[ARM] orion5x: TS-78xx support for 'hotplug' of FPGA devices

the FPGA on the TS-7800 provides access to a number of devices
and so we have to be careful when reprogramming it.  As we
are effectively turning a bus off/on we have to inform the
kernel that it should stop using anything provided by the
FPGA (currently only the RTC however the NAND, LCD, etc is
to come) before it's reprogrammed.

Once reprogramed, we can tell the kernel to (re)enable things
by checking the FPGA ID against a lookup table for what a
particular FPGA bitstream can provide.

Signed-off-by: Alexander Clouter <alex@digriz.org.uk>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/arm/mach-orion5x/ts78xx-fpga.h b/arch/arm/mach-orion5x/ts78xx-fpga.h
new file mode 100644
index 0000000..0b8e30f
--- /dev/null
+++ b/arch/arm/mach-orion5x/ts78xx-fpga.h
@@ -0,0 +1,27 @@
+#define FPGAID(_magic, _rev) ((_magic << 8) + _rev)
+
+/*
+ * get yer id's from http://ts78xx.digriz.org.uk/
+ * do *not* make up your own or 'borrow' any!
+ */
+enum fpga_ids {
+	/* Technologic Systems */
+	TS7800_REV_B = FPGAID(0x00b480, 0x03),
+};
+
+struct fpga_device {
+	unsigned		present:1;
+	unsigned		init:1;
+};
+
+struct fpga_devices {
+	/* Technologic Systems */
+	struct fpga_device 	ts_rtc;
+};
+
+struct ts78xx_fpga_data {
+	unsigned int		id;
+	int			state;
+
+	struct fpga_devices	supports;
+};