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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <74xx_7xx.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
extern unsigned long get_board_bus_clk (void);
static const int hid1_multipliers_x_10[] = {
25, /* 0000 - 2.5x */
75, /* 0001 - 7.5x */
70, /* 0010 - 7x */
10, /* 0011 - bypass */
20, /* 0100 - 2x */
65, /* 0101 - 6.5x */
100, /* 0110 - 10x */
45, /* 0111 - 4.5x */
30, /* 1000 - 3x */
55, /* 1001 - 5.5x */
40, /* 1010 - 4x */
50, /* 1011 - 5x */
80, /* 1100 - 8x */
60, /* 1101 - 6x */
35, /* 1110 - 3.5x */
0 /* 1111 - off */
};
/* PLL_CFG[0:4] table for cpu 7448/7447A/7455/7457 */
static const int hid1_74xx_multipliers_x_10[] = {
115, /* 00000 - 11.5x */
170, /* 00001 - 17x */
75, /* 00010 - 7.5x */
150, /* 00011 - 15x */
70, /* 00100 - 7x */
180, /* 00101 - 18x */
10, /* 00110 - bypass */
200, /* 00111 - 20x */
20, /* 01000 - 2x */
210, /* 01001 - 21x */
65, /* 01010 - 6.5x */
130, /* 01011 - 13x */
85, /* 01100 - 8.5x */
240, /* 01101 - 24x */
95, /* 01110 - 9.5x */
90, /* 01111 - 9x */
30, /* 10000 - 3x */
105, /* 10001 - 10.5x */
55, /* 10010 - 5.5x */
110, /* 10011 - 11x */
40, /* 10100 - 4x */
100, /* 10101 - 10x */
50, /* 10110 - 5x */
120, /* 10111 - 12x */
80, /* 11000 - 8x */
140, /* 11001 - 14x */
60, /* 11010 - 6x */
160, /* 11011 - 16x */
135, /* 11100 - 13.5x */
280, /* 11101 - 28x */
0, /* 11110 - off */
125 /* 11111 - 12.5x */
};
static const int hid1_fx_multipliers_x_10[] = {
00, /* 0000 - off */
00, /* 0001 - off */
10, /* 0010 - bypass */
10, /* 0011 - bypass */
20, /* 0100 - 2x */
25, /* 0101 - 2.5x */
30, /* 0110 - 3x */
35, /* 0111 - 3.5x */
40, /* 1000 - 4x */
45, /* 1001 - 4.5x */
50, /* 1010 - 5x */
55, /* 1011 - 5.5x */
60, /* 1100 - 6x */
65, /* 1101 - 6.5x */
70, /* 1110 - 7x */
75, /* 1111 - 7.5 */
80, /* 10000 - 8x */
85, /* 10001 - 8.5x */
90, /* 10010 - 9x */
95, /* 10011 - 9.5x */
100, /* 10100 - 10x */
110, /* 10101 - 11x */
120, /* 10110 - 12x */
};
/* ------------------------------------------------------------------------- */
/*
* Measure CPU clock speed (core clock GCLK1, GCLK2)
*
* (Approx. GCLK frequency in Hz)
*/
int get_clocks (void)
{
ulong clock = 0;
#ifdef CONFIG_SYS_BUS_CLK
gd->bus_clk = CONFIG_SYS_BUS_CLK; /* bus clock is a fixed frequency */
#else
gd->bus_clk = get_board_bus_clk (); /* bus clock is configurable */
#endif
/* calculate the clock frequency based upon the CPU type */
switch (get_cpu_type()) {
case CPU_7447A:
case CPU_7448:
case CPU_7455:
case CPU_7457:
/*
* Make sure division is done before multiplication to prevent 32-bit
* arithmetic overflows which will cause a negative number
*/
clock = (gd->bus_clk / 10) *
hid1_74xx_multipliers_x_10[(get_hid1 () >> 12) & 0x1F];
break;
case CPU_750GX:
case CPU_750FX:
clock = (gd->bus_clk / 10) *
hid1_fx_multipliers_x_10[get_hid1 () >> 27];
break;
case CPU_7450:
case CPU_740:
case CPU_740P:
case CPU_745:
case CPU_750CX:
case CPU_750:
case CPU_750P:
case CPU_755:
case CPU_7400:
case CPU_7410:
/*
* Make sure division is done before multiplication to prevent 32-bit
* arithmetic overflows which will cause a negative number
*/
clock = (gd->bus_clk / 10) *
hid1_multipliers_x_10[get_hid1 () >> 28];
break;
case CPU_UNKNOWN:
printf ("get_gclk_freq(): unknown CPU type\n");
clock = 0;
return (1);
}
gd->cpu_clk = clock;
return (0);
}
/* ------------------------------------------------------------------------- */
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