arch/arm/plat-omap/common.c - kernel/msm - Gitiles

 /*
  * linux/arch/arm/plat-omap/common.c
  *
  * Code common to all OMAP machines.
  * The file is created by Tony Lindgren <tony@atomide.com>
  *
  * Copyright (C) 2009 Texas Instruments
  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/console.h>
 #include <linux/serial.h>
 #include <linux/tty.h>
 #include <linux/serial_8250.h>
 #include <linux/serial_reg.h>
 #include <linux/clk.h>
 #include <linux/io.h>

 #include <mach/hardware.h>
 #include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/mach/map.h>
 #include <asm/setup.h>

 #include <plat/common.h>
 #include <plat/board.h>
 #include <plat/control.h>
 #include <plat/mux.h>
 #include <plat/fpga.h>
 #include <plat/serial.h>

 #include <plat/clock.h>

 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 # include "../mach-omap2/sdrc.h"
 #endif

 #define NO_LENGTH_CHECK 0xffffffff

 struct omap_board_config_kernel *omap_board_config;
 int omap_board_config_size;

 /* used by omap-smp.c and board-4430sdp.c */
 void __iomem *gic_cpu_base_addr;

 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
 {
 	struct omap_board_config_kernel *kinfo = NULL;
 	int i;

 	/* Try to find the config from the board-specific structures
 	 * in the kernel. */
 	for (i = 0; i < omap_board_config_size; i++) {
 		if (omap_board_config[i].tag == tag) {
 			if (skip == 0) {
 				kinfo = &omap_board_config[i];
 				break;
 			} else {
 				skip--;
 			}
 		}
 	}
 	if (kinfo == NULL)
 		return NULL;
 	return kinfo->data;
 }

 const void *__omap_get_config(u16 tag, size_t len, int nr)
 {
         return get_config(tag, len, nr, NULL);
 }
 EXPORT_SYMBOL(__omap_get_config);

 const void *omap_get_var_config(u16 tag, size_t *len)
 {
         return get_config(tag, NO_LENGTH_CHECK, 0, len);
 }
 EXPORT_SYMBOL(omap_get_var_config);

 /*
  * 32KHz clocksource ... always available, on pretty most chips except
  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
  * but systems won't necessarily want to spend resources that way.
  */

 #define OMAP16XX_TIMER_32K_SYNCHRONIZED		0xfffbc410

 #if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))

 #include <linux/clocksource.h>

 /*
  * offset_32k holds the init time counter value. It is then subtracted
  * from every counter read to achieve a counter that counts time from the
  * kernel boot (needed for sched_clock()).
  */
 static u32 offset_32k __read_mostly;

 #ifdef CONFIG_ARCH_OMAP16XX
 static cycle_t omap16xx_32k_read(struct clocksource *cs)
 {
 	return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED) - offset_32k;
 }
 #else
 #define omap16xx_32k_read	NULL
 #endif

 #ifdef CONFIG_ARCH_OMAP2420
 static cycle_t omap2420_32k_read(struct clocksource *cs)
 {
 	return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10) - offset_32k;
 }
 #else
 #define omap2420_32k_read	NULL
 #endif

 #ifdef CONFIG_ARCH_OMAP2430
 static cycle_t omap2430_32k_read(struct clocksource *cs)
 {
 	return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10) - offset_32k;
 }
 #else
 #define omap2430_32k_read	NULL
 #endif

 #ifdef CONFIG_ARCH_OMAP3
 static cycle_t omap34xx_32k_read(struct clocksource *cs)
 {
 	return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10) - offset_32k;
 }
 #else
 #define omap34xx_32k_read	NULL
 #endif

 #ifdef CONFIG_ARCH_OMAP4
 static cycle_t omap44xx_32k_read(struct clocksource *cs)
 {
 	return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10) - offset_32k;
 }
 #else
 #define omap44xx_32k_read	NULL
 #endif

 /*
  * Kernel assumes that sched_clock can be called early but may not have
  * things ready yet.
  */
 static cycle_t omap_32k_read_dummy(struct clocksource *cs)
 {
 	return 0;
 }

 static struct clocksource clocksource_32k = {
 	.name		= "32k_counter",
 	.rating		= 250,
 	.read		= omap_32k_read_dummy,
 	.mask		= CLOCKSOURCE_MASK(32),
 	.shift		= 10,
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };

 /*
  * Returns current time from boot in nsecs. It's OK for this to wrap
  * around for now, as it's just a relative time stamp.
  */
 unsigned long long sched_clock(void)
 {
 	return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
 				  clocksource_32k.mult, clocksource_32k.shift);
 }

 /**
  * read_persistent_clock -  Return time from a persistent clock.
  *
  * Reads the time from a source which isn't disabled during PM, the
  * 32k sync timer.  Convert the cycles elapsed since last read into
  * nsecs and adds to a monotonically increasing timespec.
  */
 static struct timespec persistent_ts;
 static cycles_t cycles, last_cycles;
 void read_persistent_clock(struct timespec *ts)
 {
 	unsigned long long nsecs;
 	cycles_t delta;
 	struct timespec *tsp = &persistent_ts;

 	last_cycles = cycles;
 	cycles = clocksource_32k.read(&clocksource_32k);
 	delta = cycles - last_cycles;

 	nsecs = clocksource_cyc2ns(delta,
 				   clocksource_32k.mult, clocksource_32k.shift);

 	timespec_add_ns(tsp, nsecs);
 	*ts = *tsp;
 }

 static int __init omap_init_clocksource_32k(void)
 {
 	static char err[] __initdata = KERN_ERR
 			"%s: can't register clocksource!\n";

 	if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 		struct clk *sync_32k_ick;

 		if (cpu_is_omap16xx())
 			clocksource_32k.read = omap16xx_32k_read;
 		else if (cpu_is_omap2420())
 			clocksource_32k.read = omap2420_32k_read;
 		else if (cpu_is_omap2430())
 			clocksource_32k.read = omap2430_32k_read;
 		else if (cpu_is_omap34xx())
 			clocksource_32k.read = omap34xx_32k_read;
 		else if (cpu_is_omap44xx())
 			clocksource_32k.read = omap44xx_32k_read;
 		else
 			return -ENODEV;

 		sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 		if (sync_32k_ick)
 			clk_enable(sync_32k_ick);

 		clocksource_32k.mult = clocksource_hz2mult(32768,
 					    clocksource_32k.shift);

 		offset_32k = clocksource_32k.read(&clocksource_32k);

 		if (clocksource_register(&clocksource_32k))
 			printk(err, clocksource_32k.name);
 	}
 	return 0;
 }
 arch_initcall(omap_init_clocksource_32k);

 #endif	/* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */

 /* Global address base setup code */

 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)

 static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
 {
 	omap2_set_globals_tap(omap2_globals);
 	omap2_set_globals_sdrc(omap2_globals);
 	omap2_set_globals_control(omap2_globals);
 	omap2_set_globals_prcm(omap2_globals);
 	omap2_set_globals_uart(omap2_globals);
 }

 #endif

 #if defined(CONFIG_ARCH_OMAP2420)

 static struct omap_globals omap242x_globals = {
 	.class	= OMAP242X_CLASS,
 	.tap	= OMAP2_L4_IO_ADDRESS(0x48014000),
 	.sdrc	= OMAP2420_SDRC_BASE,
 	.sms	= OMAP2420_SMS_BASE,
 	.ctrl	= OMAP2420_CTRL_BASE,
 	.prm	= OMAP2420_PRM_BASE,
 	.cm	= OMAP2420_CM_BASE,
 	.uart1_phys	= OMAP2_UART1_BASE,
 	.uart2_phys	= OMAP2_UART2_BASE,
 	.uart3_phys	= OMAP2_UART3_BASE,
 };

 void __init omap2_set_globals_242x(void)
 {
 	__omap2_set_globals(&omap242x_globals);
 }
 #endif

 #if defined(CONFIG_ARCH_OMAP2430)

 static struct omap_globals omap243x_globals = {
 	.class	= OMAP243X_CLASS,
 	.tap	= OMAP2_L4_IO_ADDRESS(0x4900a000),
 	.sdrc	= OMAP243X_SDRC_BASE,
 	.sms	= OMAP243X_SMS_BASE,
 	.ctrl	= OMAP243X_CTRL_BASE,
 	.prm	= OMAP2430_PRM_BASE,
 	.cm	= OMAP2430_CM_BASE,
 	.uart1_phys	= OMAP2_UART1_BASE,
 	.uart2_phys	= OMAP2_UART2_BASE,
 	.uart3_phys	= OMAP2_UART3_BASE,
 };

 void __init omap2_set_globals_243x(void)
 {
 	__omap2_set_globals(&omap243x_globals);
 }
 #endif

 #if defined(CONFIG_ARCH_OMAP3)

 static struct omap_globals omap3_globals = {
 	.class	= OMAP343X_CLASS,
 	.tap	= OMAP2_L4_IO_ADDRESS(0x4830A000),
 	.sdrc	= OMAP343X_SDRC_BASE,
 	.sms	= OMAP343X_SMS_BASE,
 	.ctrl	= OMAP343X_CTRL_BASE,
 	.prm	= OMAP3430_PRM_BASE,
 	.cm	= OMAP3430_CM_BASE,
 	.uart1_phys	= OMAP3_UART1_BASE,
 	.uart2_phys	= OMAP3_UART2_BASE,
 	.uart3_phys	= OMAP3_UART3_BASE,
 };

 void __init omap2_set_globals_343x(void)
 {
 	__omap2_set_globals(&omap3_globals);
 }

 void __init omap2_set_globals_36xx(void)
 {
 	omap3_globals.uart4_phys = OMAP3_UART4_BASE;

 	__omap2_set_globals(&omap3_globals);
 }
 #endif

 #if defined(CONFIG_ARCH_OMAP4)
 static struct omap_globals omap4_globals = {
 	.class	= OMAP443X_CLASS,
 	.tap	= OMAP2_L4_IO_ADDRESS(OMAP443X_SCM_BASE),
 	.ctrl	= OMAP443X_CTRL_BASE,
 	.prm	= OMAP4430_PRM_BASE,
 	.cm	= OMAP4430_CM_BASE,
 	.cm2	= OMAP4430_CM2_BASE,
 	.uart1_phys	= OMAP4_UART1_BASE,
 	.uart2_phys	= OMAP4_UART2_BASE,
 	.uart3_phys	= OMAP4_UART3_BASE,
 	.uart4_phys	= OMAP4_UART4_BASE,
 };

 void __init omap2_set_globals_443x(void)
 {
 	omap2_set_globals_tap(&omap4_globals);
 	omap2_set_globals_control(&omap4_globals);
 	omap2_set_globals_prcm(&omap4_globals);
 	omap2_set_globals_uart(&omap4_globals);
 }
 #endif
	/*
	* linux/arch/arm/plat-omap/common.c
	*
	* Code common to all OMAP machines.
	* The file is created by Tony Lindgren <tony@atomide.com>
	*
	* Copyright (C) 2009 Texas Instruments
	* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/console.h>
	#include <linux/serial.h>
	#include <linux/tty.h>
	#include <linux/serial_8250.h>
	#include <linux/serial_reg.h>
	#include <linux/clk.h>
	#include <linux/io.h>

	#include <mach/hardware.h>
	#include <asm/system.h>
	#include <asm/pgtable.h>
	#include <asm/mach/map.h>
	#include <asm/setup.h>

	#include <plat/common.h>
	#include <plat/board.h>
	#include <plat/control.h>
	#include <plat/mux.h>
	#include <plat/fpga.h>
	#include <plat/serial.h>

	#include <plat/clock.h>

	#if defined(CONFIG_ARCH_OMAP2) \|\| defined(CONFIG_ARCH_OMAP3)
	# include "../mach-omap2/sdrc.h"
	#endif

	#define NO_LENGTH_CHECK 0xffffffff

	struct omap_board_config_kernel *omap_board_config;
	int omap_board_config_size;

	/* used by omap-smp.c and board-4430sdp.c */
	void __iomem *gic_cpu_base_addr;

	static const void get_config(u16 tag, size_t len, int skip, size_t len_out)
	{
	struct omap_board_config_kernel *kinfo = NULL;
	int i;

	/* Try to find the config from the board-specific structures
	* in the kernel. */
	for (i = 0; i < omap_board_config_size; i++) {
	if (omap_board_config[i].tag == tag) {
	if (skip == 0) {
	kinfo = &omap_board_config[i];
	break;
	} else {
	skip--;
	}
	}
	}
	if (kinfo == NULL)
	return NULL;
	return kinfo->data;
	}

	const void *__omap_get_config(u16 tag, size_t len, int nr)
	{
	return get_config(tag, len, nr, NULL);
	}
	EXPORT_SYMBOL(__omap_get_config);

	const void omap_get_var_config(u16 tag, size_t len)
	{
	return get_config(tag, NO_LENGTH_CHECK, 0, len);
	}
	EXPORT_SYMBOL(omap_get_var_config);

	/*
	* 32KHz clocksource ... always available, on pretty most chips except
	* OMAP 730 and 1510. Other timers could be used as clocksources, with
	* higher resolution in free-running counter modes (e.g. 12 MHz xtal),
	* but systems won't necessarily want to spend resources that way.
	*/

	#define OMAP16XX_TIMER_32K_SYNCHRONIZED 0xfffbc410

	#if !(defined(CONFIG_ARCH_OMAP730) \|\| defined(CONFIG_ARCH_OMAP15XX))

	#include <linux/clocksource.h>

	/*
	* offset_32k holds the init time counter value. It is then subtracted
	* from every counter read to achieve a counter that counts time from the
	* kernel boot (needed for sched_clock()).
	*/
	static u32 offset_32k __read_mostly;

	#ifdef CONFIG_ARCH_OMAP16XX
	static cycle_t omap16xx_32k_read(struct clocksource *cs)
	{
	return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED) - offset_32k;
	}
	#else
	#define omap16xx_32k_read NULL
	#endif

	#ifdef CONFIG_ARCH_OMAP2420
	static cycle_t omap2420_32k_read(struct clocksource *cs)
	{
	return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10) - offset_32k;
	}
	#else
	#define omap2420_32k_read NULL
	#endif

	#ifdef CONFIG_ARCH_OMAP2430
	static cycle_t omap2430_32k_read(struct clocksource *cs)
	{
	return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10) - offset_32k;
	}
	#else
	#define omap2430_32k_read NULL
	#endif

	#ifdef CONFIG_ARCH_OMAP3
	static cycle_t omap34xx_32k_read(struct clocksource *cs)
	{
	return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10) - offset_32k;
	}
	#else
	#define omap34xx_32k_read NULL
	#endif

	#ifdef CONFIG_ARCH_OMAP4
	static cycle_t omap44xx_32k_read(struct clocksource *cs)
	{
	return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10) - offset_32k;
	}
	#else
	#define omap44xx_32k_read NULL
	#endif

	/*
	* Kernel assumes that sched_clock can be called early but may not have
	* things ready yet.
	*/
	static cycle_t omap_32k_read_dummy(struct clocksource *cs)
	{
	return 0;
	}

	static struct clocksource clocksource_32k = {
	.name = "32k_counter",
	.rating = 250,
	.read = omap_32k_read_dummy,
	.mask = CLOCKSOURCE_MASK(32),
	.shift = 10,
	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	};

	/*
	* Returns current time from boot in nsecs. It's OK for this to wrap
	* around for now, as it's just a relative time stamp.
	*/
	unsigned long long sched_clock(void)
	{
	return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
	clocksource_32k.mult, clocksource_32k.shift);
	}

	/**
	* read_persistent_clock - Return time from a persistent clock.
	*
	* Reads the time from a source which isn't disabled during PM, the
	* 32k sync timer. Convert the cycles elapsed since last read into
	* nsecs and adds to a monotonically increasing timespec.
	*/
	static struct timespec persistent_ts;
	static cycles_t cycles, last_cycles;
	void read_persistent_clock(struct timespec *ts)
	{
	unsigned long long nsecs;
	cycles_t delta;
	struct timespec *tsp = &persistent_ts;

	last_cycles = cycles;
	cycles = clocksource_32k.read(&clocksource_32k);
	delta = cycles - last_cycles;

	nsecs = clocksource_cyc2ns(delta,
	clocksource_32k.mult, clocksource_32k.shift);

	timespec_add_ns(tsp, nsecs);
	ts = tsp;
	}

	static int __init omap_init_clocksource_32k(void)
	{
	static char err[] __initdata = KERN_ERR
	"%s: can't register clocksource!\n";

	if (cpu_is_omap16xx() \|\| cpu_class_is_omap2()) {
	struct clk *sync_32k_ick;

	if (cpu_is_omap16xx())
	clocksource_32k.read = omap16xx_32k_read;
	else if (cpu_is_omap2420())
	clocksource_32k.read = omap2420_32k_read;
	else if (cpu_is_omap2430())
	clocksource_32k.read = omap2430_32k_read;
	else if (cpu_is_omap34xx())
	clocksource_32k.read = omap34xx_32k_read;
	else if (cpu_is_omap44xx())
	clocksource_32k.read = omap44xx_32k_read;
	else
	return -ENODEV;

	sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
	if (sync_32k_ick)
	clk_enable(sync_32k_ick);

	clocksource_32k.mult = clocksource_hz2mult(32768,
	clocksource_32k.shift);

	offset_32k = clocksource_32k.read(&clocksource_32k);

	if (clocksource_register(&clocksource_32k))
	printk(err, clocksource_32k.name);
	}
	return 0;
	}
	arch_initcall(omap_init_clocksource_32k);

	#endif /* !(defined(CONFIG_ARCH_OMAP730) \|\| defined(CONFIG_ARCH_OMAP15XX)) */

	/* Global address base setup code */

	#if defined(CONFIG_ARCH_OMAP2) \|\| defined(CONFIG_ARCH_OMAP3)

	static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
	{
	omap2_set_globals_tap(omap2_globals);
	omap2_set_globals_sdrc(omap2_globals);
	omap2_set_globals_control(omap2_globals);
	omap2_set_globals_prcm(omap2_globals);
	omap2_set_globals_uart(omap2_globals);
	}

	#endif

	#if defined(CONFIG_ARCH_OMAP2420)

	static struct omap_globals omap242x_globals = {
	.class = OMAP242X_CLASS,
	.tap = OMAP2_L4_IO_ADDRESS(0x48014000),
	.sdrc = OMAP2420_SDRC_BASE,
	.sms = OMAP2420_SMS_BASE,
	.ctrl = OMAP2420_CTRL_BASE,
	.prm = OMAP2420_PRM_BASE,
	.cm = OMAP2420_CM_BASE,
	.uart1_phys = OMAP2_UART1_BASE,
	.uart2_phys = OMAP2_UART2_BASE,
	.uart3_phys = OMAP2_UART3_BASE,
	};

	void __init omap2_set_globals_242x(void)
	{
	__omap2_set_globals(&omap242x_globals);
	}
	#endif

	#if defined(CONFIG_ARCH_OMAP2430)

	static struct omap_globals omap243x_globals = {
	.class = OMAP243X_CLASS,
	.tap = OMAP2_L4_IO_ADDRESS(0x4900a000),
	.sdrc = OMAP243X_SDRC_BASE,
	.sms = OMAP243X_SMS_BASE,
	.ctrl = OMAP243X_CTRL_BASE,
	.prm = OMAP2430_PRM_BASE,
	.cm = OMAP2430_CM_BASE,
	.uart1_phys = OMAP2_UART1_BASE,
	.uart2_phys = OMAP2_UART2_BASE,
	.uart3_phys = OMAP2_UART3_BASE,
	};

	void __init omap2_set_globals_243x(void)
	{
	__omap2_set_globals(&omap243x_globals);
	}
	#endif

	#if defined(CONFIG_ARCH_OMAP3)

	static struct omap_globals omap3_globals = {
	.class = OMAP343X_CLASS,
	.tap = OMAP2_L4_IO_ADDRESS(0x4830A000),
	.sdrc = OMAP343X_SDRC_BASE,
	.sms = OMAP343X_SMS_BASE,
	.ctrl = OMAP343X_CTRL_BASE,
	.prm = OMAP3430_PRM_BASE,
	.cm = OMAP3430_CM_BASE,
	.uart1_phys = OMAP3_UART1_BASE,
	.uart2_phys = OMAP3_UART2_BASE,
	.uart3_phys = OMAP3_UART3_BASE,
	};

	void __init omap2_set_globals_343x(void)
	{
	__omap2_set_globals(&omap3_globals);
	}

	void __init omap2_set_globals_36xx(void)
	{
	omap3_globals.uart4_phys = OMAP3_UART4_BASE;

	__omap2_set_globals(&omap3_globals);
	}
	#endif

	#if defined(CONFIG_ARCH_OMAP4)
	static struct omap_globals omap4_globals = {
	.class = OMAP443X_CLASS,
	.tap = OMAP2_L4_IO_ADDRESS(OMAP443X_SCM_BASE),
	.ctrl = OMAP443X_CTRL_BASE,
	.prm = OMAP4430_PRM_BASE,
	.cm = OMAP4430_CM_BASE,
	.cm2 = OMAP4430_CM2_BASE,
	.uart1_phys = OMAP4_UART1_BASE,
	.uart2_phys = OMAP4_UART2_BASE,
	.uart3_phys = OMAP4_UART3_BASE,
	.uart4_phys = OMAP4_UART4_BASE,
	};

	void __init omap2_set_globals_443x(void)
	{
	omap2_set_globals_tap(&omap4_globals);
	omap2_set_globals_control(&omap4_globals);
	omap2_set_globals_prcm(&omap4_globals);
	omap2_set_globals_uart(&omap4_globals);
	}
	#endif