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Commit f090fb37 authored by Boris Brezillon's avatar Boris Brezillon Committed by Nicolas Ferre
Browse files

clk: at91: add PMC utmi clock 



This adds new at91 utmi clock implementation using common clk framework.

This clock is a pll with a fixed factor (x40).
It is used as a source for usb clock.

Signed-off-by: default avatarBoris BREZILLON <b.brezillon@overkiz.com>
Acked-by: default avatarMike Turquette <mturquette@linaro.org>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent 1f22f8bb

arch/arm/mach-at91/Kconfig

+7 −0
Original line number Diff line number Diff line 
if ARCH_AT91



config HAVE_AT91_UTMI

	bool



config HAVE_AT91_DBGU0

	bool
@@ -78,6 +81,7 @@ config SOC_SAMA5D3 
	select HAVE_FB_ATMEL

	select HAVE_AT91_DBGU1

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI

	help

	  Select this if you are using one of Atmel's SAMA5D3 family SoC.

	  This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
@@ -124,6 +128,7 @@ config SOC_AT91SAM9RL 
	select HAVE_FB_ATMEL

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI



config SOC_AT91SAM9G45

	bool "AT91SAM9G45 or AT91SAM9M10 families"
@@ -131,6 +136,7 @@ config SOC_AT91SAM9G45 
	select HAVE_FB_ATMEL

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI

	help

	  Select this if you are using one of Atmel's AT91SAM9G45 family SoC.

	  This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11.
@@ -141,6 +147,7 @@ config SOC_AT91SAM9X5 
	select HAVE_FB_ATMEL

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI

	help

	  Select this if you are using one of Atmel's AT91SAM9x5 family SoC.

	  This means that your SAM9 name finishes with a '5' (except if it is

drivers/clk/at91/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,3 +7,4 @@ obj-y += clk-main.o clk-pll.o clk-plldiv.o clk-master.o 
obj-y += clk-system.o clk-peripheral.o



obj-$(CONFIG_AT91_PROGRAMMABLE_CLOCKS)	+= clk-programmable.o

obj-$(CONFIG_HAVE_AT91_UTMI)		+= clk-utmi.o

drivers/clk/at91/clk-utmi.c

0 → 100644
+159 −0
Original line number Diff line number Diff line 
/*

 *  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/interrupt.h>

#include <linux/irq.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/io.h>

#include <linux/sched.h>

#include <linux/wait.h>



#include "pmc.h"



#define UTMI_FIXED_MUL		40



struct clk_utmi {

	struct clk_hw hw;

	struct at91_pmc *pmc;

	unsigned int irq;

	wait_queue_head_t wait;

};



#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)



static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)

{

	struct clk_utmi *utmi = (struct clk_utmi *)dev_id;



	wake_up(&utmi->wait);

	disable_irq_nosync(utmi->irq);



	return IRQ_HANDLED;

}



static int clk_utmi_prepare(struct clk_hw *hw)

{

	struct clk_utmi *utmi = to_clk_utmi(hw);

	struct at91_pmc *pmc = utmi->pmc;

	u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) | AT91_PMC_UPLLEN |

		  AT91_PMC_UPLLCOUNT | AT91_PMC_BIASEN;



	pmc_write(pmc, AT91_CKGR_UCKR, tmp);



	while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU)) {

		enable_irq(utmi->irq);

		wait_event(utmi->wait,

			   pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);

	}



	return 0;

}



static int clk_utmi_is_prepared(struct clk_hw *hw)

{

	struct clk_utmi *utmi = to_clk_utmi(hw);

	struct at91_pmc *pmc = utmi->pmc;



	return !!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);

}



static void clk_utmi_unprepare(struct clk_hw *hw)

{

	struct clk_utmi *utmi = to_clk_utmi(hw);

	struct at91_pmc *pmc = utmi->pmc;

	u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) & ~AT91_PMC_UPLLEN;



	pmc_write(pmc, AT91_CKGR_UCKR, tmp);

}



static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,

					  unsigned long parent_rate)

{

	/* UTMI clk is a fixed clk multiplier */

	return parent_rate * UTMI_FIXED_MUL;

}



static const struct clk_ops utmi_ops = {

	.prepare = clk_utmi_prepare,

	.unprepare = clk_utmi_unprepare,

	.is_prepared = clk_utmi_is_prepared,

	.recalc_rate = clk_utmi_recalc_rate,

};



static struct clk * __init

at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,

		       const char *name, const char *parent_name)

{

	int ret;

	struct clk_utmi *utmi;

	struct clk *clk = NULL;

	struct clk_init_data init;



	utmi = kzalloc(sizeof(*utmi), GFP_KERNEL);

	if (!utmi)

		return ERR_PTR(-ENOMEM);



	init.name = name;

	init.ops = &utmi_ops;

	init.parent_names = parent_name ? &parent_name : NULL;

	init.num_parents = parent_name ? 1 : 0;

	init.flags = CLK_SET_RATE_GATE;



	utmi->hw.init = &init;

	utmi->pmc = pmc;

	utmi->irq = irq;

	init_waitqueue_head(&utmi->wait);

	irq_set_status_flags(utmi->irq, IRQ_NOAUTOEN);

	ret = request_irq(utmi->irq, clk_utmi_irq_handler,

			  IRQF_TRIGGER_HIGH, "clk-utmi", utmi);

	if (ret)

		return ERR_PTR(ret);



	clk = clk_register(NULL, &utmi->hw);

	if (IS_ERR(clk))

		kfree(utmi);



	return clk;

}



static void __init

of_at91_clk_utmi_setup(struct device_node *np, struct at91_pmc *pmc)

{

	unsigned int irq;

	struct clk *clk;

	const char *parent_name;

	const char *name = np->name;



	parent_name = of_clk_get_parent_name(np, 0);



	of_property_read_string(np, "clock-output-names", &name);



	irq = irq_of_parse_and_map(np, 0);

	if (!irq)

		return;



	clk = at91_clk_register_utmi(pmc, irq, name, parent_name);

	if (IS_ERR(clk))

		return;



	of_clk_add_provider(np, of_clk_src_simple_get, clk);

	return;

}



void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,

					 struct at91_pmc *pmc)

{

	of_at91_clk_utmi_setup(np, pmc);

}

drivers/clk/at91/pmc.c

+7 −0
Original line number Diff line number Diff line
@@ -292,6 +292,13 @@ static const struct of_device_id pmc_clk_ids[] __initdata = { 
		.compatible = "atmel,at91sam9x5-clk-programmable",

		.data = of_at91sam9x5_clk_prog_setup,

	},

#endif

	/* UTMI clock */

#if defined(CONFIG_HAVE_AT91_UTMI)

	{

		.compatible = "atmel,at91sam9x5-clk-utmi",

		.data = of_at91sam9x5_clk_utmi_setup,

	},

#endif

	{ /*sentinel*/ }

};

drivers/clk/at91/pmc.h

+5 −0
Original line number Diff line number Diff line
@@ -94,4 +94,9 @@ extern void __init of_at91sam9x5_clk_prog_setup(struct device_node *np, 
						struct at91_pmc *pmc);

#endif



#if defined(CONFIG_HAVE_AT91_UTMI)

extern void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,

						struct at91_pmc *pmc);

#endif



#endif /* __PMC_H_ */