projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9540724c LW |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* | |
| 3 | * IXP4xx Device Tree boot support | |
| 4 | */ | |
| 5 | #include <linux/kernel.h> | |
| 6 | #include <linux/init.h> | |
| 7 | #include <linux/io.h> | |
| 8 | ||
| 9 | #include <asm/mach/arch.h> | |
| 10 | #include <asm/mach/map.h> | |
| 11 | ||
| 713ce38d LW |
12 | /* |
| 13 | * These are the only fixed phys to virt mappings we ever need | |
| 14 | * we put it right after the UART mapping at 0xffc80000-0xffc81fff | |
| 15 | */ | |
| 16 | #define IXP4XX_EXP_CFG_BASE_PHYS 0xC4000000 | |
| 17 | #define IXP4XX_EXP_CFG_BASE_VIRT 0xFEC14000 | |
| 9540724c LW |
18 | |
| 19 | static struct map_desc ixp4xx_of_io_desc[] __initdata = { | |
| 20 | /* | |
| 21 | * This is needed for runtime system configuration checks, | |
| 22 | * such as reading if hardware so-and-so is present. This | |
| 23 | * could eventually be converted into a syscon once all boards | |
| 24 | * are converted to device tree. | |
| 25 | */ | |
| 26 | { | |
| 27 | .virtual = IXP4XX_EXP_CFG_BASE_VIRT, | |
| 28 | .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS), | |
| 29 | .length = SZ_4K, | |
| 30 | .type = MT_DEVICE, | |
| 31 | }, | |
| 32 | #ifdef CONFIG_DEBUG_UART_8250 | |
| 33 | /* This is needed for LL-debug/earlyprintk/debug-macro.S */ | |
| 34 | { | |
| 35 | .virtual = CONFIG_DEBUG_UART_VIRT, | |
| 36 | .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS), | |
| 37 | .length = SZ_4K, | |
| 38 | .type = MT_DEVICE, | |
| 39 | }, | |
| 40 | #endif | |
| 41 | }; | |
| 42 | ||
| 43 | static void __init ixp4xx_of_map_io(void) | |
| 44 | { | |
| 45 | iotable_init(ixp4xx_of_io_desc, ARRAY_SIZE(ixp4xx_of_io_desc)); | |
| 46 | } | |
| 47 | ||
| 48 | /* | |
| 49 | * We handle 4 differen SoC families. These compatible strings are enough | |
| 50 | * to provide the core so that different boards can add their more detailed | |
| 51 | * specifics. | |
| 52 | */ | |
| 53 | static const char *ixp4xx_of_board_compat[] = { | |
| 54 | "intel,ixp42x", | |
| 55 | "intel,ixp43x", | |
| 56 | "intel,ixp45x", | |
| 57 | "intel,ixp46x", | |
| 58 | NULL, | |
| 59 | }; | |
| 60 | ||
| 61 | DT_MACHINE_START(IXP4XX_DT, "IXP4xx (Device Tree)") | |
| 62 | .map_io = ixp4xx_of_map_io, | |
| 63 | .dt_compat = ixp4xx_of_board_compat, | |
| 64 | MACHINE_END |