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 /* 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 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 65