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
|
/*
* (C) Copyright 2007
* Sascha Hauer, Pengutronix
*
* (C) Copyright 2009-2010 Freescale Semiconductor
*
* 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/errno.h>
#include <asm/arch/mx25-regs.h>
static u32 mx25_decode_pll(u32 reg)
{
u32 mfi = (reg >> 10) & 0xf;
u32 mfn = reg & 0x3ff;
u32 mfd = (reg >> 16) & 0x3ff;
u32 pd = (reg >> 26) & 0xf;
u32 ref_clk = PLL_REF_CLK;
mfi = mfi <= 5 ? 5 : mfi;
mfd += 1;
pd += 1;
return ((2 * (ref_clk >> 10) * (mfi * mfd + mfn)) /
(mfd * pd)) << 10;
}
static u32 mx25_get_mcu_main_clk(void)
{
u32 cctl = __REG(CCM_CCTL);
u32 ret_val = mx25_decode_pll(__REG(CCM_MPCTL));
if (cctl & CRM_CCTL_ARM_SRC) {
ret_val *= 3;
ret_val /= 4;
}
return ret_val;
}
static u32 mx25_get_ahb_clk(void)
{
u32 cctl = __REG(CCM_CCTL);
u32 ahb_div = ((cctl >> CRM_CCTL_AHB_OFFSET) & 3) + 1;
return mx25_get_mcu_main_clk()/ahb_div;
}
unsigned int mx25_get_ipg_clk(void)
{
return mx25_get_ahb_clk()/2;
}
unsigned int mx25_get_cspi_clk(void)
{
return mx25_get_ipg_clk();
}
void mx25_dump_clocks(void)
{
u32 cpufreq = mx25_get_mcu_main_clk();
printf("mx25 cpu clock: %dMHz\n", cpufreq / 1000000);
printf("ipg clock : %dHz\n", mx25_get_ipg_clk());
}
unsigned int mxc_get_clock(enum mxc_clock clk)
{
switch (clk) {
case MXC_ARM_CLK:
return mx25_get_mcu_main_clk();
case MXC_AHB_CLK:
return mx25_get_ahb_clk();
break;
case MXC_IPG_PERCLK:
case MXC_IPG_CLK:
return mx25_get_ipg_clk();
case MXC_CSPI_CLK:
return mx25_get_cspi_clk();
case MXC_UART_CLK:
break;
case MXC_ESDHC_CLK:
return mx25_get_ipg_clk();
break;
}
return -1;
}
#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo(void)
{
printf("CPU: Freescale i.MX25 at %d MHz\n",
mx25_get_mcu_main_clk() / 1000000);
mx25_dump_clocks();
return 0;
}
#endif
#if defined(CONFIG_MXC_FEC)
extern int mxc_fec_initialize(bd_t *bis);
extern void mxc_fec_set_mac_from_env(char *mac_addr);
#endif
/*
* Initializes on-chip ethernet controllers.
* to override, implement board_eth_init()
*/
int cpu_eth_init(bd_t *bis)
{
int rc = -ENODEV;
#if defined(CONFIG_MXC_FEC)
rc = mxc_fec_initialize(bis);
#endif
return rc;
}
|
