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Commit 69b648a2 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King
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[ARM] 3386/1: AT91RM9200 Clock update 



Patch from Andrew Victor

This patch includes a few changes to the clock support on the
AT91RM9200.

1. Added definitions for Ethernet, MMC, TWI, USARTs, and SPI peripheral
clocks.

2. Replaced some hard-coded hex values with the text definitions in
at91rm9200_sys.h.

3. If the USB96M bit is set for PLLB, then the rate of PLLB is not
affected but only the USB Host/Device clocks which are derived from it.
Issue reported by Sergei Sharonov.

Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 39806805

arch/arm/mach-at91rm9200/clock.c

+73 −12
Original line number Diff line number Diff line
@@ -201,6 +201,54 @@ static struct clk ohci_clk = { 
	.pmc_mask	= 1 << AT91_ID_UHP,

	.mode		= pmc_periph_mode,

};

static struct clk ether_clk = {

	.name		= "ether_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_EMAC,

	.mode		= pmc_periph_mode,

};

static struct clk mmc_clk = {

	.name		= "mci_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_MCI,

	.mode		= pmc_periph_mode,

};

static struct clk twi_clk = {

	.name		= "twi_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_TWI,

	.mode		= pmc_periph_mode,

};

static struct clk usart0_clk = {

	.name		= "usart0_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_US0,

	.mode		= pmc_periph_mode,

};

static struct clk usart1_clk = {

	.name		= "usart1_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_US1,

	.mode		= pmc_periph_mode,

};

static struct clk usart2_clk = {

	.name		= "usart2_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_US2,

	.mode		= pmc_periph_mode,

};

static struct clk usart3_clk = {

	.name		= "usart3_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_US3,

	.mode		= pmc_periph_mode,

};

static struct clk spi_clk = {

	.name		= "spi0_clk",

	.parent		= &mck,

	.pmc_mask	= 1 << AT91_ID_SPI,

	.mode		= pmc_periph_mode,

};



static struct clk *const clock_list[] = {

	/* four primary clocks -- MUST BE FIRST! */
@@ -223,15 +271,18 @@ static struct clk *const clock_list[] = { 


	/* MCK and peripherals */

	&mck,

	// usart0..usart3

	// mmc

	&usart0_clk,

	&usart1_clk,

	&usart2_clk,

	&usart3_clk,

	&mmc_clk,

	&udc_clk,

	// i2c

	// spi

	&twi_clk,

	&spi_clk,

	// ssc0..ssc2

	// tc0..tc5

	&ohci_clk,

	// ether

	&ether_clk,

};
@@ -360,7 +411,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate) 
			u32	pckr;



			pckr = at91_sys_read(AT91_PMC_PCKR(clk->id));

			pckr &= 0x03;

			pckr &= AT91_PMC_CSS_PLLB;	/* clock selection */

			pckr |= prescale << 2;

			at91_sys_write(AT91_PMC_PCKR(clk->id), pckr);

			clk->rate_hz = actual;
@@ -440,7 +491,7 @@ static int at91_clk_show(struct seq_file *s, void *unused) 
		else

			state = "";



		seq_printf(s, "%-10s users=%d %-3s %9ld Hz %s\n",

		seq_printf(s, "%-10s users=%2d %-3s %9ld Hz %s\n",

			clk->name, clk->users, state, clk_get_rate(clk),

			clk->parent ? clk->parent->name : "");

	}
@@ -483,8 +534,15 @@ static u32 __init at91_pll_rate(struct clk *pll, u32 freq, u32 reg) 
		freq *= mul + 1;

	} else

		freq = 0;

	if (pll == &pllb && (reg & (1 << 28)))

		freq /= 2;



	return freq;

}



static u32 __init at91_usb_rate(struct clk *pll, u32 freq, u32 reg)

{

	if (pll == &pllb && (reg & AT91_PMC_USB96M))

		return freq / 2;

	else

		return freq;

}
@@ -550,8 +608,8 @@ int __init at91_clock_init(unsigned long main_clock) 
	if (!main_clock) {

		do {

			tmp = at91_sys_read(AT91_CKGR_MCFR);

		} while (!(tmp & 0x10000));

		main_clock = (tmp & 0xffff) * (AT91_SLOW_CLOCK / 16);

		} while (!(tmp & AT91_PMC_MAINRDY));

		main_clock = (tmp & AT91_PMC_MAINF) * (AT91_SLOW_CLOCK / 16);

	}

	main_clk.rate_hz = main_clock;
@@ -566,13 +624,16 @@ int __init at91_clock_init(unsigned long main_clock) 
	 *

	 * REVISIT:  assumes MCK doesn't derive from PLLB!

	 */

	at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | 0x10000000;

	at91_pllb_usb_init = at91_pll_calc(main_clock, 48000000 * 2) | AT91_PMC_USB96M;

	pllb.rate_hz = at91_pll_rate(&pllb, main_clock, at91_pllb_usb_init);

	at91_sys_write(AT91_PMC_PCDR, (1 << AT91_ID_UHP) | (1 << AT91_ID_UDP));

	at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP | AT91_PMC_UDP);

	at91_sys_write(AT91_CKGR_PLLBR, 0);

	at91_sys_write(AT91_PMC_SCER, AT91_PMC_MCKUDP);



	udpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, at91_pllb_usb_init);

	uhpck.rate_hz = at91_usb_rate(&pllb, pllb.rate_hz, at91_pllb_usb_init);



	/*

	 * MCK and CPU derive from one of those primary clocks.

	 * For now, assume this parentage won't change.