fw/pci: add Q35 S3 support

Following the i440fx example, save the LPC, SMBUS and PCIEXBAR bdfs
between OS sleeps and use them to re-configure the
corresponding registers.

Tested-by: Gal Hammer <ghammer@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>

1 files changed, 56 insertions, 17 deletions

diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
index 0ed5dfbb..35d99029 100644
--- a/src/fw/pciinit.c
+++ b/src/fw/pciinit.c
@@ -161,6 +161,22 @@ static void piix_isa_bridge_setup(struct pci_device *pci, void *arg)
     dprintf(1, "PIIX3/PIIX4 init: elcr=%02x %02x\n", elcr[0], elcr[1]);
 }
 
+static void mch_isa_lpc_setup(u16 bdf)
+{
+    /* pm io base */
+    pci_config_writel(bdf, ICH9_LPC_PMBASE,
+                      acpi_pm_base | ICH9_LPC_PMBASE_RTE);
+
+    /* 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);
+}
+
+static int ICH9LpcBDF = -1;
+
 /* ICH9 LPC PCI to ISA bridge */
 /* PCI_VENDOR_ID_INTEL && PCI_DEVICE_ID_INTEL_ICH9_LPC */
 static void mch_isa_bridge_setup(struct pci_device *dev, void *arg)
@@ -188,16 +204,10 @@ static void mch_isa_bridge_setup(struct pci_device *dev, void *arg)
     outb(elcr[1], ICH9_LPC_PORT_ELCR2);
     dprintf(1, "Q35 LPC init: elcr=%02x %02x\n", elcr[0], elcr[1]);
 
-    /* pm io base */
-    pci_config_writel(bdf, ICH9_LPC_PMBASE,
-                      acpi_pm_base | ICH9_LPC_PMBASE_RTE);
+    ICH9LpcBDF = bdf;
 
-    /* acpi enable, SCI: IRQ9 000b = irq9*/
-    pci_config_writeb(bdf, ICH9_LPC_ACPI_CTRL, ICH9_LPC_ACPI_CTRL_ACPI_EN);
+    mch_isa_lpc_setup(bdf);
 
-    /* set root complex register block BAR */
-    pci_config_writel(bdf, ICH9_LPC_RCBA,
-                      ICH9_LPC_RCBA_ADDR | ICH9_LPC_RCBA_EN);
     e820_add(ICH9_LPC_RCBA_ADDR, 16*1024, E820_RESERVED);
 
     acpi_pm1a_cnt = acpi_pm_base + 0x04;
@@ -256,11 +266,8 @@ static void piix4_pm_setup(struct pci_device *pci, void *arg)
     pmtimer_setup(acpi_pm_base + 0x08);
 }
 
-/* ICH9 SMBUS */
-/* PCI_VENDOR_ID_INTEL && PCI_DEVICE_ID_INTEL_ICH9_SMBUS */
-static void ich9_smbus_setup(struct pci_device *dev, void *arg)
+static void ich9_smbus_enable(u16 bdf)
 {
-    u16 bdf = dev->bdf;
     /* map smbus into io space */
     pci_config_writel(bdf, ICH9_SMB_SMB_BASE,
                       (acpi_pm_base + 0x100) | PCI_BASE_ADDRESS_SPACE_IO);
@@ -269,6 +276,17 @@ static void ich9_smbus_setup(struct pci_device *dev, void *arg)
     pci_config_writeb(bdf, ICH9_SMB_HOSTC, ICH9_SMB_HOSTC_HST_EN);
 }
 
+static int ICH9SmbusBDF = -1;
+
+/* ICH9 SMBUS */
+/* PCI_VENDOR_ID_INTEL && PCI_DEVICE_ID_INTEL_ICH9_SMBUS */
+static void ich9_smbus_setup(struct pci_device *dev, void *arg)
+{
+    ICH9SmbusBDF = dev->bdf;
+
+    ich9_smbus_enable(dev->bdf);
+}
+
 static const struct pci_device_id pci_device_tbl[] = {
     /* PIIX3/PIIX4 PCI to ISA bridge */
     PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0,
@@ -305,6 +323,9 @@ static const struct pci_device_id pci_device_tbl[] = {
     PCI_DEVICE_END,
 };
 
+static int MCHMmcfgBDF = -1;
+static void mch_mmconfig_setup(u16 bdf);
+
 void pci_resume(void)
 {
     if (!CONFIG_QEMU) {
@@ -314,6 +335,18 @@ void pci_resume(void)
     if (PiixPmBDF >= 0) {
         piix4_pm_config_setup(PiixPmBDF);
     }
+
+    if (ICH9LpcBDF >= 0) {
+        mch_isa_lpc_setup(ICH9LpcBDF);
+    }
+
+    if (ICH9SmbusBDF >= 0) {
+        ich9_smbus_enable(ICH9SmbusBDF);
+    }
+
+    if(MCHMmcfgBDF >= 0) {
+        mch_mmconfig_setup(MCHMmcfgBDF);
+    }
 }
 
 static void pci_bios_init_device(struct pci_device *pci)
@@ -393,18 +426,24 @@ static void i440fx_mem_addr_setup(struct pci_device *dev, void *arg)
     pci_slot_get_irq = piix_pci_slot_get_irq;
 }
 
-static void mch_mem_addr_setup(struct pci_device *dev, void *arg)
+static void mch_mmconfig_setup(u16 bdf)
 {
     u64 addr = Q35_HOST_BRIDGE_PCIEXBAR_ADDR;
-    u32 size = Q35_HOST_BRIDGE_PCIEXBAR_SIZE;
-
-    /* setup mmconfig */
-    u16 bdf = dev->bdf;
     u32 upper = addr >> 32;
     u32 lower = (addr & 0xffffffff) | Q35_HOST_BRIDGE_PCIEXBAREN;
     pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR, 0);
     pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR + 4, upper);
     pci_config_writel(bdf, Q35_HOST_BRIDGE_PCIEXBAR, lower);
+}
+
+static void mch_mem_addr_setup(struct pci_device *dev, void *arg)
+{
+    u64 addr = Q35_HOST_BRIDGE_PCIEXBAR_ADDR;
+    u32 size = Q35_HOST_BRIDGE_PCIEXBAR_SIZE;
+
+    /* setup mmconfig */
+    MCHMmcfgBDF = dev->bdf;
+    mch_mmconfig_setup(dev->bdf);
     e820_add(addr, size, E820_RESERVED);
 
     /* setup pci i/o window (above mmconfig) */