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
17 struct 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
spear_start_ehci(struct spear_ehci * ehci)24 static void spear_start_ehci(struct spear_ehci *ehci)
25 {
26 clk_enable(ehci->clk);
27 }
28
spear_stop_ehci(struct spear_ehci * ehci)29 static void spear_stop_ehci(struct spear_ehci *ehci)
30 {
31 clk_disable(ehci->clk);
32 }
33
ehci_spear_setup(struct usb_hcd * hcd)34 static 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_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
59 static 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
spear_ehci_hcd_drv_probe(struct platform_device * pdev)93 static 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
163 fail_add_hcd:
164 spear_stop_ehci(ehci);
165 iounmap(hcd->regs);
166 fail_ioremap:
167 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
168 fail_request_resource:
169 usb_put_hcd(hcd);
170 fail_create_hcd:
171 clk_put(usbh_clk);
172 fail_get_usbh_clk:
173 fail_irq_get:
174 dev_err(&pdev->dev, "init fail, %d\n", retval);
175
176 return retval ;
177 }
178
spear_ehci_hcd_drv_remove(struct platform_device * pdev)179 static 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
202 static 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
212 MODULE_ALIAS("platform:spear-ehci");
213