From mboxrd@z Thu Jan 1 00:00:00 1970 From: marex@denx.de (Marek Vasut) Date: Mon, 30 Apr 2012 00:34:17 +0200 Subject: [PATCH 09/11] MXS: Add USB PHY driver In-Reply-To: <1335738860-26623-1-git-send-email-marex@denx.de> References: <1335738860-26623-1-git-send-email-marex@denx.de> Message-ID: <1335738860-26623-10-git-send-email-marex@denx.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Add driver that controls the built-in USB PHY in the i.MX233/i.MX28. This enables the PHY upon powerup and shuts it down on shutdown. Signed-off-by: Marek Vasut Cc: Chen Peter-B29397 Cc: Detlev Zundel Cc: Fabio Estevam Cc: Li Frank-B20596 Cc: Linux USB Cc: Liu JunJie-B08287 Cc: Sascha Hauer Cc: Shawn Guo Cc: Shi Make-B15407 Cc: Stefano Babic Cc: Subodh Nijsure Cc: Wolfgang Denk --- drivers/usb/otg/Kconfig | 10 ++ drivers/usb/otg/Makefile | 1 + drivers/usb/otg/mxs-phy.c | 293 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 304 insertions(+) create mode 100644 drivers/usb/otg/mxs-phy.c diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig index e7c6325..1de1495 100644 --- a/drivers/usb/otg/Kconfig +++ b/drivers/usb/otg/Kconfig @@ -122,6 +122,16 @@ config USB_IMX_COMPOSITE Composite driver that handles clock and memory mapping for i.MX USB host and USB PHY. +config USB_MXS_PHY + tristate "Freescale i.MX28 USB PHY support" + select USB_OTG_UTILS + select USB_IMX_COMPOSITE + help + Say Y here if you want to build Freescale i.MX28 USB PHY + driver in kernel. + + To compile this driver as a module, choose M here. + config USB_MV_OTG tristate "Marvell USB OTG support" depends on USB_EHCI_MV && USB_MV_UDC && USB_SUSPEND diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile index 7d2c631..b8d7d5c 100644 --- a/drivers/usb/otg/Makefile +++ b/drivers/usb/otg/Makefile @@ -21,4 +21,5 @@ obj-$(CONFIG_AB8500_USB) += ab8500-usb.o fsl_usb2_otg-objs := fsl_otg.o otg_fsm.o obj-$(CONFIG_FSL_USB2_OTG) += fsl_usb2_otg.o obj-$(CONFIG_USB_IMX_COMPOSITE) += imx-otg.o +obj-$(CONFIG_USB_MXS_PHY) += mxs-phy.o obj-$(CONFIG_USB_MV_OTG) += mv_otg.o diff --git a/drivers/usb/otg/mxs-phy.c b/drivers/usb/otg/mxs-phy.c new file mode 100644 index 0000000..334b095 --- /dev/null +++ b/drivers/usb/otg/mxs-phy.c @@ -0,0 +1,293 @@ +/* + * drivers/usb/otg/mxs-phy.c + * + * Freescale i.MX28 USB PHY driver. + * + * Copyright (C) 2012 Marek Vasut + * on behalf of DENX Software Engineering GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +struct mxs_usb_phy { + struct usb_phy phy; + struct clk *clk; + int irq; + uint32_t status; +}; + +static int mxs_usb_phy_init(struct usb_phy *x) +{ + struct mxs_usb_phy *phy = container_of(x, struct mxs_usb_phy, phy); + uint32_t val; + + /* Enable clock to the PHY. */ + clk_enable(phy->clk); + + /* Reset the PHY block. */ + mxs_reset_block(x->io_priv + HW_USBPHY_CTRL); + + /* Power up the PHY. */ + writel(0, x->io_priv + HW_USBPHY_PWD); + + /* Clear the wakeup IRQ before enabling them below. */ + writel(BM_USBPHY_CTRL_RESUME_IRQ | BM_USBPHY_CTRL_WAKEUP_IRQ, + x->io_priv + HW_USBPHY_CTRL_CLR); + + /* Enable FS/LS compatibility and wakeup IRQs. */ + val = BM_USBPHY_CTRL_ENUTMILEVEL2 | BM_USBPHY_CTRL_ENUTMILEVEL3 | + BM_USBPHY_CTRL_ENIRQWAKEUP; + + /* Enable IRQ sources. */ + val |= BM_USBPHY_CTRL_ENIDCHG_WKUP | BM_USBPHY_CTRL_ENDPDMCHG_WKUP | + BM_USBPHY_CTRL_ENVBUSCHG_WKUP; + + writel(val, x->io_priv + HW_USBPHY_CTRL_SET); + + return 0; +} + +static void mxs_usb_phy_shutdown(struct usb_phy *x) +{ + struct mxs_usb_phy *phy = container_of(x, struct mxs_usb_phy, phy); + uint32_t val; + + /* Clear the wakeup IRQ before disabling them below. */ + writel(BM_USBPHY_CTRL_RESUME_IRQ | BM_USBPHY_CTRL_WAKEUP_IRQ, + x->io_priv + HW_USBPHY_CTRL_CLR); + + /* Disable FS/LS compatibility and wakeup IRQs. */ + val = BM_USBPHY_CTRL_ENUTMILEVEL2 | BM_USBPHY_CTRL_ENUTMILEVEL3 | + BM_USBPHY_CTRL_ENIRQWAKEUP; + + /* Disable IRQ sources. */ + val |= BM_USBPHY_CTRL_ENIDCHG_WKUP | BM_USBPHY_CTRL_ENDPDMCHG_WKUP | + BM_USBPHY_CTRL_ENVBUSCHG_WKUP; + + writel(val, x->io_priv + HW_USBPHY_CTRL_CLR); + + /* + * The interrupt must be disabled for at least 3 cycles of the + * standby clock (32kHz), that is 0.094 ms. + */ + udelay(100); + + /* Gate off the PHY. */ + writel(BM_USBPHY_CTRL_CLKGATE, x->io_priv + HW_USBPHY_CTRL_SET); + + /* Disable clock to the PHY. */ + clk_disable(phy->clk); +} + +static irqreturn_t mxs_phy_irq(int irq, void *irqdata) +{ + struct mxs_usb_phy *phy = irqdata; + struct usb_phy *x = &phy->phy; + struct usb_otg *otg = x->otg; + struct imx_otg_priv *priv = container_of(otg, struct imx_otg_priv, otg); + struct imx_otg *data = container_of(priv, struct imx_otg, priv); + uint32_t status; + + if (otg->host) { + status = readl(data->mem + 0x144); + if (~(phy->status ^ status) & STS_PCD) + return IRQ_NONE; + + phy->status = status; + + if (phy->status & STS_PCD) { + writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, + x->io_priv + HW_USBPHY_CTRL_CLR); + } else { + writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, + x->io_priv + HW_USBPHY_CTRL_SET); + } + } + + return IRQ_NONE; +} + +static int __devinit mxs_phy_probe(struct platform_device *pdev) +{ + struct imx_usb_platform_data *pdata = pdev->dev.platform_data; + struct mxs_usb_phy *phy; + struct resource *mem_res; + void *retp; + int ret; + + if (!pdata) { + dev_err(&pdev->dev, "No platform data supplied!\n"); + ret = -ENODEV; + goto err_pdata; + } + + /* Allocate PHY driver's private data. */ + phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); + if (!phy) { + dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n"); + ret = -ENOMEM; + goto err_pdata; + } + + /* Get memory area for PHY from resources. */ + mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem_res) { + dev_err(&pdev->dev, "Specify memory area for this USB PHY!\n"); + ret = -ENODEV; + goto err_pdata; + } + + /* Request the memory region for this USB PHY. */ + retp = devm_request_mem_region(&pdev->dev, mem_res->start, + resource_size(mem_res), pdev->name); + if (!retp) { + dev_err(&pdev->dev, "USB PHY memory area already in use!\n"); + ret = -EBUSY; + goto err_pdata; + } + + /* Map the memory region for USB PHY. */ + phy->phy.io_priv = devm_ioremap(&pdev->dev, mem_res->start, + resource_size(mem_res)); + if (!phy->phy.io_priv) { + dev_err(&pdev->dev, "Memory mapping of USB PHY failed!\n"); + ret = -EFAULT; + goto err_pdata; + } + + /* Get IRQ for PHY from resources. */ + phy->irq = platform_get_irq(pdev, 0); + if (phy->irq < 0) { + dev_err(&pdev->dev, "Specify IRQ for this USB Host!\n"); + ret = -ENODEV; + goto err_pdata; + } + + /* Request the PHY IRQ. */ + ret = devm_request_irq(&pdev->dev, phy->irq, mxs_phy_irq, + IRQF_SHARED, "mxs-phy-usb-irq", phy); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to request IRQ!\n"); + goto err_pdata; + } + + /* Claim the PHY clock. */ + phy->clk = clk_get(&pdev->dev, "phy"); + if (!phy->clk) { + dev_err(&pdev->dev, "Failed to claim clock for USB PHY!\n"); + ret = PTR_ERR(phy->clk); + goto err_pdata; + } + + /* Prepare PHY clock. */ + ret = clk_prepare(phy->clk); + if (ret) { + dev_err(&pdev->dev, "Failed to prepare clock for USB PHY!\n"); + goto err_prepare_phy_clock; + } + + /* Setup the PHY structures. */ + phy->phy.dev = &pdev->dev; + phy->phy.label = "mxs-usb-phy"; + phy->phy.init = mxs_usb_phy_init; + phy->phy.shutdown = mxs_usb_phy_shutdown; + phy->phy.state = OTG_STATE_UNDEFINED; + + platform_set_drvdata(pdev, phy); + + ATOMIC_INIT_NOTIFIER_HEAD(&phy->phy.notifier); + + /* Register the transceiver with kernel. */ + ret = usb_set_transceiver(&phy->phy); + if (ret) { + dev_err(&pdev->dev, "Can't register transceiver, (%d)\n", ret); + goto err_set_transceiver; + } + + return 0; + +err_set_transceiver: + clk_unprepare(phy->clk); +err_prepare_phy_clock: + clk_put(phy->clk); +err_pdata: + return ret; +} + +static int __devexit mxs_phy_remove(struct platform_device *pdev) +{ + struct mxs_usb_phy *phy = platform_get_drvdata(pdev); + + /* Power down the PHY. */ + mxs_usb_phy_shutdown(&phy->phy); + + /* Remove the transceiver. */ + usb_set_transceiver(NULL); + + /* Stop the PHY clock. */ + clk_disable_unprepare(phy->clk); + clk_put(phy->clk); + + /* Free the rest. */ + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver mxs_phy_driver = { + .probe = mxs_phy_probe, + .remove = __devexit_p(mxs_phy_remove), + .driver = { + .name = "mxs-usb-phy", + .owner = THIS_MODULE, + }, +}; + +static int __init mxs_phy_init(void) +{ + return platform_driver_register(&mxs_phy_driver); +} + +static void __exit mxs_phy_exit(void) +{ + platform_driver_unregister(&mxs_phy_driver); +} + +arch_initcall(mxs_phy_init); +module_exit(mxs_phy_exit); + +MODULE_ALIAS("platform:mxs-usb-phy"); +MODULE_AUTHOR("Marek Vasut "); +MODULE_DESCRIPTION("Freescale i.MX28 USB PHY driver"); +MODULE_LICENSE("GPL"); -- 1.7.10