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Commit c84a61d8 authored by Boris Brezillon's avatar Boris Brezillon Committed by Nicolas Ferre
Browse files

clk: at91: add PMC usb clock 



This patch adds new at91 usb clock implementation using common clk framework.
This clock is used to clock usb ports (ohci, ehci and udc).

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 f090fb37

arch/arm/mach-at91/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -3,6 +3,9 @@ if ARCH_AT91 
config HAVE_AT91_UTMI

	bool



config HAVE_AT91_USB_CLK

	bool



config HAVE_AT91_DBGU0

	bool
@@ -82,6 +85,7 @@ config SOC_SAMA5D3 
	select HAVE_AT91_DBGU1

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI

	select HAVE_AT91_USB_CLK

	help

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

	  This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
@@ -96,12 +100,14 @@ config SOC_AT91RM9200 
	select MULTI_IRQ_HANDLER

	select SPARSE_IRQ

	select AT91_USE_OLD_CLK

	select HAVE_AT91_USB_CLK



config SOC_AT91SAM9260

	bool "AT91SAM9260, AT91SAM9XE or AT91SAM9G20"

	select HAVE_AT91_DBGU0

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_USB_CLK

	help

	  Select this if you are using one of Atmel's AT91SAM9260, AT91SAM9XE

	  or AT91SAM9G20 SoC.
@@ -112,6 +118,7 @@ config SOC_AT91SAM9261 
	select HAVE_FB_ATMEL

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_USB_CLK

	help

	  Select this if you are using one of Atmel's AT91SAM9261 or AT91SAM9G10 SoC.
@@ -121,6 +128,7 @@ config SOC_AT91SAM9263 
	select HAVE_FB_ATMEL

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_USB_CLK



config SOC_AT91SAM9RL

	bool "AT91SAM9RL"
@@ -137,6 +145,7 @@ config SOC_AT91SAM9G45 
	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI

	select HAVE_AT91_USB_CLK

	help

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

	  This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and AT91SAM9M11.
@@ -148,6 +157,7 @@ config SOC_AT91SAM9X5 
	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_UTMI

	select HAVE_AT91_USB_CLK

	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
@@ -161,6 +171,7 @@ config SOC_AT91SAM9N12 
	select HAVE_FB_ATMEL

	select SOC_AT91SAM9

	select AT91_USE_OLD_CLK

	select HAVE_AT91_USB_CLK

	help

	  Select this if you are using Atmel's AT91SAM9N12 SoC.

drivers/clk/at91/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,3 +8,4 @@ obj-y += clk-system.o clk-peripheral.o 


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

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

obj-$(CONFIG_HAVE_AT91_USB_CLK)		+= clk-usb.o

drivers/clk/at91/clk-usb.c

0 → 100644
+398 −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/of.h>

#include <linux/of_address.h>

#include <linux/io.h>



#include "pmc.h"



#define USB_SOURCE_MAX		2



#define SAM9X5_USB_DIV_SHIFT	8

#define SAM9X5_USB_MAX_DIV	0xf



#define RM9200_USB_DIV_SHIFT	28

#define RM9200_USB_DIV_TAB_SIZE	4



struct at91sam9x5_clk_usb {

	struct clk_hw hw;

	struct at91_pmc *pmc;

};



#define to_at91sam9x5_clk_usb(hw) \

	container_of(hw, struct at91sam9x5_clk_usb, hw)



struct at91rm9200_clk_usb {

	struct clk_hw hw;

	struct at91_pmc *pmc;

	u32 divisors[4];

};



#define to_at91rm9200_clk_usb(hw) \

	container_of(hw, struct at91rm9200_clk_usb, hw)



static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,

						    unsigned long parent_rate)

{

	u32 tmp;

	u8 usbdiv;

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;



	tmp = pmc_read(pmc, AT91_PMC_USB);

	usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;

	return parent_rate / (usbdiv + 1);

}



static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,

					  unsigned long *parent_rate)

{

	unsigned long div;

	unsigned long bestrate;

	unsigned long tmp;



	if (rate >= *parent_rate)

		return *parent_rate;



	div = *parent_rate / rate;

	if (div >= SAM9X5_USB_MAX_DIV)

		return *parent_rate / (SAM9X5_USB_MAX_DIV + 1);



	bestrate = *parent_rate / div;

	tmp = *parent_rate / (div + 1);

	if (bestrate - rate > rate - tmp)

		bestrate = tmp;



	return bestrate;

}



static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)

{

	u32 tmp;

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;



	if (index > 1)

		return -EINVAL;

	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;

	if (index)

		tmp |= AT91_PMC_USBS;

	pmc_write(pmc, AT91_PMC_USB, tmp);

	return 0;

}



static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)

{

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;



	return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;

}



static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,

				       unsigned long parent_rate)

{

	u32 tmp;

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;

	unsigned long div = parent_rate / rate;



	if (parent_rate % rate || div < 1 || div >= SAM9X5_USB_MAX_DIV)

		return -EINVAL;



	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;

	tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT;

	pmc_write(pmc, AT91_PMC_USB, tmp);



	return 0;

}



static const struct clk_ops at91sam9x5_usb_ops = {

	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,

	.round_rate = at91sam9x5_clk_usb_round_rate,

	.get_parent = at91sam9x5_clk_usb_get_parent,

	.set_parent = at91sam9x5_clk_usb_set_parent,

	.set_rate = at91sam9x5_clk_usb_set_rate,

};



static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)

{

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;



	pmc_write(pmc, AT91_PMC_USB,

		  pmc_read(pmc, AT91_PMC_USB) | AT91_PMC_USBS);

	return 0;

}



static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)

{

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;



	pmc_write(pmc, AT91_PMC_USB,

		  pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);

}



static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)

{

	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;



	return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS);

}



static const struct clk_ops at91sam9n12_usb_ops = {

	.enable = at91sam9n12_clk_usb_enable,

	.disable = at91sam9n12_clk_usb_disable,

	.is_enabled = at91sam9n12_clk_usb_is_enabled,

	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,

	.round_rate = at91sam9x5_clk_usb_round_rate,

	.set_rate = at91sam9x5_clk_usb_set_rate,

};



static struct clk * __init

at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,

			    const char **parent_names, u8 num_parents)

{

	struct at91sam9x5_clk_usb *usb;

	struct clk *clk = NULL;

	struct clk_init_data init;



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

	if (!usb)

		return ERR_PTR(-ENOMEM);



	init.name = name;

	init.ops = &at91sam9x5_usb_ops;

	init.parent_names = parent_names;

	init.num_parents = num_parents;

	init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;



	usb->hw.init = &init;

	usb->pmc = pmc;



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

	if (IS_ERR(clk))

		kfree(usb);



	return clk;

}



static struct clk * __init

at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name,

			     const char *parent_name)

{

	struct at91sam9x5_clk_usb *usb;

	struct clk *clk = NULL;

	struct clk_init_data init;



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

	if (!usb)

		return ERR_PTR(-ENOMEM);



	init.name = name;

	init.ops = &at91sam9n12_usb_ops;

	init.parent_names = &parent_name;

	init.num_parents = 1;

	init.flags = CLK_SET_RATE_GATE;



	usb->hw.init = &init;

	usb->pmc = pmc;



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

	if (IS_ERR(clk))

		kfree(usb);



	return clk;

}



static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,

						    unsigned long parent_rate)

{

	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;

	u32 tmp;

	u8 usbdiv;



	tmp = pmc_read(pmc, AT91_CKGR_PLLBR);

	usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;

	if (usb->divisors[usbdiv])

		return parent_rate / usb->divisors[usbdiv];



	return 0;

}



static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,

					  unsigned long *parent_rate)

{

	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);

	unsigned long bestrate = 0;

	int bestdiff = -1;

	unsigned long tmprate;

	int tmpdiff;

	int i = 0;



	for (i = 0; i < 4; i++) {

		if (!usb->divisors[i])

			continue;

		tmprate = *parent_rate / usb->divisors[i];

		if (tmprate < rate)

			tmpdiff = rate - tmprate;

		else

			tmpdiff = tmprate - rate;



		if (bestdiff < 0 || bestdiff > tmpdiff) {

			bestrate = tmprate;

			bestdiff = tmpdiff;

		}



		if (!bestdiff)

			break;

	}



	return bestrate;

}



static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,

				       unsigned long parent_rate)

{

	u32 tmp;

	int i;

	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);

	struct at91_pmc *pmc = usb->pmc;

	unsigned long div = parent_rate / rate;



	if (parent_rate % rate)

		return -EINVAL;

	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {

		if (usb->divisors[i] == div) {

			tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &

			      ~AT91_PMC_USBDIV;

			tmp |= i << RM9200_USB_DIV_SHIFT;

			pmc_write(pmc, AT91_CKGR_PLLBR, tmp);

			return 0;

		}

	}



	return -EINVAL;

}



static const struct clk_ops at91rm9200_usb_ops = {

	.recalc_rate = at91rm9200_clk_usb_recalc_rate,

	.round_rate = at91rm9200_clk_usb_round_rate,

	.set_rate = at91rm9200_clk_usb_set_rate,

};



static struct clk * __init

at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,

			    const char *parent_name, const u32 *divisors)

{

	struct at91rm9200_clk_usb *usb;

	struct clk *clk = NULL;

	struct clk_init_data init;



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

	if (!usb)

		return ERR_PTR(-ENOMEM);



	init.name = name;

	init.ops = &at91rm9200_usb_ops;

	init.parent_names = &parent_name;

	init.num_parents = 1;

	init.flags = 0;



	usb->hw.init = &init;

	usb->pmc = pmc;

	memcpy(usb->divisors, divisors, sizeof(usb->divisors));



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

	if (IS_ERR(clk))

		kfree(usb);



	return clk;

}



void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,

					struct at91_pmc *pmc)

{

	struct clk *clk;

	int i;

	int num_parents;

	const char *parent_names[USB_SOURCE_MAX];

	const char *name = np->name;



	num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");

	if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)

		return;



	for (i = 0; i < num_parents; i++) {

		parent_names[i] = of_clk_get_parent_name(np, i);

		if (!parent_names[i])

			return;

	}



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



	clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);

	if (IS_ERR(clk))

		return;



	of_clk_add_provider(np, of_clk_src_simple_get, clk);

}



void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,

					 struct at91_pmc *pmc)

{

	struct clk *clk;

	const char *parent_name;

	const char *name = np->name;



	parent_name = of_clk_get_parent_name(np, 0);

	if (!parent_name)

		return;



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



	clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);

	if (IS_ERR(clk))

		return;



	of_clk_add_provider(np, of_clk_src_simple_get, clk);

}



void __init of_at91rm9200_clk_usb_setup(struct device_node *np,

					struct at91_pmc *pmc)

{

	struct clk *clk;

	const char *parent_name;

	const char *name = np->name;

	u32 divisors[4] = {0, 0, 0, 0};



	parent_name = of_clk_get_parent_name(np, 0);

	if (!parent_name)

		return;



	of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);

	if (!divisors[0])

		return;



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



	clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);

	if (IS_ERR(clk))

		return;



	of_clk_add_provider(np, of_clk_src_simple_get, clk);

}

drivers/clk/at91/pmc.c

+15 −0
Original line number Diff line number Diff line
@@ -299,6 +299,21 @@ static const struct of_device_id pmc_clk_ids[] __initdata = { 
		.compatible = "atmel,at91sam9x5-clk-utmi",

		.data = of_at91sam9x5_clk_utmi_setup,

	},

#endif

	/* USB clock */

#if defined(CONFIG_HAVE_AT91_USB_CLK)

	{

		.compatible = "atmel,at91rm9200-clk-usb",

		.data = of_at91rm9200_clk_usb_setup,

	},

	{

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

		.data = of_at91sam9x5_clk_usb_setup,

	},

	{

		.compatible = "atmel,at91sam9n12-clk-usb",

		.data = of_at91sam9n12_clk_usb_setup,

	},

#endif

	{ /*sentinel*/ }

};

drivers/clk/at91/pmc.h

+9 −0
Original line number Diff line number Diff line
@@ -99,4 +99,13 @@ extern void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np, 
						struct at91_pmc *pmc);

#endif



#if defined(CONFIG_HAVE_AT91_USB_CLK)

extern void __init of_at91rm9200_clk_usb_setup(struct device_node *np,

					       struct at91_pmc *pmc);

extern void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,

					       struct at91_pmc *pmc);

extern void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,

						struct at91_pmc *pmc);

#endif



#endif /* __PMC_H_ */