[linux-sunxi] T113 EMAC stuck in soft reset

['Dave Johnson' via linux-sunxi]

Hi,

I'm trying to bring up my T113-s3 based board and cannot get the EMAC
to initialize.

Some info about my board:

I'm using a RTL8201F phy on the PG pins in RMII mode and want to use
the EPHY-25M clock output on PG11 to drive the phy so no external
crystal is needed.


Kernel: https://github.com/smaeul/linux.git at 
b466df90d48fb7ef03f331e0c73c8012ac03a12e

DTS snippets:

    emac: ethernet@4500000 {
            compatible = "allwinner,sun20i-d1-emac",
                         "allwinner,sun50i-a64-emac";
            reg = <0x4500000 0x10000>;
            interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
            interrupt-names = "macirq";
            clocks = <&ccu CLK_BUS_EMAC>;
            clock-names = "stmmaceth";
            resets = <&ccu RST_BUS_EMAC>;
            reset-names = "stmmaceth";
            syscon = <&syscon>;
            status = "disabled";

            mdio: mdio {
                compatible = "snps,dwmac-mdio";
                #address-cells = <1>;
                #size-cells = <0>;
            };
        };

  &pio {
          rmii_pg_pins: rmii-pg-pins {
                  pins = "PG0", "PG1", "PG2", "PG3", "PG4",
                         "PG5", "PG11", "PG12", "PG13", "PG14", "PG15";
                  function = "emac";
          };
       };

  &emac {
      pinctrl-0 = <&rmii_pg_pins>;
      pinctrl-names = "default";
      phy-handle = <&rtl8201f>;
      phy-mode = "rmii";
      phy-supply = <&reg_vcc_3v3>;
      clocks = <&ccu CLK_BUS_EMAC>, <&ccu CLK_EMAC_25M>;
      clock-names = "stmmaceth", "ephy25m";
      status = "okay";
  };

  &mdio {
      status = "okay";
      reset-gpios = <&pio 6 7 GPIO_ACTIVE_LOW>; /* PG7 */
      reset-assert-us = <10000>;
      reset-post-delay-us = <150000>;
      reset-deassert-us = <150000>;
      rtl8201f: ethernet-phy@0 {
          compatible = "ethernet-phy-id001c.c816"; /* RTL8201F */
          reg = <0>;
      };
  };



When the kernel driver loads, I end up with sun8i_dwmac_reset() failing because 
bit 0 in EMAC_BASIC_CTL1 is stuck on and never self-clears:

  [    1.984000] dwmac-sun8i 4500000.ethernet: EMAC reset timeout


I can also manually attempt to bring the EMAC online with:

  $ sudo devmem 0x0200197c 32 0x00000000 #EMAC_BGR_REG       reset
  $ sudo devmem 0x0200197c 32 0x00010000 #EMAC_BGR_REG       enable clock
  $ sudo devmem 0x0200197c 32 0x00010001 #EMAC_BGR_REG       release reset
  $ sudo devmem 0x02001970 32 0xc0000000 #EMAC_25M_CLK_REG   setup EPHY-25M
  $ sudo devmem 0x03000030 32 0x00012000 #EMAC_EPHY_CLK_REG0 setup RMII mode, 
external PHY
  $ sudo devmem 0x04500004 32 0x08000001 #EMAC_BASIC_CTL1    attempt soft reset


  pinctrl is setup:
  $ sudo devmem 0x02000120 32
  0x1F444444
  $ sudo devmem 0x02000124 32
  0x44444FFF
  
  clocks and reset:
  $ sudo devmem 0x0200197c 32
  0x00010001
  $ sudo devmem 0x02001970 32
  0xC0000000
  
  syscon:
  $ sudo devmem 0x03000030 32
  0x00012000
  
  soft reset is stuck:
  $ sudo devmem 0x04500004 32
  0x08000001


Has anyone succesfully got the T113/D1 EMAC to work, especially in RMII mode?




-- 
Dave

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