1 files changed, 99 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/common.c b/arch/arm/mach-davinci/common.c
new file mode 100644
index 000000000..c1ce6b2a8
--- /dev/null
+++ b/arch/arm/mach-davinci/common.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Code commons to all DaVinci SoCs.
+ *
+ * Author: Mark A. Greer <mgreer@mvista.com>
+ *
+ * 2009 (c) MontaVista Software, Inc.
+ */
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/etherdevice.h>
+#include <linux/davinci_emac.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/tlb.h>
+#include <asm/mach/map.h>
+
+#include "common.h"
+#include "cputype.h"
+
+struct davinci_soc_info davinci_soc_info;
+EXPORT_SYMBOL(davinci_soc_info);
+
+static int __init davinci_init_id(struct davinci_soc_info *soc_info)
+{
+	int			i;
+	struct davinci_id	*dip;
+	u8			variant;
+	u16			part_no;
+	void __iomem		*base;
+
+	base = ioremap(soc_info->jtag_id_reg, SZ_4K);
+	if (!base) {
+		pr_err("Unable to map JTAG ID register\n");
+		return -ENOMEM;
+	}
+
+	soc_info->jtag_id = __raw_readl(base);
+	iounmap(base);
+
+	variant = (soc_info->jtag_id & 0xf0000000) >> 28;
+	part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
+
+	for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
+			i++, dip++)
+		/* Don't care about the manufacturer right now */
+		if ((dip->part_no == part_no) && (dip->variant == variant)) {
+			soc_info->cpu_id = dip->cpu_id;
+			pr_info("DaVinci %s variant 0x%x\n", dip->name,
+					dip->variant);
+			return 0;
+		}
+
+	pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
+	return -EINVAL;
+}
+
+void __init davinci_common_init(const struct davinci_soc_info *soc_info)
+{
+	int ret;
+
+	if (!soc_info) {
+		ret = -EINVAL;
+		goto err;
+	}
+
+	memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
+
+	if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
+		iotable_init(davinci_soc_info.io_desc,
+				davinci_soc_info.io_desc_num);
+
+	/*
+	 * Normally devicemaps_init() would flush caches and tlb after
+	 * mdesc->map_io(), but we must also do it here because of the CPU
+	 * revision check below.
+	 */
+	local_flush_tlb_all();
+	flush_cache_all();
+
+	/*
+	 * We want to check CPU revision early for cpu_is_xxxx() macros.
+	 * IO space mapping must be initialized before we can do that.
+	 */
+	ret = davinci_init_id(&davinci_soc_info);
+	if (ret < 0)
+		goto err;
+
+
+	return;
+
+err:
+	panic("davinci_common_init: SoC Initialization failed\n");
+}
+
+void __init davinci_init_late(void)
+{
+	davinci_cpufreq_init();
+}