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Date: Wed, 20 Jun 2012 16:01:29 +0200
From: Roland Stigge <stigge@...com.de>
To: Alexandre Pereira da Silva <aletes.xgr@...il.com>
CC: Alan Stern <stern@...land.harvard.edu>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ohci-nxp: add usbd and otg clock initialization
On 06/20/2012 02:02 PM, Alexandre Pereira da Silva wrote:
> The ohci-nxp was assuming the clock was enabled by the board init or
> bootloader and just enabling the pll. This enables the usbd and otg
> clocks this periferal also needs.
>
> Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>
Acked-by: Roland Stigge <stigge@...com.de>
> ---
> drivers/usb/host/ohci-nxp.c | 88 +++++++++++++++++++++++++++----------------
> 1 file changed, 55 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/usb/host/ohci-nxp.c b/drivers/usb/host/ohci-nxp.c
> index 1e364ec..a446386 100644
> --- a/drivers/usb/host/ohci-nxp.c
> +++ b/drivers/usb/host/ohci-nxp.c
> @@ -43,16 +43,6 @@
> #define USB_HOST_NEED_CLK_EN (1 << 21)
> #define PAD_CONTROL_LAST_DRIVEN (1 << 19)
>
> -#define USB_OTG_CLK_CTRL IO_ADDRESS(USB_CONFIG_BASE + 0xFF4)
> -#define USB_OTG_CLK_STAT IO_ADDRESS(USB_CONFIG_BASE + 0xFF8)
> -
> -/* USB_OTG_CLK_CTRL bit defines */
> -#define AHB_M_CLOCK_ON (1 << 4)
> -#define OTG_CLOCK_ON (1 << 3)
> -#define I2C_CLOCK_ON (1 << 2)
> -#define DEV_CLOCK_ON (1 << 1)
> -#define HOST_CLOCK_ON (1 << 0)
> -
> #define USB_OTG_STAT_CONTROL IO_ADDRESS(USB_CONFIG_BASE + 0x110)
>
> /* USB_OTG_STAT_CONTROL bit defines */
> @@ -72,7 +62,9 @@ static struct i2c_client *isp1301_i2c_client;
>
> extern int usb_disabled(void);
>
> -static struct clk *usb_clk;
> +static struct clk *usb_pll_clk;
> +static struct clk *usb_dev_clk;
> +static struct clk *usb_otg_clk;
>
> static void isp1301_configure_pnx4008(void)
> {
> @@ -249,8 +241,6 @@ static const struct hc_driver ohci_nxp_hc_driver = {
> .start_port_reset = ohci_start_port_reset,
> };
>
> -#define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
> -
> static void nxp_set_usb_bits(void)
> {
> if (machine_is_pnx4008()) {
> @@ -327,41 +317,63 @@ static int __devinit usb_hcd_nxp_probe(struct platform_device *pdev)
> /* Enable AHB slave USB clock, needed for further USB clock control */
> __raw_writel(USB_SLAVE_HCLK_EN | PAD_CONTROL_LAST_DRIVEN, USB_CTRL);
>
> - isp1301_configure();
> -
> /* Enable USB PLL */
> - usb_clk = clk_get(&pdev->dev, "ck_pll5");
> - if (IS_ERR(usb_clk)) {
> + usb_pll_clk = clk_get(&pdev->dev, "ck_pll5");
> + if (IS_ERR(usb_pll_clk)) {
> dev_err(&pdev->dev, "failed to acquire USB PLL\n");
> - ret = PTR_ERR(usb_clk);
> + ret = PTR_ERR(usb_pll_clk);
> goto out1;
> }
>
> - ret = clk_enable(usb_clk);
> + ret = clk_enable(usb_pll_clk);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed to start USB PLL\n");
> goto out2;
> }
>
> - ret = clk_set_rate(usb_clk, 48000);
> + ret = clk_set_rate(usb_pll_clk, 48000);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed to set USB clock rate\n");
> goto out3;
> }
>
> + /* Enable USB device clock */
> + usb_dev_clk = clk_get(&pdev->dev, "ck_usbd");
> + if (IS_ERR(usb_dev_clk)) {
> + dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
> + ret = PTR_ERR(usb_dev_clk);
> + goto out4;
> + }
> +
> + ret = clk_enable(usb_dev_clk);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
> + goto out5;
> + }
> +
> + /* Enable USB otg clocks */
> + usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
> + if (IS_ERR(usb_otg_clk)) {
> + dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
> + ret = PTR_ERR(usb_dev_clk);
> + goto out6;
> + }
> +
> __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
>
> - /* Set to enable all needed USB clocks */
> - __raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
> + ret = clk_enable(usb_otg_clk);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
> + goto out7;
> + }
>
> - while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
> - USB_CLOCK_MASK) ;
> + isp1301_configure();
>
> hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
> if (!hcd) {
> dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
> ret = -ENOMEM;
> - goto out3;
> + goto out8;
> }
>
> /* Set all USB bits in the Start Enable register */
> @@ -371,14 +383,14 @@ static int __devinit usb_hcd_nxp_probe(struct platform_device *pdev)
> if (!res) {
> dev_err(&pdev->dev, "Failed to get MEM resource\n");
> ret = -ENOMEM;
> - goto out4;
> + goto out8;
> }
>
> hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
> if (!hcd->regs) {
> dev_err(&pdev->dev, "Failed to devm_request_and_ioremap\n");
> ret = -ENOMEM;
> - goto out4;
> + goto out8;
> }
> hcd->rsrc_start = res->start;
> hcd->rsrc_len = resource_size(res);
> @@ -386,7 +398,7 @@ static int __devinit usb_hcd_nxp_probe(struct platform_device *pdev)
> irq = platform_get_irq(pdev, 0);
> if (irq < 0) {
> ret = -ENXIO;
> - goto out4;
> + goto out8;
> }
>
> nxp_start_hc();
> @@ -400,13 +412,21 @@ static int __devinit usb_hcd_nxp_probe(struct platform_device *pdev)
> return ret;
>
> nxp_stop_hc();
> -out4:
> +out8:
> nxp_unset_usb_bits();
> usb_put_hcd(hcd);
> +out7:
> + clk_disable(usb_otg_clk);
> +out6:
> + clk_put(usb_otg_clk);
> +out5:
> + clk_disable(usb_dev_clk);
> +out4:
> + clk_put(usb_dev_clk);
> out3:
> - clk_disable(usb_clk);
> + clk_disable(usb_pll_clk);
> out2:
> - clk_put(usb_clk);
> + clk_put(usb_pll_clk);
> out1:
> isp1301_i2c_client = NULL;
> out:
> @@ -422,8 +442,10 @@ static int usb_hcd_nxp_remove(struct platform_device *pdev)
> release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
> usb_put_hcd(hcd);
> nxp_unset_usb_bits();
> - clk_disable(usb_clk);
> - clk_put(usb_clk);
> + clk_disable(usb_pll_clk);
> + clk_put(usb_pll_clk);
> + clk_disable(usb_dev_clk);
> + clk_put(usb_dev_clk);
> i2c_unregister_device(isp1301_i2c_client);
> isp1301_i2c_client = NULL;
>
--
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