aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/usb-tusb6010.c
blob: 64a0112b70a5f0657db5911cad920ff488e47f8e (plain) (blame)
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
/*
 * linux/arch/arm/mach-omap2/usb-tusb6010.c
 *
 * Copyright (C) 2006 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>

#include <linux/usb/musb.h>

#include <plat/gpmc.h>

#include "mux.h"

static u8		async_cs, sync_cs;
static unsigned		refclk_psec;


/* t2_ps, when quantized to fclk units, must happen no earlier than
 * the clock after after t1_NS.
 *
 * Return a possibly updated value of t2_ps, converted to nsec.
 */
static unsigned
next_clk(unsigned t1_NS, unsigned t2_ps, unsigned fclk_ps)
{
	unsigned	t1_ps = t1_NS * 1000;
	unsigned	t1_f, t2_f;

	if ((t1_ps + fclk_ps) < t2_ps)
		return t2_ps / 1000;

	t1_f = (t1_ps + fclk_ps - 1) / fclk_ps;
	t2_f = (t2_ps + fclk_ps - 1) / fclk_ps;

	if (t1_f >= t2_f)
		t2_f = t1_f + 1;

	return (t2_f * fclk_ps) / 1000;
}

/* NOTE:  timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */

static int tusb_set_async_mode(unsigned sysclk_ps, unsigned fclk_ps)
{
	struct gpmc_timings	t;
	unsigned		t_acsnh_advnh = sysclk_ps + 3000;
	unsigned		tmp;

	memset(&t, 0, sizeof(t));

	/* CS_ON = t_acsnh_acsnl */
	t.cs_on = 8;
	/* ADV_ON = t_acsnh_advnh - t_advn */
	t.adv_on = next_clk(t.cs_on, t_acsnh_advnh - 7000, fclk_ps);

	/*
	 * READ ... from omap2420 TRM fig 12-13
	 */

	/* ADV_RD_OFF = t_acsnh_advnh */
	t.adv_rd_off = next_clk(t.adv_on, t_acsnh_advnh, fclk_ps);

	/* OE_ON = t_acsnh_advnh + t_advn_oen (then wait for nRDY) */
	t.oe_on = next_clk(t.adv_on, t_acsnh_advnh + 1000, fclk_ps);

	/* ACCESS = counters continue only after nRDY */
	tmp = t.oe_on * 1000 + 300;
	t.access = next_clk(t.oe_on, tmp, fclk_ps);

	/* OE_OFF = after data gets sampled */
	tmp = t.access * 1000;
	t.oe_off = next_clk(t.access, tmp, fclk_ps);

	t.cs_rd_off = t.oe_off;

	tmp = t.cs_rd_off * 1000 + 7000 /* t_acsn_rdy_z */;
	t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

	/*
	 * WRITE ... from omap2420 TRM fig 12-15
	 */

	/* ADV_WR_OFF = t_acsnh_advnh */
	t.adv_wr_off = t.adv_rd_off;

	/* WE_ON = t_acsnh_advnh + t_advn_wen (then wait for nRDY) */
	t.we_on = next_clk(t.adv_wr_off, t_acsnh_advnh + 1000, fclk_ps);

	/* WE_OFF = after data gets sampled */
	tmp = t.we_on * 1000 + 300;
	t.we_off = next_clk(t.we_on, tmp, fclk_ps);

	t.cs_wr_off = t.we_off;

	tmp = t.cs_wr_off * 1000 + 7000 /* t_acsn_rdy_z */;
	t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

	return gpmc_cs_set_timings(async_cs, &t);
}

static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
{
	struct gpmc_timings	t;
	unsigned		t_scsnh_advnh = sysclk_ps + 3000;
	unsigned		tmp;

	memset(&t, 0, sizeof(t));
	t.cs_on = 8;

	/* ADV_ON = t_acsnh_advnh - t_advn */
	t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);

	/* GPMC_CLK rate = fclk rate / div */
	t.sync_clk = 12 /* 11.1 nsec */;
	tmp = (t.sync_clk * 1000 + fclk_ps - 1) / fclk_ps;
	if (tmp > 4)
		return -ERANGE;
	if (tmp <= 0)
		tmp = 1;
	t.page_burst_access = (fclk_ps * tmp) / 1000;

	/*
	 * READ ... based on omap2420 TRM fig 12-19, 12-20
	 */

	/* ADV_RD_OFF = t_scsnh_advnh */
	t.adv_rd_off = next_clk(t.adv_on, t_scsnh_advnh, fclk_ps);

	/* OE_ON = t_scsnh_advnh + t_advn_oen * fclk_ps (then wait for nRDY) */
	tmp = (t.adv_rd_off * 1000) + (3 * fclk_ps);
	t.oe_on = next_clk(t.adv_on, tmp, fclk_ps);

	/* ACCESS = number of clock cycles after t_adv_eon */
	tmp = (t.oe_on * 1000) + (5 * fclk_ps);
	t.access = next_clk(t.oe_on, tmp, fclk_ps);

	/* OE_OFF = after data gets sampled */
	tmp = (t.access * 1000) + (1 * fclk_ps);
	t.oe_off = next_clk(t.access, tmp, fclk_ps);

	t.cs_rd_off = t.oe_off;

	tmp = t.cs_rd_off * 1000 + 7000 /* t_scsn_rdy_z */;
	t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);

	/*
	 * WRITE ... based on omap2420 TRM fig 12-21
	 */

	/* ADV_WR_OFF = t_scsnh_advnh */
	t.adv_wr_off = t.adv_rd_off;

	/* WE_ON = t_scsnh_advnh + t_advn_wen * fclk_ps (then wait for nRDY) */
	tmp = (t.adv_wr_off * 1000) + (3 * fclk_ps);
	t.we_on = next_clk(t.adv_wr_off, tmp, fclk_ps);

	/* WE_OFF = number of clock cycles after t_adv_wen */
	tmp = (t.we_on * 1000) + (6 * fclk_ps);
	t.we_off = next_clk(t.we_on, tmp, fclk_ps);

	t.cs_wr_off = t.we_off;

	tmp = t.cs_wr_off * 1000 + 7000 /* t_scsn_rdy_z */;
	t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);

	return gpmc_cs_set_timings(sync_cs, &t);
}

extern unsigned long gpmc_get_fclk_period(void);

/* tusb driver calls this when it changes the chip's clocking */
int tusb6010_platform_retime(unsigned is_refclk)
{
	static const char	error[] =
		KERN_ERR "tusb6010 %s retime error %d\n";

	unsigned	fclk_ps = gpmc_get_fclk_period();
	unsigned	sysclk_ps;
	int		status;

	if (!refclk_psec || fclk_ps == 0)
		return -ENODEV;

	sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;

	status = tusb_set_async_mode(sysclk_ps, fclk_ps);
	if (status < 0) {
		printk(error, "async", status);
		goto done;
	}
	status = tusb_set_sync_mode(sysclk_ps, fclk_ps);
	if (status < 0)
		printk(error, "sync", status);
done:
	return status;
}
EXPORT_SYMBOL_GPL(tusb6010_platform_retime);

static struct resource tusb_resources[] = {
	/* Order is significant!  The start/end fields
	 * are updated during setup..
	 */
	{ /* Asynchronous access */
		.flags	= IORESOURCE_MEM,
	},
	{ /* Synchronous access */
		.flags	= IORESOURCE_MEM,
	},
	{ /* IRQ */
		.flags	= IORESOURCE_IRQ,
	},
};

static u64 tusb_dmamask = ~(u32)0;

static struct platform_device tusb_device = {
	.name		= "musb_hdrc",
	.id		= -1,
	.dev = {
		.dma_mask		= &tusb_dmamask,
		.coherent_dma_mask	= 0xffffffff,
	},
	.num_resources	= ARRAY_SIZE(tusb_resources),
	.resource	= tusb_resources,
};


/* this may be called only from board-*.c setup code */
int __init
tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
		unsigned ps_refclk, unsigned waitpin,
		unsigned async, unsigned sync,
		unsigned irq, unsigned dmachan)
{
	int		status;
	static char	error[] __initdata =
		KERN_ERR "tusb6010 init error %d, %d\n";

	/* ASYNC region, primarily for PIO */
	status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
				&tusb_resources[0].start);
	if (status < 0) {
		printk(error, 1, status);
		return status;
	}
	tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
	async_cs = async;
	gpmc_cs_write_reg(async, GPMC_CS_CONFIG1,
			  GPMC_CONFIG1_PAGE_LEN(2)
			| GPMC_CONFIG1_WAIT_READ_MON
			| GPMC_CONFIG1_WAIT_WRITE_MON
			| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
			| GPMC_CONFIG1_READTYPE_ASYNC
			| GPMC_CONFIG1_WRITETYPE_ASYNC
			| GPMC_CONFIG1_DEVICESIZE_16
			| GPMC_CONFIG1_DEVICETYPE_NOR
			| GPMC_CONFIG1_MUXADDDATA);


	/* SYNC region, primarily for DMA */
	status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
				&tusb_resources[1].start);
	if (status < 0) {
		printk(error, 2, status);
		return status;
	}
	tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
	sync_cs = sync;
	gpmc_cs_write_reg(sync, GPMC_CS_CONFIG1,
			  GPMC_CONFIG1_READMULTIPLE_SUPP
			| GPMC_CONFIG1_READTYPE_SYNC
			| GPMC_CONFIG1_WRITEMULTIPLE_SUPP
			| GPMC_CONFIG1_WRITETYPE_SYNC
			| GPMC_CONFIG1_CLKACTIVATIONTIME(1)
			| GPMC_CONFIG1_PAGE_LEN(2)
			| GPMC_CONFIG1_WAIT_READ_MON
			| GPMC_CONFIG1_WAIT_WRITE_MON
			| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
			| GPMC_CONFIG1_DEVICESIZE_16
			| GPMC_CONFIG1_DEVICETYPE_NOR
			| GPMC_CONFIG1_MUXADDDATA
			/* fclk divider gets set later */
			);

	/* IRQ */
	status = gpio_request(irq, "TUSB6010 irq");
	if (status < 0) {
		printk(error, 3, status);
		return status;
	}
	gpio_direction_input(irq);
	tusb_resources[2].start = irq + IH_GPIO_BASE;

	/* set up memory timings ... can speed them up later */
	if (!ps_refclk) {
		printk(error, 4, status);
		return -ENODEV;
	}
	refclk_psec = ps_refclk;
	status = tusb6010_platform_retime(1);
	if (status < 0) {
		printk(error, 5, status);
		return status;
	}

	/* finish device setup ... */
	if (!data) {
		printk(error, 6, status);
		return -ENODEV;
	}
	tusb_device.dev.platform_data = data;

	/* REVISIT let the driver know what DMA channels work */
	if (!dmachan)
		tusb_device.dev.dma_mask = NULL;
	else {
		/* assume OMAP 2420 ES2.0 and later */
		if (dmachan & (1 << 0))
			omap_mux_init_signal("sys_ndmareq0", 0);
		if (dmachan & (1 << 1))
			omap_mux_init_signal("sys_ndmareq1", 0);
		if (dmachan & (1 << 2))
			omap_mux_init_signal("sys_ndmareq2", 0);
		if (dmachan & (1 << 3))
			omap_mux_init_signal("sys_ndmareq3", 0);
		if (dmachan & (1 << 4))
			omap_mux_init_signal("sys_ndmareq4", 0);
		if (dmachan & (1 << 5))
			omap_mux_init_signal("sys_ndmareq5", 0);
	}

	/* so far so good ... register the device */
	status = platform_device_register(&tusb_device);
	if (status < 0) {
		printk(error, 7, status);
		return status;
	}
	return 0;
}