Change in coreboot[master]: src/soc/intel/braswell/southcluster.c: Correct serail IRQ support

[Frans Hendriks (Code Review)]

Frans Hendriks has uploaded this change for review. ( https://review.coreboot.org/29398

Change subject: src/soc/intel/braswell/southcluster.c: Correct serail IRQ support
......................................................................

src/soc/intel/braswell/southcluster.c: Correct serail IRQ support

Serial IRQ was configured in quiet mode, but not enabled.
Enable serial IRQ when requested and make quiet mode configurable.

BUG=N/A
TEST=Intel CherryHill CRB

Change-Id: I7844cad69dc0563fa6109d779d0afb7c2edd7245
Signed-off-by: Frans Hendriks 
---
M src/soc/intel/braswell/Kconfig
M src/soc/intel/braswell/southcluster.c
2 files changed, 27 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/98/29398/1

diff --git a/src/soc/intel/braswell/Kconfig b/src/soc/intel/braswell/Kconfig
index 2ba7992..e8e4f14 100644
--- a/src/soc/intel/braswell/Kconfig
+++ b/src/soc/intel/braswell/Kconfig
@@ -127,4 +127,17 @@
    string
    default "soc/intel/braswell/bootblock/timestamp.inc"

+config ENABLE_SERIRQ
+	bool "Enable Serial IRQ"
+	default n
+	help
+		Enabled Serial IRQ
+
+config SERIRQ_CONTINUOUS_MODE
+	bool "Serial IRQ continuous mode"
+	default n
+	depends on ENABLE_SERIRQ
+	help
+		Enabled Serial IRQ continuous mode
+
 endif
diff --git a/src/soc/intel/braswell/southcluster.c b/src/soc/intel/braswell/southcluster.c
index dd0c78e..6e5ec63 100644
--- a/src/soc/intel/braswell/southcluster.c
+++ b/src/soc/intel/braswell/southcluster.c
@@ -77,6 +77,14 @@
 #define LPC_DEFAULT_IO_RANGE_LOWER 0
 #define LPC_DEFAULT_IO_RANGE_UPPER 0x1000

+static void sc_enable_serial_irqs(struct device *dev)
+{
+	u8 *ilb_base = (u8 *)(pci_read_config32(dev, IBASE) & ~0xF);
+
+	write32(ilb_base + ILB_OIC, read32(ilb_base + ILB_OIC) | SIRQEN);
+	write8(ilb_base + SCNT, read8(ilb_base + SCNT) | SCNT_MODE);
+}
+
 static inline int io_range_in_default(int base, int size)
 {
    /* Does it start above the range? */
@@ -161,6 +169,9 @@
    printk(BIOS_SPEW, "%s/%s (%s)\n",
    		__FILE__, __func__, dev_name(dev));

+	if (IS_ENABLED(CONFIG_ENABLE_SERIRQ))
+		sc_enable_serial_irqs(dev);
+
    /* Set up the PIRQ PIC routing based on static config. */
    for (i = 0; i < NUM_PIRQS; i++)
    	write8((void *)(pr_base + i*sizeof(ir->pic[i])),
@@ -493,7 +504,9 @@
    	write32(spi + LVSCC, cfg.lvscc | VCL);
    }
    spi_init();
-	enable_serirq_quiet_mode();
+
+	if (IS_ENABLED(CONFIG_SERIRQ_CONTINUOUS_MODE))
+		enable_serirq_quiet_mode();

printk(BIOS_DEBUG, "Finalizing SMM.\n");
    outb(APM_CNT_FINALIZE, APM_CNT);