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63c84552 PM |
1 | /* |
2 | * SuperH EHCI host controller driver | |
3 | * | |
4 | * Copyright (C) 2010 Paul Mundt | |
5 | * | |
6 | * Based on ohci-sh.c and ehci-atmel.c. | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
11 | */ | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/clk.h> | |
14 | ||
15 | struct ehci_sh_priv { | |
16 | struct clk *iclk, *fclk; | |
17 | struct usb_hcd *hcd; | |
18 | }; | |
19 | ||
20 | static int ehci_sh_reset(struct usb_hcd *hcd) | |
21 | { | |
22 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
23 | int ret; | |
24 | ||
25 | ehci->caps = hcd->regs; | |
c430131a | 26 | ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, |
63c84552 PM |
27 | &ehci->caps->hc_capbase)); |
28 | ||
29 | dbg_hcs_params(ehci, "reset"); | |
30 | dbg_hcc_params(ehci, "reset"); | |
31 | ||
32 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); | |
33 | ||
34 | ret = ehci_halt(ehci); | |
35 | if (unlikely(ret)) | |
36 | return ret; | |
37 | ||
38 | ret = ehci_init(hcd); | |
39 | if (unlikely(ret)) | |
40 | return ret; | |
41 | ||
42 | ehci->sbrn = 0x20; | |
43 | ||
44 | ehci_reset(ehci); | |
45 | ehci_port_power(ehci, 0); | |
46 | ||
47 | return ret; | |
48 | } | |
49 | ||
50 | static const struct hc_driver ehci_sh_hc_driver = { | |
51 | .description = hcd_name, | |
52 | .product_desc = "SuperH EHCI", | |
53 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
54 | ||
55 | /* | |
56 | * generic hardware linkage | |
57 | */ | |
58 | .irq = ehci_irq, | |
59 | .flags = HCD_USB2 | HCD_MEMORY, | |
60 | ||
61 | /* | |
62 | * basic lifecycle operations | |
63 | */ | |
64 | .reset = ehci_sh_reset, | |
65 | .start = ehci_run, | |
66 | .stop = ehci_stop, | |
67 | .shutdown = ehci_shutdown, | |
68 | ||
69 | /* | |
70 | * managing i/o requests and associated device resources | |
71 | */ | |
72 | .urb_enqueue = ehci_urb_enqueue, | |
73 | .urb_dequeue = ehci_urb_dequeue, | |
74 | .endpoint_disable = ehci_endpoint_disable, | |
6e9d4476 | 75 | .endpoint_reset = ehci_endpoint_reset, |
63c84552 PM |
76 | |
77 | /* | |
78 | * scheduling support | |
79 | */ | |
80 | .get_frame_number = ehci_get_frame, | |
81 | ||
82 | /* | |
83 | * root hub support | |
84 | */ | |
85 | .hub_status_data = ehci_hub_status_data, | |
86 | .hub_control = ehci_hub_control, | |
87 | ||
88 | #ifdef CONFIG_PM | |
89 | .bus_suspend = ehci_bus_suspend, | |
90 | .bus_resume = ehci_bus_resume, | |
91 | #endif | |
92 | ||
93 | .relinquish_port = ehci_relinquish_port, | |
94 | .port_handed_over = ehci_port_handed_over, | |
6e9d4476 | 95 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, |
63c84552 PM |
96 | }; |
97 | ||
98 | static int ehci_hcd_sh_probe(struct platform_device *pdev) | |
99 | { | |
100 | const struct hc_driver *driver = &ehci_sh_hc_driver; | |
101 | struct resource *res; | |
102 | struct ehci_sh_priv *priv; | |
103 | struct usb_hcd *hcd; | |
104 | int irq, ret; | |
105 | ||
106 | if (usb_disabled()) | |
107 | return -ENODEV; | |
108 | ||
109 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
110 | if (!res) { | |
111 | dev_err(&pdev->dev, | |
112 | "Found HC with no register addr. Check %s setup!\n", | |
113 | dev_name(&pdev->dev)); | |
114 | ret = -ENODEV; | |
115 | goto fail_create_hcd; | |
116 | } | |
117 | ||
118 | irq = platform_get_irq(pdev, 0); | |
119 | if (irq <= 0) { | |
120 | dev_err(&pdev->dev, | |
121 | "Found HC with no IRQ. Check %s setup!\n", | |
122 | dev_name(&pdev->dev)); | |
123 | ret = -ENODEV; | |
124 | goto fail_create_hcd; | |
125 | } | |
126 | ||
127 | /* initialize hcd */ | |
128 | hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev, | |
129 | dev_name(&pdev->dev)); | |
130 | if (!hcd) { | |
131 | ret = -ENOMEM; | |
132 | goto fail_create_hcd; | |
133 | } | |
134 | ||
135 | hcd->rsrc_start = res->start; | |
136 | hcd->rsrc_len = resource_size(res); | |
137 | ||
138 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, | |
139 | driver->description)) { | |
140 | dev_dbg(&pdev->dev, "controller already in use\n"); | |
141 | ret = -EBUSY; | |
142 | goto fail_request_resource; | |
143 | } | |
144 | ||
145 | hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); | |
146 | if (hcd->regs == NULL) { | |
147 | dev_dbg(&pdev->dev, "error mapping memory\n"); | |
148 | ret = -ENXIO; | |
149 | goto fail_ioremap; | |
150 | } | |
151 | ||
152 | priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL); | |
153 | if (!priv) { | |
154 | dev_dbg(&pdev->dev, "error allocating priv data\n"); | |
155 | ret = -ENOMEM; | |
156 | goto fail_alloc; | |
157 | } | |
158 | ||
159 | /* These are optional, we don't care if they fail */ | |
160 | priv->fclk = clk_get(&pdev->dev, "usb_fck"); | |
161 | if (IS_ERR(priv->fclk)) | |
162 | priv->fclk = NULL; | |
163 | ||
164 | priv->iclk = clk_get(&pdev->dev, "usb_ick"); | |
165 | if (IS_ERR(priv->iclk)) | |
166 | priv->iclk = NULL; | |
167 | ||
168 | clk_enable(priv->fclk); | |
169 | clk_enable(priv->iclk); | |
170 | ||
b5dd18d8 | 171 | ret = usb_add_hcd(hcd, irq, IRQF_SHARED); |
63c84552 PM |
172 | if (ret != 0) { |
173 | dev_err(&pdev->dev, "Failed to add hcd"); | |
174 | goto fail_add_hcd; | |
175 | } | |
176 | ||
177 | priv->hcd = hcd; | |
178 | platform_set_drvdata(pdev, priv); | |
179 | ||
180 | return ret; | |
181 | ||
182 | fail_add_hcd: | |
183 | clk_disable(priv->iclk); | |
184 | clk_disable(priv->fclk); | |
185 | ||
186 | clk_put(priv->iclk); | |
187 | clk_put(priv->fclk); | |
188 | ||
189 | kfree(priv); | |
190 | fail_alloc: | |
191 | iounmap(hcd->regs); | |
192 | fail_ioremap: | |
193 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
194 | fail_request_resource: | |
195 | usb_put_hcd(hcd); | |
196 | fail_create_hcd: | |
197 | dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret); | |
198 | ||
199 | return ret; | |
200 | } | |
201 | ||
202 | static int __exit ehci_hcd_sh_remove(struct platform_device *pdev) | |
203 | { | |
204 | struct ehci_sh_priv *priv = platform_get_drvdata(pdev); | |
205 | struct usb_hcd *hcd = priv->hcd; | |
206 | ||
207 | usb_remove_hcd(hcd); | |
208 | iounmap(hcd->regs); | |
209 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
210 | usb_put_hcd(hcd); | |
211 | platform_set_drvdata(pdev, NULL); | |
212 | ||
213 | clk_disable(priv->fclk); | |
214 | clk_disable(priv->iclk); | |
215 | ||
216 | clk_put(priv->fclk); | |
217 | clk_put(priv->iclk); | |
218 | ||
219 | kfree(priv); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
c1e0774d PM |
224 | static void ehci_hcd_sh_shutdown(struct platform_device *pdev) |
225 | { | |
226 | struct ehci_sh_priv *priv = platform_get_drvdata(pdev); | |
227 | struct usb_hcd *hcd = priv->hcd; | |
228 | ||
229 | if (hcd->driver->shutdown) | |
230 | hcd->driver->shutdown(hcd); | |
231 | } | |
232 | ||
63c84552 PM |
233 | static struct platform_driver ehci_hcd_sh_driver = { |
234 | .probe = ehci_hcd_sh_probe, | |
235 | .remove = __exit_p(ehci_hcd_sh_remove), | |
c1e0774d | 236 | .shutdown = ehci_hcd_sh_shutdown, |
63c84552 PM |
237 | .driver = { |
238 | .name = "sh_ehci", | |
239 | .owner = THIS_MODULE, | |
240 | }, | |
241 | }; | |
242 | ||
243 | MODULE_ALIAS("platform:sh_ehci"); |