linux-kernel - Re: [PATCH 4/8] ARM: mvebu: Add USB3 UTMI support

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Date:	Fri, 18 Apr 2014 13:19:41 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 4/8] ARM: mvebu: Add USB3 UTMI support

On 04/18/2014 12:22 PM, Gregory CLEMENT wrote:
> The usb3-utmi registers allow to configure the internal USB PHY of the
> Armada 380/385 SoCs. A small initialization is needed to be able to use
> the USB3 ports.
> 
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  arch/arm/mach-mvebu/Makefile   |  2 +-
>  arch/arm/mach-mvebu/usb-utmi.c | 64 ++++++++++++++++++++++++++++++++++++++++++

Gregory,

there is the generic PHY framework, that could possibly be used to
avoid adding more code to arch/arm/mach-mvebu.

>  2 files changed, 65 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/mach-mvebu/usb-utmi.c
> 
> diff --git a/arch/arm/mach-mvebu/Makefile b/arch/arm/mach-mvebu/Makefile
> index a63e43b6b451..2d98a3eeecf6 100644
> --- a/arch/arm/mach-mvebu/Makefile
> +++ b/arch/arm/mach-mvebu/Makefile
> @@ -4,7 +4,7 @@ ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/$(src)/include \
>  AFLAGS_coherency_ll.o		:= -Wa,-march=armv7-a
>  
>  obj-y				 += system-controller.o mvebu-soc-id.o
> -obj-$(CONFIG_MACH_MVEBU_V7)      += board-v7.o
> +obj-$(CONFIG_MACH_MVEBU_V7)      += board-v7.o  usb-utmi.o
>  obj-$(CONFIG_MACH_DOVE)		 += dove.o
>  obj-$(CONFIG_ARCH_MVEBU)	 += coherency.o coherency_ll.o pmsu.o
>  obj-$(CONFIG_SMP)                += platsmp.o headsmp.o
> diff --git a/arch/arm/mach-mvebu/usb-utmi.c b/arch/arm/mach-mvebu/usb-utmi.c
> new file mode 100644
> index 000000000000..e91e86f85eb4
> --- /dev/null
> +++ b/arch/arm/mach-mvebu/usb-utmi.c
> @@ -0,0 +1,64 @@
> +/*
> + * USB UTMI support for Armada 38x platform.
> + *
> + * Copyright (C) 2014 Marvell
> + *
> + * Gregory CLEMENT <gregory.clement@...e-electrons.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2.  This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/of_address.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>

nit: sort alphabetically

> +#define USB_UTMI_PHY_CTRL_STATUS(i)	(0x20+i*4)
> +#define		USB_UTMI_TX_BITSTUFF_EN BIT(1)
> +#define		USB_UTMI_PU_PHY		BIT(5)
> +#define		USB_UTMI_VBUS_ON_PHY	BIT(6)

nit: two TABs in front of the defines above.

> +static struct of_device_id of_usb_utmi_table[] = {
> +	{ .compatible = "marvell,armada-380-usb-utmi", },
> +	{ /* end of list */ },
> +};
> +
> +static int __init mvebu_usb_utmi_init(void)
> +{
> +	struct device_node *np;
> +
> +	np = of_find_matching_node(NULL, of_usb_utmi_table);
> +	if (np) {
> +		void __iomem *usb_utmi_base, *utmi_base;
> +
> +		usb_utmi_base = of_iomap(np, 0);
> +		BUG_ON(!usb_utmi_base);
> +
> +		utmi_base = of_iomap(np, 1);
> +		BUG_ON(!utmi_base);
> +
> +		writel(USB_UTMI_TX_BITSTUFF_EN |
> +			   USB_UTMI_PU_PHY |
> +			   USB_UTMI_VBUS_ON_PHY,
> +			   usb_utmi_base + USB_UTMI_PHY_CTRL_STATUS(0));
> +
> +		/*
> +		 * Magic init... the registers and their value are not
> +		 * documented
> +		 */
> +		writel(0x40605205, utmi_base);
> +		writel(0x409, utmi_base + 4);
> +		writel(0x1be7f6f, utmi_base + 0xc);

nit: decimal/hexadecimal offsets, also IMHO filling the values
written with leading zeros improves readability of "magic init"
alot :)

Sebastian

> +
> +		of_node_put(np);
> +		iounmap(utmi_base);
> +		iounmap(usb_utmi_base);
> +	}
> +
> +	return 0;
> +}
> +postcore_initcall(mvebu_usb_utmi_init);
> 

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