blob: 67026ffbf9a871c9780a4b0b7f0d6c739c904e73 [file] [log] [blame]
Chris Metcalf47fc28b2012-05-09 13:58:14 -04001/*
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,
Greg Kroah-Hartmanc04ee4b2013-09-23 13:32:51 -070064 .flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
Chris Metcalf47fc28b2012-05-09 13:58:14 -040065
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;
Jingoo Hand4f09e22013-07-30 19:59:40 +0900104 struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
Chris Metcalf47fc28b2012-05-09 13:58:14 -0400105 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));
Libo Chenabab8762013-05-09 02:08:33 -0400121 if (!hcd) {
122 ret = -ENOMEM;
123 goto err_hcd;
124 }
Chris Metcalf47fc28b2012-05-09 13:58:14 -0400125
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 = create_irq();
146 if (pdata->irq < 0) {
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 return ret;
174 }
175
176err_have_irq:
177 destroy_irq(pdata->irq);
178err_no_irq:
179 tilegx_stop_ehc();
180 usb_put_hcd(hcd);
Libo Chenabab8762013-05-09 02:08:33 -0400181err_hcd:
Chris Metcalf47fc28b2012-05-09 13:58:14 -0400182 gxio_usb_host_destroy(&pdata->usb_ctx);
183 return ret;
184}
185
186static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
187{
188 struct usb_hcd *hcd = platform_get_drvdata(pdev);
Jingoo Hand4f09e22013-07-30 19:59:40 +0900189 struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
Chris Metcalf47fc28b2012-05-09 13:58:14 -0400190
191 usb_remove_hcd(hcd);
192 usb_put_hcd(hcd);
193 tilegx_stop_ehc();
194 gxio_usb_host_destroy(&pdata->usb_ctx);
195 destroy_irq(pdata->irq);
Chris Metcalf47fc28b2012-05-09 13:58:14 -0400196
197 return 0;
198}
199
200static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
201{
202 usb_hcd_platform_shutdown(pdev);
203 ehci_hcd_tilegx_drv_remove(pdev);
204}
205
206static struct platform_driver ehci_hcd_tilegx_driver = {
207 .probe = ehci_hcd_tilegx_drv_probe,
208 .remove = ehci_hcd_tilegx_drv_remove,
209 .shutdown = ehci_hcd_tilegx_drv_shutdown,
210 .driver = {
211 .name = "tilegx-ehci",
212 .owner = THIS_MODULE,
213 }
214};
215
216MODULE_ALIAS("platform:tilegx-ehci");