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[mirror_ubuntu-zesty-kernel.git] / drivers / mfd / omap-usb-tll.c
1 /**
2 * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
3 *
4 * Copyright (C) 2012-2013 Texas Instruments Incorporated - http://www.ti.com
5 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
6 * Author: Roger Quadros <rogerq@ti.com>
7 *
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 of
10 * the License as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/slab.h>
24 #include <linux/spinlock.h>
25 #include <linux/platform_device.h>
26 #include <linux/clk.h>
27 #include <linux/io.h>
28 #include <linux/err.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/platform_data/usb-omap.h>
31 #include <linux/of.h>
32
33 #include "omap-usb.h"
34
35 #define USBTLL_DRIVER_NAME "usbhs_tll"
36
37 /* TLL Register Set */
38 #define OMAP_USBTLL_REVISION (0x00)
39 #define OMAP_USBTLL_SYSCONFIG (0x10)
40 #define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
41 #define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
42 #define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
43 #define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
44 #define OMAP_USBTLL_SYSCONFIG_AUTOIDLE (1 << 0)
45
46 #define OMAP_USBTLL_SYSSTATUS (0x14)
47 #define OMAP_USBTLL_SYSSTATUS_RESETDONE (1 << 0)
48
49 #define OMAP_USBTLL_IRQSTATUS (0x18)
50 #define OMAP_USBTLL_IRQENABLE (0x1C)
51
52 #define OMAP_TLL_SHARED_CONF (0x30)
53 #define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN (1 << 6)
54 #define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN (1 << 5)
55 #define OMAP_TLL_SHARED_CONF_USB_DIVRATION (1 << 2)
56 #define OMAP_TLL_SHARED_CONF_FCLK_REQ (1 << 1)
57 #define OMAP_TLL_SHARED_CONF_FCLK_IS_ON (1 << 0)
58
59 #define OMAP_TLL_CHANNEL_CONF(num) (0x040 + 0x004 * num)
60 #define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT 24
61 #define OMAP_TLL_CHANNEL_CONF_DRVVBUS (1 << 16)
62 #define OMAP_TLL_CHANNEL_CONF_CHRGVBUS (1 << 15)
63 #define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF (1 << 11)
64 #define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE (1 << 10)
65 #define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE (1 << 9)
66 #define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE (1 << 8)
67 #define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI (2 << 1)
68 #define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS (1 << 1)
69 #define OMAP_TLL_CHANNEL_CONF_CHANEN (1 << 0)
70
71 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0 0x0
72 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM 0x1
73 #define OMAP_TLL_FSLSMODE_3PIN_PHY 0x2
74 #define OMAP_TLL_FSLSMODE_4PIN_PHY 0x3
75 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0 0x4
76 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM 0x5
77 #define OMAP_TLL_FSLSMODE_3PIN_TLL 0x6
78 #define OMAP_TLL_FSLSMODE_4PIN_TLL 0x7
79 #define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0 0xA
80 #define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM 0xB
81
82 #define OMAP_TLL_ULPI_FUNCTION_CTRL(num) (0x804 + 0x100 * num)
83 #define OMAP_TLL_ULPI_INTERFACE_CTRL(num) (0x807 + 0x100 * num)
84 #define OMAP_TLL_ULPI_OTG_CTRL(num) (0x80A + 0x100 * num)
85 #define OMAP_TLL_ULPI_INT_EN_RISE(num) (0x80D + 0x100 * num)
86 #define OMAP_TLL_ULPI_INT_EN_FALL(num) (0x810 + 0x100 * num)
87 #define OMAP_TLL_ULPI_INT_STATUS(num) (0x813 + 0x100 * num)
88 #define OMAP_TLL_ULPI_INT_LATCH(num) (0x814 + 0x100 * num)
89 #define OMAP_TLL_ULPI_DEBUG(num) (0x815 + 0x100 * num)
90 #define OMAP_TLL_ULPI_SCRATCH_REGISTER(num) (0x816 + 0x100 * num)
91
92 #define OMAP_REV2_TLL_CHANNEL_COUNT 2
93 #define OMAP_TLL_CHANNEL_COUNT 3
94 #define OMAP_TLL_CHANNEL_1_EN_MASK (1 << 0)
95 #define OMAP_TLL_CHANNEL_2_EN_MASK (1 << 1)
96 #define OMAP_TLL_CHANNEL_3_EN_MASK (1 << 2)
97
98 /* Values of USBTLL_REVISION - Note: these are not given in the TRM */
99 #define OMAP_USBTLL_REV1 0x00000015 /* OMAP3 */
100 #define OMAP_USBTLL_REV2 0x00000018 /* OMAP 3630 */
101 #define OMAP_USBTLL_REV3 0x00000004 /* OMAP4 */
102 #define OMAP_USBTLL_REV4 0x00000006 /* OMAP5 */
103
104 #define is_ehci_tll_mode(x) (x == OMAP_EHCI_PORT_MODE_TLL)
105
106 /* only PHY and UNUSED modes don't need TLL */
107 #define omap_usb_mode_needs_tll(x) ((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
108 (x) != OMAP_EHCI_PORT_MODE_PHY)
109
110 struct usbtll_omap {
111 int nch; /* num. of channels */
112 struct clk **ch_clk;
113 void __iomem *base;
114 };
115
116 /*-------------------------------------------------------------------------*/
117
118 static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
119 static struct device *tll_dev;
120 static DEFINE_SPINLOCK(tll_lock); /* serialize access to tll_dev */
121
122 /*-------------------------------------------------------------------------*/
123
124 static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
125 {
126 writel_relaxed(val, base + reg);
127 }
128
129 static inline u32 usbtll_read(void __iomem *base, u32 reg)
130 {
131 return readl_relaxed(base + reg);
132 }
133
134 static inline void usbtll_writeb(void __iomem *base, u8 reg, u8 val)
135 {
136 writeb_relaxed(val, base + reg);
137 }
138
139 static inline u8 usbtll_readb(void __iomem *base, u8 reg)
140 {
141 return readb_relaxed(base + reg);
142 }
143
144 /*-------------------------------------------------------------------------*/
145
146 static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
147 {
148 switch (pmode) {
149 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
150 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
151 case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
152 case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
153 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
154 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
155 case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
156 case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
157 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
158 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
159 return true;
160
161 default:
162 return false;
163 }
164 }
165
166 /*
167 * convert the port-mode enum to a value we can use in the FSLSMODE
168 * field of USBTLL_CHANNEL_CONF
169 */
170 static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
171 {
172 switch (mode) {
173 case OMAP_USBHS_PORT_MODE_UNUSED:
174 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
175 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
176
177 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
178 return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;
179
180 case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
181 return OMAP_TLL_FSLSMODE_3PIN_PHY;
182
183 case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
184 return OMAP_TLL_FSLSMODE_4PIN_PHY;
185
186 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
187 return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;
188
189 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
190 return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;
191
192 case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
193 return OMAP_TLL_FSLSMODE_3PIN_TLL;
194
195 case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
196 return OMAP_TLL_FSLSMODE_4PIN_TLL;
197
198 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
199 return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;
200
201 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
202 return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
203 default:
204 pr_warn("Invalid port mode, using default\n");
205 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
206 }
207 }
208
209 /**
210 * usbtll_omap_probe - initialize TI-based HCDs
211 *
212 * Allocates basic resources for this USB host controller.
213 */
214 static int usbtll_omap_probe(struct platform_device *pdev)
215 {
216 struct device *dev = &pdev->dev;
217 struct resource *res;
218 struct usbtll_omap *tll;
219 int ret = 0;
220 int i, ver;
221
222 dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
223
224 tll = devm_kzalloc(dev, sizeof(struct usbtll_omap), GFP_KERNEL);
225 if (!tll) {
226 dev_err(dev, "Memory allocation failed\n");
227 return -ENOMEM;
228 }
229
230 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 tll->base = devm_ioremap_resource(dev, res);
232 if (IS_ERR(tll->base))
233 return PTR_ERR(tll->base);
234
235 platform_set_drvdata(pdev, tll);
236 pm_runtime_enable(dev);
237 pm_runtime_get_sync(dev);
238
239 ver = usbtll_read(tll->base, OMAP_USBTLL_REVISION);
240 switch (ver) {
241 case OMAP_USBTLL_REV1:
242 case OMAP_USBTLL_REV4:
243 tll->nch = OMAP_TLL_CHANNEL_COUNT;
244 break;
245 case OMAP_USBTLL_REV2:
246 case OMAP_USBTLL_REV3:
247 tll->nch = OMAP_REV2_TLL_CHANNEL_COUNT;
248 break;
249 default:
250 tll->nch = OMAP_TLL_CHANNEL_COUNT;
251 dev_dbg(dev,
252 "USB TLL Rev : 0x%x not recognized, assuming %d channels\n",
253 ver, tll->nch);
254 break;
255 }
256
257 tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk *) * tll->nch,
258 GFP_KERNEL);
259 if (!tll->ch_clk) {
260 ret = -ENOMEM;
261 dev_err(dev, "Couldn't allocate memory for channel clocks\n");
262 goto err_clk_alloc;
263 }
264
265 for (i = 0; i < tll->nch; i++) {
266 char clkname[] = "usb_tll_hs_usb_chx_clk";
267
268 snprintf(clkname, sizeof(clkname),
269 "usb_tll_hs_usb_ch%d_clk", i);
270 tll->ch_clk[i] = clk_get(dev, clkname);
271
272 if (IS_ERR(tll->ch_clk[i]))
273 dev_dbg(dev, "can't get clock : %s\n", clkname);
274 else
275 clk_prepare(tll->ch_clk[i]);
276 }
277
278 pm_runtime_put_sync(dev);
279 /* only after this can omap_tll_enable/disable work */
280 spin_lock(&tll_lock);
281 tll_dev = dev;
282 spin_unlock(&tll_lock);
283
284 return 0;
285
286 err_clk_alloc:
287 pm_runtime_put_sync(dev);
288 pm_runtime_disable(dev);
289
290 return ret;
291 }
292
293 /**
294 * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
295 * @pdev: USB Host Controller being removed
296 *
297 * Reverses the effect of usbtll_omap_probe().
298 */
299 static int usbtll_omap_remove(struct platform_device *pdev)
300 {
301 struct usbtll_omap *tll = platform_get_drvdata(pdev);
302 int i;
303
304 spin_lock(&tll_lock);
305 tll_dev = NULL;
306 spin_unlock(&tll_lock);
307
308 for (i = 0; i < tll->nch; i++) {
309 if (!IS_ERR(tll->ch_clk[i])) {
310 clk_unprepare(tll->ch_clk[i]);
311 clk_put(tll->ch_clk[i]);
312 }
313 }
314
315 pm_runtime_disable(&pdev->dev);
316 return 0;
317 }
318
319 static const struct of_device_id usbtll_omap_dt_ids[] = {
320 { .compatible = "ti,usbhs-tll" },
321 { }
322 };
323
324 MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);
325
326 static struct platform_driver usbtll_omap_driver = {
327 .driver = {
328 .name = (char *)usbtll_driver_name,
329 .of_match_table = usbtll_omap_dt_ids,
330 },
331 .probe = usbtll_omap_probe,
332 .remove = usbtll_omap_remove,
333 };
334
335 int omap_tll_init(struct usbhs_omap_platform_data *pdata)
336 {
337 int i;
338 bool needs_tll;
339 unsigned reg;
340 struct usbtll_omap *tll;
341
342 if (!tll_dev)
343 return -ENODEV;
344
345 pm_runtime_get_sync(tll_dev);
346
347 spin_lock(&tll_lock);
348 tll = dev_get_drvdata(tll_dev);
349 needs_tll = false;
350 for (i = 0; i < tll->nch; i++)
351 needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]);
352
353 if (needs_tll) {
354 void __iomem *base = tll->base;
355
356 /* Program Common TLL register */
357 reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
358 reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
359 | OMAP_TLL_SHARED_CONF_USB_DIVRATION);
360 reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
361 reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;
362
363 usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
364
365 /* Enable channels now */
366 for (i = 0; i < tll->nch; i++) {
367 reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));
368
369 if (is_ohci_port(pdata->port_mode[i])) {
370 reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
371 << OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
372 reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
373 } else if (pdata->port_mode[i] ==
374 OMAP_EHCI_PORT_MODE_TLL) {
375 /*
376 * Disable AutoIdle, BitStuffing
377 * and use SDR Mode
378 */
379 reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
380 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
381 | OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
382 } else if (pdata->port_mode[i] ==
383 OMAP_EHCI_PORT_MODE_HSIC) {
384 /*
385 * HSIC Mode requires UTMI port configurations
386 */
387 reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS
388 | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
389 | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
390 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
391 } else {
392 continue;
393 }
394 reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
395 usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);
396
397 usbtll_writeb(base,
398 OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
399 0xbe);
400 }
401 }
402
403 spin_unlock(&tll_lock);
404 pm_runtime_put_sync(tll_dev);
405
406 return 0;
407 }
408 EXPORT_SYMBOL_GPL(omap_tll_init);
409
410 int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
411 {
412 int i;
413 struct usbtll_omap *tll;
414
415 if (!tll_dev)
416 return -ENODEV;
417
418 pm_runtime_get_sync(tll_dev);
419
420 spin_lock(&tll_lock);
421 tll = dev_get_drvdata(tll_dev);
422
423 for (i = 0; i < tll->nch; i++) {
424 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
425 int r;
426
427 if (IS_ERR(tll->ch_clk[i]))
428 continue;
429
430 r = clk_enable(tll->ch_clk[i]);
431 if (r) {
432 dev_err(tll_dev,
433 "Error enabling ch %d clock: %d\n", i, r);
434 }
435 }
436 }
437
438 spin_unlock(&tll_lock);
439
440 return 0;
441 }
442 EXPORT_SYMBOL_GPL(omap_tll_enable);
443
444 int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
445 {
446 int i;
447 struct usbtll_omap *tll;
448
449 if (!tll_dev)
450 return -ENODEV;
451
452 spin_lock(&tll_lock);
453 tll = dev_get_drvdata(tll_dev);
454
455 for (i = 0; i < tll->nch; i++) {
456 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
457 if (!IS_ERR(tll->ch_clk[i]))
458 clk_disable(tll->ch_clk[i]);
459 }
460 }
461
462 spin_unlock(&tll_lock);
463 pm_runtime_put_sync(tll_dev);
464
465 return 0;
466 }
467 EXPORT_SYMBOL_GPL(omap_tll_disable);
468
469 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
470 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
471 MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
472 MODULE_LICENSE("GPL v2");
473 MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");
474
475 static int __init omap_usbtll_drvinit(void)
476 {
477 return platform_driver_register(&usbtll_omap_driver);
478 }
479
480 /*
481 * init before usbhs core driver;
482 * The usbtll driver should be initialized before
483 * the usbhs core driver probe function is called.
484 */
485 fs_initcall(omap_usbtll_drvinit);
486
487 static void __exit omap_usbtll_drvexit(void)
488 {
489 platform_driver_unregister(&usbtll_omap_driver);
490 }
491 module_exit(omap_usbtll_drvexit);
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