Commit | Line | Data |
---|---|---|
c8c38de9 DS |
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 | ||
c8c38de9 | 14 | #include <linux/clk.h> |
8c1b3693 | 15 | #include <linux/jiffies.h> |
56fafb94 | 16 | #include <linux/of.h> |
8c1b3693 DS |
17 | #include <linux/platform_device.h> |
18 | #include <linux/pm.h> | |
c8c38de9 DS |
19 | |
20 | struct 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 | ||
27 | static void spear_start_ehci(struct spear_ehci *ehci) | |
28 | { | |
15c9d50b | 29 | clk_prepare_enable(ehci->clk); |
c8c38de9 DS |
30 | } |
31 | ||
32 | static void spear_stop_ehci(struct spear_ehci *ehci) | |
33 | { | |
15c9d50b | 34 | clk_disable_unprepare(ehci->clk); |
c8c38de9 DS |
35 | } |
36 | ||
37 | static int ehci_spear_setup(struct usb_hcd *hcd) | |
38 | { | |
39 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
c8c38de9 DS |
40 | |
41 | /* registers start at offset 0x0 */ | |
42 | ehci->caps = hcd->regs; | |
c8c38de9 | 43 | |
c73cee71 | 44 | return ehci_setup(hcd); |
c8c38de9 DS |
45 | } |
46 | ||
47 | static 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 | ||
8c1b3693 DS |
81 | #ifdef CONFIG_PM |
82 | static int ehci_spear_drv_suspend(struct device *dev) | |
83 | { | |
84 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
c5cf9212 AS |
85 | bool do_wakeup = device_may_wakeup(dev); |
86 | ||
87 | return ehci_suspend(hcd, do_wakeup); | |
8c1b3693 DS |
88 | } |
89 | ||
90 | static int ehci_spear_drv_resume(struct device *dev) | |
91 | { | |
92 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
8c1b3693 | 93 | |
c5cf9212 | 94 | ehci_resume(hcd, false); |
8c1b3693 DS |
95 | return 0; |
96 | } | |
97 | #endif /* CONFIG_PM */ | |
98 | ||
99 | static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend, | |
100 | ehci_spear_drv_resume); | |
101 | ||
56fafb94 SR |
102 | static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32); |
103 | ||
c8c38de9 DS |
104 | static 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; | |
c8c38de9 | 111 | int irq, retval; |
c8c38de9 DS |
112 | |
113 | if (usb_disabled()) | |
114 | return -ENODEV; | |
115 | ||
116 | irq = platform_get_irq(pdev, 0); | |
117 | if (irq < 0) { | |
118 | retval = irq; | |
98515e59 | 119 | goto fail; |
c8c38de9 DS |
120 | } |
121 | ||
56fafb94 SR |
122 | /* |
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 | ||
98515e59 | 130 | usbh_clk = devm_clk_get(&pdev->dev, NULL); |
c8c38de9 DS |
131 | if (IS_ERR(usbh_clk)) { |
132 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
133 | retval = PTR_ERR(usbh_clk); | |
98515e59 | 134 | goto fail; |
c8c38de9 DS |
135 | } |
136 | ||
137 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); | |
138 | if (!hcd) { | |
139 | retval = -ENOMEM; | |
98515e59 | 140 | goto fail; |
c8c38de9 DS |
141 | } |
142 | ||
143 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
144 | if (!res) { | |
145 | retval = -ENODEV; | |
98515e59 | 146 | goto err_put_hcd; |
c8c38de9 DS |
147 | } |
148 | ||
149 | hcd->rsrc_start = res->start; | |
150 | hcd->rsrc_len = resource_size(res); | |
98515e59 | 151 | if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len, |
c8c38de9 DS |
152 | driver->description)) { |
153 | retval = -EBUSY; | |
98515e59 | 154 | goto err_put_hcd; |
c8c38de9 DS |
155 | } |
156 | ||
98515e59 | 157 | hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len); |
c8c38de9 DS |
158 | if (hcd->regs == NULL) { |
159 | dev_dbg(&pdev->dev, "error mapping memory\n"); | |
160 | retval = -ENOMEM; | |
98515e59 | 161 | goto err_put_hcd; |
c8c38de9 DS |
162 | } |
163 | ||
164 | ehci = (struct spear_ehci *)hcd_to_ehci(hcd); | |
165 | ehci->clk = usbh_clk; | |
166 | ||
167 | spear_start_ehci(ehci); | |
b5dd18d8 | 168 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
c8c38de9 | 169 | if (retval) |
98515e59 | 170 | goto err_stop_ehci; |
c8c38de9 DS |
171 | |
172 | return retval; | |
173 | ||
98515e59 | 174 | err_stop_ehci: |
c8c38de9 | 175 | spear_stop_ehci(ehci); |
98515e59 | 176 | err_put_hcd: |
c8c38de9 | 177 | usb_put_hcd(hcd); |
98515e59 | 178 | fail: |
c8c38de9 DS |
179 | dev_err(&pdev->dev, "init fail, %d\n", retval); |
180 | ||
181 | return retval ; | |
182 | } | |
183 | ||
184 | static 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); | |
c8c38de9 DS |
197 | usb_put_hcd(hcd); |
198 | ||
c8c38de9 DS |
199 | return 0; |
200 | } | |
201 | ||
d3608b6d | 202 | static struct of_device_id spear_ehci_id_table[] = { |
56fafb94 SR |
203 | { .compatible = "st,spear600-ehci", }, |
204 | { }, | |
205 | }; | |
206 | ||
c8c38de9 DS |
207 | static 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", | |
8c1b3693 DS |
213 | .bus = &platform_bus_type, |
214 | .pm = &ehci_spear_pm_ops, | |
56fafb94 | 215 | .of_match_table = of_match_ptr(spear_ehci_id_table), |
c8c38de9 DS |
216 | } |
217 | }; | |
218 | ||
219 | MODULE_ALIAS("platform:spear-ehci"); |