drivers/clk/rockchip/clk_rk3128.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * (C) Copyright 2017 Rockchip Electronics Co., Ltd
  */

 #include <common.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <errno.h>
 #include <log.h>
 #include <malloc.h>
 #include <syscon.h>
 #include <asm/io.h>
 #include <asm/arch-rockchip/clock.h>
 #include <asm/arch-rockchip/cru_rk3128.h>
 #include <asm/arch-rockchip/hardware.h>
 #include <bitfield.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dt-bindings/clock/rk3128-cru.h>
 #include <linux/delay.h>
 #include <linux/log2.h>

 enum {
 	VCO_MAX_HZ	= 2400U * 1000000,
 	VCO_MIN_HZ	= 600 * 1000000,
 	OUTPUT_MAX_HZ	= 2400U * 1000000,
 	OUTPUT_MIN_HZ	= 24 * 1000000,
 };

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

 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
 	.refdiv = _refdiv,\
 	.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
 	.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};

 /* use integer mode*/
 static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);

 static int rkclk_set_pll(struct rk3128_cru *cru, enum rk_clk_id clk_id,
 			 const struct pll_div *div)
 {
 	int pll_id = rk_pll_id(clk_id);
 	struct rk3128_pll *pll = &cru->pll[pll_id];

 	/* All PLLs have same VCO and output frequency range restrictions. */
 	uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
 	uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;

 	debug("PLL at %p:fd=%d,rd=%d,pd1=%d,pd2=%d,vco=%uHz,output=%uHz\n",
 	      pll, div->fbdiv, div->refdiv, div->postdiv1,
 	      div->postdiv2, vco_hz, output_hz);
 	assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
 	       output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);

 	/* use integer mode */
 	rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
 	/* Power down */
 	rk_setreg(&pll->con1, 1 << PLL_PD_SHIFT);

 	rk_clrsetreg(&pll->con0,
 		     PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
 		     (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
 	rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
 		     (div->postdiv2 << PLL_POSTDIV2_SHIFT |
 		     div->refdiv << PLL_REFDIV_SHIFT));

 	/* Power Up */
 	rk_clrreg(&pll->con1, 1 << PLL_PD_SHIFT);

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

 	return 0;
 }

 static int pll_para_config(u32 freq_hz, struct pll_div *div)
 {
 	u32 ref_khz = OSC_HZ / 1000, refdiv, fbdiv = 0;
 	u32 postdiv1, postdiv2 = 1;
 	u32 fref_khz;
 	u32 diff_khz, best_diff_khz;
 	const u32 max_refdiv = 63, max_fbdiv = 3200, min_fbdiv = 16;
 	const u32 max_postdiv1 = 7, max_postdiv2 = 7;
 	u32 vco_khz;
 	u32 freq_khz = freq_hz / 1000;

 	if (!freq_hz) {
 		printf("%s: the frequency can't be 0 Hz\n", __func__);
 		return -1;
 	}

 	postdiv1 = DIV_ROUND_UP(VCO_MIN_HZ / 1000, freq_khz);
 	if (postdiv1 > max_postdiv1) {
 		postdiv2 = DIV_ROUND_UP(postdiv1, max_postdiv1);
 		postdiv1 = DIV_ROUND_UP(postdiv1, postdiv2);
 	}

 	vco_khz = freq_khz * postdiv1 * postdiv2;

 	if (vco_khz < (VCO_MIN_HZ / 1000) || vco_khz > (VCO_MAX_HZ / 1000) ||
 	    postdiv2 > max_postdiv2) {
 		printf("%s: Cannot find out a supported VCO for Freq (%uHz)\n",
 		       __func__, freq_hz);
 		return -1;
 	}

 	div->postdiv1 = postdiv1;
 	div->postdiv2 = postdiv2;

 	best_diff_khz = vco_khz;
 	for (refdiv = 1; refdiv < max_refdiv && best_diff_khz; refdiv++) {
 		fref_khz = ref_khz / refdiv;

 		fbdiv = vco_khz / fref_khz;
 		if ((fbdiv >= max_fbdiv) || (fbdiv <= min_fbdiv))
 			continue;
 		diff_khz = vco_khz - fbdiv * fref_khz;
 		if (fbdiv + 1 < max_fbdiv && diff_khz > fref_khz / 2) {
 			fbdiv++;
 			diff_khz = fref_khz - diff_khz;
 		}

 		if (diff_khz >= best_diff_khz)
 			continue;

 		best_diff_khz = diff_khz;
 		div->refdiv = refdiv;
 		div->fbdiv = fbdiv;
 	}

 	if (best_diff_khz > 4 * (1000)) {
 		printf("%s: Failed to match output frequency %u bestis %u Hz\n",
 		       __func__, freq_hz,
 		       best_diff_khz * 1000);
 		return -1;
 	}
 	return 0;
 }

 static void rkclk_init(struct rk3128_cru *cru)
 {
 	u32 aclk_div;
 	u32 hclk_div;
 	u32 pclk_div;

 	/* pll enter slow-mode */
 	rk_clrsetreg(&cru->cru_mode_con,
 		     GPLL_MODE_MASK | APLL_MODE_MASK,
 		     GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
 		     APLL_MODE_SLOW << APLL_MODE_SHIFT);

 	/* init pll */
 	rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
 	rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);

 	/*
 	 * select apll as cpu/core clock pll source and
 	 * set up dependent divisors for PERI and ACLK clocks.
 	 * core hz : apll = 1:1
 	 */
 	aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
 	assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);

 	pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
 	assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);

 	rk_clrsetreg(&cru->cru_clksel_con[0],
 		     CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
 		     CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
 		     0 << CORE_DIV_CON_SHIFT);

 	rk_clrsetreg(&cru->cru_clksel_con[1],
 		     CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
 		     aclk_div << CORE_ACLK_DIV_SHIFT |
 		     pclk_div << CORE_PERI_DIV_SHIFT);

 	/*
 	 * select gpll as pd_bus bus clock source and
 	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
 	 */
 	aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
 	assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);

 	pclk_div = BUS_ACLK_HZ / BUS_PCLK_HZ - 1;
 	assert((pclk_div + 1) * BUS_PCLK_HZ == BUS_ACLK_HZ && pclk_div <= 0x7);

 	hclk_div = BUS_ACLK_HZ / BUS_HCLK_HZ - 1;
 	assert((hclk_div + 1) * BUS_HCLK_HZ == BUS_ACLK_HZ && hclk_div <= 0x3);

 	rk_clrsetreg(&cru->cru_clksel_con[0],
 		     BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
 		     BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
 		     aclk_div << BUS_ACLK_DIV_SHIFT);

 	rk_clrsetreg(&cru->cru_clksel_con[1],
 		     BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
 		     pclk_div << BUS_PCLK_DIV_SHIFT |
 		     hclk_div << BUS_HCLK_DIV_SHIFT);

 	/*
 	 * select gpll as pd_peri bus clock source and
 	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
 	 */
 	aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
 	assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);

 	hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
 	assert((1 << hclk_div) * PERI_HCLK_HZ ==
 		PERI_ACLK_HZ && (hclk_div < 0x4));

 	pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
 	assert((1 << pclk_div) * PERI_PCLK_HZ ==
 		PERI_ACLK_HZ && pclk_div < 0x8);

 	rk_clrsetreg(&cru->cru_clksel_con[10],
 		     PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
 		     PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
 		     PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
 		     pclk_div << PERI_PCLK_DIV_SHIFT |
 		     hclk_div << PERI_HCLK_DIV_SHIFT |
 		     aclk_div << PERI_ACLK_DIV_SHIFT);

 	/* PLL enter normal-mode */
 	rk_clrsetreg(&cru->cru_mode_con,
 		     GPLL_MODE_MASK | APLL_MODE_MASK | CPLL_MODE_MASK,
 		     GPLL_MODE_NORM << GPLL_MODE_SHIFT |
 		     APLL_MODE_NORM << APLL_MODE_SHIFT |
 		     CPLL_MODE_NORM << CPLL_MODE_SHIFT);

 	/*fix NAND controller  working clock max to 150Mhz */
 	rk_clrsetreg(&cru->cru_clksel_con[2],
 		     NANDC_PLL_SEL_MASK | NANDC_CLK_DIV_MASK,
 		     NANDC_PLL_SEL_GPLL << NANDC_PLL_SEL_SHIFT |
 		     3 << NANDC_CLK_DIV_SHIFT);
 }

 /* Get pll rate by id */
 static u32 rkclk_pll_get_rate(struct rk3128_cru *cru,
 			      enum rk_clk_id clk_id)
 {
 	u32 refdiv, fbdiv, postdiv1, postdiv2;
 	u32 con;
 	int pll_id = rk_pll_id(clk_id);
 	struct rk3128_pll *pll = &cru->pll[pll_id];
 	static u8 clk_shift[CLK_COUNT] = {
 		0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, CPLL_MODE_SHIFT,
 		GPLL_MODE_SHIFT, 0xff
 	};
 	static u32 clk_mask[CLK_COUNT] = {
 		0xff, APLL_MODE_MASK, DPLL_MODE_MASK, CPLL_MODE_MASK,
 		GPLL_MODE_MASK, 0xff
 	};
 	uint shift;
 	uint mask;

 	con = readl(&cru->cru_mode_con);
 	shift = clk_shift[clk_id];
 	mask = clk_mask[clk_id];

 	switch ((con & mask) >> shift) {
 	case GPLL_MODE_SLOW:
 		return OSC_HZ;
 	case GPLL_MODE_NORM:
 		/* normal mode */
 		con = readl(&pll->con0);
 		postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
 		fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
 		con = readl(&pll->con1);
 		postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
 		refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
 		return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
 	case GPLL_MODE_DEEP:
 	default:
 		return 32768;
 	}
 }

 static ulong rockchip_mmc_get_clk(struct rk3128_cru *cru, uint clk_general_rate,
 				  int periph)
 {
 	uint src_rate;
 	uint div, mux;
 	u32 con;

 	switch (periph) {
 	case HCLK_EMMC:
 	case SCLK_EMMC:
 	case SCLK_EMMC_SAMPLE:
 		con = readl(&cru->cru_clksel_con[12]);
 		mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
 		div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
 		break;
 	case HCLK_SDMMC:
 	case SCLK_SDMMC:
 		con = readl(&cru->cru_clksel_con[11]);
 		mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
 		div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
 		break;
 	default:
 		return -EINVAL;
 	}

 	src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
 	return DIV_TO_RATE(src_rate, div);
 }

 static ulong rockchip_mmc_set_clk(struct rk3128_cru *cru, uint clk_general_rate,
 				  int periph, uint freq)
 {
 	int src_clk_div;
 	int mux;

 	debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);

 	/* mmc clock defaulg div 2 internal, need provide double in cru */
 	src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);

 	if (src_clk_div > 128) {
 		src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
 		mux = EMMC_SEL_24M;
 	} else {
 		mux = EMMC_SEL_GPLL;
 	}

 	switch (periph) {
 	case HCLK_EMMC:
 		rk_clrsetreg(&cru->cru_clksel_con[12],
 			     EMMC_PLL_MASK | EMMC_DIV_MASK,
 			     mux << EMMC_PLL_SHIFT |
 			     (src_clk_div - 1) << EMMC_DIV_SHIFT);
 		break;
 	case HCLK_SDMMC:
 	case SCLK_SDMMC:
 		rk_clrsetreg(&cru->cru_clksel_con[11],
 			     MMC0_PLL_MASK | MMC0_DIV_MASK,
 			     mux << MMC0_PLL_SHIFT |
 			     (src_clk_div - 1) << MMC0_DIV_SHIFT);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
 }

 static ulong rk3128_peri_get_pclk(struct rk3128_cru *cru, ulong clk_id)
 {
 	u32 div, con;

 	switch (clk_id) {
 	case PCLK_I2C0:
 	case PCLK_I2C1:
 	case PCLK_I2C2:
 	case PCLK_I2C3:
 	case PCLK_PWM:
 		con = readl(&cru->cru_clksel_con[10]);
 		div = con >> 12 & 0x3;
 		break;
 	default:
 		printf("do not support this peripheral bus\n");
 		return -EINVAL;
 	}

 	return DIV_TO_RATE(PERI_ACLK_HZ, div);
 }

 static ulong rk3128_peri_set_pclk(struct rk3128_cru *cru, ulong clk_id, uint hz)
 {
 	int src_clk_div;

 	src_clk_div = PERI_ACLK_HZ / hz;
 	assert(src_clk_div - 1 < 4);

 	switch (clk_id) {
 	case PCLK_I2C0:
 	case PCLK_I2C1:
 	case PCLK_I2C2:
 	case PCLK_I2C3:
 	case PCLK_PWM:
 		rk_setreg(&cru->cru_clksel_con[10],
 			  ((src_clk_div - 1) << 12));
 		break;
 	default:
 		printf("do not support this peripheral bus\n");
 		return -EINVAL;
 	}

 	return DIV_TO_RATE(PERI_ACLK_HZ, src_clk_div);
 }

 static ulong rk3128_saradc_get_clk(struct rk3128_cru *cru)
 {
 	u32 div, val;

 	val = readl(&cru->cru_clksel_con[24]);
 	div = bitfield_extract(val, SARADC_DIV_CON_SHIFT,
 			       SARADC_DIV_CON_WIDTH);

 	return DIV_TO_RATE(OSC_HZ, div);
 }

 static ulong rk3128_saradc_set_clk(struct rk3128_cru *cru, uint hz)
 {
 	int src_clk_div;

 	src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
 	assert(src_clk_div < 128);

 	rk_clrsetreg(&cru->cru_clksel_con[24],
 		     SARADC_DIV_CON_MASK,
 		     src_clk_div << SARADC_DIV_CON_SHIFT);

 	return rk3128_saradc_get_clk(cru);
 }

 static ulong rk3128_vop_set_clk(struct rk3128_cru *cru, ulong clk_id, uint hz)
 {
 	int src_clk_div;
 	struct pll_div cpll_config = {0};

 	src_clk_div = GPLL_HZ / hz;
 	assert(src_clk_div - 1 < 31);

 	switch (clk_id) {
 	case ACLK_VIO0:
 		rk_clrsetreg(&cru->cru_clksel_con[31],
 			     VIO0_PLL_MASK | VIO0_DIV_MASK,
 			     VIO0_SEL_GPLL << VIO0_PLL_SHIFT |
 			     (src_clk_div - 1) << VIO0_DIV_SHIFT);
 		break;
 	case ACLK_VIO1:
 		rk_clrsetreg(&cru->cru_clksel_con[31],
 			     VIO1_PLL_MASK | VIO1_DIV_MASK,
 			     VIO1_SEL_GPLL << VIO1_PLL_SHIFT |
 			     (src_clk_div - 1) << VIO1_DIV_SHIFT);
 		break;
 	case DCLK_LCDC:
 		if (pll_para_config(hz, &cpll_config))
 			return -1;
 		rkclk_set_pll(cru, CLK_CODEC, &cpll_config);

 		rk_clrsetreg(&cru->cru_clksel_con[27],
 			     DCLK_VOP_SEL_MASK | DCLK_VOP_DIV_CON_MASK,
 			     DCLK_VOP_PLL_SEL_CPLL << DCLK_VOP_SEL_SHIFT |
 			     (1 - 1) << DCLK_VOP_DIV_CON_SHIFT);
 		break;
 	default:
 		printf("do not support this vop freq\n");
 		return -EINVAL;
 	}

 	return hz;
 }

 static ulong rk3128_vop_get_rate(struct rk3128_cru *cru, ulong clk_id)
 {
 	u32 div, con, parent;

 	switch (clk_id) {
 	case ACLK_VIO0:
 		con = readl(&cru->cru_clksel_con[31]);
 		div = con  & 0x1f;
 		parent = GPLL_HZ;
 		break;
 	case ACLK_VIO1:
 		con = readl(&cru->cru_clksel_con[31]);
 		div = (con >> 8) & 0x1f;
 		parent = GPLL_HZ;
 		break;
 	case DCLK_LCDC:
 		con = readl(&cru->cru_clksel_con[27]);
 		div = (con >> 8) & 0xfff;
 		parent = rkclk_pll_get_rate(cru, CLK_CODEC);
 		break;
 	default:
 		return -ENOENT;
 	}
 	return DIV_TO_RATE(parent, div);
 }

 static ulong rk3128_clk_get_rate(struct clk *clk)
 {
 	struct rk3128_clk_priv *priv = dev_get_priv(clk->dev);

 	switch (clk->id) {
 	case 0 ... 63:
 		return rkclk_pll_get_rate(priv->cru, clk->id);
 	case PCLK_I2C0:
 	case PCLK_I2C1:
 	case PCLK_I2C2:
 	case PCLK_I2C3:
 	case PCLK_PWM:
 		return rk3128_peri_get_pclk(priv->cru, clk->id);
 	case SCLK_SARADC:
 		return rk3128_saradc_get_clk(priv->cru);
 	case DCLK_LCDC:
 	case ACLK_VIO0:
 	case ACLK_VIO1:
 		return rk3128_vop_get_rate(priv->cru, clk->id);
 	default:
 		return -ENOENT;
 	}
 }

 static ulong rk3128_clk_set_rate(struct clk *clk, ulong rate)
 {
 	struct rk3128_clk_priv *priv = dev_get_priv(clk->dev);
 	ulong new_rate, gclk_rate;

 	gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
 	switch (clk->id) {
 	case 0 ... 63:
 		return 0;
 	case DCLK_LCDC:
 	case ACLK_VIO0:
 	case ACLK_VIO1:
 		new_rate = rk3128_vop_set_clk(priv->cru,
 					      clk->id, rate);
 		break;
 	case HCLK_EMMC:
 		new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
 						clk->id, rate);
 		break;
 	case PCLK_I2C0:
 	case PCLK_I2C1:
 	case PCLK_I2C2:
 	case PCLK_I2C3:
 	case PCLK_PWM:
 		new_rate = rk3128_peri_set_pclk(priv->cru, clk->id, rate);
 		break;
 	case SCLK_SARADC:
 		new_rate = rk3128_saradc_set_clk(priv->cru, rate);
 		break;
 	default:
 		return -ENOENT;
 	}

 	return new_rate;
 }

 static struct clk_ops rk3128_clk_ops = {
 	.get_rate	= rk3128_clk_get_rate,
 	.set_rate	= rk3128_clk_set_rate,
 };

 static int rk3128_clk_of_to_plat(struct udevice *dev)
 {
 	struct rk3128_clk_priv *priv = dev_get_priv(dev);

 	priv->cru = dev_read_addr_ptr(dev);

 	return 0;
 }

 static int rk3128_clk_probe(struct udevice *dev)
 {
 	struct rk3128_clk_priv *priv = dev_get_priv(dev);

 	rkclk_init(priv->cru);

 	return 0;
 }

 static int rk3128_clk_bind(struct udevice *dev)
 {
 	int ret;
 	struct udevice *sys_child;
 	struct sysreset_reg *priv;

 	/* The reset driver does not have a device node, so bind it here */
 	ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
 				 &sys_child);
 	if (ret) {
 		debug("Warning: No sysreset driver: ret=%d\n", ret);
 	} else {
 		priv = malloc(sizeof(struct sysreset_reg));
 		priv->glb_srst_fst_value = offsetof(struct rk3128_cru,
 						    cru_glb_srst_fst_value);
 		priv->glb_srst_snd_value = offsetof(struct rk3128_cru,
 						    cru_glb_srst_snd_value);
 		dev_set_priv(sys_child, priv);
 	}

 	return 0;
 }

 static const struct udevice_id rk3128_clk_ids[] = {
 	{ .compatible = "rockchip,rk3128-cru" },
 	{ .compatible = "rockchip,rk3126-cru" },
 	{ }
 };

 U_BOOT_DRIVER(rockchip_rk3128_cru) = {
 	.name		= "clk_rk3128",
 	.id		= UCLASS_CLK,
 	.of_match	= rk3128_clk_ids,
 	.priv_auto	= sizeof(struct rk3128_clk_priv),
 	.of_to_plat = rk3128_clk_of_to_plat,
 	.ops		= &rk3128_clk_ops,
 	.bind		= rk3128_clk_bind,
 	.probe		= rk3128_clk_probe,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* (C) Copyright 2017 Rockchip Electronics Co., Ltd
	*/

	#include <common.h>
	#include <clk-uclass.h>
	#include <dm.h>
	#include <errno.h>
	#include <log.h>
	#include <malloc.h>
	#include <syscon.h>
	#include <asm/io.h>
	#include <asm/arch-rockchip/clock.h>
	#include <asm/arch-rockchip/cru_rk3128.h>
	#include <asm/arch-rockchip/hardware.h>
	#include <bitfield.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dt-bindings/clock/rk3128-cru.h>
	#include <linux/delay.h>
	#include <linux/log2.h>

	enum {
	VCO_MAX_HZ = 2400U * 1000000,
	VCO_MIN_HZ = 600 * 1000000,
	OUTPUT_MAX_HZ = 2400U * 1000000,
	OUTPUT_MIN_HZ = 24 * 1000000,
	};

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

	#define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
	.refdiv = _refdiv,\
	.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
	.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};

	/* use integer mode*/
	static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
	static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);

	static int rkclk_set_pll(struct rk3128_cru *cru, enum rk_clk_id clk_id,
	const struct pll_div *div)
	{
	int pll_id = rk_pll_id(clk_id);
	struct rk3128_pll *pll = &cru->pll[pll_id];

	/* All PLLs have same VCO and output frequency range restrictions. */
	uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
	uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;

	debug("PLL at %p:fd=%d,rd=%d,pd1=%d,pd2=%d,vco=%uHz,output=%uHz\n",
	pll, div->fbdiv, div->refdiv, div->postdiv1,
	div->postdiv2, vco_hz, output_hz);
	assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
	output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);

	/* use integer mode */
	rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
	/* Power down */
	rk_setreg(&pll->con1, 1 << PLL_PD_SHIFT);

	rk_clrsetreg(&pll->con0,
	PLL_POSTDIV1_MASK \| PLL_FBDIV_MASK,
	(div->postdiv1 << PLL_POSTDIV1_SHIFT) \| div->fbdiv);
	rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK \| PLL_REFDIV_MASK,
	(div->postdiv2 << PLL_POSTDIV2_SHIFT \|
	div->refdiv << PLL_REFDIV_SHIFT));

	/* Power Up */
	rk_clrreg(&pll->con1, 1 << PLL_PD_SHIFT);

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

	return 0;
	}

	static int pll_para_config(u32 freq_hz, struct pll_div *div)
	{
	u32 ref_khz = OSC_HZ / 1000, refdiv, fbdiv = 0;
	u32 postdiv1, postdiv2 = 1;
	u32 fref_khz;
	u32 diff_khz, best_diff_khz;
	const u32 max_refdiv = 63, max_fbdiv = 3200, min_fbdiv = 16;
	const u32 max_postdiv1 = 7, max_postdiv2 = 7;
	u32 vco_khz;
	u32 freq_khz = freq_hz / 1000;

	if (!freq_hz) {
	printf("%s: the frequency can't be 0 Hz\n", __func__);
	return -1;
	}

	postdiv1 = DIV_ROUND_UP(VCO_MIN_HZ / 1000, freq_khz);
	if (postdiv1 > max_postdiv1) {
	postdiv2 = DIV_ROUND_UP(postdiv1, max_postdiv1);
	postdiv1 = DIV_ROUND_UP(postdiv1, postdiv2);
	}

	vco_khz = freq_khz * postdiv1 * postdiv2;

	if (vco_khz < (VCO_MIN_HZ / 1000) \|\| vco_khz > (VCO_MAX_HZ / 1000) \|\|
	postdiv2 > max_postdiv2) {
	printf("%s: Cannot find out a supported VCO for Freq (%uHz)\n",
	__func__, freq_hz);
	return -1;
	}

	div->postdiv1 = postdiv1;
	div->postdiv2 = postdiv2;

	best_diff_khz = vco_khz;
	for (refdiv = 1; refdiv < max_refdiv && best_diff_khz; refdiv++) {
	fref_khz = ref_khz / refdiv;

	fbdiv = vco_khz / fref_khz;
	if ((fbdiv >= max_fbdiv) \|\| (fbdiv <= min_fbdiv))
	continue;
	diff_khz = vco_khz - fbdiv * fref_khz;
	if (fbdiv + 1 < max_fbdiv && diff_khz > fref_khz / 2) {
	fbdiv++;
	diff_khz = fref_khz - diff_khz;
	}

	if (diff_khz >= best_diff_khz)
	continue;

	best_diff_khz = diff_khz;
	div->refdiv = refdiv;
	div->fbdiv = fbdiv;
	}

	if (best_diff_khz > 4 * (1000)) {
	printf("%s: Failed to match output frequency %u bestis %u Hz\n",
	__func__, freq_hz,
	best_diff_khz * 1000);
	return -1;
	}
	return 0;
	}

	static void rkclk_init(struct rk3128_cru *cru)
	{
	u32 aclk_div;
	u32 hclk_div;
	u32 pclk_div;

	/* pll enter slow-mode */
	rk_clrsetreg(&cru->cru_mode_con,
	GPLL_MODE_MASK \| APLL_MODE_MASK,
	GPLL_MODE_SLOW << GPLL_MODE_SHIFT \|
	APLL_MODE_SLOW << APLL_MODE_SHIFT);

	/* init pll */
	rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
	rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);

	/*
	* select apll as cpu/core clock pll source and
	* set up dependent divisors for PERI and ACLK clocks.
	* core hz : apll = 1:1
	*/
	aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
	assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);

	pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
	assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);

	rk_clrsetreg(&cru->cru_clksel_con[0],
	CORE_CLK_PLL_SEL_MASK \| CORE_DIV_CON_MASK,
	CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT \|
	0 << CORE_DIV_CON_SHIFT);

	rk_clrsetreg(&cru->cru_clksel_con[1],
	CORE_ACLK_DIV_MASK \| CORE_PERI_DIV_MASK,
	aclk_div << CORE_ACLK_DIV_SHIFT \|
	pclk_div << CORE_PERI_DIV_SHIFT);

	/*
	* select gpll as pd_bus bus clock source and
	* set up dependent divisors for PCLK/HCLK and ACLK clocks.
	*/
	aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
	assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);

	pclk_div = BUS_ACLK_HZ / BUS_PCLK_HZ - 1;
	assert((pclk_div + 1) * BUS_PCLK_HZ == BUS_ACLK_HZ && pclk_div <= 0x7);

	hclk_div = BUS_ACLK_HZ / BUS_HCLK_HZ - 1;
	assert((hclk_div + 1) * BUS_HCLK_HZ == BUS_ACLK_HZ && hclk_div <= 0x3);

	rk_clrsetreg(&cru->cru_clksel_con[0],
	BUS_ACLK_PLL_SEL_MASK \| BUS_ACLK_DIV_MASK,
	BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT \|
	aclk_div << BUS_ACLK_DIV_SHIFT);

	rk_clrsetreg(&cru->cru_clksel_con[1],
	BUS_PCLK_DIV_MASK \| BUS_HCLK_DIV_MASK,
	pclk_div << BUS_PCLK_DIV_SHIFT \|
	hclk_div << BUS_HCLK_DIV_SHIFT);

	/*
	* select gpll as pd_peri bus clock source and
	* set up dependent divisors for PCLK/HCLK and ACLK clocks.
	*/
	aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
	assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);

	hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
	assert((1 << hclk_div) * PERI_HCLK_HZ ==
	PERI_ACLK_HZ && (hclk_div < 0x4));

	pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
	assert((1 << pclk_div) * PERI_PCLK_HZ ==
	PERI_ACLK_HZ && pclk_div < 0x8);

	rk_clrsetreg(&cru->cru_clksel_con[10],
	PERI_PLL_SEL_MASK \| PERI_PCLK_DIV_MASK \|
	PERI_HCLK_DIV_MASK \| PERI_ACLK_DIV_MASK,
	PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT \|
	pclk_div << PERI_PCLK_DIV_SHIFT \|
	hclk_div << PERI_HCLK_DIV_SHIFT \|
	aclk_div << PERI_ACLK_DIV_SHIFT);

	/* PLL enter normal-mode */
	rk_clrsetreg(&cru->cru_mode_con,
	GPLL_MODE_MASK \| APLL_MODE_MASK \| CPLL_MODE_MASK,
	GPLL_MODE_NORM << GPLL_MODE_SHIFT \|
	APLL_MODE_NORM << APLL_MODE_SHIFT \|
	CPLL_MODE_NORM << CPLL_MODE_SHIFT);

	/fix NAND controller working clock max to 150Mhz /
	rk_clrsetreg(&cru->cru_clksel_con[2],
	NANDC_PLL_SEL_MASK \| NANDC_CLK_DIV_MASK,
	NANDC_PLL_SEL_GPLL << NANDC_PLL_SEL_SHIFT \|
	3 << NANDC_CLK_DIV_SHIFT);
	}

	/* Get pll rate by id */
	static u32 rkclk_pll_get_rate(struct rk3128_cru *cru,
	enum rk_clk_id clk_id)
	{
	u32 refdiv, fbdiv, postdiv1, postdiv2;
	u32 con;
	int pll_id = rk_pll_id(clk_id);
	struct rk3128_pll *pll = &cru->pll[pll_id];
	static u8 clk_shift[CLK_COUNT] = {
	0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, CPLL_MODE_SHIFT,
	GPLL_MODE_SHIFT, 0xff
	};
	static u32 clk_mask[CLK_COUNT] = {
	0xff, APLL_MODE_MASK, DPLL_MODE_MASK, CPLL_MODE_MASK,
	GPLL_MODE_MASK, 0xff
	};
	uint shift;
	uint mask;

	con = readl(&cru->cru_mode_con);
	shift = clk_shift[clk_id];
	mask = clk_mask[clk_id];

	switch ((con & mask) >> shift) {
	case GPLL_MODE_SLOW:
	return OSC_HZ;
	case GPLL_MODE_NORM:
	/* normal mode */
	con = readl(&pll->con0);
	postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
	fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
	con = readl(&pll->con1);
	postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
	refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
	return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
	case GPLL_MODE_DEEP:
	default:
	return 32768;
	}
	}

	static ulong rockchip_mmc_get_clk(struct rk3128_cru *cru, uint clk_general_rate,
	int periph)
	{
	uint src_rate;
	uint div, mux;
	u32 con;

	switch (periph) {
	case HCLK_EMMC:
	case SCLK_EMMC:
	case SCLK_EMMC_SAMPLE:
	con = readl(&cru->cru_clksel_con[12]);
	mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
	div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
	break;
	case HCLK_SDMMC:
	case SCLK_SDMMC:
	con = readl(&cru->cru_clksel_con[11]);
	mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
	div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
	break;
	default:
	return -EINVAL;
	}

	src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
	return DIV_TO_RATE(src_rate, div);
	}

	static ulong rockchip_mmc_set_clk(struct rk3128_cru *cru, uint clk_general_rate,
	int periph, uint freq)
	{
	int src_clk_div;
	int mux;

	debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);

	/* mmc clock defaulg div 2 internal, need provide double in cru */
	src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);

	if (src_clk_div > 128) {
	src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
	mux = EMMC_SEL_24M;
	} else {
	mux = EMMC_SEL_GPLL;
	}

	switch (periph) {
	case HCLK_EMMC:
	rk_clrsetreg(&cru->cru_clksel_con[12],
	EMMC_PLL_MASK \| EMMC_DIV_MASK,
	mux << EMMC_PLL_SHIFT \|
	(src_clk_div - 1) << EMMC_DIV_SHIFT);
	break;
	case HCLK_SDMMC:
	case SCLK_SDMMC:
	rk_clrsetreg(&cru->cru_clksel_con[11],
	MMC0_PLL_MASK \| MMC0_DIV_MASK,
	mux << MMC0_PLL_SHIFT \|
	(src_clk_div - 1) << MMC0_DIV_SHIFT);
	break;
	default:
	return -EINVAL;
	}

	return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
	}

	static ulong rk3128_peri_get_pclk(struct rk3128_cru *cru, ulong clk_id)
	{
	u32 div, con;

	switch (clk_id) {
	case PCLK_I2C0:
	case PCLK_I2C1:
	case PCLK_I2C2:
	case PCLK_I2C3:
	case PCLK_PWM:
	con = readl(&cru->cru_clksel_con[10]);
	div = con >> 12 & 0x3;
	break;
	default:
	printf("do not support this peripheral bus\n");
	return -EINVAL;
	}

	return DIV_TO_RATE(PERI_ACLK_HZ, div);
	}

	static ulong rk3128_peri_set_pclk(struct rk3128_cru *cru, ulong clk_id, uint hz)
	{
	int src_clk_div;

	src_clk_div = PERI_ACLK_HZ / hz;
	assert(src_clk_div - 1 < 4);

	switch (clk_id) {
	case PCLK_I2C0:
	case PCLK_I2C1:
	case PCLK_I2C2:
	case PCLK_I2C3:
	case PCLK_PWM:
	rk_setreg(&cru->cru_clksel_con[10],
	((src_clk_div - 1) << 12));
	break;
	default:
	printf("do not support this peripheral bus\n");
	return -EINVAL;
	}

	return DIV_TO_RATE(PERI_ACLK_HZ, src_clk_div);
	}

	static ulong rk3128_saradc_get_clk(struct rk3128_cru *cru)
	{
	u32 div, val;

	val = readl(&cru->cru_clksel_con[24]);
	div = bitfield_extract(val, SARADC_DIV_CON_SHIFT,
	SARADC_DIV_CON_WIDTH);

	return DIV_TO_RATE(OSC_HZ, div);
	}

	static ulong rk3128_saradc_set_clk(struct rk3128_cru *cru, uint hz)
	{
	int src_clk_div;

	src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
	assert(src_clk_div < 128);

	rk_clrsetreg(&cru->cru_clksel_con[24],
	SARADC_DIV_CON_MASK,
	src_clk_div << SARADC_DIV_CON_SHIFT);

	return rk3128_saradc_get_clk(cru);
	}

	static ulong rk3128_vop_set_clk(struct rk3128_cru *cru, ulong clk_id, uint hz)
	{
	int src_clk_div;
	struct pll_div cpll_config = {0};

	src_clk_div = GPLL_HZ / hz;
	assert(src_clk_div - 1 < 31);

	switch (clk_id) {
	case ACLK_VIO0:
	rk_clrsetreg(&cru->cru_clksel_con[31],
	VIO0_PLL_MASK \| VIO0_DIV_MASK,
	VIO0_SEL_GPLL << VIO0_PLL_SHIFT \|
	(src_clk_div - 1) << VIO0_DIV_SHIFT);
	break;
	case ACLK_VIO1:
	rk_clrsetreg(&cru->cru_clksel_con[31],
	VIO1_PLL_MASK \| VIO1_DIV_MASK,
	VIO1_SEL_GPLL << VIO1_PLL_SHIFT \|
	(src_clk_div - 1) << VIO1_DIV_SHIFT);
	break;
	case DCLK_LCDC:
	if (pll_para_config(hz, &cpll_config))
	return -1;
	rkclk_set_pll(cru, CLK_CODEC, &cpll_config);

	rk_clrsetreg(&cru->cru_clksel_con[27],
	DCLK_VOP_SEL_MASK \| DCLK_VOP_DIV_CON_MASK,
	DCLK_VOP_PLL_SEL_CPLL << DCLK_VOP_SEL_SHIFT \|
	(1 - 1) << DCLK_VOP_DIV_CON_SHIFT);
	break;
	default:
	printf("do not support this vop freq\n");
	return -EINVAL;
	}

	return hz;
	}

	static ulong rk3128_vop_get_rate(struct rk3128_cru *cru, ulong clk_id)
	{
	u32 div, con, parent;

	switch (clk_id) {
	case ACLK_VIO0:
	con = readl(&cru->cru_clksel_con[31]);
	div = con & 0x1f;
	parent = GPLL_HZ;
	break;
	case ACLK_VIO1:
	con = readl(&cru->cru_clksel_con[31]);
	div = (con >> 8) & 0x1f;
	parent = GPLL_HZ;
	break;
	case DCLK_LCDC:
	con = readl(&cru->cru_clksel_con[27]);
	div = (con >> 8) & 0xfff;
	parent = rkclk_pll_get_rate(cru, CLK_CODEC);
	break;
	default:
	return -ENOENT;
	}
	return DIV_TO_RATE(parent, div);
	}

	static ulong rk3128_clk_get_rate(struct clk *clk)
	{
	struct rk3128_clk_priv *priv = dev_get_priv(clk->dev);

	switch (clk->id) {
	case 0 ... 63:
	return rkclk_pll_get_rate(priv->cru, clk->id);
	case PCLK_I2C0:
	case PCLK_I2C1:
	case PCLK_I2C2:
	case PCLK_I2C3:
	case PCLK_PWM:
	return rk3128_peri_get_pclk(priv->cru, clk->id);
	case SCLK_SARADC:
	return rk3128_saradc_get_clk(priv->cru);
	case DCLK_LCDC:
	case ACLK_VIO0:
	case ACLK_VIO1:
	return rk3128_vop_get_rate(priv->cru, clk->id);
	default:
	return -ENOENT;
	}
	}

	static ulong rk3128_clk_set_rate(struct clk *clk, ulong rate)
	{
	struct rk3128_clk_priv *priv = dev_get_priv(clk->dev);
	ulong new_rate, gclk_rate;

	gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
	switch (clk->id) {
	case 0 ... 63:
	return 0;
	case DCLK_LCDC:
	case ACLK_VIO0:
	case ACLK_VIO1:
	new_rate = rk3128_vop_set_clk(priv->cru,
	clk->id, rate);
	break;
	case HCLK_EMMC:
	new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
	clk->id, rate);
	break;
	case PCLK_I2C0:
	case PCLK_I2C1:
	case PCLK_I2C2:
	case PCLK_I2C3:
	case PCLK_PWM:
	new_rate = rk3128_peri_set_pclk(priv->cru, clk->id, rate);
	break;
	case SCLK_SARADC:
	new_rate = rk3128_saradc_set_clk(priv->cru, rate);
	break;
	default:
	return -ENOENT;
	}

	return new_rate;
	}

	static struct clk_ops rk3128_clk_ops = {
	.get_rate = rk3128_clk_get_rate,
	.set_rate = rk3128_clk_set_rate,
	};

	static int rk3128_clk_of_to_plat(struct udevice *dev)
	{
	struct rk3128_clk_priv *priv = dev_get_priv(dev);

	priv->cru = dev_read_addr_ptr(dev);

	return 0;
	}

	static int rk3128_clk_probe(struct udevice *dev)
	{
	struct rk3128_clk_priv *priv = dev_get_priv(dev);

	rkclk_init(priv->cru);

	return 0;
	}

	static int rk3128_clk_bind(struct udevice *dev)
	{
	int ret;
	struct udevice *sys_child;
	struct sysreset_reg *priv;

	/* The reset driver does not have a device node, so bind it here */
	ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
	&sys_child);
	if (ret) {
	debug("Warning: No sysreset driver: ret=%d\n", ret);
	} else {
	priv = malloc(sizeof(struct sysreset_reg));
	priv->glb_srst_fst_value = offsetof(struct rk3128_cru,
	cru_glb_srst_fst_value);
	priv->glb_srst_snd_value = offsetof(struct rk3128_cru,
	cru_glb_srst_snd_value);
	dev_set_priv(sys_child, priv);
	}

	return 0;
	}

	static const struct udevice_id rk3128_clk_ids[] = {
	{ .compatible = "rockchip,rk3128-cru" },
	{ .compatible = "rockchip,rk3126-cru" },
	{ }
	};

	U_BOOT_DRIVER(rockchip_rk3128_cru) = {
	.name = "clk_rk3128",
	.id = UCLASS_CLK,
	.of_match = rk3128_clk_ids,
	.priv_auto = sizeof(struct rk3128_clk_priv),
	.of_to_plat = rk3128_clk_of_to_plat,
	.ops = &rk3128_clk_ops,
	.bind = rk3128_clk_bind,
	.probe = rk3128_clk_probe,
	};