diff options
| -rw-r--r-- | Documentation/powerpc/dts-bindings/xilinx.txt | 11 | ||||
| -rw-r--r-- | drivers/usb/host/Kconfig | 15 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 5 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-xilinx-of.c | 300 |
4 files changed, 329 insertions, 2 deletions
diff --git a/Documentation/powerpc/dts-bindings/xilinx.txt b/Documentation/powerpc/dts-bindings/xilinx.txt index 80339fe4300..ea68046bb9c 100644 --- a/Documentation/powerpc/dts-bindings/xilinx.txt +++ b/Documentation/powerpc/dts-bindings/xilinx.txt @@ -292,4 +292,15 @@ - reg-offset : A value of 3 is required - reg-shift : A value of 2 is required + vii) Xilinx USB Host controller + + The Xilinx USB host controller is EHCI compatible but with a different + base address for the EHCI registers, and it is always a big-endian + USB Host controller. The hardware can be configured as high speed only, + or high speed/full speed hybrid. + + Required properties: + - xlnx,support-usb-fs: A value 0 means the core is built as high speed + only. A value 1 means the core also supports + full speed devices. diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 9b43b226817..6d97e039cdb 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -90,14 +90,25 @@ config USB_EHCI_TT_NEWSCHED config USB_EHCI_BIG_ENDIAN_MMIO bool - depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || ARCH_IXP4XX) + depends on USB_EHCI_HCD && (PPC_CELLEB || PPC_PS3 || 440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX) default y config USB_EHCI_BIG_ENDIAN_DESC bool - depends on USB_EHCI_HCD && (440EPX || ARCH_IXP4XX) + depends on USB_EHCI_HCD && (440EPX || ARCH_IXP4XX || XPS_USB_HCD_XILINX) default y +config XPS_USB_HCD_XILINX + bool "Use Xilinx usb host EHCI controller core" + depends on USB_EHCI_HCD && (PPC32 || MICROBLAZE) + select USB_EHCI_BIG_ENDIAN_DESC + select USB_EHCI_BIG_ENDIAN_MMIO + ---help--- + Xilinx xps USB host controller core is EHCI compilant and has + transaction translator built-in. It can be configured to either + support both high speed and full speed devices, or high speed + devices only. + config USB_EHCI_FSL bool "Support for Freescale on-chip EHCI USB controller" depends on USB_EHCI_HCD && FSL_SOC diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index d8f4aaa616f..e2afb2b5faf 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -1120,6 +1120,11 @@ MODULE_LICENSE ("GPL"); #define OF_PLATFORM_DRIVER ehci_hcd_ppc_of_driver #endif +#ifdef CONFIG_XPS_USB_HCD_XILINX +#include "ehci-xilinx-of.c" +#define OF_PLATFORM_DRIVER ehci_hcd_xilinx_of_driver +#endif + #ifdef CONFIG_PLAT_ORION #include "ehci-orion.c" #define PLATFORM_DRIVER ehci_orion_driver diff --git a/drivers/usb/host/ehci-xilinx-of.c b/drivers/usb/host/ehci-xilinx-of.c new file mode 100644 index 00000000000..a5861531ad3 --- /dev/null +++ b/drivers/usb/host/ehci-xilinx-of.c @@ -0,0 +1,300 @@ +/* + * EHCI HCD (Host Controller Driver) for USB. + * + * Bus Glue for Xilinx EHCI core on the of_platform bus + * + * Copyright (c) 2009 Xilinx, Inc. + * + * Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com> + * and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> + * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> + * + * 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 <linux/signal.h> + +#include <linux/of.h> +#include <linux/of_platform.h> + +/** + * ehci_xilinx_of_setup - Initialize the device for ehci_reset() + * @hcd: Pointer to the usb_hcd device to which the host controller bound + * + * called during probe() after chip reset completes. + */ +static int ehci_xilinx_of_setup(struct usb_hcd *hcd) +{ + struct ehci_hcd *ehci = hcd_to_ehci(hcd); + int retval; + + retval = ehci_halt(ehci); + if (retval) + return retval; + + retval = ehci_init(hcd); + if (retval) + return retval; + + ehci->sbrn = 0x20; + + return ehci_reset(ehci); +} + +/** + * ehci_xilinx_port_handed_over - hand the port out if failed to enable it + * @hcd: Pointer to the usb_hcd device to which the host controller bound + * @portnum:Port number to which the device is attached. + * + * This function is used as a place to tell the user that the Xilinx USB host + * controller does support LS devices. And in an HS only configuration, it + * does not support FS devices either. It is hoped that this can help a + * confused user. + * + * There are cases when the host controller fails to enable the port due to, + * for example, insufficient power that can be supplied to the device from + * the USB bus. In those cases, the messages printed here are not helpful. + */ +static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum) +{ + dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum); + if (hcd->has_tt) { + dev_warn(hcd->self.controller, + "Maybe you have connected a low speed device?\n"); + + dev_warn(hcd->self.controller, + "We do not support low speed devices\n"); + } else { + dev_warn(hcd->self.controller, + "Maybe your device is not a high speed device?\n"); + dev_warn(hcd->self.controller, + "The USB host controller does not support full speed " + "nor low speed devices\n"); + dev_warn(hcd->self.controller, + "You can reconfigure the host controller to have " + "full speed support\n"); + } + + return 0; +} + + +static const struct hc_driver ehci_xilinx_of_hc_driver = { + .description = hcd_name, + .product_desc = "OF EHCI", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_MEMORY | HCD_USB2, + + /* + * basic lifecycle operations + */ + .reset = ehci_xilinx_of_setup, + .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, + + /* + * scheduling support + */ + .get_frame_number = ehci_get_frame, + + /* + * root hub support + */ + .hub_status_data = ehci_hub_status_data, + .hub_control = ehci_hub_control, +#ifdef CONFIG_PM + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, +#endif + .relinquish_port = NULL, + .port_handed_over = ehci_xilinx_port_handed_over, + + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +}; + +/** + * ehci_hcd_xilinx_of_probe - Probe method for the USB host controller + * @op: pointer to the of_device to which the host controller bound + * @match: pointer to of_device_id structure, not used + * + * This function requests resources and sets up appropriate properties for the + * host controller. Because the Xilinx USB host controller can be configured + * as HS only or HS/FS only, it checks the configuration in the device tree + * entry, and sets an appropriate value for hcd->has_tt. + */ +static int __devinit +ehci_hcd_xilinx_of_probe(struct of_device *op, const struct of_device_id *match) +{ + struct device_node *dn = op->node; + struct usb_hcd *hcd; + struct ehci_hcd *ehci; + struct resource res; + int irq; + int rv; + int *value; + + if (usb_disabled()) + return -ENODEV; + + dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n"); + + rv = of_address_to_resource(dn, 0, &res); + if (rv) + return rv; + + hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev, + "XILINX-OF USB"); + if (!hcd) + return -ENOMEM; + + hcd->rsrc_start = res.start; + hcd->rsrc_len = res.end - res.start + 1; + + if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { + printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); + rv = -EBUSY; + goto err_rmr; + } + + irq = irq_of_parse_and_map(dn, 0); + if (irq == NO_IRQ) { + printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); + rv = -EBUSY; + goto err_irq; + } + + hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); + if (!hcd->regs) { + printk(KERN_ERR __FILE__ ": ioremap failed\n"); + rv = -ENOMEM; + goto err_ioremap; + } + + ehci = hcd_to_ehci(hcd); + + /* This core always has big-endian register interface and uses + * big-endian memory descriptors. + */ + ehci->big_endian_mmio = 1; + ehci->big_endian_desc = 1; + + /* Check whether the FS support option is selected in the hardware. + */ + value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL); + if (value && (*value == 1)) { + ehci_dbg(ehci, "USB host controller supports FS devices\n"); + hcd->has_tt = 1; + } else { + ehci_dbg(ehci, + "USB host controller is HS only\n"); + hcd->has_tt = 0; + } + + /* Debug registers are at the first 0x100 region + */ + ehci->caps = hcd->regs + 0x100; + ehci->regs = hcd->regs + 0x100 + + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); + + /* cache this readonly data; minimize chip reads */ + ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); + + rv = usb_add_hcd(hcd, irq, 0); + if (rv == 0) + return 0; + + iounmap(hcd->regs); + +err_ioremap: +err_irq: + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); +err_rmr: + usb_put_hcd(hcd); + + return rv; +} + +/** + * ehci_hcd_xilinx_of_remove - shutdown hcd and release resources + * @op: pointer to of_device structure that is to be removed + * + * Remove the hcd structure, and release resources that has been requested + * during probe. + */ +static int ehci_hcd_xilinx_of_remove(struct of_device *op) +{ + struct usb_hcd *hcd = dev_get_drvdata(&op->dev); + dev_set_drvdata(&op->dev, NULL); + + dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n"); + + usb_remove_hcd(hcd); + + iounmap(hcd->regs); + release_mem_region(hcd->rsrc_start, hcd->rsrc_len); + + usb_put_hcd(hcd); + + return 0; +} + +/** + * ehci_hcd_xilinx_of_shutdown - shutdown the hcd + * @op: pointer to of_device structure that is to be removed + * + * Properly shutdown the hcd, call driver's shutdown routine. + */ +static int ehci_hcd_xilinx_of_shutdown(struct of_device *op) +{ + struct usb_hcd *hcd = dev_get_drvdata(&op->dev); + + if (hcd->driver->shutdown) + hcd->driver->shutdown(hcd); + + return 0; +} + + +static struct of_device_id ehci_hcd_xilinx_of_match[] = { + {.compatible = "xlnx,xps-usb-host-1.00.a",}, + {}, +}; +MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match); + +static struct of_platform_driver ehci_hcd_xilinx_of_driver = { + .name = "xilinx-of-ehci", + .match_table = ehci_hcd_xilinx_of_match, + .probe = ehci_hcd_xilinx_of_probe, + .remove = ehci_hcd_xilinx_of_remove, + .shutdown = ehci_hcd_xilinx_of_shutdown, + .driver = { + .name = "xilinx-of-ehci", + .owner = THIS_MODULE, + }, +}; |