sh: pci: Support slot 4 routing on SDK7786.

SDK7786 supports connecting either slot3 or 4 to the same PCIe port by
way of FPGA muxing. By default the vertical slot 3 on the baseboard is
enabled, so this adds in a command line option for forcibly enabling the
slot 4 edge connector.

If nothing has been specified on the command line, we fall back to
reading the resistor values for card presence to figure out where to
route the port to.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sh/include/mach-sdk7786/mach/fpga.h b/arch/sh/include/mach-sdk7786/mach/fpga.h
index 416b621d94d1..8cc784147b96 100644
--- a/arch/sh/include/mach-sdk7786/mach/fpga.h
+++ b/arch/sh/include/mach-sdk7786/mach/fpga.h
@@ -31,7 +31,16 @@
 #define EXTASR          0x110
 #define SPCAR           0x120
 #define INTMSR          0x130
+
 #define PCIECR          0x140
+#define  PCIECR_PCIEMUX1        BIT(15)
+#define  PCIECR_PCIEMUX0        BIT(14)
+#define  PCIECR_PRST4           BIT(12) /* slot 4 card present */
+#define  PCIECR_PRST3           BIT(11) /* slot 3 card present */
+#define  PCIECR_PRST2           BIT(10) /* slot 2 card present */
+#define  PCIECR_PRST1           BIT(9)  /* slot 1 card present */
+#define  PCIECR_CLKEN           BIT(4)
+
 #define FAER            0x150
 #define USRGPIR         0x160
 /* 0x170 reserved */