summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ohci-pnx4008.c
blob: 037956a60bfa7353b58332bd616541cb1ed65485 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
/*
 * drivers/usb/host/ohci-pnx4008.c
 *
 * driver for Philips PNX4008 USB Host
 *
 * Authors: Dmitry Chigirev <source@mvista.com>
 *	    Vitaly Wool <vitalywool@gmail.com>
 *
 * register initialization is based on code examples provided by Philips
 * Copyright (c) 2005 Koninklijke Philips Electronics N.V.
 *
 * NOTE: This driver does not have suspend/resume functionality
 * This driver is intended for engineering development purposes only
 *
 * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

#include <asm/hardware.h>
#include <asm/io.h>

#include <asm/arch/platform.h>
#include <asm/arch/irqs.h>
#include <asm/arch/gpio.h>

#define USB_CTRL	IO_ADDRESS(PNX4008_PWRMAN_BASE + 0x64)

/* USB_CTRL bit defines */
#define USB_SLAVE_HCLK_EN	(1 << 24)
#define USB_HOST_NEED_CLK_EN	(1 << 21)

#define USB_OTG_CLK_CTRL	IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF4)
#define USB_OTG_CLK_STAT	IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF8)

/* USB_OTG_CLK_CTRL bit defines */
#define AHB_M_CLOCK_ON		(1 << 4)
#define OTG_CLOCK_ON		(1 << 3)
#define I2C_CLOCK_ON		(1 << 2)
#define DEV_CLOCK_ON		(1 << 1)
#define HOST_CLOCK_ON		(1 << 0)

#define USB_OTG_STAT_CONTROL	IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0x110)

/* USB_OTG_STAT_CONTROL bit defines */
#define TRANSPARENT_I2C_EN	(1 << 7)
#define HOST_EN			(1 << 0)

/* ISP1301 USB transceiver I2C registers */
#define	ISP1301_MODE_CONTROL_1		0x04	/* u8 read, set, +1 clear */

#define	MC1_SPEED_REG		(1 << 0)
#define	MC1_SUSPEND_REG		(1 << 1)
#define	MC1_DAT_SE0		(1 << 2)
#define	MC1_TRANSPARENT		(1 << 3)
#define	MC1_BDIS_ACON_EN	(1 << 4)
#define	MC1_OE_INT_EN		(1 << 5)
#define	MC1_UART_EN		(1 << 6)
#define	MC1_MASK		0x7f

#define	ISP1301_MODE_CONTROL_2		0x12	/* u8 read, set, +1 clear */

#define	MC2_GLOBAL_PWR_DN	(1 << 0)
#define	MC2_SPD_SUSP_CTRL	(1 << 1)
#define	MC2_BI_DI		(1 << 2)
#define	MC2_TRANSP_BDIR0	(1 << 3)
#define	MC2_TRANSP_BDIR1	(1 << 4)
#define	MC2_AUDIO_EN		(1 << 5)
#define	MC2_PSW_EN		(1 << 6)
#define	MC2_EN2V7		(1 << 7)

#define	ISP1301_OTG_CONTROL_1		0x06	/* u8 read, set, +1 clear */
#	define	OTG1_DP_PULLUP		(1 << 0)
#	define	OTG1_DM_PULLUP		(1 << 1)
#	define	OTG1_DP_PULLDOWN	(1 << 2)
#	define	OTG1_DM_PULLDOWN	(1 << 3)
#	define	OTG1_ID_PULLDOWN	(1 << 4)
#	define	OTG1_VBUS_DRV		(1 << 5)
#	define	OTG1_VBUS_DISCHRG	(1 << 6)
#	define	OTG1_VBUS_CHRG		(1 << 7)
#define	ISP1301_OTG_STATUS		0x10	/* u8 readonly */
#	define	OTG_B_SESS_END		(1 << 6)
#	define	OTG_B_SESS_VLD		(1 << 7)

#define ISP1301_I2C_ADDR 0x2C

#define ISP1301_I2C_MODE_CONTROL_1 0x4
#define ISP1301_I2C_MODE_CONTROL_2 0x12
#define ISP1301_I2C_OTG_CONTROL_1 0x6
#define ISP1301_I2C_OTG_CONTROL_2 0x10
#define ISP1301_I2C_INTERRUPT_SOURCE 0x8
#define ISP1301_I2C_INTERRUPT_LATCH 0xA
#define ISP1301_I2C_INTERRUPT_FALLING 0xC
#define ISP1301_I2C_INTERRUPT_RISING 0xE
#define ISP1301_I2C_REG_CLEAR_ADDR 1

struct i2c_driver isp1301_driver;
struct i2c_client *isp1301_i2c_client;

extern int usb_disabled(void);
extern int ocpi_enable(void);

static struct clk *usb_clk;

static int isp1301_probe(struct i2c_adapter *adap);
static int isp1301_detach(struct i2c_client *client);

static const unsigned short normal_i2c[] =
    { ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
static const unsigned short dummy_i2c_addrlist[] = { I2C_CLIENT_END };

static struct i2c_client_address_data addr_data = {
	.normal_i2c = normal_i2c,
	.probe = dummy_i2c_addrlist,
	.ignore = dummy_i2c_addrlist,
};

struct i2c_driver isp1301_driver = {
	.driver = {
		.name = "isp1301_pnx",
	},
	.attach_adapter = isp1301_probe,
	.detach_client = isp1301_detach,
};

static int isp1301_attach(struct i2c_adapter *adap, int addr, int kind)
{
	struct i2c_client *c;
	int err;

	c = kzalloc(sizeof(*c), GFP_KERNEL);
	if (!c)
		return -ENOMEM;

	strlcpy(c->name, "isp1301_pnx", I2C_NAME_SIZE);
	c->flags = 0;
	c->addr = addr;
	c->adapter = adap;
	c->driver = &isp1301_driver;

	err = i2c_attach_client(c);
	if (err) {
		kfree(c);
		return err;
	}

	isp1301_i2c_client = c;

	return 0;
}

static int isp1301_probe(struct i2c_adapter *adap)
{
	return i2c_probe(adap, &addr_data, isp1301_attach);
}

static int isp1301_detach(struct i2c_client *client)
{
	i2c_detach_client(client);
	kfree(isp1301_i2c_client);
	return 0;
}

static void i2c_write(u8 buf, u8 subaddr)
{
	char tmpbuf[2];

	tmpbuf[0] = subaddr;	/*register number */
	tmpbuf[1] = buf;	/*register data */
	i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
}

static void isp1301_configure(void)
{
	/* PNX4008 only supports DAT_SE0 USB mode */
	/* PNX4008 R2A requires setting the MAX603 to output 3.6V */
	/* Power up externel charge-pump */

	i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
	i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
		  ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
	i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
		  ISP1301_I2C_MODE_CONTROL_2);
	i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
		  ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
	i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
		  ISP1301_I2C_OTG_CONTROL_1);
	i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
		  ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
	i2c_write(0xFF,
		  ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
	i2c_write(0xFF,
		  ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
	i2c_write(0xFF,
		  ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);

}

static inline void isp1301_vbus_on(void)
{
	i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
}

static inline void isp1301_vbus_off(void)
{
	i2c_write(OTG1_VBUS_DRV,
		  ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
}

static void pnx4008_start_hc(void)
{
	unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
	__raw_writel(tmp, USB_OTG_STAT_CONTROL);
	isp1301_vbus_on();
}

static void pnx4008_stop_hc(void)
{
	unsigned long tmp;
	isp1301_vbus_off();
	tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
	__raw_writel(tmp, USB_OTG_STAT_CONTROL);
}

static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
{
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	int ret;

	if ((ret = ohci_init(ohci)) < 0)
		return ret;

	if ((ret = ohci_run(ohci)) < 0) {
		dev_err(hcd->self.controller, "can't start\n");
		ohci_stop(hcd);
		return ret;
	}
	return 0;
}

static const struct hc_driver ohci_pnx4008_hc_driver = {
	.description = hcd_name,
	.product_desc =		"pnx4008 OHCI",

	/*
	 * generic hardware linkage
	 */
	.irq = ohci_irq,
	.flags = HCD_USB11 | HCD_MEMORY,

	.hcd_priv_size =	sizeof(struct ohci_hcd),
	/*
	 * basic lifecycle operations
	 */
	.start = ohci_pnx4008_start,
	.stop = ohci_stop,
	.shutdown = ohci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue = ohci_urb_enqueue,
	.urb_dequeue = ohci_urb_dequeue,
	.endpoint_disable = ohci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number = ohci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data = ohci_hub_status_data,
	.hub_control = ohci_hub_control,
	.hub_irq_enable = ohci_rhsc_enable,
#ifdef	CONFIG_PM
	.bus_suspend = ohci_bus_suspend,
	.bus_resume = ohci_bus_resume,
#endif
	.start_port_reset = ohci_start_port_reset,
};

#define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)

static void pnx4008_set_usb_bits(void)
{
	start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
	start_int_ack(SE_USB_OTG_ATX_INT_N);
	start_int_umask(SE_USB_OTG_ATX_INT_N);

	start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
	start_int_ack(SE_USB_OTG_TIMER_INT);
	start_int_umask(SE_USB_OTG_TIMER_INT);

	start_int_set_rising_edge(SE_USB_I2C_INT);
	start_int_ack(SE_USB_I2C_INT);
	start_int_umask(SE_USB_I2C_INT);

	start_int_set_rising_edge(SE_USB_INT);
	start_int_ack(SE_USB_INT);
	start_int_umask(SE_USB_INT);

	start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
	start_int_ack(SE_USB_NEED_CLK_INT);
	start_int_umask(SE_USB_NEED_CLK_INT);

	start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
	start_int_ack(SE_USB_AHB_NEED_CLK_INT);
	start_int_umask(SE_USB_AHB_NEED_CLK_INT);
}

static void pnx4008_unset_usb_bits(void)
{
	start_int_mask(SE_USB_OTG_ATX_INT_N);
	start_int_mask(SE_USB_OTG_TIMER_INT);
	start_int_mask(SE_USB_I2C_INT);
	start_int_mask(SE_USB_INT);
	start_int_mask(SE_USB_NEED_CLK_INT);
	start_int_mask(SE_USB_AHB_NEED_CLK_INT);
}

static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd = 0;
	struct ohci_hcd *ohci;
	const struct hc_driver *driver = &ohci_pnx4008_hc_driver;

	int ret = 0, irq;

	dev_dbg(&pdev->dev, "%s: " DRIVER_INFO " (pnx4008)\n", hcd_name);
	if (usb_disabled()) {
		err("USB is disabled");
		ret = -ENODEV;
		goto out;
	}

	if (pdev->num_resources != 2
	    || pdev->resource[0].flags != IORESOURCE_MEM
	    || pdev->resource[1].flags != IORESOURCE_IRQ) {
		err("Invalid resource configuration");
		ret = -ENODEV;
		goto out;
	}

	/* Enable AHB slave USB clock, needed for further USB clock control */
	__raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);

	ret = i2c_add_driver(&isp1301_driver);
	if (ret < 0) {
		err("failed to connect I2C to ISP1301 USB Transceiver");
		goto out;
	}

	isp1301_configure();

	/* Enable USB PLL */
	usb_clk = clk_get(&pdev->dev, "ck_pll5");
	if (IS_ERR(usb_clk)) {
		err("failed to acquire USB PLL");
		ret = PTR_ERR(usb_clk);
		goto out1;
	}

	ret = clk_enable(usb_clk);
	if (ret < 0) {
		err("failed to start USB PLL");
		goto out2;
	}

	ret = clk_set_rate(usb_clk, 48000);
	if (ret < 0) {
		err("failed to set USB clock rate");
		goto out3;
	}

	__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);

	/* Set to enable all needed USB clocks */
	__raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);

	while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
	       USB_CLOCK_MASK) ;

	hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		err("Failed to allocate HC buffer");
		ret = -ENOMEM;
		goto out3;
	}

	/* Set all USB bits in the Start Enable register */
	pnx4008_set_usb_bits();

	hcd->rsrc_start = pdev->resource[0].start;
	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		dev_dbg(&pdev->dev, "request_mem_region failed\n");
		ret =  -ENOMEM;
		goto out4;
	}
	hcd->regs = (void __iomem *)pdev->resource[0].start;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		ret = -ENXIO;
		goto out4;
	}

	pnx4008_start_hc();
	platform_set_drvdata(pdev, hcd);
	ohci = hcd_to_ohci(hcd);
	ohci_hcd_init(ohci);

	dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
	if (ret == 0)
		return ret;

	pnx4008_stop_hc();
out4:
	pnx4008_unset_usb_bits();
	usb_put_hcd(hcd);
out3:
	clk_disable(usb_clk);
out2:
	clk_put(usb_clk);
out1:
	i2c_del_driver(&isp1301_driver);
out:
	return ret;
}

static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_remove_hcd(hcd);
	pnx4008_stop_hc();
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	pnx4008_unset_usb_bits();
	clk_disable(usb_clk);
	clk_put(usb_clk);
	i2c_del_driver(&isp1301_driver);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:usb-ohci");

static struct platform_driver usb_hcd_pnx4008_driver = {
	.driver = {
		.name = "usb-ohci",
		.owner	= THIS_MODULE,
	},
	.probe = usb_hcd_pnx4008_probe,
	.remove = usb_hcd_pnx4008_remove,
};