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
  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
  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 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
  56void __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                goto err;
  90        }
  91
  92        davinci_soc_info.cpu_id = dip->cpu_id;
  93        pr_info("DaVinci %s variant 0x%x\n", dip->name, dip->variant);
  94
  95        if (davinci_soc_info.cpu_clks) {
  96                ret = davinci_clk_init(davinci_soc_info.cpu_clks);
  97
  98                if (ret != 0)
  99                        goto err;
 100        }
 101
 102        davinci_intc_base = davinci_soc_info.intc_base;
 103        davinci_intc_type = davinci_soc_info.intc_type;
 104        return;
 105
 106err:
 107        pr_err("davinci_common_init: SoC Initialization failed\n");
 108}
 109