From 9a238cd538e10c8c6d9e98e8dfae0bb3f04cec2c Mon Sep 17 00:00:00 2001
From: Anas Nashif <anas.nashif@intel.com>
Date: Wed, 31 Jan 2018 09:54:21 -0500
Subject: [PATCH] soc: atom: support enumerating PCI devices

This hook is needed to support enumerating PCI devices.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
---
 arch/x86/soc/atom/soc.h | 50 +++++++++++++++++++++++++++++++++++------
 1 file changed, 43 insertions(+), 7 deletions(-)

diff --git a/arch/x86/soc/atom/soc.h b/arch/x86/soc/atom/soc.h
index d211d244121..341a9d860ab 100644
--- a/arch/x86/soc/atom/soc.h
+++ b/arch/x86/soc/atom/soc.h
@@ -29,17 +29,53 @@
  */
 #define UART_NS16550_ACCESS_IOPORT
 
-#define UART_NS16550_PORT_0_BASE_ADDR		0x03F8
-#define UART_NS16550_PORT_0_IRQ			4
-#define UART_NS16550_PORT_0_CLK_FREQ		1843200
+#define UART_NS16550_PORT_0_BASE_ADDR           0x03F8
+#define UART_NS16550_PORT_0_IRQ                 4
+#define UART_NS16550_PORT_0_CLK_FREQ            1843200
 
-#define UART_NS16550_PORT_1_BASE_ADDR		0x02F8
-#define UART_NS16550_PORT_1_IRQ			3
-#define UART_NS16550_PORT_1_CLK_FREQ		1843200
+#define UART_NS16550_PORT_1_BASE_ADDR           0x02F8
+#define UART_NS16550_PORT_1_IRQ                 3
+#define UART_NS16550_PORT_1_CLK_FREQ            1843200
 
 #ifdef CONFIG_IOAPIC
 #include <drivers/ioapic.h>
-#define UART_IRQ_FLAGS				(IOAPIC_EDGE | IOAPIC_HIGH)
+#define UART_IRQ_FLAGS                          (IOAPIC_EDGE | IOAPIC_HIGH)
 #endif /* CONFIG_IOAPIC */
 
+
+/* PCI definitions */
+/* FIXME: The values below copied from generic ia32 soc, we need to get the
+ * correct numbers for Atom and the minnowboard
+ *
+ * This is added now to get basic enumartion of devices and verify that PCI
+ * driver is functional.
+ */
+#define PCI_BUS_NUMBERS 1
+
+#define PCI_CTRL_ADDR_REG 0xCF8
+#define PCI_CTRL_DATA_REG 0xCFC
+
+#define PCI_INTA 1
+#define PCI_INTB 2
+#define PCI_INTC 3
+#define PCI_INTD 4
+
+/**
+ *
+ * @brief Convert PCI interrupt PIN to IRQ
+ *
+ * @return IRQ number, -1 if the result is incorrect
+ *
+ */
+
+static inline int pci_pin2irq(int bus, int dev, int pin)
+{
+	ARG_UNUSED(bus);
+
+	if ((pin < PCI_INTA) || (pin > PCI_INTD)) {
+		return -1;
+	}
+	return 10 + (((pin + dev - 1) >> 1) & 1);
+}
+
 #endif /* __SOC_H_ */