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
tilegx_start_ohc(void)29 static void tilegx_start_ohc(void)
30 {
31 }
32
tilegx_stop_ohc(void)33 static void tilegx_stop_ohc(void)
34 {
35 }
36
tilegx_ohci_start(struct usb_hcd * hcd)37 static 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
57 static 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
ohci_hcd_tilegx_drv_probe(struct platform_device * pdev)95 static 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
166 err_have_irq:
167 irq_free_hwirq(pdata->irq);
168 err_no_irq:
169 tilegx_stop_ohc();
170 usb_put_hcd(hcd);
171 err_hcd:
172 gxio_usb_host_destroy(&pdata->usb_ctx);
173 return ret;
174 }
175
ohci_hcd_tilegx_drv_remove(struct platform_device * pdev)176 static 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
ohci_hcd_tilegx_drv_shutdown(struct platform_device * pdev)190 static 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
196 static 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
205 MODULE_ALIAS("platform:tilegx-ohci");
206