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1bcc5aa8 JS |
1 | /* |
2 | * SAMSUNG S5P USB HOST EHCI Controller | |
3 | * | |
4 | * Copyright (C) 2011 Samsung Electronics Co.Ltd | |
5 | * Author: Jingoo Han <jg1.han@samsung.com> | |
6 | * Author: Joonyoung Shim <jy0922.shim@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/clk.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <mach/regs-pmu.h> | |
18 | #include <plat/cpu.h> | |
19 | #include <plat/ehci.h> | |
20 | #include <plat/usb-phy.h> | |
21 | ||
22 | struct s5p_ehci_hcd { | |
23 | struct device *dev; | |
24 | struct usb_hcd *hcd; | |
25 | struct clk *clk; | |
26 | }; | |
27 | ||
28 | static const struct hc_driver s5p_ehci_hc_driver = { | |
29 | .description = hcd_name, | |
30 | .product_desc = "S5P EHCI Host Controller", | |
31 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
32 | ||
33 | .irq = ehci_irq, | |
34 | .flags = HCD_MEMORY | HCD_USB2, | |
35 | ||
36 | .reset = ehci_init, | |
37 | .start = ehci_run, | |
38 | .stop = ehci_stop, | |
39 | .shutdown = ehci_shutdown, | |
40 | ||
41 | .get_frame_number = ehci_get_frame, | |
42 | ||
43 | .urb_enqueue = ehci_urb_enqueue, | |
44 | .urb_dequeue = ehci_urb_dequeue, | |
45 | .endpoint_disable = ehci_endpoint_disable, | |
46 | .endpoint_reset = ehci_endpoint_reset, | |
47 | ||
48 | .hub_status_data = ehci_hub_status_data, | |
49 | .hub_control = ehci_hub_control, | |
50 | .bus_suspend = ehci_bus_suspend, | |
51 | .bus_resume = ehci_bus_resume, | |
52 | ||
53 | .relinquish_port = ehci_relinquish_port, | |
54 | .port_handed_over = ehci_port_handed_over, | |
55 | ||
56 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
57 | }; | |
58 | ||
59 | static int s5p_ehci_probe(struct platform_device *pdev) | |
60 | { | |
61 | struct s5p_ehci_platdata *pdata; | |
62 | struct s5p_ehci_hcd *s5p_ehci; | |
63 | struct usb_hcd *hcd; | |
64 | struct ehci_hcd *ehci; | |
65 | struct resource *res; | |
66 | int irq; | |
67 | int err; | |
68 | ||
69 | pdata = pdev->dev.platform_data; | |
70 | if (!pdata) { | |
71 | dev_err(&pdev->dev, "No platform data defined\n"); | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
75 | s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL); | |
76 | if (!s5p_ehci) | |
77 | return -ENOMEM; | |
78 | ||
79 | s5p_ehci->dev = &pdev->dev; | |
80 | ||
81 | hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev, | |
82 | dev_name(&pdev->dev)); | |
83 | if (!hcd) { | |
84 | dev_err(&pdev->dev, "Unable to create HCD\n"); | |
85 | err = -ENOMEM; | |
86 | goto fail_hcd; | |
87 | } | |
88 | ||
89 | s5p_ehci->clk = clk_get(&pdev->dev, "usbhost"); | |
90 | ||
91 | if (IS_ERR(s5p_ehci->clk)) { | |
92 | dev_err(&pdev->dev, "Failed to get usbhost clock\n"); | |
93 | err = PTR_ERR(s5p_ehci->clk); | |
94 | goto fail_clk; | |
95 | } | |
96 | ||
97 | err = clk_enable(s5p_ehci->clk); | |
98 | if (err) | |
99 | goto fail_clken; | |
100 | ||
101 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
102 | if (!res) { | |
103 | dev_err(&pdev->dev, "Failed to get I/O memory\n"); | |
104 | err = -ENXIO; | |
105 | goto fail_io; | |
106 | } | |
107 | ||
108 | hcd->rsrc_start = res->start; | |
109 | hcd->rsrc_len = resource_size(res); | |
110 | hcd->regs = ioremap(res->start, resource_size(res)); | |
111 | if (!hcd->regs) { | |
112 | dev_err(&pdev->dev, "Failed to remap I/O memory\n"); | |
113 | err = -ENOMEM; | |
114 | goto fail_io; | |
115 | } | |
116 | ||
117 | irq = platform_get_irq(pdev, 0); | |
118 | if (!irq) { | |
119 | dev_err(&pdev->dev, "Failed to get IRQ\n"); | |
120 | err = -ENODEV; | |
121 | goto fail; | |
122 | } | |
123 | ||
124 | if (pdata->phy_init) | |
125 | pdata->phy_init(pdev, S5P_USB_PHY_HOST); | |
126 | ||
127 | ehci = hcd_to_ehci(hcd); | |
128 | ehci->caps = hcd->regs; | |
129 | ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase)); | |
130 | ||
131 | dbg_hcs_params(ehci, "reset"); | |
132 | dbg_hcc_params(ehci, "reset"); | |
133 | ||
134 | /* cache this readonly data; minimize chip reads */ | |
135 | ehci->hcs_params = readl(&ehci->caps->hcs_params); | |
136 | ||
137 | err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED); | |
138 | if (err) { | |
139 | dev_err(&pdev->dev, "Failed to add USB HCD\n"); | |
140 | goto fail; | |
141 | } | |
142 | ||
143 | platform_set_drvdata(pdev, s5p_ehci); | |
144 | ||
145 | return 0; | |
146 | ||
147 | fail: | |
148 | iounmap(hcd->regs); | |
149 | fail_io: | |
150 | clk_disable(s5p_ehci->clk); | |
151 | fail_clken: | |
152 | clk_put(s5p_ehci->clk); | |
153 | fail_clk: | |
154 | usb_put_hcd(hcd); | |
155 | fail_hcd: | |
156 | kfree(s5p_ehci); | |
157 | return err; | |
158 | } | |
159 | ||
160 | static int s5p_ehci_remove(struct platform_device *pdev) | |
161 | { | |
162 | struct s5p_ehci_platdata *pdata = pdev->dev.platform_data; | |
163 | struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev); | |
164 | struct usb_hcd *hcd = s5p_ehci->hcd; | |
165 | ||
166 | usb_remove_hcd(hcd); | |
167 | ||
168 | if (pdata && pdata->phy_exit) | |
169 | pdata->phy_exit(pdev, S5P_USB_PHY_HOST); | |
170 | ||
171 | iounmap(hcd->regs); | |
172 | ||
173 | clk_disable(s5p_ehci->clk); | |
174 | clk_put(s5p_ehci->clk); | |
175 | ||
176 | usb_put_hcd(hcd); | |
177 | kfree(s5p_ehci); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static void s5p_ehci_shutdown(struct platform_device *pdev) | |
183 | { | |
184 | struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev); | |
185 | struct usb_hcd *hcd = s5p_ehci->hcd; | |
186 | ||
187 | if (hcd->driver->shutdown) | |
188 | hcd->driver->shutdown(hcd); | |
189 | } | |
190 | ||
191 | static struct platform_driver s5p_ehci_driver = { | |
192 | .probe = s5p_ehci_probe, | |
193 | .remove = s5p_ehci_remove, | |
194 | .shutdown = s5p_ehci_shutdown, | |
195 | .driver = { | |
196 | .name = "s5p-ehci", | |
197 | .owner = THIS_MODULE, | |
198 | } | |
199 | }; | |
200 | ||
201 | MODULE_ALIAS("platform:s5p-ehci"); |