1/*
2 * Copyright 2012 Tilera Corporation. All Rights Reserved.
3 *
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.
7 *
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
12 *   more details.
13 */
14
15/*
16 * Tilera TILE-Gx USB EHCI host controller driver.
17 */
18
19#include <linux/irq.h>
20#include <linux/platform_device.h>
21#include <linux/usb/tilegx.h>
22#include <linux/usb.h>
23
24#include <asm/homecache.h>
25
26#include <gxio/iorpc_usb_host.h>
27#include <gxio/usb_host.h>
28
29static void tilegx_start_ehc(void)
30{
31}
32
33static void tilegx_stop_ehc(void)
34{
35}
36
37static int tilegx_ehci_setup(struct usb_hcd *hcd)
38{
39	int ret = ehci_init(hcd);
40
41	/*
42	 * Some drivers do:
43	 *
44	 *   struct ehci_hcd *ehci = hcd_to_ehci(hcd);
45	 *   ehci->need_io_watchdog = 0;
46	 *
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.
50	 */
51
52	return ret;
53}
54
55static 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),
59
60	/*
61	 * Generic hardware linkage.
62	 */
63	.irq			= ehci_irq,
64	.flags			= HCD_MEMORY | HCD_USB2 | HCD_BH,
65
66	/*
67	 * Basic lifecycle operations.
68	 */
69	.reset			= tilegx_ehci_setup,
70	.start			= ehci_run,
71	.stop			= ehci_stop,
72	.shutdown		= ehci_shutdown,
73
74	/*
75	 * Managing I/O requests and associated device resources.
76	 */
77	.urb_enqueue		= ehci_urb_enqueue,
78	.urb_dequeue		= ehci_urb_dequeue,
79	.endpoint_disable	= ehci_endpoint_disable,
80	.endpoint_reset		= ehci_endpoint_reset,
81
82	/*
83	 * Scheduling support.
84	 */
85	.get_frame_number	= ehci_get_frame,
86
87	/*
88	 * Root hub support.
89	 */
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,
96
97	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
98};
99
100static int ehci_hcd_tilegx_drv_probe(struct platform_device *pdev)
101{
102	struct usb_hcd *hcd;
103	struct ehci_hcd *ehci;
104	struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
105	pte_t pte = { 0 };
106	int my_cpu = smp_processor_id();
107	int ret;
108
109	if (usb_disabled())
110		return -ENODEV;
111
112	/*
113	 * Try to initialize our GXIO context; if we can't, the device
114	 * doesn't exist.
115	 */
116	if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 1) != 0)
117		return -ENXIO;
118
119	hcd = usb_create_hcd(&ehci_tilegx_hc_driver, &pdev->dev,
120			     dev_name(&pdev->dev));
121	if (!hcd) {
122          ret = -ENOMEM;
123          goto err_hcd;
124        }
125
126	/*
127	 * We don't use rsrc_start to map in our registers, but seems like
128	 * we ought to set it to something, so we use the register VA.
129	 */
130	hcd->rsrc_start =
131		(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
132	hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
133	hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
134
135	tilegx_start_ehc();
136
137	ehci = hcd_to_ehci(hcd);
138	ehci->caps = hcd->regs;
139	ehci->regs =
140		hcd->regs + HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
141	/* cache this readonly data; minimize chip reads */
142	ehci->hcs_params = readl(&ehci->caps->hcs_params);
143
144	/* Create our IRQs and register them. */
145	pdata->irq = irq_alloc_hwirq(-1);
146	if (!pdata->irq) {
147		ret = -ENXIO;
148		goto err_no_irq;
149	}
150
151	tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
152
153	/* Configure interrupts. */
154	ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
155					  cpu_x(my_cpu), cpu_y(my_cpu),
156					  KERNEL_PL, pdata->irq);
157	if (ret) {
158		ret = -ENXIO;
159		goto err_have_irq;
160	}
161
162	/* Register all of our memory. */
163	pte = pte_set_home(pte, PAGE_HOME_HASH);
164	ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
165	if (ret) {
166		ret = -ENXIO;
167		goto err_have_irq;
168	}
169
170	ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
171	if (ret == 0) {
172		platform_set_drvdata(pdev, hcd);
173		device_wakeup_enable(hcd->self.controller);
174		return ret;
175	}
176
177err_have_irq:
178	irq_free_hwirq(pdata->irq);
179err_no_irq:
180	tilegx_stop_ehc();
181	usb_put_hcd(hcd);
182err_hcd:
183	gxio_usb_host_destroy(&pdata->usb_ctx);
184	return ret;
185}
186
187static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
188{
189	struct usb_hcd *hcd = platform_get_drvdata(pdev);
190	struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
191
192	usb_remove_hcd(hcd);
193	usb_put_hcd(hcd);
194	tilegx_stop_ehc();
195	gxio_usb_host_destroy(&pdata->usb_ctx);
196	irq_free_hwirq(pdata->irq);
197
198	return 0;
199}
200
201static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
202{
203	usb_hcd_platform_shutdown(pdev);
204	ehci_hcd_tilegx_drv_remove(pdev);
205}
206
207static struct platform_driver ehci_hcd_tilegx_driver = {
208	.probe		= ehci_hcd_tilegx_drv_probe,
209	.remove		= ehci_hcd_tilegx_drv_remove,
210	.shutdown	= ehci_hcd_tilegx_drv_shutdown,
211	.driver = {
212		.name	= "tilegx-ehci",
213	}
214};
215
216MODULE_ALIAS("platform:tilegx-ehci");
217