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hw/omap_gpmc: Fix region map/unmap when configuring prefetch engine 

When configuring the prefetch engine (and also when resetting from
a state where the prefetch engine was enabled) be careful to adhere
to the "unmap/change config fields/map" ordering, to avoid trying
to delete the wrong MemoryRegions. This fixes an assertion failure
in some cases.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Alexander Graf <agraf@suse.de>
Tested-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Peter Maydell 2011-12-20 00:21:56 +00:00
parent e023668198
commit 0ec6dc730c
1 changed files with 21 additions and 9 deletions
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30
hw/omap_gpmc.c
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@ -443,6 +443,12 @@ void omap_gpmc_reset(struct omap_gpmc_s *s)
s->irqst = 0;
s->irqen = 0;
omap_gpmc_int_update(s);
for (i = 0; i < 8; i++) {
/* This has to happen before we change any of the config
* used to determine which memory regions are mapped or unmapped.
*/
omap_gpmc_cs_unmap(s, i);
}
s->timeout = 0;
s->config = 0xa00;
s->prefetch.config1 = 0x00004000;
@ -451,7 +457,6 @@ void omap_gpmc_reset(struct omap_gpmc_s *s)
s->prefetch.fifopointer = 0;
s->prefetch.count = 0;
for (i = 0; i < 8; i ++) {
omap_gpmc_cs_unmap(s, i);
s->cs_file[i].config[1] = 0x101001;
s->cs_file[i].config[2] = 0x020201;
s->cs_file[i].config[3] = 0x10031003;
@ -716,24 +721,31 @@ static void omap_gpmc_write(void *opaque, target_phys_addr_t addr,
case 0x1e0: /* GPMC_PREFETCH_CONFIG1 */
if (!s->prefetch.startengine) {
uint32_t oldconfig1 = s->prefetch.config1;
uint32_t newconfig1 = value & 0x7f8f7fbf;
uint32_t changed;
s->prefetch.config1 = value & 0x7f8f7fbf;
changed = oldconfig1 ^ s->prefetch.config1;
changed = newconfig1 ^ s->prefetch.config1;
if (changed & (0x80 | 0x7000000)) {
/* Turning the engine on or off, or mapping it somewhere else.
* cs_map() and cs_unmap() check the prefetch config and
* overall CSVALID bits, so it is sufficient to unmap-and-map
* both the old cs and the new one.
* both the old cs and the new one. Note that we adhere to
* the "unmap/change config/map" order (and not unmap twice
* if newcs == oldcs), otherwise we'll try to delete the wrong
* memory region.
*/
int oldcs = prefetch_cs(oldconfig1);
int newcs = prefetch_cs(s->prefetch.config1);
int oldcs = prefetch_cs(s->prefetch.config1);
int newcs = prefetch_cs(newconfig1);
omap_gpmc_cs_unmap(s, oldcs);
omap_gpmc_cs_map(s, oldcs);
if (newcs != oldcs) {
if (oldcs != newcs) {
omap_gpmc_cs_unmap(s, newcs);
}
s->prefetch.config1 = newconfig1;
omap_gpmc_cs_map(s, oldcs);
if (oldcs != newcs) {
omap_gpmc_cs_map(s, newcs);
}
} else {
s->prefetch.config1 = newconfig1;
}
}
break;