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exynos4210_mct.c
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exynos4210_mct.c
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/*
* Samsung exynos4210 Multi Core timer
*
* Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd.
* All rights reserved.
*
* Evgeny Voevodin <e.voevodin@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Global Timer:
*
* Consists of two timers. First represents Free Running Counter and second
* is used to measure interval from FRC to nearest comparator.
*
* 0 UINT64_MAX
* | timer0 |
* | <-------------------------------------------------------------- |
* | --------------------------------------------frc---------------> |
* |______________________________________________|__________________|
* CMP0 CMP1 CMP2 | CMP3
* __| |_
* | timer1 |
* | -------------> |
* frc CMPx
*
* Problem: when implementing global timer as is, overflow arises.
* next_time = cur_time + period * count;
* period and count are 64 bits width.
* Lets arm timer for MCT_GT_COUNTER_STEP count and update internal G_CNT
* register during each event.
*
* Problem: both timers need to be implemented using MCT_XT_COUNTER_STEP because
* local timer contains two counters: TCNT and ICNT. TCNT == 0 -> ICNT--.
* IRQ is generated when ICNT riches zero. Implementation where TCNT == 0
* generates IRQs suffers from too frequently events. Better to have one
* uint64_t counter equal to TCNT*ICNT and arm ptimer.c for a minimum(TCNT*ICNT,
* MCT_GT_COUNTER_STEP); (yes, if target tunes ICNT * TCNT to be too low values,
* there is no way to avoid frequently events).
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/timer.h"
#include "qemu/module.h"
#include "hw/ptimer.h"
#include "hw/arm/exynos4210.h"
#include "hw/irq.h"
#include "qom/object.h"
//#define DEBUG_MCT
#ifdef DEBUG_MCT
#define DPRINTF(fmt, ...) \
do { fprintf(stdout, "MCT: [%24s:%5d] " fmt, __func__, __LINE__, \
## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#define MCT_CFG 0x000
#define G_CNT_L 0x100
#define G_CNT_U 0x104
#define G_CNT_WSTAT 0x110
#define G_COMP0_L 0x200
#define G_COMP0_U 0x204
#define G_COMP0_ADD_INCR 0x208
#define G_COMP1_L 0x210
#define G_COMP1_U 0x214
#define G_COMP1_ADD_INCR 0x218
#define G_COMP2_L 0x220
#define G_COMP2_U 0x224
#define G_COMP2_ADD_INCR 0x228
#define G_COMP3_L 0x230
#define G_COMP3_U 0x234
#define G_COMP3_ADD_INCR 0x238
#define G_TCON 0x240
#define G_INT_CSTAT 0x244
#define G_INT_ENB 0x248
#define G_WSTAT 0x24C
#define L0_TCNTB 0x300
#define L0_TCNTO 0x304
#define L0_ICNTB 0x308
#define L0_ICNTO 0x30C
#define L0_FRCNTB 0x310
#define L0_FRCNTO 0x314
#define L0_TCON 0x320
#define L0_INT_CSTAT 0x330
#define L0_INT_ENB 0x334
#define L0_WSTAT 0x340
#define L1_TCNTB 0x400
#define L1_TCNTO 0x404
#define L1_ICNTB 0x408
#define L1_ICNTO 0x40C
#define L1_FRCNTB 0x410
#define L1_FRCNTO 0x414
#define L1_TCON 0x420
#define L1_INT_CSTAT 0x430
#define L1_INT_ENB 0x434
#define L1_WSTAT 0x440
#define MCT_CFG_GET_PRESCALER(x) ((x) & 0xFF)
#define MCT_CFG_GET_DIVIDER(x) (1 << ((x) >> 8 & 7))
#define GET_G_COMP_IDX(offset) (((offset) - G_COMP0_L) / 0x10)
#define GET_G_COMP_ADD_INCR_IDX(offset) (((offset) - G_COMP0_ADD_INCR) / 0x10)
#define G_COMP_L(x) (G_COMP0_L + (x) * 0x10)
#define G_COMP_U(x) (G_COMP0_U + (x) * 0x10)
#define G_COMP_ADD_INCR(x) (G_COMP0_ADD_INCR + (x) * 0x10)
/* MCT bits */
#define G_TCON_COMP_ENABLE(x) (1 << 2 * (x))
#define G_TCON_AUTO_ICREMENT(x) (1 << (2 * (x) + 1))
#define G_TCON_TIMER_ENABLE (1 << 8)
#define G_INT_ENABLE(x) (1 << (x))
#define G_INT_CSTAT_COMP(x) (1 << (x))
#define G_CNT_WSTAT_L 1
#define G_CNT_WSTAT_U 2
#define G_WSTAT_COMP_L(x) (1 << 4 * (x))
#define G_WSTAT_COMP_U(x) (1 << ((4 * (x)) + 1))
#define G_WSTAT_COMP_ADDINCR(x) (1 << ((4 * (x)) + 2))
#define G_WSTAT_TCON_WRITE (1 << 16)
#define GET_L_TIMER_IDX(offset) ((((offset) & 0xF00) - L0_TCNTB) / 0x100)
#define GET_L_TIMER_CNT_REG_IDX(offset, lt_i) \
(((offset) - (L0_TCNTB + 0x100 * (lt_i))) >> 2)
#define L_ICNTB_MANUAL_UPDATE (1 << 31)
#define L_TCON_TICK_START (1)
#define L_TCON_INT_START (1 << 1)
#define L_TCON_INTERVAL_MODE (1 << 2)
#define L_TCON_FRC_START (1 << 3)
#define L_INT_CSTAT_INTCNT (1 << 0)
#define L_INT_CSTAT_FRCCNT (1 << 1)
#define L_INT_INTENB_ICNTEIE (1 << 0)
#define L_INT_INTENB_FRCEIE (1 << 1)
#define L_WSTAT_TCNTB_WRITE (1 << 0)
#define L_WSTAT_ICNTB_WRITE (1 << 1)
#define L_WSTAT_FRCCNTB_WRITE (1 << 2)
#define L_WSTAT_TCON_WRITE (1 << 3)
enum LocalTimerRegCntIndexes {
L_REG_CNT_TCNTB,
L_REG_CNT_TCNTO,
L_REG_CNT_ICNTB,
L_REG_CNT_ICNTO,
L_REG_CNT_FRCCNTB,
L_REG_CNT_FRCCNTO,
L_REG_CNT_AMOUNT
};
#define MCT_SFR_SIZE 0x444
#define MCT_GT_CMP_NUM 4
#define MCT_GT_COUNTER_STEP 0x100000000ULL
#define MCT_LT_COUNTER_STEP 0x100000000ULL
#define MCT_LT_CNT_LOW_LIMIT 0x100
/* global timer */
typedef struct {
qemu_irq irq[MCT_GT_CMP_NUM];
struct gregs {
uint64_t cnt;
uint32_t cnt_wstat;
uint32_t tcon;
uint32_t int_cstat;
uint32_t int_enb;
uint32_t wstat;
uint64_t comp[MCT_GT_CMP_NUM];
uint32_t comp_add_incr[MCT_GT_CMP_NUM];
} reg;
uint64_t count; /* Value FRC was armed with */
int32_t curr_comp; /* Current comparator FRC is running to */
ptimer_state *ptimer_frc; /* FRC timer */
} Exynos4210MCTGT;
/* local timer */
typedef struct {
int id; /* timer id */
qemu_irq irq; /* local timer irq */
struct tick_timer {
uint32_t cnt_run; /* cnt timer is running */
uint32_t int_run; /* int timer is running */
uint32_t last_icnto;
uint32_t last_tcnto;
uint32_t tcntb; /* initial value for TCNTB */
uint32_t icntb; /* initial value for ICNTB */
/* for step mode */
uint64_t distance; /* distance to count to the next event */
uint64_t progress; /* progress when counting by steps */
uint64_t count; /* count to arm timer with */
ptimer_state *ptimer_tick; /* timer for tick counter */
} tick_timer;
/* use ptimer.c to represent count down timer */
ptimer_state *ptimer_frc; /* timer for free running counter */
/* registers */
struct lregs {
uint32_t cnt[L_REG_CNT_AMOUNT];
uint32_t tcon;
uint32_t int_cstat;
uint32_t int_enb;
uint32_t wstat;
} reg;
} Exynos4210MCTLT;
#define TYPE_EXYNOS4210_MCT "exynos4210.mct"
OBJECT_DECLARE_SIMPLE_TYPE(Exynos4210MCTState, EXYNOS4210_MCT)
struct Exynos4210MCTState {
SysBusDevice parent_obj;
MemoryRegion iomem;
/* Registers */
uint32_t reg_mct_cfg;
Exynos4210MCTLT l_timer[2];
Exynos4210MCTGT g_timer;
uint32_t freq; /* all timers tick frequency, TCLK */
};
/*** VMState ***/
static const VMStateDescription vmstate_tick_timer = {
.name = "exynos4210.mct.tick_timer",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(cnt_run, struct tick_timer),
VMSTATE_UINT32(int_run, struct tick_timer),
VMSTATE_UINT32(last_icnto, struct tick_timer),
VMSTATE_UINT32(last_tcnto, struct tick_timer),
VMSTATE_UINT32(tcntb, struct tick_timer),
VMSTATE_UINT32(icntb, struct tick_timer),
VMSTATE_UINT64(distance, struct tick_timer),
VMSTATE_UINT64(progress, struct tick_timer),
VMSTATE_UINT64(count, struct tick_timer),
VMSTATE_PTIMER(ptimer_tick, struct tick_timer),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_lregs = {
.name = "exynos4210.mct.lregs",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(cnt, struct lregs, L_REG_CNT_AMOUNT),
VMSTATE_UINT32(tcon, struct lregs),
VMSTATE_UINT32(int_cstat, struct lregs),
VMSTATE_UINT32(int_enb, struct lregs),
VMSTATE_UINT32(wstat, struct lregs),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_exynos4210_mct_lt = {
.name = "exynos4210.mct.lt",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_INT32(id, Exynos4210MCTLT),
VMSTATE_STRUCT(tick_timer, Exynos4210MCTLT, 0,
vmstate_tick_timer,
struct tick_timer),
VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTLT),
VMSTATE_STRUCT(reg, Exynos4210MCTLT, 0,
vmstate_lregs,
struct lregs),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_gregs = {
.name = "exynos4210.mct.lregs",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT64(cnt, struct gregs),
VMSTATE_UINT32(cnt_wstat, struct gregs),
VMSTATE_UINT32(tcon, struct gregs),
VMSTATE_UINT32(int_cstat, struct gregs),
VMSTATE_UINT32(int_enb, struct gregs),
VMSTATE_UINT32(wstat, struct gregs),
VMSTATE_UINT64_ARRAY(comp, struct gregs, MCT_GT_CMP_NUM),
VMSTATE_UINT32_ARRAY(comp_add_incr, struct gregs,
MCT_GT_CMP_NUM),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_exynos4210_mct_gt = {
.name = "exynos4210.mct.lt",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_STRUCT(reg, Exynos4210MCTGT, 0, vmstate_gregs,
struct gregs),
VMSTATE_UINT64(count, Exynos4210MCTGT),
VMSTATE_INT32(curr_comp, Exynos4210MCTGT),
VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTGT),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_exynos4210_mct_state = {
.name = "exynos4210.mct",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(reg_mct_cfg, Exynos4210MCTState),
VMSTATE_STRUCT_ARRAY(l_timer, Exynos4210MCTState, 2, 0,
vmstate_exynos4210_mct_lt, Exynos4210MCTLT),
VMSTATE_STRUCT(g_timer, Exynos4210MCTState, 0,
vmstate_exynos4210_mct_gt, Exynos4210MCTGT),
VMSTATE_UINT32(freq, Exynos4210MCTState),
VMSTATE_END_OF_LIST()
}
};
static void exynos4210_mct_update_freq(Exynos4210MCTState *s);
/*
* Set counter of FRC global timer.
* Must be called within exynos4210_gfrc_tx_begin/commit block.
*/
static void exynos4210_gfrc_set_count(Exynos4210MCTGT *s, uint64_t count)
{
s->count = count;
DPRINTF("global timer frc set count 0x%llx\n", count);
ptimer_set_count(s->ptimer_frc, count);
}
/*
* Get counter of FRC global timer.
*/
static uint64_t exynos4210_gfrc_get_count(Exynos4210MCTGT *s)
{
uint64_t count = 0;
count = ptimer_get_count(s->ptimer_frc);
count = s->count - count;
return s->reg.cnt + count;
}
/*
* Stop global FRC timer
* Must be called within exynos4210_gfrc_tx_begin/commit block.
*/
static void exynos4210_gfrc_stop(Exynos4210MCTGT *s)
{
DPRINTF("global timer frc stop\n");
ptimer_stop(s->ptimer_frc);
}
/*
* Start global FRC timer
* Must be called within exynos4210_gfrc_tx_begin/commit block.
*/
static void exynos4210_gfrc_start(Exynos4210MCTGT *s)
{
DPRINTF("global timer frc start\n");
ptimer_run(s->ptimer_frc, 1);
}
/*
* Start ptimer transaction for global FRC timer; this is just for
* consistency with the way we wrap operations like stop and run.
*/
static void exynos4210_gfrc_tx_begin(Exynos4210MCTGT *s)
{
ptimer_transaction_begin(s->ptimer_frc);
}
/* Commit ptimer transaction for global FRC timer. */
static void exynos4210_gfrc_tx_commit(Exynos4210MCTGT *s)
{
ptimer_transaction_commit(s->ptimer_frc);
}
/*
* Find next nearest Comparator. If current Comparator value equals to other
* Comparator value, skip them both
*/
static int32_t exynos4210_gcomp_find(Exynos4210MCTState *s)
{
int res;
int i;
int enabled;
uint64_t min;
int min_comp_i;
uint64_t gfrc;
uint64_t distance;
uint64_t distance_min;
int comp_i;
/* get gfrc count */
gfrc = exynos4210_gfrc_get_count(&s->g_timer);
min = UINT64_MAX;
distance_min = UINT64_MAX;
comp_i = MCT_GT_CMP_NUM;
min_comp_i = MCT_GT_CMP_NUM;
enabled = 0;
/* lookup for nearest comparator */
for (i = 0; i < MCT_GT_CMP_NUM; i++) {
if (s->g_timer.reg.tcon & G_TCON_COMP_ENABLE(i)) {
enabled = 1;
if (s->g_timer.reg.comp[i] > gfrc) {
/* Comparator is upper then FRC */
distance = s->g_timer.reg.comp[i] - gfrc;
if (distance <= distance_min) {
distance_min = distance;
comp_i = i;
}
} else {
/* Comparator is below FRC, find the smallest */
if (s->g_timer.reg.comp[i] <= min) {
min = s->g_timer.reg.comp[i];
min_comp_i = i;
}
}
}
}
if (!enabled) {
/* All Comparators disabled */
res = -1;
} else if (comp_i < MCT_GT_CMP_NUM) {
/* Found upper Comparator */
res = comp_i;
} else {
/* All Comparators are below or equal to FRC */
res = min_comp_i;
}
DPRINTF("found comparator %d: comp 0x%llx distance 0x%llx, gfrc 0x%llx\n",
res,
s->g_timer.reg.comp[res],
distance_min,
gfrc);
return res;
}
/*
* Get distance to nearest Comparator
*/
static uint64_t exynos4210_gcomp_get_distance(Exynos4210MCTState *s, int32_t id)
{
if (id == -1) {
/* no enabled Comparators, choose max distance */
return MCT_GT_COUNTER_STEP;
}
if (s->g_timer.reg.comp[id] - s->g_timer.reg.cnt < MCT_GT_COUNTER_STEP) {
return s->g_timer.reg.comp[id] - s->g_timer.reg.cnt;
} else {
return MCT_GT_COUNTER_STEP;
}
}
/*
* Restart global FRC timer
* Must be called within exynos4210_gfrc_tx_begin/commit block.
*/
static void exynos4210_gfrc_restart(Exynos4210MCTState *s)
{
uint64_t distance;
exynos4210_gfrc_stop(&s->g_timer);
s->g_timer.curr_comp = exynos4210_gcomp_find(s);
distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
if (distance > MCT_GT_COUNTER_STEP || !distance) {
distance = MCT_GT_COUNTER_STEP;
}
exynos4210_gfrc_set_count(&s->g_timer, distance);
exynos4210_gfrc_start(&s->g_timer);
}
/*
* Raise global timer CMP IRQ
*/
static void exynos4210_gcomp_raise_irq(void *opaque, uint32_t id)
{
Exynos4210MCTGT *s = opaque;
/* If CSTAT is pending and IRQ is enabled */
if ((s->reg.int_cstat & G_INT_CSTAT_COMP(id)) &&
(s->reg.int_enb & G_INT_ENABLE(id))) {
DPRINTF("gcmp timer[%u] IRQ\n", id);
qemu_irq_raise(s->irq[id]);
}
}
/*
* Lower global timer CMP IRQ
*/
static void exynos4210_gcomp_lower_irq(void *opaque, uint32_t id)
{
Exynos4210MCTGT *s = opaque;
qemu_irq_lower(s->irq[id]);
}
/*
* Global timer FRC event handler.
* Each event occurs when internal counter reaches counter + MCT_GT_COUNTER_STEP
* Every time we arm global FRC timer to count for MCT_GT_COUNTER_STEP value
*/
static void exynos4210_gfrc_event(void *opaque)
{
Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
int i;
uint64_t distance;
DPRINTF("\n");
s->g_timer.reg.cnt += s->g_timer.count;
/* Process all comparators */
for (i = 0; i < MCT_GT_CMP_NUM; i++) {
if (s->g_timer.reg.cnt == s->g_timer.reg.comp[i]) {
/* reached nearest comparator */
s->g_timer.reg.int_cstat |= G_INT_CSTAT_COMP(i);
/* Auto increment */
if (s->g_timer.reg.tcon & G_TCON_AUTO_ICREMENT(i)) {
s->g_timer.reg.comp[i] += s->g_timer.reg.comp_add_incr[i];
}
/* IRQ */
exynos4210_gcomp_raise_irq(&s->g_timer, i);
}
}
/* Reload FRC to reach nearest comparator */
s->g_timer.curr_comp = exynos4210_gcomp_find(s);
distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
if (distance > MCT_GT_COUNTER_STEP || !distance) {
distance = MCT_GT_COUNTER_STEP;
}
exynos4210_gfrc_set_count(&s->g_timer, distance);
exynos4210_gfrc_start(&s->g_timer);
}
/*
* Get counter of FRC local timer.
*/
static uint64_t exynos4210_lfrc_get_count(Exynos4210MCTLT *s)
{
return ptimer_get_count(s->ptimer_frc);
}
/*
* Set counter of FRC local timer.
* Must be called from within exynos4210_lfrc_tx_begin/commit block.
*/
static void exynos4210_lfrc_update_count(Exynos4210MCTLT *s)
{
if (!s->reg.cnt[L_REG_CNT_FRCCNTB]) {
ptimer_set_count(s->ptimer_frc, MCT_LT_COUNTER_STEP);
} else {
ptimer_set_count(s->ptimer_frc, s->reg.cnt[L_REG_CNT_FRCCNTB]);
}
}
/*
* Start local FRC timer
* Must be called from within exynos4210_lfrc_tx_begin/commit block.
*/
static void exynos4210_lfrc_start(Exynos4210MCTLT *s)
{
ptimer_run(s->ptimer_frc, 1);
}
/*
* Stop local FRC timer
* Must be called from within exynos4210_lfrc_tx_begin/commit block.
*/
static void exynos4210_lfrc_stop(Exynos4210MCTLT *s)
{
ptimer_stop(s->ptimer_frc);
}
/* Start ptimer transaction for local FRC timer */
static void exynos4210_lfrc_tx_begin(Exynos4210MCTLT *s)
{
ptimer_transaction_begin(s->ptimer_frc);
}
/* Commit ptimer transaction for local FRC timer */
static void exynos4210_lfrc_tx_commit(Exynos4210MCTLT *s)
{
ptimer_transaction_commit(s->ptimer_frc);
}
/*
* Local timer free running counter tick handler
*/
static void exynos4210_lfrc_event(void *opaque)
{
Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
/* local frc expired */
DPRINTF("\n");
s->reg.int_cstat |= L_INT_CSTAT_FRCCNT;
/* update frc counter */
exynos4210_lfrc_update_count(s);
/* raise irq */
if (s->reg.int_enb & L_INT_INTENB_FRCEIE) {
qemu_irq_raise(s->irq);
}
/* we reached here, this means that timer is enabled */
exynos4210_lfrc_start(s);
}
static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s);
static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s);
static void exynos4210_ltick_recalc_count(struct tick_timer *s);
/*
* Action on enabling local tick int timer
*/
static void exynos4210_ltick_int_start(struct tick_timer *s)
{
if (!s->int_run) {
s->int_run = 1;
}
}
/*
* Action on disabling local tick int timer
*/
static void exynos4210_ltick_int_stop(struct tick_timer *s)
{
if (s->int_run) {
s->last_icnto = exynos4210_ltick_int_get_cnto(s);
s->int_run = 0;
}
}
/*
* Get count for INT timer
*/
static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s)
{
uint32_t icnto;
uint64_t remain;
uint64_t count;
uint64_t counted;
uint64_t cur_progress;
count = ptimer_get_count(s->ptimer_tick);
if (count) {
/* timer is still counting, called not from event */
counted = s->count - ptimer_get_count(s->ptimer_tick);
cur_progress = s->progress + counted;
} else {
/* timer expired earlier */
cur_progress = s->progress;
}
remain = s->distance - cur_progress;
if (!s->int_run) {
/* INT is stopped. */
icnto = s->last_icnto;
} else {
/* Both are counting */
icnto = remain / s->tcntb;
}
return icnto;
}
/*
* Start local tick cnt timer.
* Must be called within exynos4210_ltick_tx_begin/commit block.
*/
static void exynos4210_ltick_cnt_start(struct tick_timer *s)
{
if (!s->cnt_run) {
exynos4210_ltick_recalc_count(s);
ptimer_set_count(s->ptimer_tick, s->count);
ptimer_run(s->ptimer_tick, 1);
s->cnt_run = 1;
}
}
/*
* Stop local tick cnt timer.
* Must be called within exynos4210_ltick_tx_begin/commit block.
*/
static void exynos4210_ltick_cnt_stop(struct tick_timer *s)
{
if (s->cnt_run) {
s->last_tcnto = exynos4210_ltick_cnt_get_cnto(s);
if (s->int_run) {
exynos4210_ltick_int_stop(s);
}
ptimer_stop(s->ptimer_tick);
s->cnt_run = 0;
}
}
/* Start ptimer transaction for local tick timer */
static void exynos4210_ltick_tx_begin(struct tick_timer *s)
{
ptimer_transaction_begin(s->ptimer_tick);
}
/* Commit ptimer transaction for local tick timer */
static void exynos4210_ltick_tx_commit(struct tick_timer *s)
{
ptimer_transaction_commit(s->ptimer_tick);
}
/*
* Get counter for CNT timer
*/
static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s)
{
uint32_t tcnto;
uint32_t icnto;
uint64_t remain;
uint64_t counted;
uint64_t count;
uint64_t cur_progress;
count = ptimer_get_count(s->ptimer_tick);
if (count) {
/* timer is still counting, called not from event */
counted = s->count - ptimer_get_count(s->ptimer_tick);
cur_progress = s->progress + counted;
} else {
/* timer expired earlier */
cur_progress = s->progress;
}
remain = s->distance - cur_progress;
if (!s->cnt_run) {
/* Both are stopped. */
tcnto = s->last_tcnto;
} else if (!s->int_run) {
/* INT counter is stopped, progress is by CNT timer */
tcnto = remain % s->tcntb;
} else {
/* Both are counting */
icnto = remain / s->tcntb;
if (icnto) {
tcnto = remain % (icnto * s->tcntb);
} else {
tcnto = remain % s->tcntb;
}
}
return tcnto;
}
/*
* Set new values of counters for CNT and INT timers
* Must be called within exynos4210_ltick_tx_begin/commit block.
*/
static void exynos4210_ltick_set_cntb(struct tick_timer *s, uint32_t new_cnt,
uint32_t new_int)
{
uint32_t cnt_stopped = 0;
uint32_t int_stopped = 0;
if (s->cnt_run) {
exynos4210_ltick_cnt_stop(s);
cnt_stopped = 1;
}
if (s->int_run) {
exynos4210_ltick_int_stop(s);
int_stopped = 1;
}
s->tcntb = new_cnt + 1;
s->icntb = new_int + 1;
if (cnt_stopped) {
exynos4210_ltick_cnt_start(s);
}
if (int_stopped) {
exynos4210_ltick_int_start(s);
}
}
/*
* Calculate new counter value for tick timer
*/
static void exynos4210_ltick_recalc_count(struct tick_timer *s)
{
uint64_t to_count;
if ((s->cnt_run && s->last_tcnto) || (s->int_run && s->last_icnto)) {
/*
* one or both timers run and not counted to the end;
* distance is not passed, recalculate with last_tcnto * last_icnto
*/
if (s->last_tcnto) {
to_count = (uint64_t)s->last_tcnto * s->last_icnto;
} else {
to_count = s->last_icnto;
}
} else {
/* distance is passed, recalculate with tcnto * icnto */
if (s->icntb) {
s->distance = (uint64_t)s->tcntb * s->icntb;
} else {
s->distance = s->tcntb;
}
to_count = s->distance;
s->progress = 0;
}
if (to_count > MCT_LT_COUNTER_STEP) {
/* count by step */
s->count = MCT_LT_COUNTER_STEP;
} else {
s->count = to_count;
}
}
/*
* Initialize tick_timer
*/
static void exynos4210_ltick_timer_init(struct tick_timer *s)
{
exynos4210_ltick_int_stop(s);
exynos4210_ltick_tx_begin(s);
exynos4210_ltick_cnt_stop(s);
exynos4210_ltick_tx_commit(s);
s->count = 0;
s->distance = 0;
s->progress = 0;
s->icntb = 0;
s->tcntb = 0;
}
/*
* tick_timer event.
* Raises when abstract tick_timer expires.
*/
static void exynos4210_ltick_timer_event(struct tick_timer *s)
{
s->progress += s->count;
}
/*
* Local timer tick counter handler.
* Don't use reloaded timers. If timer counter = zero
* then handler called but after handler finished no
* timer reload occurs.
*/
static void exynos4210_ltick_event(void *opaque)
{
Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
uint32_t tcnto;
uint32_t icnto;
#ifdef DEBUG_MCT
static uint64_t time1[2] = {0};
static uint64_t time2[2] = {0};
#endif
/* Call tick_timer event handler, it will update its tcntb and icntb. */
exynos4210_ltick_timer_event(&s->tick_timer);
/* get tick_timer cnt */
tcnto = exynos4210_ltick_cnt_get_cnto(&s->tick_timer);
/* get tick_timer int */
icnto = exynos4210_ltick_int_get_cnto(&s->tick_timer);
/* raise IRQ if needed */
if (!icnto && s->reg.tcon & L_TCON_INT_START) {
/* INT counter enabled and expired */
s->reg.int_cstat |= L_INT_CSTAT_INTCNT;
/* raise interrupt if enabled */
if (s->reg.int_enb & L_INT_INTENB_ICNTEIE) {
#ifdef DEBUG_MCT
time2[s->id] = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
DPRINTF("local timer[%d] IRQ: %llx\n", s->id,
time2[s->id] - time1[s->id]);
time1[s->id] = time2[s->id];
#endif
qemu_irq_raise(s->irq);
}
/* reload ICNTB */
if (s->reg.tcon & L_TCON_INTERVAL_MODE) {
exynos4210_ltick_set_cntb(&s->tick_timer,
s->reg.cnt[L_REG_CNT_TCNTB],
s->reg.cnt[L_REG_CNT_ICNTB]);
}
} else {
/* reload TCNTB */
if (!tcnto) {
exynos4210_ltick_set_cntb(&s->tick_timer,
s->reg.cnt[L_REG_CNT_TCNTB],
icnto);
}
}
/* start tick_timer cnt */
exynos4210_ltick_cnt_start(&s->tick_timer);
/* start tick_timer int */
exynos4210_ltick_int_start(&s->tick_timer);
}
static void tx_ptimer_set_freq(ptimer_state *s, uint32_t freq)
{
/*
* callers of exynos4210_mct_update_freq() never do anything
* else that needs to be in the same ptimer transaction, so
* to avoid a lot of repetition we have a convenience function
* for begin/set_freq/commit.
*/
ptimer_transaction_begin(s);
ptimer_set_freq(s, freq);
ptimer_transaction_commit(s);
}
/* update timer frequency */
static void exynos4210_mct_update_freq(Exynos4210MCTState *s)
{
uint32_t freq = s->freq;