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 | #include <linux/platform_device.h> |
26 | |
27 | static int uhci_grlib_init(struct usb_hcd *hcd) |
28 | { |
29 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
30 | |
31 | /* |
32 | * Probe to determine the endianness of the controller. |
33 | * We know that bit 7 of the PORTSC1 register is always set |
34 | * and bit 15 is always clear. If uhci_readw() yields a value |
35 | * with bit 7 (0x80) turned on then the current little-endian |
36 | * setting is correct. Otherwise we assume the value was |
37 | * byte-swapped; hence the register interface and presumably |
38 | * also the descriptors are big-endian. |
39 | */ |
40 | if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) { |
41 | uhci->big_endian_mmio = 1; |
42 | uhci->big_endian_desc = 1; |
43 | } |
44 | |
45 | uhci->rh_numports = uhci_count_ports(hcd); |
46 | |
47 | /* Set up pointers to generic functions */ |
48 | uhci->reset_hc = uhci_generic_reset_hc; |
49 | uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc; |
50 | /* No special actions need to be taken for the functions below */ |
51 | uhci->configure_hc = NULL; |
52 | uhci->resume_detect_interrupts_are_broken = NULL; |
53 | uhci->global_suspend_mode_is_broken = NULL; |
54 | |
55 | /* Reset if the controller isn't already safely quiescent. */ |
56 | check_and_reset_hc(uhci); |
57 | return 0; |
58 | } |
59 | |
60 | static const struct hc_driver uhci_grlib_hc_driver = { |
61 | .description = hcd_name, |
62 | .product_desc = "GRLIB GRUSBHC UHCI Host Controller" , |
63 | .hcd_priv_size = sizeof(struct uhci_hcd), |
64 | |
65 | /* Generic hardware linkage */ |
66 | .irq = uhci_irq, |
67 | .flags = HCD_MEMORY | HCD_DMA | HCD_USB11, |
68 | |
69 | /* Basic lifecycle operations */ |
70 | .reset = uhci_grlib_init, |
71 | .start = uhci_start, |
72 | #ifdef CONFIG_PM |
73 | .pci_suspend = NULL, |
74 | .pci_resume = NULL, |
75 | .bus_suspend = uhci_rh_suspend, |
76 | .bus_resume = uhci_rh_resume, |
77 | #endif |
78 | .stop = uhci_stop, |
79 | |
80 | .urb_enqueue = uhci_urb_enqueue, |
81 | .urb_dequeue = uhci_urb_dequeue, |
82 | |
83 | .endpoint_disable = uhci_hcd_endpoint_disable, |
84 | .get_frame_number = uhci_hcd_get_frame_number, |
85 | |
86 | .hub_status_data = uhci_hub_status_data, |
87 | .hub_control = uhci_hub_control, |
88 | }; |
89 | |
90 | |
91 | static int uhci_hcd_grlib_probe(struct platform_device *op) |
92 | { |
93 | struct device_node *dn = op->dev.of_node; |
94 | struct usb_hcd *hcd; |
95 | struct uhci_hcd *uhci = NULL; |
96 | struct resource res; |
97 | int irq; |
98 | int rv; |
99 | |
100 | if (usb_disabled()) |
101 | return -ENODEV; |
102 | |
103 | dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n" ); |
104 | |
105 | rv = of_address_to_resource(dev: dn, index: 0, r: &res); |
106 | if (rv) |
107 | return rv; |
108 | |
109 | /* usb_create_hcd requires dma_mask != NULL */ |
110 | op->dev.dma_mask = &op->dev.coherent_dma_mask; |
111 | hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev, |
112 | "GRUSBHC UHCI USB" ); |
113 | if (!hcd) |
114 | return -ENOMEM; |
115 | |
116 | hcd->rsrc_start = res.start; |
117 | hcd->rsrc_len = resource_size(res: &res); |
118 | |
119 | irq = irq_of_parse_and_map(node: dn, index: 0); |
120 | if (!irq) { |
121 | printk(KERN_ERR "%s: irq_of_parse_and_map failed\n" , __FILE__); |
122 | rv = -EBUSY; |
123 | goto err_usb; |
124 | } |
125 | |
126 | hcd->regs = devm_ioremap_resource(dev: &op->dev, res: &res); |
127 | if (IS_ERR(ptr: hcd->regs)) { |
128 | rv = PTR_ERR(ptr: hcd->regs); |
129 | goto err_irq; |
130 | } |
131 | |
132 | uhci = hcd_to_uhci(hcd); |
133 | |
134 | uhci->regs = hcd->regs; |
135 | |
136 | rv = usb_add_hcd(hcd, irq, 0); |
137 | if (rv) |
138 | goto err_irq; |
139 | |
140 | device_wakeup_enable(dev: hcd->self.controller); |
141 | return 0; |
142 | |
143 | err_irq: |
144 | irq_dispose_mapping(virq: irq); |
145 | err_usb: |
146 | usb_put_hcd(hcd); |
147 | |
148 | return rv; |
149 | } |
150 | |
151 | static void uhci_hcd_grlib_remove(struct platform_device *op) |
152 | { |
153 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
154 | |
155 | dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n" ); |
156 | |
157 | usb_remove_hcd(hcd); |
158 | |
159 | irq_dispose_mapping(virq: hcd->irq); |
160 | usb_put_hcd(hcd); |
161 | } |
162 | |
163 | /* Make sure the controller is quiescent and that we're not using it |
164 | * any more. This is mainly for the benefit of programs which, like kexec, |
165 | * expect the hardware to be idle: not doing DMA or generating IRQs. |
166 | * |
167 | * This routine may be called in a damaged or failing kernel. Hence we |
168 | * do not acquire the spinlock before shutting down the controller. |
169 | */ |
170 | static void uhci_hcd_grlib_shutdown(struct platform_device *op) |
171 | { |
172 | struct usb_hcd *hcd = platform_get_drvdata(pdev: op); |
173 | |
174 | uhci_hc_died(hcd_to_uhci(hcd)); |
175 | } |
176 | |
177 | static const struct of_device_id uhci_hcd_grlib_of_match[] = { |
178 | { .name = "GAISLER_UHCI" , }, |
179 | { .name = "01_027" , }, |
180 | {}, |
181 | }; |
182 | MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match); |
183 | |
184 | |
185 | static struct platform_driver uhci_grlib_driver = { |
186 | .probe = uhci_hcd_grlib_probe, |
187 | .remove_new = uhci_hcd_grlib_remove, |
188 | .shutdown = uhci_hcd_grlib_shutdown, |
189 | .driver = { |
190 | .name = "grlib-uhci" , |
191 | .of_match_table = uhci_hcd_grlib_of_match, |
192 | }, |
193 | }; |
194 | |