1 | // SPDX-License-Identifier: GPL-2.0 |
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 | |
21 | #include <linux/device.h> |
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 | |
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 | |
44 | uhci->rh_numports = uhci_count_ports(hcd); |
45 | |
46 | /* Set up pointers 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_DMA | 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 | |
90 | static int uhci_hcd_grlib_probe(struct platform_device *op) |
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(dev: dn, index: 0, r: &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; |
116 | hcd->rsrc_len = resource_size(res: &res); |
117 | |
118 | irq = irq_of_parse_and_map(node: dn, index: 0); |
119 | if (!irq) { |
120 | printk(KERN_ERR "%s: irq_of_parse_and_map failed\n" , __FILE__); |
121 | rv = -EBUSY; |
122 | goto err_usb; |
123 | } |
124 | |
125 | hcd->regs = devm_ioremap_resource(dev: &op->dev, res: &res); |
126 | if (IS_ERR(ptr: hcd->regs)) { |
127 | rv = PTR_ERR(ptr: hcd->regs); |
128 | goto err_irq; |
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) |
137 | goto err_irq; |
138 | |
139 | device_wakeup_enable(dev: hcd->self.controller); |
140 | return 0; |
141 | |
142 | err_irq: |
143 | irq_dispose_mapping(virq: irq); |
144 | err_usb: |
145 | usb_put_hcd(hcd); |
146 | |
147 | return rv; |
148 | } |
149 | |
150 | static void uhci_hcd_grlib_remove(struct platform_device *op) |
151 | { |
152 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
153 | |
154 | dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n" ); |
155 | |
156 | usb_remove_hcd(hcd); |
157 | |
158 | irq_dispose_mapping(virq: hcd->irq); |
159 | usb_put_hcd(hcd); |
160 | } |
161 | |
162 | /* Make sure the controller is quiescent and that we're not using it |
163 | * any more. This is mainly for the benefit of programs which, like kexec, |
164 | * expect the hardware to be idle: not doing DMA or generating IRQs. |
165 | * |
166 | * This routine may be called in a damaged or failing kernel. Hence we |
167 | * do not acquire the spinlock before shutting down the controller. |
168 | */ |
169 | static void uhci_hcd_grlib_shutdown(struct platform_device *op) |
170 | { |
171 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
172 | |
173 | uhci_hc_died(hcd_to_uhci(hcd)); |
174 | } |
175 | |
176 | static const struct of_device_id uhci_hcd_grlib_of_match[] = { |
177 | { .name = "GAISLER_UHCI" , }, |
178 | { .name = "01_027" , }, |
179 | {}, |
180 | }; |
181 | MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match); |
182 | |
183 | |
184 | static struct platform_driver uhci_grlib_driver = { |
185 | .probe = uhci_hcd_grlib_probe, |
186 | .remove_new = uhci_hcd_grlib_remove, |
187 | .shutdown = uhci_hcd_grlib_shutdown, |
188 | .driver = { |
189 | .name = "grlib-uhci" , |
190 | .of_match_table = uhci_hcd_grlib_of_match, |
191 | }, |
192 | }; |
193 | |