diff options
| -rw-r--r-- | arch/sh/boards/mach-sdk7786/fpga.c | 43 | ||||
| -rw-r--r-- | arch/sh/include/cpu-sh4/cpu/addrspace.h | 9 | ||||
| -rw-r--r-- | arch/sh/include/mach-sdk7786/mach/fpga.h | 2 |
3 files changed, 50 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; } diff --git a/arch/sh/include/cpu-sh4/cpu/addrspace.h b/arch/sh/include/cpu-sh4/cpu/addrspace.h index a3fa733c1c7..d51da25da72 100644 --- a/arch/sh/include/cpu-sh4/cpu/addrspace.h +++ b/arch/sh/include/cpu-sh4/cpu/addrspace.h @@ -28,6 +28,15 @@ #define P4SEG_TLB_DATA 0xf7000000 #define P4SEG_REG_BASE 0xff000000 +#define PA_AREA0 0x00000000 +#define PA_AREA1 0x04000000 +#define PA_AREA2 0x08000000 +#define PA_AREA3 0x0c000000 +#define PA_AREA4 0x10000000 +#define PA_AREA5 0x14000000 +#define PA_AREA6 0x18000000 +#define PA_AREA7 0x1c000000 + #define PA_AREA5_IO 0xb4000000 /* Area 5 IO Memory */ #define PA_AREA6_IO 0xb8000000 /* Area 6 IO Memory */ diff --git a/arch/sh/include/mach-sdk7786/mach/fpga.h b/arch/sh/include/mach-sdk7786/mach/fpga.h index a85d9853d34..2120d67dec7 100644 --- a/arch/sh/include/mach-sdk7786/mach/fpga.h +++ b/arch/sh/include/mach-sdk7786/mach/fpga.h @@ -6,6 +6,8 @@ #include <linux/bitops.h> #define SRSTR 0x000 +#define SRSTR_MAGIC 0x1971 /* Fixed magical read value */ + #define INTASR 0x010 #define INTAMR 0x020 #define MODSWR 0x030 |