linux-kernel - Re: [PATCH v4 1/3] usb: orion-echi: Add support for the Armada 3700

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Message-ID: <Pine.LNX.4.44L0.1703091318010.1560-100000@iolanthe.rowland.org>
Date:   Thu, 9 Mar 2017 13:18:27 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Gregory CLEMENT <gregory.clement@...e-electrons.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Nadav Haklai <nadavh@...vell.com>,
        Victor Gu <xigu@...vell.com>, Marcin Wojtas <mw@...ihalf.com>,
        Wilson Ding <dingwei@...vell.com>,
        Hua Jing <jinghua@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>
Subject: Re: [PATCH v4 1/3] usb: orion-echi: Add support for the Armada 3700

On Thu, 9 Mar 2017, Gregory CLEMENT wrote:

> From: Hua Jing <jinghua@...vell.com>
> 
> - Add a new compatible string for the Armada 3700 SoCs
> 
> - add sbuscfg support for orion usb controller driver. For the SoCs
>   without hlock, need to program BAWR/BARD/AHBBRST fields in the sbuscfg
>   register to guarantee the AHB master's burst would not overrun or
>   underrun the FIFO.
> 
> - the sbuscfg register has to be set after the usb controller reset,
>   otherwise the value would be overridden to 0. In order to do this, the
>   reset callback is registered.
> 
> [gregory.clement@...e-electrons.com: - reword commit and comments
> 				     - fix error path in ehci_orion_drv_reset()
> 				     - fix checkpatch warning]
> Signed-off-by: Hua Jing <jinghua@...vell.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

Acked-by: Alan Stern <stern@...land.harvard.edu>

> ---
>  .../devicetree/bindings/usb/ehci-orion.txt         |  4 ++-
>  drivers/usb/host/ehci-orion.c                      | 36 ++++++++++++++++++++++
>  2 files changed, 39 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/ehci-orion.txt b/Documentation/devicetree/bindings/usb/ehci-orion.txt
> index 17c3bc858b86..2855bae79fda 100644
> --- a/Documentation/devicetree/bindings/usb/ehci-orion.txt
> +++ b/Documentation/devicetree/bindings/usb/ehci-orion.txt
> @@ -1,7 +1,9 @@
>  * EHCI controller, Orion Marvell variants
>  
>  Required properties:
> -- compatible: must be "marvell,orion-ehci"
> +- compatible: must be one of the following
> +	"marvell,orion-ehci"
> +	"marvell,armada-3700-ehci"
>  - reg: physical base address of the controller and length of memory mapped
>    region.
>  - interrupts: The EHCI interrupt
> diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
> index ee8d5faa0194..1aec87ec68df 100644
> --- a/drivers/usb/host/ehci-orion.c
> +++ b/drivers/usb/host/ehci-orion.c
> @@ -47,6 +47,18 @@
>  #define USB_PHY_IVREF_CTRL	0x440
>  #define USB_PHY_TST_GRP_CTRL	0x450
>  
> +#define USB_SBUSCFG		0x90
> +
> +/* BAWR = BARD = 3 : Align read/write bursts packets larger than 128 bytes */
> +#define USB_SBUSCFG_BAWR_ALIGN_128B	(0x3 << 6)
> +#define USB_SBUSCFG_BARD_ALIGN_128B	(0x3 << 3)
> +/* AHBBRST = 3	   : Align AHB Burst to INCR16 (64 bytes) */
> +#define USB_SBUSCFG_AHBBRST_INCR16	(0x3 << 0)
> +
> +#define USB_SBUSCFG_DEF_VAL (USB_SBUSCFG_BAWR_ALIGN_128B	\
> +			     | USB_SBUSCFG_BARD_ALIGN_128B	\
> +			     | USB_SBUSCFG_AHBBRST_INCR16)
> +
>  #define DRIVER_DESC "EHCI orion driver"
>  
>  #define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)
> @@ -151,8 +163,31 @@ ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
>  	}
>  }
>  
> +static int ehci_orion_drv_reset(struct usb_hcd *hcd)
> +{
> +	struct device *dev = hcd->self.controller;
> +	int ret;
> +
> +	ret = ehci_setup(hcd);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * For SoC without hlock, need to program sbuscfg value to guarantee
> +	 * AHB master's burst would not overrun or underrun FIFO.
> +	 *
> +	 * sbuscfg reg has to be set after usb controller reset, otherwise
> +	 * the value would be override to 0.
> +	 */
> +	if (of_device_is_compatible(dev->of_node, "marvell,armada-3700-ehci"))
> +		wrl(USB_SBUSCFG, USB_SBUSCFG_DEF_VAL);
> +
> +	return ret;
> +}
> +
>  static const struct ehci_driver_overrides orion_overrides __initconst = {
>  	.extra_priv_size =	sizeof(struct orion_ehci_hcd),
> +	.reset = ehci_orion_drv_reset,
>  };
>  
>  static int ehci_orion_drv_probe(struct platform_device *pdev)
> @@ -310,6 +345,7 @@ static int ehci_orion_drv_remove(struct platform_device *pdev)
>  
>  static const struct of_device_id ehci_orion_dt_ids[] = {
>  	{ .compatible = "marvell,orion-ehci", },
> +	{ .compatible = "marvell,armada-3700-ehci", },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);
>