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Introduce PLL_CFG[0:4] table for processor 7448/7447A/7455/7457. The original

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multiplier table can not refect the real PLL clock behavior of these
processors. Please refer to the hardware specification for detailed
information of the corresponding processors.
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
This commit is contained in:
roy zang 2006-12-04 17:54:21 +08:00 committed by Zang Tiefei
parent 4efe20c957
commit 4dbcd69e3e
1 changed files with 7 additions and 11 deletions
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18
cpu/74xx_7xx/speed.c
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@ -52,7 +52,8 @@ static const int hid1_multipliers_x_10[] = {
0 /* 1111 - off */
};
static const int hid1_7447A_multipliers_x_10[] = {
/* 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 */
@ -66,7 +67,7 @@ static const int hid1_7447A_multipliers_x_10[] = {
65, /* 01010 - 6.5x */
130, /* 01011 - 13x */
85, /* 01100 - 8.5x */
240, /* 01101 - 13x */
240, /* 01101 - 24x */
95, /* 01110 - 9.5x */
90, /* 01111 - 9x */
30, /* 10000 - 3x */
@ -126,29 +127,24 @@ int get_clocks (void)
{
ulong clock = 0;
#ifdef CFG_CONFIG_BUS_CLK
gd->bus_clk = get_board_bus_clk (); /* bus clock is configurable */
#else
#ifdef CFG_BUS_CLK
gd->bus_clk = CFG_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:
clock = (gd->bus_clk / 10) *
hid1_7447A_multipliers_x_10[(get_hid1 () >> 12) & 0x1F];
break;
case CPU_7455:
case CPU_7457:
/*
* It is assumed that the PLL_EXT line is zero.
* 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 () >> 13) & 0xF];
hid1_74xx_multipliers_x_10[(get_hid1 () >> 12) & 0x1F];
break;
case CPU_750GX: