arch/arm/boot/dts/bcm2837.dtsi

   1 #include "bcm283x.dtsi"
   2
   3 / {
   4         compatible = "brcm,bcm2837";
   5
   6         soc {
   7                 ranges = <0x7e000000 0x3f000000 0x1000000>,
   8                          <0x40000000 0x40000000 0x00001000>;
   9                 dma-ranges = <0xc0000000 0x00000000 0x3f000000>;
  10
  11                 local_intc: local_intc@40000000 {
  12                         compatible = "brcm,bcm2836-l1-intc";
  13                         reg = <0x40000000 0x100>;
  14                         interrupt-controller;
  15                         #interrupt-cells = <1>;
  16                         interrupt-parent = <&local_intc>;
  17                 };
  18         };
  19
  20         timer {
  21                 compatible = "arm,armv7-timer";
  22                 interrupt-parent = <&local_intc>;
  23                 interrupts = <0>, // PHYS_SECURE_PPI
  24                              <1>, // PHYS_NONSECURE_PPI
  25                              <3>, // VIRT_PPI
  26                              <2>; // HYP_PPI
  27                 always-on;
  28         };
  29
  30         cpus: cpus {
  31                 #address-cells = <1>;
  32                 #size-cells = <0>;
  33                 enable-method = "brcm,bcm2836-smp"; // for ARM 32-bit
  34
  35                 /* Source for d/i-cache-line-size and d/i-cache-sets
  36                  * https://developer.arm.com/documentation/ddi0500/e/level-1-memory-system
  37                  * /about-the-l1-memory-system?lang=en
  38                  *
  39                  * Source for d/i-cache-size
  40                  * https://magpi.raspberrypi.com/articles/raspberry-pi-3-specs-benchmarks
  41                  */
  42                 cpu0: cpu@0 {
  43                         device_type = "cpu";
  44                         compatible = "arm,cortex-a53";
  45                         reg = <0>;
  46                         enable-method = "spin-table";
  47                         cpu-release-addr = <0x0 0x000000d8>;
  48                         d-cache-size = <0x8000>;
  49                         d-cache-line-size = <64>;
  50                         d-cache-sets = <128>; // 32KiB(size)/64(line-size)=512ways/4-way set
  51                         i-cache-size = <0x8000>;
  52                         i-cache-line-size = <64>;
  53                         i-cache-sets = <256>; // 32KiB(size)/64(line-size)=512ways/2-way set
  54                         next-level-cache = <&l2>;
  55                 };
  56
  57                 cpu1: cpu@1 {
  58                         device_type = "cpu";
  59                         compatible = "arm,cortex-a53";
  60                         reg = <1>;
  61                         enable-method = "spin-table";
  62                         cpu-release-addr = <0x0 0x000000e0>;
  63                         d-cache-size = <0x8000>;
  64                         d-cache-line-size = <64>;
  65                         d-cache-sets = <128>; // 32KiB(size)/64(line-size)=512ways/4-way set
  66                         i-cache-size = <0x8000>;
  67                         i-cache-line-size = <64>;
  68                         i-cache-sets = <256>; // 32KiB(size)/64(line-size)=512ways/2-way set
  69                         next-level-cache = <&l2>;
  70                 };
  71
  72                 cpu2: cpu@2 {
  73                         device_type = "cpu";
  74                         compatible = "arm,cortex-a53";
  75                         reg = <2>;
  76                         enable-method = "spin-table";
  77                         cpu-release-addr = <0x0 0x000000e8>;
  78                         d-cache-size = <0x8000>;
  79                         d-cache-line-size = <64>;
  80                         d-cache-sets = <128>; // 32KiB(size)/64(line-size)=512ways/4-way set
  81                         i-cache-size = <0x8000>;
  82                         i-cache-line-size = <64>;
  83                         i-cache-sets = <256>; // 32KiB(size)/64(line-size)=512ways/2-way set
  84                         next-level-cache = <&l2>;
  85                 };
  86
  87                 cpu3: cpu@3 {
  88                         device_type = "cpu";
  89                         compatible = "arm,cortex-a53";
  90                         reg = <3>;
  91                         enable-method = "spin-table";
  92                         cpu-release-addr = <0x0 0x000000f0>;
  93                         d-cache-size = <0x8000>;
  94                         d-cache-line-size = <64>;
  95                         d-cache-sets = <128>; // 32KiB(size)/64(line-size)=512ways/4-way set
  96                         i-cache-size = <0x8000>;
  97                         i-cache-line-size = <64>;
  98                         i-cache-sets = <256>; // 32KiB(size)/64(line-size)=512ways/2-way set
  99                         next-level-cache = <&l2>;
 100                 };
 101
 102                 /* Source for cache-line-size + cache-sets
 103                  * https://developer.arm.com/documentation/ddi0500
 104                  * /e/level-2-memory-system/about-the-l2-memory-system?lang=en
 105                  * Source for cache-size
 106                  * https://datasheets.raspberrypi.com/cm/cm1-and-cm3-datasheet.pdf
 107                  */
 108                 l2: l2-cache0 {
 109                         compatible = "cache";
 110                         cache-size = <0x80000>;
 111                         cache-line-size = <64>;
 112                         cache-sets = <512>; // 512KiB(size)/64(line-size)=8192ways/16-way set
 113                         cache-level = <2>;
 114                 };
 115         };
 116 };
 117
 118 /* Make the BCM2835-style global interrupt controller be a child of the
 119  * CPU-local interrupt controller.
 120  */
 121 &intc {
 122         compatible = "brcm,bcm2836-armctrl-ic";
 123         reg = <0x7e00b200 0x200>;
 124         interrupt-parent = <&local_intc>;
 125         interrupts = <8>;
 126 };
 127
 128 &cpu_thermal {
 129         coefficients = <(-538)  412000>;
 130 };
 131
 132 /* enable thermal sensor with the correct compatible property set */
 133 &thermal {
 134         compatible = "brcm,bcm2837-thermal";
 135         status = "okay";
 136 };