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usb: fix module not being restored after usb_close()

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usb_close() would unpower the module and gint_world_switch_out()
assumed it was powered, so the context switch would fail.
This commit is contained in:
Lephe 2021-04-27 14:45:12 +02:00
parent c37f150600
commit 50cbcd4ac1
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GPG key ID: 1BBA026E13FC0495
2 changed files with 11 additions and 0 deletions
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3
src/kernel/world.c
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@ -104,6 +104,9 @@ void gint_world_switch_out(gint_world_t world_addin, gint_world_t world_os)
gint_driver_t *d = &gint_drivers[i];
uint8_t *f = &gint_driver_flags[i];
/* Power the device if it was unpowered previously */
if(d->hpowered && !d->hpowered() && d->hpoweron) d->hpoweron();
/* For non-shared devices, save previous device state and
consider restoring the preserved one */
if(!(*f & GINT_DRV_SHARED))

8
src/usb/usb.c
View file

@ -74,7 +74,11 @@ static void hpoweron(void)
SH7305_POWER.MSTPCR2.USB0 = 0;
SH7305_USB_UPONCR.word = 0x0600;
}
/* Finish the poweron procedure by enabling writes in the registers */
static void hpoweron_write(void)
{
/* Turn on SCKE, which activates all other registers. The existing
BUSWAIT delay might not be high enough, so wait a little bit before
modifying registers; a couple CPU cycles is enough. */
@ -120,6 +124,7 @@ int usb_open(usb_interface_t const **interfaces, gint_call_t callback)
usb_open_callback = callback;
if(!hpowered()) hpoweron();
hpoweron_write();
*(uint16_t volatile *)0xa4d800c2 = 0x0020;
@ -283,6 +288,8 @@ void hsave(usb_state_t *s)
static void hrestore(usb_state_t const *s)
{
hpoweron_write();
USB.DVSTCTR.word = s->DVSTCTR;
USB.TESTMODE.word = s->TESTMODE;
USB.REG_C2 = s->REG_C2;
@ -313,6 +320,7 @@ static void hrestore(usb_state_t const *s)
gint_driver_t drv_usb = {
.name = "USB",
/* TODO: Wait for remaining transfers in unbind() */
.hpowered = hpowered,
.hpoweron = hpoweron,
.hpoweroff = hpoweroff,