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