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qemu/hw/timer/omap_gptimer.c

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/*
* TI OMAP2 general purpose timers emulation.
*
* Copyright (C) 2007-2008 Nokia Corporation
* Written by Andrzej Zaborowski <andrew@openedhand.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 or
* (at your option) any later version of the License.
*
* 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/>.
*/
#include "hw/hw.h"
#include "qemu/timer.h"
#include "hw/arm/omap.h"
/* GP timers */
struct omap_gp_timer_s {
MemoryRegion iomem;
qemu_irq irq;
qemu_irq wkup;
qemu_irq in;
qemu_irq out;
omap_clk clk;
QEMUTimer *timer;
QEMUTimer *match;
struct omap_target_agent_s *ta;
int in_val;
int out_val;
int64_t time;
int64_t rate;
int64_t ticks_per_sec;
int16_t config;
int status;
int it_ena;
int wu_ena;
int enable;
int inout;
int capt2;
int pt;
enum {
gpt_trigger_none, gpt_trigger_overflow, gpt_trigger_both
} trigger;
enum {
gpt_capture_none, gpt_capture_rising,
gpt_capture_falling, gpt_capture_both
} capture;
int scpwm;
int ce;
int pre;
int ptv;
int ar;
int st;
int posted;
uint32_t val;
uint32_t load_val;
uint32_t capture_val[2];
uint32_t match_val;
int capt_num;
uint16_t writeh; /* LSB */
uint16_t readh; /* MSB */
};
#define GPT_TCAR_IT (1 << 2)
#define GPT_OVF_IT (1 << 1)
#define GPT_MAT_IT (1 << 0)
static inline void omap_gp_timer_intr(struct omap_gp_timer_s *timer, int it)
{
if (timer->it_ena & it) {
if (!timer->status)
qemu_irq_raise(timer->irq);
timer->status |= it;
/* Or are the status bits set even when masked?
* i.e. is masking applied before or after the status register? */
}
if (timer->wu_ena & it)
qemu_irq_pulse(timer->wkup);
}
static inline void omap_gp_timer_out(struct omap_gp_timer_s *timer, int level)
{
if (!timer->inout && timer->out_val != level) {
timer->out_val = level;
qemu_set_irq(timer->out, level);
}
}
static inline uint32_t omap_gp_timer_read(struct omap_gp_timer_s *timer)
{
uint64_t distance;
if (timer->st && timer->rate) {
distance = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - timer->time;
distance = muldiv64(distance, timer->rate, timer->ticks_per_sec);
if (distance >= 0xffffffff - timer->val)
return 0xffffffff;
else
return timer->val + distance;
} else
return timer->val;
}
static inline void omap_gp_timer_sync(struct omap_gp_timer_s *timer)
{
if (timer->st) {
timer->val = omap_gp_timer_read(timer);
timer->time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
}
}
static inline void omap_gp_timer_update(struct omap_gp_timer_s *timer)
{
int64_t expires, matches;
if (timer->st && timer->rate) {
expires = muldiv64(0x100000000ll - timer->val,
timer->ticks_per_sec, timer->rate);
timer_mod(timer->timer, timer->time + expires);
if (timer->ce && timer->match_val >= timer->val) {
matches = muldiv64(timer->match_val - timer->val,
timer->ticks_per_sec, timer->rate);
timer_mod(timer->match, timer->time + matches);
} else
timer_del(timer->match);
} else {
timer_del(timer->timer);
timer_del(timer->match);
omap_gp_timer_out(timer, timer->scpwm);
}
}
static inline void omap_gp_timer_trigger(struct omap_gp_timer_s *timer)
{
if (timer->pt)
/* TODO in overflow-and-match mode if the first event to
* occur is the match, don't toggle. */
omap_gp_timer_out(timer, !timer->out_val);
else
/* TODO inverted pulse on timer->out_val == 1? */
qemu_irq_pulse(timer->out);
}
static void omap_gp_timer_tick(void *opaque)
{
struct omap_gp_timer_s *timer = (struct omap_gp_timer_s *) opaque;
if (!timer->ar) {
timer->st = 0;
timer->val = 0;
} else {
timer->val = timer->load_val;
timer->time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
}
if (timer->trigger == gpt_trigger_overflow ||
timer->trigger == gpt_trigger_both)
omap_gp_timer_trigger(timer);
omap_gp_timer_intr(timer, GPT_OVF_IT);
omap_gp_timer_update(timer);
}
static void omap_gp_timer_match(void *opaque)
{
struct omap_gp_timer_s *timer = (struct omap_gp_timer_s *) opaque;
if (timer->trigger == gpt_trigger_both)
omap_gp_timer_trigger(timer);
omap_gp_timer_intr(timer, GPT_MAT_IT);
}
static void omap_gp_timer_input(void *opaque, int line, int on)
{
struct omap_gp_timer_s *s = (struct omap_gp_timer_s *) opaque;
int trigger;
switch (s->capture) {
default:
case gpt_capture_none:
trigger = 0;
break;
case gpt_capture_rising:
trigger = !s->in_val && on;
break;
case gpt_capture_falling:
trigger = s->in_val && !on;
break;
case gpt_capture_both:
trigger = (s->in_val == !on);
break;
}
s->in_val = on;
if (s->inout && trigger && s->capt_num < 2) {
s->capture_val[s->capt_num] = omap_gp_timer_read(s);
if (s->capt2 == s->capt_num ++)
omap_gp_timer_intr(s, GPT_TCAR_IT);
}
}
static void omap_gp_timer_clk_update(void *opaque, int line, int on)
{
struct omap_gp_timer_s *timer = (struct omap_gp_timer_s *) opaque;
omap_gp_timer_sync(timer);
timer->rate = on ? omap_clk_getrate(timer->clk) : 0;
omap_gp_timer_update(timer);
}
static void omap_gp_timer_clk_setup(struct omap_gp_timer_s *timer)
{
omap_clk_adduser(timer->clk,
qemu_allocate_irqs(omap_gp_timer_clk_update, timer, 1)[0]);
timer->rate = omap_clk_getrate(timer->clk);
}
void omap_gp_timer_reset(struct omap_gp_timer_s *s)
{
s->config = 0x000;
s->status = 0;
s->it_ena = 0;
s->wu_ena = 0;
s->inout = 0;
s->capt2 = 0;
s->capt_num = 0;
s->pt = 0;
s->trigger = gpt_trigger_none;
s->capture = gpt_capture_none;
s->scpwm = 0;
s->ce = 0;
s->pre = 0;
s->ptv = 0;
s->ar = 0;
s->st = 0;
s->posted = 1;
s->val = 0x00000000;
s->load_val = 0x00000000;
s->capture_val[0] = 0x00000000;
s->capture_val[1] = 0x00000000;
s->match_val = 0x00000000;
omap_gp_timer_update(s);
}
static uint32_t omap_gp_timer_readw(void *opaque, hwaddr addr)
{
struct omap_gp_timer_s *s = (struct omap_gp_timer_s *) opaque;
switch (addr) {
case 0x00: /* TIDR */
return 0x21;
case 0x10: /* TIOCP_CFG */
return s->config;
case 0x14: /* TISTAT */
/* ??? When's this bit reset? */
return 1; /* RESETDONE */
case 0x18: /* TISR */
return s->status;
case 0x1c: /* TIER */
return s->it_ena;
case 0x20: /* TWER */
return s->wu_ena;
case 0x24: /* TCLR */
return (s->inout << 14) |
(s->capt2 << 13) |
(s->pt << 12) |
(s->trigger << 10) |
(s->capture << 8) |
(s->scpwm << 7) |
(s->ce << 6) |
(s->pre << 5) |
(s->ptv << 2) |
(s->ar << 1) |
(s->st << 0);
case 0x28: /* TCRR */
return omap_gp_timer_read(s);
case 0x2c: /* TLDR */
return s->load_val;
case 0x30: /* TTGR */
return 0xffffffff;
case 0x34: /* TWPS */
return 0x00000000; /* No posted writes pending. */
case 0x38: /* TMAR */
return s->match_val;
case 0x3c: /* TCAR1 */
return s->capture_val[0];
case 0x40: /* TSICR */
return s->posted << 2;
case 0x44: /* TCAR2 */
return s->capture_val[1];
}
OMAP_BAD_REG(addr);
return 0;
}
static uint32_t omap_gp_timer_readh(void *opaque, hwaddr addr)
{
struct omap_gp_timer_s *s = (struct omap_gp_timer_s *) opaque;
uint32_t ret;
if (addr & 2)
return s->readh;
else {
ret = omap_gp_timer_readw(opaque, addr);
s->readh = ret >> 16;
return ret & 0xffff;
}
}
static void omap_gp_timer_write(void *opaque, hwaddr addr,
uint32_t value)
{
struct omap_gp_timer_s *s = (struct omap_gp_timer_s *) opaque;
switch (addr) {
case 0x00: /* TIDR */
case 0x14: /* TISTAT */
case 0x34: /* TWPS */
case 0x3c: /* TCAR1 */
case 0x44: /* TCAR2 */
OMAP_RO_REG(addr);
break;
case 0x10: /* TIOCP_CFG */
s->config = value & 0x33d;
if (((value >> 3) & 3) == 3) /* IDLEMODE */
fprintf(stderr, "%s: illegal IDLEMODE value in TIOCP_CFG\n",
__FUNCTION__);
if (value & 2) /* SOFTRESET */
omap_gp_timer_reset(s);
break;
case 0x18: /* TISR */
if (value & GPT_TCAR_IT)
s->capt_num = 0;
if (s->status && !(s->status &= ~value))
qemu_irq_lower(s->irq);
break;
case 0x1c: /* TIER */
s->it_ena = value & 7;
break;
case 0x20: /* TWER */
s->wu_ena = value & 7;
break;
case 0x24: /* TCLR */
omap_gp_timer_sync(s);
s->inout = (value >> 14) & 1;
s->capt2 = (value >> 13) & 1;
s->pt = (value >> 12) & 1;
s->trigger = (value >> 10) & 3;
if (s->capture == gpt_capture_none &&
((value >> 8) & 3) != gpt_capture_none)
s->capt_num = 0;
s->capture = (value >> 8) & 3;
s->scpwm = (value >> 7) & 1;
s->ce = (value >> 6) & 1;
s->pre = (value >> 5) & 1;
s->ptv = (value >> 2) & 7;
s->ar = (value >> 1) & 1;
s->st = (value >> 0) & 1;
if (s->inout && s->trigger != gpt_trigger_none)
fprintf(stderr, "%s: GP timer pin must be an output "
"for this trigger mode\n", __FUNCTION__);
if (!s->inout && s->capture != gpt_capture_none)
fprintf(stderr, "%s: GP timer pin must be an input "
"for this capture mode\n", __FUNCTION__);
if (s->trigger == gpt_trigger_none)
omap_gp_timer_out(s, s->scpwm);
/* TODO: make sure this doesn't overflow 32-bits */
s->ticks_per_sec = get_ticks_per_sec() << (s->pre ? s->ptv + 1 : 0);
omap_gp_timer_update(s);
break;
case 0x28: /* TCRR */
s->time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
s->val = value;
omap_gp_timer_update(s);
break;
case 0x2c: /* TLDR */
s->load_val = value;
break;
case 0x30: /* TTGR */
s->time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
s->val = s->load_val;
omap_gp_timer_update(s);
break;
case 0x38: /* TMAR */
omap_gp_timer_sync(s);
s->match_val = value;
omap_gp_timer_update(s);
break;
case 0x40: /* TSICR */
s->posted = (value >> 2) & 1;
if (value & 2) /* How much exactly are we supposed to reset? */
omap_gp_timer_reset(s);
break;
default:
OMAP_BAD_REG(addr);
}
}
static void omap_gp_timer_writeh(void *opaque, hwaddr addr,
uint32_t value)
{
struct omap_gp_timer_s *s = (struct omap_gp_timer_s *) opaque;
if (addr & 2)
return omap_gp_timer_write(opaque, addr, (value << 16) | s->writeh);
else
s->writeh = (uint16_t) value;
}
static const MemoryRegionOps omap_gp_timer_ops = {
.old_mmio = {
.read = {
omap_badwidth_read32,
omap_gp_timer_readh,
omap_gp_timer_readw,
},
.write = {
omap_badwidth_write32,
omap_gp_timer_writeh,
omap_gp_timer_write,
},
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
struct omap_gp_timer_s *omap_gp_timer_init(struct omap_target_agent_s *ta,
qemu_irq irq, omap_clk fclk, omap_clk iclk)
{
struct omap_gp_timer_s *s = (struct omap_gp_timer_s *)
g_malloc0(sizeof(struct omap_gp_timer_s));
s->ta = ta;
s->irq = irq;
s->clk = fclk;
s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, omap_gp_timer_tick, s);
s->match = timer_new_ns(QEMU_CLOCK_VIRTUAL, omap_gp_timer_match, s);
s->in = qemu_allocate_irqs(omap_gp_timer_input, s, 1)[0];
omap_gp_timer_reset(s);
omap_gp_timer_clk_setup(s);
memory_region_init_io(&s->iomem, NULL, &omap_gp_timer_ops, s, "omap.gptimer",
omap_l4_region_size(ta, 0));
omap_l4_attach(ta, 0, &s->iomem);
return s;
}
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