From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/usb/host/ehci-omap.c | 327 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 327 insertions(+) create mode 100644 drivers/usb/host/ehci-omap.c (limited to 'drivers/usb/host/ehci-omap.c') diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c new file mode 100644 index 000000000..a24720beb --- /dev/null +++ b/drivers/usb/host/ehci-omap.c @@ -0,0 +1,327 @@ +/* + * ehci-omap.c - driver for USBHOST on OMAP3/4 processors + * + * Bus Glue for the EHCI controllers in OMAP3/4 + * Tested on several OMAP3 boards, and OMAP4 Pandaboard + * + * Copyright (C) 2007-2013 Texas Instruments, Inc. + * Author: Vikram Pandita + * Author: Anand Gadiyar + * Author: Keshava Munegowda + * Author: Roger Quadros + * + * Copyright (C) 2009 Nokia Corporation + * Contact: Felipe Balbi + * + * Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ehci.h" + +#include + +/* EHCI Register Set */ +#define EHCI_INSNREG04 (0xA0) +#define EHCI_INSNREG04_DISABLE_UNSUSPEND (1 << 5) +#define EHCI_INSNREG05_ULPI (0xA4) +#define EHCI_INSNREG05_ULPI_CONTROL_SHIFT 31 +#define EHCI_INSNREG05_ULPI_PORTSEL_SHIFT 24 +#define EHCI_INSNREG05_ULPI_OPSEL_SHIFT 22 +#define EHCI_INSNREG05_ULPI_REGADD_SHIFT 16 +#define EHCI_INSNREG05_ULPI_EXTREGADD_SHIFT 8 +#define EHCI_INSNREG05_ULPI_WRDATA_SHIFT 0 + +#define DRIVER_DESC "OMAP-EHCI Host Controller driver" + +static const char hcd_name[] = "ehci-omap"; + +/*-------------------------------------------------------------------------*/ + +struct omap_hcd { + struct usb_phy *phy[OMAP3_HS_USB_PORTS]; /* one PHY for each port */ + int nports; +}; + +static inline void ehci_write(void __iomem *base, u32 reg, u32 val) +{ + __raw_writel(val, base + reg); +} + +static inline u32 ehci_read(void __iomem *base, u32 reg) +{ + return __raw_readl(base + reg); +} + +/* configure so an HC device and id are always provided */ +/* always called with process context; sleeping is OK */ + +static struct hc_driver __read_mostly ehci_omap_hc_driver; + +static const struct ehci_driver_overrides ehci_omap_overrides __initdata = { + .extra_priv_size = sizeof(struct omap_hcd), +}; + +/** + * ehci_hcd_omap_probe - initialize TI-based HCDs + * + * Allocates basic resources for this USB host controller, and + * then invokes the start() method for the HCD associated with it + * through the hotplug entry's driver_data. + */ +static int ehci_hcd_omap_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct usbhs_omap_platform_data *pdata = dev_get_platdata(dev); + struct resource *res; + struct usb_hcd *hcd; + void __iomem *regs; + int ret; + int irq; + int i; + struct omap_hcd *omap; + + if (usb_disabled()) + return -ENODEV; + + if (!dev->parent) { + dev_err(dev, "Missing parent device\n"); + return -ENODEV; + } + + /* For DT boot, get platform data from parent. i.e. usbhshost */ + if (dev->of_node) { + pdata = dev_get_platdata(dev->parent); + dev->platform_data = pdata; + } + + if (!pdata) { + dev_err(dev, "Missing platform data\n"); + return -ENODEV; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(dev, "EHCI irq failed\n"); + return -ENODEV; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + regs = devm_ioremap_resource(dev, res); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + /* + * Right now device-tree probed devices don't get dma_mask set. + * Since shared usb code relies on it, set it here for now. + * Once we have dma capability bindings this can go away. + */ + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + ret = -ENODEV; + hcd = usb_create_hcd(&ehci_omap_hc_driver, dev, + dev_name(dev)); + if (!hcd) { + dev_err(dev, "Failed to create HCD\n"); + return -ENOMEM; + } + + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + hcd->regs = regs; + hcd_to_ehci(hcd)->caps = regs; + + omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv; + omap->nports = pdata->nports; + + platform_set_drvdata(pdev, hcd); + + /* get the PHY devices if needed */ + for (i = 0 ; i < omap->nports ; i++) { + struct usb_phy *phy; + + /* get the PHY device */ + if (dev->of_node) + phy = devm_usb_get_phy_by_phandle(dev, "phys", i); + else + phy = devm_usb_get_phy_dev(dev, i); + if (IS_ERR(phy)) { + /* Don't bail out if PHY is not absolutely necessary */ + if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) + continue; + + ret = PTR_ERR(phy); + dev_err(dev, "Can't get PHY device for port %d: %d\n", + i, ret); + goto err_phy; + } + + omap->phy[i] = phy; + + if (pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) { + usb_phy_init(omap->phy[i]); + /* bring PHY out of suspend */ + usb_phy_set_suspend(omap->phy[i], 0); + } + } + + pm_runtime_enable(dev); + pm_runtime_get_sync(dev); + + /* + * An undocumented "feature" in the OMAP3 EHCI controller, + * causes suspended ports to be taken out of suspend when + * the USBCMD.Run/Stop bit is cleared (for example when + * we do ehci_bus_suspend). + * This breaks suspend-resume if the root-hub is allowed + * to suspend. Writing 1 to this undocumented register bit + * disables this feature and restores normal behavior. + */ + ehci_write(regs, EHCI_INSNREG04, + EHCI_INSNREG04_DISABLE_UNSUSPEND); + + ret = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (ret) { + dev_err(dev, "failed to add hcd with err %d\n", ret); + goto err_pm_runtime; + } + device_wakeup_enable(hcd->self.controller); + + /* + * Bring PHYs out of reset for non PHY modes. + * Even though HSIC mode is a PHY-less mode, the reset + * line exists between the chips and can be modelled + * as a PHY device for reset control. + */ + for (i = 0; i < omap->nports; i++) { + if (!omap->phy[i] || + pdata->port_mode[i] == OMAP_EHCI_PORT_MODE_PHY) + continue; + + usb_phy_init(omap->phy[i]); + /* bring PHY out of suspend */ + usb_phy_set_suspend(omap->phy[i], 0); + } + + return 0; + +err_pm_runtime: + pm_runtime_put_sync(dev); + +err_phy: + for (i = 0; i < omap->nports; i++) { + if (omap->phy[i]) + usb_phy_shutdown(omap->phy[i]); + } + + usb_put_hcd(hcd); + + return ret; +} + + +/** + * ehci_hcd_omap_remove - shutdown processing for EHCI HCDs + * @pdev: USB Host Controller being removed + * + * Reverses the effect of usb_ehci_hcd_omap_probe(), first invoking + * the HCD's stop() method. It is always called from a thread + * context, normally "rmmod", "apmd", or something similar. + */ +static int ehci_hcd_omap_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct omap_hcd *omap = (struct omap_hcd *)hcd_to_ehci(hcd)->priv; + int i; + + usb_remove_hcd(hcd); + + for (i = 0; i < omap->nports; i++) { + if (omap->phy[i]) + usb_phy_shutdown(omap->phy[i]); + } + + usb_put_hcd(hcd); + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + + return 0; +} + +static const struct of_device_id omap_ehci_dt_ids[] = { + { .compatible = "ti,ehci-omap" }, + { } +}; + +MODULE_DEVICE_TABLE(of, omap_ehci_dt_ids); + +static struct platform_driver ehci_hcd_omap_driver = { + .probe = ehci_hcd_omap_probe, + .remove = ehci_hcd_omap_remove, + .shutdown = usb_hcd_platform_shutdown, + /*.suspend = ehci_hcd_omap_suspend, */ + /*.resume = ehci_hcd_omap_resume, */ + .driver = { + .name = hcd_name, + .of_match_table = omap_ehci_dt_ids, + } +}; + +/*-------------------------------------------------------------------------*/ + +static int __init ehci_omap_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + ehci_init_driver(&ehci_omap_hc_driver, &ehci_omap_overrides); + return platform_driver_register(&ehci_hcd_omap_driver); +} +module_init(ehci_omap_init); + +static void __exit ehci_omap_cleanup(void) +{ + platform_driver_unregister(&ehci_hcd_omap_driver); +} +module_exit(ehci_omap_cleanup); + +MODULE_ALIAS("platform:ehci-omap"); +MODULE_AUTHOR("Texas Instruments, Inc."); +MODULE_AUTHOR("Felipe Balbi "); +MODULE_AUTHOR("Roger Quadros "); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-54-g00ecf