1 // SPDX-License-Identifier: GPL-2.0
3 * IXP4xx Device Tree boot support
5 #include <linux/kernel.h>
6 #include <linux/init.h>
9 #include <asm/mach/arch.h>
10 #include <asm/mach/map.h>
12 #include <mach/hardware.h>
13 #include <mach/ixp4xx-regs.h>
15 static struct map_desc ixp4xx_of_io_desc[] __initdata = {
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.
23 .virtual = IXP4XX_EXP_CFG_BASE_VIRT,
24 .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
28 #ifdef CONFIG_DEBUG_UART_8250
29 /* This is needed for LL-debug/earlyprintk/debug-macro.S */
31 .virtual = CONFIG_DEBUG_UART_VIRT,
32 .pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
39 static void __init ixp4xx_of_map_io(void)
41 iotable_init(ixp4xx_of_io_desc, ARRAY_SIZE(ixp4xx_of_io_desc));
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
49 static const char *ixp4xx_of_board_compat[] = {
57 DT_MACHINE_START(IXP4XX_DT, "IXP4xx (Device Tree)")
58 .map_io = ixp4xx_of_map_io,
59 .dt_compat = ixp4xx_of_board_compat,