aboutsummaryrefslogtreecommitdiff
path: root/cpu/mcf5445x/speed.c
blob: 9c0c07733b50bfd09cd4fc591d1c92862072a386 (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
/*
 *
 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/processor.h>

#include <asm/immap.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Low Power Divider specifications
 */
#define CLOCK_LPD_MIN		(1 << 0)	/* Divider (decoded) */
#define CLOCK_LPD_MAX		(1 << 15)	/* Divider (decoded) */

#define CLOCK_PLL_FVCO_MAX	540000000
#define CLOCK_PLL_FVCO_MIN	300000000

#define CLOCK_PLL_FSYS_MAX	266666666
#define CLOCK_PLL_FSYS_MIN	100000000
#define MHZ			1000000

void clock_enter_limp(int lpdiv)
{
	volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
	int i, j;

	/* Check bounds of divider */
	if (lpdiv < CLOCK_LPD_MIN)
		lpdiv = CLOCK_LPD_MIN;
	if (lpdiv > CLOCK_LPD_MAX)
		lpdiv = CLOCK_LPD_MAX;

	/* Round divider down to nearest power of two */
	for (i = 0, j = lpdiv; j != 1; j >>= 1, i++) ;

	/* Apply the divider to the system clock */
	ccm->cdr = (ccm->cdr & 0xF0FF) | CCM_CDR_LPDIV(i);

	/* Enable Limp Mode */
	ccm->misccr |= CCM_MISCCR_LIMP;
}

/*
 * brief   Exit Limp mode
 * warning The PLL should be set and locked prior to exiting Limp mode
 */
void clock_exit_limp(void)
{
	volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
	volatile pll_t *pll = (volatile pll_t *)MMAP_PLL;

	/* Exit Limp mode */
	ccm->misccr &= ~CCM_MISCCR_LIMP;

	/* Wait for the PLL to lock */
	while (!(pll->psr & PLL_PSR_LOCK)) ;
}

/*
 * get_clocks() fills in gd->cpu_clock and gd->bus_clk
 */
int get_clocks(void)
{

	volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
	volatile pll_t *pll = (volatile pll_t *)MMAP_PLL;
	int pllmult_nopci[] = { 20, 10, 24, 18, 12, 6, 16, 8 };
	int pllmult_pci[] = { 12, 6, 16, 8 };
	int vco = 0, bPci, temp, fbtemp, pcrvalue;
	int *pPllmult = NULL;
	u16 fbpll_mask;

#ifdef CONFIG_M54455EVB
	volatile u8 *cpld = (volatile u8 *)(CONFIG_SYS_CS2_BASE + 3);
#endif
	u8 bootmode;

	/* To determine PCI is present or not */
	if (((ccm->ccr & CCM_CCR_360_FBCONFIG_MASK) == 0x00e0) ||
	    ((ccm->ccr & CCM_CCR_360_FBCONFIG_MASK) == 0x0060)) {
		pPllmult = &pllmult_pci[0];
		fbpll_mask = 3;		/* 11b */
		bPci = 1;
	} else {
		pPllmult = &pllmult_nopci[0];
		fbpll_mask = 7;		/* 111b */
#ifdef CONFIG_PCI
		gd->pci_clk = 0;
#endif
		bPci = 0;
	}

#ifdef CONFIG_M54455EVB
	bootmode = (*cpld & 0x03);

	if (bootmode != 3) {
		/* Temporary read from CCR- fixed fb issue, must be the same clock
		   as pci or input clock, causing cpld/fpga read inconsistancy */
		fbtemp = pPllmult[ccm->ccr & fbpll_mask];

		/* Break down into small pieces, code still in flex bus */
		pcrvalue = pll->pcr & 0xFFFFF0FF;
		temp = fbtemp - 1;
		pcrvalue |= PLL_PCR_OUTDIV3(temp);

		pll->pcr = pcrvalue;
	}
#endif
#ifdef CONFIG_M54451EVB
	/* No external logic to read the bootmode, hard coded from built */
#ifdef CONFIG_CF_SBF
	bootmode = 3;
#else
	bootmode = 2;

	/* default value is 16 mul, set to 20 mul */
	pcrvalue = (pll->pcr & 0x00FFFFFF) | 0x14000000;
	pll->pcr = pcrvalue;
	while ((pll->psr & PLL_PSR_LOCK) != PLL_PSR_LOCK);
#endif
#endif

	if (bootmode == 0) {
		/* RCON mode */
		vco = pPllmult[ccm->rcon & fbpll_mask] * CONFIG_SYS_INPUT_CLKSRC;

		if ((vco < CLOCK_PLL_FVCO_MIN) || (vco > CLOCK_PLL_FVCO_MAX)) {
			/* invaild range, re-set in PCR */
			int temp = ((pll->pcr & PLL_PCR_OUTDIV2_MASK) >> 4) + 1;
			int i, j, bus;

			j = (pll->pcr & 0xFF000000) >> 24;
			for (i = j; i < 0xFF; i++) {
				vco = i * CONFIG_SYS_INPUT_CLKSRC;
				if (vco >= CLOCK_PLL_FVCO_MIN) {
					bus = vco / temp;
					if (bus <= CLOCK_PLL_FSYS_MIN - MHZ)
						continue;
					else
						break;
				}
			}
			pcrvalue = pll->pcr & 0x00FF00FF;
			fbtemp = ((i - 1) << 8) | ((i - 1) << 12);
			pcrvalue |= ((i << 24) | fbtemp);

			pll->pcr = pcrvalue;
		}
		gd->vco_clk = vco;	/* Vco clock */
	} else if (bootmode == 2) {
		/* Normal mode */
		vco =  ((pll->pcr & 0xFF000000) >> 24) * CONFIG_SYS_INPUT_CLKSRC;
		if ((vco < CLOCK_PLL_FVCO_MIN) || (vco > CLOCK_PLL_FVCO_MAX)) {
			/* Default value */
			pcrvalue = (pll->pcr & 0x00FFFFFF);
			pcrvalue |= pPllmult[ccm->ccr & fbpll_mask] << 24;
			pll->pcr = pcrvalue;
			vco =  ((pll->pcr & 0xFF000000) >> 24) * CONFIG_SYS_INPUT_CLKSRC;
		}
		gd->vco_clk = vco;	/* Vco clock */
	} else if (bootmode == 3) {
		/* serial mode */
		vco =  ((pll->pcr & 0xFF000000) >> 24) * CONFIG_SYS_INPUT_CLKSRC;
		gd->vco_clk = vco;	/* Vco clock */
	}

	if ((ccm->ccr & CCM_MISCCR_LIMP) == CCM_MISCCR_LIMP) {
		/* Limp mode */
	} else {
		gd->inp_clk = CONFIG_SYS_INPUT_CLKSRC;	/* Input clock */

		temp = (pll->pcr & PLL_PCR_OUTDIV1_MASK) + 1;
		gd->cpu_clk = vco / temp;	/* cpu clock */

		temp = ((pll->pcr & PLL_PCR_OUTDIV2_MASK) >> 4) + 1;
		gd->bus_clk = vco / temp;	/* bus clock */

		temp = ((pll->pcr & PLL_PCR_OUTDIV3_MASK) >> 8) + 1;
		gd->flb_clk = vco / temp;	/* FlexBus clock */

#ifdef CONFIG_PCI
		if (bPci) {
			temp = ((pll->pcr & PLL_PCR_OUTDIV4_MASK) >> 12) + 1;
			gd->pci_clk = vco / temp;	/* PCI clock */
		}
#endif
	}

#ifdef CONFIG_FSL_I2C
	gd->i2c1_clk = gd->bus_clk;
#endif

	return (0);
}