u-boot/arch/arm/mach-imx/imx8ulp/clock.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2020 NXP
 */

#include <common.h>
#include <command.h>
#include <div64.h>
#include <asm/arch/imx-regs.h>
#include <asm/io.h>
#include <errno.h>
#include <asm/arch/clock.h>
#include <asm/arch/pcc.h>
#include <asm/arch/cgc.h>
#include <asm/arch/sys_proto.h>
#include <asm/global_data.h>
#include <linux/delay.h>

DECLARE_GLOBAL_DATA_PTR;

#define PLL_USB_EN_USB_CLKS_MASK	(0x01 << 6)
#define PLL_USB_PWR_MASK		(0x01 << 12)
#define PLL_USB_ENABLE_MASK		(0x01 << 13)
#define PLL_USB_BYPASS_MASK		(0x01 << 16)
#define PLL_USB_REG_ENABLE_MASK		(0x01 << 21)
#define PLL_USB_DIV_SEL_MASK		(0x07 << 22)
#define PLL_USB_LOCK_MASK		(0x01 << 31)
#define PCC5_LPDDR4_ADDR 0x2da70108

static void lpuart_set_clk(u32 index, enum cgc1_clk clk)
{
	const u32 lpuart_pcc_slots[] = {
		LPUART4_PCC3_SLOT,
		LPUART5_PCC3_SLOT,
		LPUART6_PCC4_SLOT,
		LPUART7_PCC4_SLOT,
	};

	const u32 lpuart_pcc[] = {
		3, 3, 4, 4,
	};

	if (index > 3)
		return;

	pcc_clock_enable(lpuart_pcc[index], lpuart_pcc_slots[index], false);
	pcc_clock_sel(lpuart_pcc[index], lpuart_pcc_slots[index], clk);
	pcc_clock_enable(lpuart_pcc[index], lpuart_pcc_slots[index], true);

	pcc_reset_peripheral(lpuart_pcc[index], lpuart_pcc_slots[index], false);
}

static void init_clk_lpuart(void)
{
	u32 index = 0, i;

	const u32 lpuart_array[] = {
		LPUART4_RBASE,
		LPUART5_RBASE,
		LPUART6_RBASE,
		LPUART7_RBASE,
	};

	for (i = 0; i < 4; i++) {
		if (lpuart_array[i] == LPUART_BASE) {
			index = i;
			break;
		}
	}

	lpuart_set_clk(index, SOSC_DIV2);
}

void init_clk_fspi(int index)
{
	pcc_clock_enable(4, FLEXSPI2_PCC4_SLOT, false);
	pcc_clock_sel(4, FLEXSPI2_PCC4_SLOT, PLL3_PFD2_DIV1);
	pcc_clock_div_config(4, FLEXSPI2_PCC4_SLOT, false, 8);
	pcc_clock_enable(4, FLEXSPI2_PCC4_SLOT, true);
	pcc_reset_peripheral(4, FLEXSPI2_PCC4_SLOT, false);
}

void setclkout_ddr(void)
{
	writel(0x12800000, 0x2DA60020);
	writel(0xa00, 0x298C0000); /* PTD0 */
}

void ddrphy_pll_lock(void)
{
	writel(0x00011542, 0x2E065964);
	writel(0x00011542, 0x2E06586C);

	writel(0x00000B01, 0x2E062000);
	writel(0x00000B01, 0x2E060000);
}

void init_clk_ddr(void)
{
	/* enable pll4 and ddrclk*/
	cgc2_pll4_init();
	cgc2_ddrclk_config(1, 1);

	/* enable ddr pcc */
	writel(0xd0000000, PCC5_LPDDR4_ADDR);

	/* for debug */
	/* setclkout_ddr(); */
}

int set_ddr_clk(u32 phy_freq_mhz)
{
	debug("%s %u\n", __func__, phy_freq_mhz);

	if (phy_freq_mhz == 48) {
		writel(0x90000000, PCC5_LPDDR4_ADDR); /* disable ddr pcc */
		cgc2_ddrclk_config(2, 0); /* 24Mhz DDR clock */
		writel(0xd0000000, PCC5_LPDDR4_ADDR); /* enable ddr pcc */
	} else if (phy_freq_mhz == 384) {
		writel(0x90000000, PCC5_LPDDR4_ADDR); /* disable ddr pcc */
		cgc2_ddrclk_config(0, 0); /* 192Mhz DDR clock */
		writel(0xd0000000, PCC5_LPDDR4_ADDR); /* enable ddr pcc */
	} else if (phy_freq_mhz == 528) {
		writel(0x90000000, PCC5_LPDDR4_ADDR); /* disable ddr pcc */
		cgc2_ddrclk_config(4, 1); /* 264Mhz DDR clock */
		writel(0xd0000000, PCC5_LPDDR4_ADDR); /* enable ddr pcc */
	} else if (phy_freq_mhz == 264) {
		writel(0x90000000, PCC5_LPDDR4_ADDR); /* disable ddr pcc */
		cgc2_ddrclk_config(4, 3); /* 132Mhz DDR clock */
		writel(0xd0000000, PCC5_LPDDR4_ADDR); /* enable ddr pcc */
	} else if (phy_freq_mhz == 192) {
		writel(0x90000000, PCC5_LPDDR4_ADDR); /* disable ddr pcc */
		cgc2_ddrclk_config(0, 1); /* 96Mhz DDR clock */
		writel(0xd0000000, PCC5_LPDDR4_ADDR); /* enable ddr pcc */
	} else if (phy_freq_mhz == 96) {
		writel(0x90000000, PCC5_LPDDR4_ADDR); /* disable ddr pcc */
		cgc2_ddrclk_config(0, 3); /* 48Mhz DDR clock */
		writel(0xd0000000, PCC5_LPDDR4_ADDR); /* enable ddr pcc */
	} else {
		printf("ddr phy clk %uMhz is not supported\n", phy_freq_mhz);
		return -EINVAL;
	}

	return 0;
}

void clock_init(void)
{
	cgc1_soscdiv_init();
	cgc1_init_core_clk();

	init_clk_lpuart();

	pcc_clock_enable(4, SDHC0_PCC4_SLOT, false);
	pcc_clock_sel(4, SDHC0_PCC4_SLOT, PLL3_PFD1_DIV2);
	pcc_clock_enable(4, SDHC0_PCC4_SLOT, true);
	pcc_reset_peripheral(4, SDHC0_PCC4_SLOT, false);

	pcc_clock_enable(4, SDHC1_PCC4_SLOT, false);
	pcc_clock_sel(4, SDHC1_PCC4_SLOT, PLL3_PFD2_DIV1);
	pcc_clock_enable(4, SDHC1_PCC4_SLOT, true);
	pcc_reset_peripheral(4, SDHC1_PCC4_SLOT, false);

	pcc_clock_enable(4, SDHC2_PCC4_SLOT, false);
	pcc_clock_sel(4, SDHC2_PCC4_SLOT, PLL3_PFD2_DIV1);
	pcc_clock_enable(4, SDHC2_PCC4_SLOT, true);
	pcc_reset_peripheral(4, SDHC2_PCC4_SLOT, false);

	/* Enable upower mu1 clk */
	pcc_clock_enable(3, UPOWER_PCC3_SLOT, true);

	/*
	 * Enable clock division
	 * TODO: may not needed after ROM ready.
	 */
}

#if IS_ENABLED(CONFIG_SYS_I2C_IMX_LPI2C)
int enable_i2c_clk(unsigned char enable, u32 i2c_num)
{
	/* Set parent to FIRC DIV2 clock */
	const u32 lpi2c_pcc_clks[] = {
		LPI2C4_PCC3_SLOT << 8 | 3,
		LPI2C5_PCC3_SLOT << 8 | 3,
		LPI2C6_PCC4_SLOT << 8 | 4,
		LPI2C7_PCC4_SLOT << 8 | 4,
	};

	if (i2c_num < 4 || i2c_num > 7)
		return -EINVAL;

	if (enable) {
		pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4] & 0xff,
				 lpi2c_pcc_clks[i2c_num - 4] >> 8, false);
		pcc_clock_sel(lpi2c_pcc_clks[i2c_num - 4] & 0xff,
			      lpi2c_pcc_clks[i2c_num - 4] >> 8, SOSC_DIV2);
		pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4] & 0xff,
				 lpi2c_pcc_clks[i2c_num - 4] >> 8, true);
		pcc_reset_peripheral(lpi2c_pcc_clks[i2c_num - 4] & 0xff,
				     lpi2c_pcc_clks[i2c_num - 4] >> 8, false);
	} else {
		pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4] & 0xff,
				 lpi2c_pcc_clks[i2c_num - 4] >> 8, false);
	}
	return 0;
}

u32 imx_get_i2cclk(u32 i2c_num)
{
	const u32 lpi2c_pcc_clks[] = {
		LPI2C4_PCC3_SLOT << 8 | 3,
		LPI2C5_PCC3_SLOT << 8 | 3,
		LPI2C6_PCC4_SLOT << 8 | 4,
		LPI2C7_PCC4_SLOT << 8 | 4,
	};

	if (i2c_num < 4 || i2c_num > 7)
		return 0;

	return pcc_clock_get_rate(lpi2c_pcc_clks[i2c_num - 4] & 0xff,
				  lpi2c_pcc_clks[i2c_num - 4] >> 8);
}
#endif

void enable_usboh3_clk(unsigned char enable)
{
	if (enable) {
		pcc_clock_enable(4, USB0_PCC4_SLOT, true);
		pcc_clock_enable(4, USBPHY_PCC4_SLOT, true);
		pcc_reset_peripheral(4, USB0_PCC4_SLOT, false);
		pcc_reset_peripheral(4, USBPHY_PCC4_SLOT, false);

#ifdef CONFIG_USB_MAX_CONTROLLER_COUNT
		if (CONFIG_USB_MAX_CONTROLLER_COUNT > 1) {
			pcc_clock_enable(4, USB1_PCC4_SLOT, true);
			pcc_clock_enable(4, USB1PHY_PCC4_SLOT, true);
			pcc_reset_peripheral(4, USB1_PCC4_SLOT, false);
			pcc_reset_peripheral(4, USB1PHY_PCC4_SLOT, false);
		}
#endif

		pcc_clock_enable(4, USB_XBAR_PCC4_SLOT, true);
	} else {
		pcc_clock_enable(4, USB0_PCC4_SLOT, false);
		pcc_clock_enable(4, USB1_PCC4_SLOT, false);
		pcc_clock_enable(4, USBPHY_PCC4_SLOT, false);
		pcc_clock_enable(4, USB1PHY_PCC4_SLOT, false);
		pcc_clock_enable(4, USB_XBAR_PCC4_SLOT, false);
	}
}

int enable_usb_pll(ulong usb_phy_base)
{
	u32 sosc_rate;
	s32 timeout = 1000000;

	struct usbphy_regs *usbphy =
		(struct usbphy_regs *)usb_phy_base;

	sosc_rate = cgc1_sosc_div(SOSC);
	if (!sosc_rate)
		return -EPERM;

	if (!(readl(&usbphy->usb1_pll_480_ctrl) & PLL_USB_LOCK_MASK)) {
		writel(0x1c00000, &usbphy->usb1_pll_480_ctrl_clr);

		switch (sosc_rate) {
		case 24000000:
			writel(0xc00000, &usbphy->usb1_pll_480_ctrl_set);
			break;

		case 30000000:
			writel(0x800000, &usbphy->usb1_pll_480_ctrl_set);
			break;

		case 19200000:
			writel(0x1400000, &usbphy->usb1_pll_480_ctrl_set);
			break;

		default:
			writel(0xc00000, &usbphy->usb1_pll_480_ctrl_set);
			break;
		}

		/* Enable the regulator first */
		writel(PLL_USB_REG_ENABLE_MASK,
		       &usbphy->usb1_pll_480_ctrl_set);

		/* Wait at least 15us */
		udelay(15);

		/* Enable the power */
		writel(PLL_USB_PWR_MASK, &usbphy->usb1_pll_480_ctrl_set);

		/* Wait lock */
		while (timeout--) {
			if (readl(&usbphy->usb1_pll_480_ctrl) &
			    PLL_USB_LOCK_MASK)
				break;
		}

		if (timeout <= 0) {
			/* If timeout, we power down the pll */
			writel(PLL_USB_PWR_MASK,
			       &usbphy->usb1_pll_480_ctrl_clr);
			return -ETIME;
		}
	}

	/* Clear the bypass */
	writel(PLL_USB_BYPASS_MASK, &usbphy->usb1_pll_480_ctrl_clr);

	/* Enable the PLL clock out to USB */
	writel((PLL_USB_EN_USB_CLKS_MASK | PLL_USB_ENABLE_MASK),
	       &usbphy->usb1_pll_480_ctrl_set);

	return 0;
}

u32 mxc_get_clock(enum mxc_clock clk)
{
	switch (clk) {
	case MXC_ESDHC_CLK:
		return pcc_clock_get_rate(4, SDHC0_PCC4_SLOT);
	case MXC_ESDHC2_CLK:
		return pcc_clock_get_rate(4, SDHC1_PCC4_SLOT);
	case MXC_ESDHC3_CLK:
		return pcc_clock_get_rate(4, SDHC2_PCC4_SLOT);
	case MXC_ARM_CLK:
		return cgc1_clk_get_rate(PLL2);
	default:
		return 0;
	}
}

u32 get_lpuart_clk(void)
{
	int index = 0;

	const u32 lpuart_array[] = {
		LPUART4_RBASE,
		LPUART5_RBASE,
		LPUART6_RBASE,
		LPUART7_RBASE,
	};

	const u32 lpuart_pcc_slots[] = {
		LPUART4_PCC3_SLOT,
		LPUART5_PCC3_SLOT,
		LPUART6_PCC4_SLOT,
		LPUART7_PCC4_SLOT,
	};

	const u32 lpuart_pcc[] = {
		3, 3, 4, 4,
	};

	for (index = 0; index < 4; index++) {
		if (lpuart_array[index] == LPUART_BASE)
			break;
	}

	if (index > 3)
		return 0;

	return pcc_clock_get_rate(lpuart_pcc[index], lpuart_pcc_slots[index]);
}

#ifndef CONFIG_SPL_BUILD
/*
 * Dump some core clockes.
 */
int do_mx8ulp_showclocks(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
{
	printf("SDHC0 %8d MHz\n", pcc_clock_get_rate(4, SDHC0_PCC4_SLOT) / 1000000);
	printf("SDHC1 %8d MHz\n", pcc_clock_get_rate(4, SDHC1_PCC4_SLOT) / 1000000);
	printf("SDHC2 %8d MHz\n", pcc_clock_get_rate(4, SDHC2_PCC4_SLOT) / 1000000);

	printf("SOSC %8d MHz\n", cgc1_clk_get_rate(SOSC) / 1000000);
	printf("FRO %8d MHz\n", cgc1_clk_get_rate(FRO) / 1000000);
	printf("PLL2 %8d MHz\n", cgc1_clk_get_rate(PLL2) / 1000000);
	printf("PLL3 %8d MHz\n", cgc1_clk_get_rate(PLL3) / 1000000);
	printf("PLL3_VCODIV %8d MHz\n", cgc1_clk_get_rate(PLL3_VCODIV) / 1000000);
	printf("PLL3_PFD0 %8d MHz\n", cgc1_clk_get_rate(PLL3_PFD0) / 1000000);
	printf("PLL3_PFD1 %8d MHz\n", cgc1_clk_get_rate(PLL3_PFD1) / 1000000);
	printf("PLL3_PFD2 %8d MHz\n", cgc1_clk_get_rate(PLL3_PFD2) / 1000000);
	printf("PLL3_PFD3 %8d MHz\n", cgc1_clk_get_rate(PLL3_PFD3) / 1000000);

	return 0;
}

U_BOOT_CMD(
	clocks,	CONFIG_SYS_MAXARGS, 1, do_mx8ulp_showclocks,
	"display clocks",
	""
);
#endif