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
tilegx_start_ehc(void)29 static void tilegx_start_ehc(void)
30 {
31 }
32
tilegx_stop_ehc(void)33 static void tilegx_stop_ehc(void)
34 {
35 }
36
tilegx_ehci_setup(struct usb_hcd * hcd)37 static 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
55 static 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 | HCD_BH,
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
ehci_hcd_tilegx_drv_probe(struct platform_device * pdev)100 static 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 = dev_get_platdata(&pdev->dev);
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 ret = -ENOMEM;
123 goto err_hcd;
124 }
125
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 = irq_alloc_hwirq(-1);
146 if (!pdata->irq) {
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 device_wakeup_enable(hcd->self.controller);
174 return ret;
175 }
176
177 err_have_irq:
178 irq_free_hwirq(pdata->irq);
179 err_no_irq:
180 tilegx_stop_ehc();
181 usb_put_hcd(hcd);
182 err_hcd:
183 gxio_usb_host_destroy(&pdata->usb_ctx);
184 return ret;
185 }
186
ehci_hcd_tilegx_drv_remove(struct platform_device * pdev)187 static int ehci_hcd_tilegx_drv_remove(struct platform_device *pdev)
188 {
189 struct usb_hcd *hcd = platform_get_drvdata(pdev);
190 struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
191
192 usb_remove_hcd(hcd);
193 usb_put_hcd(hcd);
194 tilegx_stop_ehc();
195 gxio_usb_host_destroy(&pdata->usb_ctx);
196 irq_free_hwirq(pdata->irq);
197
198 return 0;
199 }
200
ehci_hcd_tilegx_drv_shutdown(struct platform_device * pdev)201 static void ehci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
202 {
203 usb_hcd_platform_shutdown(pdev);
204 ehci_hcd_tilegx_drv_remove(pdev);
205 }
206
207 static struct platform_driver ehci_hcd_tilegx_driver = {
208 .probe = ehci_hcd_tilegx_drv_probe,
209 .remove = ehci_hcd_tilegx_drv_remove,
210 .shutdown = ehci_hcd_tilegx_drv_shutdown,
211 .driver = {
212 .name = "tilegx-ehci",
213 }
214 };
215
216 MODULE_ALIAS("platform:tilegx-ehci");
217