path: root/arch/powerpc/platforms/512x/clock-commonclk.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2013 DENX Software Engineering
 *
 * Gerhard Sittig, <gsi@denx.de>
 *
 * common clock driver support for the MPC512x platform
 */

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>

#include <asm/mpc5121.h>
#include <dt-bindings/clock/mpc512x-clock.h>

#include "mpc512x.h"		/* our public mpc5121_clk_init() API */

/* helpers to keep the MCLK intermediates "somewhere" in our table */
enum {
	MCLK_IDX_MUX0,
	MCLK_IDX_EN0,
	MCLK_IDX_DIV0,
	MCLK_MAX_IDX,
};

#define NR_PSCS			12
#define NR_MSCANS		4
#define NR_SPDIFS		1
#define NR_OUTCLK		4
#define NR_MCLKS		(NR_PSCS + NR_MSCANS + NR_SPDIFS + NR_OUTCLK)

/* extend the public set of clocks by adding internal slots for management */
enum {
	/* arrange for adjacent numbers after the public set */
	MPC512x_CLK_START_PRIVATE = MPC512x_CLK_LAST_PUBLIC,
	/* clocks which aren't announced to the public */
	MPC512x_CLK_DDR,
	MPC512x_CLK_MEM,
	MPC512x_CLK_IIM,
	/* intermediates in div+gate combos or fractional dividers */
	MPC512x_CLK_DDR_UG,
	MPC512x_CLK_SDHC_x4,
	MPC512x_CLK_SDHC_UG,
	MPC512x_CLK_SDHC2_UG,
	MPC512x_CLK_DIU_x4,
	MPC512x_CLK_DIU_UG,
	MPC512x_CLK_MBX_BUS_UG,
	MPC512x_CLK_MBX_UG,
	MPC512x_CLK_MBX_3D_UG,
	MPC512x_CLK_PCI_UG,
	MPC512x_CLK_NFC_UG,
	MPC512x_CLK_LPC_UG,
	MPC512x_CLK_SPDIF_TX_IN,
	/* intermediates for the mux+gate+div+mux MCLK generation */
	MPC512x_CLK_MCLKS_FIRST,
	MPC512x_CLK_MCLKS_LAST = MPC512x_CLK_MCLKS_FIRST
				+ NR_MCLKS * MCLK_MAX_IDX,
	/* internal, symbolic spec for the number of slots */
	MPC512x_CLK_LAST_PRIVATE,
};

/* data required for the OF clock provider registration */
static struct clk *clks[MPC512x_CLK_LAST_PRIVATE];
static struct clk_onecell_data clk_data;

/* CCM register access */
static struct mpc512x_ccm __iomem *clkregs;
static DEFINE_SPINLOCK(clklock);

/* SoC variants {{{ */

/*
 * tell SoC variants apart as they are rather similar yet not identical,
 * cache the result in an enum to not repeatedly run the expensive OF test
 *
 * MPC5123 is an MPC5121 without the MBX graphics accelerator
 *
 * MPC5125 has many more differences: no MBX, no AXE, no VIU, no SPDIF,
 * no PATA, no SATA, no PCI, two FECs (of different compatibility name),
 * only 10 PSCs (of different compatibility name), two SDHCs, different
 * NFC IP block, output clocks, system PLL status query, different CPMF
 * interpretation, no CFM, different fourth PSC/CAN mux0 input -- yet
 * those differences can get folded into this clock provider support
 * code and don't warrant a separate highly redundant implementation
 */

static enum soc_type {
	MPC512x_SOC_MPC5121,
	MPC512x_SOC_MPC5123,
	MPC512x_SOC_MPC5125,
} soc;

static void __init mpc512x_clk_determine_soc(void)
{
	if (of_machine_is_compatible("fsl,mpc5121")) {
		soc = MPC512x_SOC_MPC5121;
		return;
	}
	if (of_machine_is_compatible("fsl,mpc5123")) {
		soc = MPC512x_SOC_MPC5123;
		return;
	}
	if (of_machine_is_compatible("fsl,mpc5125")) {
		soc = MPC512x_SOC_MPC5125;
		return;
	}
}

static bool __init soc_has_mbx(void)
{
	if (soc == MPC512x_SOC_MPC5121)
		return true;
	return false;
}

static bool __init soc_has_axe(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return false;
	return true;
}

static bool __init soc_has_viu(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return false;
	return true;
}

static bool __init soc_has_spdif(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return false;
	return true;
}

static bool __init soc_has_pata(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return false;
	return true;
}

static bool __init soc_has_sata(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return false;
	return true;
}

static bool __init soc_has_pci(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return false;
	return true;
}

static bool __init soc_has_fec2(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return true;
	return false;
}

static int __init soc_max_pscnum(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return 10;
	return 12;
}

static bool __init soc_has_sdhc2(void)
{
	if (soc == MPC512x_SOC_MPC5125)
		return true;
	return false;
}

static bool __init soc_has_nfc_5125(void)
{
	if (so