	struct auart_priv *priv = dev->priv;
> +
> +	auart_serial_flush(&priv->cdev);
> +	console_unregister(&priv->cdev);
> +	free(priv);
> +}
> +
> +static struct driver_d auart_serial_driver = {
> +	.name = "auart_serial",
> +	.probe = auart_serial_probe,
> +	.remove = auart_serial_remove,
> +};
> +
> +static int auart_serial_init(void)
> +{
> +	platform_driver_register(&auart_serial_driver);
> +	return 0;

return platform_driver_register please.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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[PATCH 2/2] driver/serial: add driver for the mxs application uart

[Marc Kleine-Budde]

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/serial/Makefile       |    1 +
 drivers/serial/serial_auart.c |  257 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 258 insertions(+)
 create mode 100644 drivers/serial/serial_auart.c

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 893e282..6b90593 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_AUART)		+= serial_auart.o
diff --git a/drivers/serial/serial_auart.c b/drivers/serial/serial_auart.c
new file mode 100644
index 0000000..5208a5d
--- /dev/null
+++ b/drivers/serial/serial_auart.c
@@ -0,0 +1,257 @@
+/*
+ * (C) 2013 Marc Kleine-Budde <mkl@pengutronix.de>
+ *
+ * Based on the stm-serial driver:
+ *
+ * (C) Copyright 2010 Juergen Beisert - Pengutronix
+ *
+ * ...also based on the u-boot auart driver:
+ *
+ * (C) 2011 Wolfgang Ocker <weo@reccoware.de>
+ *
+ * Based on the standard DUART serial driver:
+ *
+ * (C) 2007 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * (C) Copyright 2009-2010 Freescale Semiconductor, Inc.
+ *
+ * Further based on the Linux mxs-auart.c driver:
+ *
+ * Freescale STMP37XX/STMP378X Application UART driver
+ *
+ * Author: dmitry pervushin <dimka@embeddedalley.com>
+ *
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <gpio.h>
+#include <init.h>
+#include <io.h>
+#include <malloc.h>
+#include <notifier.h>
+
+#include <mach/clock.h>
+#include <mach/imx-regs.h>
+
+#define HW_UARTAPP_CTRL0		(0x00000000)
+#define HW_UARTAPP_CTRL0_CLR		(0x00000008)
+#define BM_UARTAPP_CTRL0_SFTRST		(0x80000000)
+#define BM_UARTAPP_CTRL0_CLKGATE	(0x40000000)
+
+#define HW_UARTAPP_CTRL2		(0x00000020)
+#define HW_UARTAPP_CTRL2_SET		(0x00000024)
+#define HW_UARTAPP_CTRL2_CLR		(0x00000028)
+#define BM_UARTAPP_CTRL2_CTSEN		(0x00008000)
+#define BM_UARTAPP_CTRL2_RTSEN		(0x00004000)
+#define BM_UARTAPP_CTRL2_RXE		(0x00000200)
+#define BM_UARTAPP_CTRL2_TXE		(0x00000100)
+#define BM_UARTAPP_CTRL2_USE_LCR2	(0x00000040)
+#define BM_UARTAPP_CTRL2_UARTEN		(0x00000001)
+
+#define HW_UARTAPP_LINECTRL		(0x00000030)
+#define BM_UARTAPP_LINECTRL_FEN		(0x00000010)
+
+#define BM_UARTAPP_LINECTRL_BAUD_DIVFRAC (0x00003F00)
+#define BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(v) \
+	(((v) << 8) & BM_UARTAPP_LINECTRL_BAUD_DIVFRAC)
+
+#define BP_UARTAPP_LINECTRL_BAUD_DIVINT	(16)
+#define BM_UARTAPP_LINECTRL_BAUD_DIVINT	(0xFFFF0000)
+#define BF_UARTAPP_LINECTRL_BAUD_DIVINT(v) \
+	(((v) << 16) & BM_UARTAPP_LINECTRL_BAUD_DIVINT)
+
+#define BP_UARTAPP_LINECTRL_WLEN	(5)
+#define BM_UARTAPP_LINECTRL_WLEN	(0x00000060)
+#define BF_UARTAPP_LINECTRL_WLEN(v) \
+	(((v) << 5) & BM_UARTAPP_LINECTRL_WLEN)
+
+#define HW_UARTAPP_LINECTRL2_SET	(0x00000044)
+
+#define HW_UARTAPP_INTR			(0x00000050)
+
+#define HW_UARTAPP_DATA			(0x00000060)
+#define BM_UARTAPP_STAT_RXFE		(0x01000000)
+#define BM_UARTAPP_STAT_TXFE		(0x08000000)
+
+#define HW_UARTAPP_STAT			(0x00000070)
+#define BM_UARTAPP_STAT_TXFF		(0x02000000)
+
+struct auart_priv {
+	struct console_device cdev;
+	int baudrate;
+	struct notifier_block notify;
+	void __iomem *base;
+};
+
+static void auart_serial_putc(struct console_device *cdev, char c)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Wait for room in TX FIFO */
+	while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFF)
+		;
+
+	writel(c, priv->base + HW_UARTAPP_DATA);
+}
+
+static int auart_serial_tstc(struct console_device *cdev)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Check if RX FIFO is not empty */
+	return !(readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_RXFE);
+}
+
+static int auart_serial_getc(struct console_device *cdev)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Wait while TX FIFO is empty */
+	while (!auart_serial_tstc(cdev))
+		;
+
+	return readl(priv->base + HW_UARTAPP_DATA) & 0xff;
+}
+
+static void auart_serial_flush(struct console_device *cdev)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+
+	/* Wait for TX FIFO empty */
+	while (readl(priv->base + HW_UARTAPP_STAT) & BM_UARTAPP_STAT_TXFE)
+		;
+}
+
+static int auart_serial_setbaudrate(struct console_device *cdev, int new_baudrate)
+{
+	struct auart_priv *priv = container_of(cdev, struct auart_priv, cdev);
+	uint32_t ctrl2, quot, reg;
+
+	/* Disable everything */
+	ctrl2 = readl(priv->base + HW_UARTAPP_CTRL2);
+	writel(0x0, priv->base + HW_UARTAPP_CTRL2);
+
+	/* Calculate and set baudrate */
+	quot = (imx_get_xclk() * 32) / new_baudrate;
+	reg = BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(quot & 0x3F) |
+		BF_UARTAPP_LINECTRL_BAUD_DIVINT(quot >> 6) |
+		BF_UARTAPP_LINECTRL_WLEN(3) |
+		BM_UARTAPP_LINECTRL_FEN;
+
+	writel(reg, priv->base + HW_UARTAPP_LINECTRL);
+
+	/* Re-enable debug UART */
+	writel(ctrl2, priv->base + HW_UARTAPP_CTRL2);
+
+	priv->baudrate = new_baudrate;
+
+	return 0;
+}
+
+static int auart_clocksource_clock_change(struct notifier_block *nb, unsigned long event, void *data)
+{
+	struct auart_priv *priv = container_of(nb, struct auart_priv, notify);
+
+	return auart_serial_setbaudrate(&priv->cdev, priv->baudrate);
+}
+
+static void auart_reset(struct auart_priv *priv)
+{
+	int i;
+
+	writel(BM_UARTAPP_CTRL0_SFTRST, priv->base + HW_UARTAPP_CTRL0_CLR);
+
+	for (i = 0; i < 10000; i++) {
+		uint32_t reg;
+
+		reg = readl(priv->base + HW_UARTAPP_CTRL0);
+		if (!(reg & BM_UARTAPP_CTRL0_SFTRST))
+			break;
+	}
+
+	writel(BM_UARTAPP_CTRL0_CLKGATE, priv->base + HW_UARTAPP_CTRL0_CLR);
+}
+
+static void auart_serial_init_port(struct auart_priv *priv)
+{
+	auart_reset(priv);
+
+	/* Disable UART */
+	writel(0x0, priv->base + HW_UARTAPP_CTRL2);
+	/* Mask interrupts */
+	writel(0x0, priv->base + HW_UARTAPP_INTR);
+}
+
+static int auart_serial_probe(struct device_d *dev)
+{
+	struct auart_priv *priv;
+	struct console_device *cdev;
+
+	priv = xzalloc(sizeof *priv);
+	cdev = &priv->cdev;
+
+	cdev->f_caps = CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR;
+	cdev->tstc = auart_serial_tstc;
+	cdev->putc = auart_serial_putc;
+	cdev->getc = auart_serial_getc;
+	cdev->flush = auart_serial_flush;
+	cdev->setbrg = auart_serial_setbaudrate;
+	cdev->dev = dev;
+
+	dev->priv = priv;
+	priv->base = dev_request_mem_region(dev, 0);
+
+	auart_serial_init_port(priv);
+	auart_serial_setbaudrate(cdev, CONFIG_BAUDRATE);
+
+	/* Disable RTS/CTS, enable Rx, Tx, UART */
+	writel(BM_UARTAPP_CTRL2_RTSEN | BM_UARTAPP_CTRL2_CTSEN |
+	       BM_UARTAPP_CTRL2_USE_LCR2,
+	       priv->base + HW_UARTAPP_CTRL2_CLR);
+	writel(BM_UARTAPP_CTRL2_RXE | BM_UARTAPP_CTRL2_TXE |
+	       BM_UARTAPP_CTRL2_UARTEN,
+	       priv->base + HW_UARTAPP_CTRL2_SET);
+
+	console_register(cdev);
+	priv->notify.notifier_call = auart_clocksource_clock_change;
+	clock_register_client(&priv->notify);
+
+	return 0;
+}
+
+
+static void auart_serial_remove(struct device_d *dev)
+{
+	struct auart_priv *priv = dev->priv;
+
+	auart_serial_flush(&priv->cdev);
+	console_unregister(&priv->cdev);
+	free(priv);
+}
+
+static struct driver_d auart_serial_driver = {
+	.name = "auart_serial",
+	.probe = auart_serial_probe,
+	.remove = auart_serial_remove,
+};
+
+static int auart_serial_init(void)
+{
+	platform_driver_register(&auart_serial_driver);
+	return 0;
+}
+
+console_initcall(auart_serial_init);
-- 
1.7.10.4


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