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@xxxxxxxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxxxxxxxx>
> + *
> + * 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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