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xemu/hw/timer/exynos4210_mct.c
Guenter Roeck 1a391e20c3 hw/timer/exynos4210_mct: Initialize ptimer before starting it 
When booting a recent Linux kernel, the qemu message "Timer with delta
zero, disabling" is seen, apparently because a ptimer is started before
being initialized.  Fix the problem by initializing the offending ptimer
before starting it.

The bug is effectively harmless in the old QEMUBH setup
because the sequence of events is:
 * the delta zero means the timer expires immediately
 * ptimer_reload() arranges for exynos4210_gfrc_event() to be called
 * ptimer_reload() notices the zero delta and disables the timer
 * later, the QEMUBH runs, and exynos4210_gfrc_event() correctly
   configures the timer and restarts it

In the new transaction based API the bug is still harmless,
but differences of when the callback function runs mean the
message is not printed any more:
 * ptimer_run() does nothing as it's inside a transaction block
 * ptimer_transaction_commit() sees it has work to do and
   calls ptimer_reload()
 * the zero delta means the timer expires immediately
 * ptimer_reload() calls exynos4210_gfrc_event() directly
 * exynos4210_gfrc_event() configures the timer
 * the delta is no longer zero so ptimer_reload() doesn't complain
   (the zero-delta test is after the trigger-callback in
   the ptimer_reload() function)

Regardless, the behaviour here was not intentional, and we should
just program the ptimer correctly to start with.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20191018143149.9216-1-peter.maydell@linaro.org
[PMM: Expansion/clarification of the commit message:
 the message is about a zero delta, not a zero period;
 added detail to the commit message of the analysis of what
 is happening and why the kernel boots even with the message;
 added note that the message goes away with the new ptimer API]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-10-22 17:44:00 +01:00

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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/hw.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/hw.h"
#include "hw/irq.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"
#define EXYNOS4210_MCT(obj) \
OBJECT_CHECK(Exynos4210MCTState, (obj), TYPE_EXYNOS4210_MCT)
typedef 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 */
} Exynos4210MCTState;
/*** 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[%d] 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;
s->freq = 24000000 /
((MCT_CFG_GET_PRESCALER(s->reg_mct_cfg) + 1) *
MCT_CFG_GET_DIVIDER(s->reg_mct_cfg));
if (freq != s->freq) {
DPRINTF("freq=%dHz\n", s->freq);
/* global timer */
tx_ptimer_set_freq(s->g_timer.ptimer_frc, s->freq);
/* local timer */
tx_ptimer_set_freq(s->l_timer[0].tick_timer.ptimer_tick, s->freq);
tx_ptimer_set_freq(s->l_timer[0].ptimer_frc, s->freq);
tx_ptimer_set_freq(s->l_timer[1].tick_timer.ptimer_tick, s->freq);
tx_ptimer_set_freq(s->l_timer[1].ptimer_frc, s->freq);
}
}
/* set defaul_timer values for all fields */
static void exynos4210_mct_reset(DeviceState *d)
{
Exynos4210MCTState *s = EXYNOS4210_MCT(d);
uint32_t i;
s->reg_mct_cfg = 0;
/* global timer */
memset(&s->g_timer.reg, 0, sizeof(s->g_timer.reg));
exynos4210_gfrc_tx_begin(&s->g_timer);
exynos4210_gfrc_stop(&s->g_timer);
exynos4210_gfrc_tx_commit(&s->g_timer);
/* local timer */
memset(s->l_timer[0].reg.cnt, 0, sizeof(s->l_timer[0].reg.cnt));
memset(s->l_timer[1].reg.cnt, 0, sizeof(s->l_timer[1].reg.cnt));
for (i = 0; i < 2; i++) {
s->l_timer[i].reg.int_cstat = 0;
s->l_timer[i].reg.int_enb = 0;
s->l_timer[i].reg.tcon = 0;
s->l_timer[i].reg.wstat = 0;
s->l_timer[i].tick_timer.count = 0;
s->l_timer[i].tick_timer.distance = 0;
s->l_timer[i].tick_timer.progress = 0;
exynos4210_lfrc_tx_begin(&s->l_timer[i]);
ptimer_stop(s->l_timer[i].ptimer_frc);
exynos4210_lfrc_tx_commit(&s->l_timer[i]);
exynos4210_ltick_timer_init(&s->l_timer[i].tick_timer);
}
exynos4210_mct_update_freq(s);
}
/* Multi Core Timer read */
static uint64_t exynos4210_mct_read(void *opaque, hwaddr offset,
unsigned size)
{
Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
int index;
int shift;
uint64_t count;
uint32_t value;
int lt_i;
switch (offset) {
case MCT_CFG:
value = s->reg_mct_cfg;
break;
case G_CNT_L: case G_CNT_U:
shift = 8 * (offset & 0x4);
count = exynos4210_gfrc_get_count(&s->g_timer);
value = UINT32_MAX & (count >> shift);
DPRINTF("read FRC=0x%llx\n", count);
break;
case G_CNT_WSTAT:
value = s->g_timer.reg.cnt_wstat;
break;
case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
index = GET_G_COMP_IDX(offset);
shift = 8 * (offset & 0x4);
value = UINT32_MAX & (s->g_timer.reg.comp[index] >> shift);
break;
case G_TCON:
value = s->g_timer.reg.tcon;
break;
case G_INT_CSTAT:
value = s->g_timer.reg.int_cstat;
break;
case G_INT_ENB:
value = s->g_timer.reg.int_enb;
break;
case G_WSTAT:
value = s->g_timer.reg.wstat;
break;
case G_COMP0_ADD_INCR: case G_COMP1_ADD_INCR:
case G_COMP2_ADD_INCR: case G_COMP3_ADD_INCR:
value = s->g_timer.reg.comp_add_incr[GET_G_COMP_ADD_INCR_IDX(offset)];
break;
/* Local timers */
case L0_TCNTB: case L0_ICNTB: case L0_FRCNTB:
case L1_TCNTB: case L1_ICNTB: case L1_FRCNTB:
lt_i = GET_L_TIMER_IDX(offset);
index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
value = s->l_timer[lt_i].reg.cnt[index];
break;
case L0_TCNTO: case L1_TCNTO:
lt_i = GET_L_TIMER_IDX(offset);
value = exynos4210_ltick_cnt_get_cnto(&s->l_timer[lt_i].tick_timer);
DPRINTF("local timer[%d] read TCNTO %x\n", lt_i, value);
break;
case L0_ICNTO: case L1_ICNTO:
lt_i = GET_L_TIMER_IDX(offset);
value = exynos4210_ltick_int_get_cnto(&s->l_timer[lt_i].tick_timer);
DPRINTF("local timer[%d] read ICNTO %x\n", lt_i, value);
break;
case L0_FRCNTO: case L1_FRCNTO:
lt_i = GET_L_TIMER_IDX(offset);
value = exynos4210_lfrc_get_count(&s->l_timer[lt_i]);
break;
case L0_TCON: case L1_TCON:
lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
value = s->l_timer[lt_i].reg.tcon;
break;
case L0_INT_CSTAT: case L1_INT_CSTAT:
lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
value = s->l_timer[lt_i].reg.int_cstat;
break;
case L0_INT_ENB: case L1_INT_ENB:
lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
value = s->l_timer[lt_i].reg.int_enb;
break;
case L0_WSTAT: case L1_WSTAT:
lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
value = s->l_timer[lt_i].reg.wstat;
break;
default:
hw_error("exynos4210.mct: bad read offset "
TARGET_FMT_plx "\n", offset);
break;
}
return value;
}
/* MCT write */
static void exynos4210_mct_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
int index; /* index in buffer which represents register set */
int shift;
int lt_i;
uint64_t new_frc;
uint32_t i;
uint32_t old_val;
#ifdef DEBUG_MCT
static uint32_t icntb_max[2] = {0};
static uint32_t icntb_min[2] = {UINT32_MAX, UINT32_MAX};
static uint32_t tcntb_max[2] = {0};
static uint32_t tcntb_min[2] = {UINT32_MAX, UINT32_MAX};
#endif
new_frc = s->g_timer.reg.cnt;
switch (offset) {
case MCT_CFG:
s->reg_mct_cfg = value;
exynos4210_mct_update_freq(s);
break;
case G_CNT_L:
case G_CNT_U:
if (offset == G_CNT_L) {
DPRINTF("global timer write to reg.cntl %llx\n", value);
new_frc = (s->g_timer.reg.cnt & (uint64_t)UINT32_MAX << 32) + value;
s->g_timer.reg.cnt_wstat |= G_CNT_WSTAT_L;
}
if (offset == G_CNT_U) {
DPRINTF("global timer write to reg.cntu %llx\n", value);
new_frc = (s->g_timer.reg.cnt & UINT32_MAX) +
((uint64_t)value << 32);
s->g_timer.reg.cnt_wstat |= G_CNT_WSTAT_U;
}
s->g_timer.reg.cnt = new_frc;
exynos4210_gfrc_tx_begin(&s->g_timer);
exynos4210_gfrc_restart(s);
exynos4210_gfrc_tx_commit(&s->g_timer);
break;
case G_CNT_WSTAT:
s->g_timer.reg.cnt_wstat &= ~(value);
break;
case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
index = GET_G_COMP_IDX(offset);
shift = 8 * (offset & 0x4);
s->g_timer.reg.comp[index] =
(s->g_timer.reg.comp[index] &
(((uint64_t)UINT32_MAX << 32) >> shift)) +
(value << shift);
DPRINTF("comparator %d write 0x%llx val << %d\n", index, value, shift);
if (offset & 0x4) {
s->g_timer.reg.wstat |= G_WSTAT_COMP_U(index);
} else {
s->g_timer.reg.wstat |= G_WSTAT_COMP_L(index);
}
exynos4210_gfrc_tx_begin(&s->g_timer);
exynos4210_gfrc_restart(s);
exynos4210_gfrc_tx_commit(&s->g_timer);
break;
case G_TCON:
old_val = s->g_timer.reg.tcon;
s->g_timer.reg.tcon = value;
s->g_timer.reg.wstat |= G_WSTAT_TCON_WRITE;
DPRINTF("global timer write to reg.g_tcon %llx\n", value);
exynos4210_gfrc_tx_begin(&s->g_timer);
/* Start FRC if transition from disabled to enabled */
if ((value & G_TCON_TIMER_ENABLE) > (old_val &
G_TCON_TIMER_ENABLE)) {
exynos4210_gfrc_restart(s);
}
if ((value & G_TCON_TIMER_ENABLE) < (old_val &
G_TCON_TIMER_ENABLE)) {
exynos4210_gfrc_stop(&s->g_timer);
}
/* Start CMP if transition from disabled to enabled */
for (i = 0; i < MCT_GT_CMP_NUM; i++) {
if ((value & G_TCON_COMP_ENABLE(i)) != (old_val &
G_TCON_COMP_ENABLE(i))) {
exynos4210_gfrc_restart(s);
}
}
exynos4210_gfrc_tx_commit(&s->g_timer);
break;
case G_INT_CSTAT:
s->g_timer.reg.int_cstat &= ~(value);
for (i = 0; i < MCT_GT_CMP_NUM; i++) {
if (value & G_INT_CSTAT_COMP(i)) {
exynos4210_gcomp_lower_irq(&s->g_timer, i);
}
}
break;
case G_INT_ENB:
/* Raise IRQ if transition from disabled to enabled and CSTAT pending */
for (i = 0; i < MCT_GT_CMP_NUM; i++) {
if ((value & G_INT_ENABLE(i)) > (s->g_timer.reg.tcon &
G_INT_ENABLE(i))) {
if (s->g_timer.reg.int_cstat & G_INT_CSTAT_COMP(i)) {
exynos4210_gcomp_raise_irq(&s->g_timer, i);
}
}
if ((value & G_INT_ENABLE(i)) < (s->g_timer.reg.tcon &
G_INT_ENABLE(i))) {
exynos4210_gcomp_lower_irq(&s->g_timer, i);
}
}
DPRINTF("global timer INT enable %llx\n", value);
s->g_timer.reg.int_enb = value;
break;
case G_WSTAT:
s->g_timer.reg.wstat &= ~(value);
break;
case G_COMP0_ADD_INCR: case G_COMP1_ADD_INCR:
case G_COMP2_ADD_INCR: case G_COMP3_ADD_INCR:
index = GET_G_COMP_ADD_INCR_IDX(offset);
s->g_timer.reg.comp_add_incr[index] = value;
s->g_timer.reg.wstat |= G_WSTAT_COMP_ADDINCR(index);
break;
/* Local timers */
case L0_TCON: case L1_TCON:
lt_i = GET_L_TIMER_IDX(offset);
old_val = s->l_timer[lt_i].reg.tcon;
s->l_timer[lt_i].reg.wstat |= L_WSTAT_TCON_WRITE;
s->l_timer[lt_i].reg.tcon = value;
exynos4210_ltick_tx_begin(&s->l_timer[lt_i].tick_timer);
/* Stop local CNT */
if ((value & L_TCON_TICK_START) <
(old_val & L_TCON_TICK_START)) {
DPRINTF("local timer[%d] stop cnt\n", lt_i);
exynos4210_ltick_cnt_stop(&s->l_timer[lt_i].tick_timer);
}
/* Stop local INT */
if ((value & L_TCON_INT_START) <
(old_val & L_TCON_INT_START)) {
DPRINTF("local timer[%d] stop int\n", lt_i);
exynos4210_ltick_int_stop(&s->l_timer[lt_i].tick_timer);
}
/* Start local CNT */
if ((value & L_TCON_TICK_START) >
(old_val & L_TCON_TICK_START)) {
DPRINTF("local timer[%d] start cnt\n", lt_i);
exynos4210_ltick_cnt_start(&s->l_timer[lt_i].tick_timer);
}
/* Start local INT */
if ((value & L_TCON_INT_START) >
(old_val & L_TCON_INT_START)) {
DPRINTF("local timer[%d] start int\n", lt_i);
exynos4210_ltick_int_start(&s->l_timer[lt_i].tick_timer);
}
exynos4210_ltick_tx_commit(&s->l_timer[lt_i].tick_timer);
/* Start or Stop local FRC if TCON changed */
exynos4210_lfrc_tx_begin(&s->l_timer[lt_i]);
if ((value & L_TCON_FRC_START) >
(s->l_timer[lt_i].reg.tcon & L_TCON_FRC_START)) {
DPRINTF("local timer[%d] start frc\n", lt_i);
exynos4210_lfrc_start(&s->l_timer[lt_i]);
}
if ((value & L_TCON_FRC_START) <
(s->l_timer[lt_i].reg.tcon & L_TCON_FRC_START)) {
DPRINTF("local timer[%d] stop frc\n", lt_i);
exynos4210_lfrc_stop(&s->l_timer[lt_i]);
}
exynos4210_lfrc_tx_commit(&s->l_timer[lt_i]);
break;
case L0_TCNTB: case L1_TCNTB:
lt_i = GET_L_TIMER_IDX(offset);
index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
/*
* TCNTB is updated to internal register only after CNT expired.
* Due to this we should reload timer to nearest moment when CNT is
* expired and then in event handler update tcntb to new TCNTB value.
*/
exynos4210_ltick_tx_begin(&s->l_timer[lt_i].tick_timer);
exynos4210_ltick_set_cntb(&s->l_timer[lt_i].tick_timer, value,
s->l_timer[lt_i].tick_timer.icntb);
exynos4210_ltick_tx_commit(&s->l_timer[lt_i].tick_timer);
s->l_timer[lt_i].reg.wstat |= L_WSTAT_TCNTB_WRITE;
s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB] = value;
#ifdef DEBUG_MCT
if (tcntb_min[lt_i] > value) {
tcntb_min[lt_i] = value;
}
if (tcntb_max[lt_i] < value) {
tcntb_max[lt_i] = value;
}
DPRINTF("local timer[%d] TCNTB write %llx; max=%x, min=%x\n",
lt_i, value, tcntb_max[lt_i], tcntb_min[lt_i]);
#endif
break;
case L0_ICNTB: case L1_ICNTB:
lt_i = GET_L_TIMER_IDX(offset);
index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
s->l_timer[lt_i].reg.wstat |= L_WSTAT_ICNTB_WRITE;
s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] = value &
~L_ICNTB_MANUAL_UPDATE;
/*
* We need to avoid too small values for TCNTB*ICNTB. If not, IRQ event
* could raise too fast disallowing QEMU to execute target code.
*/
if (s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] *
s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB] < MCT_LT_CNT_LOW_LIMIT) {
if (!s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB]) {
s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] =
MCT_LT_CNT_LOW_LIMIT;
} else {
s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] =
MCT_LT_CNT_LOW_LIMIT /
s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB];
}
}
if (value & L_ICNTB_MANUAL_UPDATE) {
exynos4210_ltick_set_cntb(&s->l_timer[lt_i].tick_timer,
s->l_timer[lt_i].tick_timer.tcntb,
s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB]);
}
#ifdef DEBUG_MCT
if (icntb_min[lt_i] > value) {
icntb_min[lt_i] = value;
}
if (icntb_max[lt_i] < value) {
icntb_max[lt_i] = value;
}
DPRINTF("local timer[%d] ICNTB write %llx; max=%x, min=%x\n\n",
lt_i, value, icntb_max[lt_i], icntb_min[lt_i]);
#endif
break;
case L0_FRCNTB: case L1_FRCNTB:
lt_i = GET_L_TIMER_IDX(offset);
index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
DPRINTF("local timer[%d] FRCNTB write %llx\n", lt_i, value);
s->l_timer[lt_i].reg.wstat |= L_WSTAT_FRCCNTB_WRITE;
s->l_timer[lt_i].reg.cnt[L_REG_CNT_FRCCNTB] = value;
break;
case L0_TCNTO: case L1_TCNTO:
case L0_ICNTO: case L1_ICNTO:
case L0_FRCNTO: case L1_FRCNTO:
qemu_log_mask(LOG_GUEST_ERROR,
"exynos4210.mct: write to RO register " TARGET_FMT_plx,
offset);
break;
case L0_INT_CSTAT: case L1_INT_CSTAT:
lt_i = GET_L_TIMER_IDX(offset);
DPRINTF("local timer[%d] CSTAT write %llx\n", lt_i, value);
s->l_timer[lt_i].reg.int_cstat &= ~value;
if (!s->l_timer[lt_i].reg.int_cstat) {
qemu_irq_lower(s->l_timer[lt_i].irq);
}
break;
case L0_INT_ENB: case L1_INT_ENB:
lt_i = GET_L_TIMER_IDX(offset);
old_val = s->l_timer[lt_i].reg.int_enb;
/* Raise Local timer IRQ if cstat is pending */
if ((value & L_INT_INTENB_ICNTEIE) > (old_val & L_INT_INTENB_ICNTEIE)) {
if (s->l_timer[lt_i].reg.int_cstat & L_INT_CSTAT_INTCNT) {
qemu_irq_raise(s->l_timer[lt_i].irq);
}
}
s->l_timer[lt_i].reg.int_enb = value;
break;
case L0_WSTAT: case L1_WSTAT:
lt_i = GET_L_TIMER_IDX(offset);
s->l_timer[lt_i].reg.wstat &= ~value;
break;
default:
hw_error("exynos4210.mct: bad write offset "
TARGET_FMT_plx "\n", offset);
break;
}
}
static const MemoryRegionOps exynos4210_mct_ops = {
.read = exynos4210_mct_read,
.write = exynos4210_mct_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
/* MCT init */
static void exynos4210_mct_init(Object *obj)
{
int i;
Exynos4210MCTState *s = EXYNOS4210_MCT(obj);
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
/* Global timer */
s->g_timer.ptimer_frc = ptimer_init(exynos4210_gfrc_event, s,
PTIMER_POLICY_DEFAULT);
memset(&s->g_timer.reg, 0, sizeof(struct gregs));
/* Local timers */
for (i = 0; i < 2; i++) {
s->l_timer[i].tick_timer.ptimer_tick =
ptimer_init(exynos4210_ltick_event, &s->l_timer[i],
PTIMER_POLICY_DEFAULT);
s->l_timer[i].ptimer_frc =
ptimer_init(exynos4210_lfrc_event, &s->l_timer[i],
PTIMER_POLICY_DEFAULT);
s->l_timer[i].id = i;
}
/* IRQs */
for (i = 0; i < MCT_GT_CMP_NUM; i++) {
sysbus_init_irq(dev, &s->g_timer.irq[i]);
}
for (i = 0; i < 2; i++) {
sysbus_init_irq(dev, &s->l_timer[i].irq);
}
memory_region_init_io(&s->iomem, obj, &exynos4210_mct_ops, s,
"exynos4210-mct", MCT_SFR_SIZE);
sysbus_init_mmio(dev, &s->iomem);
}
static void exynos4210_mct_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = exynos4210_mct_reset;
dc->vmsd = &vmstate_exynos4210_mct_state;
}
static const TypeInfo exynos4210_mct_info = {
.name = TYPE_EXYNOS4210_MCT,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(Exynos4210MCTState),
.instance_init = exynos4210_mct_init,
.class_init = exynos4210_mct_class_init,
};
static void exynos4210_mct_register_types(void)
{
type_register_static(&exynos4210_mct_info);
}
type_init(exynos4210_mct_register_types)
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