70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* SDK7786 FPGA Support.
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*
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* Copyright (C) 2010 Paul Mundt
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/bcd.h>
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#include <mach/fpga.h>
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#include <linux/sizes.h>
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#define FPGA_REGS_OFFSET 0x03fff800
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#define FPGA_REGS_SIZE 0x490
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/*
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* The FPGA can be mapped in any of the generally available areas,
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* so we attempt to scan for it using the fixed SRSTR read magic.
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*
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* Once the FPGA is located, the rest of the mapping data for the other
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* components can be determined dynamically from its section mapping
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* registers.
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*/
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static void __iomem *sdk7786_fpga_probe(void)
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{
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unsigned long area;
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void __iomem *base;
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/*
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* Iterate over all of the areas where the FPGA could be mapped.
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* The possible range is anywhere from area 0 through 6, area 7
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* is reserved.
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*/
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for (area = PA_AREA0; area < PA_AREA7; area += SZ_64M) {
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base = ioremap(area + FPGA_REGS_OFFSET, FPGA_REGS_SIZE);
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if (!base) {
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/* Failed to remap this area, move along. */
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continue;
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}
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if (ioread16(base + SRSTR) == SRSTR_MAGIC)
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return base; /* Found it! */
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iounmap(base);
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}
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return NULL;
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}
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void __iomem *sdk7786_fpga_base;
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void __init sdk7786_fpga_init(void)
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{
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u16 version, date;
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sdk7786_fpga_base = sdk7786_fpga_probe();
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if (unlikely(!sdk7786_fpga_base)) {
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panic("FPGA detection failed.\n");
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return;
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}
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version = fpga_read_reg(FPGAVR);
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date = fpga_read_reg(FPGADR);
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pr_info("\tFPGA version:\t%d.%d (built on %d/%d/%d)\n",
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bcd2bin(version >> 8) & 0xf, bcd2bin(version & 0xf),
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((date >> 12) & 0xf) + 2000,
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(date >> 8) & 0xf, bcd2bin(date & 0xff));
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}
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