Commit a613163d authored by Linus Walleij's avatar Linus Walleij Committed by Mike Turquette
Browse files

ARM: integrator: convert to common clock 



This converts the Integrator platform to use common clock
and the ICST driver. Since from this point not all ARM
reference platforms use the clock, we define
CONFIG_PLAT_VERSATILE_CLOCK and select it for all platforms
except the Integrator.

Open issue: I could not use the .init_early() field of the
machine descriptor to initialize the clocks, but had to
move them to .init_irq(), so presumably .init_early() is
so early that common clock is not up, and .init_machine()
is too late since it's needed for the clockevent/clocksource
initialization. Any suggestions on how to solve this is
very welcome.

Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
[mturquette@linaro.org: use 'select' instead of versatile Kconfig]
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 91b87a47

arch/arm/Kconfig

+5 −2
Original line number Diff line number Diff line
@@ -254,8 +254,8 @@ config ARCH_INTEGRATOR 
	bool "ARM Ltd. Integrator family"

	select ARM_AMBA

	select ARCH_HAS_CPUFREQ

	select CLKDEV_LOOKUP

	select HAVE_MACH_CLKDEV

	select COMMON_CLK

	select CLK_VERSATILE

	select HAVE_TCM

	select ICST

	select GENERIC_CLOCKEVENTS
@@ -277,6 +277,7 @@ config ARCH_REALVIEW 
	select GENERIC_CLOCKEVENTS

	select ARCH_WANT_OPTIONAL_GPIOLIB

	select PLAT_VERSATILE

	select PLAT_VERSATILE_CLOCK

	select PLAT_VERSATILE_CLCD

	select ARM_TIMER_SP804

	select GPIO_PL061 if GPIOLIB
@@ -295,6 +296,7 @@ config ARCH_VERSATILE 
	select ARCH_WANT_OPTIONAL_GPIOLIB

	select NEED_MACH_IO_H if PCI

	select PLAT_VERSATILE

	select PLAT_VERSATILE_CLOCK

	select PLAT_VERSATILE_CLCD

	select PLAT_VERSATILE_FPGA_IRQ

	select ARM_TIMER_SP804
@@ -314,6 +316,7 @@ config ARCH_VEXPRESS 
	select ICST

	select NO_IOPORT

	select PLAT_VERSATILE

	select PLAT_VERSATILE_CLOCK

	select PLAT_VERSATILE_CLCD

	help

	  This enables support for the ARM Ltd Versatile Express boards.

arch/arm/mach-integrator/core.c

+0 −45
Original line number Diff line number Diff line
@@ -21,7 +21,6 @@ 
#include <linux/amba/bus.h>

#include <linux/amba/serial.h>

#include <linux/io.h>

#include <linux/clkdev.h>



#include <mach/hardware.h>

#include <mach/platform.h>
@@ -61,50 +60,6 @@ static struct amba_device *amba_devs[] __initdata = { 
	&kmi1_device,

};



/*

 * These are fixed clocks.

 */

static struct clk clk24mhz = {

	.rate	= 24000000,

};



static struct clk uartclk = {

	.rate	= 14745600,

};



static struct clk dummy_apb_pclk;



static struct clk_lookup lookups[] = {

	{	/* Bus clock */

		.con_id		= "apb_pclk",

		.clk		= &dummy_apb_pclk,

	}, {

		/* Integrator/AP timer frequency */

		.dev_id		= "ap_timer",

		.clk		= &clk24mhz,

	}, {	/* UART0 */

		.dev_id		= "uart0",

		.clk		= &uartclk,

	}, {	/* UART1 */

		.dev_id		= "uart1",

		.clk		= &uartclk,

	}, {	/* KMI0 */

		.dev_id		= "kmi0",

		.clk		= &clk24mhz,

	}, {	/* KMI1 */

		.dev_id		= "kmi1",

		.clk		= &clk24mhz,

	}, {	/* MMCI - IntegratorCP */

		.dev_id		= "mmci",

		.clk		= &uartclk,

	}

};



void __init integrator_init_early(void)

{

	clkdev_add_table(lookups, ARRAY_SIZE(lookups));

}



static int __init integrator_init(void)

{

	int i;

arch/arm/mach-integrator/include/mach/clkdev.h

deleted100644 → 0
+0 −26
Original line number Diff line number Diff line 
#ifndef __ASM_MACH_CLKDEV_H

#define __ASM_MACH_CLKDEV_H



#include <linux/module.h>

#include <plat/clock.h>



struct clk {

	unsigned long		rate;

	const struct clk_ops	*ops;

	struct module		*owner;

	const struct icst_params *params;

	void __iomem		*vcoreg;

	void			*data;

};



static inline int __clk_get(struct clk *clk)

{

	return try_module_get(clk->owner);

}



static inline void __clk_put(struct clk *clk)

{

	module_put(clk->owner);

}



#endif

arch/arm/mach-integrator/integrator_ap.c

+7 −1
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <linux/io.h>

#include <linux/mtd/physmap.h>

#include <linux/clk.h>

#include <linux/platform_data/clk-integrator.h>

#include <video/vga.h>



#include <mach/hardware.h>
@@ -174,6 +175,7 @@ static void __init ap_init_irq(void) 


	fpga_irq_init(VA_IC_BASE, "SC", IRQ_PIC_START,

		-1, INTEGRATOR_SC_VALID_INT, NULL);

	integrator_clk_init(false);

}



#ifdef CONFIG_PM
@@ -440,6 +442,10 @@ static void integrator_clockevent_init(unsigned long inrate) 
					0xffffU);

}



void __init ap_init_early(void)

{

}



/*

 * Set up timer(s).

 */
@@ -471,7 +477,7 @@ MACHINE_START(INTEGRATOR, "ARM-Integrator") 
	.reserve	= integrator_reserve,

	.map_io		= ap_map_io,

	.nr_irqs	= NR_IRQS_INTEGRATOR_AP,

	.init_early	= integrator_init_early,

	.init_early	= ap_init_early,

	.init_irq	= ap_init_irq,

	.handle_irq	= fpga_handle_irq,

	.timer		= &ap_timer,

arch/arm/mach-integrator/integrator_cp.c

+2 −61
Original line number Diff line number Diff line
@@ -21,8 +21,8 @@ 
#include <linux/amba/mmci.h>

#include <linux/io.h>

#include <linux/gfp.h>

#include <linux/clkdev.h>

#include <linux/mtd/physmap.h>

#include <linux/platform_data/clk-integrator.h>



#include <mach/hardware.h>

#include <mach/platform.h>
@@ -171,64 +171,9 @@ static void __init intcp_init_irq(void) 


	fpga_irq_init(INTCP_VA_SIC_BASE, "SIC", IRQ_SIC_START,

		      IRQ_CP_CPPLDINT, sic_mask, NULL);

	integrator_clk_init(true);

}



/*

 * Clock handling

 */

#define CM_LOCK		(__io_address(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_LOCK_OFFSET)

#define CM_AUXOSC	(__io_address(INTEGRATOR_HDR_BASE)+0x1c)



static const struct icst_params cp_auxvco_params = {

	.ref		= 24000000,

	.vco_max	= ICST525_VCO_MAX_5V,

	.vco_min	= ICST525_VCO_MIN,

	.vd_min 	= 8,

	.vd_max 	= 263,

	.rd_min 	= 3,

	.rd_max 	= 65,

	.s2div		= icst525_s2div,

	.idx2s		= icst525_idx2s,

};



static void cp_auxvco_set(struct clk *clk, struct icst_vco vco)

{

	u32 val;



	val = readl(clk->vcoreg) & ~0x7ffff;

	val |= vco.v | (vco.r << 9) | (vco.s << 16);



	writel(0xa05f, CM_LOCK);

	writel(val, clk->vcoreg);

	writel(0, CM_LOCK);

}



static const struct clk_ops cp_auxclk_ops = {

	.round	= icst_clk_round,

	.set	= icst_clk_set,

	.setvco	= cp_auxvco_set,

};



static struct clk cp_auxclk = {

	.ops	= &cp_auxclk_ops,

	.params	= &cp_auxvco_params,

	.vcoreg	= CM_AUXOSC,

};



static struct clk sp804_clk = {

	.rate	= 1000000,

};



static struct clk_lookup cp_lookups[] = {

	{	/* CLCD */

		.dev_id		= "clcd",

		.clk		= &cp_auxclk,

	}, {	/* SP804 timers */

		.dev_id		= "sp804",

		.clk		= &sp804_clk,

	},

};



/*

 * Flash handling.

 */
@@ -406,10 +351,6 @@ static struct amba_device *amba_devs[] __initdata = { 


static void __init intcp_init_early(void)

{

	clkdev_add_table(cp_lookups, ARRAY_SIZE(cp_lookups));



	integrator_init_early();



#ifdef CONFIG_PLAT_VERSATILE_SCHED_CLOCK

	versatile_sched_clock_init(REFCOUNTER, 24000000);

#endif

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