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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2009 DENX Software Engineering
- * Author: John Rigby <jrigby@gmail.com>
- *
- * Based on mx27/generic.c:
- * Copyright (c) 2008 Eric Jarrige <eric.jarrige@armadeus.org>
- * Copyright (c) 2009 Ilya Yanok <yanok@emcraft.com>
- */
- #include <common.h>
- #include <clock_legacy.h>
- #include <div64.h>
- #include <netdev.h>
- #include <vsprintf.h>
- #include <asm/io.h>
- #include <asm/arch-imx/cpu.h>
- #include <asm/arch/imx-regs.h>
- #include <asm/arch/clock.h>
- #ifdef CONFIG_FSL_ESDHC_IMX
- #include <fsl_esdhc_imx.h>
- DECLARE_GLOBAL_DATA_PTR;
- #endif
- /*
- * get the system pll clock in Hz
- *
- * mfi + mfn / (mfd +1)
- * f = 2 * f_ref * --------------------
- * pd + 1
- */
- static unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
- {
- unsigned int mfi = (pll >> CCM_PLL_MFI_SHIFT)
- & CCM_PLL_MFI_MASK;
- int mfn = (pll >> CCM_PLL_MFN_SHIFT)
- & CCM_PLL_MFN_MASK;
- unsigned int mfd = (pll >> CCM_PLL_MFD_SHIFT)
- & CCM_PLL_MFD_MASK;
- unsigned int pd = (pll >> CCM_PLL_PD_SHIFT)
- & CCM_PLL_PD_MASK;
- mfi = mfi <= 5 ? 5 : mfi;
- mfn = mfn >= 512 ? mfn - 1024 : mfn;
- mfd += 1;
- pd += 1;
- return lldiv(2 * (u64) f_ref * (mfi * mfd + mfn),
- mfd * pd);
- }
- static ulong imx_get_mpllclk(void)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong fref = MXC_HCLK;
- return imx_decode_pll(readl(&ccm->mpctl), fref);
- }
- static ulong imx_get_upllclk(void)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong fref = MXC_HCLK;
- return imx_decode_pll(readl(&ccm->upctl), fref);
- }
- static ulong imx_get_armclk(void)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong cctl = readl(&ccm->cctl);
- ulong fref = imx_get_mpllclk();
- ulong div;
- if (cctl & CCM_CCTL_ARM_SRC)
- fref = lldiv((u64) fref * 3, 4);
- div = ((cctl >> CCM_CCTL_ARM_DIV_SHIFT)
- & CCM_CCTL_ARM_DIV_MASK) + 1;
- return fref / div;
- }
- static ulong imx_get_ahbclk(void)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong cctl = readl(&ccm->cctl);
- ulong fref = imx_get_armclk();
- ulong div;
- div = ((cctl >> CCM_CCTL_AHB_DIV_SHIFT)
- & CCM_CCTL_AHB_DIV_MASK) + 1;
- return fref / div;
- }
- static ulong imx_get_ipgclk(void)
- {
- return imx_get_ahbclk() / 2;
- }
- static ulong imx_get_perclk(int clk)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong fref = readl(&ccm->mcr) & (1 << clk) ? imx_get_upllclk() :
- imx_get_ahbclk();
- ulong div;
- div = readl(&ccm->pcdr[CCM_PERCLK_REG(clk)]);
- div = ((div >> CCM_PERCLK_SHIFT(clk)) & CCM_PERCLK_MASK) + 1;
- return fref / div;
- }
- int imx_set_perclk(enum mxc_clock clk, bool from_upll, unsigned int freq)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong fref = from_upll ? imx_get_upllclk() : imx_get_ahbclk();
- ulong div = (fref + freq - 1) / freq;
- if (clk > MXC_UART_CLK || !div || --div > CCM_PERCLK_MASK)
- return -EINVAL;
- clrsetbits_le32(&ccm->pcdr[CCM_PERCLK_REG(clk)],
- CCM_PERCLK_MASK << CCM_PERCLK_SHIFT(clk),
- div << CCM_PERCLK_SHIFT(clk));
- if (from_upll)
- setbits_le32(&ccm->mcr, 1 << clk);
- else
- clrbits_le32(&ccm->mcr, 1 << clk);
- return 0;
- }
- unsigned int mxc_get_clock(enum mxc_clock clk)
- {
- if (clk >= MXC_CLK_NUM)
- return -1;
- switch (clk) {
- case MXC_ARM_CLK:
- return imx_get_armclk();
- case MXC_AHB_CLK:
- return imx_get_ahbclk();
- case MXC_IPG_CLK:
- case MXC_CSPI_CLK:
- case MXC_FEC_CLK:
- return imx_get_ipgclk();
- default:
- return imx_get_perclk(clk);
- }
- }
- u32 get_cpu_rev(void)
- {
- u32 srev;
- u32 system_rev = 0x25000;
- /* read SREV register from IIM module */
- struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
- srev = readl(&iim->iim_srev);
- switch (srev) {
- case 0x00:
- system_rev |= CHIP_REV_1_0;
- break;
- case 0x01:
- system_rev |= CHIP_REV_1_1;
- break;
- case 0x02:
- system_rev |= CHIP_REV_1_2;
- break;
- default:
- system_rev |= 0x8000;
- break;
- }
- return system_rev;
- }
- #if defined(CONFIG_DISPLAY_CPUINFO)
- static char *get_reset_cause(void)
- {
- /* read RCSR register from CCM module */
- struct ccm_regs *ccm =
- (struct ccm_regs *)IMX_CCM_BASE;
- u32 cause = readl(&ccm->rcsr) & 0x0f;
- if (cause == 0)
- return "POR";
- else if (cause == 1)
- return "RST";
- else if ((cause & 2) == 2)
- return "WDOG";
- else if ((cause & 4) == 4)
- return "SW RESET";
- else if ((cause & 8) == 8)
- return "JTAG";
- else
- return "unknown reset";
- }
- int print_cpuinfo(void)
- {
- char buf[32];
- u32 cpurev = get_cpu_rev();
- printf("CPU: Freescale i.MX25 rev%d.%d%s at %s MHz\n",
- (cpurev & 0xF0) >> 4, (cpurev & 0x0F),
- ((cpurev & 0x8000) ? " unknown" : ""),
- strmhz(buf, imx_get_armclk()));
- printf("Reset cause: %s\n", get_reset_cause());
- return 0;
- }
- #endif
- #if defined(CONFIG_FEC_MXC)
- /*
- * Initializes on-chip ethernet controllers.
- * to override, implement board_eth_init()
- */
- int cpu_eth_init(bd_t *bis)
- {
- struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
- ulong val;
- val = readl(&ccm->cgr0);
- val |= (1 << 23);
- writel(val, &ccm->cgr0);
- return fecmxc_initialize(bis);
- }
- #endif
- int get_clocks(void)
- {
- #ifdef CONFIG_FSL_ESDHC_IMX
- #if CONFIG_SYS_FSL_ESDHC_ADDR == IMX_MMC_SDHC2_BASE
- gd->arch.sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
- #else
- gd->arch.sdhc_clk = mxc_get_clock(MXC_ESDHC1_CLK);
- #endif
- #endif
- return 0;
- }
- #ifdef CONFIG_FSL_ESDHC_IMX
- /*
- * Initializes on-chip MMC controllers.
- * to override, implement board_mmc_init()
- */
- int cpu_mmc_init(bd_t *bis)
- {
- return fsl_esdhc_mmc_init(bis);
- }
- #endif
- #ifdef CONFIG_FEC_MXC
- void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
- {
- int i;
- struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
- struct fuse_bank *bank = &iim->bank[0];
- struct fuse_bank0_regs *fuse =
- (struct fuse_bank0_regs *)bank->fuse_regs;
- for (i = 0; i < 6; i++)
- mac[i] = readl(&fuse->mac_addr[i]) & 0xff;
- }
- #endif /* CONFIG_FEC_MXC */
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