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MIPS: TXx9: micro optimization for clocksource and clock_event 

Use container structure for clocksource, clock_event_device and hold a
pointer to txx9_tmr_reg in it.

This saves a few instructions in clocksource and clock_event handlers.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Atsushi Nemoto 2009-04-24 00:10:36 +09:00 committed by Ralf Baechle
parent 605b7ef7b7
commit a43da03ca4
1 changed files with 43 additions and 24 deletions
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67
arch/mips/kernel/cevt-txx9.c
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@ -20,22 +20,29 @@
#define TIMER_CCD 0 /* 1/2 */
#define TIMER_CLK(imclk) ((imclk) / (2 << TIMER_CCD))
static struct txx9_tmr_reg __iomem *txx9_cs_tmrptr;
struct txx9_clocksource {
struct clocksource cs;
struct txx9_tmr_reg __iomem *tmrptr;
};
static cycle_t txx9_cs_read(struct clocksource *cs)
{
return __raw_readl(&txx9_cs_tmrptr->trr);
struct txx9_clocksource *txx9_cs =
container_of(cs, struct txx9_clocksource, cs);
return __raw_readl(&txx9_cs->tmrptr->trr);
}
/* Use 1 bit smaller width to use full bits in that width */
#define TXX9_CLOCKSOURCE_BITS (TXX9_TIMER_BITS - 1)
static struct clocksource txx9_clocksource = {
.name = "TXx9",
.rating = 200,
.read = txx9_cs_read,
.mask = CLOCKSOURCE_MASK(TXX9_CLOCKSOURCE_BITS),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
static struct txx9_clocksource txx9_clocksource = {
.cs = {
.name = "TXx9",
.rating = 200,
.read = txx9_cs_read,
.mask = CLOCKSOURCE_MASK(TXX9_CLOCKSOURCE_BITS),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
},
};
void __init txx9_clocksource_init(unsigned long baseaddr,
@ -43,8 +50,8 @@ void __init txx9_clocksource_init(unsigned long baseaddr,
{
struct txx9_tmr_reg __iomem *tmrptr;
clocksource_set_clock(&txx9_clocksource, TIMER_CLK(imbusclk));
clocksource_register(&txx9_clocksource);
clocksource_set_clock(&txx9_clocksource.cs, TIMER_CLK(imbusclk));
clocksource_register(&txx9_clocksource.cs);
tmrptr = ioremap(baseaddr, sizeof(struct txx9_tmr_reg));
__raw_writel(TCR_BASE, &tmrptr->tcr);
@ -53,10 +60,13 @@ void __init txx9_clocksource_init(unsigned long baseaddr,
__raw_writel(TXx9_TMITMR_TZCE, &tmrptr->itmr);
__raw_writel(1 << TXX9_CLOCKSOURCE_BITS, &tmrptr->cpra);
__raw_writel(TCR_BASE | TXx9_TMTCR_TCE, &tmrptr->tcr);
txx9_cs_tmrptr = tmrptr;
txx9_clocksource.tmrptr = tmrptr;
}
static struct txx9_tmr_reg __iomem *txx9_tmrptr;
struct txx9_clock_event_device {
struct clock_event_device cd;
struct txx9_tmr_reg __iomem *tmrptr;
};
static void txx9tmr_stop_and_clear(struct txx9_tmr_reg __iomem *tmrptr)
{
@ -69,7 +79,9 @@ static void txx9tmr_stop_and_clear(struct txx9_tmr_reg __iomem *tmrptr)
static void txx9tmr_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
struct txx9_tmr_reg __iomem *tmrptr = txx9_tmrptr;
struct txx9_clock_event_device *txx9_cd =
container_of(evt, struct txx9_clock_event_device, cd);
struct txx9_tmr_reg __iomem *tmrptr = txx9_cd->tmrptr;
txx9tmr_stop_and_clear(tmrptr);
switch (mode) {
@ -99,7 +111,9 @@ static void txx9tmr_set_mode(enum clock_event_mode mode,
static int txx9tmr_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
struct txx9_tmr_reg __iomem *tmrptr = txx9_tmrptr;
struct txx9_clock_event_device *txx9_cd =
container_of(evt, struct txx9_clock_event_device, cd);
struct txx9_tmr_reg __iomem *tmrptr = txx9_cd->tmrptr;
txx9tmr_stop_and_clear(tmrptr);
/* start timer */
@ -108,18 +122,22 @@ static int txx9tmr_set_next_event(unsigned long delta,
return 0;
}
static struct clock_event_device txx9tmr_clock_event_device = {
.name = "TXx9",
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.rating = 200,
.set_mode = txx9tmr_set_mode,
.set_next_event = txx9tmr_set_next_event,
static struct txx9_clock_event_device txx9_clock_event_device = {
.cd = {
.name = "TXx9",
.features = CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.rating = 200,
.set_mode = txx9tmr_set_mode,
.set_next_event = txx9tmr_set_next_event,
},
};
static irqreturn_t txx9tmr_interrupt(int irq, void *dev_id)
{
struct clock_event_device *cd = &txx9tmr_clock_event_device;
struct txx9_tmr_reg __iomem *tmrptr = txx9_tmrptr;
struct txx9_clock_event_device *txx9_cd = dev_id;
struct clock_event_device *cd = &txx9_cd->cd;
struct txx9_tmr_reg __iomem *tmrptr = txx9_cd->tmrptr;
__raw_writel(0, &tmrptr->tisr); /* ack interrupt */
cd->event_handler(cd);
@ -130,19 +148,20 @@ static struct irqaction txx9tmr_irq = {
.handler = txx9tmr_interrupt,
.flags = IRQF_DISABLED | IRQF_PERCPU,
.name = "txx9tmr",
.dev_id = &txx9_clock_event_device,
};
void __init txx9_clockevent_init(unsigned long baseaddr, int irq,
unsigned int imbusclk)
{
struct clock_event_device *cd = &txx9tmr_clock_event_device;
struct clock_event_device *cd = &txx9_clock_event_device.cd;
struct txx9_tmr_reg __iomem *tmrptr;
tmrptr = ioremap(baseaddr, sizeof(struct txx9_tmr_reg));
txx9tmr_stop_and_clear(tmrptr);
__raw_writel(TIMER_CCD, &tmrptr->ccdr);
__raw_writel(0, &tmrptr->itmr);
txx9_tmrptr = tmrptr;
txx9_clock_event_device.tmrptr = tmrptr;
clockevent_set_clock(cd, TIMER_CLK(imbusclk));
cd->max_delta_ns =