arch/arm/mach-davinci/common.c

   1 /*
   2  * Code commons to all DaVinci SoCs.
   3  *
   4  * Author: Mark A. Greer <mgreer@mvista.com>
   5  *
   6  * 2009 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/io.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/davinci_emac.h>
  15 #include <linux/dma-mapping.h>
  16
  17 #include <asm/tlb.h>
  18 #include <asm/mach/map.h>
  19
  20 #include <mach/common.h>
  21 #include <mach/cputype.h>
  22
  23 struct davinci_soc_info davinci_soc_info;
  24 EXPORT_SYMBOL(davinci_soc_info);
  25
  26 static int __init davinci_init_id(struct davinci_soc_info *soc_info)
  27 {
  28         int                     i;
  29         struct davinci_id       *dip;
  30         u8                      variant;
  31         u16                     part_no;
  32         void __iomem            *base;
  33
  34         base = ioremap(soc_info->jtag_id_reg, SZ_4K);
  35         if (!base) {
  36                 pr_err("Unable to map JTAG ID register\n");
  37                 return -ENOMEM;
  38         }
  39
  40         soc_info->jtag_id = __raw_readl(base);
  41         iounmap(base);
  42
  43         variant = (soc_info->jtag_id & 0xf0000000) >> 28;
  44         part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
  45
  46         for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
  47                         i++, dip++)
  48                 /* Don't care about the manufacturer right now */
  49                 if ((dip->part_no == part_no) && (dip->variant == variant)) {
  50                         soc_info->cpu_id = dip->cpu_id;
  51                         pr_info("DaVinci %s variant 0x%x\n", dip->name,
  52                                         dip->variant);
  53                         return 0;
  54                 }
  55
  56         pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
  57         return -EINVAL;
  58 }
  59
  60 void __init davinci_common_init(const struct davinci_soc_info *soc_info)
  61 {
  62         int ret;
  63
  64         if (!soc_info) {
  65                 ret = -EINVAL;
  66                 goto err;
  67         }
  68
  69         memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
  70
  71         if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
  72                 iotable_init(davinci_soc_info.io_desc,
  73                                 davinci_soc_info.io_desc_num);
  74
  75         /*
  76          * Normally devicemaps_init() would flush caches and tlb after
  77          * mdesc->map_io(), but we must also do it here because of the CPU
  78          * revision check below.
  79          */
  80         local_flush_tlb_all();
  81         flush_cache_all();
  82
  83         /*
  84          * We want to check CPU revision early for cpu_is_xxxx() macros.
  85          * IO space mapping must be initialized before we can do that.
  86          */
  87         ret = davinci_init_id(&davinci_soc_info);
  88         if (ret < 0)
  89                 goto err;
  90
  91
  92         return;
  93
  94 err:
  95         panic("davinci_common_init: SoC Initialization failed\n");
  96 }
  97
  98 void __init davinci_init_late(void)
  99 {
 100         davinci_cpufreq_init();
 101 }