drivers/clk/at91/pmc.c - linux - Git at Google

 /*
  *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  */

 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
 #include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/syscore_ops.h>

 #include <asm/proc-fns.h>

 #include <dt-bindings/clock/at91.h>

 #include "pmc.h"

 #define PMC_MAX_IDS 128
 #define PMC_MAX_PCKS 8

 int of_at91_get_clk_range(struct device_node *np, const char *propname,
 			  struct clk_range *range)
 {
 	u32 min, max;
 	int ret;

 	ret = of_property_read_u32_index(np, propname, 0, &min);
 	if (ret)
 		return ret;

 	ret = of_property_read_u32_index(np, propname, 1, &max);
 	if (ret)
 		return ret;

 	if (range) {
 		range->min = min;
 		range->max = max;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);

 struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data)
 {
 	unsigned int type = clkspec->args[0];
 	unsigned int idx = clkspec->args[1];
 	struct pmc_data *pmc_data = data;

 	switch (type) {
 	case PMC_TYPE_CORE:
 		if (idx < pmc_data->ncore)
 			return pmc_data->chws[idx];
 		break;
 	case PMC_TYPE_SYSTEM:
 		if (idx < pmc_data->nsystem)
 			return pmc_data->shws[idx];
 		break;
 	case PMC_TYPE_PERIPHERAL:
 		if (idx < pmc_data->nperiph)
 			return pmc_data->phws[idx];
 		break;
 	case PMC_TYPE_GCK:
 		if (idx < pmc_data->ngck)
 			return pmc_data->ghws[idx];
 		break;
 	default:
 		break;
 	}

 	pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);

 	return ERR_PTR(-EINVAL);
 }

 void pmc_data_free(struct pmc_data *pmc_data)
 {
 	kfree(pmc_data->chws);
 	kfree(pmc_data->shws);
 	kfree(pmc_data->phws);
 	kfree(pmc_data->ghws);
 }

 struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
 				   unsigned int nperiph, unsigned int ngck)
 {
 	struct pmc_data *pmc_data = kzalloc(sizeof(*pmc_data), GFP_KERNEL);

 	if (!pmc_data)
 		return NULL;

 	pmc_data->ncore = ncore;
 	pmc_data->chws = kcalloc(ncore, sizeof(struct clk_hw *), GFP_KERNEL);
 	if (!pmc_data->chws)
 		goto err;

 	pmc_data->nsystem = nsystem;
 	pmc_data->shws = kcalloc(nsystem, sizeof(struct clk_hw *), GFP_KERNEL);
 	if (!pmc_data->shws)
 		goto err;

 	pmc_data->nperiph = nperiph;
 	pmc_data->phws = kcalloc(nperiph, sizeof(struct clk_hw *), GFP_KERNEL);
 	if (!pmc_data->phws)
 		goto err;

 	pmc_data->ngck = ngck;
 	pmc_data->ghws = kcalloc(ngck, sizeof(struct clk_hw *), GFP_KERNEL);
 	if (!pmc_data->ghws)
 		goto err;

 	return pmc_data;

 err:
 	pmc_data_free(pmc_data);

 	return NULL;
 }

 #ifdef CONFIG_PM
 static struct regmap *pmcreg;

 static u8 registered_ids[PMC_MAX_IDS];
 static u8 registered_pcks[PMC_MAX_PCKS];

 static struct
 {
 	u32 scsr;
 	u32 pcsr0;
 	u32 uckr;
 	u32 mor;
 	u32 mcfr;
 	u32 pllar;
 	u32 mckr;
 	u32 usb;
 	u32 imr;
 	u32 pcsr1;
 	u32 pcr[PMC_MAX_IDS];
 	u32 audio_pll0;
 	u32 audio_pll1;
 	u32 pckr[PMC_MAX_PCKS];
 } pmc_cache;

 /*
  * As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored
  * without alteration in the table, and 0 is for unused clocks.
  */
 void pmc_register_id(u8 id)
 {
 	int i;

 	for (i = 0; i < PMC_MAX_IDS; i++) {
 		if (registered_ids[i] == 0) {
 			registered_ids[i] = id;
 			break;
 		}
 		if (registered_ids[i] == id)
 			break;
 	}
 }

 /*
  * As Programmable Clock 0 is valid on AT91 chips, there is an offset
  * of 1 between the stored value and the real clock ID.
  */
 void pmc_register_pck(u8 pck)
 {
 	int i;

 	for (i = 0; i < PMC_MAX_PCKS; i++) {
 		if (registered_pcks[i] == 0) {
 			registered_pcks[i] = pck + 1;
 			break;
 		}
 		if (registered_pcks[i] == (pck + 1))
 			break;
 	}
 }

 static int pmc_suspend(void)
 {
 	int i;
 	u8 num;

 	regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
 	regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
 	regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
 	regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
 	regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr);
 	regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar);
 	regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr);
 	regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb);
 	regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr);
 	regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1);

 	for (i = 0; registered_ids[i]; i++) {
 		regmap_write(pmcreg, AT91_PMC_PCR,
 			     (registered_ids[i] & AT91_PMC_PCR_PID_MASK));
 		regmap_read(pmcreg, AT91_PMC_PCR,
 			    &pmc_cache.pcr[registered_ids[i]]);
 	}
 	for (i = 0; registered_pcks[i]; i++) {
 		num = registered_pcks[i] - 1;
 		regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]);
 	}

 	return 0;
 }

 static bool pmc_ready(unsigned int mask)
 {
 	unsigned int status;

 	regmap_read(pmcreg, AT91_PMC_SR, &status);

 	return ((status & mask) == mask) ? 1 : 0;
 }

 static void pmc_resume(void)
 {
 	int i;
 	u8 num;
 	u32 tmp;
 	u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA;

 	regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
 	if (pmc_cache.mckr != tmp)
 		pr_warn("MCKR was not configured properly by the firmware\n");
 	regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp);
 	if (pmc_cache.pllar != tmp)
 		pr_warn("PLLAR was not configured properly by the firmware\n");

 	regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
 	regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
 	regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
 	regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
 	regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr);
 	regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb);
 	regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr);
 	regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1);

 	for (i = 0; registered_ids[i]; i++) {
 		regmap_write(pmcreg, AT91_PMC_PCR,
 			     pmc_cache.pcr[registered_ids[i]] |
 			     AT91_PMC_PCR_CMD);
 	}
 	for (i = 0; registered_pcks[i]; i++) {
 		num = registered_pcks[i] - 1;
 		regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]);
 	}

 	if (pmc_cache.uckr & AT91_PMC_UPLLEN)
 		mask |= AT91_PMC_LOCKU;

 	while (!pmc_ready(mask))
 		cpu_relax();
 }

 static struct syscore_ops pmc_syscore_ops = {
 	.suspend = pmc_suspend,
 	.resume = pmc_resume,
 };

 static const struct of_device_id sama5d2_pmc_dt_ids[] = {
 	{ .compatible = "atmel,sama5d2-pmc" },
 	{ /* sentinel */ }
 };

 static int __init pmc_register_ops(void)
 {
 	struct device_node *np;

 	np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids);

 	pmcreg = syscon_node_to_regmap(np);
 	if (IS_ERR(pmcreg))
 		return PTR_ERR(pmcreg);

 	register_syscore_ops(&pmc_syscore_ops);

 	return 0;
 }
 /* This has to happen before arch_initcall because of the tcb_clksrc driver */
 postcore_initcall(pmc_register_ops);
 #endif
	/*
	* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	*/

	#include <linux/clk-provider.h>
	#include <linux/clkdev.h>
	#include <linux/clk/at91_pmc.h>
	#include <linux/of.h>
	#include <linux/mfd/syscon.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/syscore_ops.h>

	#include <asm/proc-fns.h>

	#include <dt-bindings/clock/at91.h>

	#include "pmc.h"

	#define PMC_MAX_IDS 128
	#define PMC_MAX_PCKS 8

	int of_at91_get_clk_range(struct device_node np, const char propname,
	struct clk_range *range)
	{
	u32 min, max;
	int ret;

	ret = of_property_read_u32_index(np, propname, 0, &min);
	if (ret)
	return ret;

	ret = of_property_read_u32_index(np, propname, 1, &max);
	if (ret)
	return ret;

	if (range) {
	range->min = min;
	range->max = max;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(of_at91_get_clk_range);

	struct clk_hw of_clk_hw_pmc_get(struct of_phandle_args clkspec, void *data)
	{
	unsigned int type = clkspec->args[0];
	unsigned int idx = clkspec->args[1];
	struct pmc_data *pmc_data = data;

	switch (type) {
	case PMC_TYPE_CORE:
	if (idx < pmc_data->ncore)
	return pmc_data->chws[idx];
	break;
	case PMC_TYPE_SYSTEM:
	if (idx < pmc_data->nsystem)
	return pmc_data->shws[idx];
	break;
	case PMC_TYPE_PERIPHERAL:
	if (idx < pmc_data->nperiph)
	return pmc_data->phws[idx];
	break;
	case PMC_TYPE_GCK:
	if (idx < pmc_data->ngck)
	return pmc_data->ghws[idx];
	break;
	default:
	break;
	}

	pr_err("%s: invalid type (%u) or index (%u)\n", __func__, type, idx);

	return ERR_PTR(-EINVAL);
	}

	void pmc_data_free(struct pmc_data *pmc_data)
	{
	kfree(pmc_data->chws);
	kfree(pmc_data->shws);
	kfree(pmc_data->phws);
	kfree(pmc_data->ghws);
	}

	struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
	unsigned int nperiph, unsigned int ngck)
	{
	struct pmc_data pmc_data = kzalloc(sizeof(pmc_data), GFP_KERNEL);

	if (!pmc_data)
	return NULL;

	pmc_data->ncore = ncore;
	pmc_data->chws = kcalloc(ncore, sizeof(struct clk_hw *), GFP_KERNEL);
	if (!pmc_data->chws)
	goto err;

	pmc_data->nsystem = nsystem;
	pmc_data->shws = kcalloc(nsystem, sizeof(struct clk_hw *), GFP_KERNEL);
	if (!pmc_data->shws)
	goto err;

	pmc_data->nperiph = nperiph;
	pmc_data->phws = kcalloc(nperiph, sizeof(struct clk_hw *), GFP_KERNEL);
	if (!pmc_data->phws)
	goto err;

	pmc_data->ngck = ngck;
	pmc_data->ghws = kcalloc(ngck, sizeof(struct clk_hw *), GFP_KERNEL);
	if (!pmc_data->ghws)
	goto err;

	return pmc_data;

	err:
	pmc_data_free(pmc_data);

	return NULL;
	}

	#ifdef CONFIG_PM
	static struct regmap *pmcreg;

	static u8 registered_ids[PMC_MAX_IDS];
	static u8 registered_pcks[PMC_MAX_PCKS];

	static struct
	{
	u32 scsr;
	u32 pcsr0;
	u32 uckr;
	u32 mor;
	u32 mcfr;
	u32 pllar;
	u32 mckr;
	u32 usb;
	u32 imr;
	u32 pcsr1;
	u32 pcr[PMC_MAX_IDS];
	u32 audio_pll0;
	u32 audio_pll1;
	u32 pckr[PMC_MAX_PCKS];
	} pmc_cache;

	/*
	* As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored
	* without alteration in the table, and 0 is for unused clocks.
	*/
	void pmc_register_id(u8 id)
	{
	int i;

	for (i = 0; i < PMC_MAX_IDS; i++) {
	if (registered_ids[i] == 0) {
	registered_ids[i] = id;
	break;
	}
	if (registered_ids[i] == id)
	break;
	}
	}

	/*
	* As Programmable Clock 0 is valid on AT91 chips, there is an offset
	* of 1 between the stored value and the real clock ID.
	*/
	void pmc_register_pck(u8 pck)
	{
	int i;

	for (i = 0; i < PMC_MAX_PCKS; i++) {
	if (registered_pcks[i] == 0) {
	registered_pcks[i] = pck + 1;
	break;
	}
	if (registered_pcks[i] == (pck + 1))
	break;
	}
	}

	static int pmc_suspend(void)
	{
	int i;
	u8 num;

	regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr);
	regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0);
	regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr);
	regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor);
	regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr);
	regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar);
	regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr);
	regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb);
	regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr);
	regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1);

	for (i = 0; registered_ids[i]; i++) {
	regmap_write(pmcreg, AT91_PMC_PCR,
	(registered_ids[i] & AT91_PMC_PCR_PID_MASK));
	regmap_read(pmcreg, AT91_PMC_PCR,
	&pmc_cache.pcr[registered_ids[i]]);
	}
	for (i = 0; registered_pcks[i]; i++) {
	num = registered_pcks[i] - 1;
	regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]);
	}

	return 0;
	}

	static bool pmc_ready(unsigned int mask)
	{
	unsigned int status;

	regmap_read(pmcreg, AT91_PMC_SR, &status);

	return ((status & mask) == mask) ? 1 : 0;
	}

	static void pmc_resume(void)
	{
	int i;
	u8 num;
	u32 tmp;
	u32 mask = AT91_PMC_MCKRDY \| AT91_PMC_LOCKA;

	regmap_read(pmcreg, AT91_PMC_MCKR, &tmp);
	if (pmc_cache.mckr != tmp)
	pr_warn("MCKR was not configured properly by the firmware\n");
	regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp);
	if (pmc_cache.pllar != tmp)
	pr_warn("PLLAR was not configured properly by the firmware\n");

	regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr);
	regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0);
	regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr);
	regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor);
	regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr);
	regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb);
	regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr);
	regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1);

	for (i = 0; registered_ids[i]; i++) {
	regmap_write(pmcreg, AT91_PMC_PCR,
	pmc_cache.pcr[registered_ids[i]] \|
	AT91_PMC_PCR_CMD);
	}
	for (i = 0; registered_pcks[i]; i++) {
	num = registered_pcks[i] - 1;
	regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]);
	}

	if (pmc_cache.uckr & AT91_PMC_UPLLEN)
	mask \|= AT91_PMC_LOCKU;

	while (!pmc_ready(mask))
	cpu_relax();
	}

	static struct syscore_ops pmc_syscore_ops = {
	.suspend = pmc_suspend,
	.resume = pmc_resume,
	};

	static const struct of_device_id sama5d2_pmc_dt_ids[] = {
	{ .compatible = "atmel,sama5d2-pmc" },
	{ /* sentinel */ }
	};

	static int __init pmc_register_ops(void)
	{
	struct device_node *np;

	np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids);

	pmcreg = syscon_node_to_regmap(np);
	if (IS_ERR(pmcreg))
	return PTR_ERR(pmcreg);

	register_syscore_ops(&pmc_syscore_ops);

	return 0;
	}
	/* This has to happen before arch_initcall because of the tcb_clksrc driver */
	postcore_initcall(pmc_register_ops);
	#endif