xref: /openbmc/linux/arch/arm/mach-omap2/clock.c (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/mach-omap2/clock.c
 *
 *  Copyright (C) 2005-2008 Texas Instruments, Inc.
 *  Copyright (C) 2004-2010 Nokia Corporation
 *
 *  Contacts:
 *  Richard Woodruff <r-woodruff2@ti.com>
 *  Paul Walmsley
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/of_address.h>
#include <asm/cpu.h>

#include <trace/events/power.h>

#include "soc.h"
#include "clockdomain.h"
#include "clock.h"
#include "cm.h"
#include "cm2xxx.h"
#include "cm3xxx.h"
#include "cm-regbits-24xx.h"
#include "cm-regbits-34xx.h"
#include "common.h"

/* DPLL valid Fint frequency band limits - from 34xx TRM Section 4.7.6.2 */
#define OMAP3430_DPLL_FINT_BAND1_MIN	750000
#define OMAP3430_DPLL_FINT_BAND1_MAX	2100000
#define OMAP3430_DPLL_FINT_BAND2_MIN	7500000
#define OMAP3430_DPLL_FINT_BAND2_MAX	21000000

/*
 * DPLL valid Fint frequency range for OMAP36xx and OMAP4xxx.
 * From device data manual section 4.3 "DPLL and DLL Specifications".
 */
#define OMAP3PLUS_DPLL_FINT_MIN		32000
#define OMAP3PLUS_DPLL_FINT_MAX		52000000

struct ti_clk_ll_ops omap_clk_ll_ops = {
	.clkdm_clk_enable = clkdm_clk_enable,
	.clkdm_clk_disable = clkdm_clk_disable,
	.clkdm_lookup = clkdm_lookup,
	.cm_wait_module_ready = omap_cm_wait_module_ready,
	.cm_split_idlest_reg = cm_split_idlest_reg,
};

/**
 * omap2_clk_setup_ll_ops - setup clock driver low-level ops
 *
 * Sets up clock driver low-level platform ops. These are needed
 * for register accesses and various other misc platform operations.
 * Returns 0 on success, -EBUSY if low level ops have been registered
 * already.
 */
int __init omap2_clk_setup_ll_ops(void)
{
	return ti_clk_setup_ll_ops(&omap_clk_ll_ops);
}

/*
 * OMAP2+ specific clock functions
 */

/**
 * ti_clk_init_features - init clock features struct for the SoC
 *
 * Initializes the clock features struct based on the SoC type.
 */
void __init ti_clk_init_features(void)
{
	struct ti_clk_features features = { 0 };
	/* Fint setup for DPLLs */
	if (cpu_is_omap3430()) {
		features.fint_min = OMAP3430_DPLL_FINT_BAND1_MIN;
		features.fint_max = OMAP3430_DPLL_FINT_BAND2_MAX;
		features.fint_band1_max = OMAP3430_DPLL_FINT_BAND1_MAX;
		features.fint_band2_min = OMAP3430_DPLL_FINT_BAND2_MIN;
	} else {
		features.fint_min = OMAP3PLUS_DPLL_FINT_MIN;
		features.fint_max = OMAP3PLUS_DPLL_FINT_MAX;
	}

	/* Bypass value setup for DPLLs */
	if (cpu_is_omap24xx()) {
		features.dpll_bypass_vals |=
			(1 << OMAP2XXX_EN_DPLL_LPBYPASS) |
			(1 << OMAP2XXX_EN_DPLL_FRBYPASS);
	} else if (cpu_is_omap34xx()) {
		features.dpll_bypass_vals |=
			(1 << OMAP3XXX_EN_DPLL_LPBYPASS) |
			(1 << OMAP3XXX_EN_DPLL_FRBYPASS);
	} else if (soc_is_am33xx() || cpu_is_omap44xx() || soc_is_am43xx() ||
		   soc_is_omap54xx() || soc_is_dra7xx()) {
		features.dpll_bypass_vals |=
			(1 << OMAP4XXX_EN_DPLL_LPBYPASS) |
			(1 << OMAP4XXX_EN_DPLL_FRBYPASS) |
			(1 << OMAP4XXX_EN_DPLL_MNBYPASS);
	}

	/* Jitter correction only available on OMAP343X */
	if (cpu_is_omap343x())
		features.flags |= TI_CLK_DPLL_HAS_FREQSEL;

	if (omap_type() == OMAP2_DEVICE_TYPE_GP)
		features.flags |= TI_CLK_DEVICE_TYPE_GP;

	/* Idlest value for interface clocks.
	 * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
	 * 34xx reverses this, just to keep us on our toes
	 * AM35xx uses both, depending on the module.
	 */
	if (cpu_is_omap24xx())
		features.cm_idlest_val = OMAP24XX_CM_IDLEST_VAL;
	else if (cpu_is_omap34xx())
		features.cm_idlest_val = OMAP34XX_CM_IDLEST_VAL;

	/* On OMAP3430 ES1.0, DPLL4 can't be re-programmed */
	if (omap_rev() == OMAP3430_REV_ES1_0)
		features.flags |= TI_CLK_DPLL4_DENY_REPROGRAM;

	/* Errata I810 for omap5 / dra7 */
	if (soc_is_omap54xx() || soc_is_dra7xx())
		features.flags |= TI_CLK_ERRATA_I810;

	ti_clk_setup_features(&features);
}