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// SPDX-License-Identifier: GPL-2.0+
/*
*
* Copyright (C) 2004-2007, 2012 Freescale Semiconductor, Inc.
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*/
#include <common.h>
#include <clock_legacy.h>
#include <asm/global_data.h>
#include <asm/processor.h>
#include <asm/immap.h>
#include <asm/io.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)
{
ccm_t *ccm = (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++) ;
/* Enable Limp Mode */
setbits_be16(&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)
{
ccm_t *ccm = (ccm_t *)MMAP_CCM;
pll_t *pll = (pll_t *)MMAP_PLL;
/* Exit Limp mode */
clrbits_be16(&ccm->misccr, CCM_MISCCR_LIMP);
/* Wait for the PLL to lock */
while (!(in_be32(&pll->psr) & PLL_PSR_LOCK))
;
}
#ifdef CONFIG_MCF5441x
void setup_5441x_clocks(void)
{
ccm_t *ccm = (ccm_t *)MMAP_CCM;
pll_t *pll = (pll_t *)MMAP_PLL;
int temp, vco = 0, bootmod_ccr, pdr;
bootmod_ccr = (in_be16(&ccm->ccr) & CCM_CCR_BOOTMOD) >> 14;
switch (bootmod_ccr) {
case 0:
out_be32(&pll->pcr, 0x00000013);
out_be32(&pll->pdr, 0x00e70c61);
clock_exit_limp();
break;
case 2:
break;
case 3:
break;
}
/*Change frequency for Modelo SER1 USB host*/
#ifdef CONFIG_LOW_MCFCLK
temp = in_be32(&pll->pcr);
temp &= ~0x3f;
temp |= 5;
out_be32(&pll->pcr, temp);
temp = in_be32(&pll->pdr);
temp &= ~0x001f0000;
temp |= 0x00040000;
out_be32(&pll->pdr, temp);
__asm__("tpf");
#endif
setbits_be16(&ccm->misccr2, 0x02);
vco = ((in_be32(&pll->pcr) & PLL_CR_FBKDIV_BITS) + 1) *
CONFIG_SYS_INPUT_CLKSRC;
gd->arch.vco_clk = vco;
gd->arch.inp_clk = CONFIG_SYS_INPUT_CLKSRC; /* Input clock */
pdr = in_be32(&pll->pdr);
temp = (pdr & PLL_DR_OUTDIV1_BITS) + 1;
gd->cpu_clk = vco / temp; /* cpu clock */
gd->arch.flb_clk = vco / temp; /* FlexBus clock */
gd->arch.flb_clk >>= 1;
if (in_be16(&ccm->misccr2) & 2) /* fsys/4 */
gd->arch.flb_clk >>= 1;
temp = ((pdr & PLL_DR_OUTDIV2_BITS) >> 5) + 1;
gd->bus_clk = vco / temp; /* bus clock */
temp = ((pdr & PLL_DR_OUTDIV3_BITS) >> 10) + 1;
gd->arch.sdhc_clk = vco / temp;
}
#endif
/* get_clocks() fills in gd->cpu_clock and gd->bus_clk */
int get_clocks(void)
{
#ifdef CONFIG_MCF5441x
setup_5441x_clocks();
#endif
#ifdef CONFIG_SYS_FSL_I2C
gd->arch.i2c1_clk = gd->bus_clk;
#endif
return (0);
}
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