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3db7739c JA |
1 | /* |
2 | * UHCI HCD (Host Controller Driver) for GRLIB GRUSBHC | |
3 | * | |
4 | * Copyright (c) 2011 Jan Andersson <jan@gaisler.com> | |
5 | * | |
6 | * This file is based on UHCI PCI HCD: | |
7 | * (C) Copyright 1999 Linus Torvalds | |
8 | * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com | |
9 | * (C) Copyright 1999 Randy Dunlap | |
10 | * (C) Copyright 1999 Georg Acher, acher@in.tum.de | |
11 | * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de | |
12 | * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch | |
13 | * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at | |
14 | * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface | |
15 | * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com). | |
16 | * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) | |
17 | * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu | |
18 | */ | |
19 | ||
20 | #include <linux/of_irq.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/of_platform.h> | |
23 | ||
24 | static int uhci_grlib_init(struct usb_hcd *hcd) | |
25 | { | |
26 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); | |
27 | ||
fda928ac JA |
28 | /* |
29 | * Probe to determine the endianness of the controller. | |
30 | * We know that bit 7 of the PORTSC1 register is always set | |
31 | * and bit 15 is always clear. If uhci_readw() yields a value | |
32 | * with bit 7 (0x80) turned on then the current little-endian | |
33 | * setting is correct. Otherwise we assume the value was | |
34 | * byte-swapped; hence the register interface and presumably | |
35 | * also the descriptors are big-endian. | |
36 | */ | |
37 | if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) { | |
38 | uhci->big_endian_mmio = 1; | |
39 | uhci->big_endian_desc = 1; | |
40 | } | |
41 | ||
3db7739c JA |
42 | uhci->rh_numports = uhci_count_ports(hcd); |
43 | ||
44 | /* Set up pointers to to generic functions */ | |
45 | uhci->reset_hc = uhci_generic_reset_hc; | |
46 | uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; | |
47 | /* No special actions need to be taken for the functions below */ | |
48 | uhci->configure_hc = NULL; | |
49 | uhci->resume_detect_interrupts_are_broken = NULL; | |
50 | uhci->global_suspend_mode_is_broken = NULL; | |
51 | ||
52 | /* Reset if the controller isn't already safely quiescent. */ | |
53 | check_and_reset_hc(uhci); | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static const struct hc_driver uhci_grlib_hc_driver = { | |
58 | .description = hcd_name, | |
59 | .product_desc = "GRLIB GRUSBHC UHCI Host Controller", | |
60 | .hcd_priv_size = sizeof(struct uhci_hcd), | |
61 | ||
62 | /* Generic hardware linkage */ | |
63 | .irq = uhci_irq, | |
64 | .flags = HCD_MEMORY | HCD_USB11, | |
65 | ||
66 | /* Basic lifecycle operations */ | |
67 | .reset = uhci_grlib_init, | |
68 | .start = uhci_start, | |
69 | #ifdef CONFIG_PM | |
70 | .pci_suspend = NULL, | |
71 | .pci_resume = NULL, | |
72 | .bus_suspend = uhci_rh_suspend, | |
73 | .bus_resume = uhci_rh_resume, | |
74 | #endif | |
75 | .stop = uhci_stop, | |
76 | ||
77 | .urb_enqueue = uhci_urb_enqueue, | |
78 | .urb_dequeue = uhci_urb_dequeue, | |
79 | ||
80 | .endpoint_disable = uhci_hcd_endpoint_disable, | |
81 | .get_frame_number = uhci_hcd_get_frame_number, | |
82 | ||
83 | .hub_status_data = uhci_hub_status_data, | |
84 | .hub_control = uhci_hub_control, | |
85 | }; | |
86 | ||
87 | ||
41ac7b3a | 88 | static int uhci_hcd_grlib_probe(struct platform_device *op) |
3db7739c JA |
89 | { |
90 | struct device_node *dn = op->dev.of_node; | |
91 | struct usb_hcd *hcd; | |
92 | struct uhci_hcd *uhci = NULL; | |
93 | struct resource res; | |
94 | int irq; | |
95 | int rv; | |
96 | ||
97 | if (usb_disabled()) | |
98 | return -ENODEV; | |
99 | ||
100 | dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n"); | |
101 | ||
102 | rv = of_address_to_resource(dn, 0, &res); | |
103 | if (rv) | |
104 | return rv; | |
105 | ||
106 | /* usb_create_hcd requires dma_mask != NULL */ | |
107 | op->dev.dma_mask = &op->dev.coherent_dma_mask; | |
108 | hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev, | |
109 | "GRUSBHC UHCI USB"); | |
110 | if (!hcd) | |
111 | return -ENOMEM; | |
112 | ||
113 | hcd->rsrc_start = res.start; | |
28f65c11 | 114 | hcd->rsrc_len = resource_size(&res); |
3db7739c JA |
115 | |
116 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | |
117 | printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__); | |
118 | rv = -EBUSY; | |
119 | goto err_rmr; | |
120 | } | |
121 | ||
122 | irq = irq_of_parse_and_map(dn, 0); | |
123 | if (irq == NO_IRQ) { | |
124 | printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); | |
125 | rv = -EBUSY; | |
126 | goto err_irq; | |
127 | } | |
128 | ||
129 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
130 | if (!hcd->regs) { | |
131 | printk(KERN_ERR "%s: ioremap failed\n", __FILE__); | |
132 | rv = -ENOMEM; | |
133 | goto err_ioremap; | |
134 | } | |
135 | ||
136 | uhci = hcd_to_uhci(hcd); | |
137 | ||
138 | uhci->regs = hcd->regs; | |
139 | ||
140 | rv = usb_add_hcd(hcd, irq, 0); | |
141 | if (rv) | |
142 | goto err_uhci; | |
143 | ||
144 | return 0; | |
145 | ||
146 | err_uhci: | |
147 | iounmap(hcd->regs); | |
148 | err_ioremap: | |
149 | irq_dispose_mapping(irq); | |
150 | err_irq: | |
151 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
152 | err_rmr: | |
153 | usb_put_hcd(hcd); | |
154 | ||
155 | return rv; | |
156 | } | |
157 | ||
158 | static int uhci_hcd_grlib_remove(struct platform_device *op) | |
159 | { | |
160 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
161 | ||
162 | dev_set_drvdata(&op->dev, NULL); | |
163 | ||
164 | dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n"); | |
165 | ||
166 | usb_remove_hcd(hcd); | |
167 | ||
168 | iounmap(hcd->regs); | |
169 | irq_dispose_mapping(hcd->irq); | |
170 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
171 | ||
172 | usb_put_hcd(hcd); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | /* Make sure the controller is quiescent and that we're not using it | |
178 | * any more. This is mainly for the benefit of programs which, like kexec, | |
179 | * expect the hardware to be idle: not doing DMA or generating IRQs. | |
180 | * | |
181 | * This routine may be called in a damaged or failing kernel. Hence we | |
182 | * do not acquire the spinlock before shutting down the controller. | |
183 | */ | |
184 | static void uhci_hcd_grlib_shutdown(struct platform_device *op) | |
185 | { | |
186 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
187 | ||
188 | uhci_hc_died(hcd_to_uhci(hcd)); | |
189 | } | |
190 | ||
191 | static const struct of_device_id uhci_hcd_grlib_of_match[] = { | |
192 | { .name = "GAISLER_UHCI", }, | |
193 | { .name = "01_027", }, | |
194 | {}, | |
195 | }; | |
196 | MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match); | |
197 | ||
198 | ||
199 | static struct platform_driver uhci_grlib_driver = { | |
200 | .probe = uhci_hcd_grlib_probe, | |
201 | .remove = uhci_hcd_grlib_remove, | |
202 | .shutdown = uhci_hcd_grlib_shutdown, | |
203 | .driver = { | |
204 | .name = "grlib-uhci", | |
205 | .owner = THIS_MODULE, | |
206 | .of_match_table = uhci_hcd_grlib_of_match, | |
207 | }, | |
208 | }; |