common.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Code commons to all DaVinci SoCs.
  4 *
  5 * Author: Mark A. Greer <mgreer@mvista.com>
  6 *
  7 * 2009 (c) MontaVista Software, Inc.
  8 */
  9#include <linux/module.h>
 10#include <linux/io.h>
 11#include <linux/etherdevice.h>
 12#include <linux/davinci_emac.h>
 13#include <linux/dma-mapping.h>
 14#include <linux/platform_data/davinci-cpufreq.h>
 15
 16#include <asm/tlb.h>
 17#include <asm/mach/map.h>
 18
 19#include "common.h"
 20#include "cputype.h"
 21
 22struct davinci_soc_info davinci_soc_info;
 23EXPORT_SYMBOL(davinci_soc_info);
 24
 25static int __init davinci_init_id(struct davinci_soc_info *soc_info)
 26{
 27	int			i;
 28	struct davinci_id	*dip;
 29	u8			variant;
 30	u16			part_no;
 31	void __iomem		*base;
 32
 33	base = ioremap(soc_info->jtag_id_reg, SZ_4K);
 34	if (!base) {
 35		pr_err("Unable to map JTAG ID register\n");
 36		return -ENOMEM;
 37	}
 38
 39	soc_info->jtag_id = __raw_readl(base);
 40	iounmap(base);
 41
 42	variant = (soc_info->jtag_id & 0xf0000000) >> 28;
 43	part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
 44
 45	for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
 46			i++, dip++)
 47		/* Don't care about the manufacturer right now */
 48		if ((dip->part_no == part_no) && (dip->variant == variant)) {
 49			soc_info->cpu_id = dip->cpu_id;
 50			pr_info("DaVinci %s variant 0x%x\n", dip->name,
 51					dip->variant);
 52			return 0;
 53		}
 54
 55	pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
 56	return -EINVAL;
 57}
 58
 59void __init davinci_common_init(const struct davinci_soc_info *soc_info)
 60{
 61	int ret;
 62
 63	if (!soc_info) {
 64		ret = -EINVAL;
 65		goto err;
 66	}
 67
 68	memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
 69
 70	if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
 71		iotable_init(davinci_soc_info.io_desc,
 72				davinci_soc_info.io_desc_num);
 73
 74	/*
 75	 * Normally devicemaps_init() would flush caches and tlb after
 76	 * mdesc->map_io(), but we must also do it here because of the CPU
 77	 * revision check below.
 78	 */
 79	local_flush_tlb_all();
 80	flush_cache_all();
 81
 82	/*
 83	 * We want to check CPU revision early for cpu_is_xxxx() macros.
 84	 * IO space mapping must be initialized before we can do that.
 85	 */
 86	ret = davinci_init_id(&davinci_soc_info);
 87	if (ret < 0)
 88		goto err;
 89
 90
 91	return;
 92
 93err:
 94	panic("davinci_common_init: SoC Initialization failed\n");
 95}
 96
 97void __init davinci_init_late(void)
 98{
 99	davinci_cpufreq_init();
100}