| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * IXP4xx Device Tree boot support |
| */ |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/io.h> |
| |
| #include <asm/mach/arch.h> |
| #include <asm/mach/map.h> |
| |
| /* |
| * These are the only fixed phys to virt mappings we ever need |
| * we put it right after the UART mapping at 0xffc80000-0xffc81fff |
| */ |
| #define IXP4XX_EXP_CFG_BASE_PHYS 0xC4000000 |
| #define IXP4XX_EXP_CFG_BASE_VIRT 0xFEC14000 |
| |
| static struct map_desc ixp4xx_of_io_desc[] __initdata = { |
| /* |
| * This is needed for runtime system configuration checks, |
| * such as reading if hardware so-and-so is present. This |
| * could eventually be converted into a syscon once all boards |
| * are converted to device tree. |
| */ |
| { |
| .virtual = IXP4XX_EXP_CFG_BASE_VIRT, |
| .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS), |
| .length = SZ_4K, |
| .type = MT_DEVICE, |
| }, |
| #ifdef CONFIG_DEBUG_UART_8250 |
| /* This is needed for LL-debug/earlyprintk/debug-macro.S */ |
| { |
| .virtual = CONFIG_DEBUG_UART_VIRT, |
| .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS), |
| .length = SZ_4K, |
| .type = MT_DEVICE, |
| }, |
| #endif |
| }; |
| |
| static void __init ixp4xx_of_map_io(void) |
| { |
| iotable_init(ixp4xx_of_io_desc, ARRAY_SIZE(ixp4xx_of_io_desc)); |
| } |
| |
| /* |
| * We handle 4 differen SoC families. These compatible strings are enough |
| * to provide the core so that different boards can add their more detailed |
| * specifics. |
| */ |
| static const char *ixp4xx_of_board_compat[] = { |
| "intel,ixp42x", |
| "intel,ixp43x", |
| "intel,ixp45x", |
| "intel,ixp46x", |
| NULL, |
| }; |
| |
| DT_MACHINE_START(IXP4XX_DT, "IXP4xx (Device Tree)") |
| .map_io = ixp4xx_of_map_io, |
| .dt_compat = ixp4xx_of_board_compat, |
| MACHINE_END |
