LXR linux/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
  24struct davinci_soc_info davinci_soc_info;
  25EXPORT_SYMBOL(davinci_soc_info);
  26
  27void __iomem *davinci_intc_base;
  28int davinci_intc_type;
  29
  30void 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
  40static 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
  74void __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
 117err:
 118        panic("davinci_common_init: SoC Initialization failed\n");
 119}
 120