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
......@@ -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---
......
......@@ -19,3 +19,4 @@ obj-$(CONFIG_PCI) += pci_gx.o
else
obj-$(CONFIG_PCI) += pci.o
endif
obj-$(CONFIG_TILE_USB) += usb.o
/*
* 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);
......@@ -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
......
/*
* 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");
......@@ -1100,6 +1100,11 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ohci_octeon_driver
#endif
#ifdef CONFIG_TILE_USB
#include "ohci-tilegx.c"
#define PLATFORM_DRIVER ohci_hcd_tilegx_driver
#endif
#ifdef CONFIG_USB_CNS3XXX_OHCI
#include "ohci-cns3xxx.c"
#define PLATFORM_DRIVER ohci_hcd_cns3xxx_driver
......
/*
* 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 OHCI 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_ohc(void)
{
}
static void tilegx_stop_ohc(void)
{
}
static int tilegx_ohci_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
ret = ohci_init(ohci);
if (ret < 0)
return ret;
ret = ohci_run(ohci);
if (ret < 0) {
dev_err(hcd->self.controller, "can't start %s\n",
hcd->self.bus_name);
ohci_stop(hcd);
return ret;
}
return 0;
}
static const struct hc_driver ohci_tilegx_hc_driver = {
.description = hcd_name,
.product_desc = "Tile-Gx OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* Generic hardware linkage.
*/
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
/*
* Basic lifecycle operations.
*/
.start = tilegx_ohci_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* Managing I/O requests and associated device resources.
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* Scheduling support.
*/
.get_frame_number = ohci_get_frame,
/*
* Root hub support.
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
.start_port_reset = ohci_start_port_reset,
};
static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
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, 0) != 0)
return -ENXIO;
hcd = usb_create_hcd(&ohci_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_ohc();
/* 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;
}
ohci_hcd_init(hcd_to_ohci(hcd));
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_ohc();
usb_put_hcd(hcd);
gxio_usb_host_destroy(&pdata->usb_ctx);
return ret;
}
static int ohci_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_ohc();
gxio_usb_host_destroy(&pdata->usb_ctx);
destroy_irq(pdata->irq);
platform_set_drvdata(pdev, NULL);
return 0;
}
static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
{
usb_hcd_platform_shutdown(pdev);
ohci_hcd_tilegx_drv_remove(pdev);
}
static struct platform_driver ohci_hcd_tilegx_driver = {
.probe = ohci_hcd_tilegx_drv_probe,
.remove = ohci_hcd_tilegx_drv_remove,
.shutdown = ohci_hcd_tilegx_drv_shutdown,
.driver = {
.name = "tilegx-ohci",
.owner = THIS_MODULE,
}
};
MODULE_ALIAS("platform:tilegx-ohci");
/*
* 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.
*
* Structure to contain platform-specific data related to Tile-Gx USB
* controllers.
*/
#ifndef _LINUX_USB_TILEGX_H
#define _LINUX_USB_TILEGX_H
#include <gxio/usb_host.h>
struct tilegx_usb_platform_data {
/* GXIO device index. */
int dev_index;
/* GXIO device context. */
gxio_usb_host_context_t usb_ctx;
/* Device IRQ. */
unsigned int irq;
};
#endif /* _LINUX_USB_TILEGX_H */
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