Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 1351 insertions, 0 deletions

diff --git a/drivers/clk/versatile/Kconfig b/drivers/clk/versatile/Kconfig
new file mode 100644
index 000000000..8aa875f25
--- /dev/null
+++ b/drivers/clk/versatile/Kconfig
@@ -0,0 +1,32 @@
+config ICST
+	bool
+
+config COMMON_CLK_VERSATILE
+	bool "Clock driver for ARM Reference designs"
+	depends on ARCH_INTEGRATOR || ARCH_REALVIEW || \
+		ARCH_VERSATILE || ARCH_VEXPRESS || ARM64 || \
+		COMPILE_TEST
+	select REGMAP_MMIO
+	---help---
+          Supports clocking on ARM Reference designs:
+	  - Integrator/AP and Integrator/CP
+	  - RealView PB1176, EB, PB11MP and PBX
+	  - Versatile Express
+
+config CLK_SP810
+	bool "Clock driver for ARM SP810 System Controller"
+	depends on COMMON_CLK_VERSATILE
+	default y if ARCH_VEXPRESS
+	---help---
+	  Supports clock muxing (REFCLK/TIMCLK to TIMERCLKEN0-3) capabilities
+	  of the ARM SP810 System Controller cell.
+
+config CLK_VEXPRESS_OSC
+	bool "Clock driver for Versatile Express OSC clock generators"
+	depends on COMMON_CLK_VERSATILE
+	depends on VEXPRESS_CONFIG
+	default y if ARCH_VEXPRESS
+	---help---
+	  Simple regmap-based driver driving clock generators on Versatile
+	  Express platforms hidden behind its configuration infrastructure,
+	  commonly known as OSCs.
diff --git a/drivers/clk/versatile/Makefile b/drivers/clk/versatile/Makefile
new file mode 100644
index 000000000..58b54b814
--- /dev/null
+++ b/drivers/clk/versatile/Makefile
@@ -0,0 +1,5 @@
+# Makefile for Versatile-specific clocks
+obj-$(CONFIG_ICST)		+= icst.o clk-icst.o clk-versatile.o
+obj-$(CONFIG_INTEGRATOR_IMPD1)	+= clk-impd1.o
+obj-$(CONFIG_CLK_SP810)		+= clk-sp810.o
+obj-$(CONFIG_CLK_VEXPRESS_OSC)	+= clk-vexpress-osc.o
diff --git a/drivers/clk/versatile/clk-icst.c b/drivers/clk/versatile/clk-icst.c
new file mode 100644
index 000000000..dafe7a458
--- /dev/null
+++ b/drivers/clk/versatile/clk-icst.c
@@ -0,0 +1,578 @@
+/*
+ * Driver for the ICST307 VCO clock found in the ARM Reference designs.
+ * We wrap the custom interface from <asm/hardware/icst.h> into the generic
+ * clock framework.
+ *
+ * Copyright (C) 2012-2015 Linus Walleij
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * TODO: when all ARM reference designs are migrated to generic clocks, the
+ * ICST clock code from the ARM tree should probably be merged into this
+ * file.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#include "icst.h"
+#include "clk-icst.h"
+
+/* Magic unlocking token used on all Versatile boards */
+#define VERSATILE_LOCK_VAL	0xA05F
+
+#define VERSATILE_AUX_OSC_BITS 0x7FFFF
+#define INTEGRATOR_AP_CM_BITS 0xFF
+#define INTEGRATOR_AP_SYS_BITS 0xFF
+#define INTEGRATOR_CP_CM_CORE_BITS 0x7FF
+#define INTEGRATOR_CP_CM_MEM_BITS 0x7FF000
+
+#define INTEGRATOR_AP_PCI_25_33_MHZ BIT(8)
+
+/**
+ * enum icst_control_type - the type of ICST control register
+ */
+enum icst_control_type {
+	ICST_VERSATILE, /* The standard type, all control bits available */
+	ICST_INTEGRATOR_AP_CM, /* Only 8 bits of VDW available */
+	ICST_INTEGRATOR_AP_SYS, /* Only 8 bits of VDW available */
+	ICST_INTEGRATOR_AP_PCI, /* Odd bit pattern storage */
+	ICST_INTEGRATOR_CP_CM_CORE, /* Only 8 bits of VDW and 3 bits of OD */
+	ICST_INTEGRATOR_CP_CM_MEM, /* Only 8 bits of VDW and 3 bits of OD */
+};
+
+/**
+ * struct clk_icst - ICST VCO clock wrapper
+ * @hw: corresponding clock hardware entry
+ * @vcoreg: VCO register address
+ * @lockreg: VCO lock register address
+ * @params: parameters for this ICST instance
+ * @rate: current rate
+ * @ctype: the type of control register for the ICST
+ */
+struct clk_icst {
+	struct clk_hw hw;
+	struct regmap *map;
+	u32 vcoreg_off;
+	u32 lockreg_off;
+	struct icst_params *params;
+	unsigned long rate;
+	enum icst_control_type ctype;
+};
+
+#define to_icst(_hw) container_of(_hw, struct clk_icst, hw)
+
+/**
+ * vco_get() - get ICST VCO settings from a certain ICST
+ * @icst: the ICST clock to get
+ * @vco: the VCO struct to return the value in
+ */
+static int vco_get(struct clk_icst *icst, struct icst_vco *vco)
+{
+	u32 val;
+	int ret;
+
+	ret = regmap_read(icst->map, icst->vcoreg_off, &val);
+	if (ret)
+		return ret;
+
+	/*
+	 * The Integrator/AP core clock can only access the low eight
+	 * bits of the v PLL divider. Bit 8 is tied low and always zero,
+	 * r is hardwired to 22 and output divider s is hardwired to 1
+	 * (divide by 2) according to the document
+	 * "Integrator CM926EJ-S, CM946E-S, CM966E-S, CM1026EJ-S and
+	 * CM1136JF-S User Guide" ARM DUI 0138E, page 3-13 thru 3-14.
+	 */
+	if (icst->ctype == ICST_INTEGRATOR_AP_CM) {
+		vco->v = val & INTEGRATOR_AP_CM_BITS;
+		vco->r = 22;
+		vco->s = 1;
+		return 0;
+	}
+
+	/*
+	 * The Integrator/AP system clock on the base board can only
+	 * access the low eight bits of the v PLL divider. Bit 8 is tied low
+	 * and always zero, r is hardwired to 46, and the output divider is
+	 * hardwired to 3 (divide by 4) according to the document
+	 * "Integrator AP ASIC Development Motherboard" ARM DUI 0098B,
+	 * page 3-16.
+	 */
+	if (icst->ctype == ICST_INTEGRATOR_AP_SYS) {
+		vco->v = val & INTEGRATOR_AP_SYS_BITS;
+		vco->r = 46;
+		vco->s = 3;
+		return 0;
+	}
+
+	/*
+	 * The Integrator/AP PCI clock is using an odd pattern to create
+	 * the child clock, basically a single bit called DIVX/Y is used
+	 * to select between two different hardwired values: setting the
+	 * bit to 0 yields v = 17, r = 22 and OD = 1, whereas setting the
+	 * bit to 1 yields v = 14, r = 14 and OD = 1 giving the frequencies
+	 * 33 or 25 MHz respectively.
+	 */
+	if (icst->ctype == ICST_INTEGRATOR_AP_PCI) {
+		bool divxy = !!(val & INTEGRATOR_AP_PCI_25_33_MHZ);
+
+		vco->v = divxy ? 17 : 14;
+		vco->r = divxy ? 22 : 14;
+		vco->s = 1;
+		return 0;
+	}
+
+	/*
+	 * The Integrator/CP core clock can access the low eight bits
+	 * of the v PLL divider. Bit 8 is tied low and always zero,
+	 * r is hardwired to 22 and the output divider s is accessible
+	 * in bits 8 thru 10 according to the document
+	 * "Integrator/CM940T, CM920T, CM740T, and CM720T User Guide"
+	 * ARM DUI 0157A, page 3-20 thru 3-23 and 4-10.
+	 */
+	if (icst->ctype == ICST_INTEGRATOR_CP_CM_CORE) {
+		vco->v = val & 0xFF;
+		vco->r = 22;
+		vco->s = (val >> 8) & 7;
+		return 0;
+	}
+
+	if (icst->ctype == ICST_INTEGRATOR_CP_CM_MEM) {
+		vco->v = (val >> 12) & 0xFF;
+		vco->r = 22;
+		vco->s = (val >> 20) & 7;
+		return 0;
+	}
+
+	vco->v = val & 0x1ff;
+	vco->r = (val >> 9) & 0x7f;
+	vco->s = (val >> 16) & 03;
+	return 0;
+}
+
+/**
+ * vco_set() - commit changes to an ICST VCO
+ * @icst: the ICST clock to set
+ * @vco: the VCO struct to set the changes from
+ */
+static int vco_set(struct clk_icst *icst, struct icst_vco vco)
+{
+	u32 mask;
+	u32 val;
+	int ret;
+
+	/* Mask the bits used by the VCO */
+	switch (icst->ctype) {
+	case ICST_INTEGRATOR_AP_CM:
+		mask = INTEGRATOR_AP_CM_BITS;
+		val = vco.v & 0xFF;
+		if (vco.v & 0x100)
+			pr_err("ICST error: tried to set bit 8 of VDW\n");
+		if (vco.s != 1)
+			pr_err("ICST error: tried to use VOD != 1\n");
+		if (vco.r != 22)
+			pr_err("ICST error: tried to use RDW != 22\n");
+		break;
+	case ICST_INTEGRATOR_AP_SYS:
+		mask = INTEGRATOR_AP_SYS_BITS;
+		val = vco.v & 0xFF;
+		if (vco.v & 0x100)
+			pr_err("ICST error: tried to set bit 8 of VDW\n");
+		if (vco.s != 3)
+			pr_err("ICST error: tried to use VOD != 1\n");
+		if (vco.r != 46)
+			pr_err("ICST error: tried to use RDW != 22\n");
+		break;
+	case ICST_INTEGRATOR_CP_CM_CORE:
+		mask = INTEGRATOR_CP_CM_CORE_BITS; /* Uses 12 bits */
+		val = (vco.v & 0xFF) | vco.s << 8;
+		if (vco.v & 0x100)
+			pr_err("ICST error: tried to set bit 8 of VDW\n");
+		if (vco.r != 22)
+			pr_err("ICST error: tried to use RDW != 22\n");
+		break;
+	case ICST_INTEGRATOR_CP_CM_MEM:
+		mask = INTEGRATOR_CP_CM_MEM_BITS; /* Uses 12 bits */
+		val = ((vco.v & 0xFF) << 12) | (vco.s << 20);
+		if (vco.v & 0x100)
+			pr_err("ICST error: tried to set bit 8 of VDW\n");
+		if (vco.r != 22)
+			pr_err("ICST error: tried to use RDW != 22\n");
+		break;
+	default:
+		/* Regular auxilary oscillator */
+		mask = VERSATILE_AUX_OSC_BITS;
+		val = vco.v | (vco.r << 9) | (vco.s << 16);
+		break;
+	}
+
+	pr_debug("ICST: new val = 0x%08x\n", val);
+
+	/* This magic unlocks the VCO so it can be controlled */
+	ret = regmap_write(icst->map, icst->lockreg_off, VERSATILE_LOCK_VAL);
+	if (ret)
+		return ret;
+	ret = regmap_update_bits(icst->map, icst->vcoreg_off, mask, val);
+	if (ret)
+		return ret;
+	/* This locks the VCO again */
+	ret = regmap_write(icst->map, icst->lockreg_off, 0);
+	if (ret)
+		return ret;
+	return 0;
+}
+
+static unsigned long icst_recalc_rate(struct clk_hw *hw,
+				      unsigned long parent_rate)
+{
+	struct clk_icst *icst = to_icst(hw);
+	struct icst_vco vco;
+	int ret;
+
+	if (parent_rate)
+		icst->params->ref = parent_rate;
+	ret = vco_get(icst, &vco);
+	if (ret) {
+		pr_err("ICST: could not get VCO setting\n");
+		return 0;
+	}
+	icst->rate = icst_hz(icst->params, vco);
+	return icst->rate;
+}
+
+static long icst_round_rate(struct clk_hw *hw, unsigned long rate,
+			    unsigned long *prate)
+{
+	struct clk_icst *icst = to_icst(hw);
+	struct icst_vco vco;
+
+	if (icst->ctype == ICST_INTEGRATOR_AP_CM ||
+	    icst->ctype == ICST_INTEGRATOR_CP_CM_CORE) {
+		if (rate <= 12000000)
+			return 12000000;
+		if (rate >= 160000000)
+			return 160000000;
+		/* Slam to closest megahertz */
+		return DIV_ROUND_CLOSEST(rate, 1000000) * 1000000;
+	}
+
+	if (icst->ctype == ICST_INTEGRATOR_CP_CM_MEM) {
+		if (rate <= 6000000)
+			return 6000000;
+		if (rate >= 66000000)
+			return 66000000;
+		/* Slam to closest 0.5 megahertz */
+		return DIV_ROUND_CLOSEST(rate, 500000) * 500000;
+	}
+
+	if (icst->ctype == ICST_INTEGRATOR_AP_SYS) {
+		/* Divides between 3 and 50 MHz in steps of 0.25 MHz */
+		if (rate <= 3000000)
+			return 3000000;
+		if (rate >= 50000000)
+			return 5000000;
+		/* Slam to closest 0.25 MHz */
+		return DIV_ROUND_CLOSEST(rate, 250000) * 250000;
+	}
+
+	if (icst->ctype == ICST_INTEGRATOR_AP_PCI) {
+		/*
+		 * If we're below or less than halfway from 25 to 33 MHz
+		 * select 25 MHz
+		 */
+		if (rate <= 25000000 || rate < 29000000)
+			return 25000000;
+		/* Else just return the default frequency */
+		return 33000000;
+	}
+
+	vco = icst_hz_to_vco(icst->params, rate);
+	return icst_hz(icst->params, vco);
+}
+
+static int icst_set_rate(struct clk_hw *hw, unsigned long rate,
+			 unsigned long parent_rate)
+{
+	struct clk_icst *icst = to_icst(hw);
+	struct icst_vco vco;
+
+	if (icst->ctype == ICST_INTEGRATOR_AP_PCI) {
+		/* This clock is especially primitive */
+		unsigned int val;
+		int ret;
+
+		if (rate == 25000000) {
+			val = 0;
+		} else if (rate == 33000000) {
+			val = INTEGRATOR_AP_PCI_25_33_MHZ;
+		} else {
+			pr_err("ICST: cannot set PCI frequency %lu\n",
+			       rate);
+			return -EINVAL;
+		}
+		ret = regmap_write(icst->map, icst->lockreg_off,
+				   VERSATILE_LOCK_VAL);
+		if (ret)
+			return ret;
+		ret = regmap_update_bits(icst->map, icst->vcoreg_off,
+					 INTEGRATOR_AP_PCI_25_33_MHZ,
+					 val);
+		if (ret)
+			return ret;
+		/* This locks the VCO again */
+		ret = regmap_write(icst->map, icst->lockreg_off, 0);
+		if (ret)
+			return ret;
+		return 0;
+	}
+
+	if (parent_rate)
+		icst->params->ref = parent_rate;
+	vco = icst_hz_to_vco(icst->params, rate);
+	icst->rate = icst_hz(icst->params, vco);
+	return vco_set(icst, vco);
+}
+
+static const struct clk_ops icst_ops = {
+	.recalc_rate = icst_recalc_rate,
+	.round_rate = icst_round_rate,
+	.set_rate = icst_set_rate,
+};
+
+static struct clk *icst_clk_setup(struct device *dev,
+				  const struct clk_icst_desc *desc,
+				  const char *name,
+				  const char *parent_name,
+				  struct regmap *map,
+				  enum icst_control_type ctype)
+{
+	struct clk *clk;
+	struct clk_icst *icst;
+	struct clk_init_data init;
+	struct icst_params *pclone;
+
+	icst = kzalloc(sizeof(*icst), GFP_KERNEL);
+	if (!icst)
+		return ERR_PTR(-ENOMEM);
+
+	pclone = kmemdup(desc->params, sizeof(*pclone), GFP_KERNEL);
+	if (!pclone) {
+		kfree(icst);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	init.name = name;
+	init.ops = &icst_ops;
+	init.flags = 0;
+	init.parent_names = (parent_name ? &parent_name : NULL);
+	init.num_parents = (parent_name ? 1 : 0);
+	icst->map = map;
+	icst->hw.init = &init;
+	icst->params = pclone;
+	icst->vcoreg_off = desc->vco_offset;
+	icst->lockreg_off = desc->lock_offset;
+	icst->ctype = ctype;
+
+	clk = clk_register(dev, &icst->hw);
+	if (IS_ERR(clk)) {
+		kfree(pclone);
+		kfree(icst);
+	}
+
+	return clk;
+}
+
+struct clk *icst_clk_register(struct device *dev,
+			const struct clk_icst_desc *desc,
+			const char *name,
+			const char *parent_name,
+			void __iomem *base)
+{
+	struct regmap_config icst_regmap_conf = {
+		.reg_bits = 32,
+		.val_bits = 32,
+		.reg_stride = 4,
+	};
+	struct regmap *map;
+
+	map = regmap_init_mmio(dev, base, &icst_regmap_conf);
+	if (IS_ERR(map)) {
+		pr_err("could not initialize ICST regmap\n");
+		return ERR_CAST(map);
+	}
+	return icst_clk_setup(dev, desc, name, parent_name, map,
+			      ICST_VERSATILE);
+}
+EXPORT_SYMBOL_GPL(icst_clk_register);
+
+#ifdef CONFIG_OF
+/*
+ * In a device tree, an memory-mapped ICST clock appear as a child
+ * of a syscon node. Assume this and probe it only as a child of a
+ * syscon.
+ */
+
+static const struct icst_params icst525_params = {
+	.vco_max	= ICST525_VCO_MAX_5V,
+	.vco_min	= ICST525_VCO_MIN,
+	.vd_min		= 8,
+	.vd_max		= 263,
+	.rd_min		= 3,
+	.rd_max		= 65,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static const struct icst_params icst307_params = {
+	.vco_max	= ICST307_VCO_MAX,
+	.vco_min	= ICST307_VCO_MIN,
+	.vd_min		= 4 + 8,
+	.vd_max		= 511 + 8,
+	.rd_min		= 1 + 2,
+	.rd_max		= 127 + 2,
+	.s2div		= icst307_s2div,
+	.idx2s		= icst307_idx2s,
+};
+
+/**
+ * The core modules on the Integrator/AP and Integrator/CP have
+ * especially crippled ICST525 control.
+ */
+static const struct icst_params icst525_apcp_cm_params = {
+	.vco_max	= ICST525_VCO_MAX_5V,
+	.vco_min	= ICST525_VCO_MIN,
+	/* Minimum 12 MHz, VDW = 4 */
+	.vd_min		= 12,
+	/*
+	 * Maximum 160 MHz, VDW = 152 for all core modules, but
+	 * CM926EJ-S, CM1026EJ-S and CM1136JF-S can actually
+	 * go to 200 MHz (max VDW = 192).
+	 */
+	.vd_max		= 192,
+	/* r is hardcoded to 22 and this is the actual divisor, +2 */
+	.rd_min		= 24,
+	.rd_max		= 24,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static const struct icst_params icst525_ap_sys_params = {
+	.vco_max	= ICST525_VCO_MAX_5V,
+	.vco_min	= ICST525_VCO_MIN,
+	/* Minimum 3 MHz, VDW = 4 */
+	.vd_min		= 3,
+	/* Maximum 50 MHz, VDW = 192 */
+	.vd_max		= 50,
+	/* r is hardcoded to 46 and this is the actual divisor, +2 */
+	.rd_min		= 48,
+	.rd_max		= 48,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static const struct icst_params icst525_ap_pci_params = {
+	.vco_max	= ICST525_VCO_MAX_5V,
+	.vco_min	= ICST525_VCO_MIN,
+	/* Minimum 25 MHz */
+	.vd_min		= 25,
+	/* Maximum 33 MHz */
+	.vd_max		= 33,
+	/* r is hardcoded to 14 or 22 and this is the actual divisors +2 */
+	.rd_min		= 16,
+	.rd_max		= 24,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static void __init of_syscon_icst_setup(struct device_node *np)
+{
+	struct device_node *parent;
+	struct regmap *map;
+	struct clk_icst_desc icst_desc;
+	const char *name = np->name;
+	const char *parent_name;
+	struct clk *regclk;
+	enum icst_control_type ctype;
+
+	/* We do not release this reference, we are using it perpetually */
+	parent = of_get_parent(np);
+	if (!parent) {
+		pr_err("no parent node for syscon ICST clock\n");
+		return;
+	}
+	map = syscon_node_to_regmap(parent);
+	if (IS_ERR(map)) {
+		pr_err("no regmap for syscon ICST clock parent\n");
+		return;
+	}
+
+	if (of_property_read_u32(np, "vco-offset", &icst_desc.vco_offset)) {
+		pr_err("no VCO register offset for ICST clock\n");
+		return;
+	}
+	if (of_property_read_u32(np, "lock-offset", &icst_desc.lock_offset)) {
+		pr_err("no lock register offset for ICST clock\n");
+		return;
+	}
+
+	if (of_device_is_compatible(np, "arm,syscon-icst525")) {
+		icst_desc.params = &icst525_params;
+		ctype = ICST_VERSATILE;
+	} else if (of_device_is_compatible(np, "arm,syscon-icst307")) {
+		icst_desc.params = &icst307_params;
+		ctype = ICST_VERSATILE;
+	} else if (of_device_is_compatible(np, "arm,syscon-icst525-integratorap-cm")) {
+		icst_desc.params = &icst525_apcp_cm_params;
+		ctype = ICST_INTEGRATOR_AP_CM;
+	} else if (of_device_is_compatible(np, "arm,syscon-icst525-integratorap-sys")) {
+		icst_desc.params = &icst525_ap_sys_params;
+		ctype = ICST_INTEGRATOR_AP_SYS;
+	} else if (of_device_is_compatible(np, "arm,syscon-icst525-integratorap-pci")) {
+		icst_desc.params = &icst525_ap_pci_params;
+		ctype = ICST_INTEGRATOR_AP_PCI;
+	} else if (of_device_is_compatible(np, "arm,syscon-icst525-integratorcp-cm-core")) {
+		icst_desc.params = &icst525_apcp_cm_params;
+		ctype = ICST_INTEGRATOR_CP_CM_CORE;
+	} else if (of_device_is_compatible(np, "arm,syscon-icst525-integratorcp-cm-mem")) {
+		icst_desc.params = &icst525_apcp_cm_params;
+		ctype = ICST_INTEGRATOR_CP_CM_MEM;
+	} else {
+		pr_err("unknown ICST clock %s\n", name);
+		return;
+	}
+
+	/* Parent clock name is not the same as node parent */
+	parent_name = of_clk_get_parent_name(np, 0);
+
+	regclk = icst_clk_setup(NULL, &icst_desc, name, parent_name, map, ctype);
+	if (IS_ERR(regclk)) {
+		pr_err("error setting up syscon ICST clock %s\n", name);
+		return;
+	}
+	of_clk_add_provider(np, of_clk_src_simple_get, regclk);
+	pr_debug("registered syscon ICST clock %s\n", name);
+}
+
+CLK_OF_DECLARE(arm_syscon_icst525_clk,
+	       "arm,syscon-icst525", of_syscon_icst_setup);
+CLK_OF_DECLARE(arm_syscon_icst307_clk,
+	       "arm,syscon-icst307", of_syscon_icst_setup);
+CLK_OF_DECLARE(arm_syscon_integratorap_cm_clk,
+	       "arm,syscon-icst525-integratorap-cm", of_syscon_icst_setup);
+CLK_OF_DECLARE(arm_syscon_integratorap_sys_clk,
+	       "arm,syscon-icst525-integratorap-sys", of_syscon_icst_setup);
+CLK_OF_DECLARE(arm_syscon_integratorap_pci_clk,
+	       "arm,syscon-icst525-integratorap-pci", of_syscon_icst_setup);
+CLK_OF_DECLARE(arm_syscon_integratorcp_cm_core_clk,
+	       "arm,syscon-icst525-integratorcp-cm-core", of_syscon_icst_setup);
+CLK_OF_DECLARE(arm_syscon_integratorcp_cm_mem_clk,
+	       "arm,syscon-icst525-integratorcp-cm-mem", of_syscon_icst_setup);
+#endif
diff --git a/drivers/clk/versatile/clk-icst.h b/drivers/clk/versatile/clk-icst.h
new file mode 100644
index 000000000..e36ca1a20
--- /dev/null
+++ b/drivers/clk/versatile/clk-icst.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/**
+ * struct clk_icst_desc - descriptor for the ICST VCO
+ * @params: ICST parameters
+ * @vco_offset: offset to the ICST VCO from the provided memory base
+ * @lock_offset: offset to the ICST VCO locking register from the provided
+ *	memory base
+ */
+struct clk_icst_desc {
+	const struct icst_params *params;
+	u32 vco_offset;
+	u32 lock_offset;
+};
+
+struct clk *icst_clk_register(struct device *dev,
+			      const struct clk_icst_desc *desc,
+			      const char *name,
+			      const char *parent_name,
+			      void __iomem *base);
diff --git a/drivers/clk/versatile/clk-impd1.c b/drivers/clk/versatile/clk-impd1.c
new file mode 100644
index 000000000..401558bfc
--- /dev/null
+++ b/drivers/clk/versatile/clk-impd1.c
@@ -0,0 +1,180 @@
+/*
+ * Clock driver for the ARM Integrator/IM-PD1 board
+ * Copyright (C) 2012-2013 Linus Walleij
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_data/clk-integrator.h>
+
+#include "icst.h"
+#include "clk-icst.h"
+
+#define IMPD1_OSC1	0x00
+#define IMPD1_OSC2	0x04
+#define IMPD1_LOCK	0x08
+
+struct impd1_clk {
+	char *pclkname;
+	struct clk *pclk;
+	char *vco1name;
+	struct clk *vco1clk;
+	char *vco2name;
+	struct clk *vco2clk;
+	struct clk *mmciclk;
+	char *uartname;
+	struct clk *uartclk;
+	char *spiname;
+	struct clk *spiclk;
+	char *scname;
+	struct clk *scclk;
+	struct clk_lookup *clks[15];
+};
+
+/* One entry for each connected IM-PD1 LM */
+static struct impd1_clk impd1_clks[4];
+
+/*
+ * There are two VCO's on the IM-PD1
+ */
+
+static const struct icst_params impd1_vco1_params = {
+	.ref		= 24000000,	/* 24 MHz */
+	.vco_max	= ICST525_VCO_MAX_3V,
+	.vco_min	= ICST525_VCO_MIN,
+	.vd_min		= 12,
+	.vd_max		= 519,
+	.rd_min		= 3,
+	.rd_max		= 120,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static const struct clk_icst_desc impd1_icst1_desc = {
+	.params = &impd1_vco1_params,
+	.vco_offset = IMPD1_OSC1,
+	.lock_offset = IMPD1_LOCK,
+};
+
+static const struct icst_params impd1_vco2_params = {
+	.ref		= 24000000,	/* 24 MHz */
+	.vco_max	= ICST525_VCO_MAX_3V,
+	.vco_min	= ICST525_VCO_MIN,
+	.vd_min		= 12,
+	.vd_max		= 519,
+	.rd_min		= 3,
+	.rd_max		= 120,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static const struct clk_icst_desc impd1_icst2_desc = {
+	.params = &impd1_vco2_params,
+	.vco_offset = IMPD1_OSC2,
+	.lock_offset = IMPD1_LOCK,
+};
+
+/**
+ * integrator_impd1_clk_init() - set up the integrator clock tree
+ * @base: base address of the logic module (LM)
+ * @id: the ID of this LM
+ */
+void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
+{
+	struct impd1_clk *imc;
+	struct clk *clk;
+	struct clk *pclk;
+	int i;
+
+	if (id > 3) {
+		pr_crit("no more than 4 LMs can be attached\n");
+		return;
+	}
+	imc = &impd1_clks[id];
+
+	/* Register the fixed rate PCLK */
+	imc->pclkname = kasprintf(GFP_KERNEL, "lm%x-pclk", id);
+	pclk = clk_register_fixed_rate(NULL, imc->pclkname, NULL, 0, 0);
+	imc->pclk = pclk;
+
+	imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
+	clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, NULL,
+				base);
+	imc->vco1clk = clk;
+	imc->clks[0] = clkdev_alloc(pclk, "apb_pclk", "lm%x:01000", id);
+	imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
+
+	/* VCO2 is also called "CLK2" */
+	imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
+	clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, NULL,
+				base);
+	imc->vco2clk = clk;
+
+	/* MMCI uses CLK2 right off */
+	imc->clks[2] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00700", id);
+	imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
+
+	/* UART reference clock divides CLK2 by a fixed factor 4 */
+	imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
+	clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
+				   CLK_IGNORE_UNUSED, 1, 4);
+	imc->uartclk = clk;
+	imc->clks[4] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00100", id);
+	imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
+	imc->clks[6] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00200", id);
+	imc->clks[7] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
+
+	/* SPI PL022 clock divides CLK2 by a fixed factor 64 */
+	imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
+	clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
+				   CLK_IGNORE_UNUSED, 1, 64);
+	imc->clks[8] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00300", id);
+	imc->clks[9] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
+
+	/* The GPIO blocks and AACI have only PCLK */
+	imc->clks[10] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00400", id);
+	imc->clks[11] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00500", id);
+	imc->clks[12] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00800", id);
+
+	/* Smart Card clock divides CLK2 by a fixed factor 4 */
+	imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
+	clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
+				   CLK_IGNORE_UNUSED, 1, 4);
+	imc->scclk = clk;
+	imc->clks[13] = clkdev_alloc(pclk, "apb_pclk", "lm%x:00600", id);
+	imc->clks[14] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
+
+	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
+		clkdev_add(imc->clks[i]);
+}
+EXPORT_SYMBOL_GPL(integrator_impd1_clk_init);
+
+void integrator_impd1_clk_exit(unsigned int id)
+{
+	int i;
+	struct impd1_clk *imc;
+
+	if (id > 3)
+		return;
+	imc = &impd1_clks[id];
+
+	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
+		clkdev_drop(imc->clks[i]);
+	clk_unregister(imc->spiclk);
+	clk_unregister(imc->uartclk);
+	clk_unregister(imc->vco2clk);
+	clk_unregister(imc->vco1clk);
+	clk_unregister(imc->pclk);
+	kfree(imc->scname);
+	kfree(imc->spiname);
+	kfree(imc->uartname);
+	kfree(imc->vco2name);
+	kfree(imc->vco1name);
+	kfree(imc->pclkname);
+}
+EXPORT_SYMBOL_GPL(integrator_impd1_clk_exit);
diff --git a/drivers/clk/versatile/clk-sp810.c b/drivers/clk/versatile/clk-sp810.c
new file mode 100644
index 000000000..1fe1e8d97
--- /dev/null
+++ b/drivers/clk/versatile/clk-sp810.c
@@ -0,0 +1,144 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2013 ARM Limited
+ */
+
+#include <linux/amba/sp810.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#define to_clk_sp810_timerclken(_hw) \
+		container_of(_hw, struct clk_sp810_timerclken, hw)
+
+struct clk_sp810;
+
+struct clk_sp810_timerclken {
+	struct clk_hw hw;
+	struct clk *clk;
+	struct clk_sp810 *sp810;
+	int channel;
+};
+
+struct clk_sp810 {
+	struct device_node *node;
+	void __iomem *base;
+	spinlock_t lock;
+	struct clk_sp810_timerclken timerclken[4];
+};
+
+static u8 clk_sp810_timerclken_get_parent(struct clk_hw *hw)
+{
+	struct clk_sp810_timerclken *timerclken = to_clk_sp810_timerclken(hw);
+	u32 val = readl(timerclken->sp810->base + SCCTRL);
+
+	return !!(val & (1 << SCCTRL_TIMERENnSEL_SHIFT(timerclken->channel)));
+}
+
+static int clk_sp810_timerclken_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct clk_sp810_timerclken *timerclken = to_clk_sp810_timerclken(hw);
+	struct clk_sp810 *sp810 = timerclken->sp810;
+	u32 val, shift = SCCTRL_TIMERENnSEL_SHIFT(timerclken->channel);
+	unsigned long flags = 0;
+
+	if (WARN_ON(index > 1))
+		return -EINVAL;
+
+	spin_lock_irqsave(&sp810->lock, flags);
+
+	val = readl(sp810->base + SCCTRL);
+	val &= ~(1 << shift);
+	val |= index << shift;
+	writel(val, sp810->base + SCCTRL);
+
+	spin_unlock_irqrestore(&sp810->lock, flags);
+
+	return 0;
+}
+
+static const struct clk_ops clk_sp810_timerclken_ops = {
+	.get_parent = clk_sp810_timerclken_get_parent,
+	.set_parent = clk_sp810_timerclken_set_parent,
+};
+
+static struct clk *clk_sp810_timerclken_of_get(struct of_phandle_args *clkspec,
+		void *data)
+{
+	struct clk_sp810 *sp810 = data;
+
+	if (WARN_ON(clkspec->args_count != 1 ||
+		    clkspec->args[0] >=	ARRAY_SIZE(sp810->timerclken)))
+		return NULL;
+
+	return sp810->timerclken[clkspec->args[0]].clk;
+}
+
+static void __init clk_sp810_of_setup(struct device_node *node)
+{
+	struct clk_sp810 *sp810 = kzalloc(sizeof(*sp810), GFP_KERNEL);
+	const char *parent_names[2];
+	int num = ARRAY_SIZE(parent_names);
+	char name[12];
+	struct clk_init_data init;
+	static int instance;
+	int i;
+	bool deprecated;
+
+	if (!sp810)
+		return;
+
+	if (of_clk_parent_fill(node, parent_names, num) != num) {
+		pr_warn("Failed to obtain parent clocks for SP810!\n");
+		kfree(sp810);
+		return;
+	}
+
+	sp810->node = node;
+	sp810->base = of_iomap(node, 0);
+	spin_lock_init(&sp810->lock);
+
+	init.name = name;
+	init.ops = &clk_sp810_timerclken_ops;
+	init.flags = CLK_IS_BASIC;
+	init.parent_names = parent_names;
+	init.num_parents = num;
+
+	deprecated = !of_find_property(node, "assigned-clock-parents", NULL);
+
+	for (i = 0; i < ARRAY_SIZE(sp810->timerclken); i++) {
+		snprintf(name, sizeof(name), "sp810_%d_%d", instance, i);
+
+		sp810->timerclken[i].sp810 = sp810;
+		sp810->timerclken[i].channel = i;
+		sp810->timerclken[i].hw.init = &init;
+
+		/*
+		 * If DT isn't setting the parent, force it to be
+		 * the 1 MHz clock without going through the framework.
+		 * We do this before clk_register() so that it can determine
+		 * the parent and setup the tree properly.
+		 */
+		if (deprecated)
+			init.ops->set_parent(&sp810->timerclken[i].hw, 1);
+
+		sp810->timerclken[i].clk = clk_register(NULL,
+				&sp810->timerclken[i].hw);
+		WARN_ON(IS_ERR(sp810->timerclken[i].clk));
+	}
+
+	of_clk_add_provider(node, clk_sp810_timerclken_of_get, sp810);
+	instance++;
+}
+CLK_OF_DECLARE(sp810, "arm,sp810", clk_sp810_of_setup);
diff --git a/drivers/clk/versatile/clk-versatile.c b/drivers/clk/versatile/clk-versatile.c
new file mode 100644
index 000000000..d6960de64
--- /dev/null
+++ b/drivers/clk/versatile/clk-versatile.c
@@ -0,0 +1,100 @@
+/*
+ * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
+ * Versatile PB boards.
+ * Copyright (C) 2012 Linus Walleij
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "icst.h"
+#include "clk-icst.h"
+
+#define INTEGRATOR_HDR_LOCK_OFFSET	0x14
+
+#define VERSATILE_SYS_OSCCLCD_OFFSET	0x1c
+#define VERSATILE_SYS_LOCK_OFFSET	0x20
+
+/* Base offset for the core module */
+static void __iomem *cm_base;
+
+static const struct icst_params cp_auxosc_params = {
+	.vco_max	= ICST525_VCO_MAX_5V,
+	.vco_min	= ICST525_VCO_MIN,
+	.vd_min 	= 8,
+	.vd_max 	= 263,
+	.rd_min 	= 3,
+	.rd_max 	= 65,
+	.s2div		= icst525_s2div,
+	.idx2s		= icst525_idx2s,
+};
+
+static const struct clk_icst_desc cm_auxosc_desc __initconst = {
+	.params = &cp_auxosc_params,
+	.vco_offset = 0x1c,
+	.lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
+};
+
+static const struct icst_params versatile_auxosc_params = {
+	.vco_max	= ICST307_VCO_MAX,
+	.vco_min	= ICST307_VCO_MIN,
+	.vd_min		= 4 + 8,
+	.vd_max		= 511 + 8,
+	.rd_min		= 1 + 2,
+	.rd_max		= 127 + 2,
+	.s2div		= icst307_s2div,
+	.idx2s		= icst307_idx2s,
+};
+
+static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
+	.params = &versatile_auxosc_params,
+	.vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
+	.lock_offset = VERSATILE_SYS_LOCK_OFFSET,
+};
+static void __init cm_osc_setup(struct device_node *np,
+				const struct clk_icst_desc *desc)
+{
+	struct clk *clk = ERR_PTR(-EINVAL);
+	const char *clk_name = np->name;
+	const char *parent_name;
+
+	if (!cm_base) {
+		/* Remap the core module base if not done yet */
+		struct device_node *parent;
+
+		parent = of_get_parent(np);
+		if (!parent) {
+			pr_err("no parent on core module clock\n");
+			return;
+		}
+		cm_base = of_iomap(parent, 0);
+		if (!cm_base) {
+			pr_err("could not remap core module base\n");
+			return;
+		}
+	}
+
+	parent_name = of_clk_get_parent_name(np, 0);
+	clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
+	if (!IS_ERR(clk))
+		of_clk_add_provider(np, of_clk_src_simple_get, clk);
+}
+
+static void __init of_integrator_cm_osc_setup(struct device_node *np)
+{
+	cm_osc_setup(np, &cm_auxosc_desc);
+}
+CLK_OF_DECLARE(integrator_cm_auxosc_clk,
+	"arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
+
+static void __init of_versatile_cm_osc_setup(struct device_node *np)
+{
+	cm_osc_setup(np, &versatile_auxosc_desc);
+}
+CLK_OF_DECLARE(versatile_cm_auxosc_clk,
+	       "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
diff --git a/drivers/clk/versatile/clk-vexpress-osc.c b/drivers/clk/versatile/clk-vexpress-osc.c
new file mode 100644
index 000000000..dd08ecb49
--- /dev/null
+++ b/drivers/clk/versatile/clk-vexpress-osc.c
@@ -0,0 +1,131 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2012 ARM Limited
+ */
+
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/vexpress.h>
+
+struct vexpress_osc {
+	struct regmap *reg;
+	struct clk_hw hw;
+	unsigned long rate_min;
+	unsigned long rate_max;
+};
+
+#define to_vexpress_osc(osc) container_of(osc, struct vexpress_osc, hw)
+
+static unsigned long vexpress_osc_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct vexpress_osc *osc = to_vexpress_osc(hw);
+	u32 rate;
+
+	regmap_read(osc->reg, 0, &rate);
+
+	return rate;
+}
+
+static long vexpress_osc_round_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long *parent_rate)
+{
+	struct vexpress_osc *osc = to_vexpress_osc(hw);
+
+	if (osc->rate_min && rate < osc->rate_min)
+		rate = osc->rate_min;
+
+	if (osc->rate_max && rate > osc->rate_max)
+		rate = osc->rate_max;
+
+	return rate;
+}
+
+static int vexpress_osc_set_rate(struct clk_hw *hw, unsigned long rate,
+		unsigned long parent_rate)
+{
+	struct vexpress_osc *osc = to_vexpress_osc(hw);
+
+	return regmap_write(osc->reg, 0, rate);
+}
+
+static const struct clk_ops vexpress_osc_ops = {
+	.recalc_rate = vexpress_osc_recalc_rate,
+	.round_rate = vexpress_osc_round_rate,
+	.set_rate = vexpress_osc_set_rate,
+};
+
+
+static int vexpress_osc_probe(struct platform_device *pdev)
+{
+	struct clk_init_data init;
+	struct vexpress_osc *osc;
+	struct clk *clk;
+	u32 range[2];
+
+	osc = devm_kzalloc(&pdev->dev, sizeof(*osc), GFP_KERNEL);
+	if (!osc)
+		return -ENOMEM;
+
+	osc->reg = devm_regmap_init_vexpress_config(&pdev->dev);
+	if (IS_ERR(osc->reg))
+		return PTR_ERR(osc->reg);
+
+	if (of_property_read_u32_array(pdev->dev.of_node, "freq-range", range,
+			ARRAY_SIZE(range)) == 0) {
+		osc->rate_min = range[0];
+		osc->rate_max = range[1];
+	}
+
+	if (of_property_read_string(pdev->dev.of_node, "clock-output-names",
+			&init.name) != 0)
+		init.name = dev_name(&pdev->dev);
+
+	init.ops = &vexpress_osc_ops;
+	init.flags = 0;
+	init.num_parents = 0;
+
+	osc->hw.init = &init;
+
+	clk = clk_register(NULL, &osc->hw);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get, clk);
+	clk_hw_set_rate_range(&osc->hw, osc->rate_min, osc->rate_max);
+
+	dev_dbg(&pdev->dev, "Registered clock '%s'\n", init.name);
+
+	return 0;
+}
+
+static const struct of_device_id vexpress_osc_of_match[] = {
+	{ .compatible = "arm,vexpress-osc", },
+	{}
+};
+
+static struct platform_driver vexpress_osc_driver = {
+	.driver	= {
+		.name = "vexpress-osc",
+		.of_match_table = vexpress_osc_of_match,
+	},
+	.probe = vexpress_osc_probe,
+};
+
+static int __init vexpress_osc_init(void)
+{
+	return platform_driver_register(&vexpress_osc_driver);
+}
+core_initcall(vexpress_osc_init);
diff --git a/drivers/clk/versatile/icst.c b/drivers/clk/versatile/icst.c
new file mode 100644
index 000000000..de2af63a3
--- /dev/null
+++ b/drivers/clk/versatile/icst.c
@@ -0,0 +1,105 @@
+/*
+ *  linux/arch/arm/common/icst307.c
+ *
+ *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Support functions for calculating clocks/divisors for the ICST307
+ *  clock generators.  See http://www.idt.com/ for more information
+ *  on these devices.
+ *
+ *  This is an almost identical implementation to the ICST525 clock generator.
+ *  The s2div and idx2s files are different
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <asm/div64.h>
+#include "icst.h"
+
+/*
+ * Divisors for each OD setting.
+ */
+const unsigned char icst307_s2div[8] = { 10, 2, 8, 4, 5, 7, 3, 6 };
+const unsigned char icst525_s2div[8] = { 10, 2, 8, 4, 5, 7, 9, 6 };
+EXPORT_SYMBOL(icst307_s2div);
+EXPORT_SYMBOL(icst525_s2div);
+
+unsigned long icst_hz(const struct icst_params *p, struct icst_vco vco)
+{
+	u64 dividend = p->ref * 2 * (u64)(vco.v + 8);
+	u32 divisor = (vco.r + 2) * p->s2div[vco.s];
+
+	do_div(dividend, divisor);
+	return (unsigned long)dividend;
+}
+
+EXPORT_SYMBOL(icst_hz);
+
+/*
+ * Ascending divisor S values.
+ */
+const unsigned char icst307_idx2s[8] = { 1, 6, 3, 4, 7, 5, 2, 0 };
+const unsigned char icst525_idx2s[8] = { 1, 3, 4, 7, 5, 2, 6, 0 };
+EXPORT_SYMBOL(icst307_idx2s);
+EXPORT_SYMBOL(icst525_idx2s);
+
+struct icst_vco
+icst_hz_to_vco(const struct icst_params *p, unsigned long freq)
+{
+	struct icst_vco vco = { .s = 1, .v = p->vd_max, .r = p->rd_max };
+	unsigned long f;
+	unsigned int i = 0, rd, best = (unsigned int)-1;
+
+	/*
+	 * First, find the PLL output divisor such
+	 * that the PLL output is within spec.
+	 */
+	do {
+		f = freq * p->s2div[p->idx2s[i]];
+
+		if (f > p->vco_min && f <= p->vco_max)
+			break;
+		i++;
+	} while (i < 8);
+
+	if (i >= 8)
+		return vco;
+
+	vco.s = p->idx2s[i];
+
+	/*
+	 * Now find the closest divisor combination
+	 * which gives a PLL output of 'f'.
+	 */
+	for (rd = p->rd_min; rd <= p->rd_max; rd++) {
+		unsigned long fref_div, f_pll;
+		unsigned int vd;
+		int f_diff;
+
+		fref_div = (2 * p->ref) / rd;
+
+		vd = (f + fref_div / 2) / fref_div;
+		if (vd < p->vd_min || vd > p->vd_max)
+			continue;
+
+		f_pll = fref_div * vd;
+		f_diff = f_pll - f;
+		if (f_diff < 0)
+			f_diff = -f_diff;
+
+		if ((unsigned)f_diff < best) {
+			vco.v = vd - 8;
+			vco.r = rd - 2;
+			if (f_diff == 0)
+				break;
+			best = f_diff;
+		}
+	}
+
+	return vco;
+}
+
+EXPORT_SYMBOL(icst_hz_to_vco);
diff --git a/drivers/clk/versatile/icst.h b/drivers/clk/versatile/icst.h
new file mode 100644
index 000000000..7519bba03
--- /dev/null
+++ b/drivers/clk/versatile/icst.h
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Support functions for calculating clocks/divisors for the ICST
+ *  clock generators.  See http://www.idt.com/ for more information
+ *  on these devices.
+ */
+#ifndef ICST_H
+#define ICST_H
+
+struct icst_params {
+	unsigned long	ref;
+	unsigned long	vco_max;	/* inclusive */
+	unsigned long	vco_min;	/* exclusive */
+	unsigned short	vd_min;		/* inclusive */
+	unsigned short	vd_max;		/* inclusive */
+	unsigned char	rd_min;		/* inclusive */
+	unsigned char	rd_max;		/* inclusive */
+	const unsigned char *s2div;	/* chip specific s2div array */
+	const unsigned char *idx2s;	/* chip specific idx2s array */
+};
+
+struct icst_vco {
+	unsigned short	v;
+	unsigned char	r;
+	unsigned char	s;
+};
+
+unsigned long icst_hz(const struct icst_params *p, struct icst_vco vco);
+struct icst_vco icst_hz_to_vco(const struct icst_params *p, unsigned long freq);
+
+/*
+ * ICST307 VCO frequency must be between 6MHz and 200MHz (3.3 or 5V).
+ * This frequency is pre-output divider.
+ */
+#define ICST307_VCO_MIN	6000000
+#define ICST307_VCO_MAX	200000000
+
+extern const unsigned char icst307_s2div[];
+extern const unsigned char icst307_idx2s[];
+
+/*
+ * ICST525 VCO frequency must be between 10MHz and 200MHz (3V) or 320MHz (5V).
+ * This frequency is pre-output divider.
+ */
+#define ICST525_VCO_MIN		10000000
+#define ICST525_VCO_MAX_3V	200000000
+#define ICST525_VCO_MAX_5V	320000000
+
+extern const unsigned char icst525_s2div[];
+extern const unsigned char icst525_idx2s[];
+
+#endif