mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-18 17:18:01 +09:00
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>
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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*
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* Copyright (C) 2004-2007, 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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/*
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* Low Power Divider specifications
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*/
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#define CLOCK_LPD_MIN (1 << 0) /* Divider (decoded) */
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#define CLOCK_LPD_MAX (1 << 15) /* Divider (decoded) */
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#define CLOCK_PLL_FVCO_MAX 540000000
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#define CLOCK_PLL_FVCO_MIN 300000000
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#define CLOCK_PLL_FSYS_MAX 266666666
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#define CLOCK_PLL_FSYS_MIN 100000000
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#define MHZ 1000000
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void clock_enter_limp(int lpdiv)
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{
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ccm_t *ccm = (ccm_t *)MMAP_CCM;
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int i, j;
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/* Check bounds of divider */
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if (lpdiv < CLOCK_LPD_MIN)
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lpdiv = CLOCK_LPD_MIN;
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if (lpdiv > CLOCK_LPD_MAX)
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lpdiv = CLOCK_LPD_MAX;
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/* Round divider down to nearest power of two */
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for (i = 0, j = lpdiv; j != 1; j >>= 1, i++) ;
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/* Apply the divider to the system clock */
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clrsetbits_be16(&ccm->cdr, 0x0f00, CCM_CDR_LPDIV(i));
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/* Enable Limp Mode */
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setbits_be16(&ccm->misccr, CCM_MISCCR_LIMP);
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}
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/*
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* brief Exit Limp mode
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* warning The PLL should be set and locked prior to exiting Limp mode
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*/
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void clock_exit_limp(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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/* Exit Limp mode */
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clrbits_be16(&ccm->misccr, CCM_MISCCR_LIMP);
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/* Wait for the PLL to lock */
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while (!(in_be32(&pll->psr) & PLL_PSR_LOCK))
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;
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}
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/*
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* get_clocks() fills in gd->cpu_clock and gd->bus_clk
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*/
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int get_clocks(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 vco, temp, pcrvalue, pfdr;
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u8 bootmode;
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pcrvalue = in_be32(&pll->pcr) & 0xFF0F0FFF;
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pfdr = pcrvalue >> 24;
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if (pfdr == 0x1E)
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bootmode = 0; /* Normal Mode */
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#ifdef CONFIG_CF_SBF
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bootmode = 3; /* Serial Mode */
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#endif
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if (bootmode == 0) {
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/* Normal mode */
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vco = ((in_be32(&pll->pcr) & 0xFF000000) >> 24) * CONFIG_SYS_INPUT_CLKSRC;
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if ((vco < CLOCK_PLL_FVCO_MIN) || (vco > CLOCK_PLL_FVCO_MAX)) {
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/* Default value */
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pcrvalue = (in_be32(&pll->pcr) & 0x00FFFFFF);
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pcrvalue |= 0x1E << 24;
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out_be32(&pll->pcr, pcrvalue);
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vco =
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((in_be32(&pll->pcr) & 0xFF000000) >> 24) *
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CONFIG_SYS_INPUT_CLKSRC;
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}
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gd->arch.vco_clk = vco; /* Vco clock */
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} else if (bootmode == 3) {
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/* serial mode */
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vco = ((in_be32(&pll->pcr) & 0xFF000000) >> 24) * CONFIG_SYS_INPUT_CLKSRC;
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gd->arch.vco_clk = vco; /* Vco clock */
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}
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if ((in_be16(&ccm->ccr) & CCM_MISCCR_LIMP) == CCM_MISCCR_LIMP) {
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/* Limp mode */
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} else {
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gd->arch.inp_clk = CONFIG_SYS_INPUT_CLKSRC; /* Input clock */
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temp = (in_be32(&pll->pcr) & PLL_PCR_OUTDIV1_MASK) + 1;
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gd->cpu_clk = vco / temp; /* cpu clock */
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temp = ((in_be32(&pll->pcr) & PLL_PCR_OUTDIV2_MASK) >> 4) + 1;
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gd->arch.flb_clk = vco / temp; /* flexbus clock */
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gd->bus_clk = gd->arch.flb_clk;
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}
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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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