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
  15 #include <asm/tlb.h>
  16 #include <asm/mach/map.h>
  17
  18 #include <mach/common.h>
  19 #include <mach/cputype.h>
  20 #include <mach/emac.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 struct davinci_id * __init davinci_get_id(u32 jtag_id)
  41 {
  42         int i;
  43         struct davinci_id *dip;
  44         u8 variant = (jtag_id & 0xf0000000) >> 28;
  45         u16 part_no = (jtag_id & 0x0ffff000) >> 12;
  46
  47         for (i = 0, dip = davinci_soc_info.ids; i < davinci_soc_info.ids_num;
  48                         i++, dip++)
  49                 /* Don't care about the manufacturer right now */
  50                 if ((dip->part_no == part_no) && (dip->variant == variant))
  51                         return dip;
  52
  53         return NULL;
  54 }
  55
  56 void __init davinci_common_init(struct davinci_soc_info *soc_info)
  57 {
  58         int ret;
  59         struct davinci_id *dip;
  60
  61         if (!soc_info) {
  62                 ret = -EINVAL;
  63                 goto err;
  64         }
  65
  66         memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
  67
  68         if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
  69                 iotable_init(davinci_soc_info.io_desc,
  70                                 davinci_soc_info.io_desc_num);
  71
  72         /*
  73          * Normally devicemaps_init() would flush caches and tlb after
  74          * mdesc->map_io(), but we must also do it here because of the CPU
  75          * revision check below.
  76          */
  77         local_flush_tlb_all();
  78         flush_cache_all();
  79
  80         /*
  81          * We want to check CPU revision early for cpu_is_xxxx() macros.
  82          * IO space mapping must be initialized before we can do that.
  83          */
  84         davinci_soc_info.jtag_id = __raw_readl(davinci_soc_info.jtag_id_base);
  85
  86         dip = davinci_get_id(davinci_soc_info.jtag_id);
  87         if (!dip) {
  88                 ret = -EINVAL;
  89                 pr_err("Unknown DaVinci JTAG ID 0x%x\n",
  90                                                 davinci_soc_info.jtag_id);
  91                 goto err;
  92         }
  93
  94         davinci_soc_info.cpu_id = dip->cpu_id;
  95         pr_info("DaVinci %s variant 0x%x\n", dip->name, dip->variant);
  96
  97         if (davinci_soc_info.cpu_clks) {
  98                 ret = davinci_clk_init(davinci_soc_info.cpu_clks);
  99
 100                 if (ret != 0)
 101                         goto err;
 102         }
 103
 104         davinci_intc_base = davinci_soc_info.intc_base;
 105         davinci_intc_type = davinci_soc_info.intc_type;
 106         return;
 107
 108 err:
 109         panic("davinci_common_init: SoC Initialization failed\n");
 110 }