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47fc28bf CM |
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 | ||
29 | static void tilegx_start_ohc(void) | |
30 | { | |
31 | } | |
32 | ||
33 | static void tilegx_stop_ohc(void) | |
34 | { | |
35 | } | |
36 | ||
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 | ||
95 | static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev) | |
96 | { | |
97 | struct usb_hcd *hcd; | |
d4f09e28 | 98 | struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); |
47fc28bf CM |
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)); | |
abab8761 LC |
115 | if (!hcd) { |
116 | ret = -ENOMEM; | |
117 | goto err_hcd; | |
118 | } | |
47fc28bf CM |
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. */ | |
7e5f01b1 TG |
132 | pdata->irq = irq_alloc_hwirq(-1); |
133 | if (!pdata->irq) { | |
47fc28bf CM |
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); | |
3c9740a1 | 162 | device_wakeup_enable(hcd->self.controller); |
47fc28bf CM |
163 | return ret; |
164 | } | |
165 | ||
166 | err_have_irq: | |
7e5f01b1 | 167 | irq_free_hwirq(pdata->irq); |
47fc28bf CM |
168 | err_no_irq: |
169 | tilegx_stop_ohc(); | |
170 | usb_put_hcd(hcd); | |
abab8761 | 171 | err_hcd: |
47fc28bf CM |
172 | gxio_usb_host_destroy(&pdata->usb_ctx); |
173 | return ret; | |
174 | } | |
175 | ||
176 | static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev) | |
177 | { | |
178 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
d4f09e28 | 179 | struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); |
47fc28bf CM |
180 | |
181 | usb_remove_hcd(hcd); | |
182 | usb_put_hcd(hcd); | |
183 | tilegx_stop_ohc(); | |
184 | gxio_usb_host_destroy(&pdata->usb_ctx); | |
7e5f01b1 | 185 | irq_free_hwirq(pdata->irq); |
47fc28bf CM |
186 | |
187 | return 0; | |
188 | } | |
189 | ||
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", | |
47fc28bf CM |
202 | } |
203 | }; | |
204 | ||
205 | MODULE_ALIAS("platform:tilegx-ohci"); |