[SeaBIOS] [PATCH v2] ich9: initialise RCBA register through LPC interface

[Paulo Alcantara]

This patch initialises root complex register block BAR in order to
support TCO watchdog emulation features on QEMU.

Cc: Kevin O'Connor <kevin at koconnor.net>
Cc: Gerd Hofmann <kraxel at redhat.com>
Cc: Paolo Bonzini <pbonzini at redhat.com>
Signed-off-by: Paulo Alcantara <pcacjr at zytor.com>
---
v1 -> v2:
  - reserve RCBA address via e820 map
---
 src/fw/dev-q35.h | 3 +++
 src/fw/pciinit.c | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/src/fw/dev-q35.h b/src/fw/dev-q35.h
index c6f8bd9..201825d 100644
--- a/src/fw/dev-q35.h
+++ b/src/fw/dev-q35.h
@@ -27,6 +27,9 @@
 #define ICH9_LPC_GEN_PMCON_1_SMI_LOCK  (1 << 4)
 #define ICH9_LPC_PORT_ELCR1            0x4d0
 #define ICH9_LPC_PORT_ELCR2            0x4d1
+#define ICH9_LPC_RCBA                  0xf0
+#define ICH9_LPC_RCBA_ADDR             0xfed1c000
+#define ICH9_LPC_RCBA_EN               0x1
 #define PCI_DEVICE_ID_INTEL_ICH9_SMBUS 0x2930
 #define ICH9_SMB_SMB_BASE              0x20
 #define ICH9_SMB_HOSTC                 0x40
diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
index 45870f2..3ad84ba 100644
--- a/src/fw/pciinit.c
+++ b/src/fw/pciinit.c
@@ -183,6 +183,11 @@ static void mch_isa_bridge_setup(struct pci_device *dev, void *arg)
     /* acpi enable, SCI: IRQ9 000b = irq9*/
     pci_config_writeb(bdf, ICH9_LPC_ACPI_CTRL, ICH9_LPC_ACPI_CTRL_ACPI_EN);
 
+    /* set root complex register block BAR */
+    pci_config_writel(bdf, ICH9_LPC_RCBA,
+                      ICH9_LPC_RCBA_ADDR | ICH9_LPC_RCBA_EN);
+    add_e820(ICH9_LPC_RCBA_ADDR, 16*1024, E820_RESERVED);
+
     acpi_pm1a_cnt = acpi_pm_base + 0x04;
     pmtimer_setup(acpi_pm_base + 0x08);
 }
-- 
2.1.0