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https://github.com/antonblanchard/microwatt.git
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573b6b4bc4
This changes the SoC interconnect such that the main 64-bit wishbone out of the processor is first split between only 3 slaves (BRAM, DRAM and a general "IO" bus) instead of all the slaves in the SoC. The IO bus leg is then latched and down-converted to 32 bits data width, before going through a second address decoder for the various IO devices. This significantly reduces routing and timing pressure on the main bus, allowing to get rid of frequent timing violations when synthetizing on small'ish FPGAs such as the Artix-7 35T found on the original Arty board. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
#ifndef __MICROWATT_SOC_H
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#define __MICROWATT_SOC_H
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/*
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* Microwatt SoC memory map
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*/
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#define MEMORY_BASE 0x00000000 /* "Main" memory alias, either BRAM or DRAM */
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#define DRAM_BASE 0x40000000 /* DRAM if present */
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#define BRAM_BASE 0x80000000 /* Internal BRAM */
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#define SYSCON_BASE 0xc0000000 /* System control regs */
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#define UART_BASE 0xc0002000 /* UART */
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#define XICS_BASE 0xc0004000 /* Interrupt controller */
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#define DRAM_CTRL_BASE 0xc0100000 /* LiteDRAM control registers */
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#define DRAM_INIT_BASE 0xf0000000 /* Internal DRAM init firmware */
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/*
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* Register definitions for the syscon registers
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*/
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#define SYS_REG_SIGNATURE 0x00
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#define SYS_REG_INFO 0x08
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#define SYS_REG_INFO_HAS_UART (1ull << 0)
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#define SYS_REG_INFO_HAS_DRAM (1ull << 1)
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#define SYS_REG_BRAMINFO 0x10
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#define SYS_REG_DRAMINFO 0x18
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#define SYS_REG_CLKINFO 0x20
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#define SYS_REG_CTRL 0x28
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#define SYS_REG_CTRL_DRAM_AT_0 (1ull << 0)
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#define SYS_REG_CTRL_CORE_RESET (1ull << 1)
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#define SYS_REG_CTRL_SOC_RESET (1ull << 2)
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/*
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* Register definitions for the potato UART
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*/
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#define POTATO_CONSOLE_TX 0x00
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#define POTATO_CONSOLE_RX 0x08
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#define POTATO_CONSOLE_STATUS 0x10
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#define POTATO_CONSOLE_STATUS_RX_EMPTY 0x01
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#define POTATO_CONSOLE_STATUS_TX_EMPTY 0x02
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#define POTATO_CONSOLE_STATUS_RX_FULL 0x04
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#define POTATO_CONSOLE_STATUS_TX_FULL 0x08
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#define POTATO_CONSOLE_CLOCK_DIV 0x18
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#define POTATO_CONSOLE_IRQ_EN 0x20
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#endif /* __MICROWATT_SOC_H */
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