| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 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 | |
| 12 | #include <mach/hardware.h> |
| 13 | #include <mach/ixp4xx-regs.h> |
| 14 | |
| 15 | static struct map_desc ixp4xx_of_io_desc[] __initdata = { |
| 16 | /* |
| 17 | * This is needed for runtime system configuration checks, |
| 18 | * such as reading if hardware so-and-so is present. This |
| 19 | * could eventually be converted into a syscon once all boards |
| 20 | * are converted to device tree. |
| 21 | */ |
| 22 | { |
| 23 | .virtual = IXP4XX_EXP_CFG_BASE_VIRT, |
| 24 | .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS), |
| 25 | .length = SZ_4K, |
| 26 | .type = MT_DEVICE, |
| 27 | }, |
| 28 | #ifdef CONFIG_DEBUG_UART_8250 |
| 29 | /* This is needed for LL-debug/earlyprintk/debug-macro.S */ |
| 30 | { |
| 31 | .virtual = CONFIG_DEBUG_UART_VIRT, |
| 32 | .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS), |
| 33 | .length = SZ_4K, |
| 34 | .type = MT_DEVICE, |
| 35 | }, |
| 36 | #endif |
| 37 | }; |
| 38 | |
| 39 | static void __init ixp4xx_of_map_io(void) |
| 40 | { |
| 41 | iotable_init(ixp4xx_of_io_desc, ARRAY_SIZE(ixp4xx_of_io_desc)); |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * We handle 4 differen SoC families. These compatible strings are enough |
| 46 | * to provide the core so that different boards can add their more detailed |
| 47 | * specifics. |
| 48 | */ |
| 49 | static const char *ixp4xx_of_board_compat[] = { |
| 50 | "intel,ixp42x", |
| 51 | "intel,ixp43x", |
| 52 | "intel,ixp45x", |
| 53 | "intel,ixp46x", |
| 54 | NULL, |
| 55 | }; |
| 56 | |
| 57 | DT_MACHINE_START(IXP4XX_DT, "IXP4xx (Device Tree)") |
| 58 | .map_io = ixp4xx_of_map_io, |
| 59 | .dt_compat = ixp4xx_of_board_compat, |
| 60 | MACHINE_END |