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c256667f SH |
1 | /* |
2 | * MIPS CI13320A EHCI Host Controller driver | |
3 | * Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com> | |
4 | * | |
5 | * Copyright (C) 2012 MIPS Technologies, Inc. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | * for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software Foundation, | |
19 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
22 | #include <linux/platform_device.h> | |
23 | ||
24 | static int ehci_sead3_setup(struct usb_hcd *hcd) | |
25 | { | |
26 | int ret; | |
27 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
28 | ||
29 | ehci->caps = hcd->regs + 0x100; | |
30 | ||
31 | ret = ehci_setup(hcd); | |
32 | if (ret) | |
33 | return ret; | |
34 | ||
35 | ehci->need_io_watchdog = 0; | |
36 | ||
37 | #ifdef __BIG_ENDIAN | |
38 | ehci->big_endian_mmio = 1; | |
39 | ehci->big_endian_desc = 1; | |
40 | #endif | |
41 | ||
42 | /* Set burst length to 16 words. */ | |
43 | ehci_writel(ehci, 0x1010, &ehci->regs->reserved[1]); | |
44 | ||
45 | return ret; | |
46 | } | |
47 | ||
48 | const struct hc_driver ehci_sead3_hc_driver = { | |
49 | .description = hcd_name, | |
50 | .product_desc = "SEAD-3 EHCI", | |
51 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
52 | ||
53 | /* | |
54 | * generic hardware linkage | |
55 | */ | |
56 | .irq = ehci_irq, | |
57 | .flags = HCD_MEMORY | HCD_USB2, | |
58 | ||
59 | /* | |
60 | * basic lifecycle operations | |
61 | * | |
62 | */ | |
63 | .reset = ehci_sead3_setup, | |
64 | .start = ehci_run, | |
65 | .stop = ehci_stop, | |
66 | .shutdown = ehci_shutdown, | |
67 | ||
68 | /* | |
69 | * managing i/o requests and associated device resources | |
70 | */ | |
71 | .urb_enqueue = ehci_urb_enqueue, | |
72 | .urb_dequeue = ehci_urb_dequeue, | |
73 | .endpoint_disable = ehci_endpoint_disable, | |
74 | .endpoint_reset = ehci_endpoint_reset, | |
75 | ||
76 | /* | |
77 | * scheduling support | |
78 | */ | |
79 | .get_frame_number = ehci_get_frame, | |
80 | ||
81 | /* | |
82 | * root hub support | |
83 | */ | |
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 | ||
91 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
92 | }; | |
93 | ||
94 | static int ehci_hcd_sead3_drv_probe(struct platform_device *pdev) | |
95 | { | |
96 | struct usb_hcd *hcd; | |
97 | struct resource *res; | |
98 | int ret; | |
99 | ||
100 | if (usb_disabled()) | |
101 | return -ENODEV; | |
102 | ||
103 | if (pdev->resource[1].flags != IORESOURCE_IRQ) { | |
104 | pr_debug("resource[1] is not IORESOURCE_IRQ"); | |
105 | return -ENOMEM; | |
106 | } | |
107 | hcd = usb_create_hcd(&ehci_sead3_hc_driver, &pdev->dev, "SEAD-3"); | |
108 | if (!hcd) | |
109 | return -ENOMEM; | |
110 | ||
111 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
112 | hcd->rsrc_start = res->start; | |
113 | hcd->rsrc_len = resource_size(res); | |
114 | ||
115 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | |
116 | pr_debug("request_mem_region failed"); | |
117 | ret = -EBUSY; | |
118 | goto err1; | |
119 | } | |
120 | ||
121 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
122 | if (!hcd->regs) { | |
123 | pr_debug("ioremap failed"); | |
124 | ret = -ENOMEM; | |
125 | goto err2; | |
126 | } | |
127 | ||
128 | /* Root hub has integrated TT. */ | |
129 | hcd->has_tt = 1; | |
130 | ||
131 | ret = usb_add_hcd(hcd, pdev->resource[1].start, | |
132 | IRQF_SHARED); | |
133 | if (ret == 0) { | |
134 | platform_set_drvdata(pdev, hcd); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | iounmap(hcd->regs); | |
139 | err2: | |
140 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
141 | err1: | |
142 | usb_put_hcd(hcd); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | static int ehci_hcd_sead3_drv_remove(struct platform_device *pdev) | |
147 | { | |
148 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
149 | ||
150 | usb_remove_hcd(hcd); | |
151 | iounmap(hcd->regs); | |
152 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
153 | usb_put_hcd(hcd); | |
154 | platform_set_drvdata(pdev, NULL); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | #ifdef CONFIG_PM | |
160 | static int ehci_hcd_sead3_drv_suspend(struct device *dev) | |
161 | { | |
162 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
163 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
164 | unsigned long flags; | |
165 | int rc = 0; | |
166 | ||
167 | if (time_before(jiffies, ehci->next_statechange)) | |
168 | msleep(20); | |
169 | ||
170 | /* Root hub was already suspended. Disable irq emission and | |
171 | * mark HW unaccessible. The PM and USB cores make sure that | |
172 | * the root hub is either suspended or stopped. | |
173 | */ | |
174 | ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev)); | |
175 | spin_lock_irqsave(&ehci->lock, flags); | |
176 | ehci_writel(ehci, 0, &ehci->regs->intr_enable); | |
177 | (void)ehci_readl(ehci, &ehci->regs->intr_enable); | |
178 | ||
179 | clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); | |
180 | spin_unlock_irqrestore(&ehci->lock, flags); | |
181 | ||
182 | /* could save FLADJ in case of Vaux power loss | |
183 | * ... we'd only use it to handle clock skew | |
184 | */ | |
185 | ||
186 | return rc; | |
187 | } | |
188 | ||
189 | static int ehci_hcd_sead3_drv_resume(struct device *dev) | |
190 | { | |
191 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
192 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
193 | ||
194 | /* maybe restore FLADJ. */ | |
195 | ||
196 | if (time_before(jiffies, ehci->next_statechange)) | |
197 | msleep(100); | |
198 | ||
199 | /* Mark hardware accessible again as we are out of D3 state by now */ | |
200 | set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); | |
201 | ||
202 | /* If CF is still set, we maintained PCI Vaux power. | |
203 | * Just undo the effect of ehci_pci_suspend(). | |
204 | */ | |
205 | if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) { | |
206 | int mask = INTR_MASK; | |
207 | ||
208 | ehci_prepare_ports_for_controller_resume(ehci); | |
209 | if (!hcd->self.root_hub->do_remote_wakeup) | |
210 | mask &= ~STS_PCD; | |
211 | ehci_writel(ehci, mask, &ehci->regs->intr_enable); | |
212 | ehci_readl(ehci, &ehci->regs->intr_enable); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | ehci_dbg(ehci, "lost power, restarting\n"); | |
217 | usb_root_hub_lost_power(hcd->self.root_hub); | |
218 | ||
219 | /* Else reset, to cope with power loss or flush-to-storage | |
220 | * style "resume" having let BIOS kick in during reboot. | |
221 | */ | |
222 | (void) ehci_halt(ehci); | |
223 | (void) ehci_reset(ehci); | |
224 | ||
225 | /* emptying the schedule aborts any urbs */ | |
226 | spin_lock_irq(&ehci->lock); | |
227 | if (ehci->reclaim) | |
228 | end_unlink_async(ehci); | |
229 | ehci_work(ehci); | |
230 | spin_unlock_irq(&ehci->lock); | |
231 | ||
232 | ehci_writel(ehci, ehci->command, &ehci->regs->command); | |
233 | ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag); | |
234 | ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */ | |
235 | ||
236 | /* here we "know" root ports should always stay powered */ | |
237 | ehci_port_power(ehci, 1); | |
238 | ||
239 | ehci->rh_state = EHCI_RH_SUSPENDED; | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static const struct dev_pm_ops sead3_ehci_pmops = { | |
245 | .suspend = ehci_hcd_sead3_drv_suspend, | |
246 | .resume = ehci_hcd_sead3_drv_resume, | |
247 | }; | |
248 | ||
249 | #define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops) | |
250 | ||
251 | #else | |
252 | #define SEAD3_EHCI_PMOPS NULL | |
253 | #endif | |
254 | ||
255 | static struct platform_driver ehci_hcd_sead3_driver = { | |
256 | .probe = ehci_hcd_sead3_drv_probe, | |
257 | .remove = ehci_hcd_sead3_drv_remove, | |
258 | .shutdown = usb_hcd_platform_shutdown, | |
259 | .driver = { | |
260 | .name = "sead3-ehci", | |
261 | .owner = THIS_MODULE, | |
262 | .pm = SEAD3_EHCI_PMOPS, | |
263 | } | |
264 | }; | |
265 | ||
266 | MODULE_ALIAS("platform:sead3-ehci"); |