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Commit 47fc28bf authored by Chris Metcalf's avatar Chris Metcalf
Browse files

usb: add host support for the tilegx architecture 



This change adds OHCI and EHCI support for the tilegx's on-chip
USB hardware.

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent d1cc1732

arch/tile/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -396,6 +396,16 @@ config NO_IOPORT 


source "drivers/pci/Kconfig"



config TILE_USB

	tristate "Tilera USB host adapter support"

	default y

	depends on USB

	depends on TILEGX

	select TILE_GXIO_USB_HOST

	---help---

	  Provides USB host adapter support for the built-in EHCI and OHCI

	  interfaces on TILE-Gx chips.



config HOTPLUG

	bool "Support for hot-pluggable devices"

	---help---

arch/tile/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -19,3 +19,4 @@ obj-$(CONFIG_PCI) += pci_gx.o 
else

obj-$(CONFIG_PCI)		+= pci.o

endif

obj-$(CONFIG_TILE_USB)		+= usb.o

arch/tile/kernel/usb.c

0 → 100644
+69 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2012 Tilera Corporation. All Rights Reserved.

 *

 *   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, version 2.

 *

 *   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, GOOD TITLE or

 *   NON INFRINGEMENT.  See the GNU General Public License for

 *   more details.

 *

 * Register the Tile-Gx USB interfaces as platform devices.

 *

 * The actual USB driver is just some glue (in

 * drivers/usb/host/[eo]hci-tilegx.c) which makes the registers available

 * to the standard kernel EHCI and OHCI drivers.

 */



#include <linux/dma-mapping.h>

#include <linux/platform_device.h>

#include <linux/usb/tilegx.h>

#include <linux/types.h>



static u64 ehci_dmamask = DMA_BIT_MASK(32);



#define USB_HOST_DEF(unit, type, dmamask) \

	static struct \

	    tilegx_usb_platform_data tilegx_usb_platform_data_ ## type ## \

		hci ## unit = { \

		.dev_index = unit, \

	}; \

	\

	static struct platform_device tilegx_usb_ ## type ## hci ## unit = { \

		.name		= "tilegx-" #type "hci", \

		.id		= unit, \

		.dev = { \

			.dma_mask		= dmamask, \

			.coherent_dma_mask	= DMA_BIT_MASK(32), \

			.platform_data = \

				&tilegx_usb_platform_data_ ## type ## hci ## \

				unit, \

		}, \

	};



USB_HOST_DEF(0, e, &ehci_dmamask)

USB_HOST_DEF(0, o, NULL)

USB_HOST_DEF(1, e, &ehci_dmamask)

USB_HOST_DEF(1, o, NULL)



#undef USB_HOST_DEF



static struct platform_device *tilegx_usb_devices[] __initdata = {

	&tilegx_usb_ehci0,

	&tilegx_usb_ehci1,

	&tilegx_usb_ohci0,

	&tilegx_usb_ohci1,

};



/** Add our set of possible USB devices. */

static int __init tilegx_usb_init(void)

{

	platform_add_devices(tilegx_usb_devices,

			     ARRAY_SIZE(tilegx_usb_devices));



	return 0;

}

arch_initcall(tilegx_usb_init);

drivers/usb/host/ehci-hcd.c

+5 −0
Original line number Diff line number Diff line
@@ -1349,6 +1349,11 @@ MODULE_LICENSE ("GPL"); 
#define PLATFORM_DRIVER		ehci_msm_driver

#endif



#ifdef CONFIG_TILE_USB

#include "ehci-tilegx.c"

#define	PLATFORM_DRIVER		ehci_hcd_tilegx_driver

#endif



#ifdef CONFIG_USB_EHCI_HCD_PMC_MSP

#include "ehci-pmcmsp.c"

#define	PLATFORM_DRIVER		ehci_hcd_msp_driver

drivers/usb/host/ehci-tilegx.c

0 → 100644
+214 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2012 Tilera Corporation. All Rights Reserved.

 *

 *   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, version 2.

 *

 *   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, GOOD TITLE or

 *   NON INFRINGEMENT.  See the GNU General Public License for

 *   more details.

 */



/*

 * Tilera TILE-Gx USB EHCI host controller driver.

 */



#include <linux/irq.h>

#include <linux/platform_device.h>

#include <linux/usb/tilegx.h>

#include <linux/usb.h>



#include <asm/homecache.h>



#include <gxio/iorpc_usb_host.h>

#include <gxio/usb_host.h>



static void tilegx_start_ehc(void)

{

}



static void tilegx_stop_ehc(void)

{

}



static int tilegx_ehci_setup(struct usb_hcd *hcd)

{

	int ret = ehci_init(hcd);



	/*

	 * Some drivers do:

	 *

	 *   struct ehci_hcd *ehci = hcd_to_ehci(hcd);

	 *   ehci->need_io_watchdog = 0;

	 *

	 * here, but since this is a new driver we're going to leave the

	 * watchdog enabled.  Later we may try to turn it off and see

	 * whether we run into any problems.

	 */



	return ret;

}



static const struct hc_driver ehci_tilegx_hc_driver = {

	.description		= hcd_name,

	.product_desc		= "Tile-Gx EHCI",

	.hcd_priv_size		= sizeof(struct ehci_hcd),



	/*

	 * Generic hardware linkage.

	 */

	.irq			= ehci_irq,

	.flags			= HCD_MEMORY | HCD_USB2,



	/*

	 * Basic lifecycle operations.

	 */

	.reset			= tilegx_ehci_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,

	.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,

	.relinquish_port	= ehci_relinquish_port,

	.port_handed_over	= ehci_port_handed_over,



	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,

};



static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)

{

	struct usb_hcd *hcd;

	struct ehci_hcd *ehci;

	struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;

	pte_t pte = { 0 };

	int my_cpu = smp_processor_id();

	int ret;



	if (usb_disabled())

		return -ENODEV;



	/*

	 * Try to initialize our GXIO context; if we can't, the device

	 * doesn't exist.

	 */

	if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)

		return -ENXIO;



	hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,

			     dev_name(&pdev->dev));

	if (!hcd)

		return -ENOMEM;



	/*

	 * We don't use rsrc_start to map in our registers, but seems like

	 * we ought to set it to something, so we use the register VA.

	 */

	hcd->rsrc_start =

		(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);

	hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);

	hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);



	tilegx_start_ehc();



	ehci = hcd_to_ehci(hcd);

	ehci->caps = hcd->regs;

	ehci->regs =

		hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));

	/* cache this readonly data; minimize chip reads */

	ehci->hcs_params = readl(&ehci->caps->hcs_params);



	/* Create our IRQs and register them. */

	pdata->irq = create_irq();

	if (pdata->irq < 0) {

		ret = -ENXIO;

		goto err_no_irq;

	}



	tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);



	/* Configure interrupts. */

	ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,

					  cpu_x(my_cpu), cpu_y(my_cpu),

					  KERNEL_PL, pdata->irq);

	if (ret) {

		ret = -ENXIO;

		goto err_have_irq;

	}



	/* Register all of our memory. */

	pte = pte_set_home(pte, PAGE_HOME_HASH);

	ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);

	if (ret) {

		ret = -ENXIO;

		goto err_have_irq;

	}



	ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);

	if (ret == 0) {

		platform_set_drvdata(pdev, hcd);

		return ret;

	}



err_have_irq:

	destroy_irq(pdata->irq);

err_no_irq:

	tilegx_stop_ehc();

	usb_put_hcd(hcd);

	gxio_usb_host_destroy(&pdata->usb_ctx);

	return ret;

}



static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)

{

	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;



	usb_remove_hcd(hcd);

	usb_put_hcd(hcd);

	tilegx_stop_ehc();

	gxio_usb_host_destroy(&pdata->usb_ctx);

	destroy_irq(pdata->irq);

	platform_set_drvdata(pdev, NULL);



	return 0;

}



static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)

{

	usb_hcd_platform_shutdown(pdev);

	ehci_hcd_tilegx_drv_remove(pdev);

}



static struct platform_driver ehci_hcd_tilegx_driver = {

	.probe		= ehci_hcd_tilegx_drv_probe,

	.remove		= ehci_hcd_tilegx_drv_remove,

	.shutdown	= ehci_hcd_tilegx_drv_shutdown,

	.driver = {

		.name	= "tilegx-ehci",

		.owner	= THIS_MODULE,

	}

};



MODULE_ALIAS("platform:tilegx-ehci");