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