drivers/clk/rockchip/clk_rk3368.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2017 Rockchip Electronics Co., Ltd
  * Author: Andy Yan <andy.yan@rock-chips.com>
  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
  * SPDX-License-Identifier:	GPL-2.0
  */

 #include <common.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <dt-structs.h>
 #include <errno.h>
 #include <mapmem.h>
 #include <syscon.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/cru_rk3368.h>
 #include <asm/arch/hardware.h>
 #include <asm/io.h>
 #include <dm/lists.h>
 #include <dt-bindings/clock/rk3368-cru.h>

 DECLARE_GLOBAL_DATA_PTR;

 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 struct rk3368_clk_plat {
 	struct dtd_rockchip_rk3368_cru dtd;
 };
 #endif

 struct pll_div {
 	u32 nr;
 	u32 nf;
 	u32 no;
 };

 #define OSC_HZ		(24 * 1000 * 1000)
 #define APLL_L_HZ	(800 * 1000 * 1000)
 #define APLL_B_HZ	(816 * 1000 * 1000)
 #define GPLL_HZ		(576 * 1000 * 1000)
 #define CPLL_HZ		(400 * 1000 * 1000)

 #define DIV_TO_RATE(input_rate, div)    ((input_rate) / ((div) + 1))

 #define PLL_DIVISORS(hz, _nr, _no) { \
 	.nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no}; \
 	_Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\
 		       (_nr * _no) == hz, #hz "Hz cannot be hit with PLL " \
 		       "divisors on line " __stringify(__LINE__));

 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
 static const struct pll_div apll_l_init_cfg = PLL_DIVISORS(APLL_L_HZ, 12, 2);
 static const struct pll_div apll_b_init_cfg = PLL_DIVISORS(APLL_B_HZ, 1, 2);
 #if !defined(CONFIG_TPL_BUILD)
 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 1, 2);
 static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 6);
 #endif
 #endif

 static ulong rk3368_clk_get_rate(struct clk *clk);

 /* Get pll rate by id */
 static uint32_t rkclk_pll_get_rate(struct rk3368_cru *cru,
 				   enum rk3368_pll_id pll_id)
 {
 	uint32_t nr, no, nf;
 	uint32_t con;
 	struct rk3368_pll *pll = &cru->pll[pll_id];

 	con = readl(&pll->con3);

 	switch ((con & PLL_MODE_MASK) >> PLL_MODE_SHIFT) {
 	case PLL_MODE_SLOW:
 		return OSC_HZ;
 	case PLL_MODE_NORMAL:
 		con = readl(&pll->con0);
 		no = ((con & PLL_OD_MASK) >> PLL_OD_SHIFT) + 1;
 		nr = ((con & PLL_NR_MASK) >> PLL_NR_SHIFT) + 1;
 		con = readl(&pll->con1);
 		nf = ((con & PLL_NF_MASK) >> PLL_NF_SHIFT) + 1;

 		return (24 * nf / (nr * no)) * 1000000;
 	case PLL_MODE_DEEP_SLOW:
 	default:
 		return 32768;
 	}
 }

 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
 static int rkclk_set_pll(struct rk3368_cru *cru, enum rk3368_pll_id pll_id,
 			 const struct pll_div *div)
 {
 	struct rk3368_pll *pll = &cru->pll[pll_id];
 	/* All PLLs have same VCO and output frequency range restrictions*/
 	uint vco_hz = OSC_HZ / 1000 * div->nf / div->nr * 1000;
 	uint output_hz = vco_hz / div->no;

 	debug("PLL at %p: nf=%d, nr=%d, no=%d, vco=%u Hz, output=%u Hz\n",
 	      pll, div->nf, div->nr, div->no, vco_hz, output_hz);

 	/* enter slow mode and reset pll */
 	rk_clrsetreg(&pll->con3, PLL_MODE_MASK | PLL_RESET_MASK,
 		     PLL_RESET << PLL_RESET_SHIFT);

 	rk_clrsetreg(&pll->con0, PLL_NR_MASK | PLL_OD_MASK,
 		     ((div->nr - 1) << PLL_NR_SHIFT) |
 		     ((div->no - 1) << PLL_OD_SHIFT));
 	writel((div->nf - 1) << PLL_NF_SHIFT, &pll->con1);
 	/*
 	 * BWADJ should be set to NF / 2 to ensure the nominal bandwidth.
 	 * Compare the RK3368 TRM, section "3.6.4 PLL Bandwidth Adjustment".
 	 */
 	clrsetbits_le32(&pll->con2, PLL_BWADJ_MASK, (div->nf >> 1) - 1);

 	udelay(10);

 	/* return from reset */
 	rk_clrreg(&pll->con3, PLL_RESET_MASK);

 	/* waiting for pll lock */
 	while (!(readl(&pll->con1) & PLL_LOCK_STA))
 		udelay(1);

 	rk_clrsetreg(&pll->con3, PLL_MODE_MASK,
 		     PLL_MODE_NORMAL << PLL_MODE_SHIFT);

 	return 0;
 }
 #endif

 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
 static void rkclk_init(struct rk3368_cru *cru)
 {
 	u32 apllb, aplll, dpll, cpll, gpll;

 	rkclk_set_pll(cru, APLLB, &apll_b_init_cfg);
 	rkclk_set_pll(cru, APLLL, &apll_l_init_cfg);
 #if !defined(CONFIG_TPL_BUILD)
 	/*
 	 * If we plan to return to the boot ROM, we can't increase the
 	 * GPLL rate from the SPL stage.
 	 */
 	rkclk_set_pll(cru, GPLL, &gpll_init_cfg);
 	rkclk_set_pll(cru, CPLL, &cpll_init_cfg);
 #endif

 	apllb = rkclk_pll_get_rate(cru, APLLB);
 	aplll = rkclk_pll_get_rate(cru, APLLL);
 	dpll = rkclk_pll_get_rate(cru, DPLL);
 	cpll = rkclk_pll_get_rate(cru, CPLL);
 	gpll = rkclk_pll_get_rate(cru, GPLL);

 	debug("%s apllb(%d) apll(%d) dpll(%d) cpll(%d) gpll(%d)\n",
 	       __func__, apllb, aplll, dpll, cpll, gpll);
 }
 #endif

 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
 static ulong rk3368_mmc_get_clk(struct rk3368_cru *cru, uint clk_id)
 {
 	u32 div, con, con_id, rate;
 	u32 pll_rate;

 	switch (clk_id) {
 	case HCLK_SDMMC:
 		con_id = 50;
 		break;
 	case HCLK_EMMC:
 		con_id = 51;
 		break;
 	case SCLK_SDIO0:
 		con_id = 48;
 		break;
 	default:
 		return -EINVAL;
 	}

 	con = readl(&cru->clksel_con[con_id]);
 	switch (con & MMC_PLL_SEL_MASK) {
 	case MMC_PLL_SEL_GPLL:
 		pll_rate = rkclk_pll_get_rate(cru, GPLL);
 		break;
 	case MMC_PLL_SEL_24M:
 		pll_rate = OSC_HZ;
 		break;
 	case MMC_PLL_SEL_CPLL:
 		pll_rate = rkclk_pll_get_rate(cru, CPLL);
 		break;
 	case MMC_PLL_SEL_USBPHY_480M:
 	default:
 		return -EINVAL;
 	}
 	div = (con & MMC_CLK_DIV_MASK) >> MMC_CLK_DIV_SHIFT;
 	rate = DIV_TO_RATE(pll_rate, div);

 	debug("%s: raw rate %d (post-divide by 2)\n", __func__, rate);
 	return rate >> 1;
 }

 static ulong rk3368_mmc_find_best_rate_and_parent(struct clk *clk,
 						  ulong rate,
 						  u32 *best_mux,
 						  u32 *best_div)
 {
 	int i;
 	ulong best_rate = 0;
 	const ulong MHz = 1000000;
 	const struct {
 		u32 mux;
 		ulong rate;
 	} parents[] = {
 		{ .mux = MMC_PLL_SEL_CPLL, .rate = CPLL_HZ },
 		{ .mux = MMC_PLL_SEL_GPLL, .rate = GPLL_HZ },
 		{ .mux = MMC_PLL_SEL_24M,  .rate = 24 * MHz }
 	};

 	debug("%s: target rate %ld\n", __func__, rate);
 	for (i = 0; i < ARRAY_SIZE(parents); ++i) {
 		/*
 		 * Find the largest rate no larger than the target-rate for
 		 * the current parent.
 		 */
 		ulong parent_rate = parents[i].rate;
 		u32 div = DIV_ROUND_UP(parent_rate, rate);
 		u32 adj_div = div;
 		ulong new_rate = parent_rate / adj_div;

 		debug("%s: rate %ld, parent-mux %d, parent-rate %ld, div %d\n",
 		      __func__, rate, parents[i].mux, parents[i].rate, div);

 		/* Skip, if not representable */
 		if ((div - 1) > MMC_CLK_DIV_MASK)
 			continue;

 		/* Skip, if we already have a better (or equal) solution */
 		if (new_rate <= best_rate)
 			continue;

 		/* This is our new best rate. */
 		best_rate = new_rate;
 		*best_mux = parents[i].mux;
 		*best_div = div - 1;
 	}

 	debug("%s: best_mux = %x, best_div = %d, best_rate = %ld\n",
 	      __func__, *best_mux, *best_div, best_rate);

 	return best_rate;
 }

 static ulong rk3368_mmc_set_clk(struct clk *clk, ulong rate)
 {
 	struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
 	struct rk3368_cru *cru = priv->cru;
 	ulong clk_id = clk->id;
 	u32 con_id, mux = 0, div = 0;

 	/* Find the best parent and rate */
 	rk3368_mmc_find_best_rate_and_parent(clk, rate << 1, &mux, &div);

 	switch (clk_id) {
 	case HCLK_SDMMC:
 		con_id = 50;
 		break;
 	case HCLK_EMMC:
 		con_id = 51;
 		break;
 	case SCLK_SDIO0:
 		con_id = 48;
 		break;
 	default:
 		return -EINVAL;
 	}

 	rk_clrsetreg(&cru->clksel_con[con_id],
 		     MMC_PLL_SEL_MASK | MMC_CLK_DIV_MASK,
 		     mux | div);

 	return rk3368_mmc_get_clk(cru, clk_id);
 }
 #endif

 #if IS_ENABLED(CONFIG_TPL_BUILD)
 static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate)
 {
 	const struct pll_div *dpll_cfg = NULL;
 	const ulong MHz = 1000000;

 	/* Fout = ((Fin /NR) * NF )/ NO */
 	static const struct pll_div dpll_1200 = PLL_DIVISORS(1200 * MHz, 1, 1);
 	static const struct pll_div dpll_1332 =	PLL_DIVISORS(1332 * MHz, 2, 1);
 	static const struct pll_div dpll_1600 =	PLL_DIVISORS(1600 * MHz, 3, 2);

 	switch (set_rate) {
 	case 1200*MHz:
 		dpll_cfg = &dpll_1200;
 		break;
 	case 1332*MHz:
 		dpll_cfg = &dpll_1332;
 		break;
 	case 1600*MHz:
 		dpll_cfg = &dpll_1600;
 		break;
 	default:
 		error("Unsupported SDRAM frequency!,%ld\n", set_rate);
 	}
 	rkclk_set_pll(cru, DPLL, dpll_cfg);

 	return set_rate;
 }
 #endif

 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
 static ulong rk3368_gmac_set_clk(struct rk3368_cru *cru,
 				 ulong clk_id, ulong set_rate)
 {
 	/*
 	 * This models the 'assigned-clock-parents = <&ext_gmac>' from
 	 * the DTS and switches to the 'ext_gmac' clock parent.
 	 */
 	rk_setreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
 	return set_rate;
 }
 #endif

 /*
  * RK3368 SPI clocks have a common divider-width (7 bits) and a single bit
  * to select either CPLL or GPLL as the clock-parent. The location within
  * the enclosing CLKSEL_CON (i.e. div_shift and sel_shift) are variable.
  */

 struct spi_clkreg {
 	uint8_t reg;  /* CLKSEL_CON[reg] register in CRU */
 	uint8_t div_shift;
 	uint8_t sel_shift;
 };

 /*
  * The entries are numbered relative to their offset from SCLK_SPI0.
  */
 static const struct spi_clkreg spi_clkregs[] = {
 	[0] = { .reg = 45, .div_shift = 0, .sel_shift = 7, },
 	[1] = { .reg = 45, .div_shift = 8, .sel_shift = 15, },
 	[2] = { .reg = 46, .div_shift = 8, .sel_shift = 15, },
 };

 static inline u32 extract_bits(u32 val, unsigned width, unsigned shift)
 {
 	return (val >> shift) & ((1 << width) - 1);
 }

 static ulong rk3368_spi_get_clk(struct rk3368_cru *cru, ulong clk_id)
 {
 	const struct spi_clkreg *spiclk = NULL;
 	u32 div, val;

 	switch (clk_id) {
 	case SCLK_SPI0 ... SCLK_SPI2:
 		spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
 		break;

 	default:
 		error("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
 		return -EINVAL;
 	}

 	val = readl(&cru->clksel_con[spiclk->reg]);
 	div = extract_bits(val, 7, spiclk->div_shift);

 	debug("%s: div 0x%x\n", __func__, div);
 	return DIV_TO_RATE(GPLL_HZ, div);
 }

 static ulong rk3368_spi_set_clk(struct rk3368_cru *cru, ulong clk_id, uint hz)
 {
 	const struct spi_clkreg *spiclk = NULL;
 	int src_clk_div;

 	src_clk_div = DIV_ROUND_UP(GPLL_HZ, hz);
 	assert(src_clk_div < 127);

 	switch (clk_id) {
 	case SCLK_SPI0 ... SCLK_SPI2:
 		spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
 		break;

 	default:
 		error("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
 		return -EINVAL;
 	}

 	rk_clrsetreg(&cru->clksel_con[spiclk->reg],
 		     ((0x7f << spiclk->div_shift) |
 		      (0x1 << spiclk->sel_shift)),
 		     ((src_clk_div << spiclk->div_shift) |
 		      (1 << spiclk->sel_shift)));

 	return rk3368_spi_get_clk(cru, clk_id);
 }

 static ulong rk3368_clk_get_rate(struct clk *clk)
 {
 	struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
 	ulong rate = 0;

 	debug("%s: id %ld\n", __func__, clk->id);
 	switch (clk->id) {
 	case PLL_CPLL:
 		rate = rkclk_pll_get_rate(priv->cru, CPLL);
 		break;
 	case PLL_GPLL:
 		rate = rkclk_pll_get_rate(priv->cru, GPLL);
 		break;
 	case SCLK_SPI0 ... SCLK_SPI2:
 		rate = rk3368_spi_get_clk(priv->cru, clk->id);
 		break;
 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
 	case HCLK_SDMMC:
 	case HCLK_EMMC:
 		rate = rk3368_mmc_get_clk(priv->cru, clk->id);
 		break;
 #endif
 	default:
 		return -ENOENT;
 	}

 	return rate;
 }

 static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate)
 {
 	__maybe_unused struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
 	ulong ret = 0;

 	debug("%s id:%ld rate:%ld\n", __func__, clk->id, rate);
 	switch (clk->id) {
 	case SCLK_SPI0 ... SCLK_SPI2:
 		ret = rk3368_spi_set_clk(priv->cru, clk->id, rate);
 		break;
 #if IS_ENABLED(CONFIG_TPL_BUILD)
 	case CLK_DDR:
 		ret = rk3368_ddr_set_clk(priv->cru, rate);
 		break;
 #endif
 #if !IS_ENABLED(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(MMC_SUPPORT)
 	case HCLK_SDMMC:
 	case HCLK_EMMC:
 		ret = rk3368_mmc_set_clk(clk, rate);
 		break;
 #endif
 #if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
 	case SCLK_MAC:
 		/* select the external clock */
 		ret = rk3368_gmac_set_clk(priv->cru, clk->id, rate);
 		break;
 #endif
 	default:
 		return -ENOENT;
 	}

 	return ret;
 }

 static struct clk_ops rk3368_clk_ops = {
 	.get_rate = rk3368_clk_get_rate,
 	.set_rate = rk3368_clk_set_rate,
 };

 static int rk3368_clk_probe(struct udevice *dev)
 {
 	struct rk3368_clk_priv __maybe_unused *priv = dev_get_priv(dev);
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 	struct rk3368_clk_plat *plat = dev_get_platdata(dev);

 	priv->cru = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
 #endif
 #if IS_ENABLED(CONFIG_SPL_BUILD) || IS_ENABLED(CONFIG_TPL_BUILD)
 	rkclk_init(priv->cru);
 #endif

 	return 0;
 }

 static int rk3368_clk_ofdata_to_platdata(struct udevice *dev)
 {
 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 	struct rk3368_clk_priv *priv = dev_get_priv(dev);

 	priv->cru = dev_read_addr_ptr(dev);
 #endif

 	return 0;
 }

 static int rk3368_clk_bind(struct udevice *dev)
 {
 	int ret;

 	/* The reset driver does not have a device node, so bind it here */
 	ret = device_bind_driver(gd->dm_root, "rk3368_sysreset", "reset", &dev);
 	if (ret)
 		error("bind RK3368 reset driver failed: ret=%d\n", ret);

 	return ret;
 }

 static const struct udevice_id rk3368_clk_ids[] = {
 	{ .compatible = "rockchip,rk3368-cru" },
 	{ }
 };

 U_BOOT_DRIVER(rockchip_rk3368_cru) = {
 	.name		= "rockchip_rk3368_cru",
 	.id		= UCLASS_CLK,
 	.of_match	= rk3368_clk_ids,
 	.priv_auto_alloc_size = sizeof(struct rk3368_clk_priv),
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 	.platdata_auto_alloc_size = sizeof(struct rk3368_clk_plat),
 #endif
 	.ofdata_to_platdata = rk3368_clk_ofdata_to_platdata,
 	.ops		= &rk3368_clk_ops,
 	.bind		= rk3368_clk_bind,
 	.probe		= rk3368_clk_probe,
 };
	/*
	* (C) Copyright 2017 Rockchip Electronics Co., Ltd
	* Author: Andy Yan <andy.yan@rock-chips.com>
	* (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
	* SPDX-License-Identifier: GPL-2.0
	*/

	#include <common.h>
	#include <clk-uclass.h>
	#include <dm.h>
	#include <dt-structs.h>
	#include <errno.h>
	#include <mapmem.h>
	#include <syscon.h>
	#include <asm/arch/clock.h>
	#include <asm/arch/cru_rk3368.h>
	#include <asm/arch/hardware.h>
	#include <asm/io.h>
	#include <dm/lists.h>
	#include <dt-bindings/clock/rk3368-cru.h>

	DECLARE_GLOBAL_DATA_PTR;

	#if CONFIG_IS_ENABLED(OF_PLATDATA)
	struct rk3368_clk_plat {
	struct dtd_rockchip_rk3368_cru dtd;
	};
	#endif

	struct pll_div {
	u32 nr;
	u32 nf;
	u32 no;
	};

	#define OSC_HZ (24 * 1000 * 1000)
	#define APLL_L_HZ (800 * 1000 * 1000)
	#define APLL_B_HZ (816 * 1000 * 1000)
	#define GPLL_HZ (576 * 1000 * 1000)
	#define CPLL_HZ (400 * 1000 * 1000)

	#define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))

	#define PLL_DIVISORS(hz, _nr, _no) { \
	.nr = _nr, .nf = (u32)((u64)hz * _nr * _no / OSC_HZ), .no = _no}; \
	_Static_assert(((u64)hz * _nr * _no / OSC_HZ) * OSC_HZ /\
	(_nr * _no) == hz, #hz "Hz cannot be hit with PLL " \
	"divisors on line " __stringify(__LINE__));

	#if IS_ENABLED(CONFIG_SPL_BUILD) \|\| IS_ENABLED(CONFIG_TPL_BUILD)
	static const struct pll_div apll_l_init_cfg = PLL_DIVISORS(APLL_L_HZ, 12, 2);
	static const struct pll_div apll_b_init_cfg = PLL_DIVISORS(APLL_B_HZ, 1, 2);
	#if !defined(CONFIG_TPL_BUILD)
	static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 1, 2);
	static const struct pll_div cpll_init_cfg = PLL_DIVISORS(CPLL_HZ, 1, 6);
	#endif
	#endif

	static ulong rk3368_clk_get_rate(struct clk *clk);

	/* Get pll rate by id */
	static uint32_t rkclk_pll_get_rate(struct rk3368_cru *cru,
	enum rk3368_pll_id pll_id)
	{
	uint32_t nr, no, nf;
	uint32_t con;
	struct rk3368_pll *pll = &cru->pll[pll_id];

	con = readl(&pll->con3);

	switch ((con & PLL_MODE_MASK) >> PLL_MODE_SHIFT) {
	case PLL_MODE_SLOW:
	return OSC_HZ;
	case PLL_MODE_NORMAL:
	con = readl(&pll->con0);
	no = ((con & PLL_OD_MASK) >> PLL_OD_SHIFT) + 1;
	nr = ((con & PLL_NR_MASK) >> PLL_NR_SHIFT) + 1;
	con = readl(&pll->con1);
	nf = ((con & PLL_NF_MASK) >> PLL_NF_SHIFT) + 1;

	return (24 * nf / (nr * no)) * 1000000;
	case PLL_MODE_DEEP_SLOW:
	default:
	return 32768;
	}
	}

	#if IS_ENABLED(CONFIG_SPL_BUILD) \|\| IS_ENABLED(CONFIG_TPL_BUILD)
	static int rkclk_set_pll(struct rk3368_cru *cru, enum rk3368_pll_id pll_id,
	const struct pll_div *div)
	{
	struct rk3368_pll *pll = &cru->pll[pll_id];
	/* All PLLs have same VCO and output frequency range restrictions*/
	uint vco_hz = OSC_HZ / 1000 * div->nf / div->nr * 1000;
	uint output_hz = vco_hz / div->no;

	debug("PLL at %p: nf=%d, nr=%d, no=%d, vco=%u Hz, output=%u Hz\n",
	pll, div->nf, div->nr, div->no, vco_hz, output_hz);

	/* enter slow mode and reset pll */
	rk_clrsetreg(&pll->con3, PLL_MODE_MASK \| PLL_RESET_MASK,
	PLL_RESET << PLL_RESET_SHIFT);

	rk_clrsetreg(&pll->con0, PLL_NR_MASK \| PLL_OD_MASK,
	((div->nr - 1) << PLL_NR_SHIFT) \|
	((div->no - 1) << PLL_OD_SHIFT));
	writel((div->nf - 1) << PLL_NF_SHIFT, &pll->con1);
	/*
	* BWADJ should be set to NF / 2 to ensure the nominal bandwidth.
	* Compare the RK3368 TRM, section "3.6.4 PLL Bandwidth Adjustment".
	*/
	clrsetbits_le32(&pll->con2, PLL_BWADJ_MASK, (div->nf >> 1) - 1);

	udelay(10);

	/* return from reset */
	rk_clrreg(&pll->con3, PLL_RESET_MASK);

	/* waiting for pll lock */
	while (!(readl(&pll->con1) & PLL_LOCK_STA))
	udelay(1);

	rk_clrsetreg(&pll->con3, PLL_MODE_MASK,
	PLL_MODE_NORMAL << PLL_MODE_SHIFT);

	return 0;
	}
	#endif

	#if IS_ENABLED(CONFIG_SPL_BUILD) \|\| IS_ENABLED(CONFIG_TPL_BUILD)
	static void rkclk_init(struct rk3368_cru *cru)
	{
	u32 apllb, aplll, dpll, cpll, gpll;

	rkclk_set_pll(cru, APLLB, &apll_b_init_cfg);
	rkclk_set_pll(cru, APLLL, &apll_l_init_cfg);
	#if !defined(CONFIG_TPL_BUILD)
	/*
	* If we plan to return to the boot ROM, we can't increase the
	* GPLL rate from the SPL stage.
	*/
	rkclk_set_pll(cru, GPLL, &gpll_init_cfg);
	rkclk_set_pll(cru, CPLL, &cpll_init_cfg);
	#endif

	apllb = rkclk_pll_get_rate(cru, APLLB);
	aplll = rkclk_pll_get_rate(cru, APLLL);
	dpll = rkclk_pll_get_rate(cru, DPLL);
	cpll = rkclk_pll_get_rate(cru, CPLL);
	gpll = rkclk_pll_get_rate(cru, GPLL);

	debug("%s apllb(%d) apll(%d) dpll(%d) cpll(%d) gpll(%d)\n",
	__func__, apllb, aplll, dpll, cpll, gpll);
	}
	#endif

	#if !IS_ENABLED(CONFIG_SPL_BUILD) \|\| CONFIG_IS_ENABLED(MMC_SUPPORT)
	static ulong rk3368_mmc_get_clk(struct rk3368_cru *cru, uint clk_id)
	{
	u32 div, con, con_id, rate;
	u32 pll_rate;

	switch (clk_id) {
	case HCLK_SDMMC:
	con_id = 50;
	break;
	case HCLK_EMMC:
	con_id = 51;
	break;
	case SCLK_SDIO0:
	con_id = 48;
	break;
	default:
	return -EINVAL;
	}

	con = readl(&cru->clksel_con[con_id]);
	switch (con & MMC_PLL_SEL_MASK) {
	case MMC_PLL_SEL_GPLL:
	pll_rate = rkclk_pll_get_rate(cru, GPLL);
	break;
	case MMC_PLL_SEL_24M:
	pll_rate = OSC_HZ;
	break;
	case MMC_PLL_SEL_CPLL:
	pll_rate = rkclk_pll_get_rate(cru, CPLL);
	break;
	case MMC_PLL_SEL_USBPHY_480M:
	default:
	return -EINVAL;
	}
	div = (con & MMC_CLK_DIV_MASK) >> MMC_CLK_DIV_SHIFT;
	rate = DIV_TO_RATE(pll_rate, div);

	debug("%s: raw rate %d (post-divide by 2)\n", __func__, rate);
	return rate >> 1;
	}

	static ulong rk3368_mmc_find_best_rate_and_parent(struct clk *clk,
	ulong rate,
	u32 *best_mux,
	u32 *best_div)
	{
	int i;
	ulong best_rate = 0;
	const ulong MHz = 1000000;
	const struct {
	u32 mux;
	ulong rate;
	} parents[] = {
	{ .mux = MMC_PLL_SEL_CPLL, .rate = CPLL_HZ },
	{ .mux = MMC_PLL_SEL_GPLL, .rate = GPLL_HZ },
	{ .mux = MMC_PLL_SEL_24M, .rate = 24 * MHz }
	};

	debug("%s: target rate %ld\n", __func__, rate);
	for (i = 0; i < ARRAY_SIZE(parents); ++i) {
	/*
	* Find the largest rate no larger than the target-rate for
	* the current parent.
	*/
	ulong parent_rate = parents[i].rate;
	u32 div = DIV_ROUND_UP(parent_rate, rate);
	u32 adj_div = div;
	ulong new_rate = parent_rate / adj_div;

	debug("%s: rate %ld, parent-mux %d, parent-rate %ld, div %d\n",
	__func__, rate, parents[i].mux, parents[i].rate, div);

	/* Skip, if not representable */
	if ((div - 1) > MMC_CLK_DIV_MASK)
	continue;

	/* Skip, if we already have a better (or equal) solution */
	if (new_rate <= best_rate)
	continue;

	/* This is our new best rate. */
	best_rate = new_rate;
	*best_mux = parents[i].mux;
	*best_div = div - 1;
	}

	debug("%s: best_mux = %x, best_div = %d, best_rate = %ld\n",
	__func__, best_mux, best_div, best_rate);

	return best_rate;
	}

	static ulong rk3368_mmc_set_clk(struct clk *clk, ulong rate)
	{
	struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
	struct rk3368_cru *cru = priv->cru;
	ulong clk_id = clk->id;
	u32 con_id, mux = 0, div = 0;

	/* Find the best parent and rate */
	rk3368_mmc_find_best_rate_and_parent(clk, rate << 1, &mux, &div);

	switch (clk_id) {
	case HCLK_SDMMC:
	con_id = 50;
	break;
	case HCLK_EMMC:
	con_id = 51;
	break;
	case SCLK_SDIO0:
	con_id = 48;
	break;
	default:
	return -EINVAL;
	}

	rk_clrsetreg(&cru->clksel_con[con_id],
	MMC_PLL_SEL_MASK \| MMC_CLK_DIV_MASK,
	mux \| div);

	return rk3368_mmc_get_clk(cru, clk_id);
	}
	#endif

	#if IS_ENABLED(CONFIG_TPL_BUILD)
	static ulong rk3368_ddr_set_clk(struct rk3368_cru *cru, ulong set_rate)
	{
	const struct pll_div *dpll_cfg = NULL;
	const ulong MHz = 1000000;

	/* Fout = ((Fin /NR) * NF )/ NO */
	static const struct pll_div dpll_1200 = PLL_DIVISORS(1200 * MHz, 1, 1);
	static const struct pll_div dpll_1332 = PLL_DIVISORS(1332 * MHz, 2, 1);
	static const struct pll_div dpll_1600 = PLL_DIVISORS(1600 * MHz, 3, 2);

	switch (set_rate) {
	case 1200*MHz:
	dpll_cfg = &dpll_1200;
	break;
	case 1332*MHz:
	dpll_cfg = &dpll_1332;
	break;
	case 1600*MHz:
	dpll_cfg = &dpll_1600;
	break;
	default:
	error("Unsupported SDRAM frequency!,%ld\n", set_rate);
	}
	rkclk_set_pll(cru, DPLL, dpll_cfg);

	return set_rate;
	}
	#endif

	#if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
	static ulong rk3368_gmac_set_clk(struct rk3368_cru *cru,
	ulong clk_id, ulong set_rate)
	{
	/*
	* This models the 'assigned-clock-parents = <&ext_gmac>' from
	* the DTS and switches to the 'ext_gmac' clock parent.
	*/
	rk_setreg(&cru->clksel_con[43], GMAC_MUX_SEL_EXTCLK);
	return set_rate;
	}
	#endif

	/*
	* RK3368 SPI clocks have a common divider-width (7 bits) and a single bit
	* to select either CPLL or GPLL as the clock-parent. The location within
	* the enclosing CLKSEL_CON (i.e. div_shift and sel_shift) are variable.
	*/

	struct spi_clkreg {
	uint8_t reg; /* CLKSEL_CON[reg] register in CRU */
	uint8_t div_shift;
	uint8_t sel_shift;
	};

	/*
	* The entries are numbered relative to their offset from SCLK_SPI0.
	*/
	static const struct spi_clkreg spi_clkregs[] = {
	[0] = { .reg = 45, .div_shift = 0, .sel_shift = 7, },
	[1] = { .reg = 45, .div_shift = 8, .sel_shift = 15, },
	[2] = { .reg = 46, .div_shift = 8, .sel_shift = 15, },
	};

	static inline u32 extract_bits(u32 val, unsigned width, unsigned shift)
	{
	return (val >> shift) & ((1 << width) - 1);
	}

	static ulong rk3368_spi_get_clk(struct rk3368_cru *cru, ulong clk_id)
	{
	const struct spi_clkreg *spiclk = NULL;
	u32 div, val;

	switch (clk_id) {
	case SCLK_SPI0 ... SCLK_SPI2:
	spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
	break;

	default:
	error("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
	return -EINVAL;
	}

	val = readl(&cru->clksel_con[spiclk->reg]);
	div = extract_bits(val, 7, spiclk->div_shift);

	debug("%s: div 0x%x\n", __func__, div);
	return DIV_TO_RATE(GPLL_HZ, div);
	}

	static ulong rk3368_spi_set_clk(struct rk3368_cru *cru, ulong clk_id, uint hz)
	{
	const struct spi_clkreg *spiclk = NULL;
	int src_clk_div;

	src_clk_div = DIV_ROUND_UP(GPLL_HZ, hz);
	assert(src_clk_div < 127);

	switch (clk_id) {
	case SCLK_SPI0 ... SCLK_SPI2:
	spiclk = &spi_clkregs[clk_id - SCLK_SPI0];
	break;

	default:
	error("%s: SPI clk-id %ld not supported\n", __func__, clk_id);
	return -EINVAL;
	}

	rk_clrsetreg(&cru->clksel_con[spiclk->reg],
	((0x7f << spiclk->div_shift) \|
	(0x1 << spiclk->sel_shift)),
	((src_clk_div << spiclk->div_shift) \|
	(1 << spiclk->sel_shift)));

	return rk3368_spi_get_clk(cru, clk_id);
	}

	static ulong rk3368_clk_get_rate(struct clk *clk)
	{
	struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
	ulong rate = 0;

	debug("%s: id %ld\n", __func__, clk->id);
	switch (clk->id) {
	case PLL_CPLL:
	rate = rkclk_pll_get_rate(priv->cru, CPLL);
	break;
	case PLL_GPLL:
	rate = rkclk_pll_get_rate(priv->cru, GPLL);
	break;
	case SCLK_SPI0 ... SCLK_SPI2:
	rate = rk3368_spi_get_clk(priv->cru, clk->id);
	break;
	#if !IS_ENABLED(CONFIG_SPL_BUILD) \|\| CONFIG_IS_ENABLED(MMC_SUPPORT)
	case HCLK_SDMMC:
	case HCLK_EMMC:
	rate = rk3368_mmc_get_clk(priv->cru, clk->id);
	break;
	#endif
	default:
	return -ENOENT;
	}

	return rate;
	}

	static ulong rk3368_clk_set_rate(struct clk *clk, ulong rate)
	{
	__maybe_unused struct rk3368_clk_priv *priv = dev_get_priv(clk->dev);
	ulong ret = 0;

	debug("%s id:%ld rate:%ld\n", __func__, clk->id, rate);
	switch (clk->id) {
	case SCLK_SPI0 ... SCLK_SPI2:
	ret = rk3368_spi_set_clk(priv->cru, clk->id, rate);
	break;
	#if IS_ENABLED(CONFIG_TPL_BUILD)
	case CLK_DDR:
	ret = rk3368_ddr_set_clk(priv->cru, rate);
	break;
	#endif
	#if !IS_ENABLED(CONFIG_SPL_BUILD) \|\| CONFIG_IS_ENABLED(MMC_SUPPORT)
	case HCLK_SDMMC:
	case HCLK_EMMC:
	ret = rk3368_mmc_set_clk(clk, rate);
	break;
	#endif
	#if CONFIG_IS_ENABLED(GMAC_ROCKCHIP)
	case SCLK_MAC:
	/* select the external clock */
	ret = rk3368_gmac_set_clk(priv->cru, clk->id, rate);
	break;
	#endif
	default:
	return -ENOENT;
	}

	return ret;
	}

	static struct clk_ops rk3368_clk_ops = {
	.get_rate = rk3368_clk_get_rate,
	.set_rate = rk3368_clk_set_rate,
	};

	static int rk3368_clk_probe(struct udevice *dev)
	{
	struct rk3368_clk_priv __maybe_unused *priv = dev_get_priv(dev);
	#if CONFIG_IS_ENABLED(OF_PLATDATA)
	struct rk3368_clk_plat *plat = dev_get_platdata(dev);

	priv->cru = map_sysmem(plat->dtd.reg[0], plat->dtd.reg[1]);
	#endif
	#if IS_ENABLED(CONFIG_SPL_BUILD) \|\| IS_ENABLED(CONFIG_TPL_BUILD)
	rkclk_init(priv->cru);
	#endif

	return 0;
	}

	static int rk3368_clk_ofdata_to_platdata(struct udevice *dev)
	{
	#if !CONFIG_IS_ENABLED(OF_PLATDATA)
	struct rk3368_clk_priv *priv = dev_get_priv(dev);

	priv->cru = dev_read_addr_ptr(dev);
	#endif

	return 0;
	}

	static int rk3368_clk_bind(struct udevice *dev)
	{
	int ret;

	/* The reset driver does not have a device node, so bind it here */
	ret = device_bind_driver(gd->dm_root, "rk3368_sysreset", "reset", &dev);
	if (ret)
	error("bind RK3368 reset driver failed: ret=%d\n", ret);

	return ret;
	}

	static const struct udevice_id rk3368_clk_ids[] = {
	{ .compatible = "rockchip,rk3368-cru" },
	{ }
	};

	U_BOOT_DRIVER(rockchip_rk3368_cru) = {
	.name = "rockchip_rk3368_cru",
	.id = UCLASS_CLK,
	.of_match = rk3368_clk_ids,
	.priv_auto_alloc_size = sizeof(struct rk3368_clk_priv),
	#if CONFIG_IS_ENABLED(OF_PLATDATA)
	.platdata_auto_alloc_size = sizeof(struct rk3368_clk_plat),
	#endif
	.ofdata_to_platdata = rk3368_clk_ofdata_to_platdata,
	.ops = &rk3368_clk_ops,
	.bind = rk3368_clk_bind,
	.probe = rk3368_clk_probe,
	};