summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/clock34xx.c
blob: ded32364f32b0cfe270873252a4e4702409ed828 (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
/*
 * OMAP3-specific clock framework functions
 *
 * Copyright (C) 2007-2008 Texas Instruments, Inc.
 * Copyright (C) 2007-2009 Nokia Corporation
 *
 * Written by Paul Walmsley
 * Testing and integration fixes by Jouni Högander
 *
 * Parts of this code are based on code written by
 * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
 *
 * 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.
 */
#undef DEBUG

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/limits.h>
#include <linux/bitops.h>

#include <plat/cpu.h>
#include <plat/clock.h>
#include <plat/sram.h>
#include <plat/sdrc.h>
#include <asm/div64.h>
#include <asm/clkdev.h>

#include <plat/sdrc.h>
#include "clock.h"
#include "clock34xx.h"
#include "sdrc.h"
#include "prm.h"
#include "prm-regbits-34xx.h"
#include "cm.h"
#include "cm-regbits-34xx.h"

#define CYCLES_PER_MHZ			1000000

/*
 * DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks
 * that are sourced by DPLL5, and both of these require this clock
 * to be at 120 MHz for proper operation.
 */
#define DPLL5_FREQ_FOR_USBHOST		120000000

/* needed by omap3_core_dpll_m2_set_rate() */
struct clk *sdrc_ick_p, *arm_fck_p;

/**
 * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 *
 * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
 * from the CM_{I,F}CLKEN bit.  Pass back the correct info via
 * @idlest_reg and @idlest_bit.  No return value.
 */
static void omap3430es2_clk_ssi_find_idlest(struct clk *clk,
					    void __iomem **idlest_reg,
					    u8 *idlest_bit)
{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
	*idlest_reg = (__force void __iomem *)r;
	*idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
}

const struct clkops clkops_omap3430es2_ssi_wait = {
	.enable		= omap2_dflt_clk_enable,
	.disable	= omap2_dflt_clk_disable,
	.find_idlest	= omap3430es2_clk_ssi_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
};

/**
 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 *
 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
 * target IDLEST bits.  For our purposes, we are concerned with the
 * target IDLEST bits, which exist at a different bit position than
 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
 * default find_idlest code assumes that they are at the same
 * position.)  No return value.
 */
static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk *clk,
						    void __iomem **idlest_reg,
						    u8 *idlest_bit)
{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
	*idlest_reg = (__force void __iomem *)r;
	/* USBHOST_IDLE has same shift */
	*idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
}

const struct clkops clkops_omap3430es2_dss_usbhost_wait = {
	.enable		= omap2_dflt_clk_enable,
	.disable	= omap2_dflt_clk_disable,
	.find_idlest	= omap3430es2_clk_dss_usbhost_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
};

/**
 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 *
 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
 * shift from the CM_{I,F}CLKEN bit.  Pass back the correct info via
 * @idlest_reg and @idlest_bit.  No return value.
 */
static void omap3430es2_clk_hsotgusb_find_idlest(struct clk *clk,
						 void __iomem **idlest_reg,
						 u8 *idlest_bit)
{
	u32 r;

	r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
	*idlest_reg = (__force void __iomem *)r;
	*idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
}

const struct clkops clkops_omap3430es2_hsotgusb_wait = {
	.enable		= omap2_dflt_clk_enable,
	.disable	= omap2_dflt_clk_disable,
	.find_idlest	= omap3430es2_clk_hsotgusb_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
};

const struct clkops clkops_noncore_dpll_ops = {
	.enable		= omap3_noncore_dpll_enable,
	.disable	= omap3_noncore_dpll_disable,
};

int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
{
	/*
	 * According to the 12-5 CDP code from TI, "Limitation 2.5"
	 * on 3430ES1 prevents us from changing DPLL multipliers or dividers
	 * on DPLL4.
	 */
	if (omap_rev() == OMAP3430_REV_ES1_0) {
		printk(KERN_ERR "clock: DPLL4 cannot change rate due to "
		       "silicon 'Limitation 2.5' on 3430ES1.\n");
		return -EINVAL;
	}
	return omap3_noncore_dpll_set_rate(clk, rate);
}


/*
 * CORE DPLL (DPLL3) rate programming functions
 *
 * These call into SRAM code to do the actual CM writes, since the SDRAM
 * is clocked from DPLL3.
 */

/**
 * omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider
 * @clk: struct clk * of DPLL to set
 * @rate: rounded target rate
 *
 * Program the DPLL M2 divider with the rounded target rate.  Returns
 * -EINVAL upon error, or 0 upon success.
 */
int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
{
	u32 new_div = 0;
	u32 unlock_dll = 0;
	u32 c;
	unsigned long validrate, sdrcrate, _mpurate;
	struct omap_sdrc_params *sdrc_cs0;
	struct omap_sdrc_params *sdrc_cs1;
	int ret;

	if (!clk || !rate)
		return -EINVAL;

	validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
	if (validrate != rate)
		return -EINVAL;

	sdrcrate = sdrc_ick_p->rate;
	if (rate > clk->rate)
		sdrcrate <<= ((rate / clk->rate) >> 1);
	else
		sdrcrate >>= ((clk->rate / rate) >> 1);

	ret = omap2_sdrc_get_params(sdrcrate, &sdrc_cs0, &sdrc_cs1);
	if (ret)
		return -EINVAL;

	if (sdrcrate < MIN_SDRC_DLL_LOCK_FREQ) {
		pr_debug("clock: will unlock SDRC DLL\n");
		unlock_dll = 1;
	}

	/*
	 * XXX This only needs to be done when the CPU frequency changes
	 */
	_mpurate = arm_fck_p->rate / CYCLES_PER_MHZ;
	c = (_mpurate << SDRC_MPURATE_SCALE) >> SDRC_MPURATE_BASE_SHIFT;
	c += 1;  /* for safety */
	c *= SDRC_MPURATE_LOOPS;
	c >>= SDRC_MPURATE_SCALE;
	if (c == 0)
		c = 1;

	pr_debug("clock: changing CORE DPLL rate from %lu to %lu\n", clk->rate,
		 validrate);
	pr_debug("clock: SDRC CS0 timing params used:"
		 " RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
		 sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
		 sdrc_cs0->actim_ctrlb, sdrc_cs0->mr);
	if (sdrc_cs1)
		pr_debug("clock: SDRC CS1 timing params used: "
		 " RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
		 sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
		 sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);

	if (sdrc_cs1)
		omap3_configure_core_dpll(
				  new_div, unlock_dll, c, rate > clk->rate,
				  sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
				  sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
				  sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
				  sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);
	else
		omap3_configure_core_dpll(
				  new_div, unlock_dll, c, rate > clk->rate,
				  sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
				  sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
				  0, 0, 0, 0);

	return 0;
}

/* Common clock code */

/*
 * As it is structured now, this will prevent an OMAP2/3 multiboot
 * kernel from compiling.  This will need further attention.
 */
#if defined(CONFIG_ARCH_OMAP3)

struct clk_functions omap2_clk_functions = {
	.clk_enable		= omap2_clk_enable,
	.clk_disable		= omap2_clk_disable,
	.clk_round_rate		= omap2_clk_round_rate,
	.clk_set_rate		= omap2_clk_set_rate,
	.clk_set_parent		= omap2_clk_set_parent,
	.clk_disable_unused	= omap2_clk_disable_unused,
};

/*
 * Set clocks for bypass mode for reboot to work.
 */
void omap2_clk_prepare_for_reboot(void)
{
	/* REVISIT: Not ready for 343x */
#if 0
	u32 rate;

	if (vclk == NULL || sclk == NULL)
		return;

	rate = clk_get_rate(sclk);
	clk_set_rate(vclk, rate);
#endif
}

void omap3_clk_lock_dpll5(void)
{
	struct clk *dpll5_clk;
	struct clk *dpll5_m2_clk;

	dpll5_clk = clk_get(NULL, "dpll5_ck");
	clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST);
	clk_enable(dpll5_clk);

	/* Enable autoidle to allow it to enter low power bypass */
	omap3_dpll_allow_idle(dpll5_clk);

	/* Program dpll5_m2_clk divider for no division */
	dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck");
	clk_enable(dpll5_m2_clk);
	clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST);

	clk_disable(dpll5_m2_clk);
	clk_disable(dpll5_clk);
	return;
}

/* REVISIT: Move this init stuff out into clock.c */

/*
 * Switch the MPU rate if specified on cmdline.
 * We cannot do this early until cmdline is parsed.
 */
static int __init omap2_clk_arch_init(void)
{
	struct clk *osc_sys_ck, *dpll1_ck, *arm_fck, *core_ck;
	unsigned long osc_sys_rate;

	if (!mpurate)
		return -EINVAL;

	/* XXX test these for success */
	dpll1_ck = clk_get(NULL, "dpll1_ck");
	arm_fck = clk_get(NULL, "arm_fck");
	core_ck = clk_get(NULL, "core_ck");
	osc_sys_ck = clk_get(NULL, "osc_sys_ck");

	/* REVISIT: not yet ready for 343x */
	if (clk_set_rate(dpll1_ck, mpurate))
		printk(KERN_ERR "*** Unable to set MPU rate\n");

	recalculate_root_clocks();

	osc_sys_rate = clk_get_rate(osc_sys_ck);

	pr_info("Switched to new clocking rate (Crystal/Core/MPU): "
		"%ld.%01ld/%ld/%ld MHz\n",
		(osc_sys_rate / 1000000),
		((osc_sys_rate / 100000) % 10),
		(clk_get_rate(core_ck) / 1000000),
		(clk_get_rate(arm_fck) / 1000000));

	calibrate_delay();

	return 0;
}
arch_initcall(omap2_clk_arch_init);


#endif