nb/intel/sandybridge: Use PCI bitwise ops

Tested with BUILD_TIMELESS=1, Asus P8Z77-V LX2 does not change.

Change-Id: If7f3f06cd3524790b0ec96121ed0353c89eac595
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42150
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

3 files changed, 15 insertions, 36 deletions

diff --git a/src/northbridge/intel/sandybridge/early_init.c b/src/northbridge/intel/sandybridge/early_init.c
index 59f05047a3a6..0c9325da4199 100644
--- a/src/northbridge/intel/sandybridge/early_init.c
+++ b/src/northbridge/intel/sandybridge/early_init.c
@@ -64,7 +64,7 @@ static void sandybridge_setup_graphics(void)
 {
 	u32 reg32;
 	u16 reg16;
-	u8 reg8, gfxsize;
+	u8 gfxsize;
 
 	reg16 = pci_read_config16(PCI_DEV(0, 2, 0), PCI_DEVICE_ID);
 	switch (reg16) {
@@ -103,10 +103,7 @@ static void sandybridge_setup_graphics(void)
 	pci_write_config16(HOST_BRIDGE, GGC, reg16);
 
 	/* Enable 256MB aperture */
-	reg8 = pci_read_config8(PCI_DEV(0, 2, 0), MSAC);
-	reg8 &= ~0x06;
-	reg8 |= 0x02;
-	pci_write_config8(PCI_DEV(0, 2, 0), MSAC, reg8);
+	pci_update_config8(PCI_DEV(0, 2, 0), MSAC, ~0x06, 0x02);
 
 	/* Erratum workarounds */
 	reg32 = MCHBAR32(SAPMCTL);
@@ -134,7 +131,7 @@ static void sandybridge_setup_graphics(void)
 
 static void start_peg_link_training(void)
 {
-	u32 tmp, deven;
+	u32 deven;
 
 	const u16 base_rev = pci_read_config16(HOST_BRIDGE, PCI_DEVICE_ID) & BASE_REV_MASK;
 	/*
@@ -150,31 +147,22 @@ static void start_peg_link_training(void)
 	 * For each PEG device, set bit 5 to use three retries for OC (Offset Calibration).
 	 * We also clear DEFER_OC (bit 16) in order to start PEG training.
 	 */
-	if (deven & DEVEN_PEG10) {
-		tmp = pci_read_config32(PCI_DEV(0, 1, 0), AFE_PWRON) & ~(1 << 16);
-		pci_write_config32(PCI_DEV(0, 1, 0), AFE_PWRON, tmp | (1 << 5));
-	}
+	if (deven & DEVEN_PEG10)
+		pci_update_config32(PCI_DEV(0, 1, 0), AFE_PWRON, ~(1 << 16), 1 << 5);
 
-	if (deven & DEVEN_PEG11) {
-		tmp = pci_read_config32(PCI_DEV(0, 1, 1), AFE_PWRON) & ~(1 << 16);
-		pci_write_config32(PCI_DEV(0, 1, 1), AFE_PWRON, tmp | (1 << 5));
-	}
+	if (deven & DEVEN_PEG11)
+		pci_update_config32(PCI_DEV(0, 1, 1), AFE_PWRON, ~(1 << 16), 1 << 5);
 
-	if (deven & DEVEN_PEG12) {
-		tmp = pci_read_config32(PCI_DEV(0, 1, 2), AFE_PWRON) & ~(1 << 16);
-		pci_write_config32(PCI_DEV(0, 1, 2), AFE_PWRON, tmp | (1 << 5));
-	}
+	if (deven & DEVEN_PEG12)
+		pci_update_config32(PCI_DEV(0, 1, 2), AFE_PWRON, ~(1 << 16), 1 << 5);
 
-	if (deven & DEVEN_PEG60) {
-		tmp = pci_read_config32(PCI_DEV(0, 6, 0), AFE_PWRON) & ~(1 << 16);
-		pci_write_config32(PCI_DEV(0, 6, 0), AFE_PWRON, tmp | (1 << 5));
-	}
+	if (deven & DEVEN_PEG60)
+		pci_update_config32(PCI_DEV(0, 6, 0), AFE_PWRON, ~(1 << 16), 1 << 5);
 }
 
 void systemagent_early_init(void)
 {
 	u32 capid0_a;
-	u32 deven;
 	u8 reg8;
 
 	/* Device ID Override Enable should be done very early */
@@ -201,8 +189,7 @@ void systemagent_early_init(void)
 	systemagent_vtd_init();
 
 	/* Device Enable, don't touch PEG bits */
-	deven = pci_read_config32(HOST_BRIDGE, DEVEN) | DEVEN_IGD;
-	pci_write_config32(HOST_BRIDGE, DEVEN, deven);
+	pci_or_config32(HOST_BRIDGE, DEVEN, DEVEN_IGD);
 
 	sandybridge_setup_graphics();
 
diff --git a/src/northbridge/intel/sandybridge/gma.c b/src/northbridge/intel/sandybridge/gma.c
index aa66f4ae8420..83a0279b09a4 100644
--- a/src/northbridge/intel/sandybridge/gma.c
+++ b/src/northbridge/intel/sandybridge/gma.c
@@ -636,12 +636,8 @@ static const char *gma_acpi_name(const struct device *dev)
 /* Called by PCI set_vga_bridge function */
 static void gma_func0_disable(struct device *dev)
 {
-	u16 reg16;
-	struct device *dev_host = pcidev_on_root(0, 0);
-
-	reg16 = pci_read_config16(dev_host, GGC);
-	reg16 |= (1 << 1); /* Disable VGA decode */
-	pci_write_config16(dev_host, GGC, reg16);
+	/* Disable VGA decode */
+	pci_or_config16(pcidev_on_root(0, 0), GGC, 1 << 1);
 
 	dev->enabled = 0;
 }
diff --git a/src/northbridge/intel/sandybridge/romstage.c b/src/northbridge/intel/sandybridge/romstage.c
index dce024b03368..b9841b5408b7 100644
--- a/src/northbridge/intel/sandybridge/romstage.c
+++ b/src/northbridge/intel/sandybridge/romstage.c
@@ -25,12 +25,8 @@ __weak void mainboard_late_rcba_config(void)
 
 static void early_pch_reset_pmcon(void)
 {
-	u8 reg8;
-
 	/* Reset RTC power status */
-	reg8 = pci_read_config8(PCH_LPC_DEV, GEN_PMCON_3);
-	reg8 &= ~(1 << 2);
-	pci_write_config8(PCH_LPC_DEV, GEN_PMCON_3, reg8);
+	pci_and_config8(PCH_LPC_DEV, GEN_PMCON_3, ~(1 << 2));
 }
 
 /* The romstage entry point for this platform is not mainboard-specific, hence the name */