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 <[email protected]>
   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
  22 struct davinci_soc_info davinci_soc_info;
  23 EXPORT_SYMBOL(davinci_soc_info);
  24
  25 static 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
  59 void __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
  93 err:
  94         panic("davinci_common_init: SoC Initialization failed\n");
  95 }
  96
  97 void __init davinci_init_late(void)
  98 {
  99         davinci_cpufreq_init();
 100 }