[PATCH 5/7] ehci mxc: make it more flexible to be used for mx28

[Sascha Hauer]

On Wed, Jul 20, 2011 at 07:08:24PM +0800, Tony Lin wrote:
> old driver uses some hard coding for clks' name which could
> not be used for mx28. So workaround these hard codings by
> judging the cpu is mx28 or not.
> add platform callback funtions in usb irq handler in the case
> usb phy need to change its disconnect detector mode after usb
> device is connected and disconnected. These callbacks also
> could be used for other machines whose usb phy need such kind
> of operations
> 
> Signed-off-by: Tony Lin <tony.lin at freescale.com>
> ---
>  drivers/usb/host/Kconfig    |    2 +-
>  drivers/usb/host/ehci-mxc.c |   57 +++++++++++++++++++++++++++++++-----------
>  2 files changed, 43 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index ab085f1..6a5905b 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -139,7 +139,7 @@ config USB_EHCI_FSL
>  
>  config USB_EHCI_MXC
>  	bool "Support for Freescale on-chip EHCI USB controller"
> -	depends on USB_EHCI_HCD && ARCH_MXC
> +	depends on USB_EHCI_HCD && (ARCH_MXC || ARCH_MXS)
>  	select USB_EHCI_ROOT_HUB_TT
>  	---help---
>  	  Variation of ARC USB block used in some Freescale chips.
> diff --git a/drivers/usb/host/ehci-mxc.c b/drivers/usb/host/ehci-mxc.c
> index 0c058be..65e78cd 100644
> --- a/drivers/usb/host/ehci-mxc.c
> +++ b/drivers/usb/host/ehci-mxc.c
> @@ -23,9 +23,7 @@
>  #include <linux/usb/otg.h>
>  #include <linux/usb/ulpi.h>
>  #include <linux/slab.h>
> -
> -#include <mach/mxc_ehci.h>
> -
> +#include <linux/fsl_devices.h>
>  #include <asm/mach-types.h>
>  
>  #define ULPI_VIEWPORT_OFFSET	0x170
> @@ -66,6 +64,30 @@ static int ehci_mxc_setup(struct usb_hcd *hcd)
>  	return 0;
>  }
>  
> +static irqreturn_t fsl_ehci_irq(struct usb_hcd *hcd)
> +{
> +	struct mxc_usbh_platform_data *pdata;
> +	struct ehci_hcd		*ehci = hcd_to_ehci(hcd);
> +	u32			status;
> +
> +	pdata = hcd->self.controller->platform_data;
> +	if (pdata->plt_get_usb_connect_status == NULL || \

This backslash is unnecessary

> +		pdata->plt_usb_disconnect_detect == NULL)
> +		goto out;
> +
> +	spin_lock(&ehci->lock);
> +	status = ehci_readl(ehci, &ehci->regs->status);
> +	if (status & STS_PCD) {
> +		if (pdata->plt_get_usb_connect_status())
> +			pdata->plt_usb_disconnect_detect(true);
> +		else
> +			pdata->plt_usb_disconnect_detect(false);
> +	}
> +	spin_unlock(&ehci->lock);
> +out:
> +	return ehci_irq(hcd);
> +}
> +
>  static const struct hc_driver ehci_mxc_hc_driver = {
>  	.description = hcd_name,
>  	.product_desc = "Freescale On-Chip EHCI Host Controller",
> @@ -74,7 +96,7 @@ static const struct hc_driver ehci_mxc_hc_driver = {
>  	/*
>  	 * generic hardware linkage
>  	 */
> -	.irq = ehci_irq,
> +	.irq = fsl_ehci_irq,
>  	.flags = HCD_USB2 | HCD_MEMORY,
>  
>  	/*
> @@ -165,14 +187,15 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
>  	}
>  
>  	/* enable clocks */
> -	priv->usbclk = clk_get(dev, "usb");
> -	if (IS_ERR(priv->usbclk)) {
> -		ret = PTR_ERR(priv->usbclk);
> -		goto err_clk;
> +	if (!cpu_is_mx28()) {
> +		priv->usbclk = clk_get(dev, "usb");
> +		if (IS_ERR(priv->usbclk)) {
> +			ret = PTR_ERR(priv->usbclk);
> +			goto err_clk;
> +		}
> +		clk_enable(priv->usbclk);
>  	}

We should start and provide dummy clocks for usb and ahb clock on
platform which do not have them. Then we can get rid of the cpu checks
in the driver.

> -	clk_enable(priv->usbclk);
> -
> -	if (!cpu_is_mx35() && !cpu_is_mx25()) {
> +	if (!cpu_is_mx35() && !cpu_is_mx25() && !cpu_is_mx28()) {
>  		priv->ahbclk = clk_get(dev, "usb_ahb");
>  		if (IS_ERR(priv->ahbclk)) {
>  			ret = PTR_ERR(priv->ahbclk);
> @@ -272,8 +295,10 @@ err_clk_phy:
>  		clk_put(priv->ahbclk);
>  	}
>  err_clk_ahb:
> -	clk_disable(priv->usbclk);
> -	clk_put(priv->usbclk);
> +	if (priv->usbclk) {
> +		clk_disable(priv->usbclk);
> +		clk_put(priv->usbclk);
> +	}
>  err_clk:
>  	iounmap(hcd->regs);
>  err_ioremap:
> @@ -304,8 +329,10 @@ static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
>  	usb_put_hcd(hcd);
>  	platform_set_drvdata(pdev, NULL);
>  
> -	clk_disable(priv->usbclk);
> -	clk_put(priv->usbclk);
> +	if (priv->usbclk) {
> +		clk_disable(priv->usbclk);
> +		clk_put(priv->usbclk);
> +	}
>  	if (priv->ahbclk) {
>  		clk_disable(priv->ahbclk);
>  		clk_put(priv->ahbclk);
> -- 
> 1.7.0.4
> 
> 
> 
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> 

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