tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2012 Tilera Corporation. All Rights Reserved.
4 */
5
6/*
7 * Tilera TILE-Gx USB OHCI host controller driver.
8 */
9
10#include <linux/irq.h>
11#include <linux/platform_device.h>
12#include <linux/usb/tilegx.h>
13#include <linux/usb.h>
14
15#include <asm/homecache.h>
16
17#include <gxio/iorpc_usb_host.h>
18#include <gxio/usb_host.h>
19
20static void tilegx_start_ohc(void)
21{
22}
23
24static void tilegx_stop_ohc(void)
25{
26}
27
28static int tilegx_ohci_start(struct usb_hcd *hcd)
29{
30 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
31 int ret;
32
33 ret = ohci_init(ohci);
34 if (ret < 0)
35 return ret;
36
37 ret = ohci_run(ohci);
38 if (ret < 0) {
39 dev_err(hcd->self.controller, "can't start %s\n",
40 hcd->self.bus_name);
41 ohci_stop(hcd);
42 return ret;
43 }
44
45 return 0;
46}
47
48static const struct hc_driver ohci_tilegx_hc_driver = {
49 .description = hcd_name,
50 .product_desc = "Tile-Gx OHCI",
51 .hcd_priv_size = sizeof(struct ohci_hcd),
52
53 /*
54 * Generic hardware linkage.
55 */
56 .irq = ohci_irq,
57 .flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
58
59 /*
60 * Basic lifecycle operations.
61 */
62 .start = tilegx_ohci_start,
63 .stop = ohci_stop,
64 .shutdown = ohci_shutdown,
65
66 /*
67 * Managing I/O requests and associated device resources.
68 */
69 .urb_enqueue = ohci_urb_enqueue,
70 .urb_dequeue = ohci_urb_dequeue,
71 .endpoint_disable = ohci_endpoint_disable,
72
73 /*
74 * Scheduling support.
75 */
76 .get_frame_number = ohci_get_frame,
77
78 /*
79 * Root hub support.
80 */
81 .hub_status_data = ohci_hub_status_data,
82 .hub_control = ohci_hub_control,
83 .start_port_reset = ohci_start_port_reset,
84};
85
86static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
87{
88 struct usb_hcd *hcd;
89 struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
90 pte_t pte = { 0 };
91 int my_cpu = smp_processor_id();
92 int ret;
93
94 if (usb_disabled())
95 return -ENODEV;
96
97 /*
98 * Try to initialize our GXIO context; if we can't, the device
99 * doesn't exist.
100 */
101 if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0)
102 return -ENXIO;
103
104 hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
105 dev_name(&pdev->dev));
106 if (!hcd) {
107 ret = -ENOMEM;
108 goto err_hcd;
109 }
110
111 /*
112 * We don't use rsrc_start to map in our registers, but seems like
113 * we ought to set it to something, so we use the register VA.
114 */
115 hcd->rsrc_start =
116 (ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
117 hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
118 hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
119
120 tilegx_start_ohc();
121
122 /* Create our IRQs and register them. */
123 pdata->irq = irq_alloc_hwirq(-1);
124 if (!pdata->irq) {
125 ret = -ENXIO;
126 goto err_no_irq;
127 }
128
129 tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
130
131 /* Configure interrupts. */
132 ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
133 cpu_x(my_cpu), cpu_y(my_cpu),
134 KERNEL_PL, pdata->irq);
135 if (ret) {
136 ret = -ENXIO;
137 goto err_have_irq;
138 }
139
140 /* Register all of our memory. */
141 pte = pte_set_home(pte, PAGE_HOME_HASH);
142 ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
143 if (ret) {
144 ret = -ENXIO;
145 goto err_have_irq;
146 }
147
148 ohci_hcd_init(hcd_to_ohci(hcd));
149
150 ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
151 if (ret == 0) {
152 platform_set_drvdata(pdev, hcd);
153 device_wakeup_enable(hcd->self.controller);
154 return ret;
155 }
156
157err_have_irq:
158 irq_free_hwirq(pdata->irq);
159err_no_irq:
160 tilegx_stop_ohc();
161 usb_put_hcd(hcd);
162err_hcd:
163 gxio_usb_host_destroy(&pdata->usb_ctx);
164 return ret;
165}
166
167static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
168{
169 struct usb_hcd *hcd = platform_get_drvdata(pdev);
170 struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
171
172 usb_remove_hcd(hcd);
173 usb_put_hcd(hcd);
174 tilegx_stop_ohc();
175 gxio_usb_host_destroy(&pdata->usb_ctx);
176 irq_free_hwirq(pdata->irq);
177
178 return 0;
179}
180
181static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
182{
183 usb_hcd_platform_shutdown(pdev);
184 ohci_hcd_tilegx_drv_remove(pdev);
185}
186
187static struct platform_driver ohci_hcd_tilegx_driver = {
188 .probe = ohci_hcd_tilegx_drv_probe,
189 .remove = ohci_hcd_tilegx_drv_remove,
190 .shutdown = ohci_hcd_tilegx_drv_shutdown,
191 .driver = {
192 .name = "tilegx-ohci",
193 }
194};
195
196MODULE_ALIAS("platform:tilegx-ohci");