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Introduce the AST1040 I2C controller model. The AST1040 I2C controller is compatible with the AST2700 I2C controller, including DMA support and the 64-bit DMA address registers. Set has_dma64 so firmware can access the high address register and program it to zero, as the CM4 CPU only supports 32-bit addressing. AST1040 has 14 I2C buses and its HyperRAM is limited to 16 MiB, so restrict the DMA low address mask to 0x00ffffff. Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20260603040027.938816-8-jamin_lin@aspeedtech.com Signed-off-by: Cédric Le Goater <clg@redhat.com>