drivers/clk/meson/g12a.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2018 - Beniamino Galvani <b.galvani@gmail.com>
  * (C) Copyright 2018 - BayLibre, SAS
  * Author: Neil Armstrong <narmstrong@baylibre.com>
  */

 #include <common.h>
 #include <asm/arch/clock-g12a.h>
 #include <asm/io.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <regmap.h>
 #include <syscon.h>
 #include <div64.h>
 #include <dt-bindings/clock/g12a-clkc.h>
 #include "clk_meson.h"

 #define XTAL_RATE 24000000

 struct meson_clk {
 	struct regmap *map;
 };

 static ulong meson_clk_set_rate_by_id(struct clk *clk, unsigned long id,
 				      ulong rate, ulong current_rate);
 static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id);

 #define NUM_CLKS 178

 static struct meson_gate gates[NUM_CLKS] = {
 	/* Everything Else (EE) domain gates */
 	MESON_GATE(CLKID_SPICC0, HHI_GCLK_MPEG0, 8),
 	MESON_GATE(CLKID_I2C, HHI_GCLK_MPEG0, 9),
 	MESON_GATE(CLKID_UART0, HHI_GCLK_MPEG0, 13),
 	MESON_GATE(CLKID_SPICC1, HHI_GCLK_MPEG0, 14),
 	MESON_GATE(CLKID_SD_EMMC_B, HHI_GCLK_MPEG0, 25),
 	MESON_GATE(CLKID_SD_EMMC_C, HHI_GCLK_MPEG0, 26),
 	MESON_GATE(CLKID_ETH, HHI_GCLK_MPEG1, 3),
 	MESON_GATE(CLKID_UART1, HHI_GCLK_MPEG1, 16),
 	MESON_GATE(CLKID_USB, HHI_GCLK_MPEG1, 25),
 	MESON_GATE(CLKID_USB1_DDR_BRIDGE, HHI_GCLK_MPEG2, 8),

 	/* Peripheral Gates */
 	MESON_GATE(CLKID_SD_EMMC_B_CLK0, HHI_SD_EMMC_CLK_CNTL, 23),
 	MESON_GATE(CLKID_SD_EMMC_C_CLK0, HHI_NAND_CLK_CNTL, 7),
 };

 static int meson_set_gate(struct clk *clk, bool on)
 {
 	struct meson_clk *priv = dev_get_priv(clk->dev);
 	struct meson_gate *gate;

 	if (clk->id >= ARRAY_SIZE(gates))
 		return -ENOENT;

 	gate = &gates[clk->id];

 	if (gate->reg == 0)
 		return 0;

 	regmap_update_bits(priv->map, gate->reg,
 			   BIT(gate->bit), on ? BIT(gate->bit) : 0);

 	return 0;
 }

 static int meson_clk_enable(struct clk *clk)
 {
 	return meson_set_gate(clk, true);
 }

 static int meson_clk_disable(struct clk *clk)
 {
 	return meson_set_gate(clk, false);
 }

 static unsigned long meson_clk81_get_rate(struct clk *clk)
 {
 	struct meson_clk *priv = dev_get_priv(clk->dev);
 	unsigned long parent_rate;
 	uint reg;
 	int parents[] = {
 		-1,
 		-1,
 		CLKID_FCLK_DIV7,
 		CLKID_MPLL1,
 		CLKID_MPLL2,
 		CLKID_FCLK_DIV4,
 		CLKID_FCLK_DIV3,
 		CLKID_FCLK_DIV5
 	};

 	/* mux */
 	regmap_read(priv->map, HHI_MPEG_CLK_CNTL, &reg);
 	reg = (reg >> 12) & 7;

 	switch (reg) {
 	case 0:
 		parent_rate = XTAL_RATE;
 		break;
 	case 1:
 		return -ENOENT;
 	default:
 		parent_rate = meson_clk_get_rate_by_id(clk, parents[reg]);
 	}

 	/* divider */
 	regmap_read(priv->map, HHI_MPEG_CLK_CNTL, &reg);
 	reg = reg & ((1 << 7) - 1);

 	return parent_rate / reg;
 }

 static long mpll_rate_from_params(unsigned long parent_rate,
 				  unsigned long sdm,
 				  unsigned long n2)
 {
 	unsigned long divisor = (SDM_DEN * n2) + sdm;

 	if (n2 < N2_MIN)
 		return -EINVAL;

 	return DIV_ROUND_UP_ULL((u64)parent_rate * SDM_DEN, divisor);
 }

 static struct parm meson_mpll0_parm[2] = {
 	{HHI_MPLL_CNTL1, 0, 14}, /* psdm */
 	{HHI_MPLL_CNTL1, 20, 9}, /* pn2 */
 };

 static struct parm meson_mpll1_parm[2] = {
 	{HHI_MPLL_CNTL3, 0, 14}, /* psdm */
 	{HHI_MPLL_CNTL3, 20, 9}, /* pn2 */
 };

 static struct parm meson_mpll2_parm[2] = {
 	{HHI_MPLL_CNTL5, 0, 14}, /* psdm */
 	{HHI_MPLL_CNTL5, 20, 9}, /* pn2 */
 };

 /*
  * MultiPhase Locked Loops are outputs from a PLL with additional frequency
  * scaling capabilities. MPLL rates are calculated as:
  *
  * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
  */
 static ulong meson_mpll_get_rate(struct clk *clk, unsigned long id)
 {
 	struct meson_clk *priv = dev_get_priv(clk->dev);
 	struct parm *psdm, *pn2;
 	unsigned long sdm, n2;
 	unsigned long parent_rate;
 	uint reg;

 	switch (id) {
 	case CLKID_MPLL0:
 		psdm = &meson_mpll0_parm[0];
 		pn2 = &meson_mpll0_parm[1];
 		break;
 	case CLKID_MPLL1:
 		psdm = &meson_mpll1_parm[0];
 		pn2 = &meson_mpll1_parm[1];
 		break;
 	case CLKID_MPLL2:
 		psdm = &meson_mpll2_parm[0];
 		pn2 = &meson_mpll2_parm[1];
 		break;
 	default:
 		return -ENOENT;
 	}

 	parent_rate = meson_clk_get_rate_by_id(clk, CLKID_FIXED_PLL);
 	if (IS_ERR_VALUE(parent_rate))
 		return parent_rate;

 	regmap_read(priv->map, psdm->reg_off, &reg);
 	sdm = PARM_GET(psdm->width, psdm->shift, reg);

 	regmap_read(priv->map, pn2->reg_off, &reg);
 	n2 = PARM_GET(pn2->width, pn2->shift, reg);

 	return mpll_rate_from_params(parent_rate, sdm, n2);
 }

 static struct parm meson_fixed_pll_parm[3] = {
 	{HHI_FIX_PLL_CNTL0, 0, 8}, /* pm */
 	{HHI_FIX_PLL_CNTL0, 10, 5}, /* pn */
 	{HHI_FIX_PLL_CNTL0, 16, 2}, /* pod */
 };

 static struct parm meson_sys_pll_parm[3] = {
 	{HHI_SYS_PLL_CNTL0, 0, 8}, /* pm */
 	{HHI_SYS_PLL_CNTL0, 10, 5}, /* pn */
 	{HHI_SYS_PLL_CNTL0, 16, 2}, /* pod */
 };

 static ulong meson_pll_get_rate(struct clk *clk, unsigned long id)
 {
 	struct meson_clk *priv = dev_get_priv(clk->dev);
 	struct parm *pm, *pn, *pod;
 	unsigned long parent_rate_mhz = XTAL_RATE / 1000000;
 	u16 n, m, od;
 	uint reg;

 	/*
 	 * FIXME: Between the unit conversion and the missing frac, we know
 	 * rate will be slightly off ...
 	*/

 	switch (id) {
 	case CLKID_FIXED_PLL:
 		pm = &meson_fixed_pll_parm[0];
 		pn = &meson_fixed_pll_parm[1];
 		pod = &meson_fixed_pll_parm[2];
 		break;
 	case CLKID_SYS_PLL:
 		pm = &meson_sys_pll_parm[0];
 		pn = &meson_sys_pll_parm[1];
 		pod = &meson_sys_pll_parm[2];
 		break;
 	default:
 		return -ENOENT;
 	}

 	regmap_read(priv->map, pn->reg_off, &reg);
 	n = PARM_GET(pn->width, pn->shift, reg);

 	regmap_read(priv->map, pm->reg_off, &reg);
 	m = PARM_GET(pm->width, pm->shift, reg);

 	regmap_read(priv->map, pod->reg_off, &reg);
 	od = PARM_GET(pod->width, pod->shift, reg);

 	return ((parent_rate_mhz * m / n) >> od) * 1000000;
 }

 static struct parm meson_pcie_pll_parm[3] = {
 	{HHI_PCIE_PLL_CNTL0, 0, 8}, /* pm */
 	{HHI_PCIE_PLL_CNTL0, 10, 5}, /* pn */
 	{HHI_PCIE_PLL_CNTL0, 16, 5}, /* pod */
 };

 static ulong meson_pcie_pll_get_rate(struct clk *clk)
 {
 	struct meson_clk *priv = dev_get_priv(clk->dev);
 	struct parm *pm, *pn, *pod;
 	unsigned long parent_rate_mhz = XTAL_RATE / 1000000;
 	u16 n, m, od;
 	uint reg;

 	pm = &meson_pcie_pll_parm[0];
 	pn = &meson_pcie_pll_parm[1];
 	pod = &meson_pcie_pll_parm[2];

 	regmap_read(priv->map, pn->reg_off, &reg);
 	n = PARM_GET(pn->width, pn->shift, reg);

 	regmap_read(priv->map, pm->reg_off, &reg);
 	m = PARM_GET(pm->width, pm->shift, reg);

 	regmap_read(priv->map, pod->reg_off, &reg);
 	od = PARM_GET(pod->width, pod->shift, reg);

 	return ((parent_rate_mhz * m / n) / 2 / od / 2) * 1000000;
 }

 static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id)
 {
 	ulong rate;

 	switch (id) {
 	case CLKID_FIXED_PLL:
 	case CLKID_SYS_PLL:
 		rate = meson_pll_get_rate(clk, id);
 		break;
 	case CLKID_FCLK_DIV2:
 		rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 2;
 		break;
 	case CLKID_FCLK_DIV3:
 		rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 3;
 		break;
 	case CLKID_FCLK_DIV4:
 		rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 4;
 		break;
 	case CLKID_FCLK_DIV5:
 		rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 5;
 		break;
 	case CLKID_FCLK_DIV7:
 		rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 7;
 		break;
 	case CLKID_MPLL0:
 	case CLKID_MPLL1:
 	case CLKID_MPLL2:
 		rate = meson_mpll_get_rate(clk, id);
 		break;
 	case CLKID_CLK81:
 		rate = meson_clk81_get_rate(clk);
 		break;
 	case CLKID_PCIE_PLL:
 		rate = meson_pcie_pll_get_rate(clk);
 		break;
 	default:
 		if (gates[id].reg != 0) {
 			/* a clock gate */
 			rate = meson_clk81_get_rate(clk);
 			break;
 		}
 		return -ENOENT;
 	}

 	debug("clock %lu has rate %lu\n", id, rate);
 	return rate;
 }

 static ulong meson_clk_get_rate(struct clk *clk)
 {
 	return meson_clk_get_rate_by_id(clk, clk->id);
 }

 static ulong meson_pcie_pll_set_rate(struct clk *clk, ulong rate)
 {
 	struct meson_clk *priv = dev_get_priv(clk->dev);

 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x20090496);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x30090496);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL1, 0x00000000);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL2, 0x00001100);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL3, 0x10058e00);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL4, 0x000100c0);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL5, 0x68000048);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL5, 0x68000068);
 	udelay(20);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL4, 0x008100c0);
 	udelay(10);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x34090496);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x14090496);
 	udelay(10);
 	regmap_write(priv->map, HHI_PCIE_PLL_CNTL2, 0x00001000);
 	regmap_update_bits(priv->map, HHI_PCIE_PLL_CNTL0,
 				0x1f << 16, 9 << 16);

 	return 100000000;
 }

 static ulong meson_clk_set_rate_by_id(struct clk *clk, unsigned long id,
 				      ulong rate, ulong current_rate)
 {
 	if (current_rate == rate)
 		return 0;

 	switch (id) {
 	/* Fixed clocks */
 	case CLKID_PCIE_PLL:
 		return meson_pcie_pll_set_rate(clk, rate);

 	default:
 		return -ENOENT;
 	}

 	return -EINVAL;
 }


 static ulong meson_clk_set_rate(struct clk *clk, ulong rate)
 {
 	ulong current_rate = meson_clk_get_rate_by_id(clk, clk->id);
 	int ret;

 	if (IS_ERR_VALUE(current_rate))
 		return current_rate;

 	debug("%s: setting rate of %ld from %ld to %ld\n",
 	      __func__, clk->id, current_rate, rate);

 	ret = meson_clk_set_rate_by_id(clk, clk->id, rate, current_rate);
 	if (IS_ERR_VALUE(ret))
 		return ret;

 	debug("clock %lu has new rate %lu\n", clk->id,
 	      meson_clk_get_rate_by_id(clk, clk->id));

 	return 0;
 }

 static int meson_clk_probe(struct udevice *dev)
 {
 	struct meson_clk *priv = dev_get_priv(dev);

 	priv->map = syscon_node_to_regmap(dev_get_parent(dev)->node);
 	if (IS_ERR(priv->map))
 		return PTR_ERR(priv->map);

 	debug("meson-clk-g12a: probed\n");

 	return 0;
 }

 static struct clk_ops meson_clk_ops = {
 	.disable	= meson_clk_disable,
 	.enable		= meson_clk_enable,
 	.get_rate	= meson_clk_get_rate,
 	.set_rate	= meson_clk_set_rate,
 };

 static const struct udevice_id meson_clk_ids[] = {
 	{ .compatible = "amlogic,g12a-clkc" },
 	{ .compatible = "amlogic,g12b-clkc" },
 	{ }
 };

 U_BOOT_DRIVER(meson_clk_g12a) = {
 	.name		= "meson_clk_g12a",
 	.id		= UCLASS_CLK,
 	.of_match	= meson_clk_ids,
 	.priv_auto_alloc_size = sizeof(struct meson_clk),
 	.ops		= &meson_clk_ops,
 	.probe		= meson_clk_probe,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2018 - Beniamino Galvani <b.galvani@gmail.com>
	* (C) Copyright 2018 - BayLibre, SAS
	* Author: Neil Armstrong <narmstrong@baylibre.com>
	*/

	#include <common.h>
	#include <asm/arch/clock-g12a.h>
	#include <asm/io.h>
	#include <clk-uclass.h>
	#include <dm.h>
	#include <regmap.h>
	#include <syscon.h>
	#include <div64.h>
	#include <dt-bindings/clock/g12a-clkc.h>
	#include "clk_meson.h"

	#define XTAL_RATE 24000000

	struct meson_clk {
	struct regmap *map;
	};

	static ulong meson_clk_set_rate_by_id(struct clk *clk, unsigned long id,
	ulong rate, ulong current_rate);
	static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id);

	#define NUM_CLKS 178

	static struct meson_gate gates[NUM_CLKS] = {
	/* Everything Else (EE) domain gates */
	MESON_GATE(CLKID_SPICC0, HHI_GCLK_MPEG0, 8),
	MESON_GATE(CLKID_I2C, HHI_GCLK_MPEG0, 9),
	MESON_GATE(CLKID_UART0, HHI_GCLK_MPEG0, 13),
	MESON_GATE(CLKID_SPICC1, HHI_GCLK_MPEG0, 14),
	MESON_GATE(CLKID_SD_EMMC_B, HHI_GCLK_MPEG0, 25),
	MESON_GATE(CLKID_SD_EMMC_C, HHI_GCLK_MPEG0, 26),
	MESON_GATE(CLKID_ETH, HHI_GCLK_MPEG1, 3),
	MESON_GATE(CLKID_UART1, HHI_GCLK_MPEG1, 16),
	MESON_GATE(CLKID_USB, HHI_GCLK_MPEG1, 25),
	MESON_GATE(CLKID_USB1_DDR_BRIDGE, HHI_GCLK_MPEG2, 8),

	/* Peripheral Gates */
	MESON_GATE(CLKID_SD_EMMC_B_CLK0, HHI_SD_EMMC_CLK_CNTL, 23),
	MESON_GATE(CLKID_SD_EMMC_C_CLK0, HHI_NAND_CLK_CNTL, 7),
	};

	static int meson_set_gate(struct clk *clk, bool on)
	{
	struct meson_clk *priv = dev_get_priv(clk->dev);
	struct meson_gate *gate;

	if (clk->id >= ARRAY_SIZE(gates))
	return -ENOENT;

	gate = &gates[clk->id];

	if (gate->reg == 0)
	return 0;

	regmap_update_bits(priv->map, gate->reg,
	BIT(gate->bit), on ? BIT(gate->bit) : 0);

	return 0;
	}

	static int meson_clk_enable(struct clk *clk)
	{
	return meson_set_gate(clk, true);
	}

	static int meson_clk_disable(struct clk *clk)
	{
	return meson_set_gate(clk, false);
	}

	static unsigned long meson_clk81_get_rate(struct clk *clk)
	{
	struct meson_clk *priv = dev_get_priv(clk->dev);
	unsigned long parent_rate;
	uint reg;
	int parents[] = {
	-1,
	-1,
	CLKID_FCLK_DIV7,
	CLKID_MPLL1,
	CLKID_MPLL2,
	CLKID_FCLK_DIV4,
	CLKID_FCLK_DIV3,
	CLKID_FCLK_DIV5
	};

	/* mux */
	regmap_read(priv->map, HHI_MPEG_CLK_CNTL, &reg);
	reg = (reg >> 12) & 7;

	switch (reg) {
	case 0:
	parent_rate = XTAL_RATE;
	break;
	case 1:
	return -ENOENT;
	default:
	parent_rate = meson_clk_get_rate_by_id(clk, parents[reg]);
	}

	/* divider */
	regmap_read(priv->map, HHI_MPEG_CLK_CNTL, &reg);
	reg = reg & ((1 << 7) - 1);

	return parent_rate / reg;
	}

	static long mpll_rate_from_params(unsigned long parent_rate,
	unsigned long sdm,
	unsigned long n2)
	{
	unsigned long divisor = (SDM_DEN * n2) + sdm;

	if (n2 < N2_MIN)
	return -EINVAL;

	return DIV_ROUND_UP_ULL((u64)parent_rate * SDM_DEN, divisor);
	}

	static struct parm meson_mpll0_parm[2] = {
	{HHI_MPLL_CNTL1, 0, 14}, /* psdm */
	{HHI_MPLL_CNTL1, 20, 9}, /* pn2 */
	};

	static struct parm meson_mpll1_parm[2] = {
	{HHI_MPLL_CNTL3, 0, 14}, /* psdm */
	{HHI_MPLL_CNTL3, 20, 9}, /* pn2 */
	};

	static struct parm meson_mpll2_parm[2] = {
	{HHI_MPLL_CNTL5, 0, 14}, /* psdm */
	{HHI_MPLL_CNTL5, 20, 9}, /* pn2 */
	};

	/*
	* MultiPhase Locked Loops are outputs from a PLL with additional frequency
	* scaling capabilities. MPLL rates are calculated as:
	*
	* f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
	*/
	static ulong meson_mpll_get_rate(struct clk *clk, unsigned long id)
	{
	struct meson_clk *priv = dev_get_priv(clk->dev);
	struct parm psdm, pn2;
	unsigned long sdm, n2;
	unsigned long parent_rate;
	uint reg;

	switch (id) {
	case CLKID_MPLL0:
	psdm = &meson_mpll0_parm[0];
	pn2 = &meson_mpll0_parm[1];
	break;
	case CLKID_MPLL1:
	psdm = &meson_mpll1_parm[0];
	pn2 = &meson_mpll1_parm[1];
	break;
	case CLKID_MPLL2:
	psdm = &meson_mpll2_parm[0];
	pn2 = &meson_mpll2_parm[1];
	break;
	default:
	return -ENOENT;
	}

	parent_rate = meson_clk_get_rate_by_id(clk, CLKID_FIXED_PLL);
	if (IS_ERR_VALUE(parent_rate))
	return parent_rate;

	regmap_read(priv->map, psdm->reg_off, &reg);
	sdm = PARM_GET(psdm->width, psdm->shift, reg);

	regmap_read(priv->map, pn2->reg_off, &reg);
	n2 = PARM_GET(pn2->width, pn2->shift, reg);

	return mpll_rate_from_params(parent_rate, sdm, n2);
	}

	static struct parm meson_fixed_pll_parm[3] = {
	{HHI_FIX_PLL_CNTL0, 0, 8}, /* pm */
	{HHI_FIX_PLL_CNTL0, 10, 5}, /* pn */
	{HHI_FIX_PLL_CNTL0, 16, 2}, /* pod */
	};

	static struct parm meson_sys_pll_parm[3] = {
	{HHI_SYS_PLL_CNTL0, 0, 8}, /* pm */
	{HHI_SYS_PLL_CNTL0, 10, 5}, /* pn */
	{HHI_SYS_PLL_CNTL0, 16, 2}, /* pod */
	};

	static ulong meson_pll_get_rate(struct clk *clk, unsigned long id)
	{
	struct meson_clk *priv = dev_get_priv(clk->dev);
	struct parm pm, pn, *pod;
	unsigned long parent_rate_mhz = XTAL_RATE / 1000000;
	u16 n, m, od;
	uint reg;

	/*
	* FIXME: Between the unit conversion and the missing frac, we know
	* rate will be slightly off ...
	*/

	switch (id) {
	case CLKID_FIXED_PLL:
	pm = &meson_fixed_pll_parm[0];
	pn = &meson_fixed_pll_parm[1];
	pod = &meson_fixed_pll_parm[2];
	break;
	case CLKID_SYS_PLL:
	pm = &meson_sys_pll_parm[0];
	pn = &meson_sys_pll_parm[1];
	pod = &meson_sys_pll_parm[2];
	break;
	default:
	return -ENOENT;
	}

	regmap_read(priv->map, pn->reg_off, &reg);
	n = PARM_GET(pn->width, pn->shift, reg);

	regmap_read(priv->map, pm->reg_off, &reg);
	m = PARM_GET(pm->width, pm->shift, reg);

	regmap_read(priv->map, pod->reg_off, &reg);
	od = PARM_GET(pod->width, pod->shift, reg);

	return ((parent_rate_mhz * m / n) >> od) * 1000000;
	}

	static struct parm meson_pcie_pll_parm[3] = {
	{HHI_PCIE_PLL_CNTL0, 0, 8}, /* pm */
	{HHI_PCIE_PLL_CNTL0, 10, 5}, /* pn */
	{HHI_PCIE_PLL_CNTL0, 16, 5}, /* pod */
	};

	static ulong meson_pcie_pll_get_rate(struct clk *clk)
	{
	struct meson_clk *priv = dev_get_priv(clk->dev);
	struct parm pm, pn, *pod;
	unsigned long parent_rate_mhz = XTAL_RATE / 1000000;
	u16 n, m, od;
	uint reg;

	pm = &meson_pcie_pll_parm[0];
	pn = &meson_pcie_pll_parm[1];
	pod = &meson_pcie_pll_parm[2];

	regmap_read(priv->map, pn->reg_off, &reg);
	n = PARM_GET(pn->width, pn->shift, reg);

	regmap_read(priv->map, pm->reg_off, &reg);
	m = PARM_GET(pm->width, pm->shift, reg);

	regmap_read(priv->map, pod->reg_off, &reg);
	od = PARM_GET(pod->width, pod->shift, reg);

	return ((parent_rate_mhz * m / n) / 2 / od / 2) * 1000000;
	}

	static ulong meson_clk_get_rate_by_id(struct clk *clk, unsigned long id)
	{
	ulong rate;

	switch (id) {
	case CLKID_FIXED_PLL:
	case CLKID_SYS_PLL:
	rate = meson_pll_get_rate(clk, id);
	break;
	case CLKID_FCLK_DIV2:
	rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 2;
	break;
	case CLKID_FCLK_DIV3:
	rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 3;
	break;
	case CLKID_FCLK_DIV4:
	rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 4;
	break;
	case CLKID_FCLK_DIV5:
	rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 5;
	break;
	case CLKID_FCLK_DIV7:
	rate = meson_pll_get_rate(clk, CLKID_FIXED_PLL) / 7;
	break;
	case CLKID_MPLL0:
	case CLKID_MPLL1:
	case CLKID_MPLL2:
	rate = meson_mpll_get_rate(clk, id);
	break;
	case CLKID_CLK81:
	rate = meson_clk81_get_rate(clk);
	break;
	case CLKID_PCIE_PLL:
	rate = meson_pcie_pll_get_rate(clk);
	break;
	default:
	if (gates[id].reg != 0) {
	/* a clock gate */
	rate = meson_clk81_get_rate(clk);
	break;
	}
	return -ENOENT;
	}

	debug("clock %lu has rate %lu\n", id, rate);
	return rate;
	}

	static ulong meson_clk_get_rate(struct clk *clk)
	{
	return meson_clk_get_rate_by_id(clk, clk->id);
	}

	static ulong meson_pcie_pll_set_rate(struct clk *clk, ulong rate)
	{
	struct meson_clk *priv = dev_get_priv(clk->dev);

	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x20090496);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x30090496);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL1, 0x00000000);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL2, 0x00001100);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL3, 0x10058e00);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL4, 0x000100c0);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL5, 0x68000048);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL5, 0x68000068);
	udelay(20);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL4, 0x008100c0);
	udelay(10);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x34090496);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL0, 0x14090496);
	udelay(10);
	regmap_write(priv->map, HHI_PCIE_PLL_CNTL2, 0x00001000);
	regmap_update_bits(priv->map, HHI_PCIE_PLL_CNTL0,
	0x1f << 16, 9 << 16);

	return 100000000;
	}

	static ulong meson_clk_set_rate_by_id(struct clk *clk, unsigned long id,
	ulong rate, ulong current_rate)
	{
	if (current_rate == rate)
	return 0;

	switch (id) {
	/* Fixed clocks */
	case CLKID_PCIE_PLL:
	return meson_pcie_pll_set_rate(clk, rate);

	default:
	return -ENOENT;
	}

	return -EINVAL;
	}


	static ulong meson_clk_set_rate(struct clk *clk, ulong rate)
	{
	ulong current_rate = meson_clk_get_rate_by_id(clk, clk->id);
	int ret;

	if (IS_ERR_VALUE(current_rate))
	return current_rate;

	debug("%s: setting rate of %ld from %ld to %ld\n",
	__func__, clk->id, current_rate, rate);

	ret = meson_clk_set_rate_by_id(clk, clk->id, rate, current_rate);
	if (IS_ERR_VALUE(ret))
	return ret;

	debug("clock %lu has new rate %lu\n", clk->id,
	meson_clk_get_rate_by_id(clk, clk->id));

	return 0;
	}

	static int meson_clk_probe(struct udevice *dev)
	{
	struct meson_clk *priv = dev_get_priv(dev);

	priv->map = syscon_node_to_regmap(dev_get_parent(dev)->node);
	if (IS_ERR(priv->map))
	return PTR_ERR(priv->map);

	debug("meson-clk-g12a: probed\n");

	return 0;
	}

	static struct clk_ops meson_clk_ops = {
	.disable = meson_clk_disable,
	.enable = meson_clk_enable,
	.get_rate = meson_clk_get_rate,
	.set_rate = meson_clk_set_rate,
	};

	static const struct udevice_id meson_clk_ids[] = {
	{ .compatible = "amlogic,g12a-clkc" },
	{ .compatible = "amlogic,g12b-clkc" },
	{ }
	};

	U_BOOT_DRIVER(meson_clk_g12a) = {
	.name = "meson_clk_g12a",
	.id = UCLASS_CLK,
	.of_match = meson_clk_ids,
	.priv_auto_alloc_size = sizeof(struct meson_clk),
	.ops = &meson_clk_ops,
	.probe = meson_clk_probe,
	};