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Date: Wed, 20 Jun 2012 16:01:55 +0200
From: Roland Stigge <stigge@...com.de>
To: Alexandre Pereira da Silva <aletes.xgr@...il.com>
CC: Felipe Balbi <balbi@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: lpc32xx_udc: move clock init to clock framework
On 06/20/2012 02:03 PM, Alexandre Pereira da Silva wrote:
> Moves clock initialization to the clock framework.
>
> Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>
Acked-by: Roland Stigge <stigge@...com.de>
> ---
> drivers/usb/gadget/lpc32xx_udc.c | 84 +++++++++++---------------------------
> 1 file changed, 24 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/usb/gadget/lpc32xx_udc.c b/drivers/usb/gadget/lpc32xx_udc.c
> index 262acfd..d227d93 100644
> --- a/drivers/usb/gadget/lpc32xx_udc.c
> +++ b/drivers/usb/gadget/lpc32xx_udc.c
> @@ -164,6 +164,7 @@ struct lpc32xx_udc {
> int udp_irq[4];
> struct clk *usb_pll_clk;
> struct clk *usb_slv_clk;
> + struct clk *usb_otg_clk;
>
> /* DMA support */
> u32 *udca_v_base;
> @@ -226,33 +227,15 @@ static inline struct lpc32xx_udc *to_udc(struct usb_gadget *g)
> #define UDCA_BUFF_SIZE (128)
>
> /* TODO: When the clock framework is introduced in LPC32xx, IO_ADDRESS will
> - * be replaced with an inremap()ed pointer, see USB_OTG_CLK_CTRL()
> + * be replaced with an inremap()ed pointer
> * */
> #define USB_CTRL IO_ADDRESS(LPC32XX_CLK_PM_BASE + 0x64)
> -#define USB_CLOCK_MASK (AHB_M_CLOCK_ON | OTG_CLOCK_ON | \
> - DEV_CLOCK_ON | I2C_CLOCK_ON)
>
> /* USB_CTRL bit defines */
> #define USB_SLAVE_HCLK_EN (1 << 24)
> #define USB_HOST_NEED_CLK_EN (1 << 21)
> #define USB_DEV_NEED_CLK_EN (1 << 22)
>
> -#define USB_OTG_CLK_CTRL(udc) ((udc)->udp_baseaddr + 0xFF4)
> -#define USB_OTG_CLK_STAT(udc) ((udc)->udp_baseaddr + 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(udc) (udc->udp_baseaddr + 0x110)
> -
> -/* USB_OTG_STAT_CONTROL bit defines */
> -#define TRANSPARENT_I2C_EN (1 << 7)
> -#define HOST_EN (1 << 0)
> -
> /**********************************************************************
> * USB device controller register offsets
> **********************************************************************/
> @@ -676,7 +659,7 @@ static void isp1301_udc_configure(struct lpc32xx_udc *udc)
> ISP1301_I2C_INTERRUPT_RISING, INT_VBUS_VLD);
>
> /* Enable usb_need_clk clock after transceiver is initialized */
> - writel((readl(USB_CTRL) | (1 << 22)), USB_CTRL);
> + writel((readl(USB_CTRL) | USB_DEV_NEED_CLK_EN), USB_CTRL);
>
> dev_info(udc->dev, "ISP1301 Vendor ID : 0x%04x\n",
> i2c_smbus_read_word_data(udc->isp1301_i2c_client, 0x00));
> @@ -1009,11 +992,8 @@ static void udc_dd_free(struct lpc32xx_udc *udc, struct lpc32xx_usbd_dd_gad *dd)
> /* Enables or disables most of the USB system clocks when low power mode is
> * needed. Clocks are typically started on a connection event, and disabled
> * when a cable is disconnected */
> -#define OTGOFF_CLK_MASK (AHB_M_CLOCK_ON | I2C_CLOCK_ON)
> static void udc_clk_set(struct lpc32xx_udc *udc, int enable)
> {
> - int to = 1000;
> -
> if (enable != 0) {
> if (udc->clocked)
> return;
> @@ -1027,14 +1007,7 @@ static void udc_clk_set(struct lpc32xx_udc *udc, int enable)
> writel(readl(USB_CTRL) | USB_DEV_NEED_CLK_EN,
> USB_CTRL);
>
> - /* Set to enable all needed USB OTG clocks */
> - writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL(udc));
> -
> - while (((readl(USB_OTG_CLK_STAT(udc)) & USB_CLOCK_MASK) !=
> - USB_CLOCK_MASK) && (to > 0))
> - to--;
> - if (!to)
> - dev_dbg(udc->dev, "Cannot enable USB OTG clocking\n");
> + clk_enable(udc->usb_otg_clk);
> } else {
> if (!udc->clocked)
> return;
> @@ -1046,19 +1019,11 @@ static void udc_clk_set(struct lpc32xx_udc *udc, int enable)
> /* 48MHz PLL dpwn */
> clk_disable(udc->usb_pll_clk);
>
> - /* Enable the USB device clock */
> + /* Disable the USB device clock */
> writel(readl(USB_CTRL) & ~USB_DEV_NEED_CLK_EN,
> USB_CTRL);
>
> - /* Set to enable all needed USB OTG clocks */
> - writel(OTGOFF_CLK_MASK, USB_OTG_CLK_CTRL(udc));
> -
> - while (((readl(USB_OTG_CLK_STAT(udc)) &
> - OTGOFF_CLK_MASK) !=
> - OTGOFF_CLK_MASK) && (to > 0))
> - to--;
> - if (!to)
> - dev_dbg(udc->dev, "Cannot disable USB OTG clocking\n");
> + clk_disable(udc->usb_otg_clk);
> }
> }
>
> @@ -3238,6 +3203,12 @@ static int __init lpc32xx_udc_probe(struct platform_device *pdev)
> retval = PTR_ERR(udc->usb_slv_clk);
> goto usb_clk_get_fail;
> }
> + udc->usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
> + if (IS_ERR(udc->usb_otg_clk)) {
> + dev_err(udc->dev, "failed to acquire USB otg clock\n");
> + retval = PTR_ERR(udc->usb_slv_clk);
> + goto usb_otg_clk_get_fail;
> + }
>
> /* Setup PLL clock to 48MHz */
> retval = clk_enable(udc->usb_pll_clk);
> @@ -3261,15 +3232,12 @@ static int __init lpc32xx_udc_probe(struct platform_device *pdev)
> goto usb_clk_enable_fail;
> }
>
> - /* Set to enable all needed USB OTG clocks */
> - writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL(udc));
> -
> - i = 1000;
> - while (((readl(USB_OTG_CLK_STAT(udc)) & USB_CLOCK_MASK) !=
> - USB_CLOCK_MASK) && (i > 0))
> - i--;
> - if (!i)
> - dev_dbg(udc->dev, "USB OTG clocks not correctly enabled\n");
> + /* Enable USB OTG clock */
> + retval = clk_enable(udc->usb_otg_clk);
> + if (retval < 0) {
> + dev_err(udc->dev, "failed to start USB otg clock\n");
> + goto usb_otg_clk_enable_fail;
> + }
>
> /* Setup deferred workqueue data */
> udc->poweron = udc->pullup = 0;
> @@ -3389,12 +3357,16 @@ dma_alloc_fail:
> dma_free_coherent(&pdev->dev, UDCA_BUFF_SIZE,
> udc->udca_v_base, udc->udca_p_base);
> i2c_fail:
> + clk_disable(udc->usb_otg_clk);
> +usb_otg_clk_enable_fail:
> clk_disable(udc->usb_slv_clk);
> usb_clk_enable_fail:
> pll_set_fail:
> clk_disable(udc->usb_pll_clk);
> pll_enable_fail:
> clk_put(udc->usb_slv_clk);
> +usb_otg_clk_get_fail:
> + clk_put(udc->usb_otg_clk);
> usb_clk_get_fail:
> clk_put(udc->usb_pll_clk);
> pll_get_fail:
> @@ -3432,6 +3404,8 @@ static int __devexit lpc32xx_udc_remove(struct platform_device *pdev)
>
> device_unregister(&udc->gadget.dev);
>
> + clk_disable(udc->usb_otg_clk);
> + clk_put(udc->usb_otg_clk);
> clk_disable(udc->usb_slv_clk);
> clk_put(udc->usb_slv_clk);
> clk_disable(udc->usb_pll_clk);
> @@ -3445,7 +3419,6 @@ static int __devexit lpc32xx_udc_remove(struct platform_device *pdev)
> #ifdef CONFIG_PM
> static int lpc32xx_udc_suspend(struct platform_device *pdev, pm_message_t mesg)
> {
> - int to = 1000;
> struct lpc32xx_udc *udc = platform_get_drvdata(pdev);
>
> if (udc->clocked) {
> @@ -3460,15 +3433,6 @@ static int lpc32xx_udc_suspend(struct platform_device *pdev, pm_message_t mesg)
> on resume */
> udc->clocked = 1;
>
> - /* Kill OTG and I2C clocks */
> - writel(0, USB_OTG_CLK_CTRL(udc));
> - while (((readl(USB_OTG_CLK_STAT(udc)) & OTGOFF_CLK_MASK) !=
> - OTGOFF_CLK_MASK) && (to > 0))
> - to--;
> - if (!to)
> - dev_dbg(udc->dev,
> - "USB OTG clocks not correctly enabled\n");
> -
> /* Kill global USB clock */
> clk_disable(udc->usb_slv_clk);
> }
--
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