mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
261 lines
6.1 KiB
C
261 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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*
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Copyright (C) 2004-2008, 2012 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <asm/immap.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* PLL min/max specifications */
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#define MAX_FVCO 500000 /* KHz */
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#define MAX_FSYS 80000 /* KHz */
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#define MIN_FSYS 58333 /* KHz */
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#ifdef CONFIG_MCF5301x
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#define FREF 20000 /* KHz */
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#define MAX_MFD 63 /* Multiplier */
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#define MIN_MFD 0 /* Multiplier */
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#define USBDIV 8
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/* Low Power Divider specifications */
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#define MIN_LPD (0) /* Divider (not encoded) */
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#define MAX_LPD (15) /* Divider (not encoded) */
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#define DEFAULT_LPD (0) /* Divider (not encoded) */
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#endif
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#ifdef CONFIG_MCF532x
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#define FREF 16000 /* KHz */
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#define MAX_MFD 135 /* Multiplier */
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#define MIN_MFD 88 /* Multiplier */
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/* Low Power Divider specifications */
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#define MIN_LPD (1 << 0) /* Divider (not encoded) */
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#define MAX_LPD (1 << 15) /* Divider (not encoded) */
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#define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
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#endif
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#define BUSDIV 6 /* Divider */
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/* Get the value of the current system clock */
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int get_sys_clock(void)
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{
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ccm_t *ccm = (ccm_t *)(MMAP_CCM);
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pll_t *pll = (pll_t *)(MMAP_PLL);
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int divider;
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/* Test to see if device is in LIMP mode */
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if (in_be16(&ccm->misccr) & CCM_MISCCR_LIMP) {
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divider = in_be16(&ccm->cdr) & CCM_CDR_LPDIV(0xF);
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#ifdef CONFIG_MCF5301x
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return (FREF / (3 * (1 << divider)));
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#endif
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#ifdef CONFIG_MCF532x
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return (FREF / (2 << divider));
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#endif
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} else {
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#ifdef CONFIG_MCF5301x
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u32 pfdr = (in_be32(&pll->pcr) & 0x3F) + 1;
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u32 refdiv = (1 << ((in_be32(&pll->pcr) & PLL_PCR_REFDIV(7)) >> 8));
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u32 busdiv = ((in_be32(&pll->pdr) & 0x00F0) >> 4) + 1;
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return (((FREF * pfdr) / refdiv) / busdiv);
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#endif
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#ifdef CONFIG_MCF532x
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return (FREF * in_8(&pll->pfdr)) / (BUSDIV * 4);
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#endif
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}
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}
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/*
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* Initialize the Low Power Divider circuit
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*
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* Parameters:
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* div Desired system frequency divider
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*
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* Return Value:
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* The resulting output system frequency
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*/
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int clock_limp(int div)
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{
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ccm_t *ccm = (ccm_t *)(MMAP_CCM);
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u32 temp;
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/* Check bounds of divider */
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if (div < MIN_LPD)
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div = MIN_LPD;
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if (div > MAX_LPD)
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div = MAX_LPD;
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/* Save of the current value of the SSIDIV so we don't overwrite the value */
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temp = (in_be16(&ccm->cdr) & CCM_CDR_SSIDIV(0xFF));
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/* Apply the divider to the system clock */
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out_be16(&ccm->cdr, CCM_CDR_LPDIV(div) | CCM_CDR_SSIDIV(temp));
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setbits_be16(&ccm->misccr, CCM_MISCCR_LIMP);
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return (FREF / (3 * (1 << div)));
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}
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/* Exit low power LIMP mode */
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int clock_exit_limp(void)
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{
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ccm_t *ccm = (ccm_t *)(MMAP_CCM);
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int fout;
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/* Exit LIMP mode */
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clrbits_be16(&ccm->misccr, CCM_MISCCR_LIMP);
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/* Wait for PLL to lock */
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while (!(in_be16(&ccm->misccr) & CCM_MISCCR_PLL_LOCK))
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;
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fout = get_sys_clock();
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return fout;
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}
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/* Initialize the PLL
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*
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* Parameters:
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* fref PLL reference clock frequency in KHz
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* fsys Desired PLL output frequency in KHz
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* flags Operating parameters
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*
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* Return Value:
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* The resulting output system frequency
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*/
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int clock_pll(int fsys, int flags)
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{
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#ifdef CONFIG_MCF532x
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u32 *sdram_workaround = (u32 *)(MMAP_SDRAM + 0x80);
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#endif
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sdram_t *sdram = (sdram_t *)(MMAP_SDRAM);
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pll_t *pll = (pll_t *)(MMAP_PLL);
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int fref, temp, fout, mfd;
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u32 i;
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fref = FREF;
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if (fsys == 0) {
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/* Return current PLL output */
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#ifdef CONFIG_MCF5301x
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u32 busdiv = ((in_be32(&pll->pdr) >> 4) & 0x0F) + 1;
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mfd = (in_be32(&pll->pcr) & 0x3F) + 1;
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return (fref * mfd) / busdiv;
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#endif
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#ifdef CONFIG_MCF532x
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mfd = in_8(&pll->pfdr);
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return (fref * mfd / (BUSDIV * 4));
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#endif
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}
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/* Check bounds of requested system clock */
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if (fsys > MAX_FSYS)
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fsys = MAX_FSYS;
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if (fsys < MIN_FSYS)
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fsys = MIN_FSYS;
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/*
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* Multiplying by 100 when calculating the temp value,
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* and then dividing by 100 to calculate the mfd allows
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* for exact values without needing to include floating
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* point libraries.
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*/
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temp = (100 * fsys) / fref;
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#ifdef CONFIG_MCF5301x
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mfd = (BUSDIV * temp) / 100;
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/* Determine the output frequency for selected values */
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fout = ((fref * mfd) / BUSDIV);
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#endif
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#ifdef CONFIG_MCF532x
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mfd = (4 * BUSDIV * temp) / 100;
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/* Determine the output frequency for selected values */
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fout = ((fref * mfd) / (BUSDIV * 4));
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#endif
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/* must not tamper with SDRAMC if running from SDRAM */
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#if !defined(CONFIG_MONITOR_IS_IN_RAM)
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/*
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* Check to see if the SDRAM has already been initialized.
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* If it has then the SDRAM needs to be put into self refresh
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* mode before reprogramming the PLL.
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*/
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if (in_be32(&sdram->ctrl) & SDRAMC_SDCR_REF)
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clrbits_be32(&sdram->ctrl, SDRAMC_SDCR_CKE);
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/*
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* Initialize the PLL to generate the new system clock frequency.
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* The device must be put into LIMP mode to reprogram the PLL.
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*/
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/* Enter LIMP mode */
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clock_limp(DEFAULT_LPD);
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#ifdef CONFIG_MCF5301x
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out_be32(&pll->pdr,
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PLL_PDR_OUTDIV1((BUSDIV / 3) - 1) |
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PLL_PDR_OUTDIV2(BUSDIV - 1) |
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PLL_PDR_OUTDIV3((BUSDIV / 2) - 1) |
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PLL_PDR_OUTDIV4(USBDIV - 1));
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clrbits_be32(&pll->pcr, ~PLL_PCR_FBDIV_UNMASK);
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setbits_be32(&pll->pcr, PLL_PCR_FBDIV(mfd - 1));
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#endif
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#ifdef CONFIG_MCF532x
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/* Reprogram PLL for desired fsys */
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out_8(&pll->podr,
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PLL_PODR_CPUDIV(BUSDIV / 3) | PLL_PODR_BUSDIV(BUSDIV));
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out_8(&pll->pfdr, mfd);
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#endif
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/* Exit LIMP mode */
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clock_exit_limp();
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/* Return the SDRAM to normal operation if it is in use. */
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if (in_be32(&sdram->ctrl) & SDRAMC_SDCR_REF)
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setbits_be32(&sdram->ctrl, SDRAMC_SDCR_CKE);
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#ifdef CONFIG_MCF532x
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/*
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* software workaround for SDRAM opeartion after exiting LIMP
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* mode errata
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*/
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out_be32(sdram_workaround, CONFIG_SYS_SDRAM_BASE);
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#endif
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/* wait for DQS logic to relock */
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for (i = 0; i < 0x200; i++) ;
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#endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */
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return fout;
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}
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/* get_clocks() fills in gd->cpu_clock and gd->bus_clk */
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int get_clocks(void)
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{
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gd->bus_clk = clock_pll(CONFIG_SYS_CLK / 1000, 0) * 1000;
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gd->cpu_clk = (gd->bus_clk * 3);
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#ifdef CONFIG_SYS_I2C_FSL
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gd->arch.i2c1_clk = gd->bus_clk;
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#endif
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return (0);
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}
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