arch/arm/mach-imx/cpu.c

   1 #include <linux/err.h>
   2 #include <linux/module.h>
   3 #include <linux/io.h>
   4 #include <linux/of.h>
   5 #include <linux/slab.h>
   6 #include <linux/sys_soc.h>
   7
   8 #include "hardware.h"
   9 #include "common.h"
  10
  11 unsigned int __mxc_cpu_type;
  12 EXPORT_SYMBOL(__mxc_cpu_type);
  13
  14 static unsigned int imx_soc_revision;
  15
  16 void mxc_set_cpu_type(unsigned int type)
  17 {
  18         __mxc_cpu_type = type;
  19 }
  20
  21 void imx_set_soc_revision(unsigned int rev)
  22 {
  23         imx_soc_revision = rev;
  24 }
  25
  26 unsigned int imx_get_soc_revision(void)
  27 {
  28         return imx_soc_revision;
  29 }
  30
  31 void imx_print_silicon_rev(const char *cpu, int srev)
  32 {
  33         if (srev == IMX_CHIP_REVISION_UNKNOWN)
  34                 pr_info("CPU identified as %s, unknown revision\n", cpu);
  35         else
  36                 pr_info("CPU identified as %s, silicon rev %d.%d\n",
  37                                 cpu, (srev >> 4) & 0xf, srev & 0xf);
  38 }
  39
  40 void __init imx_set_aips(void __iomem *base)
  41 {
  42         unsigned int reg;
  43 /*
  44  * Set all MPROTx to be non-bufferable, trusted for R/W,
  45  * not forced to user-mode.
  46  */
  47         __raw_writel(0x77777777, base + 0x0);
  48         __raw_writel(0x77777777, base + 0x4);
  49
  50 /*
  51  * Set all OPACRx to be non-bufferable, to not require
  52  * supervisor privilege level for access, allow for
  53  * write access and untrusted master access.
  54  */
  55         __raw_writel(0x0, base + 0x40);
  56         __raw_writel(0x0, base + 0x44);
  57         __raw_writel(0x0, base + 0x48);
  58         __raw_writel(0x0, base + 0x4C);
  59         reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
  60         __raw_writel(reg, base + 0x50);
  61 }
  62
  63 struct device * __init imx_soc_device_init(void)
  64 {
  65         struct soc_device_attribute *soc_dev_attr;
  66         struct soc_device *soc_dev;
  67         struct device_node *root;
  68         const char *soc_id;
  69         int ret;
  70
  71         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  72         if (!soc_dev_attr)
  73                 return NULL;
  74
  75         soc_dev_attr->family = "Freescale i.MX";
  76
  77         root = of_find_node_by_path("/");
  78         ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
  79         of_node_put(root);
  80         if (ret)
  81                 goto free_soc;
  82
  83         switch (__mxc_cpu_type) {
  84         case MXC_CPU_MX1:
  85                 soc_id = "i.MX1";
  86                 break;
  87         case MXC_CPU_MX21:
  88                 soc_id = "i.MX21";
  89                 break;
  90         case MXC_CPU_MX25:
  91                 soc_id = "i.MX25";
  92                 break;
  93         case MXC_CPU_MX27:
  94                 soc_id = "i.MX27";
  95                 break;
  96         case MXC_CPU_MX31:
  97                 soc_id = "i.MX31";
  98                 break;
  99         case MXC_CPU_MX35:
 100                 soc_id = "i.MX35";
 101                 break;
 102         case MXC_CPU_MX51:
 103                 soc_id = "i.MX51";
 104                 break;
 105         case MXC_CPU_MX53:
 106                 soc_id = "i.MX53";
 107                 break;
 108         case MXC_CPU_IMX6SL:
 109                 soc_id = "i.MX6SL";
 110                 break;
 111         case MXC_CPU_IMX6DL:
 112                 soc_id = "i.MX6DL";
 113                 break;
 114         case MXC_CPU_IMX6Q:
 115                 soc_id = "i.MX6Q";
 116                 break;
 117         default:
 118                 soc_id = "Unknown";
 119         }
 120         soc_dev_attr->soc_id = soc_id;
 121
 122         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
 123                                            (imx_soc_revision >> 4) & 0xf,
 124                                            imx_soc_revision & 0xf);
 125         if (!soc_dev_attr->revision)
 126                 goto free_soc;
 127
 128         soc_dev = soc_device_register(soc_dev_attr);
 129         if (IS_ERR(soc_dev))
 130                 goto free_rev;
 131
 132         return soc_device_to_device(soc_dev);
 133
 134 free_rev:
 135         kfree(soc_dev_attr->revision);
 136 free_soc:
 137         kfree(soc_dev_attr);
 138         return NULL;
 139 }