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Commit ed67ea82 authored by Ryan Mallon's avatar Ryan Mallon Committed by Mark Brown
Browse files

EP93xx: Add i2s core support 



Add core support for EP93xx i2s audio

Signed-off-by: default avatarRyan Mallon <ryan@bluewatersys.com>
Acked-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent e40152ee

arch/arm/mach-ep93xx/clock.c

+66 −1
Original line number Diff line number Diff line
@@ -43,7 +43,8 @@ static unsigned long get_uart_rate(struct clk *clk); 


static int set_keytchclk_rate(struct clk *clk, unsigned long rate);

static int set_div_rate(struct clk *clk, unsigned long rate);



static int set_i2s_sclk_rate(struct clk *clk, unsigned long rate);

static int set_i2s_lrclk_rate(struct clk *clk, unsigned long rate);



static struct clk clk_xtali = {

	.rate		= EP93XX_EXT_CLK_RATE,
@@ -108,6 +109,29 @@ static struct clk clk_video = { 
	.set_rate	= set_div_rate,

};



static struct clk clk_i2s_mclk = {

	.sw_locked	= 1,

	.enable_reg	= EP93XX_SYSCON_I2SCLKDIV,

	.enable_mask	= EP93XX_SYSCON_CLKDIV_ENABLE,

	.set_rate	= set_div_rate,

};



static struct clk clk_i2s_sclk = {

	.sw_locked	= 1,

	.parent		= &clk_i2s_mclk,

	.enable_reg	= EP93XX_SYSCON_I2SCLKDIV,

	.enable_mask	= EP93XX_SYSCON_I2SCLKDIV_SENA,

	.set_rate	= set_i2s_sclk_rate,

};



static struct clk clk_i2s_lrclk = {

	.sw_locked	= 1,

	.parent		= &clk_i2s_sclk,

	.enable_reg	= EP93XX_SYSCON_I2SCLKDIV,

	.enable_mask	= EP93XX_SYSCON_I2SCLKDIV_SENA,

	.set_rate	= set_i2s_lrclk_rate,

};



/* DMA Clocks */

static struct clk clk_m2p0 = {

	.parent		= &clk_h,
@@ -186,6 +210,9 @@ static struct clk_lookup clocks[] = { 
	INIT_CK("ep93xx-ohci",		NULL,		&clk_usb_host),

	INIT_CK("ep93xx-keypad",	NULL,		&clk_keypad),

	INIT_CK("ep93xx-fb",		NULL,		&clk_video),

	INIT_CK("ep93xx-i2s",		"mclk",		&clk_i2s_mclk),

	INIT_CK("ep93xx-i2s",		"sclk",		&clk_i2s_sclk),

	INIT_CK("ep93xx-i2s",		"lrclk",	&clk_i2s_lrclk),

	INIT_CK(NULL,			"pwm_clk",	&clk_pwm),

	INIT_CK(NULL,			"m2p0",		&clk_m2p0),

	INIT_CK(NULL,			"m2p1",		&clk_m2p1),
@@ -396,6 +423,44 @@ static int set_div_rate(struct clk *clk, unsigned long rate) 
	return 0;

}



static int set_i2s_sclk_rate(struct clk *clk, unsigned long rate)

{

	unsigned val = __raw_readl(clk->enable_reg);



	if (rate == clk_i2s_mclk.rate / 2)

		ep93xx_syscon_swlocked_write(val & ~EP93XX_I2SCLKDIV_SDIV, 

					     clk->enable_reg);

	else if (rate == clk_i2s_mclk.rate / 4)

		ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_SDIV, 

					     clk->enable_reg);

	else

		return -EINVAL;



	clk_i2s_sclk.rate = rate;

	return 0;

}



static int set_i2s_lrclk_rate(struct clk *clk, unsigned long rate)

{

	unsigned val = __raw_readl(clk->enable_reg) & 

		~EP93XX_I2SCLKDIV_LRDIV_MASK;

	

	if (rate == clk_i2s_sclk.rate / 32)

		ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_LRDIV32,

					     clk->enable_reg);

	else if (rate == clk_i2s_sclk.rate / 64)

		ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_LRDIV64,

					     clk->enable_reg);

	else if (rate == clk_i2s_sclk.rate / 128)

		ep93xx_syscon_swlocked_write(val | EP93XX_I2SCLKDIV_LRDIV128,

					     clk->enable_reg);

	else

		return -EINVAL;



	clk_i2s_lrclk.rate = rate;

	return 0;

}



int clk_set_rate(struct clk *clk, unsigned long rate)

{

	if (clk->set_rate)

arch/arm/mach-ep93xx/core.c

+67 −0
Original line number Diff line number Diff line
@@ -617,6 +617,73 @@ void ep93xx_keypad_release_gpio(struct platform_device *pdev) 
}

EXPORT_SYMBOL(ep93xx_keypad_release_gpio);



/*************************************************************************

 * EP93xx I2S audio peripheral handling

 *************************************************************************/

static struct resource ep93xx_i2s_resource[] = {

	{

		.start	= EP93XX_I2S_PHYS_BASE,

		.end	= EP93XX_I2S_PHYS_BASE + 0x100 - 1,

		.flags	= IORESOURCE_MEM,

	},

};



static struct platform_device ep93xx_i2s_device = {

	.name		= "ep93xx-i2s",

	.id		= -1,

	.num_resources	= ARRAY_SIZE(ep93xx_i2s_resource),

	.resource	= ep93xx_i2s_resource,

};



void __init ep93xx_register_i2s(void)

{

	platform_device_register(&ep93xx_i2s_device);

}



#define EP93XX_SYSCON_DEVCFG_I2S_MASK	(EP93XX_SYSCON_DEVCFG_I2SONSSP | \

					 EP93XX_SYSCON_DEVCFG_I2SONAC97)



#define EP93XX_I2SCLKDIV_MASK		(EP93XX_SYSCON_I2SCLKDIV_ORIDE | \

					 EP93XX_SYSCON_I2SCLKDIV_SPOL)



int ep93xx_i2s_acquire(unsigned i2s_pins, unsigned i2s_config)

{

	unsigned val;



	/* Sanity check */

	if (i2s_pins & ~EP93XX_SYSCON_DEVCFG_I2S_MASK)

		return -EINVAL;

	if (i2s_config & ~EP93XX_I2SCLKDIV_MASK)

		return -EINVAL;



	/* Must have only one of I2SONSSP/I2SONAC97 set */

	if ((i2s_pins & EP93XX_SYSCON_DEVCFG_I2SONSSP) ==

	    (i2s_pins & EP93XX_SYSCON_DEVCFG_I2SONAC97))

		return -EINVAL;



	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);

	ep93xx_devcfg_set_bits(i2s_pins);



	/*

	 * This is potentially racy with the clock api for i2s_mclk, sclk and 

	 * lrclk. Since the i2s driver is the only user of those clocks we

	 * rely on it to prevent parallel use of this function and the 

	 * clock api for the i2s clocks.

	 */

	val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);

	val &= ~EP93XX_I2SCLKDIV_MASK;

	val |= i2s_config;

	ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);



	return 0;

}

EXPORT_SYMBOL(ep93xx_i2s_acquire);



void ep93xx_i2s_release(void)

{

	ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);

}

EXPORT_SYMBOL(ep93xx_i2s_release);



extern void ep93xx_gpio_init(void);

arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h

+10 −0
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ 
/* APB peripherals */

#define EP93XX_TIMER_BASE		EP93XX_APB_IOMEM(0x00010000)



#define EP93XX_I2S_PHYS_BASE		EP93XX_APB_PHYS(0x00020000)

#define EP93XX_I2S_BASE			EP93XX_APB_IOMEM(0x00020000)



#define EP93XX_SECURITY_BASE		EP93XX_APB_IOMEM(0x00030000)
@@ -193,6 +194,15 @@ 
#define EP93XX_SYSCON_CLKDIV_ESEL	(1<<14)

#define EP93XX_SYSCON_CLKDIV_PSEL	(1<<13)

#define EP93XX_SYSCON_CLKDIV_PDIV_SHIFT	8

#define EP93XX_SYSCON_I2SCLKDIV		EP93XX_SYSCON_REG(0x8c)

#define EP93XX_SYSCON_I2SCLKDIV_SENA	(1<<31)

#define EP93XX_SYSCON_I2SCLKDIV_ORIDE   (1<<29)

#define EP93XX_SYSCON_I2SCLKDIV_SPOL	(1<<19)

#define EP93XX_I2SCLKDIV_SDIV		(1 << 16)

#define EP93XX_I2SCLKDIV_LRDIV32	(0 << 17)

#define EP93XX_I2SCLKDIV_LRDIV64	(1 << 17)

#define EP93XX_I2SCLKDIV_LRDIV128 	(2 << 17)

#define EP93XX_I2SCLKDIV_LRDIV_MASK 	(3 << 17)

#define EP93XX_SYSCON_KEYTCHCLKDIV	EP93XX_SYSCON_REG(0x90)

#define EP93XX_SYSCON_KEYTCHCLKDIV_TSEN	(1<<31)

#define EP93XX_SYSCON_KEYTCHCLKDIV_ADIV	(1<<16)

arch/arm/mach-ep93xx/include/mach/platform.h

+3 −0
Original line number Diff line number Diff line
@@ -43,6 +43,9 @@ void ep93xx_pwm_release_gpio(struct platform_device *pdev); 
void ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data);

int ep93xx_keypad_acquire_gpio(struct platform_device *pdev);

void ep93xx_keypad_release_gpio(struct platform_device *pdev);

void ep93xx_register_i2s(void);

int ep93xx_i2s_acquire(unsigned i2s_pins, unsigned i2s_config);

void ep93xx_i2s_release(void);



void ep93xx_init_devices(void);

extern struct sys_timer ep93xx_timer;