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Commit 5946fa3d authored by Jan Beulich's avatar Jan Beulich Committed by Ingo Molnar
Browse files

x86, hpet: Simplify the HPET code 



On 64-bits, using unsigned long when unsigned int suffices
needlessly creates larger code (due to the need for REX
prefixes), and most of the logic in hpet.c really doesn't need
64-bit operations.

At once this avoids the need for a couple of type casts.

Signed-off-by: default avatarJan Beulich <jbeulich@novell.com>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
LKML-Reference: <4A8BC9780200007800010832@vpn.id2.novell.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 39fe05e5

arch/x86/include/asm/hpet.h

+1 −1
Original line number Diff line number Diff line
@@ -69,7 +69,7 @@ extern int hpet_force_user; 
extern int is_hpet_enabled(void);

extern int hpet_enable(void);

extern void hpet_disable(void);

extern unsigned long hpet_readl(unsigned long a);

extern unsigned int hpet_readl(unsigned int a);

extern void force_hpet_resume(void);



extern void hpet_msi_unmask(unsigned int irq);

arch/x86/kernel/hpet.c

+23 −22
Original line number Diff line number Diff line
@@ -47,12 +47,12 @@ struct hpet_dev { 
	char				name[10];

};



unsigned long hpet_readl(unsigned long a)

inline unsigned int hpet_readl(unsigned int a)

{

	return readl(hpet_virt_address + a);

}



static inline void hpet_writel(unsigned long d, unsigned long a)

static inline void hpet_writel(unsigned int d, unsigned int a)

{

	writel(d, hpet_virt_address + a);

}
@@ -167,7 +167,7 @@ do { \ 


static void hpet_reserve_msi_timers(struct hpet_data *hd);



static void hpet_reserve_platform_timers(unsigned long id)

static void hpet_reserve_platform_timers(unsigned int id)

{

	struct hpet __iomem *hpet = hpet_virt_address;

	struct hpet_timer __iomem *timer = &hpet->hpet_timers[2];
@@ -205,7 +205,7 @@ static void hpet_reserve_platform_timers(unsigned long id) 


}

#else

static void hpet_reserve_platform_timers(unsigned long id) { }

static void hpet_reserve_platform_timers(unsigned int id) { }

#endif



/*
@@ -246,7 +246,7 @@ static void hpet_reset_counter(void) 


static void hpet_start_counter(void)

{

	unsigned long cfg = hpet_readl(HPET_CFG);

	unsigned int cfg = hpet_readl(HPET_CFG);

	cfg |= HPET_CFG_ENABLE;

	hpet_writel(cfg, HPET_CFG);

}
@@ -271,7 +271,7 @@ static void hpet_resume_counter(void) 


static void hpet_enable_legacy_int(void)

{

	unsigned long cfg = hpet_readl(HPET_CFG);

	unsigned int cfg = hpet_readl(HPET_CFG);



	cfg |= HPET_CFG_LEGACY;

	hpet_writel(cfg, HPET_CFG);
@@ -314,7 +314,7 @@ static int hpet_setup_msi_irq(unsigned int irq); 
static void hpet_set_mode(enum clock_event_mode mode,

			  struct clock_event_device *evt, int timer)

{

	unsigned long cfg, cmp, now;

	unsigned int cfg, cmp, now;

	uint64_t delta;



	switch (mode) {
@@ -323,7 +323,7 @@ static void hpet_set_mode(enum clock_event_mode mode, 
		delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult;

		delta >>= evt->shift;

		now = hpet_readl(HPET_COUNTER);

		cmp = now + (unsigned long) delta;

		cmp = now + (unsigned int) delta;

		cfg = hpet_readl(HPET_Tn_CFG(timer));

		/* Make sure we use edge triggered interrupts */

		cfg &= ~HPET_TN_LEVEL;
@@ -339,7 +339,7 @@ static void hpet_set_mode(enum clock_event_mode mode, 
		 * (See AMD-8111 HyperTransport I/O Hub Data Sheet,

		 * Publication # 24674)

		 */

		hpet_writel((unsigned long) delta, HPET_Tn_CMP(timer));

		hpet_writel((unsigned int) delta, HPET_Tn_CMP(timer));

		hpet_start_counter();

		hpet_print_config();

		break;
@@ -387,9 +387,9 @@ static int hpet_next_event(unsigned long delta, 
	 * what we wrote hit the chip before we compare it to the

	 * counter.

	 */

	WARN_ON_ONCE((u32)hpet_readl(HPET_Tn_CMP(timer)) != cnt);

	WARN_ON_ONCE(hpet_readl(HPET_Tn_CMP(timer)) != cnt);



	return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;

	return (s32)(hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;

}



static void hpet_legacy_set_mode(enum clock_event_mode mode,
@@ -415,7 +415,7 @@ static struct hpet_dev *hpet_devs; 
void hpet_msi_unmask(unsigned int irq)

{

	struct hpet_dev *hdev = get_irq_data(irq);

	unsigned long cfg;

	unsigned int cfg;



	/* unmask it */

	cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
@@ -425,7 +425,7 @@ void hpet_msi_unmask(unsigned int irq) 


void hpet_msi_mask(unsigned int irq)

{

	unsigned long cfg;

	unsigned int cfg;

	struct hpet_dev *hdev = get_irq_data(irq);



	/* mask it */
@@ -600,7 +600,7 @@ static void hpet_msi_capability_lookup(unsigned int start_timer) 


	for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) {

		struct hpet_dev *hdev = &hpet_devs[num_timers_used];

		unsigned long cfg = hpet_readl(HPET_Tn_CFG(i));

		unsigned int cfg = hpet_readl(HPET_Tn_CFG(i));



		/* Only consider HPET timer with MSI support */

		if (!(cfg & HPET_TN_FSB_CAP))
@@ -815,7 +815,7 @@ static int hpet_clocksource_register(void) 
 */

int __init hpet_enable(void)

{

	unsigned long id;

	unsigned int id;

	int i;



	if (!is_hpet_capable())
@@ -933,7 +933,7 @@ fs_initcall(hpet_late_init); 
void hpet_disable(void)

{

	if (is_hpet_capable()) {

		unsigned long cfg = hpet_readl(HPET_CFG);

		unsigned int cfg = hpet_readl(HPET_CFG);



		if (hpet_legacy_int_enabled) {

			cfg &= ~HPET_CFG_LEGACY;
@@ -973,8 +973,8 @@ static int hpet_prev_update_sec; 
static struct rtc_time hpet_alarm_time;

static unsigned long hpet_pie_count;

static u32 hpet_t1_cmp;

static unsigned long hpet_default_delta;

static unsigned long hpet_pie_delta;

static u32 hpet_default_delta;

static u32 hpet_pie_delta;

static unsigned long hpet_pie_limit;



static rtc_irq_handler irq_handler;
@@ -1025,7 +1025,8 @@ EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler); 
 */

int hpet_rtc_timer_init(void)

{

	unsigned long cfg, cnt, delta, flags;

	unsigned int cfg, cnt, delta;

	unsigned long flags;



	if (!is_hpet_enabled())

		return 0;
@@ -1035,7 +1036,7 @@ int hpet_rtc_timer_init(void) 


		clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;

		clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT;

		hpet_default_delta = (unsigned long) clc;

		hpet_default_delta = clc;

	}



	if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit)
@@ -1121,7 +1122,7 @@ int hpet_set_periodic_freq(unsigned long freq) 
		clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;

		do_div(clc, freq);

		clc >>= hpet_clockevent.shift;

		hpet_pie_delta = (unsigned long) clc;

		hpet_pie_delta = clc;

	}

	return 1;

}
@@ -1135,7 +1136,7 @@ EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq); 


static void hpet_rtc_timer_reinit(void)

{

	unsigned long cfg, delta;

	unsigned int cfg, delta;

	int lost_ints = -1;



	if (unlikely(!hpet_rtc_flags)) {