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1/*
2* Driver for EHCI HCD on SPEAR SOC
3*
4* Copyright (C) 2010 ST Micro Electronics,
5* Deepak Sikri <deepak.sikri@st.com>
6*
7* Based on various ehci-*.c drivers
8*
9* This file is subject to the terms and conditions of the GNU General Public
10* License. See the file COPYING in the main directory of this archive for
11* more details.
12*/
13
14#include <linux/platform_device.h>
15#include <linux/clk.h>
16
17struct spear_ehci {
18 struct ehci_hcd ehci;
19 struct clk *clk;
20};
21
22#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
23
24static void spear_start_ehci(struct spear_ehci *ehci)
25{
26 clk_enable(ehci->clk);
27}
28
29static void spear_stop_ehci(struct spear_ehci *ehci)
30{
31 clk_disable(ehci->clk);
32}
33
34static int ehci_spear_setup(struct usb_hcd *hcd)
35{
36 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
37 int retval = 0;
38
39 /* registers start at offset 0x0 */
40 ehci->caps = hcd->regs;
41 ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci,
42 &ehci->caps->hc_capbase));
43 /* cache this readonly data; minimize chip reads */
44 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
45 retval = ehci_halt(ehci);
46 if (retval)
47 return retval;
48
49 retval = ehci_init(hcd);
50 if (retval)
51 return retval;
52
53 ehci_reset(ehci);
54 ehci_port_power(ehci, 0);
55
56 return retval;
57}
58
59static const struct hc_driver ehci_spear_hc_driver = {
60 .description = hcd_name,
61 .product_desc = "SPEAr EHCI",
62 .hcd_priv_size = sizeof(struct spear_ehci),
63
64 /* generic hardware linkage */
65 .irq = ehci_irq,
66 .flags = HCD_MEMORY | HCD_USB2,
67
68 /* basic lifecycle operations */
69 .reset = ehci_spear_setup,
70 .start = ehci_run,
71 .stop = ehci_stop,
72 .shutdown = ehci_shutdown,
73
74 /* managing i/o requests and associated device resources */
75 .urb_enqueue = ehci_urb_enqueue,
76 .urb_dequeue = ehci_urb_dequeue,
77 .endpoint_disable = ehci_endpoint_disable,
78 .endpoint_reset = ehci_endpoint_reset,
79
80 /* scheduling support */
81 .get_frame_number = ehci_get_frame,
82
83 /* root hub support */
84 .hub_status_data = ehci_hub_status_data,
85 .hub_control = ehci_hub_control,
86 .bus_suspend = ehci_bus_suspend,
87 .bus_resume = ehci_bus_resume,
88 .relinquish_port = ehci_relinquish_port,
89 .port_handed_over = ehci_port_handed_over,
90 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
91};
92
93static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
94{
95 struct usb_hcd *hcd ;
96 struct spear_ehci *ehci;
97 struct resource *res;
98 struct clk *usbh_clk;
99 const struct hc_driver *driver = &ehci_spear_hc_driver;
100 int *pdata = pdev->dev.platform_data;
101 int irq, retval;
102 char clk_name[20] = "usbh_clk";
103
104 if (pdata == NULL)
105 return -EFAULT;
106
107 if (usb_disabled())
108 return -ENODEV;
109
110 irq = platform_get_irq(pdev, 0);
111 if (irq < 0) {
112 retval = irq;
113 goto fail_irq_get;
114 }
115
116 if (*pdata >= 0)
117 sprintf(clk_name, "usbh.%01d_clk", *pdata);
118
119 usbh_clk = clk_get(NULL, clk_name);
120 if (IS_ERR(usbh_clk)) {
121 dev_err(&pdev->dev, "Error getting interface clock\n");
122 retval = PTR_ERR(usbh_clk);
123 goto fail_get_usbh_clk;
124 }
125
126 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
127 if (!hcd) {
128 retval = -ENOMEM;
129 goto fail_create_hcd;
130 }
131
132 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
133 if (!res) {
134 retval = -ENODEV;
135 goto fail_request_resource;
136 }
137
138 hcd->rsrc_start = res->start;
139 hcd->rsrc_len = resource_size(res);
140 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
141 driver->description)) {
142 retval = -EBUSY;
143 goto fail_request_resource;
144 }
145
146 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
147 if (hcd->regs == NULL) {
148 dev_dbg(&pdev->dev, "error mapping memory\n");
149 retval = -ENOMEM;
150 goto fail_ioremap;
151 }
152
153 ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
154 ehci->clk = usbh_clk;
155
156 spear_start_ehci(ehci);
157 retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
158 if (retval)
159 goto fail_add_hcd;
160
161 return retval;
162
163fail_add_hcd:
164 spear_stop_ehci(ehci);
165 iounmap(hcd->regs);
166fail_ioremap:
167 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
168fail_request_resource:
169 usb_put_hcd(hcd);
170fail_create_hcd:
171 clk_put(usbh_clk);
172fail_get_usbh_clk:
173fail_irq_get:
174 dev_err(&pdev->dev, "init fail, %d\n", retval);
175
176 return retval ;
177}
178
179static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
180{
181 struct usb_hcd *hcd = platform_get_drvdata(pdev);
182 struct spear_ehci *ehci_p = to_spear_ehci(hcd);
183
184 if (!hcd)
185 return 0;
186 if (in_interrupt())
187 BUG();
188 usb_remove_hcd(hcd);
189
190 if (ehci_p->clk)
191 spear_stop_ehci(ehci_p);
192 iounmap(hcd->regs);
193 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
194 usb_put_hcd(hcd);
195
196 if (ehci_p->clk)
197 clk_put(ehci_p->clk);
198
199 return 0;
200}
201
202static struct platform_driver spear_ehci_hcd_driver = {
203 .probe = spear_ehci_hcd_drv_probe,
204 .remove = spear_ehci_hcd_drv_remove,
205 .shutdown = usb_hcd_platform_shutdown,
206 .driver = {
207 .name = "spear-ehci",
208 .bus = &platform_bus_type
209 }
210};
211
212MODULE_ALIAS("platform:spear-ehci");
1// SPDX-License-Identifier: GPL-2.0
2/*
3* Driver for EHCI HCD on SPEAr SOC
4*
5* Copyright (C) 2010 ST Micro Electronics,
6* Deepak Sikri <deepak.sikri@st.com>
7*
8* Based on various ehci-*.c drivers
9*/
10
11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/jiffies.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/pm.h>
20#include <linux/usb.h>
21#include <linux/usb/hcd.h>
22
23#include "ehci.h"
24
25#define DRIVER_DESC "EHCI SPEAr driver"
26
27static const char hcd_name[] = "SPEAr-ehci";
28
29struct spear_ehci {
30 struct clk *clk;
31};
32
33#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
34
35static struct hc_driver __read_mostly ehci_spear_hc_driver;
36
37#ifdef CONFIG_PM_SLEEP
38static int ehci_spear_drv_suspend(struct device *dev)
39{
40 struct usb_hcd *hcd = dev_get_drvdata(dev);
41 bool do_wakeup = device_may_wakeup(dev);
42
43 return ehci_suspend(hcd, do_wakeup);
44}
45
46static int ehci_spear_drv_resume(struct device *dev)
47{
48 struct usb_hcd *hcd = dev_get_drvdata(dev);
49
50 ehci_resume(hcd, false);
51 return 0;
52}
53#endif /* CONFIG_PM_SLEEP */
54
55static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
56 ehci_spear_drv_resume);
57
58static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
59{
60 struct usb_hcd *hcd ;
61 struct spear_ehci *sehci;
62 struct resource *res;
63 struct clk *usbh_clk;
64 const struct hc_driver *driver = &ehci_spear_hc_driver;
65 int irq, retval;
66
67 if (usb_disabled())
68 return -ENODEV;
69
70 irq = platform_get_irq(pdev, 0);
71 if (irq < 0) {
72 retval = irq;
73 goto fail;
74 }
75
76 /*
77 * Right now device-tree probed devices don't get dma_mask set.
78 * Since shared usb code relies on it, set it here for now.
79 * Once we have dma capability bindings this can go away.
80 */
81 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
82 if (retval)
83 goto fail;
84
85 usbh_clk = devm_clk_get(&pdev->dev, NULL);
86 if (IS_ERR(usbh_clk)) {
87 dev_err(&pdev->dev, "Error getting interface clock\n");
88 retval = PTR_ERR(usbh_clk);
89 goto fail;
90 }
91
92 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
93 if (!hcd) {
94 retval = -ENOMEM;
95 goto fail;
96 }
97
98 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
100 if (IS_ERR(hcd->regs)) {
101 retval = PTR_ERR(hcd->regs);
102 goto err_put_hcd;
103 }
104 hcd->rsrc_start = res->start;
105 hcd->rsrc_len = resource_size(res);
106
107 sehci = to_spear_ehci(hcd);
108 sehci->clk = usbh_clk;
109
110 /* registers start at offset 0x0 */
111 hcd_to_ehci(hcd)->caps = hcd->regs;
112
113 clk_prepare_enable(sehci->clk);
114 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
115 if (retval)
116 goto err_stop_ehci;
117
118 device_wakeup_enable(hcd->self.controller);
119 return retval;
120
121err_stop_ehci:
122 clk_disable_unprepare(sehci->clk);
123err_put_hcd:
124 usb_put_hcd(hcd);
125fail:
126 dev_err(&pdev->dev, "init fail, %d\n", retval);
127
128 return retval ;
129}
130
131static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
132{
133 struct usb_hcd *hcd = platform_get_drvdata(pdev);
134 struct spear_ehci *sehci = to_spear_ehci(hcd);
135
136 usb_remove_hcd(hcd);
137
138 if (sehci->clk)
139 clk_disable_unprepare(sehci->clk);
140 usb_put_hcd(hcd);
141
142 return 0;
143}
144
145static const struct of_device_id spear_ehci_id_table[] = {
146 { .compatible = "st,spear600-ehci", },
147 { },
148};
149MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
150
151static struct platform_driver spear_ehci_hcd_driver = {
152 .probe = spear_ehci_hcd_drv_probe,
153 .remove = spear_ehci_hcd_drv_remove,
154 .shutdown = usb_hcd_platform_shutdown,
155 .driver = {
156 .name = "spear-ehci",
157 .bus = &platform_bus_type,
158 .pm = &ehci_spear_pm_ops,
159 .of_match_table = spear_ehci_id_table,
160 }
161};
162
163static const struct ehci_driver_overrides spear_overrides __initconst = {
164 .extra_priv_size = sizeof(struct spear_ehci),
165};
166
167static int __init ehci_spear_init(void)
168{
169 if (usb_disabled())
170 return -ENODEV;
171
172 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
173
174 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
175 return platform_driver_register(&spear_ehci_hcd_driver);
176}
177module_init(ehci_spear_init);
178
179static void __exit ehci_spear_cleanup(void)
180{
181 platform_driver_unregister(&spear_ehci_hcd_driver);
182}
183module_exit(ehci_spear_cleanup);
184
185MODULE_DESCRIPTION(DRIVER_DESC);
186MODULE_ALIAS("platform:spear-ehci");
187MODULE_AUTHOR("Deepak Sikri");
188MODULE_LICENSE("GPL");