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>
diff --git a/drivers/usb/host/ohci-tilegx.c b/drivers/usb/host/ohci-tilegx.c
new file mode 100644
index 0000000..1ae7b28
--- /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");