1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * OHCI HCD(Host Controller Driver) for USB.
4 *
5 *(C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
6 *(C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7 *(C) Copyright 2002 Hewlett-Packard Company
8 *
9 * Bus glue for Toshiba Mobile IO(TMIO) Controller's OHCI core
10 * (C) Copyright 2005 Chris Humbert <mahadri-usb@drigon.com>
11 * (C) Copyright 2007, 2008 Dmitry Baryshkov <dbaryshkov@gmail.com>
12 *
13 * This is known to work with the following variants:
14 * TC6393XB revision 3 (32kB SRAM)
15 *
16 * The TMIO's OHCI core DMAs through a small internal buffer that
17 * is directly addressable by the CPU.
18 *
19 * Written from sparse documentation from Toshiba and Sharp's driver
20 * for the 2.4 kernel,
21 * usb-ohci-tc6393.c(C) Copyright 2004 Lineo Solutions, Inc.
22 */
23
24 /*#include <linux/fs.h>
25 #include <linux/mount.h>
26 #include <linux/pagemap.h>
27 #include <linux/namei.h>
28 #include <linux/sched.h>*/
29 #include <linux/platform_device.h>
30 #include <linux/mfd/core.h>
31 #include <linux/mfd/tmio.h>
32 #include <linux/dma-mapping.h>
33
34 /*-------------------------------------------------------------------------*/
35
36 /*
37 * USB Host Controller Configuration Register
38 */
39 #define CCR_REVID 0x08 /* b Revision ID */
40 #define CCR_BASE 0x10 /* l USB Control Register Base Address Low */
41 #define CCR_ILME 0x40 /* b Internal Local Memory Enable */
42 #define CCR_PM 0x4c /* w Power Management */
43 #define CCR_INTC 0x50 /* b INT Control */
44 #define CCR_LMW1L 0x54 /* w Local Memory Window 1 LMADRS Low */
45 #define CCR_LMW1H 0x56 /* w Local Memory Window 1 LMADRS High */
46 #define CCR_LMW1BL 0x58 /* w Local Memory Window 1 Base Address Low */
47 #define CCR_LMW1BH 0x5A /* w Local Memory Window 1 Base Address High */
48 #define CCR_LMW2L 0x5C /* w Local Memory Window 2 LMADRS Low */
49 #define CCR_LMW2H 0x5E /* w Local Memory Window 2 LMADRS High */
50 #define CCR_LMW2BL 0x60 /* w Local Memory Window 2 Base Address Low */
51 #define CCR_LMW2BH 0x62 /* w Local Memory Window 2 Base Address High */
52 #define CCR_MISC 0xFC /* b MISC */
53
54 #define CCR_PM_GKEN 0x0001
55 #define CCR_PM_CKRNEN 0x0002
56 #define CCR_PM_USBPW1 0x0004
57 #define CCR_PM_USBPW2 0x0008
58 #define CCR_PM_USBPW3 0x0010
59 #define CCR_PM_PMEE 0x0100
60 #define CCR_PM_PMES 0x8000
61
62 /*-------------------------------------------------------------------------*/
63
64 struct tmio_hcd {
65 void __iomem *ccr;
66 spinlock_t lock; /* protects RMW cycles */
67 };
68
69 #define hcd_to_tmio(hcd) ((struct tmio_hcd *)(hcd_to_ohci(hcd) + 1))
70
71 /*-------------------------------------------------------------------------*/
72
tmio_write_pm(struct platform_device * dev)73 static void tmio_write_pm(struct platform_device *dev)
74 {
75 struct usb_hcd *hcd = platform_get_drvdata(dev);
76 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
77 u16 pm;
78 unsigned long flags;
79
80 spin_lock_irqsave(&tmio->lock, flags);
81
82 pm = CCR_PM_GKEN | CCR_PM_CKRNEN |
83 CCR_PM_PMEE | CCR_PM_PMES;
84
85 tmio_iowrite16(pm, tmio->ccr + CCR_PM);
86 spin_unlock_irqrestore(&tmio->lock, flags);
87 }
88
tmio_stop_hc(struct platform_device * dev)89 static void tmio_stop_hc(struct platform_device *dev)
90 {
91 struct usb_hcd *hcd = platform_get_drvdata(dev);
92 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
93 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
94 u16 pm;
95
96 pm = CCR_PM_GKEN | CCR_PM_CKRNEN;
97 switch (ohci->num_ports) {
98 default:
99 dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
100 fallthrough;
101 case 3:
102 pm |= CCR_PM_USBPW3;
103 fallthrough;
104 case 2:
105 pm |= CCR_PM_USBPW2;
106 fallthrough;
107 case 1:
108 pm |= CCR_PM_USBPW1;
109 }
110 tmio_iowrite8(0, tmio->ccr + CCR_INTC);
111 tmio_iowrite8(0, tmio->ccr + CCR_ILME);
112 tmio_iowrite16(0, tmio->ccr + CCR_BASE);
113 tmio_iowrite16(0, tmio->ccr + CCR_BASE + 2);
114 tmio_iowrite16(pm, tmio->ccr + CCR_PM);
115 }
116
tmio_start_hc(struct platform_device * dev)117 static void tmio_start_hc(struct platform_device *dev)
118 {
119 struct usb_hcd *hcd = platform_get_drvdata(dev);
120 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
121 unsigned long base = hcd->rsrc_start;
122
123 tmio_write_pm(dev);
124 tmio_iowrite16(base, tmio->ccr + CCR_BASE);
125 tmio_iowrite16(base >> 16, tmio->ccr + CCR_BASE + 2);
126 tmio_iowrite8(1, tmio->ccr + CCR_ILME);
127 tmio_iowrite8(2, tmio->ccr + CCR_INTC);
128
129 dev_info(&dev->dev, "revision %d @ 0x%08llx, irq %d\n",
130 tmio_ioread8(tmio->ccr + CCR_REVID),
131 (u64) hcd->rsrc_start, hcd->irq);
132 }
133
ohci_tmio_start(struct usb_hcd * hcd)134 static int ohci_tmio_start(struct usb_hcd *hcd)
135 {
136 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
137 int ret;
138
139 if ((ret = ohci_init(ohci)) < 0)
140 return ret;
141
142 if ((ret = ohci_run(ohci)) < 0) {
143 dev_err(hcd->self.controller, "can't start %s\n",
144 hcd->self.bus_name);
145 ohci_stop(hcd);
146 return ret;
147 }
148
149 return 0;
150 }
151
152 static const struct hc_driver ohci_tmio_hc_driver = {
153 .description = hcd_name,
154 .product_desc = "TMIO OHCI USB Host Controller",
155 .hcd_priv_size = sizeof(struct ohci_hcd) + sizeof (struct tmio_hcd),
156
157 /* generic hardware linkage */
158 .irq = ohci_irq,
159 .flags = HCD_USB11 | HCD_MEMORY,
160
161 /* basic lifecycle operations */
162 .start = ohci_tmio_start,
163 .stop = ohci_stop,
164 .shutdown = ohci_shutdown,
165
166 /* managing i/o requests and associated device resources */
167 .urb_enqueue = ohci_urb_enqueue,
168 .urb_dequeue = ohci_urb_dequeue,
169 .endpoint_disable = ohci_endpoint_disable,
170
171 /* scheduling support */
172 .get_frame_number = ohci_get_frame,
173
174 /* root hub support */
175 .hub_status_data = ohci_hub_status_data,
176 .hub_control = ohci_hub_control,
177 #ifdef CONFIG_PM
178 .bus_suspend = ohci_bus_suspend,
179 .bus_resume = ohci_bus_resume,
180 #endif
181 .start_port_reset = ohci_start_port_reset,
182 };
183
184 /*-------------------------------------------------------------------------*/
185 static struct platform_driver ohci_hcd_tmio_driver;
186
ohci_hcd_tmio_drv_probe(struct platform_device * dev)187 static int ohci_hcd_tmio_drv_probe(struct platform_device *dev)
188 {
189 const struct mfd_cell *cell = mfd_get_cell(dev);
190 struct resource *regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
191 struct resource *config = platform_get_resource(dev, IORESOURCE_MEM, 1);
192 struct resource *sram = platform_get_resource(dev, IORESOURCE_MEM, 2);
193 int irq = platform_get_irq(dev, 0);
194 struct tmio_hcd *tmio;
195 struct ohci_hcd *ohci;
196 struct usb_hcd *hcd;
197 int ret;
198
199 if (usb_disabled())
200 return -ENODEV;
201
202 if (!cell || !regs || !config || !sram)
203 return -EINVAL;
204
205 if (irq < 0)
206 return irq;
207
208 hcd = usb_create_hcd(&ohci_tmio_hc_driver, &dev->dev, dev_name(&dev->dev));
209 if (!hcd) {
210 ret = -ENOMEM;
211 goto err_usb_create_hcd;
212 }
213
214 hcd->rsrc_start = regs->start;
215 hcd->rsrc_len = resource_size(regs);
216
217 tmio = hcd_to_tmio(hcd);
218
219 spin_lock_init(&tmio->lock);
220
221 tmio->ccr = ioremap(config->start, resource_size(config));
222 if (!tmio->ccr) {
223 ret = -ENOMEM;
224 goto err_ioremap_ccr;
225 }
226
227 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
228 if (!hcd->regs) {
229 ret = -ENOMEM;
230 goto err_ioremap_regs;
231 }
232
233 if (cell->enable) {
234 ret = cell->enable(dev);
235 if (ret)
236 goto err_enable;
237 }
238
239 tmio_start_hc(dev);
240 ohci = hcd_to_ohci(hcd);
241 ohci_hcd_init(ohci);
242
243 ret = usb_hcd_setup_local_mem(hcd, sram->start, sram->start,
244 resource_size(sram));
245 if (ret < 0)
246 goto err_enable;
247
248 ret = usb_add_hcd(hcd, irq, 0);
249 if (ret)
250 goto err_add_hcd;
251
252 device_wakeup_enable(hcd->self.controller);
253 if (ret == 0)
254 return ret;
255
256 usb_remove_hcd(hcd);
257
258 err_add_hcd:
259 tmio_stop_hc(dev);
260 if (cell->disable)
261 cell->disable(dev);
262 err_enable:
263 iounmap(hcd->regs);
264 err_ioremap_regs:
265 iounmap(tmio->ccr);
266 err_ioremap_ccr:
267 usb_put_hcd(hcd);
268 err_usb_create_hcd:
269
270 return ret;
271 }
272
ohci_hcd_tmio_drv_remove(struct platform_device * dev)273 static int ohci_hcd_tmio_drv_remove(struct platform_device *dev)
274 {
275 struct usb_hcd *hcd = platform_get_drvdata(dev);
276 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
277 const struct mfd_cell *cell = mfd_get_cell(dev);
278
279 usb_remove_hcd(hcd);
280 tmio_stop_hc(dev);
281 if (cell->disable)
282 cell->disable(dev);
283 iounmap(hcd->regs);
284 iounmap(tmio->ccr);
285 usb_put_hcd(hcd);
286
287 return 0;
288 }
289
290 #ifdef CONFIG_PM
ohci_hcd_tmio_drv_suspend(struct platform_device * dev,pm_message_t state)291 static int ohci_hcd_tmio_drv_suspend(struct platform_device *dev, pm_message_t state)
292 {
293 const struct mfd_cell *cell = mfd_get_cell(dev);
294 struct usb_hcd *hcd = platform_get_drvdata(dev);
295 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
296 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
297 unsigned long flags;
298 u8 misc;
299 int ret;
300
301 if (time_before(jiffies, ohci->next_statechange))
302 msleep(5);
303 ohci->next_statechange = jiffies;
304
305 spin_lock_irqsave(&tmio->lock, flags);
306
307 misc = tmio_ioread8(tmio->ccr + CCR_MISC);
308 misc |= 1 << 3; /* USSUSP */
309 tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
310
311 spin_unlock_irqrestore(&tmio->lock, flags);
312
313 if (cell->suspend) {
314 ret = cell->suspend(dev);
315 if (ret)
316 return ret;
317 }
318 return 0;
319 }
320
ohci_hcd_tmio_drv_resume(struct platform_device * dev)321 static int ohci_hcd_tmio_drv_resume(struct platform_device *dev)
322 {
323 const struct mfd_cell *cell = mfd_get_cell(dev);
324 struct usb_hcd *hcd = platform_get_drvdata(dev);
325 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
326 struct tmio_hcd *tmio = hcd_to_tmio(hcd);
327 unsigned long flags;
328 u8 misc;
329 int ret;
330
331 if (time_before(jiffies, ohci->next_statechange))
332 msleep(5);
333 ohci->next_statechange = jiffies;
334
335 if (cell->resume) {
336 ret = cell->resume(dev);
337 if (ret)
338 return ret;
339 }
340
341 tmio_start_hc(dev);
342
343 spin_lock_irqsave(&tmio->lock, flags);
344
345 misc = tmio_ioread8(tmio->ccr + CCR_MISC);
346 misc &= ~(1 << 3); /* USSUSP */
347 tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
348
349 spin_unlock_irqrestore(&tmio->lock, flags);
350
351 ohci_resume(hcd, false);
352
353 return 0;
354 }
355 #else
356 #define ohci_hcd_tmio_drv_suspend NULL
357 #define ohci_hcd_tmio_drv_resume NULL
358 #endif
359
360 static struct platform_driver ohci_hcd_tmio_driver = {
361 .probe = ohci_hcd_tmio_drv_probe,
362 .remove = ohci_hcd_tmio_drv_remove,
363 .shutdown = usb_hcd_platform_shutdown,
364 .suspend = ohci_hcd_tmio_drv_suspend,
365 .resume = ohci_hcd_tmio_drv_resume,
366 .driver = {
367 .name = "tmio-ohci",
368 },
369 };
370