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| author | Siddharth Vadapalli <[email protected]> | 2026-02-27 17:28:29 +0530 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2026-03-09 09:35:18 -0600 |
| commit | d62f1c98c5e78f4092510992f8174c284e3d1778 (patch) | |
| tree | ccdd11feaa920c0ca646db1ea3ed52fb54e42645 /doc/develop/bootstd/script.rst | |
| parent | b26cc03b7cecaabdb306c2f68eebde764161a545 (diff) | |
arm: mach-k3: arm64-mmu: add mapping for PCIe 4 GB Address Windows
The PCIe Controllers in the K3 SoCs have 4 GB Address Windows in the
64-bit address space to map System (CPU) Addresses to PCIe Bus Addresses.
The physical addresses for these Address Windows across PCIe instances
across SoCs is as follows:
+--------+----------------+----------------+----------------+----------------+
| SoC | PCIe0 | PCIe1 | PCIe2 | PCIe3 |
+--------+----------------+----------------+----------------+----------------+
| AM64 | 0x6_0000_0000 | NA | NA | NA |
| J722S | 0x6_0000_0000 | NA | NA | NA |
| AM68 | NA | 0x41_0000_0000 | NA | NA |
| J7200 | NA | 0x41_0000_0000 | NA | NA |
| J721S2 | NA | 0x41_0000_0000 | NA | NA |
| J742S2 | 0x40_0000_0000 | 0x41_0000_0000 | NA | NA |
| AM69 | 0x40_0000_0000 | 0x41_0000_0000 | 0x42_0000_0000 | 0x43_0000_0000 |
| J721E | 0x40_0000_0000 | 0x41_0000_0000 | 0x42_0000_0000 | 0x43_0000_0000 |
| J784S4 | 0x40_0000_0000 | 0x41_0000_0000 | 0x42_0000_0000 | 0x43_0000_0000 |
+--------+----------------+----------------+----------------+----------------+
Two regions for a 1:1 mapping from virtual addresses to physical addresses
catering to all of the above will be required, which are:
1. For AM64 and J722S SoCs
=> Start: 0x6_0000_0000 Size: 0x1_0000_0000
2. For AM68, AM69, J7200, J721E, J721S2, J742S2 and J784S4 SoCs
=> Start: 0x40_0000_0000 Size: 0x4_0000_0000
Since the 'Flash Peripherals' region from 0x5_0000_0000 to 0x8_7FFF_FFFF
includes the mapping for AM64 and J722S SoCs, only the second region
mentioned above needs to be added.
Hence, add the region to support 64-bit address space for PCIe.
Signed-off-by: Siddharth Vadapalli <[email protected]>
Fixes: 79f3e77133bd ("Subtree merge tag 'v6.16-dts' of dts repo [1] into dts/upstream")
Diffstat (limited to 'doc/develop/bootstd/script.rst')
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