| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * SDK7786 FPGA Support. |
| * |
| * Copyright (C) 2010 Paul Mundt |
| */ |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/bcd.h> |
| #include <mach/fpga.h> |
| #include <linux/sizes.h> |
| |
| #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; |
| |
| void __init sdk7786_fpga_init(void) |
| { |
| u16 version, date; |
| |
| sdk7786_fpga_base = sdk7786_fpga_probe(); |
| if (unlikely(!sdk7786_fpga_base)) { |
| panic("FPGA detection failed.\n"); |
| return; |
| } |
| |
| version = fpga_read_reg(FPGAVR); |
| date = fpga_read_reg(FPGADR); |
| |
| pr_info("\tFPGA version:\t%d.%d (built on %d/%d/%d)\n", |
| bcd2bin(version >> 8) & 0xf, bcd2bin(version & 0xf), |
| ((date >> 12) & 0xf) + 2000, |
| (date >> 8) & 0xf, bcd2bin(date & 0xff)); |
| } |