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