mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 18:28:55 +00:00
d15e1926ff
For the purpose of this driver (activating bypass mode) t6000-dart and t8103-dart are fully compatible. Signed-off-by: Janne Grunau <j@jannau.net> Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
// 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
|
|
};
|