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/*
* TI OMAP processors GPIO emulation.
*
* Copyright (C) 2006-2008 Andrzej Zaborowski <balrog@zabor.org>
* Copyright (C) 2007-2009 Nokia Corporation
*
* 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) version 3 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.h"
#include "omap.h"
/* General-Purpose I/O */
struct omap_gpio_s {
qemu_irq irq;
qemu_irq *in;
qemu_irq handler[16];
uint16_t inputs;
uint16_t outputs;
uint16_t dir;
uint16_t edge;
uint16_t mask;
uint16_t ints;
uint16_t pins;
};
static void omap_gpio_set(void *opaque, int line, int level)
{
struct omap_gpio_s *s = (struct omap_gpio_s *) opaque;
uint16_t prev = s->inputs;
if (level)
s->inputs |= 1 << line;
else
s->inputs &= ~(1 << line);
if (((s->edge & s->inputs & ~prev) | (~s->edge & ~s->inputs & prev)) &
(1 << line) & s->dir & ~s->mask) {
s->ints |= 1 << line;
qemu_irq_raise(s->irq);
}
}
static uint32_t omap_gpio_read(void *opaque, target_phys_addr_t addr)
{
struct omap_gpio_s *s = (struct omap_gpio_s *) opaque;
int offset = addr & OMAP_MPUI_REG_MASK;
switch (offset) {
case 0x00: /* DATA_INPUT */
return s->inputs & s->pins;
case 0x04: /* DATA_OUTPUT */
return s->outputs;
case 0x08: /* DIRECTION_CONTROL */
return s->dir;
case 0x0c: /* INTERRUPT_CONTROL */
return s->edge;
case 0x10: /* INTERRUPT_MASK */
return s->mask;
case 0x14: /* INTERRUPT_STATUS */
return s->ints;
case 0x18: /* PIN_CONTROL (not in OMAP310) */
OMAP_BAD_REG(addr);
return s->pins;
}
OMAP_BAD_REG(addr);
return 0;
}
static void omap_gpio_write(void *opaque, target_phys_addr_t addr,
uint32_t value)
{
struct omap_gpio_s *s = (struct omap_gpio_s *) opaque;
int offset = addr & OMAP_MPUI_REG_MASK;
uint16_t diff;
int ln;
switch (offset) {
case 0x00: /* DATA_INPUT */
OMAP_RO_REG(addr);
return;
case 0x04: /* DATA_OUTPUT */
diff = (s->outputs ^ value) & ~s->dir;
s->outputs = value;
while ((ln = ffs(diff))) {
ln --;
if (s->handler[ln])
qemu_set_irq(s->handler[ln], (value >> ln) & 1);
diff &= ~(1 << ln);
}
break;
case 0x08: /* DIRECTION_CONTROL */
diff = s->outputs & (s->dir ^ value);
s->dir = value;
value = s->outputs & ~s->dir;
while ((ln = ffs(diff))) {
ln --;
if (s->handler[ln])
qemu_set_irq(s->handler[ln], (value >> ln) & 1);
diff &= ~(1 << ln);
}
break;
case 0x0c: /* INTERRUPT_CONTROL */
s->edge = value;
break;
case 0x10: /* INTERRUPT_MASK */
s->mask = value;
break;
case 0x14: /* INTERRUPT_STATUS */
s->ints &= ~value;
if (!s->ints)
qemu_irq_lower(s->irq);
break;
case 0x18: /* PIN_CONTROL (not in OMAP310 TRM) */
OMAP_BAD_REG(addr);
s->pins = value;
break;
default:
OMAP_BAD_REG(addr);
return;
}
}
/* *Some* sources say the memory region is 32-bit. */
static CPUReadMemoryFunc * const omap_gpio_readfn[] = {
omap_badwidth_read16,
omap_gpio_read,
omap_badwidth_read16,
};
static CPUWriteMemoryFunc * const omap_gpio_writefn[] = {
omap_badwidth_write16,
omap_gpio_write,
omap_badwidth_write16,
};
void omap_gpio_reset(struct omap_gpio_s *s)
{
s->inputs = 0;
s->outputs = ~0;
s->dir = ~0;
s->edge = ~0;
s->mask = ~0;
s->ints = 0;
s->pins = ~0;
}
struct omap_gpio_s *omap_gpio_init(target_phys_addr_t base,
qemu_irq irq, omap_clk clk)
{
int iomemtype;
struct omap_gpio_s *s = (struct omap_gpio_s *)
qemu_mallocz(sizeof(struct omap_gpio_s));
s->irq = irq;
s->in = qemu_allocate_irqs(omap_gpio_set, s, 16);
omap_gpio_reset(s);
iomemtype = cpu_register_io_memory(omap_gpio_readfn,
omap_gpio_writefn, s);
cpu_register_physical_memory(base, 0x1000, iomemtype);
return s;
}
qemu_irq *omap_gpio_in_get(struct omap_gpio_s *s)
{
return s->in;
}
void omap_gpio_out_set(struct omap_gpio_s *s, int line, qemu_irq handler)
{
if (line >= 16 || line < 0)
hw_error("%s: No GPIO line %i\n", __FUNCTION__, line);
s->handler[line] = handler;
}
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