463 lines
16 KiB
C
463 lines
16 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2007-2009 ST-Ericsson AB
|
||
|
|
* License terms: GNU General Public License (GPL) version 2
|
||
|
|
* Timer COH 901 328, runs the OS timer interrupt.
|
||
|
|
* Author: Linus Walleij <linus.walleij@stericsson.com>
|
||
|
|
*/
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/time.h>
|
||
|
|
#include <linux/timex.h>
|
||
|
|
#include <linux/clockchips.h>
|
||
|
|
#include <linux/clocksource.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/clk.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
#include <linux/of_irq.h>
|
||
|
|
#include <linux/sched_clock.h>
|
||
|
|
|
||
|
|
/* Generic stuff */
|
||
|
|
#include <asm/mach/map.h>
|
||
|
|
#include <asm/mach/time.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* APP side special timer registers
|
||
|
|
* This timer contains four timers which can fire an interrupt each.
|
||
|
|
* OS (operating system) timer @ 32768 Hz
|
||
|
|
* DD (device driver) timer @ 1 kHz
|
||
|
|
* GP1 (general purpose 1) timer @ 1MHz
|
||
|
|
* GP2 (general purpose 2) timer @ 1MHz
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Reset OS Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_ROST (0x0000)
|
||
|
|
#define U300_TIMER_APP_ROST_TIMER_RESET (0x00000000)
|
||
|
|
/* Enable OS Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_EOST (0x0004)
|
||
|
|
#define U300_TIMER_APP_EOST_TIMER_ENABLE (0x00000000)
|
||
|
|
/* Disable OS Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_DOST (0x0008)
|
||
|
|
#define U300_TIMER_APP_DOST_TIMER_DISABLE (0x00000000)
|
||
|
|
/* OS Timer Mode Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_SOSTM (0x000c)
|
||
|
|
#define U300_TIMER_APP_SOSTM_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_SOSTM_MODE_ONE_SHOT (0x00000001)
|
||
|
|
/* OS Timer Status Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_OSTS (0x0010)
|
||
|
|
#define U300_TIMER_APP_OSTS_TIMER_STATE_MASK (0x0000000F)
|
||
|
|
#define U300_TIMER_APP_OSTS_TIMER_STATE_IDLE (0x00000001)
|
||
|
|
#define U300_TIMER_APP_OSTS_TIMER_STATE_ACTIVE (0x00000002)
|
||
|
|
#define U300_TIMER_APP_OSTS_ENABLE_IND (0x00000010)
|
||
|
|
#define U300_TIMER_APP_OSTS_MODE_MASK (0x00000020)
|
||
|
|
#define U300_TIMER_APP_OSTS_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_OSTS_MODE_ONE_SHOT (0x00000020)
|
||
|
|
#define U300_TIMER_APP_OSTS_IRQ_ENABLED_IND (0x00000040)
|
||
|
|
#define U300_TIMER_APP_OSTS_IRQ_PENDING_IND (0x00000080)
|
||
|
|
/* OS Timer Current Count Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_OSTCC (0x0014)
|
||
|
|
/* OS Timer Terminal Count Register 32bit (R/W) */
|
||
|
|
#define U300_TIMER_APP_OSTTC (0x0018)
|
||
|
|
/* OS Timer Interrupt Enable Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_OSTIE (0x001c)
|
||
|
|
#define U300_TIMER_APP_OSTIE_IRQ_DISABLE (0x00000000)
|
||
|
|
#define U300_TIMER_APP_OSTIE_IRQ_ENABLE (0x00000001)
|
||
|
|
/* OS Timer Interrupt Acknowledge Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_OSTIA (0x0020)
|
||
|
|
#define U300_TIMER_APP_OSTIA_IRQ_ACK (0x00000080)
|
||
|
|
|
||
|
|
/* Reset DD Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_RDDT (0x0040)
|
||
|
|
#define U300_TIMER_APP_RDDT_TIMER_RESET (0x00000000)
|
||
|
|
/* Enable DD Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_EDDT (0x0044)
|
||
|
|
#define U300_TIMER_APP_EDDT_TIMER_ENABLE (0x00000000)
|
||
|
|
/* Disable DD Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_DDDT (0x0048)
|
||
|
|
#define U300_TIMER_APP_DDDT_TIMER_DISABLE (0x00000000)
|
||
|
|
/* DD Timer Mode Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_SDDTM (0x004c)
|
||
|
|
#define U300_TIMER_APP_SDDTM_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_SDDTM_MODE_ONE_SHOT (0x00000001)
|
||
|
|
/* DD Timer Status Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_DDTS (0x0050)
|
||
|
|
#define U300_TIMER_APP_DDTS_TIMER_STATE_MASK (0x0000000F)
|
||
|
|
#define U300_TIMER_APP_DDTS_TIMER_STATE_IDLE (0x00000001)
|
||
|
|
#define U300_TIMER_APP_DDTS_TIMER_STATE_ACTIVE (0x00000002)
|
||
|
|
#define U300_TIMER_APP_DDTS_ENABLE_IND (0x00000010)
|
||
|
|
#define U300_TIMER_APP_DDTS_MODE_MASK (0x00000020)
|
||
|
|
#define U300_TIMER_APP_DDTS_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_DDTS_MODE_ONE_SHOT (0x00000020)
|
||
|
|
#define U300_TIMER_APP_DDTS_IRQ_ENABLED_IND (0x00000040)
|
||
|
|
#define U300_TIMER_APP_DDTS_IRQ_PENDING_IND (0x00000080)
|
||
|
|
/* DD Timer Current Count Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_DDTCC (0x0054)
|
||
|
|
/* DD Timer Terminal Count Register 32bit (R/W) */
|
||
|
|
#define U300_TIMER_APP_DDTTC (0x0058)
|
||
|
|
/* DD Timer Interrupt Enable Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_DDTIE (0x005c)
|
||
|
|
#define U300_TIMER_APP_DDTIE_IRQ_DISABLE (0x00000000)
|
||
|
|
#define U300_TIMER_APP_DDTIE_IRQ_ENABLE (0x00000001)
|
||
|
|
/* DD Timer Interrupt Acknowledge Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_DDTIA (0x0060)
|
||
|
|
#define U300_TIMER_APP_DDTIA_IRQ_ACK (0x00000080)
|
||
|
|
|
||
|
|
/* Reset GP1 Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_RGPT1 (0x0080)
|
||
|
|
#define U300_TIMER_APP_RGPT1_TIMER_RESET (0x00000000)
|
||
|
|
/* Enable GP1 Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_EGPT1 (0x0084)
|
||
|
|
#define U300_TIMER_APP_EGPT1_TIMER_ENABLE (0x00000000)
|
||
|
|
/* Disable GP1 Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_DGPT1 (0x0088)
|
||
|
|
#define U300_TIMER_APP_DGPT1_TIMER_DISABLE (0x00000000)
|
||
|
|
/* GP1 Timer Mode Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_SGPT1M (0x008c)
|
||
|
|
#define U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT (0x00000001)
|
||
|
|
/* GP1 Timer Status Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_GPT1S (0x0090)
|
||
|
|
#define U300_TIMER_APP_GPT1S_TIMER_STATE_MASK (0x0000000F)
|
||
|
|
#define U300_TIMER_APP_GPT1S_TIMER_STATE_IDLE (0x00000001)
|
||
|
|
#define U300_TIMER_APP_GPT1S_TIMER_STATE_ACTIVE (0x00000002)
|
||
|
|
#define U300_TIMER_APP_GPT1S_ENABLE_IND (0x00000010)
|
||
|
|
#define U300_TIMER_APP_GPT1S_MODE_MASK (0x00000020)
|
||
|
|
#define U300_TIMER_APP_GPT1S_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_GPT1S_MODE_ONE_SHOT (0x00000020)
|
||
|
|
#define U300_TIMER_APP_GPT1S_IRQ_ENABLED_IND (0x00000040)
|
||
|
|
#define U300_TIMER_APP_GPT1S_IRQ_PENDING_IND (0x00000080)
|
||
|
|
/* GP1 Timer Current Count Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_GPT1CC (0x0094)
|
||
|
|
/* GP1 Timer Terminal Count Register 32bit (R/W) */
|
||
|
|
#define U300_TIMER_APP_GPT1TC (0x0098)
|
||
|
|
/* GP1 Timer Interrupt Enable Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_GPT1IE (0x009c)
|
||
|
|
#define U300_TIMER_APP_GPT1IE_IRQ_DISABLE (0x00000000)
|
||
|
|
#define U300_TIMER_APP_GPT1IE_IRQ_ENABLE (0x00000001)
|
||
|
|
/* GP1 Timer Interrupt Acknowledge Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_GPT1IA (0x00a0)
|
||
|
|
#define U300_TIMER_APP_GPT1IA_IRQ_ACK (0x00000080)
|
||
|
|
|
||
|
|
/* Reset GP2 Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_RGPT2 (0x00c0)
|
||
|
|
#define U300_TIMER_APP_RGPT2_TIMER_RESET (0x00000000)
|
||
|
|
/* Enable GP2 Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_EGPT2 (0x00c4)
|
||
|
|
#define U300_TIMER_APP_EGPT2_TIMER_ENABLE (0x00000000)
|
||
|
|
/* Disable GP2 Timer 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_DGPT2 (0x00c8)
|
||
|
|
#define U300_TIMER_APP_DGPT2_TIMER_DISABLE (0x00000000)
|
||
|
|
/* GP2 Timer Mode Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_SGPT2M (0x00cc)
|
||
|
|
#define U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_SGPT2M_MODE_ONE_SHOT (0x00000001)
|
||
|
|
/* GP2 Timer Status Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_GPT2S (0x00d0)
|
||
|
|
#define U300_TIMER_APP_GPT2S_TIMER_STATE_MASK (0x0000000F)
|
||
|
|
#define U300_TIMER_APP_GPT2S_TIMER_STATE_IDLE (0x00000001)
|
||
|
|
#define U300_TIMER_APP_GPT2S_TIMER_STATE_ACTIVE (0x00000002)
|
||
|
|
#define U300_TIMER_APP_GPT2S_ENABLE_IND (0x00000010)
|
||
|
|
#define U300_TIMER_APP_GPT2S_MODE_MASK (0x00000020)
|
||
|
|
#define U300_TIMER_APP_GPT2S_MODE_CONTINUOUS (0x00000000)
|
||
|
|
#define U300_TIMER_APP_GPT2S_MODE_ONE_SHOT (0x00000020)
|
||
|
|
#define U300_TIMER_APP_GPT2S_IRQ_ENABLED_IND (0x00000040)
|
||
|
|
#define U300_TIMER_APP_GPT2S_IRQ_PENDING_IND (0x00000080)
|
||
|
|
/* GP2 Timer Current Count Register 32bit (R/-) */
|
||
|
|
#define U300_TIMER_APP_GPT2CC (0x00d4)
|
||
|
|
/* GP2 Timer Terminal Count Register 32bit (R/W) */
|
||
|
|
#define U300_TIMER_APP_GPT2TC (0x00d8)
|
||
|
|
/* GP2 Timer Interrupt Enable Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_GPT2IE (0x00dc)
|
||
|
|
#define U300_TIMER_APP_GPT2IE_IRQ_DISABLE (0x00000000)
|
||
|
|
#define U300_TIMER_APP_GPT2IE_IRQ_ENABLE (0x00000001)
|
||
|
|
/* GP2 Timer Interrupt Acknowledge Register 32bit (-/W) */
|
||
|
|
#define U300_TIMER_APP_GPT2IA (0x00e0)
|
||
|
|
#define U300_TIMER_APP_GPT2IA_IRQ_ACK (0x00000080)
|
||
|
|
|
||
|
|
/* Clock request control register - all four timers */
|
||
|
|
#define U300_TIMER_APP_CRC (0x100)
|
||
|
|
#define U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE (0x00000001)
|
||
|
|
|
||
|
|
static void __iomem *u300_timer_base;
|
||
|
|
|
||
|
|
struct u300_clockevent_data {
|
||
|
|
struct clock_event_device cevd;
|
||
|
|
unsigned ticks_per_jiffy;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int u300_shutdown(struct clock_event_device *evt)
|
||
|
|
{
|
||
|
|
/* Disable interrupts on GP1 */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Disable GP1 */
|
||
|
|
writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_DGPT1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If we have oneshot timer active, the oneshot scheduling function
|
||
|
|
* u300_set_next_event() is called immediately after.
|
||
|
|
*/
|
||
|
|
static int u300_set_oneshot(struct clock_event_device *evt)
|
||
|
|
{
|
||
|
|
/* Just return; here? */
|
||
|
|
/*
|
||
|
|
* The actual event will be programmed by the next event hook,
|
||
|
|
* so we just set a dummy value somewhere at the end of the
|
||
|
|
* universe here.
|
||
|
|
*/
|
||
|
|
/* Disable interrupts on GPT1 */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Disable GP1 while we're reprogramming it. */
|
||
|
|
writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_DGPT1);
|
||
|
|
/*
|
||
|
|
* Expire far in the future, u300_set_next_event() will be
|
||
|
|
* called soon...
|
||
|
|
*/
|
||
|
|
writel(0xFFFFFFFF, u300_timer_base + U300_TIMER_APP_GPT1TC);
|
||
|
|
/* We run one shot per tick here! */
|
||
|
|
writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT,
|
||
|
|
u300_timer_base + U300_TIMER_APP_SGPT1M);
|
||
|
|
/* Enable interrupts for this timer */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Enable timer */
|
||
|
|
writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_EGPT1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int u300_set_periodic(struct clock_event_device *evt)
|
||
|
|
{
|
||
|
|
struct u300_clockevent_data *cevdata =
|
||
|
|
container_of(evt, struct u300_clockevent_data, cevd);
|
||
|
|
|
||
|
|
/* Disable interrupts on GPT1 */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Disable GP1 while we're reprogramming it. */
|
||
|
|
writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_DGPT1);
|
||
|
|
/*
|
||
|
|
* Set the periodic mode to a certain number of ticks per
|
||
|
|
* jiffy.
|
||
|
|
*/
|
||
|
|
writel(cevdata->ticks_per_jiffy,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1TC);
|
||
|
|
/*
|
||
|
|
* Set continuous mode, so the timer keeps triggering
|
||
|
|
* interrupts.
|
||
|
|
*/
|
||
|
|
writel(U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS,
|
||
|
|
u300_timer_base + U300_TIMER_APP_SGPT1M);
|
||
|
|
/* Enable timer interrupts */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Then enable the OS timer again */
|
||
|
|
writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_EGPT1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The app timer in one shot mode obviously has to be reprogrammed
|
||
|
|
* in EXACTLY this sequence to work properly. Do NOT try to e.g. replace
|
||
|
|
* the interrupt disable + timer disable commands with a reset command,
|
||
|
|
* it will fail miserably. Apparently (and I found this the hard way)
|
||
|
|
* the timer is very sensitive to the instruction order, though you don't
|
||
|
|
* get that impression from the data sheet.
|
||
|
|
*/
|
||
|
|
static int u300_set_next_event(unsigned long cycles,
|
||
|
|
struct clock_event_device *evt)
|
||
|
|
|
||
|
|
{
|
||
|
|
/* Disable interrupts on GPT1 */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Disable GP1 while we're reprogramming it. */
|
||
|
|
writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_DGPT1);
|
||
|
|
/* Reset the General Purpose timer 1. */
|
||
|
|
writel(U300_TIMER_APP_RGPT1_TIMER_RESET,
|
||
|
|
u300_timer_base + U300_TIMER_APP_RGPT1);
|
||
|
|
/* IRQ in n * cycles */
|
||
|
|
writel(cycles, u300_timer_base + U300_TIMER_APP_GPT1TC);
|
||
|
|
/*
|
||
|
|
* We run one shot per tick here! (This is necessary to reconfigure,
|
||
|
|
* the timer will tilt if you don't!)
|
||
|
|
*/
|
||
|
|
writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT,
|
||
|
|
u300_timer_base + U300_TIMER_APP_SGPT1M);
|
||
|
|
/* Enable timer interrupts */
|
||
|
|
writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IE);
|
||
|
|
/* Then enable the OS timer again */
|
||
|
|
writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_EGPT1);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct u300_clockevent_data u300_clockevent_data = {
|
||
|
|
/* Use general purpose timer 1 as clock event */
|
||
|
|
.cevd = {
|
||
|
|
.name = "GPT1",
|
||
|
|
/* Reasonably fast and accurate clock event */
|
||
|
|
.rating = 300,
|
||
|
|
.features = CLOCK_EVT_FEAT_PERIODIC |
|
||
|
|
CLOCK_EVT_FEAT_ONESHOT,
|
||
|
|
.set_next_event = u300_set_next_event,
|
||
|
|
.set_state_shutdown = u300_shutdown,
|
||
|
|
.set_state_periodic = u300_set_periodic,
|
||
|
|
.set_state_oneshot = u300_set_oneshot,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Clock event timer interrupt handler */
|
||
|
|
static irqreturn_t u300_timer_interrupt(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
struct clock_event_device *evt = &u300_clockevent_data.cevd;
|
||
|
|
/* ACK/Clear timer IRQ for the APP GPT1 Timer */
|
||
|
|
|
||
|
|
writel(U300_TIMER_APP_GPT1IA_IRQ_ACK,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT1IA);
|
||
|
|
evt->event_handler(evt);
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct irqaction u300_timer_irq = {
|
||
|
|
.name = "U300 Timer Tick",
|
||
|
|
.flags = IRQF_TIMER | IRQF_IRQPOLL,
|
||
|
|
.handler = u300_timer_interrupt,
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Override the global weak sched_clock symbol with this
|
||
|
|
* local implementation which uses the clocksource to get some
|
||
|
|
* better resolution when scheduling the kernel. We accept that
|
||
|
|
* this wraps around for now, since it is just a relative time
|
||
|
|
* stamp. (Inspired by OMAP implementation.)
|
||
|
|
*/
|
||
|
|
|
||
|
|
static u64 notrace u300_read_sched_clock(void)
|
||
|
|
{
|
||
|
|
return readl(u300_timer_base + U300_TIMER_APP_GPT2CC);
|
||
|
|
}
|
||
|
|
|
||
|
|
static unsigned long u300_read_current_timer(void)
|
||
|
|
{
|
||
|
|
return readl(u300_timer_base + U300_TIMER_APP_GPT2CC);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct delay_timer u300_delay_timer;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This sets up the system timers, clock source and clock event.
|
||
|
|
*/
|
||
|
|
static int __init u300_timer_init_of(struct device_node *np)
|
||
|
|
{
|
||
|
|
unsigned int irq;
|
||
|
|
struct clk *clk;
|
||
|
|
unsigned long rate;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
u300_timer_base = of_iomap(np, 0);
|
||
|
|
if (!u300_timer_base) {
|
||
|
|
pr_err("could not ioremap system timer\n");
|
||
|
|
return -ENXIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get the IRQ for the GP1 timer */
|
||
|
|
irq = irq_of_parse_and_map(np, 2);
|
||
|
|
if (!irq) {
|
||
|
|
pr_err("no IRQ for system timer\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
pr_info("U300 GP1 timer @ base: %p, IRQ: %u\n", u300_timer_base, irq);
|
||
|
|
|
||
|
|
/* Clock the interrupt controller */
|
||
|
|
clk = of_clk_get(np, 0);
|
||
|
|
if (IS_ERR(clk))
|
||
|
|
return PTR_ERR(clk);
|
||
|
|
|
||
|
|
ret = clk_prepare_enable(clk);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
rate = clk_get_rate(clk);
|
||
|
|
|
||
|
|
u300_clockevent_data.ticks_per_jiffy = DIV_ROUND_CLOSEST(rate, HZ);
|
||
|
|
|
||
|
|
sched_clock_register(u300_read_sched_clock, 32, rate);
|
||
|
|
|
||
|
|
u300_delay_timer.read_current_timer = &u300_read_current_timer;
|
||
|
|
u300_delay_timer.freq = rate;
|
||
|
|
register_current_timer_delay(&u300_delay_timer);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Disable the "OS" and "DD" timers - these are designed for Symbian!
|
||
|
|
* Example usage in cnh1601578 cpu subsystem pd_timer_app.c
|
||
|
|
*/
|
||
|
|
writel(U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_CRC);
|
||
|
|
writel(U300_TIMER_APP_ROST_TIMER_RESET,
|
||
|
|
u300_timer_base + U300_TIMER_APP_ROST);
|
||
|
|
writel(U300_TIMER_APP_DOST_TIMER_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_DOST);
|
||
|
|
writel(U300_TIMER_APP_RDDT_TIMER_RESET,
|
||
|
|
u300_timer_base + U300_TIMER_APP_RDDT);
|
||
|
|
writel(U300_TIMER_APP_DDDT_TIMER_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_DDDT);
|
||
|
|
|
||
|
|
/* Reset the General Purpose timer 1. */
|
||
|
|
writel(U300_TIMER_APP_RGPT1_TIMER_RESET,
|
||
|
|
u300_timer_base + U300_TIMER_APP_RGPT1);
|
||
|
|
|
||
|
|
/* Set up the IRQ handler */
|
||
|
|
ret = setup_irq(irq, &u300_timer_irq);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* Reset the General Purpose timer 2 */
|
||
|
|
writel(U300_TIMER_APP_RGPT2_TIMER_RESET,
|
||
|
|
u300_timer_base + U300_TIMER_APP_RGPT2);
|
||
|
|
/* Set this timer to run around forever */
|
||
|
|
writel(0xFFFFFFFFU, u300_timer_base + U300_TIMER_APP_GPT2TC);
|
||
|
|
/* Set continuous mode so it wraps around */
|
||
|
|
writel(U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS,
|
||
|
|
u300_timer_base + U300_TIMER_APP_SGPT2M);
|
||
|
|
/* Disable timer interrupts */
|
||
|
|
writel(U300_TIMER_APP_GPT2IE_IRQ_DISABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_GPT2IE);
|
||
|
|
/* Then enable the GP2 timer to use as a free running us counter */
|
||
|
|
writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE,
|
||
|
|
u300_timer_base + U300_TIMER_APP_EGPT2);
|
||
|
|
|
||
|
|
/* Use general purpose timer 2 as clock source */
|
||
|
|
ret = clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC,
|
||
|
|
"GPT2", rate, 300, 32, clocksource_mmio_readl_up);
|
||
|
|
if (ret) {
|
||
|
|
pr_err("timer: failed to initialize U300 clock source\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Configure and register the clockevent */
|
||
|
|
clockevents_config_and_register(&u300_clockevent_data.cevd, rate,
|
||
|
|
1, 0xffffffff);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TODO: init and register the rest of the timers too, they can be
|
||
|
|
* used by hrtimers!
|
||
|
|
*/
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
TIMER_OF_DECLARE(u300_timer, "stericsson,u300-apptimer",
|
||
|
|
u300_timer_init_of);
|