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/*
*
* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/processor.h>
#include <asm/immap.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Low Power Divider specifications
*/
#define CLOCK_LPD_MIN (1 << 0) /* Divider (decoded) */
#define CLOCK_LPD_MAX (1 << 15) /* Divider (decoded) */
#define CLOCK_PLL_FVCO_MAX 540000000
#define CLOCK_PLL_FVCO_MIN 300000000
#define CLOCK_PLL_FSYS_MAX 266666666
#define CLOCK_PLL_FSYS_MIN 100000000
#define MHZ 1000000
void clock_enter_limp(int lpdiv)
{
volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
int i, j;
/* Check bounds of divider */
if (lpdiv < CLOCK_LPD_MIN)
lpdiv = CLOCK_LPD_MIN;
if (lpdiv > CLOCK_LPD_MAX)
lpdiv = CLOCK_LPD_MAX;
/* Round divider down to nearest power of two */
for (i = 0, j = lpdiv; j != 1; j >>= 1, i++) ;
/* Apply the divider to the system clock */
ccm->cdr = (ccm->cdr & 0xF0FF) | CCM_CDR_LPDIV(i);
/* Enable Limp Mode */
ccm->misccr |= CCM_MISCCR_LIMP;
}
/*
* brief Exit Limp mode
* warning The PLL should be set and locked prior to exiting Limp mode
*/
void clock_exit_limp(void)
{
volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
volatile pll_t *pll = (volatile pll_t *)MMAP_PLL;
/* Exit Limp mode */
ccm->misccr &= ~CCM_MISCCR_LIMP;
/* Wait for the PLL to lock */
while (!(pll->psr & PLL_PSR_LOCK)) ;
}
/*
* get_clocks() fills in gd->cpu_clock and gd->bus_clk
*/
int get_clocks(void)
{
volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
volatile pll_t *pll = (volatile pll_t *)MMAP_PLL;
int pllmult_nopci[] = { 20, 10, 24, 18, 12, 6, 16, 8 };
int pllmult_pci[] = { 12, 6, 16, 8 };
int vco = 0, bPci, temp, fbtemp, pcrvalue;
int *pPllmult = NULL;
u16 fbpll_mask;
#ifdef CONFIG_M54455EVB
volatile u8 *cpld = (volatile u8 *)(CFG_CS2_BASE + 3);
#endif
u8 bootmode;
/* To determine PCI is present or not */
if (((ccm->ccr & CCM_CCR_360_FBCONFIG_MASK) == 0x00e0) ||
((ccm->ccr & CCM_CCR_360_FBCONFIG_MASK) == 0x0060)) {
pPllmult = &pllmult_pci[0];
fbpll_mask = 3; /* 11b */
bPci = 1;
} else {
pPllmult = &pllmult_nopci[0];
fbpll_mask = 7; /* 111b */
#ifdef CONFIG_PCI
gd->pci_clk = 0;
#endif
bPci = 0;
}
#ifdef CONFIG_M54455EVB
bootmode = (*cpld & 0x03);
if (bootmode != 3) {
/* Temporary read from CCR- fixed fb issue, must be the same clock
as pci or input clock, causing cpld/fpga read inconsistancy */
fbtemp = pPllmult[ccm->ccr & fbpll_mask];
/* Break down into small pieces, code still in flex bus */
pcrvalue = pll->pcr & 0xFFFFF0FF;
temp = fbtemp - 1;
pcrvalue |= PLL_PCR_OUTDIV3(temp);
pll->pcr = pcrvalue;
}
#endif
#ifdef CONFIG_M54451EVB
/* No external logic to read the bootmode, hard coded from built */
#ifdef CONFIG_CF_SBF
bootmode = 3;
#else
bootmode = 2;
/* default value is 16 mul, set to 20 mul */
pcrvalue = (pll->pcr & 0x00FFFFFF) | 0x14000000;
pll->pcr = pcrvalue;
while ((pll->psr & PLL_PSR_LOCK) != PLL_PSR_LOCK);
#endif
#endif
if (bootmode == 0) {
/* RCON mode */
vco = pPllmult[ccm->rcon & fbpll_mask] * CFG_INPUT_CLKSRC;
if ((vco < CLOCK_PLL_FVCO_MIN) || (vco > CLOCK_PLL_FVCO_MAX)) {
/* invaild range, re-set in PCR */
int temp = ((pll->pcr & PLL_PCR_OUTDIV2_MASK) >> 4) + 1;
int i, j, bus;
j = (pll->pcr & 0xFF000000) >> 24;
for (i = j; i < 0xFF; i++) {
vco = i * CFG_INPUT_CLKSRC;
if (vco >= CLOCK_PLL_FVCO_MIN) {
bus = vco / temp;
if (bus <= CLOCK_PLL_FSYS_MIN - MHZ)
continue;
else
break;
}
}
pcrvalue = pll->pcr & 0x00FF00FF;
fbtemp = ((i - 1) << 8) | ((i - 1) << 12);
pcrvalue |= ((i << 24) | fbtemp);
pll->pcr = pcrvalue;
}
gd->vco_clk = vco; /* Vco clock */
} else if (bootmode == 2) {
/* Normal mode */
vco = ((pll->pcr & 0xFF000000) >> 24) * CFG_INPUT_CLKSRC;
if ((vco < CLOCK_PLL_FVCO_MIN) || (vco > CLOCK_PLL_FVCO_MAX)) {
/* Default value */
pcrvalue = (pll->pcr & 0x00FFFFFF);
pcrvalue |= pPllmult[ccm->ccr & fbpll_mask] << 24;
pll->pcr = pcrvalue;
vco = ((pll->pcr & 0xFF000000) >> 24) * CFG_INPUT_CLKSRC;
}
gd->vco_clk = vco; /* Vco clock */
} else if (bootmode == 3) {
/* serial mode */
vco = ((pll->pcr & 0xFF000000) >> 24) * CFG_INPUT_CLKSRC;
gd->vco_clk = vco; /* Vco clock */
}
if ((ccm->ccr & CCM_MISCCR_LIMP) == CCM_MISCCR_LIMP) {
/* Limp mode */
} else {
gd->inp_clk = CFG_INPUT_CLKSRC; /* Input clock */
temp = (pll->pcr & PLL_PCR_OUTDIV1_MASK) + 1;
gd->cpu_clk = vco / temp; /* cpu clock */
temp = ((pll->pcr & PLL_PCR_OUTDIV2_MASK) >> 4) + 1;
gd->bus_clk = vco / temp; /* bus clock */
temp = ((pll->pcr & PLL_PCR_OUTDIV3_MASK) >> 8) + 1;
gd->flb_clk = vco / temp; /* FlexBus clock */
#ifdef CONFIG_PCI
if (bPci) {
temp = ((pll->pcr & PLL_PCR_OUTDIV4_MASK) >> 12) + 1;
gd->pci_clk = vco / temp; /* PCI clock */
}
#endif
}
return (0);
}
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