tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 = pdev->dev.platform_data;
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 return -ENOMEM;
117
118 /*
119 * We don't use rsrc_start to map in our registers, but seems like
120 * we ought to set it to something, so we use the register VA.
121 */
122 hcd->rsrc_start =
123 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
124 hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
125 hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
126
127 tilegx_start_ohc();
128
129 /* Create our IRQs and register them. */
130 pdata->irq = create_irq();
131 if (pdata->irq < 0) {
132 ret = -ENXIO;
133 goto err_no_irq;
134 }
135
136 tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
137
138 /* Configure interrupts. */
139 ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
140 cpu_x(my_cpu), cpu_y(my_cpu),
141 KERNEL_PL, pdata->irq);
142 if (ret) {
143 ret = -ENXIO;
144 goto err_have_irq;
145 }
146
147 /* Register all of our memory. */
148 pte = pte_set_home(pte, PAGE_HOME_HASH);
149 ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
150 if (ret) {
151 ret = -ENXIO;
152 goto err_have_irq;
153 }
154
155 ohci_hcd_init(hcd_to_ohci(hcd));
156
157 ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
158 if (ret == 0) {
159 platform_set_drvdata(pdev, hcd);
160 return ret;
161 }
162
163err_have_irq:
164 destroy_irq(pdata->irq);
165err_no_irq:
166 tilegx_stop_ohc();
167 usb_put_hcd(hcd);
168 gxio_usb_host_destroy(&pdata->usb_ctx);
169 return ret;
170}
171
172static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
173{
174 struct usb_hcd *hcd = platform_get_drvdata(pdev);
175 struct tilegx_usb_platform_data* pdata = pdev->dev.platform_data;
176
177 usb_remove_hcd(hcd);
178 usb_put_hcd(hcd);
179 tilegx_stop_ohc();
180 gxio_usb_host_destroy(&pdata->usb_ctx);
181 destroy_irq(pdata->irq);
182 platform_set_drvdata(pdev, NULL);
183
184 return 0;
185}
186
187static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
188{
189 usb_hcd_platform_shutdown(pdev);
190 ohci_hcd_tilegx_drv_remove(pdev);
191}
192
193static struct platform_driver ohci_hcd_tilegx_driver = {
194 .probe = ohci_hcd_tilegx_drv_probe,
195 .remove = ohci_hcd_tilegx_drv_remove,
196 .shutdown = ohci_hcd_tilegx_drv_shutdown,
197 .driver = {
198 .name = "tilegx-ohci",
199 .owner = THIS_MODULE,
200 }
201};
202
203MODULE_ALIAS("platform:tilegx-ohci");