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hw/gpio/pl061: Clean up read/write offset handling logic 

Currently the pl061_read() and pl061_write() functions handle offsets
using a combination of three if() statements and a switch().  Clean
this up to use just a switch, using case ranges.

This requires that instead of catching accesses to the luminary-only
registers on a stock PL061 via a check on s->rsvd_start we use
an "is this luminary?" check in the cases for each luminary-only
register.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2021-07-02 11:40:10 +01:00
parent 102d7d1fba
commit e24a9f6a59
1 changed files with 79 additions and 25 deletions
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104
hw/gpio/pl061.c
View File

@ -55,7 +55,6 @@ struct PL061State {
qemu_irq irq;
qemu_irq out[N_GPIOS];
const unsigned char *id;
uint32_t rsvd_start; /* reserved area: [rsvd_start, 0xfcc] */
};
static const VMStateDescription vmstate_pl061 = {
@ -151,16 +150,9 @@ static uint64_t pl061_read(void *opaque, hwaddr offset,
{
PL061State *s = (PL061State *)opaque;
if (offset < 0x400) {
return s->data & (offset >> 2);
}
if (offset >= s->rsvd_start && offset <= 0xfcc) {
goto err_out;
}
if (offset >= 0xfd0 && offset < 0x1000) {
return s->id[(offset - 0xfd0) >> 2];
}
switch (offset) {
case 0x0 ... 0x3ff: /* Data */
return s->data & (offset >> 2);
case 0x400: /* Direction */
return s->dir;
case 0x404: /* Interrupt sense */
@ -178,33 +170,68 @@ static uint64_t pl061_read(void *opaque, hwaddr offset,
case 0x420: /* Alternate function select */
return s->afsel;
case 0x500: /* 2mA drive */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->dr2r;
case 0x504: /* 4mA drive */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->dr4r;
case 0x508: /* 8mA drive */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->dr8r;
case 0x50c: /* Open drain */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->odr;
case 0x510: /* Pull-up */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->pur;
case 0x514: /* Pull-down */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->pdr;
case 0x518: /* Slew rate control */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->slr;
case 0x51c: /* Digital enable */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->den;
case 0x520: /* Lock */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->locked;
case 0x524: /* Commit */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->cr;
case 0x528: /* Analog mode select */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
return s->amsel;
case 0xfd0 ... 0xfff: /* ID registers */
return s->id[(offset - 0xfd0) >> 2];
default:
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR,
"pl061_read: Bad offset %x\n", (int)offset);
break;
}
err_out:
qemu_log_mask(LOG_GUEST_ERROR,
"pl061_read: Bad offset %x\n", (int)offset);
return 0;
}
@ -214,16 +241,12 @@ static void pl061_write(void *opaque, hwaddr offset,
PL061State *s = (PL061State *)opaque;
uint8_t mask;
if (offset < 0x400) {
switch (offset) {
case 0 ... 0x3ff:
mask = (offset >> 2) & s->dir;
s->data = (s->data & ~mask) | (value & mask);
pl061_update(s);
return;
}
if (offset >= s->rsvd_start) {
goto err_out;
}
switch (offset) {
case 0x400: /* Direction */
s->dir = value & 0xff;
break;
@ -247,47 +270,80 @@ static void pl061_write(void *opaque, hwaddr offset,
s->afsel = (s->afsel & ~mask) | (value & mask);
break;
case 0x500: /* 2mA drive */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->dr2r = value & 0xff;
break;
case 0x504: /* 4mA drive */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->dr4r = value & 0xff;
break;
case 0x508: /* 8mA drive */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->dr8r = value & 0xff;
break;
case 0x50c: /* Open drain */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->odr = value & 0xff;
break;
case 0x510: /* Pull-up */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->pur = value & 0xff;
break;
case 0x514: /* Pull-down */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->pdr = value & 0xff;
break;
case 0x518: /* Slew rate control */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->slr = value & 0xff;
break;
case 0x51c: /* Digital enable */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->den = value & 0xff;
break;
case 0x520: /* Lock */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->locked = (value != 0xacce551);
break;
case 0x524: /* Commit */
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
if (!s->locked)
s->cr = value & 0xff;
break;
case 0x528:
if (s->id != pl061_id_luminary) {
goto bad_offset;
}
s->amsel = value & 0xff;
break;
default:
goto err_out;
bad_offset:
qemu_log_mask(LOG_GUEST_ERROR,
"pl061_write: Bad offset %x\n", (int)offset);
return;
}
pl061_update(s);
return;
err_out:
qemu_log_mask(LOG_GUEST_ERROR,
"pl061_write: Bad offset %x\n", (int)offset);
}
static void pl061_reset(DeviceState *dev)
@ -343,7 +399,6 @@ static void pl061_luminary_init(Object *obj)
PL061State *s = PL061(obj);
s->id = pl061_id_luminary;
s->rsvd_start = 0x52c;
}
static void pl061_init(Object *obj)
@ -353,7 +408,6 @@ static void pl061_init(Object *obj)
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
s->id = pl061_id;
s->rsvd_start = 0x424;
memory_region_init_io(&s->iomem, obj, &pl061_ops, s, "pl061", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);