clk-icst.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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
 *
 * 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 …

#define VERSATILE_AUX_OSC_BITS …
#define INTEGRATOR_AP_CM_BITS …
#define INTEGRATOR_AP_SYS_BITS …
#define INTEGRATOR_CP_CM_CORE_BITS …
#define INTEGRATOR_CP_CM_MEM_BITS …

#define INTEGRATOR_AP_PCI_25_33_MHZ …

/**
 * struct clk_icst - ICST VCO clock wrapper
 * @hw: corresponding clock hardware entry
 * @map: register map
 * @vcoreg_off: VCO register address
 * @lockreg_off: 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 { … };

#define to_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)
{ … }

/**
 * 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)
{ … }

static unsigned long icst_recalc_rate(struct clk_hw *hw,
				      unsigned long parent_rate)
{ … }

static long icst_round_rate(struct clk_hw *hw, unsigned long rate,
			    unsigned long *prate)
{ … }

static int icst_set_rate(struct clk_hw *hw, unsigned long rate,
			 unsigned long parent_rate)
{ … }

static const struct clk_ops icst_ops = …;

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)
{ … }
EXPORT_SYMBOL_GPL(…);

struct clk *icst_clk_register(struct device *dev,
			const struct clk_icst_desc *desc,
			const char *name,
			const char *parent_name,
			void __iomem *base)
{ … }
EXPORT_SYMBOL_GPL(…);

#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 = …;

static const struct icst_params icst307_params = …;

/*
 * The core modules on the Integrator/AP and Integrator/CP have
 * especially crippled ICST525 control.
 */
static const struct icst_params icst525_apcp_cm_params = …;

static const struct icst_params icst525_ap_sys_params = …;

static const struct icst_params icst525_ap_pci_params = …;

static void __init of_syscon_icst_setup(struct device_node *np)
{ … }

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
linux/drivers/clk/versatile/clk-icst.c
