drivers/clk/clk_zynq.c - u-boot-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2017 Weidmüller Interface GmbH & Co. KG
  * Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
  *
  * Copyright (C) 2013 Soren Brinkmann <soren.brinkmann@xilinx.com>
  * Copyright (C) 2013 Xilinx, Inc. All rights reserved.
  */

 #include <common.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <dm/lists.h>
 #include <errno.h>
 #include <asm/io.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/sys_proto.h>

 /* Register bitfield defines */
 #define PLLCTRL_FBDIV_MASK	0x7f000
 #define PLLCTRL_FBDIV_SHIFT	12
 #define PLLCTRL_BPFORCE_MASK	(1 << 4)
 #define PLLCTRL_PWRDWN_MASK	2
 #define PLLCTRL_PWRDWN_SHIFT	1
 #define PLLCTRL_RESET_MASK	1
 #define PLLCTRL_RESET_SHIFT	0

 #define ZYNQ_CLK_MAXDIV		0x3f
 #define CLK_CTRL_DIV1_SHIFT	20
 #define CLK_CTRL_DIV1_MASK	(ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV1_SHIFT)
 #define CLK_CTRL_DIV0_SHIFT	8
 #define CLK_CTRL_DIV0_MASK	(ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV0_SHIFT)
 #define CLK_CTRL_SRCSEL_SHIFT	4
 #define CLK_CTRL_SRCSEL_MASK	(0x3 << CLK_CTRL_SRCSEL_SHIFT)

 #define CLK_CTRL_DIV2X_SHIFT	26
 #define CLK_CTRL_DIV2X_MASK	(ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV2X_SHIFT)
 #define CLK_CTRL_DIV3X_SHIFT	20
 #define CLK_CTRL_DIV3X_MASK	(ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV3X_SHIFT)

 DECLARE_GLOBAL_DATA_PTR;

 #ifndef CONFIG_SPL_BUILD
 enum zynq_clk_rclk {mio_clk, emio_clk};
 #endif

 struct zynq_clk_priv {
 	ulong ps_clk_freq;
 #ifndef CONFIG_SPL_BUILD
 	struct clk gem_emio_clk[2];
 #endif
 };

 static void *zynq_clk_get_register(enum zynq_clk id)
 {
 	switch (id) {
 	case armpll_clk:
 		return &slcr_base->arm_pll_ctrl;
 	case ddrpll_clk:
 		return &slcr_base->ddr_pll_ctrl;
 	case iopll_clk:
 		return &slcr_base->io_pll_ctrl;
 	case lqspi_clk:
 		return &slcr_base->lqspi_clk_ctrl;
 	case smc_clk:
 		return &slcr_base->smc_clk_ctrl;
 	case pcap_clk:
 		return &slcr_base->pcap_clk_ctrl;
 	case sdio0_clk ... sdio1_clk:
 		return &slcr_base->sdio_clk_ctrl;
 	case uart0_clk ... uart1_clk:
 		return &slcr_base->uart_clk_ctrl;
 	case spi0_clk ... spi1_clk:
 		return &slcr_base->spi_clk_ctrl;
 #ifndef CONFIG_SPL_BUILD
 	case dci_clk:
 		return &slcr_base->dci_clk_ctrl;
 	case gem0_clk:
 		return &slcr_base->gem0_clk_ctrl;
 	case gem1_clk:
 		return &slcr_base->gem1_clk_ctrl;
 	case fclk0_clk:
 		return &slcr_base->fpga0_clk_ctrl;
 	case fclk1_clk:
 		return &slcr_base->fpga1_clk_ctrl;
 	case fclk2_clk:
 		return &slcr_base->fpga2_clk_ctrl;
 	case fclk3_clk:
 		return &slcr_base->fpga3_clk_ctrl;
 	case can0_clk ... can1_clk:
 		return &slcr_base->can_clk_ctrl;
 	case dbg_trc_clk ... dbg_apb_clk:
 		/* fall through */
 #endif
 	default:
 		return &slcr_base->dbg_clk_ctrl;
 	}
 }

 static enum zynq_clk zynq_clk_get_cpu_pll(u32 clk_ctrl)
 {
 	u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;

 	switch (srcsel) {
 	case 2:
 		return ddrpll_clk;
 	case 3:
 		return iopll_clk;
 	case 0 ... 1:
 	default:
 		return armpll_clk;
 	}
 }

 static enum zynq_clk zynq_clk_get_peripheral_pll(u32 clk_ctrl)
 {
 	u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;

 	switch (srcsel) {
 	case 2:
 		return armpll_clk;
 	case 3:
 		return ddrpll_clk;
 	case 0 ... 1:
 	default:
 		return iopll_clk;
 	}
 }

 static ulong zynq_clk_get_pll_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
 {
 	u32 clk_ctrl, reset, pwrdwn, mul, bypass;

 	clk_ctrl = readl(zynq_clk_get_register(id));

 	reset = (clk_ctrl & PLLCTRL_RESET_MASK) >> PLLCTRL_RESET_SHIFT;
 	pwrdwn = (clk_ctrl & PLLCTRL_PWRDWN_MASK) >> PLLCTRL_PWRDWN_SHIFT;
 	if (reset || pwrdwn)
 		return 0;

 	bypass = clk_ctrl & PLLCTRL_BPFORCE_MASK;
 	if (bypass)
 		mul = 1;
 	else
 		mul = (clk_ctrl & PLLCTRL_FBDIV_MASK) >> PLLCTRL_FBDIV_SHIFT;

 	return priv->ps_clk_freq * mul;
 }

 #ifndef CONFIG_SPL_BUILD
 static enum zynq_clk_rclk zynq_clk_get_gem_rclk(enum zynq_clk id)
 {
 	u32 clk_ctrl, srcsel;

 	if (id == gem0_clk)
 		clk_ctrl = readl(&slcr_base->gem0_rclk_ctrl);
 	else
 		clk_ctrl = readl(&slcr_base->gem1_rclk_ctrl);

 	srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
 	if (srcsel)
 		return emio_clk;
 	else
 		return mio_clk;
 }
 #endif

 static ulong zynq_clk_get_cpu_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
 {
 	u32 clk_621, clk_ctrl, div;
 	enum zynq_clk pll;

 	clk_ctrl = readl(&slcr_base->arm_clk_ctrl);

 	div = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;

 	switch (id) {
 	case cpu_1x_clk:
 		div *= 2;
 		/* fall through */
 	case cpu_2x_clk:
 		clk_621 = readl(&slcr_base->clk_621_true) & 1;
 		div *= 2 + clk_621;
 		break;
 	case cpu_3or2x_clk:
 		div *= 2;
 		/* fall through */
 	case cpu_6or4x_clk:
 		break;
 	default:
 		return 0;
 	}

 	pll = zynq_clk_get_cpu_pll(clk_ctrl);

 	return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, pll), div);
 }

 #ifndef CONFIG_SPL_BUILD
 static ulong zynq_clk_get_ddr2x_rate(struct zynq_clk_priv *priv)
 {
 	u32 clk_ctrl, div;

 	clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);

 	div = (clk_ctrl & CLK_CTRL_DIV2X_MASK) >> CLK_CTRL_DIV2X_SHIFT;

 	return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
 }
 #endif

 static ulong zynq_clk_get_ddr3x_rate(struct zynq_clk_priv *priv)
 {
 	u32 clk_ctrl, div;

 	clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);

 	div = (clk_ctrl & CLK_CTRL_DIV3X_MASK) >> CLK_CTRL_DIV3X_SHIFT;

 	return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
 }

 #ifndef CONFIG_SPL_BUILD
 static ulong zynq_clk_get_dci_rate(struct zynq_clk_priv *priv)
 {
 	u32 clk_ctrl, div0, div1;

 	clk_ctrl = readl(&slcr_base->dci_clk_ctrl);

 	div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
 	div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;

 	return DIV_ROUND_CLOSEST(DIV_ROUND_CLOSEST(
 		zynq_clk_get_pll_rate(priv, ddrpll_clk), div0), div1);
 }
 #endif

 static ulong zynq_clk_get_peripheral_rate(struct zynq_clk_priv *priv,
 					  enum zynq_clk id, bool two_divs)
 {
 	enum zynq_clk pll;
 	u32 clk_ctrl, div0;
 	u32 div1 = 1;

 	clk_ctrl = readl(zynq_clk_get_register(id));

 	div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
 	if (!div0)
 		div0 = 1;

 #ifndef CONFIG_SPL_BUILD
 	if (two_divs) {
 		div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
 		if (!div1)
 			div1 = 1;
 	}
 #endif

 	pll = zynq_clk_get_peripheral_pll(clk_ctrl);

 	return
 		DIV_ROUND_CLOSEST(
 			DIV_ROUND_CLOSEST(
 				zynq_clk_get_pll_rate(priv, pll), div0),
 			div1);
 }

 #ifndef CONFIG_SPL_BUILD
 static ulong zynq_clk_get_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
 {
 	struct clk *parent;

 	if (zynq_clk_get_gem_rclk(id) == mio_clk)
 		return zynq_clk_get_peripheral_rate(priv, id, true);

 	parent = &priv->gem_emio_clk[id - gem0_clk];
 	if (parent->dev)
 		return clk_get_rate(parent);

 	debug("%s: gem%d emio rx clock source unknown\n", __func__,
 	      id - gem0_clk);

 	return -ENOSYS;
 }

 static unsigned long zynq_clk_calc_peripheral_two_divs(ulong rate,
 						       ulong pll_rate,
 						       u32 *div0, u32 *div1)
 {
 	long new_err, best_err = (long)(~0UL >> 1);
 	ulong new_rate, best_rate = 0;
 	u32 d0, d1;

 	for (d0 = 1; d0 <= ZYNQ_CLK_MAXDIV; d0++) {
 		for (d1 = 1; d1 <= ZYNQ_CLK_MAXDIV >> 1; d1++) {
 			new_rate = DIV_ROUND_CLOSEST(
 					DIV_ROUND_CLOSEST(pll_rate, d0), d1);
 			new_err = abs(new_rate - rate);

 			if (new_err < best_err) {
 				*div0 = d0;
 				*div1 = d1;
 				best_err = new_err;
 				best_rate = new_rate;
 			}
 		}
 	}

 	return best_rate;
 }

 static ulong zynq_clk_set_peripheral_rate(struct zynq_clk_priv *priv,
 					  enum zynq_clk id, ulong rate,
 					  bool two_divs)
 {
 	enum zynq_clk pll;
 	u32 clk_ctrl, div0 = 0, div1 = 0;
 	ulong pll_rate, new_rate;
 	u32 *reg;

 	reg = zynq_clk_get_register(id);
 	clk_ctrl = readl(reg);

 	pll = zynq_clk_get_peripheral_pll(clk_ctrl);
 	pll_rate = zynq_clk_get_pll_rate(priv, pll);
 	clk_ctrl &= ~CLK_CTRL_DIV0_MASK;
 	if (two_divs) {
 		clk_ctrl &= ~CLK_CTRL_DIV1_MASK;
 		new_rate = zynq_clk_calc_peripheral_two_divs(rate, pll_rate,
 				&div0, &div1);
 		clk_ctrl |= div1 << CLK_CTRL_DIV1_SHIFT;
 	} else {
 		div0 = DIV_ROUND_CLOSEST(pll_rate, rate);
 		if (div0 > ZYNQ_CLK_MAXDIV)
 			div0 = ZYNQ_CLK_MAXDIV;
 		new_rate = DIV_ROUND_CLOSEST(rate, div0);
 	}
 	clk_ctrl |= div0 << CLK_CTRL_DIV0_SHIFT;

 	zynq_slcr_unlock();
 	writel(clk_ctrl, reg);
 	zynq_slcr_lock();

 	return new_rate;
 }

 static ulong zynq_clk_set_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id,
 				   ulong rate)
 {
 	struct clk *parent;

 	if (zynq_clk_get_gem_rclk(id) == mio_clk)
 		return zynq_clk_set_peripheral_rate(priv, id, rate, true);

 	parent = &priv->gem_emio_clk[id - gem0_clk];
 	if (parent->dev)
 		return clk_set_rate(parent, rate);

 	debug("%s: gem%d emio rx clock source unknown\n", __func__,
 	      id - gem0_clk);

 	return -ENOSYS;
 }
 #endif

 #ifndef CONFIG_SPL_BUILD
 static ulong zynq_clk_get_rate(struct clk *clk)
 {
 	struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
 	enum zynq_clk id = clk->id;
 	bool two_divs = false;

 	switch (id) {
 	case armpll_clk ... iopll_clk:
 		return zynq_clk_get_pll_rate(priv, id);
 	case cpu_6or4x_clk ... cpu_1x_clk:
 		return zynq_clk_get_cpu_rate(priv, id);
 	case ddr2x_clk:
 		return zynq_clk_get_ddr2x_rate(priv);
 	case ddr3x_clk:
 		return zynq_clk_get_ddr3x_rate(priv);
 	case dci_clk:
 		return zynq_clk_get_dci_rate(priv);
 	case gem0_clk ... gem1_clk:
 		return zynq_clk_get_gem_rate(priv, id);
 	case fclk0_clk ... can1_clk:
 		two_divs = true;
 		/* fall through */
 	case dbg_trc_clk ... dbg_apb_clk:
 	case lqspi_clk ... pcap_clk:
 	case sdio0_clk ... spi1_clk:
 		return zynq_clk_get_peripheral_rate(priv, id, two_divs);
 	case dma_clk:
 		return zynq_clk_get_cpu_rate(priv, cpu_2x_clk);
 	case usb0_aper_clk ... swdt_clk:
 		return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
 	default:
 		return -ENXIO;
 	}
 }

 static ulong zynq_clk_set_rate(struct clk *clk, ulong rate)
 {
 	struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
 	enum zynq_clk id = clk->id;
 	bool two_divs = false;

 	switch (id) {
 	case gem0_clk ... gem1_clk:
 		return zynq_clk_set_gem_rate(priv, id, rate);
 	case fclk0_clk ... can1_clk:
 		two_divs = true;
 		/* fall through */
 	case lqspi_clk ... pcap_clk:
 	case sdio0_clk ... spi1_clk:
 	case dbg_trc_clk ... dbg_apb_clk:
 		return zynq_clk_set_peripheral_rate(priv, id, rate, two_divs);
 	default:
 		return -ENXIO;
 	}
 }
 #else
 static ulong zynq_clk_get_rate(struct clk *clk)
 {
 	struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
 	enum zynq_clk id = clk->id;

 	switch (id) {
 	case cpu_6or4x_clk ... cpu_1x_clk:
 		return zynq_clk_get_cpu_rate(priv, id);
 	case ddr3x_clk:
 		return zynq_clk_get_ddr3x_rate(priv);
 	case lqspi_clk ... pcap_clk:
 	case sdio0_clk ... spi1_clk:
 		return zynq_clk_get_peripheral_rate(priv, id, 0);
 	case i2c0_aper_clk ... i2c1_aper_clk:
 		return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
 	default:
 		return -ENXIO;
 	}
 }
 #endif

 static struct clk_ops zynq_clk_ops = {
 	.get_rate = zynq_clk_get_rate,
 #ifndef CONFIG_SPL_BUILD
 	.set_rate = zynq_clk_set_rate,
 #endif
 };

 static int zynq_clk_probe(struct udevice *dev)
 {
 	struct zynq_clk_priv *priv = dev_get_priv(dev);
 #ifndef CONFIG_SPL_BUILD
 	unsigned int i;
 	char name[16];
 	int ret;

 	for (i = 0; i < 2; i++) {
 		sprintf(name, "gem%d_emio_clk", i);
 		ret = clk_get_by_name(dev, name, &priv->gem_emio_clk[i]);
 		if (ret < 0 && ret != -ENODATA) {
 			dev_err(dev, "failed to get %s clock\n", name);
 			return ret;
 		}
 	}
 #endif

 	priv->ps_clk_freq = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
 					    "ps-clk-frequency", 33333333UL);

 	return 0;
 }

 static const struct udevice_id zynq_clk_ids[] = {
 	{ .compatible = "xlnx,ps7-clkc"},
 	{}
 };

 U_BOOT_DRIVER(zynq_clk) = {
 	.name		= "zynq_clk",
 	.id		= UCLASS_CLK,
 	.of_match	= zynq_clk_ids,
 	.ops		= &zynq_clk_ops,
 	.priv_auto_alloc_size = sizeof(struct zynq_clk_priv),
 	.probe		= zynq_clk_probe,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2017 Weidmüller Interface GmbH & Co. KG
	* Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
	*
	* Copyright (C) 2013 Soren Brinkmann <soren.brinkmann@xilinx.com>
	* Copyright (C) 2013 Xilinx, Inc. All rights reserved.
	*/

	#include <common.h>
	#include <clk-uclass.h>
	#include <dm.h>
	#include <dm/lists.h>
	#include <errno.h>
	#include <asm/io.h>
	#include <asm/arch/clk.h>
	#include <asm/arch/hardware.h>
	#include <asm/arch/sys_proto.h>

	/* Register bitfield defines */
	#define PLLCTRL_FBDIV_MASK 0x7f000
	#define PLLCTRL_FBDIV_SHIFT 12
	#define PLLCTRL_BPFORCE_MASK (1 << 4)
	#define PLLCTRL_PWRDWN_MASK 2
	#define PLLCTRL_PWRDWN_SHIFT 1
	#define PLLCTRL_RESET_MASK 1
	#define PLLCTRL_RESET_SHIFT 0

	#define ZYNQ_CLK_MAXDIV 0x3f
	#define CLK_CTRL_DIV1_SHIFT 20
	#define CLK_CTRL_DIV1_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV1_SHIFT)
	#define CLK_CTRL_DIV0_SHIFT 8
	#define CLK_CTRL_DIV0_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV0_SHIFT)
	#define CLK_CTRL_SRCSEL_SHIFT 4
	#define CLK_CTRL_SRCSEL_MASK (0x3 << CLK_CTRL_SRCSEL_SHIFT)

	#define CLK_CTRL_DIV2X_SHIFT 26
	#define CLK_CTRL_DIV2X_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV2X_SHIFT)
	#define CLK_CTRL_DIV3X_SHIFT 20
	#define CLK_CTRL_DIV3X_MASK (ZYNQ_CLK_MAXDIV << CLK_CTRL_DIV3X_SHIFT)

	DECLARE_GLOBAL_DATA_PTR;

	#ifndef CONFIG_SPL_BUILD
	enum zynq_clk_rclk {mio_clk, emio_clk};
	#endif

	struct zynq_clk_priv {
	ulong ps_clk_freq;
	#ifndef CONFIG_SPL_BUILD
	struct clk gem_emio_clk[2];
	#endif
	};

	static void *zynq_clk_get_register(enum zynq_clk id)
	{
	switch (id) {
	case armpll_clk:
	return &slcr_base->arm_pll_ctrl;
	case ddrpll_clk:
	return &slcr_base->ddr_pll_ctrl;
	case iopll_clk:
	return &slcr_base->io_pll_ctrl;
	case lqspi_clk:
	return &slcr_base->lqspi_clk_ctrl;
	case smc_clk:
	return &slcr_base->smc_clk_ctrl;
	case pcap_clk:
	return &slcr_base->pcap_clk_ctrl;
	case sdio0_clk ... sdio1_clk:
	return &slcr_base->sdio_clk_ctrl;
	case uart0_clk ... uart1_clk:
	return &slcr_base->uart_clk_ctrl;
	case spi0_clk ... spi1_clk:
	return &slcr_base->spi_clk_ctrl;
	#ifndef CONFIG_SPL_BUILD
	case dci_clk:
	return &slcr_base->dci_clk_ctrl;
	case gem0_clk:
	return &slcr_base->gem0_clk_ctrl;
	case gem1_clk:
	return &slcr_base->gem1_clk_ctrl;
	case fclk0_clk:
	return &slcr_base->fpga0_clk_ctrl;
	case fclk1_clk:
	return &slcr_base->fpga1_clk_ctrl;
	case fclk2_clk:
	return &slcr_base->fpga2_clk_ctrl;
	case fclk3_clk:
	return &slcr_base->fpga3_clk_ctrl;
	case can0_clk ... can1_clk:
	return &slcr_base->can_clk_ctrl;
	case dbg_trc_clk ... dbg_apb_clk:
	/* fall through */
	#endif
	default:
	return &slcr_base->dbg_clk_ctrl;
	}
	}

	static enum zynq_clk zynq_clk_get_cpu_pll(u32 clk_ctrl)
	{
	u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;

	switch (srcsel) {
	case 2:
	return ddrpll_clk;
	case 3:
	return iopll_clk;
	case 0 ... 1:
	default:
	return armpll_clk;
	}
	}

	static enum zynq_clk zynq_clk_get_peripheral_pll(u32 clk_ctrl)
	{
	u32 srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;

	switch (srcsel) {
	case 2:
	return armpll_clk;
	case 3:
	return ddrpll_clk;
	case 0 ... 1:
	default:
	return iopll_clk;
	}
	}

	static ulong zynq_clk_get_pll_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
	{
	u32 clk_ctrl, reset, pwrdwn, mul, bypass;

	clk_ctrl = readl(zynq_clk_get_register(id));

	reset = (clk_ctrl & PLLCTRL_RESET_MASK) >> PLLCTRL_RESET_SHIFT;
	pwrdwn = (clk_ctrl & PLLCTRL_PWRDWN_MASK) >> PLLCTRL_PWRDWN_SHIFT;
	if (reset \|\| pwrdwn)
	return 0;

	bypass = clk_ctrl & PLLCTRL_BPFORCE_MASK;
	if (bypass)
	mul = 1;
	else
	mul = (clk_ctrl & PLLCTRL_FBDIV_MASK) >> PLLCTRL_FBDIV_SHIFT;

	return priv->ps_clk_freq * mul;
	}

	#ifndef CONFIG_SPL_BUILD
	static enum zynq_clk_rclk zynq_clk_get_gem_rclk(enum zynq_clk id)
	{
	u32 clk_ctrl, srcsel;

	if (id == gem0_clk)
	clk_ctrl = readl(&slcr_base->gem0_rclk_ctrl);
	else
	clk_ctrl = readl(&slcr_base->gem1_rclk_ctrl);

	srcsel = (clk_ctrl & CLK_CTRL_SRCSEL_MASK) >> CLK_CTRL_SRCSEL_SHIFT;
	if (srcsel)
	return emio_clk;
	else
	return mio_clk;
	}
	#endif

	static ulong zynq_clk_get_cpu_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
	{
	u32 clk_621, clk_ctrl, div;
	enum zynq_clk pll;

	clk_ctrl = readl(&slcr_base->arm_clk_ctrl);

	div = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;

	switch (id) {
	case cpu_1x_clk:
	div *= 2;
	/* fall through */
	case cpu_2x_clk:
	clk_621 = readl(&slcr_base->clk_621_true) & 1;
	div *= 2 + clk_621;
	break;
	case cpu_3or2x_clk:
	div *= 2;
	/* fall through */
	case cpu_6or4x_clk:
	break;
	default:
	return 0;
	}

	pll = zynq_clk_get_cpu_pll(clk_ctrl);

	return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, pll), div);
	}

	#ifndef CONFIG_SPL_BUILD
	static ulong zynq_clk_get_ddr2x_rate(struct zynq_clk_priv *priv)
	{
	u32 clk_ctrl, div;

	clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);

	div = (clk_ctrl & CLK_CTRL_DIV2X_MASK) >> CLK_CTRL_DIV2X_SHIFT;

	return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
	}
	#endif

	static ulong zynq_clk_get_ddr3x_rate(struct zynq_clk_priv *priv)
	{
	u32 clk_ctrl, div;

	clk_ctrl = readl(&slcr_base->ddr_clk_ctrl);

	div = (clk_ctrl & CLK_CTRL_DIV3X_MASK) >> CLK_CTRL_DIV3X_SHIFT;

	return DIV_ROUND_CLOSEST(zynq_clk_get_pll_rate(priv, ddrpll_clk), div);
	}

	#ifndef CONFIG_SPL_BUILD
	static ulong zynq_clk_get_dci_rate(struct zynq_clk_priv *priv)
	{
	u32 clk_ctrl, div0, div1;

	clk_ctrl = readl(&slcr_base->dci_clk_ctrl);

	div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
	div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;

	return DIV_ROUND_CLOSEST(DIV_ROUND_CLOSEST(
	zynq_clk_get_pll_rate(priv, ddrpll_clk), div0), div1);
	}
	#endif

	static ulong zynq_clk_get_peripheral_rate(struct zynq_clk_priv *priv,
	enum zynq_clk id, bool two_divs)
	{
	enum zynq_clk pll;
	u32 clk_ctrl, div0;
	u32 div1 = 1;

	clk_ctrl = readl(zynq_clk_get_register(id));

	div0 = (clk_ctrl & CLK_CTRL_DIV0_MASK) >> CLK_CTRL_DIV0_SHIFT;
	if (!div0)
	div0 = 1;

	#ifndef CONFIG_SPL_BUILD
	if (two_divs) {
	div1 = (clk_ctrl & CLK_CTRL_DIV1_MASK) >> CLK_CTRL_DIV1_SHIFT;
	if (!div1)
	div1 = 1;
	}
	#endif

	pll = zynq_clk_get_peripheral_pll(clk_ctrl);

	return
	DIV_ROUND_CLOSEST(
	DIV_ROUND_CLOSEST(
	zynq_clk_get_pll_rate(priv, pll), div0),
	div1);
	}

	#ifndef CONFIG_SPL_BUILD
	static ulong zynq_clk_get_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id)
	{
	struct clk *parent;

	if (zynq_clk_get_gem_rclk(id) == mio_clk)
	return zynq_clk_get_peripheral_rate(priv, id, true);

	parent = &priv->gem_emio_clk[id - gem0_clk];
	if (parent->dev)
	return clk_get_rate(parent);

	debug("%s: gem%d emio rx clock source unknown\n", __func__,
	id - gem0_clk);

	return -ENOSYS;
	}

	static unsigned long zynq_clk_calc_peripheral_two_divs(ulong rate,
	ulong pll_rate,
	u32 div0, u32 div1)
	{
	long new_err, best_err = (long)(~0UL >> 1);
	ulong new_rate, best_rate = 0;
	u32 d0, d1;

	for (d0 = 1; d0 <= ZYNQ_CLK_MAXDIV; d0++) {
	for (d1 = 1; d1 <= ZYNQ_CLK_MAXDIV >> 1; d1++) {
	new_rate = DIV_ROUND_CLOSEST(
	DIV_ROUND_CLOSEST(pll_rate, d0), d1);
	new_err = abs(new_rate - rate);

	if (new_err < best_err) {
	*div0 = d0;
	*div1 = d1;
	best_err = new_err;
	best_rate = new_rate;
	}
	}
	}

	return best_rate;
	}

	static ulong zynq_clk_set_peripheral_rate(struct zynq_clk_priv *priv,
	enum zynq_clk id, ulong rate,
	bool two_divs)
	{
	enum zynq_clk pll;
	u32 clk_ctrl, div0 = 0, div1 = 0;
	ulong pll_rate, new_rate;
	u32 *reg;

	reg = zynq_clk_get_register(id);
	clk_ctrl = readl(reg);

	pll = zynq_clk_get_peripheral_pll(clk_ctrl);
	pll_rate = zynq_clk_get_pll_rate(priv, pll);
	clk_ctrl &= ~CLK_CTRL_DIV0_MASK;
	if (two_divs) {
	clk_ctrl &= ~CLK_CTRL_DIV1_MASK;
	new_rate = zynq_clk_calc_peripheral_two_divs(rate, pll_rate,
	&div0, &div1);
	clk_ctrl \|= div1 << CLK_CTRL_DIV1_SHIFT;
	} else {
	div0 = DIV_ROUND_CLOSEST(pll_rate, rate);
	if (div0 > ZYNQ_CLK_MAXDIV)
	div0 = ZYNQ_CLK_MAXDIV;
	new_rate = DIV_ROUND_CLOSEST(rate, div0);
	}
	clk_ctrl \|= div0 << CLK_CTRL_DIV0_SHIFT;

	zynq_slcr_unlock();
	writel(clk_ctrl, reg);
	zynq_slcr_lock();

	return new_rate;
	}

	static ulong zynq_clk_set_gem_rate(struct zynq_clk_priv *priv, enum zynq_clk id,
	ulong rate)
	{
	struct clk *parent;

	if (zynq_clk_get_gem_rclk(id) == mio_clk)
	return zynq_clk_set_peripheral_rate(priv, id, rate, true);

	parent = &priv->gem_emio_clk[id - gem0_clk];
	if (parent->dev)
	return clk_set_rate(parent, rate);

	debug("%s: gem%d emio rx clock source unknown\n", __func__,
	id - gem0_clk);

	return -ENOSYS;
	}
	#endif

	#ifndef CONFIG_SPL_BUILD
	static ulong zynq_clk_get_rate(struct clk *clk)
	{
	struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
	enum zynq_clk id = clk->id;
	bool two_divs = false;

	switch (id) {
	case armpll_clk ... iopll_clk:
	return zynq_clk_get_pll_rate(priv, id);
	case cpu_6or4x_clk ... cpu_1x_clk:
	return zynq_clk_get_cpu_rate(priv, id);
	case ddr2x_clk:
	return zynq_clk_get_ddr2x_rate(priv);
	case ddr3x_clk:
	return zynq_clk_get_ddr3x_rate(priv);
	case dci_clk:
	return zynq_clk_get_dci_rate(priv);
	case gem0_clk ... gem1_clk:
	return zynq_clk_get_gem_rate(priv, id);
	case fclk0_clk ... can1_clk:
	two_divs = true;
	/* fall through */
	case dbg_trc_clk ... dbg_apb_clk:
	case lqspi_clk ... pcap_clk:
	case sdio0_clk ... spi1_clk:
	return zynq_clk_get_peripheral_rate(priv, id, two_divs);
	case dma_clk:
	return zynq_clk_get_cpu_rate(priv, cpu_2x_clk);
	case usb0_aper_clk ... swdt_clk:
	return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
	default:
	return -ENXIO;
	}
	}

	static ulong zynq_clk_set_rate(struct clk *clk, ulong rate)
	{
	struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
	enum zynq_clk id = clk->id;
	bool two_divs = false;

	switch (id) {
	case gem0_clk ... gem1_clk:
	return zynq_clk_set_gem_rate(priv, id, rate);
	case fclk0_clk ... can1_clk:
	two_divs = true;
	/* fall through */
	case lqspi_clk ... pcap_clk:
	case sdio0_clk ... spi1_clk:
	case dbg_trc_clk ... dbg_apb_clk:
	return zynq_clk_set_peripheral_rate(priv, id, rate, two_divs);
	default:
	return -ENXIO;
	}
	}
	#else
	static ulong zynq_clk_get_rate(struct clk *clk)
	{
	struct zynq_clk_priv *priv = dev_get_priv(clk->dev);
	enum zynq_clk id = clk->id;

	switch (id) {
	case cpu_6or4x_clk ... cpu_1x_clk:
	return zynq_clk_get_cpu_rate(priv, id);
	case ddr3x_clk:
	return zynq_clk_get_ddr3x_rate(priv);
	case lqspi_clk ... pcap_clk:
	case sdio0_clk ... spi1_clk:
	return zynq_clk_get_peripheral_rate(priv, id, 0);
	case i2c0_aper_clk ... i2c1_aper_clk:
	return zynq_clk_get_cpu_rate(priv, cpu_1x_clk);
	default:
	return -ENXIO;
	}
	}
	#endif

	static struct clk_ops zynq_clk_ops = {
	.get_rate = zynq_clk_get_rate,
	#ifndef CONFIG_SPL_BUILD
	.set_rate = zynq_clk_set_rate,
	#endif
	};

	static int zynq_clk_probe(struct udevice *dev)
	{
	struct zynq_clk_priv *priv = dev_get_priv(dev);
	#ifndef CONFIG_SPL_BUILD
	unsigned int i;
	char name[16];
	int ret;

	for (i = 0; i < 2; i++) {
	sprintf(name, "gem%d_emio_clk", i);
	ret = clk_get_by_name(dev, name, &priv->gem_emio_clk[i]);
	if (ret < 0 && ret != -ENODATA) {
	dev_err(dev, "failed to get %s clock\n", name);
	return ret;
	}
	}
	#endif

	priv->ps_clk_freq = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
	"ps-clk-frequency", 33333333UL);

	return 0;
	}

	static const struct udevice_id zynq_clk_ids[] = {
	{ .compatible = "xlnx,ps7-clkc"},
	{}
	};

	U_BOOT_DRIVER(zynq_clk) = {
	.name = "zynq_clk",
	.id = UCLASS_CLK,
	.of_match = zynq_clk_ids,
	.ops = &zynq_clk_ops,
	.priv_auto_alloc_size = sizeof(struct zynq_clk_priv),
	.probe = zynq_clk_probe,
	};