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 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,
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 = pdev->dev.platform_data;
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 return -ENOMEM;
123
124 /*
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.
127 */
128 hcd->rsrc_start =
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);
132
133 tilegx_start_ehc();
134
135 ehci = hcd_to_ehci(hcd);
136 ehci->caps = hcd->regs;
137 ehci->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);
141
142 /* Create our IRQs and register them. */
143 pdata->irq = create_irq();
144 if (pdata->irq < 0) {
145 ret = -ENXIO;
146 goto err_no_irq;
147 }
148
149 tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
150
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);
155 if (ret) {
156 ret = -ENXIO;
157 goto err_have_irq;
158 }
159
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);
163 if (ret) {
164 ret = -ENXIO;
165 goto err_have_irq;
166 }
167
168 ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
169 if (ret == 0) {
170 platform_set_drvdata(pdev, hcd);
171 return ret;
172 }
173
174err_have_irq:
175 destroy_irq(pdata->irq);
176err_no_irq:
177 tilegx_stop_ehc();
178 usb_put_hcd(hcd);
179 gxio_usb_host_destroy(&pdata->usb_ctx);
180 return ret;
181}
182
183static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
184{
185 struct usb_hcd *hcd = platform_get_drvdata(pdev);
186 struct tilegx_usb_platform_data *pdata = pdev->dev.platform_data;
187
188 usb_remove_hcd(hcd);
189 usb_put_hcd(hcd);
190 tilegx_stop_ehc();
191 gxio_usb_host_destroy(&pdata->usb_ctx);
192 destroy_irq(pdata->irq);
193 platform_set_drvdata(pdev, NULL);
194
195 return 0;
196}
197
198static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
199{
200 usb_hcd_platform_shutdown(pdev);
201 ehci_hcd_tilegx_drv_remove(pdev);
202}
203
204static 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,
208 .driver = {
209 .name = "tilegx-ehci",
210 .owner = THIS_MODULE,
211 }
212};
213
214MODULE_ALIAS("platform:tilegx-ehci");