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Commit a6dba20c authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] pxa: introduce clk support for PXA SoC clocks 



Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 00dc4f94

arch/arm/mach-pxa/clock.c

+50 −29
Original line number Diff line number Diff line
@@ -9,19 +9,15 @@ 
#include <linux/string.h>

#include <linux/clk.h>

#include <linux/spinlock.h>

#include <linux/platform_device.h>

#include <linux/delay.h>



#include <asm/arch/pxa-regs.h>

#include <asm/hardware.h>



struct clk {

	struct list_head	node;

	unsigned long		rate;

	struct module		*owner;

	const char		*name;

	unsigned int		enabled;

	void			(*enable)(void);

	void			(*disable)(void);

};

#include "devices.h"

#include "generic.h"

#include "clock.h"



static LIST_HEAD(clocks);

static DEFINE_MUTEX(clocks_mutex);
@@ -33,7 +29,8 @@ struct clk *clk_get(struct device *dev, const char *id) 


	mutex_lock(&clocks_mutex);

	list_for_each_entry(p, &clocks, node) {

		if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {

		if (strcmp(id, p->name) == 0 &&

		    (p->dev == NULL || p->dev == dev)) {

			clk = p;

			break;

		}
@@ -46,7 +43,6 @@ EXPORT_SYMBOL(clk_get); 


void clk_put(struct clk *clk)

{

	module_put(clk->owner);

}

EXPORT_SYMBOL(clk_put);
@@ -56,8 +52,12 @@ int clk_enable(struct clk *clk) 


	spin_lock_irqsave(&clocks_lock, flags);

	if (clk->enabled++ == 0)

		clk->enable();

		clk->ops->enable(clk);

	spin_unlock_irqrestore(&clocks_lock, flags);



	if (clk->delay)

		udelay(clk->delay);



	return 0;

}

EXPORT_SYMBOL(clk_enable);
@@ -70,54 +70,75 @@ void clk_disable(struct clk *clk) 


	spin_lock_irqsave(&clocks_lock, flags);

	if (--clk->enabled == 0)

		clk->disable();

		clk->ops->disable(clk);

	spin_unlock_irqrestore(&clocks_lock, flags);

}

EXPORT_SYMBOL(clk_disable);



unsigned long clk_get_rate(struct clk *clk)

{

	return clk->rate;

	unsigned long rate;



	rate = clk->rate;

	if (clk->ops->getrate)

		rate = clk->ops->getrate(clk);



	return rate;

}

EXPORT_SYMBOL(clk_get_rate);





static void clk_gpio27_enable(void)

static void clk_gpio27_enable(struct clk *clk)

{

	pxa_gpio_mode(GPIO11_3_6MHz_MD);

}



static void clk_gpio27_disable(void)

static void clk_gpio27_disable(struct clk *clk)

{

}



static struct clk clk_gpio27 = {

	.name		= "GPIO27_CLK",

	.rate		= 3686400,

static const struct clkops clk_gpio27_ops = {

	.enable		= clk_gpio27_enable,

	.disable	= clk_gpio27_disable,

};



int clk_register(struct clk *clk)



void clk_cken_enable(struct clk *clk)

{

	mutex_lock(&clocks_mutex);

	list_add(&clk->node, &clocks);

	mutex_unlock(&clocks_mutex);

	return 0;

	CKEN |= 1 << clk->cken;

}



void clk_cken_disable(struct clk *clk)

{

	CKEN &= ~(1 << clk->cken);

}

EXPORT_SYMBOL(clk_register);



void clk_unregister(struct clk *clk)

const struct clkops clk_cken_ops = {

	.enable		= clk_cken_enable,

	.disable	= clk_cken_disable,

};



static struct clk common_clks[] = {

	{

		.name		= "GPIO27_CLK",

		.ops		= &clk_gpio27_ops,

		.rate		= 3686400,

	},

};



void clks_register(struct clk *clks, size_t num)

{

	int i;



	mutex_lock(&clocks_mutex);

	list_del(&clk->node);

	for (i = 0; i < num; i++)

		list_add(&clks[i].node, &clocks);

	mutex_unlock(&clocks_mutex);

}

EXPORT_SYMBOL(clk_unregister);



static int __init clk_init(void)

{

	clk_register(&clk_gpio27);

	clks_register(common_clks, ARRAY_SIZE(common_clks));

	return 0;

}

arch_initcall(clk_init);

arch/arm/mach-pxa/clock.h

0 → 100644
+43 −0
Original line number Diff line number Diff line 
struct clk;



struct clkops {

	void			(*enable)(struct clk *);

	void			(*disable)(struct clk *);

	unsigned long		(*getrate)(struct clk *);

};



struct clk {

	struct list_head	node;

	const char		*name;

	struct device		*dev;

	const struct clkops	*ops;

	unsigned long		rate;

	unsigned int		cken;

	unsigned int		delay;

	unsigned int		enabled;

};



#define INIT_CKEN(_name, _cken, _rate, _delay, _dev)	\

	{						\

		.name	= _name,			\

		.dev	= _dev,				\

		.ops	= &clk_cken_ops,		\

		.rate	= _rate,			\

		.cken	= CKEN_##_cken,			\

		.delay	= _delay,			\

	}



#define INIT_CK(_name, _cken, _ops, _dev)		\

	{						\

		.name	= _name,			\

		.dev	= _dev,				\

		.ops	= _ops,				\

		.cken	= CKEN_##_cken,			\

	}



extern const struct clkops clk_cken_ops;



void clk_cken_enable(struct clk *clk);

void clk_cken_disable(struct clk *clk);



void clks_register(struct clk *clks, size_t num);

arch/arm/mach-pxa/pxa25x.c

+38 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 


#include "generic.h"

#include "devices.h"

#include "clock.h"



/*

 * Various clock factors driven by the CCCR register.
@@ -94,6 +95,41 @@ unsigned int pxa25x_get_memclk_frequency_10khz(void) 
	return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;

}



static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)

{

	return pxa25x_get_memclk_frequency_10khz() * 10000;

}



static const struct clkops clk_pxa25x_lcd_ops = {

	.enable		= clk_cken_enable,

	.disable	= clk_cken_disable,

	.getrate	= clk_pxa25x_lcd_getrate,

};



/*

 * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)

 * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz

 * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)

 */

static struct clk pxa25x_clks[] = {

	INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),

	INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),

	INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),

	INIT_CKEN("UARTCLK", STUART, 14745600, 1, &pxa_device_stuart.dev),

	INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),

	INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa_device_udc.dev),

	INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),

	INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),

	/*

	INIT_CKEN("PWMCLK",  PWM0, 3686400,  0, NULL),

	INIT_CKEN("PWMCLK",  PWM0, 3686400,  0, NULL),

	INIT_CKEN("SSPCLK",  SSP,  3686400,  0, NULL),

	INIT_CKEN("I2SCLK",  I2S,  14745600, 0, NULL),

	INIT_CKEN("NSSPCLK", NSSP, 3686400,  0, NULL),

	INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),

	*/

};



#ifdef CONFIG_PM



#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
@@ -215,6 +251,8 @@ static int __init pxa25x_init(void) 
	int ret = 0;



	if (cpu_is_pxa21x() || cpu_is_pxa25x()) {

		clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));



		if ((ret = pxa_init_dma(16)))

			return ret;

#ifdef CONFIG_PM

arch/arm/mach-pxa/pxa27x.c

+45 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 


#include "generic.h"

#include "devices.h"

#include "clock.h"



/* Crystal clock: 13MHz */

#define BASE_CLK	13000000
@@ -120,6 +121,48 @@ unsigned int pxa27x_get_lcdclk_frequency_10khz(void) 
	return (K / 10000);

}



static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)

{

	return pxa27x_get_lcdclk_frequency_10khz() * 10000;

}



static const struct clkops clk_pxa27x_lcd_ops = {

	.enable		= clk_cken_enable,

	.disable	= clk_cken_disable,

	.getrate	= clk_pxa27x_lcd_getrate,

};



static struct clk pxa27x_clks[] = {

	INIT_CK("LCDCLK", LCD,    &clk_pxa27x_lcd_ops, &pxa_device_fb.dev),

	INIT_CK("CAMCLK", CAMERA, &clk_pxa27x_lcd_ops, NULL),



	INIT_CKEN("UARTCLK", STUART, 14857000, 1, &pxa_device_stuart.dev),

	INIT_CKEN("UARTCLK", FFUART, 14857000, 1, &pxa_device_ffuart.dev),

	INIT_CKEN("UARTCLK", BTUART, 14857000, 1, &pxa_device_btuart.dev),



	INIT_CKEN("I2SCLK",  I2S,  14682000, 0, &pxa_device_i2s.dev),

	INIT_CKEN("I2CCLK",  I2C,  32842000, 0, &pxa_device_i2c.dev),

	INIT_CKEN("UDCCLK",  USB,  48000000, 5, &pxa_device_udc.dev),

	INIT_CKEN("MMCCLK",  MMC,  19500000, 0, &pxa_device_mci.dev),

	INIT_CKEN("FICPCLK", FICP, 48000000, 0, &pxa_device_ficp.dev),



	INIT_CKEN("USBCLK", USB,    48000000, 0, &pxa27x_device_ohci.dev),

	INIT_CKEN("I2CCLK", PWRI2C, 13000000, 0, &pxa27x_device_i2c_power.dev),

	INIT_CKEN("KBDCLK", KEYPAD, 32768, 0, NULL),



	/*

	INIT_CKEN("PWMCLK",  PWM0, 13000000, 0, NULL),

	INIT_CKEN("SSPCLK",  SSP1, 13000000, 0, NULL),

	INIT_CKEN("SSPCLK",  SSP2, 13000000, 0, NULL),

	INIT_CKEN("SSPCLK",  SSP3, 13000000, 0, NULL),

	INIT_CKEN("MSLCLK",  MSL,  48000000, 0, NULL),

	INIT_CKEN("USIMCLK", USIM, 48000000, 0, NULL),

	INIT_CKEN("MSTKCLK", MEMSTK, 19500000, 0, NULL),

	INIT_CKEN("IMCLK",   IM,   0, 0, NULL),

	INIT_CKEN("MEMCLK",  MEMC, 0, 0, NULL),

	*/

};



#ifdef CONFIG_PM



#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
@@ -343,6 +386,8 @@ static int __init pxa27x_init(void) 
{

	int ret = 0;

	if (cpu_is_pxa27x()) {

		clks_register(pxa27x_clks, ARRAY_SIZE(pxa27x_clks));



		if ((ret = pxa_init_dma(32)))

			return ret;

#ifdef CONFIG_PM