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>

4 files changed, 427 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 800be38c78b4..1d9401e0990a 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 000000000000..1d215cdb9dea
--- /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 e0adf5c0cf55..2b1e8d84c873 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 000000000000..1ae7b28a71c2
--- /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");