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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / mfd / omap-usb-tll.c
blob265f5e350e1c7614d83b7a65c2812091e0fb985b
1 // SPDX-License-Identifier: GPL-2.0-only
2 /**
3 * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
4 *
5 * Copyright (C) 2012-2013 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
7 * Author: Roger Quadros <rogerq@ti.com>
8 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/io.h>
17 #include <linux/err.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/platform_data/usb-omap.h>
20 #include <linux/of.h>
21
22 #include "omap-usb.h"
23
24 #define USBTLL_DRIVER_NAME "usbhs_tll"
25
26 /* TLL Register Set */
27 #define OMAP_USBTLL_REVISION (0x00)
28 #define OMAP_USBTLL_SYSCONFIG (0x10)
29 #define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
30 #define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
31 #define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
32 #define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
33 #define OMAP_USBTLL_SYSCONFIG_AUTOIDLE (1 << 0)
34
35 #define OMAP_USBTLL_SYSSTATUS (0x14)
36 #define OMAP_USBTLL_SYSSTATUS_RESETDONE (1 << 0)
37
38 #define OMAP_USBTLL_IRQSTATUS (0x18)
39 #define OMAP_USBTLL_IRQENABLE (0x1C)
40
41 #define OMAP_TLL_SHARED_CONF (0x30)
42 #define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN (1 << 6)
43 #define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN (1 << 5)
44 #define OMAP_TLL_SHARED_CONF_USB_DIVRATION (1 << 2)
45 #define OMAP_TLL_SHARED_CONF_FCLK_REQ (1 << 1)
46 #define OMAP_TLL_SHARED_CONF_FCLK_IS_ON (1 << 0)
47
48 #define OMAP_TLL_CHANNEL_CONF(num) (0x040 + 0x004 * num)
49 #define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT 24
50 #define OMAP_TLL_CHANNEL_CONF_DRVVBUS (1 << 16)
51 #define OMAP_TLL_CHANNEL_CONF_CHRGVBUS (1 << 15)
52 #define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF (1 << 11)
53 #define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE (1 << 10)
54 #define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE (1 << 9)
55 #define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE (1 << 8)
56 #define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI (2 << 1)
57 #define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS (1 << 1)
58 #define OMAP_TLL_CHANNEL_CONF_CHANEN (1 << 0)
59
60 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0 0x0
61 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM 0x1
62 #define OMAP_TLL_FSLSMODE_3PIN_PHY 0x2
63 #define OMAP_TLL_FSLSMODE_4PIN_PHY 0x3
64 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0 0x4
65 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM 0x5
66 #define OMAP_TLL_FSLSMODE_3PIN_TLL 0x6
67 #define OMAP_TLL_FSLSMODE_4PIN_TLL 0x7
68 #define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0 0xA
69 #define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM 0xB
70
71 #define OMAP_TLL_ULPI_FUNCTION_CTRL(num) (0x804 + 0x100 * num)
72 #define OMAP_TLL_ULPI_INTERFACE_CTRL(num) (0x807 + 0x100 * num)
73 #define OMAP_TLL_ULPI_OTG_CTRL(num) (0x80A + 0x100 * num)
74 #define OMAP_TLL_ULPI_INT_EN_RISE(num) (0x80D + 0x100 * num)
75 #define OMAP_TLL_ULPI_INT_EN_FALL(num) (0x810 + 0x100 * num)
76 #define OMAP_TLL_ULPI_INT_STATUS(num) (0x813 + 0x100 * num)
77 #define OMAP_TLL_ULPI_INT_LATCH(num) (0x814 + 0x100 * num)
78 #define OMAP_TLL_ULPI_DEBUG(num) (0x815 + 0x100 * num)
79 #define OMAP_TLL_ULPI_SCRATCH_REGISTER(num) (0x816 + 0x100 * num)
80
81 #define OMAP_REV2_TLL_CHANNEL_COUNT 2
82 #define OMAP_TLL_CHANNEL_COUNT 3
83 #define OMAP_TLL_CHANNEL_1_EN_MASK (1 << 0)
84 #define OMAP_TLL_CHANNEL_2_EN_MASK (1 << 1)
85 #define OMAP_TLL_CHANNEL_3_EN_MASK (1 << 2)
86
87 /* Values of USBTLL_REVISION - Note: these are not given in the TRM */
88 #define OMAP_USBTLL_REV1 0x00000015 /* OMAP3 */
89 #define OMAP_USBTLL_REV2 0x00000018 /* OMAP 3630 */
90 #define OMAP_USBTLL_REV3 0x00000004 /* OMAP4 */
91 #define OMAP_USBTLL_REV4 0x00000006 /* OMAP5 */
92
93 #define is_ehci_tll_mode(x) (x == OMAP_EHCI_PORT_MODE_TLL)
94
95 /* only PHY and UNUSED modes don't need TLL */
96 #define omap_usb_mode_needs_tll(x) ((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
97 (x) != OMAP_EHCI_PORT_MODE_PHY)
98
99 struct usbtll_omap {
100 void __iomem *base;
101 int nch; /* num. of channels */
102 struct clk *ch_clk[0]; /* must be the last member */
103 };
104
105 /*-------------------------------------------------------------------------*/
106
107 static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
108 static struct device *tll_dev;
109 static DEFINE_SPINLOCK(tll_lock); /* serialize access to tll_dev */
110
111 /*-------------------------------------------------------------------------*/
112
113 static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
114 {
115 writel_relaxed(val, base + reg);
116 }
117
118 static inline u32 usbtll_read(void __iomem *base, u32 reg)
119 {
120 return readl_relaxed(base + reg);
121 }
122
123 static inline void usbtll_writeb(void __iomem *base, u32 reg, u8 val)
124 {
125 writeb_relaxed(val, base + reg);
126 }
127
128 static inline u8 usbtll_readb(void __iomem *base, u32 reg)
129 {
130 return readb_relaxed(base + reg);
131 }
132
133 /*-------------------------------------------------------------------------*/
134
135 static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
136 {
137 switch (pmode) {
138 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
139 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
140 case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
141 case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
142 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
143 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
144 case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
145 case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
146 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
147 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
148 return true;
149
150 default:
151 return false;
152 }
153 }
154
155 /*
156 * convert the port-mode enum to a value we can use in the FSLSMODE
157 * field of USBTLL_CHANNEL_CONF
158 */
159 static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
160 {
161 switch (mode) {
162 case OMAP_USBHS_PORT_MODE_UNUSED:
163 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
164 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
165
166 case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
167 return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;
168
169 case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
170 return OMAP_TLL_FSLSMODE_3PIN_PHY;
171
172 case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
173 return OMAP_TLL_FSLSMODE_4PIN_PHY;
174
175 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
176 return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;
177
178 case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
179 return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;
180
181 case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
182 return OMAP_TLL_FSLSMODE_3PIN_TLL;
183
184 case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
185 return OMAP_TLL_FSLSMODE_4PIN_TLL;
186
187 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
188 return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;
189
190 case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
191 return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
192 default:
193 pr_warn("Invalid port mode, using default\n");
194 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
195 }
196 }
197
198 /**
199 * usbtll_omap_probe - initialize TI-based HCDs
200 *
201 * Allocates basic resources for this USB host controller.
202 */
203 static int usbtll_omap_probe(struct platform_device *pdev)
204 {
205 struct device *dev = &pdev->dev;
206 struct resource *res;
207 struct usbtll_omap *tll;
208 void __iomem *base;
209 int i, nch, ver;
210
211 dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
212
213 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
214 base = devm_ioremap_resource(dev, res);
215 if (IS_ERR(base))
216 return PTR_ERR(base);
217
218 pm_runtime_enable(dev);
219 pm_runtime_get_sync(dev);
220
221 ver = usbtll_read(base, OMAP_USBTLL_REVISION);
222 switch (ver) {
223 case OMAP_USBTLL_REV1:
224 case OMAP_USBTLL_REV4:
225 nch = OMAP_TLL_CHANNEL_COUNT;
226 break;
227 case OMAP_USBTLL_REV2:
228 case OMAP_USBTLL_REV3:
229 nch = OMAP_REV2_TLL_CHANNEL_COUNT;
230 break;
231 default:
232 nch = OMAP_TLL_CHANNEL_COUNT;
233 dev_dbg(dev, "rev 0x%x not recognized, assuming %d channels\n",
234 ver, nch);
235 break;
236 }
237
238 tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]),
239 GFP_KERNEL);
240 if (!tll) {
241 pm_runtime_put_sync(dev);
242 pm_runtime_disable(dev);
243 return -ENOMEM;
244 }
245
246 tll->base = base;
247 tll->nch = nch;
248 platform_set_drvdata(pdev, tll);
249
250 for (i = 0; i < nch; i++) {
251 char clkname[] = "usb_tll_hs_usb_chx_clk";
252
253 snprintf(clkname, sizeof(clkname),
254 "usb_tll_hs_usb_ch%d_clk", i);
255 tll->ch_clk[i] = clk_get(dev, clkname);
256
257 if (IS_ERR(tll->ch_clk[i]))
258 dev_dbg(dev, "can't get clock : %s\n", clkname);
259 else
260 clk_prepare(tll->ch_clk[i]);
261 }
262
263 pm_runtime_put_sync(dev);
264 /* only after this can omap_tll_enable/disable work */
265 spin_lock(&tll_lock);
266 tll_dev = dev;
267 spin_unlock(&tll_lock);
268
269 return 0;
270 }
271
272 /**
273 * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
274 * @pdev: USB Host Controller being removed
275 *
276 * Reverses the effect of usbtll_omap_probe().
277 */
278 static int usbtll_omap_remove(struct platform_device *pdev)
279 {
280 struct usbtll_omap *tll = platform_get_drvdata(pdev);
281 int i;
282
283 spin_lock(&tll_lock);
284 tll_dev = NULL;
285 spin_unlock(&tll_lock);
286
287 for (i = 0; i < tll->nch; i++) {
288 if (!IS_ERR(tll->ch_clk[i])) {
289 clk_unprepare(tll->ch_clk[i]);
290 clk_put(tll->ch_clk[i]);
291 }
292 }
293
294 pm_runtime_disable(&pdev->dev);
295 return 0;
296 }
297
298 static const struct of_device_id usbtll_omap_dt_ids[] = {
299 { .compatible = "ti,usbhs-tll" },
300 { }
301 };
302
303 MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);
304
305 static struct platform_driver usbtll_omap_driver = {
306 .driver = {
307 .name = (char *)usbtll_driver_name,
308 .of_match_table = usbtll_omap_dt_ids,
309 },
310 .probe = usbtll_omap_probe,
311 .remove = usbtll_omap_remove,
312 };
313
314 int omap_tll_init(struct usbhs_omap_platform_data *pdata)
315 {
316 int i;
317 bool needs_tll;
318 unsigned reg;
319 struct usbtll_omap *tll;
320
321 if (!tll_dev)
322 return -ENODEV;
323
324 pm_runtime_get_sync(tll_dev);
325
326 spin_lock(&tll_lock);
327 tll = dev_get_drvdata(tll_dev);
328 needs_tll = false;
329 for (i = 0; i < tll->nch; i++)
330 needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]);
331
332 if (needs_tll) {
333 void __iomem *base = tll->base;
334
335 /* Program Common TLL register */
336 reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
337 reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
338 | OMAP_TLL_SHARED_CONF_USB_DIVRATION);
339 reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
340 reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;
341
342 usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
343
344 /* Enable channels now */
345 for (i = 0; i < tll->nch; i++) {
346 reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));
347
348 if (is_ohci_port(pdata->port_mode[i])) {
349 reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
350 << OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
351 reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
352 } else if (pdata->port_mode[i] ==
353 OMAP_EHCI_PORT_MODE_TLL) {
354 /*
355 * Disable UTMI AutoIdle, BitStuffing
356 * and use SDR Mode. Enable ULPI AutoIdle.
357 */
358 reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
359 | OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
360 reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
361 reg |= OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE;
362 } else if (pdata->port_mode[i] ==
363 OMAP_EHCI_PORT_MODE_HSIC) {
364 /*
365 * HSIC Mode requires UTMI port configurations
366 */
367 reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS
368 | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
369 | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
370 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
371 } else {
372 continue;
373 }
374 reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
375 usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);
376
377 usbtll_writeb(base,
378 OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
379 0xbe);
380 }
381 }
382
383 spin_unlock(&tll_lock);
384 pm_runtime_put_sync(tll_dev);
385
386 return 0;
387 }
388 EXPORT_SYMBOL_GPL(omap_tll_init);
389
390 int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
391 {
392 int i;
393 struct usbtll_omap *tll;
394
395 if (!tll_dev)
396 return -ENODEV;
397
398 pm_runtime_get_sync(tll_dev);
399
400 spin_lock(&tll_lock);
401 tll = dev_get_drvdata(tll_dev);
402
403 for (i = 0; i < tll->nch; i++) {
404 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
405 int r;
406
407 if (IS_ERR(tll->ch_clk[i]))
408 continue;
409
410 r = clk_enable(tll->ch_clk[i]);
411 if (r) {
412 dev_err(tll_dev,
413 "Error enabling ch %d clock: %d\n", i, r);
414 }
415 }
416 }
417
418 spin_unlock(&tll_lock);
419
420 return 0;
421 }
422 EXPORT_SYMBOL_GPL(omap_tll_enable);
423
424 int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
425 {
426 int i;
427 struct usbtll_omap *tll;
428
429 if (!tll_dev)
430 return -ENODEV;
431
432 spin_lock(&tll_lock);
433 tll = dev_get_drvdata(tll_dev);
434
435 for (i = 0; i < tll->nch; i++) {
436 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
437 if (!IS_ERR(tll->ch_clk[i]))
438 clk_disable(tll->ch_clk[i]);
439 }
440 }
441
442 spin_unlock(&tll_lock);
443 pm_runtime_put_sync(tll_dev);
444
445 return 0;
446 }
447 EXPORT_SYMBOL_GPL(omap_tll_disable);
448
449 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
450 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
451 MODULE_LICENSE("GPL v2");
452 MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");
453
454 static int __init omap_usbtll_drvinit(void)
455 {
456 return platform_driver_register(&usbtll_omap_driver);
457 }
458
459 /*
460 * init before usbhs core driver;
461 * The usbtll driver should be initialized before
462 * the usbhs core driver probe function is called.
463 */
464 fs_initcall(omap_usbtll_drvinit);
465
466 static void __exit omap_usbtll_drvexit(void)
467 {
468 platform_driver_unregister(&usbtll_omap_driver);
469 }
470 module_exit(omap_usbtll_drvexit);
Linux with added FPC-III support