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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 "regs-u2d.h"
30#include <linux/platform_data/usb-pxa3xx-ulpi.h>
31
32struct 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
40static struct pxa3xx_u2d_ulpi *u2d;
41
42static inline u32 u2d_readl(u32 reg)
43{
44 return __raw_readl(u2d->mmio_base + reg);
45}
46
47static 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)
53enum 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
61static inline enum u2d_ulpi_phy_mode pxa310_ulpi_get_phymode(void)
62{
63 return (u2d_readl(U2DOTGUSR) >> 28) & 0xF;
64}
65
66static 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_warn("%s: ULPI access timed out!\n", __func__);
78
79 return -ETIMEDOUT;
80}
81
82static int pxa310_ulpi_read(struct usb_phy *otg, u32 reg)
83{
84 int err;
85
86 if (pxa310_ulpi_get_phymode() != SYNCH) {
87 pr_warn("%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
101static int pxa310_ulpi_write(struct usb_phy *otg, u32 val, u32 reg)
102{
103 if (pxa310_ulpi_get_phymode() != SYNCH) {
104 pr_warn("%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
114struct usb_phy_io_ops pxa310_ulpi_access_ops = {
115 .read = pxa310_ulpi_read,
116 .write = pxa310_ulpi_write,
117};
118
119static void pxa310_otg_transceiver_rtsm(void)
120{
121 u32 u2dotgcr;
122
123
124 u2dotgcr = u2d_readl(U2DOTGCR);
125 u2dotgcr |= U2DOTGCR_RTSM | U2DOTGCR_UTMID;
126 u2d_writel(U2DOTGCR, u2dotgcr);
127 msleep(10);
128
129
130 u2dotgcr = u2d_readl(U2DOTGCR);
131 u2dotgcr |= U2DOTGCR_ULAF;
132 u2dotgcr &= ~(U2DOTGCR_SMAF | U2DOTGCR_CKAF);
133 u2d_writel(U2DOTGCR, u2dotgcr);
134}
135
136static 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
161static int pxa310_start_otg_hc(struct usb_bus *host)
162{
163 u32 u2dotgcr;
164 int err;
165
166
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
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
182 u2dotgcr = u2d_readl(U2DOTGCR) | U2DOTGCR_SMAF;
183 u2d_writel(U2DOTGCR, u2dotgcr & ~(U2DOTGCR_ULAF | U2DOTGCR_CKAF));
184
185 return 0;
186}
187
188static 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
197static 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
211static 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
233static void pxa310_otg_exit(void)
234{
235 kfree(u2d->otg);
236}
237#else
238static inline void pxa310_u2d_setup_otg_hc(void) {}
239static inline int pxa310_start_otg_hc(struct usb_bus *host)
240{
241 return 0;
242}
243static inline void pxa310_stop_otg_hc(void) {}
244static inline int pxa310_otg_init(struct pxa3xx_u2d_platform_data *pdata)
245{
246 return 0;
247}
248static inline void pxa310_otg_exit(void) {}
249#endif
250
251int pxa3xx_u2d_start_hc(struct usb_bus *host)
252{
253 int err = 0;
254
255
256 if (!u2d)
257 return 0;
258
259 clk_prepare_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}
268EXPORT_SYMBOL_GPL(pxa3xx_u2d_start_hc);
269
270void pxa3xx_u2d_stop_hc(struct usb_bus *host)
271{
272
273 if (!u2d)
274 return;
275
276 if (cpu_is_pxa310())
277 pxa310_stop_otg_hc();
278
279 clk_disable_unprepare(u2d->clk);
280}
281EXPORT_SYMBOL_GPL(pxa3xx_u2d_stop_hc);
282
283static 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(*u2d), GFP_KERNEL);
290 if (!u2d)
291 return -ENOMEM;
292
293 u2d->clk = clk_get(&pdev->dev, NULL);
294 if (IS_ERR(u2d->clk)) {
295 dev_err(&pdev->dev, "failed to get u2d clock\n");
296 err = PTR_ERR(u2d->clk);
297 goto err_free_mem;
298 }
299
300 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
301 if (!r) {
302 dev_err(&pdev->dev, "no IO memory resource defined\n");
303 err = -ENODEV;
304 goto err_put_clk;
305 }
306
307 r = request_mem_region(r->start, resource_size(r), pdev->name);
308 if (!r) {
309 dev_err(&pdev->dev, "failed to request memory resource\n");
310 err = -EBUSY;
311 goto err_put_clk;
312 }
313
314 u2d->mmio_base = ioremap(r->start, resource_size(r));
315 if (!u2d->mmio_base) {
316 dev_err(&pdev->dev, "ioremap() failed\n");
317 err = -ENODEV;
318 goto err_free_res;
319 }
320
321 if (pdata->init) {
322 err = pdata->init(&pdev->dev);
323 if (err)
324 goto err_free_io;
325 }
326
327
328 if (cpu_is_pxa310()) {
329 err = pxa310_otg_init(pdata);
330 if (err)
331 goto err_free_plat;
332 }
333
334 platform_set_drvdata(pdev, u2d);
335
336 return 0;
337
338err_free_plat:
339 if (pdata->exit)
340 pdata->exit(&pdev->dev);
341err_free_io:
342 iounmap(u2d->mmio_base);
343err_free_res:
344 release_mem_region(r->start, resource_size(r));
345err_put_clk:
346 clk_put(u2d->clk);
347err_free_mem:
348 kfree(u2d);
349 return err;
350}
351
352static int pxa3xx_u2d_remove(struct platform_device *pdev)
353{
354 struct pxa3xx_u2d_platform_data *pdata = pdev->dev.platform_data;
355 struct resource *r;
356
357 if (cpu_is_pxa310()) {
358 pxa310_stop_otg_hc();
359 pxa310_otg_exit();
360 }
361
362 if (pdata->exit)
363 pdata->exit(&pdev->dev);
364
365 platform_set_drvdata(pdev, NULL);
366 iounmap(u2d->mmio_base);
367 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
368 release_mem_region(r->start, resource_size(r));
369
370 clk_put(u2d->clk);
371
372 kfree(u2d);
373
374 return 0;
375}
376
377static struct platform_driver pxa3xx_u2d_ulpi_driver = {
378 .driver = {
379 .name = "pxa3xx-u2d",
380 },
381 .probe = pxa3xx_u2d_probe,
382 .remove = pxa3xx_u2d_remove,
383};
384module_platform_driver(pxa3xx_u2d_ulpi_driver);
385
386MODULE_DESCRIPTION("PXA3xx U2D ULPI driver");
387MODULE_AUTHOR("Igor Grinberg");
388MODULE_LICENSE("GPL v2");
389
