[U-Boot] [PATCH 1/3] serial: uartlite: Move driver to DM

Thomas Chou thomas at wytron.com.tw
Mon Dec 14 15:47:57 CET 2015 

Hi Michal,

On 2015年12月11日 19:54, Michal Simek wrote:
> Enable SPL DM too.
>
> Signed-off-by: Michal Simek <michal.simek at xilinx.com>
> ---
>
>   arch/microblaze/Kconfig              |   1 +
>   configs/microblaze-generic_defconfig |   2 +
>   doc/driver-model/serial-howto.txt    |   1 -
>   drivers/serial/serial_xuartlite.c    | 176 ++++++++++++++---------------------
>   4 files changed, 71 insertions(+), 109 deletions(-)
>
> diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
> index 604f6815af5b..30ea484f48aa 100644
> --- a/arch/microblaze/Kconfig
> +++ b/arch/microblaze/Kconfig
> @@ -13,6 +13,7 @@ config TARGET_MICROBLAZE_GENERIC
>   	select SUPPORT_SPL
>   	select OF_CONTROL
>   	select DM
> +	select DM_SERIAL
>
>   endchoice
>
> diff --git a/configs/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
> index 54aa3ef3d26f..5df080b6a87c 100644
> --- a/configs/microblaze-generic_defconfig
> +++ b/configs/microblaze-generic_defconfig
> @@ -1,9 +1,11 @@
>   CONFIG_MICROBLAZE=y
>   CONFIG_SPL_SYS_MALLOC_SIMPLE=y
> +CONFIG_SPL_DM=y
>   CONFIG_TARGET_MICROBLAZE_GENERIC=y
>   CONFIG_DEFAULT_DEVICE_TREE="microblaze-generic"
>   CONFIG_SPL=y
>   CONFIG_SYS_PROMPT="U-Boot-mONStR> "
>   CONFIG_CMD_GPIO=y
>   # CONFIG_CMD_SETEXPR is not set
> +CONFIG_SPL_OF_CONTROL=y
>   CONFIG_OF_EMBED=y
> diff --git a/doc/driver-model/serial-howto.txt b/doc/driver-model/serial-howto.txt
> index 60483a4c49bc..6688abc4d9e3 100644
> --- a/doc/driver-model/serial-howto.txt
> +++ b/doc/driver-model/serial-howto.txt
> @@ -19,7 +19,6 @@ is time for maintainers to start converting over the remaining serial drivers:
>      serial_s3c24x0.c
>      serial_sa1100.c
>      serial_stm32.c
> -   serial_xuartlite.c
>      usbtty.c
>
>   You should complete this by the end of January 2016.
> diff --git a/drivers/serial/serial_xuartlite.c b/drivers/serial/serial_xuartlite.c
> index 988438e75471..10089f5a34b5 100644
> --- a/drivers/serial/serial_xuartlite.c
> +++ b/drivers/serial/serial_xuartlite.c
> @@ -1,5 +1,5 @@
>   /*
> - * (C) Copyright 2008-2011 Michal Simek <monstr at monstr.eu>
> + * (C) Copyright 2008 - 2015 Michal Simek <monstr at monstr.eu>
>    * Clean driver and add xilinx constant from header file
>    *
>    * (C) Copyright 2004 Atmark Techno, Inc.
> @@ -10,11 +10,17 @@
>
>   #include <config.h>
>   #include <common.h>
> +#include <debug_uart.h>

Move to debug uart section.

> +#include <dm.h>
>   #include <asm/io.h>
>   #include <linux/compiler.h>
>   #include <serial.h>
> +#include <watchdog.h>

watchdog.h is not needed.

> +
> +DECLARE_GLOBAL_DATA_PTR;
>
>   #define SR_TX_FIFO_FULL		0x08 /* transmit FIFO full */
> +#define SR_TX_FIFO_EMPTY	0x04 /* transmit FIFO empty */
>   #define SR_RX_FIFO_VALID_DATA	0x01 /* data in receive FIFO */
>   #define SR_RX_FIFO_FULL		0x02 /* receive FIFO full */
>
> @@ -28,135 +34,89 @@ struct uartlite {
>   	unsigned int control;
>   };
>
> -static struct uartlite *userial_ports[4] = {
> -#ifdef XILINX_UARTLITE_BASEADDR
> -	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
> -#endif
> -#ifdef XILINX_UARTLITE_BASEADDR1
> -	[1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
> -#endif
> -#ifdef XILINX_UARTLITE_BASEADDR2
> -	[2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
> -#endif
> -#ifdef XILINX_UARTLITE_BASEADDR3
> -	[3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
> -#endif
> +struct uartlite_priv {
> +	struct uartlite *regs;
>   };
>
> -static void uartlite_serial_putc(const char c, const int port)
> +static int uartlite_serial_putc(struct udevice *dev, const char ch)
>   {
> -	struct uartlite *regs = userial_ports[port];
> +	struct uartlite_priv *priv = dev_get_priv(dev);
> +	struct uartlite *regs = priv->regs;
>
> -	if (c == '\n')
> -		uartlite_serial_putc('\r', port);
> +	if (in_be32(&regs->status) & SR_TX_FIFO_FULL)
> +		return -EAGAIN;
>
> -	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
> -		;
> -	out_be32(&regs->tx_fifo, c & 0xff);
> -}
> +	out_be32(&regs->tx_fifo, ch & 0xff);
>
> -static void uartlite_serial_puts(const char *s, const int port)
> -{
> -	while (*s)
> -		uartlite_serial_putc(*s++, port);
> +	return 0;
>   }
>
> -static int uartlite_serial_getc(const int port)
> +static int uartlite_serial_getc(struct udevice *dev)
>   {
> -	struct uartlite *regs = userial_ports[port];
> +	struct uartlite_priv *priv = dev_get_priv(dev);
> +	struct uartlite *regs = priv->regs;
> +
> +	if (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
> +		return -EAGAIN;
>
> -	while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
> -		;
>   	return in_be32(&regs->rx_fifo) & 0xff;
>   }
>
> -static int uartlite_serial_tstc(const int port)
> +static int uartlite_serial_pending(struct udevice *dev, bool input)
>   {
> -	struct uartlite *regs = userial_ports[port];
> +	struct uartlite_priv *priv = dev_get_priv(dev);
> +	struct uartlite *regs = priv->regs;
> +
> +	if (input)
> +		return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
>
> -	return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
> +	return in_be32(&regs->status) & SR_TX_FIFO_EMPTY;
>   }
>
> -static int uartlite_serial_init(const int port)
> +static int uartlite_serial_probe(struct udevice *dev)
>   {
> -	struct uartlite *regs = userial_ports[port];
> +	struct uartlite_priv *priv = dev_get_priv(dev);
> +	struct uartlite *regs = priv->regs;
>
> -	if (regs) {
> -		out_be32(&regs->control, 0);
> -		out_be32(&regs->control,
> -			 ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
> -		in_be32(&regs->control);
> -		return 0;
> -	}
> +	out_be32(&regs->control, 0);
> +	out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
> +	in_be32(&regs->control);
>
> -	return -1;
> +	return 0;
>   }
>
> -/* Multi serial device functions */
> -#define DECLARE_ESERIAL_FUNCTIONS(port) \
> -	static int userial##port##_init(void) \
> -				{ return uartlite_serial_init(port); } \
> -	static void userial##port##_setbrg(void) {} \
> -	static int userial##port##_getc(void) \
> -				{ return uartlite_serial_getc(port); } \
> -	static int userial##port##_tstc(void) \
> -				{ return uartlite_serial_tstc(port); } \
> -	static void userial##port##_putc(const char c) \
> -				{ uartlite_serial_putc(c, port); } \
> -	static void userial##port##_puts(const char *s) \
> -				{ uartlite_serial_puts(s, port); }
> -
> -/* Serial device descriptor */
> -#define INIT_ESERIAL_STRUCTURE(port, __name) {	\
> -	.name	= __name,			\
> -	.start	= userial##port##_init,		\
> -	.stop	= NULL,				\
> -	.setbrg	= userial##port##_setbrg,	\
> -	.getc	= userial##port##_getc,		\
> -	.tstc	= userial##port##_tstc,		\
> -	.putc	= userial##port##_putc,		\
> -	.puts	= userial##port##_puts,		\
> -}
> -
> -DECLARE_ESERIAL_FUNCTIONS(0);
> -struct serial_device uartlite_serial0_device =
> -	INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
> -DECLARE_ESERIAL_FUNCTIONS(1);
> -struct serial_device uartlite_serial1_device =
> -	INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
> -DECLARE_ESERIAL_FUNCTIONS(2);
> -struct serial_device uartlite_serial2_device =
> -	INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
> -DECLARE_ESERIAL_FUNCTIONS(3);
> -struct serial_device uartlite_serial3_device =
> -	INIT_ESERIAL_STRUCTURE(3, "ttyUL3");
> -
> -__weak struct serial_device *default_serial_console(void)
> +static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
>   {
> -	if (userial_ports[0])
> -		return &uartlite_serial0_device;
> -	if (userial_ports[1])
> -		return &uartlite_serial1_device;
> -	if (userial_ports[2])
> -		return &uartlite_serial2_device;
> -	if (userial_ports[3])
> -		return &uartlite_serial3_device;
> -
> -	return NULL;
> -}
> +	struct uartlite_priv *priv = dev_get_priv(dev);

Since the conversion is "ofdatta to platdata", this should be platdata 
rather than priv. If there is not variable part, you may simply use 
platdata in the ops. In some cases, you may add device from platdata 
without ofdata.

> +	fdt_addr_t addr;
>
> -void uartlite_serial_initialize(void)
> -{
> -#ifdef XILINX_UARTLITE_BASEADDR
> -	serial_register(&uartlite_serial0_device);
> -#endif /* XILINX_UARTLITE_BASEADDR */
> -#ifdef XILINX_UARTLITE_BASEADDR1
> -	serial_register(&uartlite_serial1_device);
> -#endif /* XILINX_UARTLITE_BASEADDR1 */
> -#ifdef XILINX_UARTLITE_BASEADDR2
> -	serial_register(&uartlite_serial2_device);
> -#endif /* XILINX_UARTLITE_BASEADDR2 */
> -#ifdef XILINX_UARTLITE_BASEADDR3
> -	serial_register(&uartlite_serial3_device);
> -#endif /* XILINX_UARTLITE_BASEADDR3 */
> +	addr = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");

Use dev_get_addr() is preferred.

> +	if (addr == FDT_ADDR_T_NONE)
> +		return -EINVAL;
> +
> +	priv->regs = (struct uartlite *)addr;
> +
> +	return 0;
>   }
> +
> +static const struct dm_serial_ops uartlite_serial_ops = {
> +	.putc = uartlite_serial_putc,
> +	.pending = uartlite_serial_pending,
> +	.getc = uartlite_serial_getc,
> +};
> +
> +static const struct udevice_id uartlite_serial_ids[] = {
> +	{ .compatible = "xlnx,xps-uartlite-1.00.a" },
> +	{ }
> +};
> +

Please add binding to doc/device-tree-bindings/serial/ .

> +U_BOOT_DRIVER(serial_uartlite) = {
> +	.name	= "serial_uartlite",
> +	.id	= UCLASS_SERIAL,
> +	.of_match = uartlite_serial_ids,
> +	.ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
> +	.priv_auto_alloc_size = sizeof(struct uartlite_priv),

maybe platdata.

> +	.probe = uartlite_serial_probe,
> +	.ops	= &uartlite_serial_ops,
> +	.flags = DM_FLAG_PRE_RELOC,
> +};
>

Thanks.

Best regards,
Thomas

More information about the U-Boot mailing list