arch/arm/mach-omap2/am33xx/sys_info.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * sys_info.c
 *
 * System information functions
 *
 * Copyright (C) 2011, Texas Instruments, Incorporated - https://www.ti.com/
 *
 * Derived from Beagle Board and 3430 SDP code by
 *      Richard Woodruff <r-woodruff2@ti.com>
 *      Syed Mohammed Khasim <khasim@ti.com>
 */

#include <init.h>
#include <asm/io.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
#include <power/tps65910.h>
#include <linux/compiler.h>

struct ctrl_stat *cstat = (struct ctrl_stat *)CTRL_BASE;

/**
 * get_cpu_rev(void) - extract rev info
 */
u32 get_cpu_rev(void)
{
	u32 id;
	u32 rev;

	id = readl(DEVICE_ID);
	rev = (id >> 28) & 0xff;

	return rev;
}

/**
 * get_cpu_type(void) - extract cpu info
 */
u32 get_cpu_type(void)
{
	u32 id = 0;
	u32 partnum;

	id = readl(DEVICE_ID);
	partnum = (id >> 12) & 0xffff;

	return partnum;
}

/**
 * get_sysboot_value(void) - return SYS_BOOT[4:0]
 */
u32 get_sysboot_value(void)
{
	return readl(&cstat->statusreg) & SYSBOOT_MASK;
}

u32 get_sys_clk_index(void)
{
	struct ctrl_stat *ctrl = (struct ctrl_stat *)CTRL_BASE;
	u32 ind = readl(&ctrl->statusreg);

#ifdef CONFIG_AM43XX
	u32 src;
	src = (ind & CTRL_CRYSTAL_FREQ_SRC_MASK) >> CTRL_CRYSTAL_FREQ_SRC_SHIFT;
	if (src == CTRL_CRYSTAL_FREQ_SRC_EFUSE) /* Value read from EFUSE */
		return ((ind & CTRL_CRYSTAL_FREQ_SELECTION_MASK) >>
			CTRL_CRYSTAL_FREQ_SELECTION_SHIFT);
	else /* Value read from SYS BOOT pins */
#endif
		return ((ind & CTRL_SYSBOOT_15_14_MASK) >>
			CTRL_SYSBOOT_15_14_SHIFT);
}

#ifdef CONFIG_DISPLAY_CPUINFO
static char *cpu_revs[] = {
		"1.0",
		"2.0",
		"2.1"};

static char *cpu_revs_am43xx[] = {
		"1.0",
		"1.1",
		"1.2"};

static char *dev_types[] = {
		"TST",
		"EMU",
		"HS",
		"GP"};

/**
 * Print CPU information
 */
int print_cpuinfo(void)
{
	char *cpu_s, *sec_s, *rev_s;
	char **cpu_rev_arr = cpu_revs;

	switch (get_cpu_type()) {
	case AM335X:
		cpu_s = "AM335X";
		break;
	case TI81XX:
		cpu_s = "TI81XX";
		break;
	case AM437X:
		cpu_s = "AM437X";
		cpu_rev_arr = cpu_revs_am43xx;
		break;
	default:
		cpu_s = "Unknown CPU type";
		break;
	}

	if (get_cpu_rev() < ARRAY_SIZE(cpu_revs))
		rev_s = cpu_rev_arr[get_cpu_rev()];
	else
		rev_s = "?";

	if (get_device_type() < ARRAY_SIZE(dev_types))
		sec_s = dev_types[get_device_type()];
	else
		sec_s = "?";

	printf("CPU  : %s-%s rev %s\n", cpu_s, sec_s, rev_s);

	return 0;
}
#endif	/* CONFIG_DISPLAY_CPUINFO */

#ifdef CONFIG_AM33XX
int am335x_get_efuse_mpu_max_freq(struct ctrl_dev *cdev)
{
	int sil_rev;

	sil_rev = readl(&cdev->deviceid) >> 28;

	if (sil_rev == 0) {
		/* No efuse in PG 1.0. Use max speed */
		return MPUPLL_M_720;
	} else if (sil_rev >= 1) {
		/* Check what the efuse says our max speed is. */
		int efuse_arm_mpu_max_freq, package_type;
		efuse_arm_mpu_max_freq = readl(&cdev->efuse_sma);
		package_type = (efuse_arm_mpu_max_freq & PACKAGE_TYPE_MASK) >>
				PACKAGE_TYPE_SHIFT;

		/* PG 2.0, efuse may not be set. */
		if (package_type == PACKAGE_TYPE_UNDEFINED || package_type ==
		    PACKAGE_TYPE_RESERVED)
			return MPUPLL_M_800;

		switch ((efuse_arm_mpu_max_freq & DEVICE_ID_MASK)) {
		case AM335X_ZCZ_1000:
			return MPUPLL_M_1000;
		case AM335X_ZCZ_800:
			return MPUPLL_M_800;
		case AM335X_ZCZ_720:
			return MPUPLL_M_720;
		case AM335X_ZCZ_600:
		case AM335X_ZCE_600:
			return MPUPLL_M_600;
		case AM335X_ZCZ_300:
		case AM335X_ZCE_300:
			return MPUPLL_M_300;
		}
	}

	/* unknown, use the PG1.0 max */
	return MPUPLL_M_720;
}

int am335x_get_mpu_vdd(int sil_rev, int frequency)
{
	int sel_mask = am335x_get_tps65910_mpu_vdd(sil_rev, frequency);

	switch (sel_mask) {
	case TPS65910_OP_REG_SEL_1_3_2_5:
		return 1325000;
	case TPS65910_OP_REG_SEL_1_2_0:
		return 1200000;
	case TPS65910_OP_REG_SEL_1_1_0:
		return 1100000;
	default:
		return 1262500;
	}
}

int am335x_get_tps65910_mpu_vdd(int sil_rev, int frequency)
{
	/* For PG2.0 and later, we have one set of values. */
	if (sil_rev >= 1) {
		switch (frequency) {
		case MPUPLL_M_1000:
			return TPS65910_OP_REG_SEL_1_3_2_5;
		case MPUPLL_M_800:
			return TPS65910_OP_REG_SEL_1_2_6;
		case MPUPLL_M_720:
			return TPS65910_OP_REG_SEL_1_2_0;
		case MPUPLL_M_600:
		case MPUPLL_M_500:
		case MPUPLL_M_300:
			return TPS65910_OP_REG_SEL_1_1_0;
		}
	}

	/* Default to PG1.0 values. */
	return TPS65910_OP_REG_SEL_1_2_6;
}
#endif