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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3db7739c JA |
2 | /* |
3 | * UHCI HCD (Host Controller Driver) for GRLIB GRUSBHC | |
4 | * | |
5 | * Copyright (c) 2011 Jan Andersson <jan@gaisler.com> | |
6 | * | |
7 | * This file is based on UHCI PCI HCD: | |
8 | * (C) Copyright 1999 Linus Torvalds | |
9 | * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com | |
10 | * (C) Copyright 1999 Randy Dunlap | |
11 | * (C) Copyright 1999 Georg Acher, acher@in.tum.de | |
12 | * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de | |
13 | * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch | |
14 | * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at | |
15 | * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface | |
16 | * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com). | |
17 | * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) | |
18 | * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu | |
19 | */ | |
20 | ||
ddd94257 | 21 | #include <linux/device.h> |
3db7739c JA |
22 | #include <linux/of_irq.h> |
23 | #include <linux/of_address.h> | |
24 | #include <linux/of_platform.h> | |
25 | ||
26 | static int uhci_grlib_init(struct usb_hcd *hcd) | |
27 | { | |
28 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); | |
29 | ||
fda928ac JA |
30 | /* |
31 | * Probe to determine the endianness of the controller. | |
32 | * We know that bit 7 of the PORTSC1 register is always set | |
33 | * and bit 15 is always clear. If uhci_readw() yields a value | |
34 | * with bit 7 (0x80) turned on then the current little-endian | |
35 | * setting is correct. Otherwise we assume the value was | |
36 | * byte-swapped; hence the register interface and presumably | |
37 | * also the descriptors are big-endian. | |
38 | */ | |
39 | if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) { | |
40 | uhci->big_endian_mmio = 1; | |
41 | uhci->big_endian_desc = 1; | |
42 | } | |
43 | ||
3db7739c JA |
44 | uhci->rh_numports = uhci_count_ports(hcd); |
45 | ||
46 | /* Set up pointers to to generic functions */ | |
47 | uhci->reset_hc = uhci_generic_reset_hc; | |
48 | uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; | |
49 | /* No special actions need to be taken for the functions below */ | |
50 | uhci->configure_hc = NULL; | |
51 | uhci->resume_detect_interrupts_are_broken = NULL; | |
52 | uhci->global_suspend_mode_is_broken = NULL; | |
53 | ||
54 | /* Reset if the controller isn't already safely quiescent. */ | |
55 | check_and_reset_hc(uhci); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static const struct hc_driver uhci_grlib_hc_driver = { | |
60 | .description = hcd_name, | |
61 | .product_desc = "GRLIB GRUSBHC UHCI Host Controller", | |
62 | .hcd_priv_size = sizeof(struct uhci_hcd), | |
63 | ||
64 | /* Generic hardware linkage */ | |
65 | .irq = uhci_irq, | |
66 | .flags = HCD_MEMORY | HCD_USB11, | |
67 | ||
68 | /* Basic lifecycle operations */ | |
69 | .reset = uhci_grlib_init, | |
70 | .start = uhci_start, | |
71 | #ifdef CONFIG_PM | |
72 | .pci_suspend = NULL, | |
73 | .pci_resume = NULL, | |
74 | .bus_suspend = uhci_rh_suspend, | |
75 | .bus_resume = uhci_rh_resume, | |
76 | #endif | |
77 | .stop = uhci_stop, | |
78 | ||
79 | .urb_enqueue = uhci_urb_enqueue, | |
80 | .urb_dequeue = uhci_urb_dequeue, | |
81 | ||
82 | .endpoint_disable = uhci_hcd_endpoint_disable, | |
83 | .get_frame_number = uhci_hcd_get_frame_number, | |
84 | ||
85 | .hub_status_data = uhci_hub_status_data, | |
86 | .hub_control = uhci_hub_control, | |
87 | }; | |
88 | ||
89 | ||
41ac7b3a | 90 | static int uhci_hcd_grlib_probe(struct platform_device *op) |
3db7739c JA |
91 | { |
92 | struct device_node *dn = op->dev.of_node; | |
93 | struct usb_hcd *hcd; | |
94 | struct uhci_hcd *uhci = NULL; | |
95 | struct resource res; | |
96 | int irq; | |
97 | int rv; | |
98 | ||
99 | if (usb_disabled()) | |
100 | return -ENODEV; | |
101 | ||
102 | dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n"); | |
103 | ||
104 | rv = of_address_to_resource(dn, 0, &res); | |
105 | if (rv) | |
106 | return rv; | |
107 | ||
108 | /* usb_create_hcd requires dma_mask != NULL */ | |
109 | op->dev.dma_mask = &op->dev.coherent_dma_mask; | |
110 | hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev, | |
111 | "GRUSBHC UHCI USB"); | |
112 | if (!hcd) | |
113 | return -ENOMEM; | |
114 | ||
115 | hcd->rsrc_start = res.start; | |
28f65c11 | 116 | hcd->rsrc_len = resource_size(&res); |
3db7739c | 117 | |
3db7739c JA |
118 | irq = irq_of_parse_and_map(dn, 0); |
119 | if (irq == NO_IRQ) { | |
120 | printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); | |
121 | rv = -EBUSY; | |
ddd94257 | 122 | goto err_usb; |
3db7739c JA |
123 | } |
124 | ||
ddd94257 HS |
125 | hcd->regs = devm_ioremap_resource(&op->dev, &res); |
126 | if (IS_ERR(hcd->regs)) { | |
127 | rv = PTR_ERR(hcd->regs); | |
128 | goto err_irq; | |
3db7739c JA |
129 | } |
130 | ||
131 | uhci = hcd_to_uhci(hcd); | |
132 | ||
133 | uhci->regs = hcd->regs; | |
134 | ||
135 | rv = usb_add_hcd(hcd, irq, 0); | |
136 | if (rv) | |
ddd94257 | 137 | goto err_irq; |
3db7739c | 138 | |
3c9740a1 | 139 | device_wakeup_enable(hcd->self.controller); |
3db7739c JA |
140 | return 0; |
141 | ||
3db7739c | 142 | err_irq: |
ddd94257 HS |
143 | irq_dispose_mapping(irq); |
144 | err_usb: | |
3db7739c JA |
145 | usb_put_hcd(hcd); |
146 | ||
147 | return rv; | |
148 | } | |
149 | ||
150 | static int uhci_hcd_grlib_remove(struct platform_device *op) | |
151 | { | |
477527ba | 152 | struct usb_hcd *hcd = platform_get_drvdata(op); |
3db7739c JA |
153 | |
154 | dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n"); | |
155 | ||
156 | usb_remove_hcd(hcd); | |
157 | ||
3db7739c | 158 | irq_dispose_mapping(hcd->irq); |
3db7739c JA |
159 | usb_put_hcd(hcd); |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | /* Make sure the controller is quiescent and that we're not using it | |
165 | * any more. This is mainly for the benefit of programs which, like kexec, | |
166 | * expect the hardware to be idle: not doing DMA or generating IRQs. | |
167 | * | |
168 | * This routine may be called in a damaged or failing kernel. Hence we | |
169 | * do not acquire the spinlock before shutting down the controller. | |
170 | */ | |
171 | static void uhci_hcd_grlib_shutdown(struct platform_device *op) | |
172 | { | |
477527ba | 173 | struct usb_hcd *hcd = platform_get_drvdata(op); |
3db7739c JA |
174 | |
175 | uhci_hc_died(hcd_to_uhci(hcd)); | |
176 | } | |
177 | ||
178 | static const struct of_device_id uhci_hcd_grlib_of_match[] = { | |
179 | { .name = "GAISLER_UHCI", }, | |
180 | { .name = "01_027", }, | |
181 | {}, | |
182 | }; | |
183 | MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match); | |
184 | ||
185 | ||
186 | static struct platform_driver uhci_grlib_driver = { | |
187 | .probe = uhci_hcd_grlib_probe, | |
188 | .remove = uhci_hcd_grlib_remove, | |
189 | .shutdown = uhci_hcd_grlib_shutdown, | |
190 | .driver = { | |
191 | .name = "grlib-uhci", | |
3db7739c JA |
192 | .of_match_table = uhci_hcd_grlib_of_match, |
193 | }, | |
194 | }; |