u-boot/board/freescale/common/ngpixis.c
Jerry Huang 71775d3b54 powerpc/mpc85xx: Set SYSCLK to the required frequency
For ICS307-02, there is one general expression to generate SYSCLK:
CLK1Frequency = InputFrequency * 2 * (VDW + 8) / ((RDW + 2) * OD)

If we want the required frequency for SYSCLK, we must find one solution
to generate this frequency, this solution includes VDW, RDW and OD.
For OD, there are only eight option value: 10, 2, 8, 4, 5, 7, 3, 6.
For RDW, the range is 1 to 127.
For VDW, the range is 4 to 511.

First, we use one OD, RDW and required SYSCLK to calculate the VDW,
if VDW is in it's range, we will calculate the CLK1Frequency with
the OD, RDW and VDW calculated, and we will check this percent
(CLK1Frequency / required SYSCLK), and the precision is 1/1000.
if the percent is less than 1/1000, we think the CLK1Frequency is we want.
Otherwise, We will continue to calculate it with the next OD and RDW.

Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-11-11 07:48:54 -06:00

249 lines
6.5 KiB
C

/**
* Copyright 2010-2011 Freescale Semiconductor
* Author: Timur Tabi <timur@freescale.com>
*
* 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 file provides support for the ngPIXIS, a board-specific FPGA used on
* some Freescale reference boards.
*
* A "switch" is black rectangular block on the motherboard. It contains
* eight "bits". The ngPIXIS has a set of memory-mapped registers (SWx) that
* shadow the actual physical switches. There is also another set of
* registers (ENx) that tell the ngPIXIS which bits of SWx should actually be
* used to override the values of the bits in the physical switches.
*
* The following macros need to be defined:
*
* PIXIS_BASE - The virtual address of the base of the PIXIS register map
*
* PIXIS_LBMAP_SWITCH - The switch number (i.e. the "x" in "SWx"). This value
* is used in the PIXIS_SW() macro to determine which offset in
* the PIXIS register map corresponds to the physical switch that controls
* the boot bank.
*
* PIXIS_LBMAP_MASK - A bit mask the defines which bits in SWx to use.
*
* PIXIS_LBMAP_SHIFT - The shift value that corresponds to PIXIS_LBMAP_MASK.
*
* PIXIS_LBMAP_ALTBANK - The value to program into SWx to tell the ngPIXIS to
* boot from the alternate bank.
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
#include "ngpixis.h"
static u8 __pixis_read(unsigned int reg)
{
void *p = (void *)PIXIS_BASE;
return in_8(p + reg);
}
u8 pixis_read(unsigned int reg) __attribute__((weak, alias("__pixis_read")));
static void __pixis_write(unsigned int reg, u8 value)
{
void *p = (void *)PIXIS_BASE;
out_8(p + reg, value);
}
void pixis_write(unsigned int reg, u8 value)
__attribute__((weak, alias("__pixis_write")));
/*
* Reset the board. This ignores the ENx registers.
*/
void __pixis_reset(void)
{
PIXIS_WRITE(rst, 0);
while (1);
}
void pixis_reset(void) __attribute__((weak, alias("__pixis_reset")));
/*
* Reset the board. Like pixis_reset(), but it honors the ENx registers.
*/
void __pixis_bank_reset(void)
{
PIXIS_WRITE(vctl, 0);
PIXIS_WRITE(vctl, 1);
while (1);
}
void pixis_bank_reset(void) __attribute__((weak, alias("__pixis_bank_reset")));
/**
* Set the boot bank to the power-on default bank
*/
void __clear_altbank(void)
{
u8 reg;
/* Tell the ngPIXIS to use this the bits in the physical switch for the
* boot bank value, instead of the SWx register. We need to be careful
* only to set the bits in SWx that correspond to the boot bank.
*/
reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].en);
reg &= ~PIXIS_LBMAP_MASK;
PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].en, reg);
}
void clear_altbank(void) __attribute__((weak, alias("__clear_altbank")));
/**
* Set the boot bank to the alternate bank
*/
void __set_altbank(void)
{
u8 reg;
/* Program the alternate bank number into the SWx register.
*/
reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].sw);
reg = (reg & ~PIXIS_LBMAP_MASK) | PIXIS_LBMAP_ALTBANK;
PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].sw, reg);
/* Tell the ngPIXIS to use this the bits in the SWx register for the
* boot bank value, instead of the physical switch. We need to be
* careful only to set the bits in SWx that correspond to the boot bank.
*/
reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].en);
reg |= PIXIS_LBMAP_MASK;
PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].en, reg);
}
void set_altbank(void) __attribute__((weak, alias("__set_altbank")));
#ifdef DEBUG
static void pixis_dump_regs(void)
{
unsigned int i;
printf("id=%02x\n", PIXIS_READ(id));
printf("arch=%02x\n", PIXIS_READ(arch));
printf("scver=%02x\n", PIXIS_READ(scver));
printf("csr=%02x\n", PIXIS_READ(csr));
printf("rst=%02x\n", PIXIS_READ(rst));
printf("aux=%02x\n", PIXIS_READ(aux));
printf("spd=%02x\n", PIXIS_READ(spd));
printf("brdcfg0=%02x\n", PIXIS_READ(brdcfg0));
printf("brdcfg1=%02x\n", PIXIS_READ(brdcfg1));
printf("addr=%02x\n", PIXIS_READ(addr));
printf("data=%02x\n", PIXIS_READ(data));
printf("led=%02x\n", PIXIS_READ(led));
printf("vctl=%02x\n", PIXIS_READ(vctl));
printf("vstat=%02x\n", PIXIS_READ(vstat));
printf("vcfgen0=%02x\n", PIXIS_READ(vcfgen0));
printf("ocmcsr=%02x\n", PIXIS_READ(ocmcsr));
printf("ocmmsg=%02x\n", PIXIS_READ(ocmmsg));
printf("gmdbg=%02x\n", PIXIS_READ(gmdbg));
printf("sclk=%02x%02x%02x\n",
PIXIS_READ(sclk[0]), PIXIS_READ(sclk[1]), PIXIS_READ(sclk[2]));
printf("dclk=%02x%02x%02x\n",
PIXIS_READ(dclk[0]), PIXIS_READ(dclk[1]), PIXIS_READ(dclk[2]));
printf("watch=%02x\n", PIXIS_READ(watch));
for (i = 0; i < 8; i++) {
printf("SW%u=%02x/%02x ", i + 1,
PIXIS_READ(s[i].sw), PIXIS_READ(s[i].en));
}
putc('\n');
}
#endif
void pixis_sysclk_set(unsigned long sysclk)
{
unsigned long freq_word;
u8 sclk0, sclk1, sclk2;
freq_word = ics307_sysclk_calculator(sysclk);
sclk2 = freq_word & 0xff;
sclk1 = (freq_word >> 8) & 0xff;
sclk0 = (freq_word >> 16) & 0xff;
/* set SYSCLK enable bit */
PIXIS_WRITE(vcfgen0, 0x01);
/* SYSCLK to required frequency */
PIXIS_WRITE(sclk[0], sclk0);
PIXIS_WRITE(sclk[1], sclk1);
PIXIS_WRITE(sclk[2], sclk2);
}
int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unsigned int i;
unsigned long sysclk;
char *p_altbank = NULL;
#ifdef DEBUG
char *p_dump = NULL;
#endif
char *unknown_param = NULL;
/* No args is a simple reset request.
*/
if (argc <= 1)
pixis_reset();
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "altbank") == 0) {
p_altbank = argv[i];
continue;
}
#ifdef DEBUG
if (strcmp(argv[i], "dump") == 0) {
p_dump = argv[i];
continue;
}
#endif
if (strcmp(argv[i], "sysclk") == 0) {
sysclk = simple_strtoul(argv[i + 1], NULL, 0);
i += 1;
pixis_sysclk_set(sysclk);
continue;
}
unknown_param = argv[i];
}
if (unknown_param) {
printf("Invalid option: %s\n", unknown_param);
return 1;
}
#ifdef DEBUG
if (p_dump) {
pixis_dump_regs();
/* 'dump' ignores other commands */
return 0;
}
#endif
if (p_altbank)
set_altbank();
else
clear_altbank();
pixis_bank_reset();
/* Shouldn't be reached. */
return 0;
}
U_BOOT_CMD(
pixis_reset, CONFIG_SYS_MAXARGS, 1, pixis_reset_cmd,
"Reset the board using the FPGA sequencer",
"- hard reset to default bank\n"
"pixis_reset altbank - reset to alternate bank\n"
#ifdef DEBUG
"pixis_reset dump - display the PIXIS registers\n"
#endif
"pixis_reset sysclk <SYSCLK_freq> - reset with SYSCLK frequency(KHz)\n"
);