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-rw-r--r--arch/sh/boards/mach-sdk7786/fpga.c43
1 files changed, 39 insertions, 4 deletions
diff --git a/arch/sh/boards/mach-sdk7786/fpga.c b/arch/sh/boards/mach-sdk7786/fpga.c
index 99f903c8b23..3e4ec66a041 100644
--- a/arch/sh/boards/mach-sdk7786/fpga.c
+++ b/arch/sh/boards/mach-sdk7786/fpga.c
@@ -11,9 +11,44 @@
#include <linux/io.h>
#include <linux/bcd.h>
#include <mach/fpga.h>
+#include <asm/sizes.h>
-#define FPGA_REGS_BASE 0x07fff800
-#define FPGA_REGS_SIZE 0x490
+#define FPGA_REGS_OFFSET 0x03fff800
+#define FPGA_REGS_SIZE 0x490
+
+/*
+ * The FPGA can be mapped in any of the generally available areas,
+ * so we attempt to scan for it using the fixed SRSTR read magic.
+ *
+ * Once the FPGA is located, the rest of the mapping data for the other
+ * components can be determined dynamically from its section mapping
+ * registers.
+ */
+static void __iomem *sdk7786_fpga_probe(void)
+{
+ unsigned long area;
+ void __iomem *base;
+
+ /*
+ * Iterate over all of the areas where the FPGA could be mapped.
+ * The possible range is anywhere from area 0 through 6, area 7
+ * is reserved.
+ */
+ for (area = PA_AREA0; area < PA_AREA7; area += SZ_64M) {
+ base = ioremap_nocache(area + FPGA_REGS_OFFSET, FPGA_REGS_SIZE);
+ if (!base) {
+ /* Failed to remap this area, move along. */
+ continue;
+ }
+
+ if (ioread16(base + SRSTR) == SRSTR_MAGIC)
+ return base; /* Found it! */
+
+ iounmap(base);
+ }
+
+ return NULL;
+}
void __iomem *sdk7786_fpga_base;
@@ -21,9 +56,9 @@ void __init sdk7786_fpga_init(void)
{
u16 version, date;
- sdk7786_fpga_base = ioremap_nocache(FPGA_REGS_BASE, FPGA_REGS_SIZE);
+ sdk7786_fpga_base = sdk7786_fpga_probe();
if (unlikely(!sdk7786_fpga_base)) {
- panic("FPGA remapping failed.\n");
+ panic("FPGA detection failed.\n");
return;
}