drivers/clk/altera/clk-agilex.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2019 Intel Corporation <www.intel.com>
  */

 #include <common.h>
 #include <asm/io.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <dm/lists.h>
 #include <dm/util.h>
 #include <dt-bindings/clock/agilex-clock.h>

 #include <asm/arch/clock_manager.h>

 DECLARE_GLOBAL_DATA_PTR;

 struct socfpga_clk_platdata {
 	void __iomem *regs;
 };

 /*
  * function to write the bypass register which requires a poll of the
  * busy bit
  */
 static void clk_write_bypass_mainpll(struct socfpga_clk_platdata *plat, u32 val)
 {
 	CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_BYPASS);
 	cm_wait_for_fsm();
 }

 static void clk_write_bypass_perpll(struct socfpga_clk_platdata *plat, u32 val)
 {
 	CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_BYPASS);
 	cm_wait_for_fsm();
 }

 /* function to write the ctrl register which requires a poll of the busy bit */
 static void clk_write_ctrl(struct socfpga_clk_platdata *plat, u32 val)
 {
 	CM_REG_WRITEL(plat, val, CLKMGR_CTRL);
 	cm_wait_for_fsm();
 }

 #define MEMBUS_MAINPLL				0
 #define MEMBUS_PERPLL				1
 #define MEMBUS_TIMEOUT				1000
 #define MEMBUS_ADDR_CLKSLICE			0x27
 #define MEMBUS_CLKSLICE_SYNC_MODE_EN		0x80

 static int membus_wait_for_req(struct socfpga_clk_platdata *plat, u32 pll,
 			       int timeout)
 {
 	int cnt = 0;
 	u32 req_status;

 	if (pll == MEMBUS_MAINPLL)
 		req_status = CM_REG_READL(plat, CLKMGR_MAINPLL_MEM);
 	else
 		req_status = CM_REG_READL(plat, CLKMGR_PERPLL_MEM);

 	while ((cnt < timeout) && (req_status & CLKMGR_MEM_REQ_SET_MSK)) {
 		if (pll == MEMBUS_MAINPLL)
 			req_status = CM_REG_READL(plat, CLKMGR_MAINPLL_MEM);
 		else
 			req_status = CM_REG_READL(plat, CLKMGR_PERPLL_MEM);
 		cnt++;
 	}

 	if (cnt >= timeout)
 		return -ETIMEDOUT;

 	return 0;
 }

 static int membus_write_pll(struct socfpga_clk_platdata *plat, u32 pll,
 			    u32 addr_offset, u32 wdat, int timeout)
 {
 	u32 addr;
 	u32 val;

 	addr = ((addr_offset | CLKMGR_MEM_ADDR_START) & CLKMGR_MEM_ADDR_MASK);

 	val = (CLKMGR_MEM_REQ_SET_MSK | CLKMGR_MEM_WR_SET_MSK |
 	       (wdat << CLKMGR_MEM_WDAT_LSB_OFFSET) | addr);

 	if (pll == MEMBUS_MAINPLL)
 		CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_MEM);
 	else
 		CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_MEM);

 	debug("MEMBUS: Write 0x%08x to addr = 0x%08x\n", wdat, addr);

 	return membus_wait_for_req(plat, pll, timeout);
 }

 static int membus_read_pll(struct socfpga_clk_platdata *plat, u32 pll,
 			   u32 addr_offset, u32 *rdata, int timeout)
 {
 	u32 addr;
 	u32 val;

 	addr = ((addr_offset | CLKMGR_MEM_ADDR_START) & CLKMGR_MEM_ADDR_MASK);

 	val = ((CLKMGR_MEM_REQ_SET_MSK & ~CLKMGR_MEM_WR_SET_MSK) | addr);

 	if (pll == MEMBUS_MAINPLL)
 		CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_MEM);
 	else
 		CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_MEM);

 	*rdata = 0;

 	if (membus_wait_for_req(plat, pll, timeout))
 		return -ETIMEDOUT;

 	if (pll == MEMBUS_MAINPLL)
 		*rdata = CM_REG_READL(plat, CLKMGR_MAINPLL_MEMSTAT);
 	else
 		*rdata = CM_REG_READL(plat, CLKMGR_PERPLL_MEMSTAT);

 	debug("MEMBUS: Read 0x%08x from addr = 0x%08x\n", *rdata, addr);

 	return 0;
 }

 static u32 calc_vocalib_pll(u32 pllm, u32 pllglob)
 {
 	u32 mdiv, refclkdiv, arefclkdiv, drefclkdiv, mscnt, hscnt, vcocalib;

 	mdiv = pllm & CLKMGR_PLLM_MDIV_MASK;
 	arefclkdiv = (pllglob & CLKMGR_PLLGLOB_AREFCLKDIV_MASK) >>
 		      CLKMGR_PLLGLOB_AREFCLKDIV_OFFSET;
 	drefclkdiv = (pllglob & CLKMGR_PLLGLOB_DREFCLKDIV_MASK) >>
 		      CLKMGR_PLLGLOB_DREFCLKDIV_OFFSET;
 	refclkdiv = (pllglob & CLKMGR_PLLGLOB_REFCLKDIV_MASK) >>
 		     CLKMGR_PLLGLOB_REFCLKDIV_OFFSET;
 	mscnt = CLKMGR_VCOCALIB_MSCNT_CONST / (mdiv * BIT(drefclkdiv));
 	if (!mscnt)
 		mscnt = 1;
 	hscnt = (mdiv * mscnt * BIT(drefclkdiv) / refclkdiv) -
 		CLKMGR_VCOCALIB_HSCNT_CONST;
 	vcocalib = (hscnt & CLKMGR_VCOCALIB_HSCNT_MASK) |
 		   ((mscnt << CLKMGR_VCOCALIB_MSCNT_OFFSET) &
 		     CLKMGR_VCOCALIB_MSCNT_MASK);

 	/* Dump all the pll calibration settings for debug purposes */
 	debug("mdiv          : %d\n", mdiv);
 	debug("arefclkdiv    : %d\n", arefclkdiv);
 	debug("drefclkdiv    : %d\n", drefclkdiv);
 	debug("refclkdiv     : %d\n", refclkdiv);
 	debug("mscnt         : %d\n", mscnt);
 	debug("hscnt         : %d\n", hscnt);
 	debug("vcocalib      : 0x%08x\n", vcocalib);

 	return vcocalib;
 }

 /*
  * Setup clocks while making no assumptions about previous state of the clocks.
  */
 static void clk_basic_init(struct udevice *dev,
 			   const struct cm_config * const cfg)
 {
 	struct socfpga_clk_platdata *plat = dev_get_platdata(dev);
 	u32 vcocalib;
 	u32 rdata;

 	if (!cfg)
 		return;

 	/* Put both PLLs in bypass */
 	clk_write_bypass_mainpll(plat, CLKMGR_BYPASS_MAINPLL_ALL);
 	clk_write_bypass_perpll(plat, CLKMGR_BYPASS_PERPLL_ALL);

 	/* Put both PLLs in Reset and Power Down */
 	CM_REG_CLRBITS(plat, CLKMGR_MAINPLL_PLLGLOB,
 		       CLKMGR_PLLGLOB_PD_MASK | CLKMGR_PLLGLOB_RST_MASK);
 	CM_REG_CLRBITS(plat, CLKMGR_PERPLL_PLLGLOB,
 		       CLKMGR_PLLGLOB_PD_MASK | CLKMGR_PLLGLOB_RST_MASK);

 	/* setup main PLL dividers where calculate the vcocalib value */
 	vcocalib = calc_vocalib_pll(cfg->main_pll_pllm, cfg->main_pll_pllglob);
 	CM_REG_WRITEL(plat, cfg->main_pll_pllglob & ~CLKMGR_PLLGLOB_RST_MASK,
 		      CLKMGR_MAINPLL_PLLGLOB);
 	CM_REG_WRITEL(plat, cfg->main_pll_fdbck, CLKMGR_MAINPLL_FDBCK);
 	CM_REG_WRITEL(plat, vcocalib, CLKMGR_MAINPLL_VCOCALIB);
 	CM_REG_WRITEL(plat, cfg->main_pll_pllc0, CLKMGR_MAINPLL_PLLC0);
 	CM_REG_WRITEL(plat, cfg->main_pll_pllc1, CLKMGR_MAINPLL_PLLC1);
 	CM_REG_WRITEL(plat, cfg->main_pll_pllc2, CLKMGR_MAINPLL_PLLC2);
 	CM_REG_WRITEL(plat, cfg->main_pll_pllc3, CLKMGR_MAINPLL_PLLC3);
 	CM_REG_WRITEL(plat, cfg->main_pll_pllm, CLKMGR_MAINPLL_PLLM);
 	CM_REG_WRITEL(plat, cfg->main_pll_mpuclk, CLKMGR_MAINPLL_MPUCLK);
 	CM_REG_WRITEL(plat, cfg->main_pll_nocclk, CLKMGR_MAINPLL_NOCCLK);
 	CM_REG_WRITEL(plat, cfg->main_pll_nocdiv, CLKMGR_MAINPLL_NOCDIV);

 	/* setup peripheral PLL dividers where calculate the vcocalib value */
 	vcocalib = calc_vocalib_pll(cfg->per_pll_pllm, cfg->per_pll_pllglob);
 	CM_REG_WRITEL(plat, cfg->per_pll_pllglob & ~CLKMGR_PLLGLOB_RST_MASK,
 		      CLKMGR_PERPLL_PLLGLOB);
 	CM_REG_WRITEL(plat, cfg->per_pll_fdbck, CLKMGR_PERPLL_FDBCK);
 	CM_REG_WRITEL(plat, vcocalib, CLKMGR_PERPLL_VCOCALIB);
 	CM_REG_WRITEL(plat, cfg->per_pll_pllc0, CLKMGR_PERPLL_PLLC0);
 	CM_REG_WRITEL(plat, cfg->per_pll_pllc1, CLKMGR_PERPLL_PLLC1);
 	CM_REG_WRITEL(plat, cfg->per_pll_pllc2, CLKMGR_PERPLL_PLLC2);
 	CM_REG_WRITEL(plat, cfg->per_pll_pllc3, CLKMGR_PERPLL_PLLC3);
 	CM_REG_WRITEL(plat, cfg->per_pll_pllm, CLKMGR_PERPLL_PLLM);
 	CM_REG_WRITEL(plat, cfg->per_pll_emacctl, CLKMGR_PERPLL_EMACCTL);
 	CM_REG_WRITEL(plat, cfg->per_pll_gpiodiv, CLKMGR_PERPLL_GPIODIV);

 	/* Take both PLL out of reset and power up */
 	CM_REG_SETBITS(plat, CLKMGR_MAINPLL_PLLGLOB,
 		       CLKMGR_PLLGLOB_PD_MASK | CLKMGR_PLLGLOB_RST_MASK);
 	CM_REG_SETBITS(plat, CLKMGR_PERPLL_PLLGLOB,
 		       CLKMGR_PLLGLOB_PD_MASK | CLKMGR_PLLGLOB_RST_MASK);

 	/* Membus programming to set mainpll and perripll to
 	 * source synchronous mode
 	 */
 	membus_read_pll(plat, MEMBUS_MAINPLL, MEMBUS_ADDR_CLKSLICE, &rdata,
 			MEMBUS_TIMEOUT);
 	membus_write_pll(plat, MEMBUS_MAINPLL, MEMBUS_ADDR_CLKSLICE,
 			 (rdata | MEMBUS_CLKSLICE_SYNC_MODE_EN),
 			 MEMBUS_TIMEOUT);
 	membus_read_pll(plat, MEMBUS_PERPLL, MEMBUS_ADDR_CLKSLICE, &rdata,
 			MEMBUS_TIMEOUT);
 	membus_write_pll(plat, MEMBUS_PERPLL, MEMBUS_ADDR_CLKSLICE,
 			 (rdata | MEMBUS_CLKSLICE_SYNC_MODE_EN),
 			 MEMBUS_TIMEOUT);

 	cm_wait_for_lock(CLKMGR_STAT_ALLPLL_LOCKED_MASK);

 	/* Configure ping pong counters in altera group */
 	CM_REG_WRITEL(plat, cfg->alt_emacactr, CLKMGR_ALTR_EMACACTR);
 	CM_REG_WRITEL(plat, cfg->alt_emacbctr, CLKMGR_ALTR_EMACBCTR);
 	CM_REG_WRITEL(plat, cfg->alt_emacptpctr, CLKMGR_ALTR_EMACPTPCTR);
 	CM_REG_WRITEL(plat, cfg->alt_gpiodbctr, CLKMGR_ALTR_GPIODBCTR);
 	CM_REG_WRITEL(plat, cfg->alt_sdmmcctr, CLKMGR_ALTR_SDMMCCTR);
 	CM_REG_WRITEL(plat, cfg->alt_s2fuser0ctr, CLKMGR_ALTR_S2FUSER0CTR);
 	CM_REG_WRITEL(plat, cfg->alt_s2fuser1ctr, CLKMGR_ALTR_S2FUSER1CTR);
 	CM_REG_WRITEL(plat, cfg->alt_psirefctr, CLKMGR_ALTR_PSIREFCTR);

 	CM_REG_WRITEL(plat, CLKMGR_LOSTLOCK_SET_MASK, CLKMGR_MAINPLL_LOSTLOCK);
 	CM_REG_WRITEL(plat, CLKMGR_LOSTLOCK_SET_MASK, CLKMGR_PERPLL_LOSTLOCK);

 	CM_REG_WRITEL(plat, CM_REG_READL(plat, CLKMGR_MAINPLL_PLLGLOB) |
 			CLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK,
 			CLKMGR_MAINPLL_PLLGLOB);
 	CM_REG_WRITEL(plat, CM_REG_READL(plat, CLKMGR_PERPLL_PLLGLOB) |
 			CLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK,
 			CLKMGR_PERPLL_PLLGLOB);

 	/* Take all PLLs out of bypass */
 	clk_write_bypass_mainpll(plat, 0);
 	clk_write_bypass_perpll(plat, 0);

 	/* Clear the loss of lock bits (write 1 to clear) */
 	CM_REG_CLRBITS(plat, CLKMGR_INTRCLR,
 		       CLKMGR_INTER_PERPLLLOST_MASK |
 		       CLKMGR_INTER_MAINPLLLOST_MASK);

 	/* Take all ping pong counters out of reset */
 	CM_REG_CLRBITS(plat, CLKMGR_ALTR_EXTCNTRST,
 		       CLKMGR_ALT_EXTCNTRST_ALLCNTRST);

 	/* Out of boot mode */
 	clk_write_ctrl(plat,
 		       CM_REG_READL(plat, CLKMGR_CTRL) & ~CLKMGR_CTRL_BOOTMODE);
 }

 static u64 clk_get_vco_clk_hz(struct socfpga_clk_platdata *plat,
 			      u32 pllglob_reg, u32 pllm_reg)
 {
 	 u64 fref, arefdiv, mdiv, reg, vco;

 	reg = CM_REG_READL(plat, pllglob_reg);

 	fref = (reg & CLKMGR_PLLGLOB_VCO_PSRC_MASK) >>
 		CLKMGR_PLLGLOB_VCO_PSRC_OFFSET;

 	switch (fref) {
 	case CLKMGR_VCO_PSRC_EOSC1:
 		fref = cm_get_osc_clk_hz();
 		break;
 	case CLKMGR_VCO_PSRC_INTOSC:
 		fref = cm_get_intosc_clk_hz();
 		break;
 	case CLKMGR_VCO_PSRC_F2S:
 		fref = cm_get_fpga_clk_hz();
 		break;
 	}

 	arefdiv = (reg & CLKMGR_PLLGLOB_AREFCLKDIV_MASK) >>
 		   CLKMGR_PLLGLOB_AREFCLKDIV_OFFSET;

 	mdiv = CM_REG_READL(plat, pllm_reg) & CLKMGR_PLLM_MDIV_MASK;

 	vco = fref / arefdiv;
 	vco = vco * mdiv;

 	return vco;
 }

 static u64 clk_get_main_vco_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	return clk_get_vco_clk_hz(plat, CLKMGR_MAINPLL_PLLGLOB,
 				 CLKMGR_MAINPLL_PLLM);
 }

 static u64 clk_get_per_vco_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	return clk_get_vco_clk_hz(plat, CLKMGR_PERPLL_PLLGLOB,
 				 CLKMGR_PERPLL_PLLM);
 }

 static u32 clk_get_5_1_clk_src(struct socfpga_clk_platdata *plat, u64 reg)
 {
 	u32 clksrc = CM_REG_READL(plat, reg);

 	return (clksrc & CLKMGR_CLKSRC_MASK) >> CLKMGR_CLKSRC_OFFSET;
 }

 static u64 clk_get_clksrc_hz(struct socfpga_clk_platdata *plat, u32 clksrc_reg,
 			     u32 main_reg, u32 per_reg)
 {
 	u64 clock;
 	u32 clklsrc = clk_get_5_1_clk_src(plat, clksrc_reg);

 	switch (clklsrc) {
 	case CLKMGR_CLKSRC_MAIN:
 		clock = clk_get_main_vco_clk_hz(plat);
 		clock /= (CM_REG_READL(plat, main_reg) &
 			  CLKMGR_CLKCNT_MSK);
 		break;

 	case CLKMGR_CLKSRC_PER:
 		clock = clk_get_per_vco_clk_hz(plat);
 		clock /= (CM_REG_READL(plat, per_reg) &
 			  CLKMGR_CLKCNT_MSK);
 		break;

 	case CLKMGR_CLKSRC_OSC1:
 		clock = cm_get_osc_clk_hz();
 		break;

 	case CLKMGR_CLKSRC_INTOSC:
 		clock = cm_get_intosc_clk_hz();
 		break;

 	case CLKMGR_CLKSRC_FPGA:
 		clock = cm_get_fpga_clk_hz();
 		break;
 	default:
 		return 0;
 	}

 	return clock;
 }

 static u64 clk_get_mpu_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	u64 clock = clk_get_clksrc_hz(plat, CLKMGR_MAINPLL_MPUCLK,
 				      CLKMGR_MAINPLL_PLLC0,
 				      CLKMGR_PERPLL_PLLC0);

 	clock /= 1 + (CM_REG_READL(plat, CLKMGR_MAINPLL_MPUCLK) &
 		 CLKMGR_CLKCNT_MSK);

 	return clock;
 }

 static u32 clk_get_l3_main_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	return clk_get_clksrc_hz(plat, CLKMGR_MAINPLL_NOCCLK,
 				      CLKMGR_MAINPLL_PLLC1,
 				      CLKMGR_PERPLL_PLLC1);
 }

 static u32 clk_get_l4_main_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	u64 clock = clk_get_l3_main_clk_hz(plat);

 	clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >>
 	      CLKMGR_NOCDIV_L4MAIN_OFFSET) &
 	      CLKMGR_NOCDIV_DIVIDER_MASK);

 	return clock;
 }

 static u32 clk_get_sdmmc_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	u64 clock = clk_get_clksrc_hz(plat, CLKMGR_ALTR_SDMMCCTR,
 				      CLKMGR_MAINPLL_PLLC3,
 				      CLKMGR_PERPLL_PLLC3);

 	clock /= 1 + (CM_REG_READL(plat, CLKMGR_ALTR_SDMMCCTR) &
 		 CLKMGR_CLKCNT_MSK);

 	return clock / 4;
 }

 static u32 clk_get_l4_sp_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	u64 clock = clk_get_l3_main_clk_hz(plat);

 	clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >>
 		      CLKMGR_NOCDIV_L4SPCLK_OFFSET) &
 		      CLKMGR_NOCDIV_DIVIDER_MASK);

 	return clock;
 }

 static u32 clk_get_l4_mp_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	u64 clock = clk_get_l3_main_clk_hz(plat);

 	clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >>
 		      CLKMGR_NOCDIV_L4MPCLK_OFFSET) &
 		      CLKMGR_NOCDIV_DIVIDER_MASK);

 	return clock;
 }

 static u32 clk_get_l4_sys_free_clk_hz(struct socfpga_clk_platdata *plat)
 {
 	if (CM_REG_READL(plat, CLKMGR_STAT) & CLKMGR_STAT_BOOTMODE)
 		return clk_get_l3_main_clk_hz(plat) / 2;

 	return clk_get_l3_main_clk_hz(plat) / 4;
 }

 static u32 clk_get_emac_clk_hz(struct socfpga_clk_platdata *plat, u32 emac_id)
 {
 	bool emacsel_a;
 	u32 ctl;
 	u32 ctr_reg;
 	u32 clock;
 	u32 div;
 	u32 reg;

 	/* Get EMAC clock source */
 	ctl = CM_REG_READL(plat, CLKMGR_PERPLL_EMACCTL);
 	if (emac_id == AGILEX_EMAC0_CLK)
 		ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC0SELB_OFFSET) &
 		       CLKMGR_PERPLLGRP_EMACCTL_EMAC0SELB_MASK;
 	else if (emac_id == AGILEX_EMAC1_CLK)
 		ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC1SELB_OFFSET) &
 		       CLKMGR_PERPLLGRP_EMACCTL_EMAC1SELB_MASK;
 	else if (emac_id == AGILEX_EMAC2_CLK)
 		ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC2SELB_OFFSET) &
 		       CLKMGR_PERPLLGRP_EMACCTL_EMAC2SELB_MASK;
 	else
 		return 0;

 	if (ctl) {
 		/* EMAC B source */
 		emacsel_a = false;
 		ctr_reg = CLKMGR_ALTR_EMACBCTR;
 	} else {
 		/* EMAC A source */
 		emacsel_a = true;
 		ctr_reg = CLKMGR_ALTR_EMACACTR;
 	}

 	reg = CM_REG_READL(plat, ctr_reg);
 	clock = (reg & CLKMGR_ALT_EMACCTR_SRC_MASK)
 		 >> CLKMGR_ALT_EMACCTR_SRC_OFFSET;
 	div = (reg & CLKMGR_ALT_EMACCTR_CNT_MASK)
 		>> CLKMGR_ALT_EMACCTR_CNT_OFFSET;

 	switch (clock) {
 	case CLKMGR_CLKSRC_MAIN:
 		clock = clk_get_main_vco_clk_hz(plat);
 		if (emacsel_a) {
 			clock /= (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLC2) &
 				  CLKMGR_CLKCNT_MSK);
 		} else {
 			clock /= (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLC3) &
 				  CLKMGR_CLKCNT_MSK);
 		}
 		break;

 	case CLKMGR_CLKSRC_PER:
 		clock = clk_get_per_vco_clk_hz(plat);
 		if (emacsel_a) {
 			clock /= (CM_REG_READL(plat, CLKMGR_PERPLL_PLLC2) &
 				  CLKMGR_CLKCNT_MSK);
 		} else {
 			clock /= (CM_REG_READL(plat, CLKMGR_PERPLL_PLLC3) &
 				  CLKMGR_CLKCNT_MSK);
 		}
 		break;

 	case CLKMGR_CLKSRC_OSC1:
 		clock = cm_get_osc_clk_hz();
 		break;

 	case CLKMGR_CLKSRC_INTOSC:
 		clock = cm_get_intosc_clk_hz();
 		break;

 	case CLKMGR_CLKSRC_FPGA:
 		clock = cm_get_fpga_clk_hz();
 		break;
 	}

 	clock /= 1 + div;

 	return clock;
 }

 static ulong socfpga_clk_get_rate(struct clk *clk)
 {
 	struct socfpga_clk_platdata *plat = dev_get_platdata(clk->dev);

 	switch (clk->id) {
 	case AGILEX_MPU_CLK:
 		return clk_get_mpu_clk_hz(plat);
 	case AGILEX_L4_MAIN_CLK:
 		return clk_get_l4_main_clk_hz(plat);
 	case AGILEX_L4_SYS_FREE_CLK:
 		return clk_get_l4_sys_free_clk_hz(plat);
 	case AGILEX_L4_MP_CLK:
 		return clk_get_l4_mp_clk_hz(plat);
 	case AGILEX_L4_SP_CLK:
 		return clk_get_l4_sp_clk_hz(plat);
 	case AGILEX_SDMMC_CLK:
 		return clk_get_sdmmc_clk_hz(plat);
 	case AGILEX_EMAC0_CLK:
 	case AGILEX_EMAC1_CLK:
 	case AGILEX_EMAC2_CLK:
 		return clk_get_emac_clk_hz(plat, clk->id);
 	case AGILEX_USB_CLK:
 		return clk_get_l4_mp_clk_hz(plat);
 	default:
 		return -ENXIO;
 	}
 }

 static int socfpga_clk_probe(struct udevice *dev)
 {
 	const struct cm_config *cm_default_cfg = cm_get_default_config();

 	clk_basic_init(dev, cm_default_cfg);

 	return 0;
 }

 static int socfpga_clk_ofdata_to_platdata(struct udevice *dev)
 {
 	struct socfpga_clk_platdata *plat = dev_get_platdata(dev);
 	fdt_addr_t addr;

 	addr = devfdt_get_addr(dev);
 	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;
 	plat->regs = (void __iomem *)addr;

 	return 0;
 }

 static struct clk_ops socfpga_clk_ops = {
 	.get_rate	= socfpga_clk_get_rate,
 };

 static const struct udevice_id socfpga_clk_match[] = {
 	{ .compatible = "intel,agilex-clkmgr" },
 	{}
 };

 U_BOOT_DRIVER(socfpga_agilex_clk) = {
 	.name		= "clk-agilex",
 	.id		= UCLASS_CLK,
 	.of_match	= socfpga_clk_match,
 	.ops		= &socfpga_clk_ops,
 	.probe		= socfpga_clk_probe,
 	.ofdata_to_platdata = socfpga_clk_ofdata_to_platdata,
 	.platdata_auto_alloc_size = sizeof(struct socfpga_clk_platdata),
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2019 Intel Corporation <www.intel.com>
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <clk-uclass.h>
	#include <dm.h>
	#include <dm/lists.h>
	#include <dm/util.h>
	#include <dt-bindings/clock/agilex-clock.h>

	#include <asm/arch/clock_manager.h>

	DECLARE_GLOBAL_DATA_PTR;

	struct socfpga_clk_platdata {
	void __iomem *regs;
	};

	/*
	* function to write the bypass register which requires a poll of the
	* busy bit
	*/
	static void clk_write_bypass_mainpll(struct socfpga_clk_platdata *plat, u32 val)
	{
	CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_BYPASS);
	cm_wait_for_fsm();
	}

	static void clk_write_bypass_perpll(struct socfpga_clk_platdata *plat, u32 val)
	{
	CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_BYPASS);
	cm_wait_for_fsm();
	}

	/* function to write the ctrl register which requires a poll of the busy bit */
	static void clk_write_ctrl(struct socfpga_clk_platdata *plat, u32 val)
	{
	CM_REG_WRITEL(plat, val, CLKMGR_CTRL);
	cm_wait_for_fsm();
	}

	#define MEMBUS_MAINPLL 0
	#define MEMBUS_PERPLL 1
	#define MEMBUS_TIMEOUT 1000
	#define MEMBUS_ADDR_CLKSLICE 0x27
	#define MEMBUS_CLKSLICE_SYNC_MODE_EN 0x80

	static int membus_wait_for_req(struct socfpga_clk_platdata *plat, u32 pll,
	int timeout)
	{
	int cnt = 0;
	u32 req_status;

	if (pll == MEMBUS_MAINPLL)
	req_status = CM_REG_READL(plat, CLKMGR_MAINPLL_MEM);
	else
	req_status = CM_REG_READL(plat, CLKMGR_PERPLL_MEM);

	while ((cnt < timeout) && (req_status & CLKMGR_MEM_REQ_SET_MSK)) {
	if (pll == MEMBUS_MAINPLL)
	req_status = CM_REG_READL(plat, CLKMGR_MAINPLL_MEM);
	else
	req_status = CM_REG_READL(plat, CLKMGR_PERPLL_MEM);
	cnt++;
	}

	if (cnt >= timeout)
	return -ETIMEDOUT;

	return 0;
	}

	static int membus_write_pll(struct socfpga_clk_platdata *plat, u32 pll,
	u32 addr_offset, u32 wdat, int timeout)
	{
	u32 addr;
	u32 val;

	addr = ((addr_offset \| CLKMGR_MEM_ADDR_START) & CLKMGR_MEM_ADDR_MASK);

	val = (CLKMGR_MEM_REQ_SET_MSK \| CLKMGR_MEM_WR_SET_MSK \|
	(wdat << CLKMGR_MEM_WDAT_LSB_OFFSET) \| addr);

	if (pll == MEMBUS_MAINPLL)
	CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_MEM);
	else
	CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_MEM);

	debug("MEMBUS: Write 0x%08x to addr = 0x%08x\n", wdat, addr);

	return membus_wait_for_req(plat, pll, timeout);
	}

	static int membus_read_pll(struct socfpga_clk_platdata *plat, u32 pll,
	u32 addr_offset, u32 *rdata, int timeout)
	{
	u32 addr;
	u32 val;

	addr = ((addr_offset \| CLKMGR_MEM_ADDR_START) & CLKMGR_MEM_ADDR_MASK);

	val = ((CLKMGR_MEM_REQ_SET_MSK & ~CLKMGR_MEM_WR_SET_MSK) \| addr);

	if (pll == MEMBUS_MAINPLL)
	CM_REG_WRITEL(plat, val, CLKMGR_MAINPLL_MEM);
	else
	CM_REG_WRITEL(plat, val, CLKMGR_PERPLL_MEM);

	*rdata = 0;

	if (membus_wait_for_req(plat, pll, timeout))
	return -ETIMEDOUT;

	if (pll == MEMBUS_MAINPLL)
	*rdata = CM_REG_READL(plat, CLKMGR_MAINPLL_MEMSTAT);
	else
	*rdata = CM_REG_READL(plat, CLKMGR_PERPLL_MEMSTAT);

	debug("MEMBUS: Read 0x%08x from addr = 0x%08x\n", *rdata, addr);

	return 0;
	}

	static u32 calc_vocalib_pll(u32 pllm, u32 pllglob)
	{
	u32 mdiv, refclkdiv, arefclkdiv, drefclkdiv, mscnt, hscnt, vcocalib;

	mdiv = pllm & CLKMGR_PLLM_MDIV_MASK;
	arefclkdiv = (pllglob & CLKMGR_PLLGLOB_AREFCLKDIV_MASK) >>
	CLKMGR_PLLGLOB_AREFCLKDIV_OFFSET;
	drefclkdiv = (pllglob & CLKMGR_PLLGLOB_DREFCLKDIV_MASK) >>
	CLKMGR_PLLGLOB_DREFCLKDIV_OFFSET;
	refclkdiv = (pllglob & CLKMGR_PLLGLOB_REFCLKDIV_MASK) >>
	CLKMGR_PLLGLOB_REFCLKDIV_OFFSET;
	mscnt = CLKMGR_VCOCALIB_MSCNT_CONST / (mdiv * BIT(drefclkdiv));
	if (!mscnt)
	mscnt = 1;
	hscnt = (mdiv * mscnt * BIT(drefclkdiv) / refclkdiv) -
	CLKMGR_VCOCALIB_HSCNT_CONST;
	vcocalib = (hscnt & CLKMGR_VCOCALIB_HSCNT_MASK) \|
	((mscnt << CLKMGR_VCOCALIB_MSCNT_OFFSET) &
	CLKMGR_VCOCALIB_MSCNT_MASK);

	/* Dump all the pll calibration settings for debug purposes */
	debug("mdiv : %d\n", mdiv);
	debug("arefclkdiv : %d\n", arefclkdiv);
	debug("drefclkdiv : %d\n", drefclkdiv);
	debug("refclkdiv : %d\n", refclkdiv);
	debug("mscnt : %d\n", mscnt);
	debug("hscnt : %d\n", hscnt);
	debug("vcocalib : 0x%08x\n", vcocalib);

	return vcocalib;
	}

	/*
	* Setup clocks while making no assumptions about previous state of the clocks.
	*/
	static void clk_basic_init(struct udevice *dev,
	const struct cm_config * const cfg)
	{
	struct socfpga_clk_platdata *plat = dev_get_platdata(dev);
	u32 vcocalib;
	u32 rdata;

	if (!cfg)
	return;

	/* Put both PLLs in bypass */
	clk_write_bypass_mainpll(plat, CLKMGR_BYPASS_MAINPLL_ALL);
	clk_write_bypass_perpll(plat, CLKMGR_BYPASS_PERPLL_ALL);

	/* Put both PLLs in Reset and Power Down */
	CM_REG_CLRBITS(plat, CLKMGR_MAINPLL_PLLGLOB,
	CLKMGR_PLLGLOB_PD_MASK \| CLKMGR_PLLGLOB_RST_MASK);
	CM_REG_CLRBITS(plat, CLKMGR_PERPLL_PLLGLOB,
	CLKMGR_PLLGLOB_PD_MASK \| CLKMGR_PLLGLOB_RST_MASK);

	/* setup main PLL dividers where calculate the vcocalib value */
	vcocalib = calc_vocalib_pll(cfg->main_pll_pllm, cfg->main_pll_pllglob);
	CM_REG_WRITEL(plat, cfg->main_pll_pllglob & ~CLKMGR_PLLGLOB_RST_MASK,
	CLKMGR_MAINPLL_PLLGLOB);
	CM_REG_WRITEL(plat, cfg->main_pll_fdbck, CLKMGR_MAINPLL_FDBCK);
	CM_REG_WRITEL(plat, vcocalib, CLKMGR_MAINPLL_VCOCALIB);
	CM_REG_WRITEL(plat, cfg->main_pll_pllc0, CLKMGR_MAINPLL_PLLC0);
	CM_REG_WRITEL(plat, cfg->main_pll_pllc1, CLKMGR_MAINPLL_PLLC1);
	CM_REG_WRITEL(plat, cfg->main_pll_pllc2, CLKMGR_MAINPLL_PLLC2);
	CM_REG_WRITEL(plat, cfg->main_pll_pllc3, CLKMGR_MAINPLL_PLLC3);
	CM_REG_WRITEL(plat, cfg->main_pll_pllm, CLKMGR_MAINPLL_PLLM);
	CM_REG_WRITEL(plat, cfg->main_pll_mpuclk, CLKMGR_MAINPLL_MPUCLK);
	CM_REG_WRITEL(plat, cfg->main_pll_nocclk, CLKMGR_MAINPLL_NOCCLK);
	CM_REG_WRITEL(plat, cfg->main_pll_nocdiv, CLKMGR_MAINPLL_NOCDIV);

	/* setup peripheral PLL dividers where calculate the vcocalib value */
	vcocalib = calc_vocalib_pll(cfg->per_pll_pllm, cfg->per_pll_pllglob);
	CM_REG_WRITEL(plat, cfg->per_pll_pllglob & ~CLKMGR_PLLGLOB_RST_MASK,
	CLKMGR_PERPLL_PLLGLOB);
	CM_REG_WRITEL(plat, cfg->per_pll_fdbck, CLKMGR_PERPLL_FDBCK);
	CM_REG_WRITEL(plat, vcocalib, CLKMGR_PERPLL_VCOCALIB);
	CM_REG_WRITEL(plat, cfg->per_pll_pllc0, CLKMGR_PERPLL_PLLC0);
	CM_REG_WRITEL(plat, cfg->per_pll_pllc1, CLKMGR_PERPLL_PLLC1);
	CM_REG_WRITEL(plat, cfg->per_pll_pllc2, CLKMGR_PERPLL_PLLC2);
	CM_REG_WRITEL(plat, cfg->per_pll_pllc3, CLKMGR_PERPLL_PLLC3);
	CM_REG_WRITEL(plat, cfg->per_pll_pllm, CLKMGR_PERPLL_PLLM);
	CM_REG_WRITEL(plat, cfg->per_pll_emacctl, CLKMGR_PERPLL_EMACCTL);
	CM_REG_WRITEL(plat, cfg->per_pll_gpiodiv, CLKMGR_PERPLL_GPIODIV);

	/* Take both PLL out of reset and power up */
	CM_REG_SETBITS(plat, CLKMGR_MAINPLL_PLLGLOB,
	CLKMGR_PLLGLOB_PD_MASK \| CLKMGR_PLLGLOB_RST_MASK);
	CM_REG_SETBITS(plat, CLKMGR_PERPLL_PLLGLOB,
	CLKMGR_PLLGLOB_PD_MASK \| CLKMGR_PLLGLOB_RST_MASK);

	/* Membus programming to set mainpll and perripll to
	* source synchronous mode
	*/
	membus_read_pll(plat, MEMBUS_MAINPLL, MEMBUS_ADDR_CLKSLICE, &rdata,
	MEMBUS_TIMEOUT);
	membus_write_pll(plat, MEMBUS_MAINPLL, MEMBUS_ADDR_CLKSLICE,
	(rdata \| MEMBUS_CLKSLICE_SYNC_MODE_EN),
	MEMBUS_TIMEOUT);
	membus_read_pll(plat, MEMBUS_PERPLL, MEMBUS_ADDR_CLKSLICE, &rdata,
	MEMBUS_TIMEOUT);
	membus_write_pll(plat, MEMBUS_PERPLL, MEMBUS_ADDR_CLKSLICE,
	(rdata \| MEMBUS_CLKSLICE_SYNC_MODE_EN),
	MEMBUS_TIMEOUT);

	cm_wait_for_lock(CLKMGR_STAT_ALLPLL_LOCKED_MASK);

	/* Configure ping pong counters in altera group */
	CM_REG_WRITEL(plat, cfg->alt_emacactr, CLKMGR_ALTR_EMACACTR);
	CM_REG_WRITEL(plat, cfg->alt_emacbctr, CLKMGR_ALTR_EMACBCTR);
	CM_REG_WRITEL(plat, cfg->alt_emacptpctr, CLKMGR_ALTR_EMACPTPCTR);
	CM_REG_WRITEL(plat, cfg->alt_gpiodbctr, CLKMGR_ALTR_GPIODBCTR);
	CM_REG_WRITEL(plat, cfg->alt_sdmmcctr, CLKMGR_ALTR_SDMMCCTR);
	CM_REG_WRITEL(plat, cfg->alt_s2fuser0ctr, CLKMGR_ALTR_S2FUSER0CTR);
	CM_REG_WRITEL(plat, cfg->alt_s2fuser1ctr, CLKMGR_ALTR_S2FUSER1CTR);
	CM_REG_WRITEL(plat, cfg->alt_psirefctr, CLKMGR_ALTR_PSIREFCTR);

	CM_REG_WRITEL(plat, CLKMGR_LOSTLOCK_SET_MASK, CLKMGR_MAINPLL_LOSTLOCK);
	CM_REG_WRITEL(plat, CLKMGR_LOSTLOCK_SET_MASK, CLKMGR_PERPLL_LOSTLOCK);

	CM_REG_WRITEL(plat, CM_REG_READL(plat, CLKMGR_MAINPLL_PLLGLOB) \|
	CLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK,
	CLKMGR_MAINPLL_PLLGLOB);
	CM_REG_WRITEL(plat, CM_REG_READL(plat, CLKMGR_PERPLL_PLLGLOB) \|
	CLKMGR_PLLGLOB_CLR_LOSTLOCK_BYPASS_MASK,
	CLKMGR_PERPLL_PLLGLOB);

	/* Take all PLLs out of bypass */
	clk_write_bypass_mainpll(plat, 0);
	clk_write_bypass_perpll(plat, 0);

	/* Clear the loss of lock bits (write 1 to clear) */
	CM_REG_CLRBITS(plat, CLKMGR_INTRCLR,
	CLKMGR_INTER_PERPLLLOST_MASK \|
	CLKMGR_INTER_MAINPLLLOST_MASK);

	/* Take all ping pong counters out of reset */
	CM_REG_CLRBITS(plat, CLKMGR_ALTR_EXTCNTRST,
	CLKMGR_ALT_EXTCNTRST_ALLCNTRST);

	/* Out of boot mode */
	clk_write_ctrl(plat,
	CM_REG_READL(plat, CLKMGR_CTRL) & ~CLKMGR_CTRL_BOOTMODE);
	}

	static u64 clk_get_vco_clk_hz(struct socfpga_clk_platdata *plat,
	u32 pllglob_reg, u32 pllm_reg)
	{
	u64 fref, arefdiv, mdiv, reg, vco;

	reg = CM_REG_READL(plat, pllglob_reg);

	fref = (reg & CLKMGR_PLLGLOB_VCO_PSRC_MASK) >>
	CLKMGR_PLLGLOB_VCO_PSRC_OFFSET;

	switch (fref) {
	case CLKMGR_VCO_PSRC_EOSC1:
	fref = cm_get_osc_clk_hz();
	break;
	case CLKMGR_VCO_PSRC_INTOSC:
	fref = cm_get_intosc_clk_hz();
	break;
	case CLKMGR_VCO_PSRC_F2S:
	fref = cm_get_fpga_clk_hz();
	break;
	}

	arefdiv = (reg & CLKMGR_PLLGLOB_AREFCLKDIV_MASK) >>
	CLKMGR_PLLGLOB_AREFCLKDIV_OFFSET;

	mdiv = CM_REG_READL(plat, pllm_reg) & CLKMGR_PLLM_MDIV_MASK;

	vco = fref / arefdiv;
	vco = vco * mdiv;

	return vco;
	}

	static u64 clk_get_main_vco_clk_hz(struct socfpga_clk_platdata *plat)
	{
	return clk_get_vco_clk_hz(plat, CLKMGR_MAINPLL_PLLGLOB,
	CLKMGR_MAINPLL_PLLM);
	}

	static u64 clk_get_per_vco_clk_hz(struct socfpga_clk_platdata *plat)
	{
	return clk_get_vco_clk_hz(plat, CLKMGR_PERPLL_PLLGLOB,
	CLKMGR_PERPLL_PLLM);
	}

	static u32 clk_get_5_1_clk_src(struct socfpga_clk_platdata *plat, u64 reg)
	{
	u32 clksrc = CM_REG_READL(plat, reg);

	return (clksrc & CLKMGR_CLKSRC_MASK) >> CLKMGR_CLKSRC_OFFSET;
	}

	static u64 clk_get_clksrc_hz(struct socfpga_clk_platdata *plat, u32 clksrc_reg,
	u32 main_reg, u32 per_reg)
	{
	u64 clock;
	u32 clklsrc = clk_get_5_1_clk_src(plat, clksrc_reg);

	switch (clklsrc) {
	case CLKMGR_CLKSRC_MAIN:
	clock = clk_get_main_vco_clk_hz(plat);
	clock /= (CM_REG_READL(plat, main_reg) &
	CLKMGR_CLKCNT_MSK);
	break;

	case CLKMGR_CLKSRC_PER:
	clock = clk_get_per_vco_clk_hz(plat);
	clock /= (CM_REG_READL(plat, per_reg) &
	CLKMGR_CLKCNT_MSK);
	break;

	case CLKMGR_CLKSRC_OSC1:
	clock = cm_get_osc_clk_hz();
	break;

	case CLKMGR_CLKSRC_INTOSC:
	clock = cm_get_intosc_clk_hz();
	break;

	case CLKMGR_CLKSRC_FPGA:
	clock = cm_get_fpga_clk_hz();
	break;
	default:
	return 0;
	}

	return clock;
	}

	static u64 clk_get_mpu_clk_hz(struct socfpga_clk_platdata *plat)
	{
	u64 clock = clk_get_clksrc_hz(plat, CLKMGR_MAINPLL_MPUCLK,
	CLKMGR_MAINPLL_PLLC0,
	CLKMGR_PERPLL_PLLC0);

	clock /= 1 + (CM_REG_READL(plat, CLKMGR_MAINPLL_MPUCLK) &
	CLKMGR_CLKCNT_MSK);

	return clock;
	}

	static u32 clk_get_l3_main_clk_hz(struct socfpga_clk_platdata *plat)
	{
	return clk_get_clksrc_hz(plat, CLKMGR_MAINPLL_NOCCLK,
	CLKMGR_MAINPLL_PLLC1,
	CLKMGR_PERPLL_PLLC1);
	}

	static u32 clk_get_l4_main_clk_hz(struct socfpga_clk_platdata *plat)
	{
	u64 clock = clk_get_l3_main_clk_hz(plat);

	clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >>
	CLKMGR_NOCDIV_L4MAIN_OFFSET) &
	CLKMGR_NOCDIV_DIVIDER_MASK);

	return clock;
	}

	static u32 clk_get_sdmmc_clk_hz(struct socfpga_clk_platdata *plat)
	{
	u64 clock = clk_get_clksrc_hz(plat, CLKMGR_ALTR_SDMMCCTR,
	CLKMGR_MAINPLL_PLLC3,
	CLKMGR_PERPLL_PLLC3);

	clock /= 1 + (CM_REG_READL(plat, CLKMGR_ALTR_SDMMCCTR) &
	CLKMGR_CLKCNT_MSK);

	return clock / 4;
	}

	static u32 clk_get_l4_sp_clk_hz(struct socfpga_clk_platdata *plat)
	{
	u64 clock = clk_get_l3_main_clk_hz(plat);

	clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >>
	CLKMGR_NOCDIV_L4SPCLK_OFFSET) &
	CLKMGR_NOCDIV_DIVIDER_MASK);

	return clock;
	}

	static u32 clk_get_l4_mp_clk_hz(struct socfpga_clk_platdata *plat)
	{
	u64 clock = clk_get_l3_main_clk_hz(plat);

	clock /= BIT((CM_REG_READL(plat, CLKMGR_MAINPLL_NOCDIV) >>
	CLKMGR_NOCDIV_L4MPCLK_OFFSET) &
	CLKMGR_NOCDIV_DIVIDER_MASK);

	return clock;
	}

	static u32 clk_get_l4_sys_free_clk_hz(struct socfpga_clk_platdata *plat)
	{
	if (CM_REG_READL(plat, CLKMGR_STAT) & CLKMGR_STAT_BOOTMODE)
	return clk_get_l3_main_clk_hz(plat) / 2;

	return clk_get_l3_main_clk_hz(plat) / 4;
	}

	static u32 clk_get_emac_clk_hz(struct socfpga_clk_platdata *plat, u32 emac_id)
	{
	bool emacsel_a;
	u32 ctl;
	u32 ctr_reg;
	u32 clock;
	u32 div;
	u32 reg;

	/* Get EMAC clock source */
	ctl = CM_REG_READL(plat, CLKMGR_PERPLL_EMACCTL);
	if (emac_id == AGILEX_EMAC0_CLK)
	ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC0SELB_OFFSET) &
	CLKMGR_PERPLLGRP_EMACCTL_EMAC0SELB_MASK;
	else if (emac_id == AGILEX_EMAC1_CLK)
	ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC1SELB_OFFSET) &
	CLKMGR_PERPLLGRP_EMACCTL_EMAC1SELB_MASK;
	else if (emac_id == AGILEX_EMAC2_CLK)
	ctl = (ctl >> CLKMGR_PERPLLGRP_EMACCTL_EMAC2SELB_OFFSET) &
	CLKMGR_PERPLLGRP_EMACCTL_EMAC2SELB_MASK;
	else
	return 0;

	if (ctl) {
	/* EMAC B source */
	emacsel_a = false;
	ctr_reg = CLKMGR_ALTR_EMACBCTR;
	} else {
	/* EMAC A source */
	emacsel_a = true;
	ctr_reg = CLKMGR_ALTR_EMACACTR;
	}

	reg = CM_REG_READL(plat, ctr_reg);
	clock = (reg & CLKMGR_ALT_EMACCTR_SRC_MASK)
	>> CLKMGR_ALT_EMACCTR_SRC_OFFSET;
	div = (reg & CLKMGR_ALT_EMACCTR_CNT_MASK)
	>> CLKMGR_ALT_EMACCTR_CNT_OFFSET;

	switch (clock) {
	case CLKMGR_CLKSRC_MAIN:
	clock = clk_get_main_vco_clk_hz(plat);
	if (emacsel_a) {
	clock /= (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLC2) &
	CLKMGR_CLKCNT_MSK);
	} else {
	clock /= (CM_REG_READL(plat, CLKMGR_MAINPLL_PLLC3) &
	CLKMGR_CLKCNT_MSK);
	}
	break;

	case CLKMGR_CLKSRC_PER:
	clock = clk_get_per_vco_clk_hz(plat);
	if (emacsel_a) {
	clock /= (CM_REG_READL(plat, CLKMGR_PERPLL_PLLC2) &
	CLKMGR_CLKCNT_MSK);
	} else {
	clock /= (CM_REG_READL(plat, CLKMGR_PERPLL_PLLC3) &
	CLKMGR_CLKCNT_MSK);
	}
	break;

	case CLKMGR_CLKSRC_OSC1:
	clock = cm_get_osc_clk_hz();
	break;

	case CLKMGR_CLKSRC_INTOSC:
	clock = cm_get_intosc_clk_hz();
	break;

	case CLKMGR_CLKSRC_FPGA:
	clock = cm_get_fpga_clk_hz();
	break;
	}

	clock /= 1 + div;

	return clock;
	}

	static ulong socfpga_clk_get_rate(struct clk *clk)
	{
	struct socfpga_clk_platdata *plat = dev_get_platdata(clk->dev);

	switch (clk->id) {
	case AGILEX_MPU_CLK:
	return clk_get_mpu_clk_hz(plat);
	case AGILEX_L4_MAIN_CLK:
	return clk_get_l4_main_clk_hz(plat);
	case AGILEX_L4_SYS_FREE_CLK:
	return clk_get_l4_sys_free_clk_hz(plat);
	case AGILEX_L4_MP_CLK:
	return clk_get_l4_mp_clk_hz(plat);
	case AGILEX_L4_SP_CLK:
	return clk_get_l4_sp_clk_hz(plat);
	case AGILEX_SDMMC_CLK:
	return clk_get_sdmmc_clk_hz(plat);
	case AGILEX_EMAC0_CLK:
	case AGILEX_EMAC1_CLK:
	case AGILEX_EMAC2_CLK:
	return clk_get_emac_clk_hz(plat, clk->id);
	case AGILEX_USB_CLK:
	return clk_get_l4_mp_clk_hz(plat);
	default:
	return -ENXIO;
	}
	}

	static int socfpga_clk_probe(struct udevice *dev)
	{
	const struct cm_config *cm_default_cfg = cm_get_default_config();

	clk_basic_init(dev, cm_default_cfg);

	return 0;
	}

	static int socfpga_clk_ofdata_to_platdata(struct udevice *dev)
	{
	struct socfpga_clk_platdata *plat = dev_get_platdata(dev);
	fdt_addr_t addr;

	addr = devfdt_get_addr(dev);
	if (addr == FDT_ADDR_T_NONE)
	return -EINVAL;
	plat->regs = (void __iomem *)addr;

	return 0;
	}

	static struct clk_ops socfpga_clk_ops = {
	.get_rate = socfpga_clk_get_rate,
	};

	static const struct udevice_id socfpga_clk_match[] = {
	{ .compatible = "intel,agilex-clkmgr" },
	{}
	};

	U_BOOT_DRIVER(socfpga_agilex_clk) = {
	.name = "clk-agilex",
	.id = UCLASS_CLK,
	.of_match = socfpga_clk_match,
	.ops = &socfpga_clk_ops,
	.probe = socfpga_clk_probe,
	.ofdata_to_platdata = socfpga_clk_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct socfpga_clk_platdata),
	};