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-rw-r--r--arch/arm/mach-davinci/common.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/common.c b/arch/arm/mach-davinci/common.c
new file mode 100644
index 0000000000..7bc7018688
--- /dev/null
+++ b/arch/arm/mach-davinci/common.c
@@ -0,0 +1,100 @@
+// 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 <linux/platform_data/davinci-cpufreq.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();
+}