u-boot-brain/arch/arm/mach-imx/imx8m/clock_imx8mm.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2018-2019 NXP
 *
 * Peng Fan <peng.fan@nxp.com>
 */

#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/io.h>
#include <clk.h>
#include <clk-uclass.h>
#include <dt-bindings/clock/imx8mm-clock.h>
#include <div64.h>
#include <errno.h>

DECLARE_GLOBAL_DATA_PTR;

static struct anamix_pll *ana_pll = (struct anamix_pll *)ANATOP_BASE_ADDR;

void enable_ocotp_clk(unsigned char enable)
{
	struct clk *clkp;
	int ret;

	ret = clk_get_by_id(IMX8MM_CLK_OCOTP_ROOT, &clkp);
	if (ret) {
		printf("%s: err: %d\n", __func__, ret);
		return;
	}

	enable ? clk_enable(clkp) : clk_disable(clkp);
}

int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
{
	struct clk *clkp;
	int ret;

	ret = clk_get_by_id(IMX8MM_CLK_I2C1_ROOT + i2c_num, &clkp);
	if (ret) {
		printf("%s: err: %d\n", __func__, ret);
		return ret;
	}

	return enable ? clk_enable(clkp) : clk_disable(clkp);
}

#ifdef CONFIG_SPL_BUILD
static struct imx_int_pll_rate_table imx8mm_fracpll_tbl[] = {
	PLL_1443X_RATE(800000000U, 300, 9, 0, 0),
	PLL_1443X_RATE(750000000U, 250, 8, 0, 0),
	PLL_1443X_RATE(650000000U, 325, 3, 2, 0),
	PLL_1443X_RATE(600000000U, 300, 3, 2, 0),
	PLL_1443X_RATE(594000000U, 99, 1, 2, 0),
	PLL_1443X_RATE(400000000U, 300, 9, 1, 0),
	PLL_1443X_RATE(266666667U, 400, 9, 2, 0),
	PLL_1443X_RATE(167000000U, 334, 3, 4, 0),
	PLL_1443X_RATE(100000000U, 300, 9, 3, 0),
};

int fracpll_configure(enum pll_clocks pll, u32 freq)
{
	int i;
	u32 tmp, div_val;
	void *pll_base;
	struct imx_int_pll_rate_table *rate;

	for (i = 0; i < ARRAY_SIZE(imx8mm_fracpll_tbl); i++) {
		if (freq == imx8mm_fracpll_tbl[i].rate)
			break;
	}

	if (i == ARRAY_SIZE(imx8mm_fracpll_tbl)) {
		printf("No matched freq table %u\n", freq);
		return -EINVAL;
	}

	rate = &imx8mm_fracpll_tbl[i];

	switch (pll) {
	case ANATOP_DRAM_PLL:
		setbits_le32(GPC_BASE_ADDR + 0xEC, 1 << 7);
		setbits_le32(GPC_BASE_ADDR + 0xF8, 1 << 5);
		writel(SRC_DDR1_ENABLE_MASK, SRC_BASE_ADDR + 0x1004);

		pll_base = &ana_pll->dram_pll_gnrl_ctl;
		break;
	case ANATOP_VIDEO_PLL:
		pll_base = &ana_pll->video_pll1_gnrl_ctl;
		break;
	default:
		return 0;
	}
	/* Bypass clock and set lock to pll output lock */
	tmp = readl(pll_base);
	tmp |= BYPASS_MASK;
	writel(tmp, pll_base);

	/* Enable RST */
	tmp &= ~RST_MASK;
	writel(tmp, pll_base);

	div_val = (rate->mdiv << MDIV_SHIFT) | (rate->pdiv << PDIV_SHIFT) |
		(rate->sdiv << SDIV_SHIFT);
	writel(div_val, pll_base + 4);
	writel(rate->kdiv << KDIV_SHIFT, pll_base + 8);

	__udelay(100);

	/* Disable RST */
	tmp |= RST_MASK;
	writel(tmp, pll_base);

	/* Wait Lock*/
	while (!(readl(pll_base) & LOCK_STATUS))
		;

	/* Bypass */
	tmp &= ~BYPASS_MASK;
	writel(tmp, pll_base);

	return 0;
}

void dram_pll_init(ulong pll_val)
{
	fracpll_configure(ANATOP_DRAM_PLL, pll_val);
}

static struct dram_bypass_clk_setting imx8mm_dram_bypass_tbl[] = {
	DRAM_BYPASS_ROOT_CONFIG(MHZ(100), 2, CLK_ROOT_PRE_DIV1, 2,
				CLK_ROOT_PRE_DIV2),
	DRAM_BYPASS_ROOT_CONFIG(MHZ(250), 3, CLK_ROOT_PRE_DIV2, 2,
				CLK_ROOT_PRE_DIV2),
	DRAM_BYPASS_ROOT_CONFIG(MHZ(400), 1, CLK_ROOT_PRE_DIV2, 3,
				CLK_ROOT_PRE_DIV2),
};

void dram_enable_bypass(ulong clk_val)
{
	int i;
	struct dram_bypass_clk_setting *config;

	for (i = 0; i < ARRAY_SIZE(imx8mm_dram_bypass_tbl); i++) {
		if (clk_val == imx8mm_dram_bypass_tbl[i].clk)
			break;
	}

	if (i == ARRAY_SIZE(imx8mm_dram_bypass_tbl)) {
		printf("No matched freq table %lu\n", clk_val);
		return;
	}

	config = &imx8mm_dram_bypass_tbl[i];

	clock_set_target_val(DRAM_ALT_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(config->alt_root_sel) |
			     CLK_ROOT_PRE_DIV(config->alt_pre_div));
	clock_set_target_val(DRAM_APB_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(config->apb_root_sel) |
			     CLK_ROOT_PRE_DIV(config->apb_pre_div));
	clock_set_target_val(DRAM_SEL_CFG, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(1));
}

void dram_disable_bypass(void)
{
	clock_set_target_val(DRAM_SEL_CFG, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(0));
	clock_set_target_val(DRAM_APB_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(4) |
			     CLK_ROOT_PRE_DIV(CLK_ROOT_PRE_DIV5));
}
#endif

void init_uart_clk(u32 index)
{
	/*
	 * set uart clock root
	 * 24M OSC
	 */
	switch (index) {
	case 0:
		clock_enable(CCGR_UART1, 0);
		clock_set_target_val(UART1_CLK_ROOT, CLK_ROOT_ON |
				     CLK_ROOT_SOURCE_SEL(0));
		clock_enable(CCGR_UART1, 1);
		return;
	case 1:
		clock_enable(CCGR_UART2, 0);
		clock_set_target_val(UART2_CLK_ROOT, CLK_ROOT_ON |
				     CLK_ROOT_SOURCE_SEL(0));
		clock_enable(CCGR_UART2, 1);
		return;
	case 2:
		clock_enable(CCGR_UART3, 0);
		clock_set_target_val(UART3_CLK_ROOT, CLK_ROOT_ON |
				     CLK_ROOT_SOURCE_SEL(0));
		clock_enable(CCGR_UART3, 1);
		return;
	case 3:
		clock_enable(CCGR_UART4, 0);
		clock_set_target_val(UART4_CLK_ROOT, CLK_ROOT_ON |
				     CLK_ROOT_SOURCE_SEL(0));
		clock_enable(CCGR_UART4, 1);
		return;
	default:
		printf("Invalid uart index\n");
		return;
	}
}

void init_wdog_clk(void)
{
	clock_enable(CCGR_WDOG1, 0);
	clock_enable(CCGR_WDOG2, 0);
	clock_enable(CCGR_WDOG3, 0);
	clock_set_target_val(WDOG_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(0));
	clock_enable(CCGR_WDOG1, 1);
	clock_enable(CCGR_WDOG2, 1);
	clock_enable(CCGR_WDOG3, 1);
}

int clock_init(void)
{
	u32 val_cfg0;

	/*
	 * The gate is not exported to clk tree, so configure them here.
	 * According to ANAMIX SPEC
	 * sys pll1 fixed at 800MHz
	 * sys pll2 fixed at 1GHz
	 * Here we only enable the outputs.
	 */
	val_cfg0 = readl(&ana_pll->sys_pll1_gnrl_ctl);
	val_cfg0 |= INTPLL_CLKE_MASK | INTPLL_DIV2_CLKE_MASK |
		INTPLL_DIV3_CLKE_MASK | INTPLL_DIV4_CLKE_MASK |
		INTPLL_DIV5_CLKE_MASK | INTPLL_DIV6_CLKE_MASK |
		INTPLL_DIV8_CLKE_MASK | INTPLL_DIV10_CLKE_MASK |
		INTPLL_DIV20_CLKE_MASK;
	writel(val_cfg0, &ana_pll->sys_pll1_gnrl_ctl);

	val_cfg0 = readl(&ana_pll->sys_pll2_gnrl_ctl);
	val_cfg0 |= INTPLL_CLKE_MASK | INTPLL_DIV2_CLKE_MASK |
		INTPLL_DIV3_CLKE_MASK | INTPLL_DIV4_CLKE_MASK |
		INTPLL_DIV5_CLKE_MASK | INTPLL_DIV6_CLKE_MASK |
		INTPLL_DIV8_CLKE_MASK | INTPLL_DIV10_CLKE_MASK |
		INTPLL_DIV20_CLKE_MASK;
	writel(val_cfg0, &ana_pll->sys_pll2_gnrl_ctl);

	/* config GIC to sys_pll2_100m */
	clock_enable(CCGR_GIC, 0);
	clock_set_target_val(GIC_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(3));
	clock_enable(CCGR_GIC, 1);

	clock_set_target_val(NAND_USDHC_BUS_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(1));

	clock_enable(CCGR_DDR1, 0);
	clock_set_target_val(DRAM_ALT_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(1));
	clock_set_target_val(DRAM_APB_CLK_ROOT, CLK_ROOT_ON |
			     CLK_ROOT_SOURCE_SEL(1));
	clock_enable(CCGR_DDR1, 1);

	init_wdog_clk();

	clock_enable(CCGR_TEMP_SENSOR, 1);

	clock_enable(CCGR_SEC_DEBUG, 1);

	return 0;
};

u32 imx_get_uartclk(void)
{
	return 24000000U;
}

u32 mxc_get_clock(enum mxc_clock clk)
{
	struct clk *clkp;
	int ret;

	switch (clk) {
	case MXC_IPG_CLK:
		ret = clk_get_by_id(IMX8MM_CLK_IPG_ROOT, &clkp);
		if (ret)
			return 0;
		return clk_get_rate(clkp);
	case MXC_ARM_CLK:
		ret = clk_get_by_id(IMX8MM_CLK_A53_DIV, &clkp);
		if (ret)
			return 0;
		return clk_get_rate(clkp);
	default:
		printf("%s: %d not supported\n", __func__, clk);
	}

	return 0;
}