Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[sfrench/cifs-2.6.git] / arch / arm / mach-ixp4xx / ixp4xx-of.c
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