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ebf9d526 | 1 | /* |
ae6b03fe | 2 | * Copyright 2010-2011 Freescale Semiconductor, Inc. |
ebf9d526 | 3 | * |
1a459660 | 4 | * SPDX-License-Identifier: GPL-2.0+ |
ebf9d526 KG |
5 | */ |
6 | ||
7 | #include <common.h> | |
8 | #include <asm/io.h> | |
9 | ||
10 | #include "ics307_clk.h" | |
11 | ||
ae6b03fe | 12 | #if defined(CONFIG_FSL_NGPIXIS) |
ebf9d526 | 13 | #include "ngpixis.h" |
ae6b03fe SL |
14 | #define fpga_reg pixis |
15 | #elif defined(CONFIG_FSL_QIXIS) | |
16 | #include "qixis.h" | |
17 | #define fpga_reg ((struct qixis *)QIXIS_BASE) | |
ebf9d526 KG |
18 | #else |
19 | #include "pixis.h" | |
ae6b03fe | 20 | #define fpga_reg pixis |
ebf9d526 KG |
21 | #endif |
22 | ||
71775d3b JH |
23 | /* define for SYS CLK or CLK1Frequency */ |
24 | #define TTL 1 | |
25 | #define CLK2 0 | |
26 | #define CRYSTAL 0 | |
27 | #define MAX_VDW (511 + 8) | |
28 | #define MAX_RDW (127 + 2) | |
29 | #define MIN_VDW (4 + 8) | |
30 | #define MIN_RDW (1 + 2) | |
31 | #define NUM_OD_SETTING 8 | |
32 | /* | |
33 | * These defines cover the industrial temperature range part, | |
34 | * for commercial, change below to 400000 and 55000, respectively | |
35 | */ | |
36 | #define MAX_VCO 360000 | |
37 | #define MIN_VCO 60000 | |
38 | ||
ebf9d526 KG |
39 | /* decode S[0-2] to Output Divider (OD) */ |
40 | static u8 ics307_s_to_od[] = { | |
41 | 10, 2, 8, 4, 5, 7, 3, 6 | |
42 | }; | |
43 | ||
71775d3b JH |
44 | /* |
45 | * Find one solution to generate required frequency for SYSCLK | |
46 | * out_freq: KHz, required frequency to the SYSCLK | |
47 | * the result will be retuned with component RDW, VDW, OD, TTL, | |
48 | * CLK2 and crystal | |
49 | */ | |
50 | unsigned long ics307_sysclk_calculator(unsigned long out_freq) | |
51 | { | |
52 | const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ; | |
53 | unsigned long vdw, rdw, odp, s_vdw = 0, s_rdw = 0, s_odp = 0, od; | |
54 | unsigned long tmp_out, diff, result = 0; | |
55 | int found = 0; | |
56 | ||
57 | for (odp = 0; odp < NUM_OD_SETTING; odp++) { | |
58 | od = ics307_s_to_od[odp]; | |
59 | if (od * out_freq < MIN_VCO || od * out_freq > MAX_VCO) | |
60 | continue; | |
61 | for (rdw = MIN_RDW; rdw <= MAX_RDW; rdw++) { | |
62 | /* Calculate the VDW */ | |
63 | vdw = out_freq * 1000 * od * rdw / (input_freq * 2); | |
64 | if (vdw > MAX_VDW) | |
65 | vdw = MAX_VDW; | |
66 | if (vdw < MIN_VDW) | |
67 | continue; | |
68 | /* Calculate the temp out frequency */ | |
69 | tmp_out = input_freq * 2 * vdw / (rdw * od * 1000); | |
70 | diff = MAX(out_freq, tmp_out) - MIN(out_freq, tmp_out); | |
71 | /* | |
72 | * calculate the percent, the precision is 1/1000 | |
73 | * If greater than 1/1000, continue | |
74 | * otherwise, we think the solution is we required | |
75 | */ | |
76 | if (diff * 1000 / out_freq > 1) | |
77 | continue; | |
78 | else { | |
79 | s_vdw = vdw; | |
80 | s_rdw = rdw; | |
81 | s_odp = odp; | |
82 | found = 1; | |
83 | break; | |
84 | } | |
85 | } | |
86 | } | |
87 | ||
88 | if (found) | |
89 | result = (s_rdw - 2) | (s_vdw - 8) << 7 | s_odp << 16 | | |
90 | CLK2 << 19 | TTL << 21 | CRYSTAL << 22; | |
91 | ||
92 | debug("ICS307-02: RDW: %ld, VDW: %ld, OD: %d\n", s_rdw - 2, s_vdw - 8, | |
93 | ics307_s_to_od[s_odp]); | |
94 | return result; | |
95 | } | |
96 | ||
ebf9d526 KG |
97 | /* |
98 | * Calculate frequency being generated by ICS307-02 clock chip based upon | |
99 | * the control bytes being programmed into it. | |
100 | */ | |
101 | static unsigned long ics307_clk_freq(u8 cw0, u8 cw1, u8 cw2) | |
102 | { | |
103 | const unsigned long input_freq = CONFIG_ICS307_REFCLK_HZ; | |
104 | unsigned long vdw = ((cw1 << 1) & 0x1FE) + ((cw2 >> 7) & 1); | |
105 | unsigned long rdw = cw2 & 0x7F; | |
106 | unsigned long od = ics307_s_to_od[cw0 & 0x7]; | |
107 | unsigned long freq; | |
108 | ||
109 | /* | |
110 | * CLK1 Freq = Input Frequency * 2 * (VDW + 8) / ((RDW + 2) * OD) | |
111 | * | |
112 | * cw0: C1 C0 TTL F1 F0 S2 S1 S0 | |
113 | * cw1: V8 V7 V6 V5 V4 V3 V2 V1 | |
114 | * cw2: V0 R6 R5 R4 R3 R2 R1 R0 | |
115 | * | |
116 | * R6:R0 = Reference Divider Word (RDW) | |
117 | * V8:V0 = VCO Divider Word (VDW) | |
118 | * S2:S0 = Output Divider Select (OD) | |
119 | * F1:F0 = Function of CLK2 Output | |
120 | * TTL = duty cycle | |
121 | * C1:C0 = internal load capacitance for cyrstal | |
122 | * | |
123 | */ | |
124 | ||
125 | freq = input_freq * 2 * (vdw + 8) / ((rdw + 2) * od); | |
126 | ||
127 | debug("ICS307: CW[0-2]: %02X %02X %02X => %lu Hz\n", cw0, cw1, cw2, | |
128 | freq); | |
129 | return freq; | |
130 | } | |
131 | ||
132 | unsigned long get_board_sys_clk(void) | |
133 | { | |
134 | return ics307_clk_freq( | |
ae6b03fe SL |
135 | in_8(&fpga_reg->sclk[0]), |
136 | in_8(&fpga_reg->sclk[1]), | |
137 | in_8(&fpga_reg->sclk[2])); | |
ebf9d526 KG |
138 | } |
139 | ||
140 | unsigned long get_board_ddr_clk(void) | |
141 | { | |
142 | return ics307_clk_freq( | |
ae6b03fe SL |
143 | in_8(&fpga_reg->dclk[0]), |
144 | in_8(&fpga_reg->dclk[1]), | |
145 | in_8(&fpga_reg->dclk[2])); | |
ebf9d526 | 146 | } |