1 /*
2 * linux/arch/arm/mach-pxa/pxa3xx-ulpi.c
3 *
4 * code specific to pxa3xx aka Monahans
5 *
6 * Copyright (C) 2010 CompuLab Ltd.
7 *
8 * 2010-13-07: Igor Grinberg <grinberg@compulab.co.il>
9 * initial version: pxa310 USB Host mode support
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/err.h>
22 #include <linux/io.h>
23 #include <linux/delay.h>
24 #include <linux/clk.h>
25 #include <linux/usb.h>
26 #include <linux/usb/otg.h>
27
28 #include <mach/hardware.h>
29 #include <mach/regs-u2d.h>
30 #include <mach/pxa3xx-u2d.h>
31
32 struct pxa3xx_u2d_ulpi {
33 struct clk *clk;
34 void __iomem *mmio_base;
35
36 struct usb_phy *otg;
37 unsigned int ulpi_mode;
38 };
39
40 static struct pxa3xx_u2d_ulpi *u2d;
41
u2d_readl(u32 reg)42 static inline u32 u2d_readl(u32 reg)
43 {
44 return __raw_readl(u2d->mmio_base + reg);
45 }
46
u2d_writel(u32 reg,u32 val)47 static inline void u2d_writel(u32 reg, u32 val)
48 {
49 __raw_writel(val, u2d->mmio_base + reg);
50 }
51
52 #if defined(CONFIG_PXA310_ULPI)
53 enum u2d_ulpi_phy_mode {
54 SYNCH = 0,
55 CARKIT = (1 << 0),
56 SER_3PIN = (1 << 1),
57 SER_6PIN = (1 << 2),
58 LOWPOWER = (1 << 3),
59 };
60
pxa310_ulpi_get_phymode(void)61 static inline enum u2d_ulpi_phy_mode pxa310_ulpi_get_phymode(void)
62 {
63 return (u2d_readl(U2DOTGUSR) >> 28) & 0xF;
64 }
65
pxa310_ulpi_poll(void)66 static int pxa310_ulpi_poll(void)
67 {
68 int timeout = 50000;
69
70 while (timeout--) {
71 if (!(u2d_readl(U2DOTGUCR) & U2DOTGUCR_RUN))
72 return 0;
73
74 cpu_relax();
75 }
76
77 pr_warning("%s: ULPI access timed out!\n", __func__);
78
79 return -ETIMEDOUT;
80 }
81
pxa310_ulpi_read(struct usb_phy * otg,u32 reg)82 static int pxa310_ulpi_read(struct usb_phy *otg, u32 reg)
83 {
84 int err;
85
86 if (pxa310_ulpi_get_phymode() != SYNCH) {
87 pr_warning("%s: PHY is not in SYNCH mode!\n", __func__);
88 return -EBUSY;
89 }
90
91 u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | U2DOTGUCR_RNW | (reg << 16));
92 msleep(5);
93
94 err = pxa310_ulpi_poll();
95 if (err)
96 return err;
97
98 return u2d_readl(U2DOTGUCR) & U2DOTGUCR_RDATA;
99 }
100
pxa310_ulpi_write(struct usb_phy * otg,u32 val,u32 reg)101 static int pxa310_ulpi_write(struct usb_phy *otg, u32 val, u32 reg)
102 {
103 if (pxa310_ulpi_get_phymode() != SYNCH) {
104 pr_warning("%s: PHY is not in SYNCH mode!\n", __func__);
105 return -EBUSY;
106 }
107
108 u2d_writel(U2DOTGUCR, U2DOTGUCR_RUN | (reg << 16) | (val << 8));
109 msleep(5);
110
111 return pxa310_ulpi_poll();
112 }
113
114 struct usb_phy_io_ops pxa310_ulpi_access_ops = {
115 .read = pxa310_ulpi_read,
116 .write = pxa310_ulpi_write,
117 };
118
pxa310_otg_transceiver_rtsm(void)119 static void pxa310_otg_transceiver_rtsm(void)
120 {
121 u32 u2dotgcr;
122
123 /* put PHY to sync mode */
124 u2dotgcr = u2d_readl(U2DOTGCR);
125 u2dotgcr |= U2DOTGCR_RTSM | U2DOTGCR_UTMID;
126 u2d_writel(U2DOTGCR, u2dotgcr);
127 msleep(10);
128
129 /* setup OTG sync mode */
130 u2dotgcr = u2d_readl(U2DOTGCR);
131 u2dotgcr |= U2DOTGCR_ULAF;
132 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
133 u2d_writel(U2DOTGCR, u2dotgcr);
134 }
135
pxa310_start_otg_host_transcvr(struct usb_bus * host)136 static int pxa310_start_otg_host_transcvr(struct usb_bus *host)
137 {
138 int err;
139
140 pxa310_otg_transceiver_rtsm();
141
142 err = usb_phy_init(u2d->otg);
143 if (err) {
144 pr_err("OTG transceiver init failed");
145 return err;
146 }
147
148 err = otg_set_vbus(u2d->otg->otg, 1);
149 if (err) {
150 pr_err("OTG transceiver VBUS set failed");
151 return err;
152 }
153
154 err = otg_set_host(u2d->otg->otg, host);
155 if (err)
156 pr_err("OTG transceiver Host mode set failed");
157
158 return err;
159 }
160
pxa310_start_otg_hc(struct usb_bus * host)161 static int pxa310_start_otg_hc(struct usb_bus *host)
162 {
163 u32 u2dotgcr;
164 int err;
165
166 /* disable USB device controller */
167 u2d_writel(U2DCR, u2d_readl(U2DCR) & ~U2DCR_UDE);
168 u2d_writel(U2DOTGCR, u2d_readl(U2DOTGCR) | U2DOTGCR_UTMID);
169 u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
170
171 err = pxa310_start_otg_host_transcvr(host);
172 if (err)
173 return err;
174
175 /* set xceiver mode */
176 if (u2d->ulpi_mode & ULPI_IC_6PIN_SERIAL)
177 u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) & ~U2DP3CR_P2SS);
178 else if (u2d->ulpi_mode & ULPI_IC_3PIN_SERIAL)
179 u2d_writel(U2DP3CR, u2d_readl(U2DP3CR) | U2DP3CR_P2SS);
180
181 /* start OTG host controller */
182 u2dotgcr = u2d_readl(U2DOTGCR) | U2DOTGCR_SMAF;
183 u2d_writel(U2DOTGCR, u2dotgcr & ~(U2DOTGCR_ULAF | U2DOTGCR_CKAF));
184
185 return 0;
186 }
187
pxa310_stop_otg_hc(void)188 static void pxa310_stop_otg_hc(void)
189 {
190 pxa310_otg_transceiver_rtsm();
191
192 otg_set_host(u2d->otg->otg, NULL);
193 otg_set_vbus(u2d->otg->otg, 0);
194 usb_phy_shutdown(u2d->otg);
195 }
196
pxa310_u2d_setup_otg_hc(void)197 static void pxa310_u2d_setup_otg_hc(void)
198 {
199 u32 u2dotgcr;
200
201 u2dotgcr = u2d_readl(U2DOTGCR);
202 u2dotgcr |= U2DOTGCR_ULAF | U2DOTGCR_UTMID;
203 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
204 u2d_writel(U2DOTGCR, u2dotgcr);
205 msleep(5);
206 u2d_writel(U2DOTGCR, u2dotgcr | U2DOTGCR_ULE);
207 msleep(5);
208 u2d_writel(U2DOTGICR, u2d_readl(U2DOTGICR) & ~0x37F7F);
209 }
210
pxa310_otg_init(struct pxa3xx_u2d_platform_data * pdata)211 static int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
212 {
213 unsigned int ulpi_mode = ULPI_OTG_DRVVBUS;
214
215 if (pdata) {
216 if (pdata->ulpi_mode & ULPI_SER_6PIN)
217 ulpi_mode |= ULPI_IC_6PIN_SERIAL;
218 else if (pdata->ulpi_mode & ULPI_SER_3PIN)
219 ulpi_mode |= ULPI_IC_3PIN_SERIAL;
220 }
221
222 u2d->ulpi_mode = ulpi_mode;
223
224 u2d->otg = otg_ulpi_create(&pxa310_ulpi_access_ops, ulpi_mode);
225 if (!u2d->otg)
226 return -ENOMEM;
227
228 u2d->otg->io_priv = u2d->mmio_base;
229
230 return 0;
231 }
232
pxa310_otg_exit(void)233 static void pxa310_otg_exit(void)
234 {
235 kfree(u2d->otg);
236 }
237 #else
pxa310_u2d_setup_otg_hc(void)238 static inline void pxa310_u2d_setup_otg_hc(void) {}
pxa310_start_otg_hc(struct usb_bus * host)239 static inline int pxa310_start_otg_hc(struct usb_bus *host)
240 {
241 return 0;
242 }
pxa310_stop_otg_hc(void)243 static inline void pxa310_stop_otg_hc(void) {}
pxa310_otg_init(struct pxa3xx_u2d_platform_data * pdata)244 static inline int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
245 {
246 return 0;
247 }
pxa310_otg_exit(void)248 static inline void pxa310_otg_exit(void) {}
249 #endif /* CONFIG_PXA310_ULPI */
250
pxa3xx_u2d_start_hc(struct usb_bus * host)251 int pxa3xx_u2d_start_hc(struct usb_bus *host)
252 {
253 int err = 0;
254
255 /* In case the PXA3xx ULPI isn't used, do nothing. */
256 if (!u2d)
257 return 0;
258
259 clk_enable(u2d->clk);
260
261 if (cpu_is_pxa310()) {
262 pxa310_u2d_setup_otg_hc();
263 err = pxa310_start_otg_hc(host);
264 }
265
266 return err;
267 }
268 EXPORT_SYMBOL_GPL(pxa3xx_u2d_start_hc);
269
pxa3xx_u2d_stop_hc(struct usb_bus * host)270 void pxa3xx_u2d_stop_hc(struct usb_bus *host)
271 {
272 /* In case the PXA3xx ULPI isn't used, do nothing. */
273 if (!u2d)
274 return;
275
276 if (cpu_is_pxa310())
277 pxa310_stop_otg_hc();
278
279 clk_disable(u2d->clk);
280 }
281 EXPORT_SYMBOL_GPL(pxa3xx_u2d_stop_hc);
282
pxa3xx_u2d_probe(struct platform_device * pdev)283 static int pxa3xx_u2d_probe(struct platform_device *pdev)
284 {
285 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
286 struct resource *r;
287 int err;
288
289 u2d = kzalloc(sizeof(struct pxa3xx_u2d_ulpi), GFP_KERNEL);
290 if (!u2d) {
291 dev_err(&pdev->dev, "failed to allocate memory\n");
292 return -ENOMEM;
293 }
294
295 u2d->clk = clk_get(&pdev->dev, NULL);
296 if (IS_ERR(u2d->clk)) {
297 dev_err(&pdev->dev, "failed to get u2d clock\n");
298 err = PTR_ERR(u2d->clk);
299 goto err_free_mem;
300 }
301
302 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
303 if (!r) {
304 dev_err(&pdev->dev, "no IO memory resource defined\n");
305 err = -ENODEV;
306 goto err_put_clk;
307 }
308
309 r = request_mem_region(r->start, resource_size(r), pdev->name);
310 if (!r) {
311 dev_err(&pdev->dev, "failed to request memory resource\n");
312 err = -EBUSY;
313 goto err_put_clk;
314 }
315
316 u2d->mmio_base = ioremap(r->start, resource_size(r));
317 if (!u2d->mmio_base) {
318 dev_err(&pdev->dev, "ioremap() failed\n");
319 err = -ENODEV;
320 goto err_free_res;
321 }
322
323 if (pdata->init) {
324 err = pdata->init(&pdev->dev);
325 if (err)
326 goto err_free_io;
327 }
328
329 /* Only PXA310 U2D has OTG functionality */
330 if (cpu_is_pxa310()) {
331 err = pxa310_otg_init(pdata);
332 if (err)
333 goto err_free_plat;
334 }
335
336 platform_set_drvdata(pdev, &u2d);
337
338 return 0;
339
340 err_free_plat:
341 if (pdata->exit)
342 pdata->exit(&pdev->dev);
343 err_free_io:
344 iounmap(u2d->mmio_base);
345 err_free_res:
346 release_mem_region(r->start, resource_size(r));
347 err_put_clk:
348 clk_put(u2d->clk);
349 err_free_mem:
350 kfree(u2d);
351 return err;
352 }
353
pxa3xx_u2d_remove(struct platform_device * pdev)354 static int pxa3xx_u2d_remove(struct platform_device *pdev)
355 {
356 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
357 struct resource *r;
358
359 if (cpu_is_pxa310()) {
360 pxa310_stop_otg_hc();
361 pxa310_otg_exit();
362 }
363
364 if (pdata->exit)
365 pdata->exit(&pdev->dev);
366
367 platform_set_drvdata(pdev, NULL);
368 iounmap(u2d->mmio_base);
369 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
370 release_mem_region(r->start, resource_size(r));
371
372 clk_put(u2d->clk);
373
374 kfree(u2d);
375
376 return 0;
377 }
378
379 static struct platform_driver pxa3xx_u2d_ulpi_driver = {
380 .driver = {
381 .name = "pxa3xx-u2d",
382 .owner = THIS_MODULE,
383 },
384 .probe = pxa3xx_u2d_probe,
385 .remove = pxa3xx_u2d_remove,
386 };
387
pxa3xx_u2d_ulpi_init(void)388 static int pxa3xx_u2d_ulpi_init(void)
389 {
390 return platform_driver_register(&pxa3xx_u2d_ulpi_driver);
391 }
392 module_init(pxa3xx_u2d_ulpi_init);
393
pxa3xx_u2d_ulpi_exit(void)394 static void __exit pxa3xx_u2d_ulpi_exit(void)
395 {
396 platform_driver_unregister(&pxa3xx_u2d_ulpi_driver);
397 }
398 module_exit(pxa3xx_u2d_ulpi_exit);
399
400 MODULE_DESCRIPTION("PXA3xx U2D ULPI driver");
401 MODULE_AUTHOR("Igor Grinberg");
402 MODULE_LICENSE("GPL v2");
403