61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <dm.h>
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#include <asm/io.h>
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#define DART_PARAMS2 0x0004
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#define DART_PARAMS2_BYPASS_SUPPORT BIT(0)
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#define DART_TLB_OP 0x0020
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#define DART_TLB_OP_OPMASK (0xfff << 20)
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#define DART_TLB_OP_FLUSH (0x001 << 20)
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#define DART_TLB_OP_BUSY BIT(2)
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#define DART_TLB_OP_SIDMASK 0x0034
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#define DART_ERROR_STATUS 0x0040
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#define DART_TCR(sid) (0x0100 + 4 * (sid))
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#define DART_TCR_TRANSLATE_ENABLE BIT(7)
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#define DART_TCR_BYPASS_DART BIT(8)
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#define DART_TCR_BYPASS_DAPF BIT(12)
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#define DART_TTBR(sid, idx) (0x0200 + 16 * (sid) + 4 * (idx))
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#define DART_TTBR_VALID BIT(31)
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#define DART_TTBR_SHIFT 12
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static int apple_dart_probe(struct udevice *dev)
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{
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void *base;
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int sid, i;
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base = dev_read_addr_ptr(dev);
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if (!base)
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return -EINVAL;
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u32 params2 = readl(base + DART_PARAMS2);
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if (params2 & DART_PARAMS2_BYPASS_SUPPORT) {
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for (sid = 0; sid < 16; sid++) {
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writel(DART_TCR_BYPASS_DART | DART_TCR_BYPASS_DAPF,
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base + DART_TCR(sid));
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for (i = 0; i < 4; i++)
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writel(0, base + DART_TTBR(sid, i));
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}
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}
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return 0;
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}
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static const struct udevice_id apple_dart_ids[] = {
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{ .compatible = "apple,t8103-dart" },
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{ .compatible = "apple,t6000-dart" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(apple_dart) = {
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.name = "apple_dart",
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.id = UCLASS_IOMMU,
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.of_match = apple_dart_ids,
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.probe = apple_dart_probe
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};
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