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debb7354 JL |
1 | /* |
2 | * Copyright 2004 Freescale Semiconductor. | |
c934f655 | 3 | * Jeff Brown |
debb7354 JL |
4 | * Srikanth Srinivasan (srikanth.srinivasan@freescale.com) |
5 | * | |
6 | * (C) Copyright 2000-2002 | |
7 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
8 | * | |
3765b3e7 | 9 | * SPDX-License-Identifier: GPL-2.0+ |
debb7354 JL |
10 | */ |
11 | ||
12 | #include <common.h> | |
13 | #include <mpc86xx.h> | |
14 | #include <asm/processor.h> | |
ada591d2 | 15 | #include <asm/io.h> |
debb7354 | 16 | |
1218abf1 | 17 | DECLARE_GLOBAL_DATA_PTR; |
debb7354 | 18 | |
409ecdc0 WD |
19 | /* used in some defintiions of CONFIG_SYS_CLK_FREQ */ |
20 | extern unsigned long get_board_sys_clk(unsigned long dummy); | |
21 | ||
997399fa | 22 | void get_sys_info(sys_info_t *sys_info) |
debb7354 | 23 | { |
6d0f6bcf | 24 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; |
debb7354 JL |
25 | volatile ccsr_gur_t *gur = &immap->im_gur; |
26 | uint plat_ratio, e600_ratio; | |
ada591d2 | 27 | uint lcrr_div; |
debb7354 | 28 | |
c934f655 | 29 | plat_ratio = (gur->porpllsr) & 0x0000003e; |
debb7354 | 30 | plat_ratio >>= 1; |
5c9efb36 | 31 | |
ffff3ae5 | 32 | switch (plat_ratio) { |
c934f655 | 33 | case 0x0: |
997399fa | 34 | sys_info->freq_systembus = 16 * CONFIG_SYS_CLK_FREQ; |
debb7354 JL |
35 | break; |
36 | case 0x02: | |
37 | case 0x03: | |
38 | case 0x04: | |
39 | case 0x05: | |
40 | case 0x06: | |
41 | case 0x08: | |
42 | case 0x09: | |
43 | case 0x0a: | |
44 | case 0x0c: | |
c934f655 | 45 | case 0x10: |
997399fa | 46 | sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ; |
c934f655 | 47 | break; |
debb7354 | 48 | default: |
997399fa | 49 | sys_info->freq_systembus = 0; |
debb7354 JL |
50 | break; |
51 | } | |
52 | ||
debb7354 JL |
53 | e600_ratio = (gur->porpllsr) & 0x003f0000; |
54 | e600_ratio >>= 16; | |
5c9efb36 JL |
55 | |
56 | switch (e600_ratio) { | |
debb7354 | 57 | case 0x10: |
997399fa | 58 | sys_info->freq_processor = 2 * sys_info->freq_systembus; |
debb7354 | 59 | break; |
c934f655 | 60 | case 0x19: |
997399fa | 61 | sys_info->freq_processor = 5 * sys_info->freq_systembus / 2; |
debb7354 JL |
62 | break; |
63 | case 0x20: | |
997399fa | 64 | sys_info->freq_processor = 3 * sys_info->freq_systembus; |
debb7354 | 65 | break; |
c934f655 | 66 | case 0x39: |
997399fa | 67 | sys_info->freq_processor = 7 * sys_info->freq_systembus / 2; |
debb7354 JL |
68 | break; |
69 | case 0x28: | |
997399fa | 70 | sys_info->freq_processor = 4 * sys_info->freq_systembus; |
debb7354 JL |
71 | break; |
72 | case 0x1d: | |
997399fa | 73 | sys_info->freq_processor = 9 * sys_info->freq_systembus / 2; |
debb7354 | 74 | break; |
c934f655 | 75 | default: |
997399fa PK |
76 | sys_info->freq_processor = e600_ratio + |
77 | sys_info->freq_systembus; | |
debb7354 JL |
78 | break; |
79 | } | |
ada591d2 TP |
80 | |
81 | #if defined(CONFIG_SYS_LBC_LCRR) | |
82 | /* We will program LCRR to this value later */ | |
83 | lcrr_div = CONFIG_SYS_LBC_LCRR & LCRR_CLKDIV; | |
84 | #else | |
f51cdaf1 | 85 | lcrr_div = in_be32(&immap->im_lbc.lcrr) & LCRR_CLKDIV; |
ada591d2 TP |
86 | #endif |
87 | if (lcrr_div == 2 || lcrr_div == 4 || lcrr_div == 8) { | |
997399fa PK |
88 | sys_info->freq_localbus = sys_info->freq_systembus |
89 | / (lcrr_div * 2); | |
ada591d2 TP |
90 | } else { |
91 | /* In case anyone cares what the unknown value is */ | |
997399fa | 92 | sys_info->freq_localbus = lcrr_div; |
ada591d2 | 93 | } |
debb7354 JL |
94 | } |
95 | ||
96 | ||
debb7354 JL |
97 | /* |
98 | * Measure CPU clock speed (core clock GCLK1, GCLK2) | |
debb7354 JL |
99 | * (Approx. GCLK frequency in Hz) |
100 | */ | |
101 | ||
5c9efb36 | 102 | int get_clocks(void) |
debb7354 | 103 | { |
debb7354 JL |
104 | sys_info_t sys_info; |
105 | ||
5c9efb36 | 106 | get_sys_info(&sys_info); |
997399fa PK |
107 | gd->cpu_clk = sys_info.freq_processor; |
108 | gd->bus_clk = sys_info.freq_systembus; | |
109 | gd->arch.lbc_clk = sys_info.freq_localbus; | |
1b9ed257 TT |
110 | |
111 | /* | |
112 | * The base clock for I2C depends on the actual SOC. Unfortunately, | |
113 | * there is no pattern that can be used to determine the frequency, so | |
114 | * the only choice is to look up the actual SOC number and use the value | |
115 | * for that SOC. This information is taken from application note | |
116 | * AN2919. | |
117 | */ | |
1425a87b | 118 | #ifdef CONFIG_ARCH_MPC8610 |
997399fa | 119 | gd->arch.i2c1_clk = sys_info.freq_systembus; |
1b9ed257 | 120 | #else |
997399fa | 121 | gd->arch.i2c1_clk = sys_info.freq_systembus / 2; |
1b9ed257 | 122 | #endif |
609e6ec3 | 123 | gd->arch.i2c2_clk = gd->arch.i2c1_clk; |
5c9efb36 JL |
124 | |
125 | if (gd->cpu_clk != 0) | |
126 | return 0; | |
127 | else | |
128 | return 1; | |
debb7354 JL |
129 | } |
130 | ||
5c9efb36 JL |
131 | |
132 | /* | |
debb7354 | 133 | * get_bus_freq |
5c9efb36 JL |
134 | * Return system bus freq in Hz |
135 | */ | |
c934f655 | 136 | |
5c9efb36 | 137 | ulong get_bus_freq(ulong dummy) |
debb7354 JL |
138 | { |
139 | ulong val; | |
debb7354 JL |
140 | sys_info_t sys_info; |
141 | ||
5c9efb36 | 142 | get_sys_info(&sys_info); |
997399fa | 143 | val = sys_info.freq_systembus; |
debb7354 JL |
144 | |
145 | return val; | |
146 | } |