rockchip: add iomem show interface

this is mainly for debug.

Change-Id: Ied842841f09780c11092624fb602a3f3723469c3
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

arch/arm/mach-rockchip/Makefile

@@ -23,6 +23,7 @@ ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 obj-y += boot_mode.o
 obj-y += board.o
 obj-y += chip_info.o
+obj-y += iomem.o
 
 obj-$(CONFIG_ROCKCHIP_CRC) += rockchip_crc.o
 obj-$(CONFIG_ROCKCHIP_SMCCC) += rockchip_smccc.o

arch/arm/mach-rockchip/iomem.c

@@ -0,0 +1,86 @@
+/*
+ * SPDX-License-Identifier:     GPL-2.0+
+ *
+ * (C) Copyright 2018 Rockchip Electronics Co., Ltd
+ *
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+
+void iomem_show(const char *label, unsigned long base, size_t start, size_t end)
+{
+	unsigned long val, offset = start, nr = 0;
+
+	if (label)
+		printf("%s:\n", label);
+
+	printf("%08lx:  ", base + offset);
+	for (offset = start; offset <= end; offset += 0x04) {
+		if (nr >= 4) {
+			printf("\n%08lx:  ", base + offset);
+			nr = 0;
+		}
+		val = readl((void __iomem *)base + offset);
+		printf("%08lx ", val);
+		nr++;
+	}
+	printf("\n");
+}
+
+void iomem_show_by_compatible(const char *compat, size_t start, size_t end)
+{
+	const void *fdt = gd->fdt_blob;
+	const char *compatible;
+	fdt_addr_t addr;
+	int offset;
+
+	if (!compat)
+		return;
+
+	for (offset = fdt_next_node(fdt, 0, NULL);
+	     offset >= 0;
+	     offset = fdt_next_node(fdt, offset, NULL)) {
+		compatible = fdt_getprop(fdt, offset, "compatible", NULL);
+		if (!compatible)
+			continue;
+
+		if (strstr(compatible, compat)) {
+			addr = fdtdec_get_addr_size_auto_noparent(fdt, offset,
+							"reg", 0, NULL, false);
+			compatible = fdt_getprop(fdt, offset, "compatible",
+						 NULL);
+			iomem_show(compatible, addr, start, end);
+			break;
+		}
+	}
+
+	printf("\n");
+}
+
+static int do_iomem_by_compatible(cmd_tbl_t *cmdtp, int flag, int argc,
+				  char *const argv[])
+{
+	size_t start, end;
+	const char *compat;
+
+	if (argc != 4)
+		return CMD_RET_USAGE;
+
+	compat = argv[1];
+	start = simple_strtoul(argv[2], NULL, 0);
+	end = simple_strtoul(argv[3], NULL, 0);
+
+	iomem_show_by_compatible(compat, start, end);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	iomem,		4,	1,	do_iomem_by_compatible,
+	"Show iomem data by device compatible",
+	"iomem <compatible> <start offset>  <end offset>\n"
+	"  eg: iomem -grf 0x0 0x200"
+);

include/iomem.h

@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier:     GPL-2.0+
+ *
+ * (C) Copyright 2018 Rockchip Electronics Co., Ltd
+ *
+ */
+
+#ifndef _ROCKCHIP_IOMEM_H_
+#define _ROCKCHIP_IOMEM_H_
+
+/**
+ * iomem_show() - Show iomem data. Usually for peripheral registers.
+ *
+ * @lable:	Title to show
+ * @base:	Base address of iomem
+ * @start:	Start offset
+ * @end:	End offset
+ */
+void iomem_show(const char *label, unsigned long base, size_t start, size_t end);
+
+/**
+ * iomem_show_by_compatible() - Show iomem data and auto find base address by
+ *				compabile(sub string match).
+ *
+ * @compat:	Compatible name, sub string match.
+ * @start:	Start offset
+ * @end:	End offset
+ *
+ * eg: iomem_show_by_compatible("-grf", 0x0, 0x200);
+ *     first node that contains "-grf" will be dump.
+ *
+ */
+void iomem_show_by_compatible(const char *compat, size_t start, size_t end);
+
+#endif