| /* |
| * 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) 2007-2011 Texas Instruments, Inc. |
| * Author: Vikram Pandita <vikram.pandita@ti.com> |
| * Author: Anand Gadiyar <gadiyar@ti.com> |
| * Author: Keshava Munegowda <keshava_mgowda@ti.com> |
| * |
| * Copyright (C) 2009 Nokia Corporation |
| * Contact: Felipe Balbi <felipe.balbi@nokia.com> |
| * |
| * 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 |
| * |
| * TODO (last updated Feb 27, 2010): |
| * - add kernel-doc |
| * - enable AUTOIDLE |
| * - add suspend/resume |
| * - add HSIC and TLL support |
| * - convert to use hwmod and runtime PM |
| */ |
| |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/usb/ulpi.h> |
| #include <plat/usb.h> |
| #include <linux/regulator/consumer.h> |
| |
| /* 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 |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static const struct hc_driver ehci_omap_hc_driver; |
| |
| |
| 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); |
| } |
| |
| static void omap_ehci_soft_phy_reset(struct platform_device *pdev, u8 port) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev); |
| unsigned long timeout = jiffies + msecs_to_jiffies(1000); |
| unsigned reg = 0; |
| |
| reg = ULPI_FUNC_CTRL_RESET |
| /* FUNCTION_CTRL_SET register */ |
| | (ULPI_SET(ULPI_FUNC_CTRL) << EHCI_INSNREG05_ULPI_REGADD_SHIFT) |
| /* Write */ |
| | (2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT) |
| /* PORTn */ |
| | ((port + 1) << EHCI_INSNREG05_ULPI_PORTSEL_SHIFT) |
| /* start ULPI access*/ |
| | (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT); |
| |
| ehci_write(hcd->regs, EHCI_INSNREG05_ULPI, reg); |
| |
| /* Wait for ULPI access completion */ |
| while ((ehci_read(hcd->regs, EHCI_INSNREG05_ULPI) |
| & (1 << EHCI_INSNREG05_ULPI_CONTROL_SHIFT))) { |
| cpu_relax(); |
| |
| if (time_after(jiffies, timeout)) { |
| dev_dbg(&pdev->dev, "phy reset operation timed out\n"); |
| break; |
| } |
| } |
| } |
| |
| |
| /* configure so an HC device and id are always provided */ |
| /* always called with process context; sleeping is OK */ |
| |
| /** |
| * 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 ehci_hcd_omap_platform_data *pdata = dev->platform_data; |
| struct resource *res; |
| struct usb_hcd *hcd; |
| void __iomem *regs; |
| struct ehci_hcd *omap_ehci; |
| int ret = -ENODEV; |
| int irq; |
| int i; |
| char supply[7]; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| if (!dev->parent) { |
| dev_err(dev, "Missing parent device\n"); |
| return -ENODEV; |
| } |
| |
| irq = platform_get_irq_byname(pdev, "ehci-irq"); |
| if (irq < 0) { |
| dev_err(dev, "EHCI irq failed\n"); |
| return -ENODEV; |
| } |
| |
| res = platform_get_resource_byname(pdev, |
| IORESOURCE_MEM, "ehci"); |
| if (!res) { |
| dev_err(dev, "UHH EHCI get resource failed\n"); |
| return -ENODEV; |
| } |
| |
| regs = ioremap(res->start, resource_size(res)); |
| if (!regs) { |
| dev_err(dev, "UHH EHCI ioremap failed\n"); |
| return -ENOMEM; |
| } |
| |
| hcd = usb_create_hcd(&ehci_omap_hc_driver, dev, |
| dev_name(dev)); |
| if (!hcd) { |
| dev_err(dev, "failed to create hcd with err %d\n", ret); |
| ret = -ENOMEM; |
| goto err_io; |
| } |
| |
| hcd->rsrc_start = res->start; |
| hcd->rsrc_len = resource_size(res); |
| hcd->regs = regs; |
| |
| /* get ehci regulator and enable */ |
| for (i = 0 ; i < OMAP3_HS_USB_PORTS ; i++) { |
| if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY) { |
| pdata->regulator[i] = NULL; |
| continue; |
| } |
| snprintf(supply, sizeof(supply), "hsusb%d", i); |
| pdata->regulator[i] = regulator_get(dev, supply); |
| if (IS_ERR(pdata->regulator[i])) { |
| pdata->regulator[i] = NULL; |
| dev_dbg(dev, |
| "failed to get ehci port%d regulator\n", i); |
| } else { |
| regulator_enable(pdata->regulator[i]); |
| } |
| } |
| |
| ret = omap_usbhs_enable(dev); |
| if (ret) { |
| dev_err(dev, "failed to start usbhs with err %d\n", ret); |
| goto err_enable; |
| } |
| |
| /* |
| * 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); |
| |
| /* Soft reset the PHY using PHY reset command over ULPI */ |
| if (pdata->port_mode[0] == OMAP_EHCI_PORT_MODE_PHY) |
| omap_ehci_soft_phy_reset(pdev, 0); |
| if (pdata->port_mode[1] == OMAP_EHCI_PORT_MODE_PHY) |
| omap_ehci_soft_phy_reset(pdev, 1); |
| |
| omap_ehci = hcd_to_ehci(hcd); |
| omap_ehci->sbrn = 0x20; |
| |
| /* we know this is the memory we want, no need to ioremap again */ |
| omap_ehci->caps = hcd->regs; |
| omap_ehci->regs = hcd->regs |
| + HC_LENGTH(readl(&omap_ehci->caps->hc_capbase)); |
| |
| dbg_hcs_params(omap_ehci, "reset"); |
| dbg_hcc_params(omap_ehci, "reset"); |
| |
| /* cache this readonly data; minimize chip reads */ |
| omap_ehci->hcs_params = readl(&omap_ehci->caps->hcs_params); |
| |
| ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); |
| if (ret) { |
| dev_err(dev, "failed to add hcd with err %d\n", ret); |
| goto err_add_hcd; |
| } |
| |
| /* root ports should always stay powered */ |
| ehci_port_power(omap_ehci, 1); |
| |
| return 0; |
| |
| err_add_hcd: |
| omap_usbhs_disable(dev); |
| |
| err_enable: |
| usb_put_hcd(hcd); |
| |
| err_io: |
| 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); |
| |
| usb_remove_hcd(hcd); |
| omap_usbhs_disable(dev); |
| usb_put_hcd(hcd); |
| return 0; |
| } |
| |
| static void ehci_hcd_omap_shutdown(struct platform_device *pdev) |
| { |
| struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev); |
| |
| if (hcd->driver->shutdown) |
| hcd->driver->shutdown(hcd); |
| } |
| |
| static struct platform_driver ehci_hcd_omap_driver = { |
| .probe = ehci_hcd_omap_probe, |
| .remove = ehci_hcd_omap_remove, |
| .shutdown = ehci_hcd_omap_shutdown, |
| /*.suspend = ehci_hcd_omap_suspend, */ |
| /*.resume = ehci_hcd_omap_resume, */ |
| .driver = { |
| .name = "ehci-omap", |
| } |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static const struct hc_driver ehci_omap_hc_driver = { |
| .description = hcd_name, |
| .product_desc = "OMAP-EHCI Host Controller", |
| .hcd_priv_size = sizeof(struct ehci_hcd), |
| |
| /* |
| * generic hardware linkage |
| */ |
| .irq = ehci_irq, |
| .flags = HCD_MEMORY | HCD_USB2, |
| |
| /* |
| * basic lifecycle operations |
| */ |
| .reset = ehci_init, |
| .start = ehci_run, |
| .stop = ehci_stop, |
| .shutdown = ehci_shutdown, |
| |
| /* |
| * managing i/o requests and associated device resources |
| */ |
| .urb_enqueue = ehci_urb_enqueue, |
| .urb_dequeue = ehci_urb_dequeue, |
| .endpoint_disable = ehci_endpoint_disable, |
| .endpoint_reset = ehci_endpoint_reset, |
| |
| /* |
| * scheduling support |
| */ |
| .get_frame_number = ehci_get_frame, |
| |
| /* |
| * root hub support |
| */ |
| .hub_status_data = ehci_hub_status_data, |
| .hub_control = ehci_hub_control, |
| .bus_suspend = ehci_bus_suspend, |
| .bus_resume = ehci_bus_resume, |
| |
| .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
| }; |
| |
| MODULE_ALIAS("platform:omap-ehci"); |
| MODULE_AUTHOR("Texas Instruments, Inc."); |
| MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>"); |
| |