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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Generic UHCI HCD (Host Controller Driver) for Platform Devices
4 *
5 * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
6 *
7 * This file is based on uhci-grlib.c
8 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
9 */
10
11#include <linux/of.h>
12#include <linux/device.h>
13#include <linux/platform_device.h>
14
15static int uhci_platform_init(struct usb_hcd *hcd)
16{
17 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
18
19 /* Probe number of ports if not already provided by DT */
20 if (!uhci->rh_numports)
21 uhci->rh_numports = uhci_count_ports(hcd);
22
23 /* Set up pointers to to generic functions */
24 uhci->reset_hc = uhci_generic_reset_hc;
25 uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
26
27 /* No special actions need to be taken for the functions below */
28 uhci->configure_hc = NULL;
29 uhci->resume_detect_interrupts_are_broken = NULL;
30 uhci->global_suspend_mode_is_broken = NULL;
31
32 /* Reset if the controller isn't already safely quiescent. */
33 check_and_reset_hc(uhci);
34 return 0;
35}
36
37static const struct hc_driver uhci_platform_hc_driver = {
38 .description = hcd_name,
39 .product_desc = "Generic UHCI Host Controller",
40 .hcd_priv_size = sizeof(struct uhci_hcd),
41
42 /* Generic hardware linkage */
43 .irq = uhci_irq,
44 .flags = HCD_MEMORY | HCD_DMA | HCD_USB11,
45
46 /* Basic lifecycle operations */
47 .reset = uhci_platform_init,
48 .start = uhci_start,
49#ifdef CONFIG_PM
50 .pci_suspend = NULL,
51 .pci_resume = NULL,
52 .bus_suspend = uhci_rh_suspend,
53 .bus_resume = uhci_rh_resume,
54#endif
55 .stop = uhci_stop,
56
57 .urb_enqueue = uhci_urb_enqueue,
58 .urb_dequeue = uhci_urb_dequeue,
59
60 .endpoint_disable = uhci_hcd_endpoint_disable,
61 .get_frame_number = uhci_hcd_get_frame_number,
62
63 .hub_status_data = uhci_hub_status_data,
64 .hub_control = uhci_hub_control,
65};
66
67static int uhci_hcd_platform_probe(struct platform_device *pdev)
68{
69 struct device_node *np = pdev->dev.of_node;
70 struct usb_hcd *hcd;
71 struct uhci_hcd *uhci;
72 struct resource *res;
73 int ret;
74
75 if (usb_disabled())
76 return -ENODEV;
77
78 /*
79 * Right now device-tree probed devices don't get dma_mask set.
80 * Since shared usb code relies on it, set it here for now.
81 * Once we have dma capability bindings this can go away.
82 */
83 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
84 if (ret)
85 return ret;
86
87 hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
88 pdev->name);
89 if (!hcd)
90 return -ENOMEM;
91
92 uhci = hcd_to_uhci(hcd);
93
94 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
95 if (IS_ERR(hcd->regs)) {
96 ret = PTR_ERR(hcd->regs);
97 goto err_rmr;
98 }
99 hcd->rsrc_start = res->start;
100 hcd->rsrc_len = resource_size(res);
101
102 uhci->regs = hcd->regs;
103
104 /* Grab some things from the device-tree */
105 if (np) {
106 u32 num_ports;
107
108 if (of_property_read_u32(np, "#ports", &num_ports) == 0) {
109 uhci->rh_numports = num_ports;
110 dev_info(&pdev->dev,
111 "Detected %d ports from device-tree\n",
112 num_ports);
113 }
114 if (of_device_is_compatible(np, "aspeed,ast2400-uhci") ||
115 of_device_is_compatible(np, "aspeed,ast2500-uhci") ||
116 of_device_is_compatible(np, "aspeed,ast2600-uhci")) {
117 uhci->is_aspeed = 1;
118 dev_info(&pdev->dev,
119 "Enabled Aspeed implementation workarounds\n");
120 }
121 }
122
123 /* Get and enable clock if any specified */
124 uhci->clk = devm_clk_get(&pdev->dev, NULL);
125 if (IS_ERR(uhci->clk)) {
126 ret = PTR_ERR(uhci->clk);
127 goto err_rmr;
128 }
129 ret = clk_prepare_enable(uhci->clk);
130 if (ret) {
131 dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
132 goto err_rmr;
133 }
134
135 ret = platform_get_irq(pdev, 0);
136 if (ret < 0)
137 goto err_clk;
138
139 ret = usb_add_hcd(hcd, ret, IRQF_SHARED);
140 if (ret)
141 goto err_clk;
142
143 device_wakeup_enable(hcd->self.controller);
144 return 0;
145
146err_clk:
147 clk_disable_unprepare(uhci->clk);
148err_rmr:
149 usb_put_hcd(hcd);
150
151 return ret;
152}
153
154static void uhci_hcd_platform_remove(struct platform_device *pdev)
155{
156 struct usb_hcd *hcd = platform_get_drvdata(pdev);
157 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
158
159 clk_disable_unprepare(uhci->clk);
160 usb_remove_hcd(hcd);
161 usb_put_hcd(hcd);
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 */
171static void uhci_hcd_platform_shutdown(struct platform_device *op)
172{
173 struct usb_hcd *hcd = platform_get_drvdata(op);
174
175 uhci_hc_died(hcd_to_uhci(hcd));
176}
177
178static const struct of_device_id platform_uhci_ids[] = {
179 { .compatible = "generic-uhci", },
180 { .compatible = "platform-uhci", },
181 {}
182};
183MODULE_DEVICE_TABLE(of, platform_uhci_ids);
184
185static struct platform_driver uhci_platform_driver = {
186 .probe = uhci_hcd_platform_probe,
187 .remove_new = uhci_hcd_platform_remove,
188 .shutdown = uhci_hcd_platform_shutdown,
189 .driver = {
190 .name = "platform-uhci",
191 .of_match_table = platform_uhci_ids,
192 },
193};
1/*
2 * Generic UHCI HCD (Host Controller Driver) for Platform Devices
3 *
4 * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
5 *
6 * This file is based on uhci-grlib.c
7 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
8 */
9
10#include <linux/of.h>
11#include <linux/platform_device.h>
12
13static int uhci_platform_init(struct usb_hcd *hcd)
14{
15 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
16
17 uhci->rh_numports = uhci_count_ports(hcd);
18
19 /* Set up pointers to to generic functions */
20 uhci->reset_hc = uhci_generic_reset_hc;
21 uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
22
23 /* No special actions need to be taken for the functions below */
24 uhci->configure_hc = NULL;
25 uhci->resume_detect_interrupts_are_broken = NULL;
26 uhci->global_suspend_mode_is_broken = NULL;
27
28 /* Reset if the controller isn't already safely quiescent. */
29 check_and_reset_hc(uhci);
30 return 0;
31}
32
33static const struct hc_driver uhci_platform_hc_driver = {
34 .description = hcd_name,
35 .product_desc = "Generic UHCI Host Controller",
36 .hcd_priv_size = sizeof(struct uhci_hcd),
37
38 /* Generic hardware linkage */
39 .irq = uhci_irq,
40 .flags = HCD_MEMORY | HCD_USB11,
41
42 /* Basic lifecycle operations */
43 .reset = uhci_platform_init,
44 .start = uhci_start,
45#ifdef CONFIG_PM
46 .pci_suspend = NULL,
47 .pci_resume = NULL,
48 .bus_suspend = uhci_rh_suspend,
49 .bus_resume = uhci_rh_resume,
50#endif
51 .stop = uhci_stop,
52
53 .urb_enqueue = uhci_urb_enqueue,
54 .urb_dequeue = uhci_urb_dequeue,
55
56 .endpoint_disable = uhci_hcd_endpoint_disable,
57 .get_frame_number = uhci_hcd_get_frame_number,
58
59 .hub_status_data = uhci_hub_status_data,
60 .hub_control = uhci_hub_control,
61};
62
63static int uhci_hcd_platform_probe(struct platform_device *pdev)
64{
65 struct usb_hcd *hcd;
66 struct uhci_hcd *uhci;
67 struct resource *res;
68 int ret;
69
70 if (usb_disabled())
71 return -ENODEV;
72
73 /*
74 * Right now device-tree probed devices don't get dma_mask set.
75 * Since shared usb code relies on it, set it here for now.
76 * Once we have dma capability bindings this can go away.
77 */
78 ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
79 if (ret)
80 return ret;
81
82 hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
83 pdev->name);
84 if (!hcd)
85 return -ENOMEM;
86
87 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
88 hcd->rsrc_start = res->start;
89 hcd->rsrc_len = resource_size(res);
90
91 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
92 pr_err("%s: request_mem_region failed\n", __func__);
93 ret = -EBUSY;
94 goto err_rmr;
95 }
96
97 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
98 if (!hcd->regs) {
99 pr_err("%s: ioremap failed\n", __func__);
100 ret = -ENOMEM;
101 goto err_irq;
102 }
103 uhci = hcd_to_uhci(hcd);
104
105 uhci->regs = hcd->regs;
106
107 ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
108 if (ret)
109 goto err_uhci;
110
111 device_wakeup_enable(hcd->self.controller);
112 return 0;
113
114err_uhci:
115 iounmap(hcd->regs);
116err_irq:
117 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
118err_rmr:
119 usb_put_hcd(hcd);
120
121 return ret;
122}
123
124static int uhci_hcd_platform_remove(struct platform_device *pdev)
125{
126 struct usb_hcd *hcd = platform_get_drvdata(pdev);
127
128 usb_remove_hcd(hcd);
129 iounmap(hcd->regs);
130 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
131 usb_put_hcd(hcd);
132
133 return 0;
134}
135
136/* Make sure the controller is quiescent and that we're not using it
137 * any more. This is mainly for the benefit of programs which, like kexec,
138 * expect the hardware to be idle: not doing DMA or generating IRQs.
139 *
140 * This routine may be called in a damaged or failing kernel. Hence we
141 * do not acquire the spinlock before shutting down the controller.
142 */
143static void uhci_hcd_platform_shutdown(struct platform_device *op)
144{
145 struct usb_hcd *hcd = platform_get_drvdata(op);
146
147 uhci_hc_died(hcd_to_uhci(hcd));
148}
149
150static const struct of_device_id platform_uhci_ids[] = {
151 { .compatible = "generic-uhci", },
152 { .compatible = "platform-uhci", },
153 {}
154};
155
156static struct platform_driver uhci_platform_driver = {
157 .probe = uhci_hcd_platform_probe,
158 .remove = uhci_hcd_platform_remove,
159 .shutdown = uhci_hcd_platform_shutdown,
160 .driver = {
161 .name = "platform-uhci",
162 .owner = THIS_MODULE,
163 .of_match_table = platform_uhci_ids,
164 },
165};