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 #include "clock.h"
  24
  25 struct davinci_soc_info davinci_soc_info;
  26 EXPORT_SYMBOL(davinci_soc_info);
  27
  28 void __iomem *davinci_intc_base;
  29 int davinci_intc_type;
  30
  31 void davinci_get_mac_addr(struct nvmem_device *nvmem, void *context)
  32 {
  33         char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
  34         off_t offset = (off_t)context;
  35
  36         if (!IS_BUILTIN(CONFIG_NVMEM)) {
  37                 pr_warn("Cannot read MAC addr from EEPROM without CONFIG_NVMEM\n");
  38                 return;
  39         }
  40
  41         /* Read MAC addr from EEPROM */
  42         if (nvmem_device_read(nvmem, offset, ETH_ALEN, mac_addr) == ETH_ALEN)
  43                 pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
  44 }
  45
  46 static int __init davinci_init_id(struct davinci_soc_info *soc_info)
  47 {
  48         int                     i;
  49         struct davinci_id       *dip;
  50         u8                      variant;
  51         u16                     part_no;
  52         void __iomem            *base;
  53
  54         base = ioremap(soc_info->jtag_id_reg, SZ_4K);
  55         if (!base) {
  56                 pr_err("Unable to map JTAG ID register\n");
  57                 return -ENOMEM;
  58         }
  59
  60         soc_info->jtag_id = __raw_readl(base);
  61         iounmap(base);
  62
  63         variant = (soc_info->jtag_id & 0xf0000000) >> 28;
  64         part_no = (soc_info->jtag_id & 0x0ffff000) >> 12;
  65
  66         for (i = 0, dip = soc_info->ids; i < soc_info->ids_num;
  67                         i++, dip++)
  68                 /* Don't care about the manufacturer right now */
  69                 if ((dip->part_no == part_no) && (dip->variant == variant)) {
  70                         soc_info->cpu_id = dip->cpu_id;
  71                         pr_info("DaVinci %s variant 0x%x\n", dip->name,
  72                                         dip->variant);
  73                         return 0;
  74                 }
  75
  76         pr_err("Unknown DaVinci JTAG ID 0x%x\n", soc_info->jtag_id);
  77         return -EINVAL;
  78 }
  79
  80 void __init davinci_common_init(struct davinci_soc_info *soc_info)
  81 {
  82         int ret;
  83
  84         if (!soc_info) {
  85                 ret = -EINVAL;
  86                 goto err;
  87         }
  88
  89         memcpy(&davinci_soc_info, soc_info, sizeof(struct davinci_soc_info));
  90
  91         if (davinci_soc_info.io_desc && (davinci_soc_info.io_desc_num > 0))
  92                 iotable_init(davinci_soc_info.io_desc,
  93                                 davinci_soc_info.io_desc_num);
  94
  95         /*
  96          * Normally devicemaps_init() would flush caches and tlb after
  97          * mdesc->map_io(), but we must also do it here because of the CPU
  98          * revision check below.
  99          */
 100         local_flush_tlb_all();
 101         flush_cache_all();
 102
 103         /*
 104          * We want to check CPU revision early for cpu_is_xxxx() macros.
 105          * IO space mapping must be initialized before we can do that.
 106          */
 107         ret = davinci_init_id(&davinci_soc_info);
 108         if (ret < 0)
 109                 goto err;
 110
 111
 112         return;
 113
 114 err:
 115         panic("davinci_common_init: SoC Initialization failed\n");
 116 }
 117
 118 void __init davinci_init_late(void)
 119 {
 120         davinci_cpufreq_init();
 121         davinci_clk_disable_unused();
 122 }