2 * Copyright 2012 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
16 * Tilera TILE-Gx USB EHCI host controller driver.
19 #include <linux/irq.h>
20 #include <linux/platform_device.h>
21 #include <linux/usb/tilegx.h>
22 #include <linux/usb.h>
24 #include <asm/homecache.h>
26 #include <gxio/iorpc_usb_host.h>
27 #include <gxio/usb_host.h>
29 static void tilegx_start_ehc(void)
33 static void tilegx_stop_ehc(void)
37 static int tilegx_ehci_setup(struct usb_hcd *hcd)
39 int ret = ehci_init(hcd);
44 * struct ehci_hcd *ehci = hcd_to_ehci(hcd);
45 * ehci->need_io_watchdog = 0;
47 * here, but since this is a new driver we're going to leave the
48 * watchdog enabled. Later we may try to turn it off and see
49 * whether we run into any problems.
55 static const struct hc_driver ehci_tilegx_hc_driver = {
56 .description = hcd_name,
57 .product_desc = "Tile-Gx EHCI",
58 .hcd_priv_size = sizeof(struct ehci_hcd),
61 * Generic hardware linkage.
64 .flags = HCD_MEMORY | HCD_USB2,
67 * Basic lifecycle operations.
69 .reset = tilegx_ehci_setup,
72 .shutdown = ehci_shutdown,
75 * Managing I/O requests and associated device resources.
77 .urb_enqueue = ehci_urb_enqueue,
78 .urb_dequeue = ehci_urb_dequeue,
79 .endpoint_disable = ehci_endpoint_disable,
80 .endpoint_reset = ehci_endpoint_reset,
85 .get_frame_number = ehci_get_frame,
90 .hub_status_data = ehci_hub_status_data,
91 .hub_control = ehci_hub_control,
92 .bus_suspend = ehci_bus_suspend,
93 .bus_resume = ehci_bus_resume,
94 .relinquish_port = ehci_relinquish_port,
95 .port_handed_over = ehci_port_handed_over,
97 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
100 static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)
103 struct ehci_hcd *ehci;
104 struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
106 int my_cpu = smp_processor_id();
113 * Try to initialize our GXIO context; if we can't, the device
116 if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)
119 hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,
120 dev_name(&pdev->dev));
125 * We don't use rsrc_start to map in our registers, but seems like
126 * we ought to set it to something, so we use the register VA.
129 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
130 hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
131 hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
135 ehci = hcd_to_ehci(hcd);
136 ehci->caps = hcd->regs;
138 hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
139 /* cache this readonly data; minimize chip reads */
140 ehci->hcs_params = readl(&ehci->caps->hcs_params);
142 /* Create our IRQs and register them. */
143 pdata->irq = create_irq();
144 if (pdata->irq < 0) {
149 tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
151 /* Configure interrupts. */
152 ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
153 cpu_x(my_cpu), cpu_y(my_cpu),
154 KERNEL_PL, pdata->irq);
160 /* Register all of our memory. */
161 pte = pte_set_home(pte, PAGE_HOME_HASH);
162 ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
168 ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
170 platform_set_drvdata(pdev, hcd);
175 destroy_irq(pdata->irq);
179 gxio_usb_host_destroy(&pdata->usb_ctx);
183 static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
185 struct usb_hcd *hcd = platform_get_drvdata(pdev);
186 struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
191 gxio_usb_host_destroy(&pdata->usb_ctx);
192 destroy_irq(pdata->irq);
193 platform_set_drvdata(pdev, NULL);
198 static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
200 usb_hcd_platform_shutdown(pdev);
201 ehci_hcd_tilegx_drv_remove(pdev);
204 static struct platform_driver ehci_hcd_tilegx_driver = {
205 .probe = ehci_hcd_tilegx_drv_probe,
206 .remove = ehci_hcd_tilegx_drv_remove,
207 .shutdown = ehci_hcd_tilegx_drv_shutdown,
209 .name = "tilegx-ehci",
210 .owner = THIS_MODULE,
214 MODULE_ALIAS("platform:tilegx-ehci");