1 /*
2 * drivers/usb/host/ohci-pnx4008.c
3 *
4 * driver for Philips PNX4008 USB Host
5 *
6 * Authors: Dmitry Chigirev <source@mvista.com>
7 * Vitaly Wool <vitalywool@gmail.com>
8 *
9 * register initialization is based on code examples provided by Philips
10 * Copyright (c) 2005 Koninklijke Philips Electronics N.V.
11 *
12 * NOTE: This driver does not have suspend/resume functionality
13 * This driver is intended for engineering development purposes only
14 *
15 * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
16 * the terms of the GNU General Public License version 2. This program
17 * is licensed "as is" without any warranty of any kind, whether express
18 * or implied.
19 */
20 #include <linux/clk.h>
21 #include <linux/platform_device.h>
22 #include <linux/i2c.h>
23
24 #include <asm/hardware.h>
25 #include <asm/io.h>
26 #include <asm/mach-types.h>
27
28 #include <asm/arch/platform.h>
29 #include <asm/arch/irqs.h>
30 #include <asm/arch/gpio.h>
31
32 #define USB_CTRL IO_ADDRESS(PNX4008_PWRMAN_BASE + 0x64)
33
34 /* USB_CTRL bit defines */
35 #define USB_SLAVE_HCLK_EN (1 << 24)
36 #define USB_HOST_NEED_CLK_EN (1 << 21)
37
38 #define USB_OTG_CLK_CTRL IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF4)
39 #define USB_OTG_CLK_STAT IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF8)
40
41 /* USB_OTG_CLK_CTRL bit defines */
42 #define AHB_M_CLOCK_ON (1 << 4)
43 #define OTG_CLOCK_ON (1 << 3)
44 #define I2C_CLOCK_ON (1 << 2)
45 #define DEV_CLOCK_ON (1 << 1)
46 #define HOST_CLOCK_ON (1 << 0)
47
48 #define USB_OTG_STAT_CONTROL IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0x110)
49
50 /* USB_OTG_STAT_CONTROL bit defines */
51 #define TRANSPARENT_I2C_EN (1 << 7)
52 #define HOST_EN (1 << 0)
53
54 /* ISP1301 USB transceiver I2C registers */
55 #define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
56
57 #define MC1_SPEED_REG (1 << 0)
58 #define MC1_SUSPEND_REG (1 << 1)
59 #define MC1_DAT_SE0 (1 << 2)
60 #define MC1_TRANSPARENT (1 << 3)
61 #define MC1_BDIS_ACON_EN (1 << 4)
62 #define MC1_OE_INT_EN (1 << 5)
63 #define MC1_UART_EN (1 << 6)
64 #define MC1_MASK 0x7f
65
66 #define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
67
68 #define MC2_GLOBAL_PWR_DN (1 << 0)
69 #define MC2_SPD_SUSP_CTRL (1 << 1)
70 #define MC2_BI_DI (1 << 2)
71 #define MC2_TRANSP_BDIR0 (1 << 3)
72 #define MC2_TRANSP_BDIR1 (1 << 4)
73 #define MC2_AUDIO_EN (1 << 5)
74 #define MC2_PSW_EN (1 << 6)
75 #define MC2_EN2V7 (1 << 7)
76
77 #define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
78 # define OTG1_DP_PULLUP (1 << 0)
79 # define OTG1_DM_PULLUP (1 << 1)
80 # define OTG1_DP_PULLDOWN (1 << 2)
81 # define OTG1_DM_PULLDOWN (1 << 3)
82 # define OTG1_ID_PULLDOWN (1 << 4)
83 # define OTG1_VBUS_DRV (1 << 5)
84 # define OTG1_VBUS_DISCHRG (1 << 6)
85 # define OTG1_VBUS_CHRG (1 << 7)
86 #define ISP1301_OTG_STATUS 0x10 /* u8 readonly */
87 # define OTG_B_SESS_END (1 << 6)
88 # define OTG_B_SESS_VLD (1 << 7)
89
90 #define ISP1301_I2C_ADDR 0x2C
91
92 #define ISP1301_I2C_MODE_CONTROL_1 0x4
93 #define ISP1301_I2C_MODE_CONTROL_2 0x12
94 #define ISP1301_I2C_OTG_CONTROL_1 0x6
95 #define ISP1301_I2C_OTG_CONTROL_2 0x10
96 #define ISP1301_I2C_INTERRUPT_SOURCE 0x8
97 #define ISP1301_I2C_INTERRUPT_LATCH 0xA
98 #define ISP1301_I2C_INTERRUPT_FALLING 0xC
99 #define ISP1301_I2C_INTERRUPT_RISING 0xE
100 #define ISP1301_I2C_REG_CLEAR_ADDR 1
101
102 struct i2c_driver isp1301_driver;
103 struct i2c_client *isp1301_i2c_client;
104
105 extern int usb_disabled(void);
106 extern int ocpi_enable(void);
107
108 static struct clk *usb_clk;
109
110 static int isp1301_probe(struct i2c_adapter *adap);
111 static int isp1301_detach(struct i2c_client *client);
112 static int isp1301_command(struct i2c_client *client, unsigned int cmd,
113 void *arg);
114
115 static const unsigned short normal_i2c[] =
116 { ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
117 static const unsigned short dummy_i2c_addrlist[] = { I2C_CLIENT_END };
118
119 static struct i2c_client_address_data addr_data = {
120 .normal_i2c = normal_i2c,
121 .probe = dummy_i2c_addrlist,
122 .ignore = dummy_i2c_addrlist,
123 };
124
125 struct i2c_driver isp1301_driver = {
126 .class = I2C_CLASS_HWMON,
127 .attach_adapter = isp1301_probe,
128 .detach_client = isp1301_detach,
129 .command = isp1301_command
130 };
131
132 static int isp1301_attach(struct i2c_adapter *adap, int addr, int kind)
133 {
134 struct i2c_client *c;
135
136 c = kzalloc(sizeof(*c), GFP_KERNEL);
137
138 if (!c)
139 return -ENOMEM;
140
141 strcpy(c->name, "isp1301");
142 c->flags = 0;
143 c->addr = addr;
144 c->adapter = adap;
145 c->driver = &isp1301_driver;
146
147 isp1301_i2c_client = c;
148
149 return i2c_attach_client(c);
150 }
151
152 static int isp1301_probe(struct i2c_adapter *adap)
153 {
154 return i2c_probe(adap, &addr_data, isp1301_attach);
155 }
156
157 static int isp1301_detach(struct i2c_client *client)
158 {
159 i2c_detach_client(client);
160 kfree(isp1301_i2c_client);
161 return 0;
162 }
163
164 /* No commands defined */
165 static int isp1301_command(struct i2c_client *client, unsigned int cmd,
166 void *arg)
167 {
168 return 0;
169 }
170
171 static void i2c_write(u8 buf, u8 subaddr)
172 {
173 char tmpbuf[2];
174
175 tmpbuf[0] = subaddr; /*register number */
176 tmpbuf[1] = buf; /*register data */
177 i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
178 }
179
180 static void isp1301_configure(void)
181 {
182 /* PNX4008 only supports DAT_SE0 USB mode */
183 /* PNX4008 R2A requires setting the MAX603 to output 3.6V */
184 /* Power up externel charge-pump */
185
186 i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
187 i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
188 ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
189 i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
190 ISP1301_I2C_MODE_CONTROL_2);
191 i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
192 ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
193 i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
194 ISP1301_I2C_OTG_CONTROL_1);
195 i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
196 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
197 i2c_write(0xFF,
198 ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
199 i2c_write(0xFF,
200 ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
201 i2c_write(0xFF,
202 ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);
203
204 }
205
206 static inline void isp1301_vbus_on(void)
207 {
208 i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
209 }
210
211 static inline void isp1301_vbus_off(void)
212 {
213 i2c_write(OTG1_VBUS_DRV,
214 ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
215 }
216
217 static void pnx4008_start_hc(void)
218 {
219 unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
220 __raw_writel(tmp, USB_OTG_STAT_CONTROL);
221 isp1301_vbus_on();
222 }
223
224 static void pnx4008_stop_hc(void)
225 {
226 unsigned long tmp;
227 isp1301_vbus_off();
228 tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
229 __raw_writel(tmp, USB_OTG_STAT_CONTROL);
230 }
231
232 static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
233 {
234 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
235 int ret;
236
237 if ((ret = ohci_init(ohci)) < 0)
238 return ret;
239
240 if ((ret = ohci_run(ohci)) < 0) {
241 dev_err(hcd->self.controller, "can't start\n");
242 ohci_stop(hcd);
243 return ret;
244 }
245 return 0;
246 }
247
248 static const struct hc_driver ohci_pnx4008_hc_driver = {
249 .description = hcd_name,
250 .product_desc = "pnx4008 OHCI",
251
252 /*
253 * generic hardware linkage
254 */
255 .irq = ohci_irq,
256 .flags = HCD_USB11 | HCD_MEMORY,
257
258 .hcd_priv_size = sizeof(struct ohci_hcd),
259 /*
260 * basic lifecycle operations
261 */
262 .start = ohci_pnx4008_start,
263 .stop = ohci_stop,
264 .shutdown = ohci_shutdown,
265
266 /*
267 * managing i/o requests and associated device resources
268 */
269 .urb_enqueue = ohci_urb_enqueue,
270 .urb_dequeue = ohci_urb_dequeue,
271 .endpoint_disable = ohci_endpoint_disable,
272
273 /*
274 * scheduling support
275 */
276 .get_frame_number = ohci_get_frame,
277
278 /*
279 * root hub support
280 */
281 .hub_status_data = ohci_hub_status_data,
282 .hub_control = ohci_hub_control,
283 .hub_irq_enable = ohci_rhsc_enable,
284 #ifdef CONFIG_PM
285 .bus_suspend = ohci_bus_suspend,
286 .bus_resume = ohci_bus_resume,
287 #endif
288 .start_port_reset = ohci_start_port_reset,
289 };
290
291 #define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
292
293 static void pnx4008_set_usb_bits(void)
294 {
295 start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
296 start_int_ack(SE_USB_OTG_ATX_INT_N);
297 start_int_umask(SE_USB_OTG_ATX_INT_N);
298
299 start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
300 start_int_ack(SE_USB_OTG_TIMER_INT);
301 start_int_umask(SE_USB_OTG_TIMER_INT);
302
303 start_int_set_rising_edge(SE_USB_I2C_INT);
304 start_int_ack(SE_USB_I2C_INT);
305 start_int_umask(SE_USB_I2C_INT);
306
307 start_int_set_rising_edge(SE_USB_INT);
308 start_int_ack(SE_USB_INT);
309 start_int_umask(SE_USB_INT);
310
311 start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
312 start_int_ack(SE_USB_NEED_CLK_INT);
313 start_int_umask(SE_USB_NEED_CLK_INT);
314
315 start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
316 start_int_ack(SE_USB_AHB_NEED_CLK_INT);
317 start_int_umask(SE_USB_AHB_NEED_CLK_INT);
318 }
319
320 static void pnx4008_unset_usb_bits(void)
321 {
322 start_int_mask(SE_USB_OTG_ATX_INT_N);
323 start_int_mask(SE_USB_OTG_TIMER_INT);
324 start_int_mask(SE_USB_I2C_INT);
325 start_int_mask(SE_USB_INT);
326 start_int_mask(SE_USB_NEED_CLK_INT);
327 start_int_mask(SE_USB_AHB_NEED_CLK_INT);
328 }
329
330 static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
331 {
332 struct usb_hcd *hcd = 0;
333 struct ohci_hcd *ohci;
334 const struct hc_driver *driver = &ohci_pnx4008_hc_driver;
335
336 int ret = 0, irq;
337
338 dev_dbg(&pdev->dev, "%s: " DRIVER_INFO " (pnx4008)\n", hcd_name);
339 if (usb_disabled()) {
340 err("USB is disabled");
341 ret = -ENODEV;
342 goto out;
343 }
344
345 if (pdev->num_resources != 2
346 || pdev->resource[0].flags != IORESOURCE_MEM
347 || pdev->resource[1].flags != IORESOURCE_IRQ) {
348 err("Invalid resource configuration");
349 ret = -ENODEV;
350 goto out;
351 }
352
353 /* Enable AHB slave USB clock, needed for further USB clock control */
354 __raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
355
356 ret = i2c_add_driver(&isp1301_driver);
357 if (ret < 0) {
358 err("failed to connect I2C to ISP1301 USB Transceiver");
359 goto out;
360 }
361
362 isp1301_configure();
363
364 /* Enable USB PLL */
365 usb_clk = clk_get(&pdev->dev, "ck_pll5");
366 if (IS_ERR(usb_clk)) {
367 err("failed to acquire USB PLL");
368 ret = PTR_ERR(usb_clk);
369 goto out1;
370 }
371
372 ret = clk_enable(usb_clk);
373 if (ret < 0) {
374 err("failed to start USB PLL");
375 goto out2;
376 }
377
378 ret = clk_set_rate(usb_clk, 48000);
379 if (ret < 0) {
380 err("failed to set USB clock rate");
381 goto out3;
382 }
383
384 __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
385
386 /* Set to enable all needed USB clocks */
387 __raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
388
389 while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
390 USB_CLOCK_MASK) ;
391
392 hcd = usb_create_hcd (driver, &pdev->dev, pdev->dev.bus_id);
393 if (!hcd) {
394 err("Failed to allocate HC buffer");
395 ret = -ENOMEM;
396 goto out3;
397 }
398
399 /* Set all USB bits in the Start Enable register */
400 pnx4008_set_usb_bits();
401
402 hcd->rsrc_start = pdev->resource[0].start;
403 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
404 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
405 dev_dbg(&pdev->dev, "request_mem_region failed\n");
406 ret = -ENOMEM;
407 goto out4;
408 }
409 hcd->regs = (void __iomem *)pdev->resource[0].start;
410
411 irq = platform_get_irq(pdev, 0);
412 if (irq < 0) {
413 ret = -ENXIO;
414 goto out4;
415 }
416
417 pnx4008_start_hc();
418 platform_set_drvdata(pdev, hcd);
419 ohci = hcd_to_ohci(hcd);
420 ohci_hcd_init(ohci);
421
422 dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
423 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
424 if (ret == 0)
425 return ret;
426
427 pnx4008_stop_hc();
428 out4:
429 pnx4008_unset_usb_bits();
430 usb_put_hcd(hcd);
431 out3:
432 clk_disable(usb_clk);
433 out2:
434 clk_put(usb_clk);
435 out1:
436 i2c_del_driver(&isp1301_driver);
437 out:
438 return ret;
439 }
440
441 static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
442 {
443 struct usb_hcd *hcd = platform_get_drvdata(pdev);
444
445 usb_remove_hcd(hcd);
446 pnx4008_stop_hc();
447 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
448 usb_put_hcd(hcd);
449 pnx4008_unset_usb_bits();
450 clk_disable(usb_clk);
451 clk_put(usb_clk);
452 i2c_del_driver(&isp1301_driver);
453
454 platform_set_drvdata(pdev, NULL);
455
456 return 0;
457 }
458
459 /* work with hotplug and coldplug */
460 MODULE_ALIAS("platform:usb-ohci");
461
462 static struct platform_driver usb_hcd_pnx4008_driver = {
463 .driver = {
464 .name = "usb-ohci",
465 .owner = THIS_MODULE,
466 },
467 .probe = usb_hcd_pnx4008_probe,
468 .remove = usb_hcd_pnx4008_remove,
469 };
470
471
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