From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/sh/boards/mach-sdk7786/fpga.c | 69 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 arch/sh/boards/mach-sdk7786/fpga.c (limited to 'arch/sh/boards/mach-sdk7786/fpga.c') diff --git a/arch/sh/boards/mach-sdk7786/fpga.c b/arch/sh/boards/mach-sdk7786/fpga.c new file mode 100644 index 000000000..a37e1e88c --- /dev/null +++ b/arch/sh/boards/mach-sdk7786/fpga.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SDK7786 FPGA Support. + * + * Copyright (C) 2010 Paul Mundt + */ +#include +#include +#include +#include +#include + +#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(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)); +} -- cgit v1.2.3