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i2c: pm_smbus: Add interrupt handling 

Add the necessary code so that interrupts actually work from
the pm_smbus device.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1534796770-10295-7-git-send-email-minyard@acm.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Corey Minyard 2018-08-20 15:26:06 -05:00 committed by Paolo Bonzini
parent 38ad4fae43
commit e724385a70
3 changed files with 31 additions and 1 deletions
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14
hw/i2c/pm_smbus.c
View File

@ -214,6 +214,12 @@ static void smb_transaction_start(PMSMBus *s)
s->smb_stat |= STS_HOST_BUSY;
}
static bool
smb_irq_value(PMSMBus *s)
{
return ((s->smb_stat & ~STS_HOST_BUSY) != 0) && (s->smb_ctl & CTL_INTREN);
}
static void smb_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,
unsigned width)
{
@ -309,7 +315,9 @@ static void smb_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,
}
out:
return;
if (s->set_irq) {
s->set_irq(s, smb_irq_value(s));
}
}
static uint64_t smb_ioport_readb(void *opaque, hwaddr addr, unsigned width)
@ -365,6 +373,10 @@ static uint64_t smb_ioport_readb(void *opaque, hwaddr addr, unsigned width)
SMBUS_DPRINTF("SMB readb port=0x%04" HWADDR_PRIx " val=0x%02x\n",
addr, val);
if (s->set_irq) {
s->set_irq(s, smb_irq_value(s));
}
return val;
}

16
hw/i2c/smbus_ich9.c
View File

@ -40,6 +40,8 @@
typedef struct ICH9SMBState {
PCIDevice dev;
bool irq_enabled;
PMSMBus smb;
} ICH9SMBState;
@ -109,11 +111,25 @@ static void ich9_smb_class_init(ObjectClass *klass, void *data)
dc->user_creatable = false;
}
static void ich9_smb_set_irq(PMSMBus *pmsmb, bool enabled)
{
ICH9SMBState *s = pmsmb->opaque;
if (enabled == s->irq_enabled) {
return;
}
s->irq_enabled = enabled;
pci_set_irq(&s->dev, enabled);
}
I2CBus *ich9_smb_init(PCIBus *bus, int devfn, uint32_t smb_io_base)
{
PCIDevice *d =
pci_create_simple_multifunction(bus, devfn, true, TYPE_ICH9_SMB_DEVICE);
ICH9SMBState *s = ICH9_SMB_DEVICE(d);
s->smb.set_irq = ich9_smb_set_irq;
s->smb.opaque = s;
return s->smb.smbus;
}

2
include/hw/i2c/pm_smbus.h
View File

@ -23,6 +23,8 @@ typedef struct PMSMBus {
/* Set by the user. */
bool i2c_enable;
void (*set_irq)(struct PMSMBus *s, bool enabled);
void *opaque;
/* Internally used by pm_smbus. */