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 OHCI 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_ohc(void)
30{
31}
32
33static void tilegx_stop_ohc(void)
34{
35}
36
37static int tilegx_ohci_start(struct usb_hcd *hcd)
38{
39	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
40	int ret;
41
42	ret = ohci_init(ohci);
43	if (ret < 0)
44		return ret;
45
46	ret = ohci_run(ohci);
47	if (ret < 0) {
48		dev_err(hcd->self.controller, "can't start %s\n",
49			hcd->self.bus_name);
50		ohci_stop(hcd);
51		return ret;
52	}
53
54	return 0;
55}
56
57static const struct hc_driver ohci_tilegx_hc_driver = {
58	.description		= hcd_name,
59	.product_desc		= "Tile-Gx OHCI",
60	.hcd_priv_size		= sizeof(struct ohci_hcd),
61
62	/*
63	 * Generic hardware linkage.
64	 */
65	.irq			= ohci_irq,
66	.flags			= HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
67
68	/*
69	 * Basic lifecycle operations.
70	 */
71	.start			= tilegx_ohci_start,
72	.stop			= ohci_stop,
73	.shutdown		= ohci_shutdown,
74
75	/*
76	 * Managing I/O requests and associated device resources.
77	 */
78	.urb_enqueue		= ohci_urb_enqueue,
79	.urb_dequeue		= ohci_urb_dequeue,
80	.endpoint_disable	= ohci_endpoint_disable,
81
82	/*
83	 * Scheduling support.
84	 */
85	.get_frame_number	= ohci_get_frame,
86
87	/*
88	 * Root hub support.
89	 */
90	.hub_status_data	= ohci_hub_status_data,
91	.hub_control		= ohci_hub_control,
92	.start_port_reset	= ohci_start_port_reset,
93};
94
95static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
96{
97	struct usb_hcd *hcd;
98	struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
99	pte_t pte = { 0 };
100	int my_cpu = smp_processor_id();
101	int ret;
102
103	if (usb_disabled())
104		return -ENODEV;
105
106	/*
107	 * Try to initialize our GXIO context; if we can't, the device
108	 * doesn't exist.
109	 */
110	if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0)
111		return -ENXIO;
112
113	hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
114			     dev_name(&pdev->dev));
115	if (!hcd) {
116		ret = -ENOMEM;
117		goto err_hcd;
118	}
119
120	/*
121	 * We don't use rsrc_start to map in our registers, but seems like
122	 * we ought to set it to something, so we use the register VA.
123	 */
124	hcd->rsrc_start =
125		(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
126	hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
127	hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
128
129	tilegx_start_ohc();
130
131	/* Create our IRQs and register them. */
132	pdata->irq = irq_alloc_hwirq(-1);
133	if (!pdata->irq) {
134		ret = -ENXIO;
135		goto err_no_irq;
136	}
137
138	tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
139
140	/* Configure interrupts. */
141	ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
142					  cpu_x(my_cpu), cpu_y(my_cpu),
143					  KERNEL_PL, pdata->irq);
144	if (ret) {
145		ret = -ENXIO;
146		goto err_have_irq;
147	}
148
149	/* Register all of our memory. */
150	pte = pte_set_home(pte, PAGE_HOME_HASH);
151	ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
152	if (ret) {
153		ret = -ENXIO;
154		goto err_have_irq;
155	}
156
157	ohci_hcd_init(hcd_to_ohci(hcd));
158
159	ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
160	if (ret == 0) {
161		platform_set_drvdata(pdev, hcd);
162		device_wakeup_enable(hcd->self.controller);
163		return ret;
164	}
165
166err_have_irq:
167	irq_free_hwirq(pdata->irq);
168err_no_irq:
169	tilegx_stop_ohc();
170	usb_put_hcd(hcd);
171err_hcd:
172	gxio_usb_host_destroy(&pdata->usb_ctx);
173	return ret;
174}
175
176static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
177{
178	struct usb_hcd *hcd = platform_get_drvdata(pdev);
179	struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
180
181	usb_remove_hcd(hcd);
182	usb_put_hcd(hcd);
183	tilegx_stop_ohc();
184	gxio_usb_host_destroy(&pdata->usb_ctx);
185	irq_free_hwirq(pdata->irq);
186
187	return 0;
188}
189
190static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
191{
192	usb_hcd_platform_shutdown(pdev);
193	ohci_hcd_tilegx_drv_remove(pdev);
194}
195
196static struct platform_driver ohci_hcd_tilegx_driver = {
197	.probe		= ohci_hcd_tilegx_drv_probe,
198	.remove		= ohci_hcd_tilegx_drv_remove,
199	.shutdown	= ohci_hcd_tilegx_drv_shutdown,
200	.driver = {
201		.name	= "tilegx-ohci",
202	}
203};
204
205MODULE_ALIAS("platform:tilegx-ohci");
206