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Deepak Sikric8c38de2010-11-10 14:33:18 +05301/*
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
Deepak Sikric8c38de2010-11-10 14:33:18 +053014#include <linux/clk.h>
Deepak Sikri8c1b3692012-02-24 14:49:31 +053015#include <linux/jiffies.h>
Stefan Roese56fafb92012-04-16 09:08:08 +053016#include <linux/of.h>
Deepak Sikri8c1b3692012-02-24 14:49:31 +053017#include <linux/platform_device.h>
18#include <linux/pm.h>
Deepak Sikric8c38de2010-11-10 14:33:18 +053019
20struct spear_ehci {
21 struct ehci_hcd ehci;
22 struct clk *clk;
23};
24
25#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
26
27static void spear_start_ehci(struct spear_ehci *ehci)
28{
Viresh Kumar15c9d502012-04-17 17:08:50 +053029 clk_prepare_enable(ehci->clk);
Deepak Sikric8c38de2010-11-10 14:33:18 +053030}
31
32static void spear_stop_ehci(struct spear_ehci *ehci)
33{
Viresh Kumar15c9d502012-04-17 17:08:50 +053034 clk_disable_unprepare(ehci->clk);
Deepak Sikric8c38de2010-11-10 14:33:18 +053035}
36
37static int ehci_spear_setup(struct usb_hcd *hcd)
38{
39 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
Deepak Sikric8c38de2010-11-10 14:33:18 +053040
41 /* registers start at offset 0x0 */
42 ehci->caps = hcd->regs;
Alan Stern1a49e2a2012-07-09 15:55:14 -040043
Alan Sternc73cee72012-10-31 13:21:06 -040044 return ehci_setup(hcd);
Deepak Sikric8c38de2010-11-10 14:33:18 +053045}
46
47static const struct hc_driver ehci_spear_hc_driver = {
48 .description = hcd_name,
49 .product_desc = "SPEAr EHCI",
50 .hcd_priv_size = sizeof(struct spear_ehci),
51
52 /* generic hardware linkage */
53 .irq = ehci_irq,
54 .flags = HCD_MEMORY | HCD_USB2,
55
56 /* basic lifecycle operations */
57 .reset = ehci_spear_setup,
58 .start = ehci_run,
59 .stop = ehci_stop,
60 .shutdown = ehci_shutdown,
61
62 /* managing i/o requests and associated device resources */
63 .urb_enqueue = ehci_urb_enqueue,
64 .urb_dequeue = ehci_urb_dequeue,
65 .endpoint_disable = ehci_endpoint_disable,
66 .endpoint_reset = ehci_endpoint_reset,
67
68 /* scheduling support */
69 .get_frame_number = ehci_get_frame,
70
71 /* root hub support */
72 .hub_status_data = ehci_hub_status_data,
73 .hub_control = ehci_hub_control,
74 .bus_suspend = ehci_bus_suspend,
75 .bus_resume = ehci_bus_resume,
76 .relinquish_port = ehci_relinquish_port,
77 .port_handed_over = ehci_port_handed_over,
78 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
79};
80
Deepak Sikri8c1b3692012-02-24 14:49:31 +053081#ifdef CONFIG_PM
82static int ehci_spear_drv_suspend(struct device *dev)
83{
84 struct usb_hcd *hcd = dev_get_drvdata(dev);
Alan Sternc5cf9212012-06-28 11:19:02 -040085 bool do_wakeup = device_may_wakeup(dev);
Deepak Sikri8c1b3692012-02-24 14:49:31 +053086
Alan Sternc5cf9212012-06-28 11:19:02 -040087 return ehci_suspend(hcd, do_wakeup);
Deepak Sikri8c1b3692012-02-24 14:49:31 +053088}
89
90static int ehci_spear_drv_resume(struct device *dev)
91{
92 struct usb_hcd *hcd = dev_get_drvdata(dev);
Deepak Sikri8c1b3692012-02-24 14:49:31 +053093
Alan Sternc5cf9212012-06-28 11:19:02 -040094 ehci_resume(hcd, false);
Deepak Sikri8c1b3692012-02-24 14:49:31 +053095 return 0;
96}
97#endif /* CONFIG_PM */
98
99static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
100 ehci_spear_drv_resume);
101
Stefan Roese56fafb92012-04-16 09:08:08 +0530102static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32);
103
Deepak Sikric8c38de2010-11-10 14:33:18 +0530104static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
105{
106 struct usb_hcd *hcd ;
107 struct spear_ehci *ehci;
108 struct resource *res;
109 struct clk *usbh_clk;
110 const struct hc_driver *driver = &ehci_spear_hc_driver;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530111 int irq, retval;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530112
113 if (usb_disabled())
114 return -ENODEV;
115
116 irq = platform_get_irq(pdev, 0);
117 if (irq < 0) {
118 retval = irq;
Viresh Kumar98515e52012-11-08 20:37:59 +0530119 goto fail;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530120 }
121
Stefan Roese56fafb92012-04-16 09:08:08 +0530122 /*
123 * Right now device-tree probed devices don't get dma_mask set.
124 * Since shared usb code relies on it, set it here for now.
125 * Once we have dma capability bindings this can go away.
126 */
127 if (!pdev->dev.dma_mask)
128 pdev->dev.dma_mask = &spear_ehci_dma_mask;
129
Viresh Kumar98515e52012-11-08 20:37:59 +0530130 usbh_clk = devm_clk_get(&pdev->dev, NULL);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530131 if (IS_ERR(usbh_clk)) {
132 dev_err(&pdev->dev, "Error getting interface clock\n");
133 retval = PTR_ERR(usbh_clk);
Viresh Kumar98515e52012-11-08 20:37:59 +0530134 goto fail;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530135 }
136
137 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
138 if (!hcd) {
139 retval = -ENOMEM;
Viresh Kumar98515e52012-11-08 20:37:59 +0530140 goto fail;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530141 }
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 if (!res) {
145 retval = -ENODEV;
Viresh Kumar98515e52012-11-08 20:37:59 +0530146 goto err_put_hcd;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530147 }
148
149 hcd->rsrc_start = res->start;
150 hcd->rsrc_len = resource_size(res);
Viresh Kumar98515e52012-11-08 20:37:59 +0530151 if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
Deepak Sikric8c38de2010-11-10 14:33:18 +0530152 driver->description)) {
153 retval = -EBUSY;
Viresh Kumar98515e52012-11-08 20:37:59 +0530154 goto err_put_hcd;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530155 }
156
Viresh Kumar98515e52012-11-08 20:37:59 +0530157 hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530158 if (hcd->regs == NULL) {
159 dev_dbg(&pdev->dev, "error mapping memory\n");
160 retval = -ENOMEM;
Viresh Kumar98515e52012-11-08 20:37:59 +0530161 goto err_put_hcd;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530162 }
163
164 ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
165 ehci->clk = usbh_clk;
166
167 spear_start_ehci(ehci);
Yong Zhangb5dd18d2011-09-07 16:10:52 +0800168 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530169 if (retval)
Viresh Kumar98515e52012-11-08 20:37:59 +0530170 goto err_stop_ehci;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530171
172 return retval;
173
Viresh Kumar98515e52012-11-08 20:37:59 +0530174err_stop_ehci:
Deepak Sikric8c38de2010-11-10 14:33:18 +0530175 spear_stop_ehci(ehci);
Viresh Kumar98515e52012-11-08 20:37:59 +0530176err_put_hcd:
Deepak Sikric8c38de2010-11-10 14:33:18 +0530177 usb_put_hcd(hcd);
Viresh Kumar98515e52012-11-08 20:37:59 +0530178fail:
Deepak Sikric8c38de2010-11-10 14:33:18 +0530179 dev_err(&pdev->dev, "init fail, %d\n", retval);
180
181 return retval ;
182}
183
184static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
185{
186 struct usb_hcd *hcd = platform_get_drvdata(pdev);
187 struct spear_ehci *ehci_p = to_spear_ehci(hcd);
188
189 if (!hcd)
190 return 0;
191 if (in_interrupt())
192 BUG();
193 usb_remove_hcd(hcd);
194
195 if (ehci_p->clk)
196 spear_stop_ehci(ehci_p);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530197 usb_put_hcd(hcd);
198
Deepak Sikric8c38de2010-11-10 14:33:18 +0530199 return 0;
200}
201
Stefan Roese56fafb92012-04-16 09:08:08 +0530202static struct of_device_id spear_ehci_id_table[] __devinitdata = {
203 { .compatible = "st,spear600-ehci", },
204 { },
205};
206
Deepak Sikric8c38de2010-11-10 14:33:18 +0530207static struct platform_driver spear_ehci_hcd_driver = {
208 .probe = spear_ehci_hcd_drv_probe,
209 .remove = spear_ehci_hcd_drv_remove,
210 .shutdown = usb_hcd_platform_shutdown,
211 .driver = {
212 .name = "spear-ehci",
Deepak Sikri8c1b3692012-02-24 14:49:31 +0530213 .bus = &platform_bus_type,
214 .pm = &ehci_spear_pm_ops,
Stefan Roese56fafb92012-04-16 09:08:08 +0530215 .of_match_table = of_match_ptr(spear_ehci_id_table),
Deepak Sikric8c38de2010-11-10 14:33:18 +0530216 }
217};
218
219MODULE_ALIAS("platform:spear-ehci");