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
  16 #include <asm/tlb.h>
  17 #include <asm/mach/map.h>
  18
  19 #include <mach/common.h>
  20 #include <mach/cputype.h>
  21
  22 #include "clock.h"
  23
  24 struct davinci_soc_info davinci_soc_info;
  25 EXPORT_SYMBOL(davinci_soc_info);
  26
  27 void __iomem *davinci_intc_base;
  28 int davinci_intc_type;
  29
  30 void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context)
  31 {
  32         char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
  33         off_t offset = (off_t)context;
  34
  35         /* Read MAC addr from EEPROM */
  36         if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
  37                 pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
  38 }
  39
  40 static int __init davinci_init_id(struct davinci_soc_info *soc_info)
  41 {
  42         int                     i;
  43         struct davinci_id       *dip;
  44         u8                      variant;
  45         u16                     part_no;
  46         void __iomem            *base;
  47
  48         base = ioremap(soc_info->jtag_id_reg, SZ_4K);
  49         if (!base) {
  50                 pr_err("Unable to map JTAG ID register\n");
  51                 return -ENOMEM;
  52         }
  53
  54         soc_info->jtag_id = __raw_readl(base);
  55         iounmap(base);
  56
  57         variant = (soc_info->jtag_id & 0xf0000000) >> 28;
  58         part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
  59
  60         for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
  61                         i++, dip++)
  62                 /* Don't care about the manufacturer right now */
  63                 if ((dip->part_no == part_no) && (dip->variant == variant)) {
  64                         soc_info->cpu_id = dip->cpu_id;
  65                         pr_info("DaVinci %s variant 0x%x\n", dip->name,
  66                                         dip->variant);
  67                         return 0;
  68                 }
  69
  70         pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
  71         return -EINVAL;
  72 }
  73
  74 void __init davinci_common_init(struct davinci_soc_info *soc_info)
  75 {
  76         int ret;
  77
  78         if (!soc_info) {
  79                 ret = -EINVAL;
  80                 goto err;
  81         }
  82
  83         memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
  84
  85         if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
  86                 iotable_init(davinci_soc_info.io_desc,
  87                                 davinci_soc_info.io_desc_num);
  88
  89         /*
  90          * Normally devicemaps_init() would flush caches and tlb after
  91          * mdesc->map_io(), but we must also do it here because of the CPU
  92          * revision check below.
  93          */
  94         local_flush_tlb_all();
  95         flush_cache_all();
  96
  97         if (!davinci_soc_info.reset)
  98                 davinci_soc_info.reset = davinci_watchdog_reset;
  99
 100         /*
 101          * We want to check CPU revision early for cpu_is_xxxx() macros.
 102          * IO space mapping must be initialized before we can do that.
 103          */
 104         ret = davinci_init_id(&davinci_soc_info);
 105         if (ret < 0)
 106                 goto err;
 107
 108         if (davinci_soc_info.cpu_clks) {
 109                 ret = davinci_clk_init(davinci_soc_info.cpu_clks);
 110
 111                 if (ret != 0)
 112                         goto err;
 113         }
 114
 115         return;
 116
 117 err:
 118         panic("davinci_common_init: SoC Initialization failed\n");
 119 }