Detect whether the OXPCIE card is really present while in the ROM stage.

Use an int in CAR global data to store whether or not the OXPCIE serial card
is actually there. Also, time out if the card doesn't show up quickly enough,
don't continue initialization if it's not there, and don't make the
initialization routine default to a card if none is found.

Change-Id: I9c72d3abc6ee2867b77ab2f2180e6f01f647af8c
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: http://review.coreboot.org/728
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/x86/lib/romstage_console.c

@@ -35,7 +35,10 @@ static void console_tx_byte(unsigned char byte)
 		console_tx_byte('\r');
 
 #if CONFIG_CONSOLE_SERIAL8250MEM
-	uart8250_mem_tx_byte(CONFIG_OXFORD_OXPCIE_BASE_ADDRESS + 0x1000, byte);
+	if (oxford_oxpcie_present) {
+		uart8250_mem_tx_byte(
+			CONFIG_OXFORD_OXPCIE_BASE_ADDRESS + 0x1000, byte);
+	}
 #endif
 #if CONFIG_CONSOLE_SERIAL8250
 	uart8250_tx_byte(CONFIG_TTYS0_BASE, byte);

src/drivers/oxford/oxpcie/oxpcie_early.c

@@ -20,6 +20,8 @@
 #include <stdint.h>
 #include <arch/io.h>
 #include <arch/romcc_io.h>
+#include <cpu/x86/car.h>
+#include <delay.h>
 #include <uart8250.h>
 #include <device/pci_def.h>
 
@@ -34,9 +36,13 @@
 #define OXPCIE_DEVICE_3 \
 	PCI_DEV(CONFIG_OXFORD_OXPCIE_BRIDGE_SUBORDINATE, 0, 3)
 
+#if defined(__PRE_RAM__)
+int oxford_oxpcie_present CAR_GLOBAL;
+
 void oxford_init(void)
 {
 	u16 reg16;
+	oxford_oxpcie_present = 1;
 
 	/* First we reset the secondary bus */
 	reg16 = pci_read_config16(PCIE_BRIDGE, PCI_BRIDGE_CONTROL);
@@ -69,11 +75,14 @@ void oxford_init(void)
 	reg16 |= PCI_COMMAND_MEMORY;
 	pci_write_config16(PCIE_BRIDGE, PCI_COMMAND, reg16);
 
-	// FIXME Add a timeout or this will hang forever if
+	u32 timeout = 20000; // Timeout in 10s of microseconds.
-	// no device is in the slot.
 	u32 id = 0;
-	while ((id == 0) || (id == 0xffffffff))
+	for (;;) {
 		id = pci_read_config32(OXPCIE_DEVICE, PCI_VENDOR_ID);
+		if (!timeout-- || (id != 0 && id != 0xffffffff))
+			break;
+		udelay(10);
+	}
 
 	u32 device = OXPCIE_DEVICE; /* unknown default */
 	switch (id) {
@@ -90,6 +99,10 @@ void oxford_init(void)
 	case 0xc1581415: /* e.g. Startech MPEX2S952 */
 		device = OXPCIE_DEVICE;
 		break;
+	default:
+		/* No UART here. */
+		oxford_oxpcie_present = 0;
+		return;
 	}
 
 	/* Setup base address on device */
@@ -107,3 +120,4 @@ void oxford_init(void)
 	uart8250_mem_init(uart0_base, (4000000 / CONFIG_TTYS0_BAUD));
 }
 
+#endif

src/include/uart8250.h

@@ -135,8 +135,13 @@ void uart8250_mem_init(unsigned base_port, unsigned divisor);
 u32 uart_mem_init(void);
 u32 uartmem_getbaseaddr(void);
 
+#if defined(__PRE_RAM__) && CONFIG_DRIVERS_OXFORD_OXPCIE && \
+	CONFIG_CONSOLE_SERIAL8250MEM
 /* and special init for OXPCIe based cards */
+extern int oxford_oxpcie_present;
+
 void oxford_init(void);
+#endif
 
 #endif /* __ROMCC__ */