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authorChris Metcalf <cmetcalf@tilera.com>2012-05-09 13:58:14 -0400
committerChris Metcalf <cmetcalf@tilera.com>2012-07-18 16:40:29 -0400
commit47fc28bff82a4dd5f6b41c97e335d10fc78a8e9a (patch)
tree829b845956f9f5f6b2997424fa1d6d72244b0d1b
parentd1cc1732cc62034542b042a4506d7c5043bc5e5e (diff)
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: Chris Metcalf <cmetcalf@tilera.com>
-rw-r--r--arch/tile/Kconfig10
-rw-r--r--arch/tile/kernel/Makefile1
-rw-r--r--arch/tile/kernel/usb.c69
-rw-r--r--drivers/usb/host/ehci-hcd.c5
-rw-r--r--drivers/usb/host/ehci-tilegx.c214
-rw-r--r--drivers/usb/host/ohci-hcd.c5
-rw-r--r--drivers/usb/host/ohci-tilegx.c203
-rw-r--r--include/linux/usb/tilegx.h34
8 files changed, 541 insertions, 0 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 557e3a381ca..cf4bb69ea8e 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -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---
diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index 49d4ce3cd7f..5334be8e253 100644
--- a/arch/tile/kernel/Makefile
+++ b/arch/tile/kernel/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_PCI) += pci_gx.o
else
obj-$(CONFIG_PCI) += pci.o
endif
+obj-$(CONFIG_TILE_USB) += usb.o
diff --git a/arch/tile/kernel/usb.c b/arch/tile/kernel/usb.c
new file mode 100644
index 00000000000..5af8debc6a7
--- /dev/null
+++ b/arch/tile/kernel/usb.c
@@ -0,0 +1,69 @@
+/*
+ * 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);
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 800be38c78b..1d9401e0990 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -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
diff --git a/drivers/usb/host/ehci-tilegx.c b/drivers/usb/host/ehci-tilegx.c
new file mode 100644
index 00000000000..1d215cdb9de
--- /dev/null
+++ b/drivers/usb/host/ehci-tilegx.c
@@ -0,0 +1,214 @@
+/*
+ * 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");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index e0adf5c0cf5..2b1e8d84c87 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -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
diff --git a/drivers/usb/host/ohci-tilegx.c b/drivers/usb/host/ohci-tilegx.c
new file mode 100644
index 00000000000..1ae7b28a71c
--- /dev/null
+++ b/drivers/usb/host/ohci-tilegx.c
@@ -0,0 +1,203 @@
+/*
+ * 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");
diff --git a/include/linux/usb/tilegx.h b/include/linux/usb/tilegx.h
new file mode 100644
index 00000000000..2d65e343568
--- /dev/null
+++ b/include/linux/usb/tilegx.h
@@ -0,0 +1,34 @@
+/*
+ * 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 */