Linux/AM3359: AM3359 gpmc clock issue

Murugan S22

Part Number: AM3359

Tool/software: Linux

Hello all,

I'm using am3359 ice v2 with sdk v4.0.We are trying to interface an fpga at CS2.I'm trying to write random data to gpmc address space.I'm able to probe the AD[0-15] and some signals are coming.WR_EN RE_EN and CSn2 signals appear to be fine too.But no clock is coming from GPMC_CLK.I'm probing resistor R150 to see the clock.I was informed that gpmc_clk will be generated only if there is a synchronous gpmc access.For synchronous gpmc access is the device tree configuration sufficient?Or is there any other trigger for synchronous access?

This is my dts config for gpmc:

&gpmc {
   status = "okay";
   pinctrl-names = "default";
   pinctrl-0 = <&gpmc_pins>;
   dmas = <&edma 52 0>;
   dma-names = "rxtx";

   ranges = <0 0 0x08000000 0x01000000>,   /*CSn0 for NAND*/
           <2 0 0x09000000 0x01000000>;   /*CSn2 for FPGA*/

   nand@0,0 {
/*removed for now*/
};

   fpga@1,0{
         reg = <2 0 0x01000000>; /*CSn2*/
          #address-cells = <1>;
         #size-cells = <0>;
            bank-width = <2>; /* GPMC_CONFIG1_DEVICESIZE(1) *//*16 bit wide*/
           interrupt-parent = <&gpmc>;
           interrupts = <0 0>, <1 0>;
             /*gpmc,burst-write;*/
             /*gpmc,burst-read;*/
             /*gpmc,burst-wrap;*/
             gpmc,sync-read; /* GPMC_CONFIG1_READTYPE_ASYNC */
             gpmc,sync-write; /* GPMC_CONFIG1_WRITETYPE_ASYNC */
             gpmc,clk-activation-ns = <0>; /* GPMC_CONFIG1_CLKACTIVATIONTIME(2) */
             gpmc,burst-length = <16>; /* GPMC_CONFIG1_PAGE_LEN(2) */
             gpmc,mux-add-data = <2>; /* GPMC_CONFIG1_MUXTYPE(2) */

             gpmc,sync-clk-ps = <20000>; /* CONFIG2 */

             gpmc,cs-on-ns = <0>;
             gpmc,cs-rd-off-ns = <100>;
             gpmc,cs-wr-off-ns = <40>;

             gpmc,adv-on-ns = <0>; /* CONFIG3 */
             gpmc,adv-rd-off-ns = <20>;
             gpmc,adv-wr-off-ns = <20>;

             gpmc,we-on-ns = <20>; /* CONFIG4 */
             gpmc,we-off-ns = <40>;
             gpmc,oe-on-ns = <20>;
             gpmc,oe-off-ns = <100>;

             gpmc,page-burst-access-ns = <20>; /* CONFIG 5 */
             gpmc,access-ns = <80>;
             gpmc,rd-cycle-ns = <120>;
             gpmc,wr-cycle-ns = <60>;
             gpmc,wr-access-ns = <40>; /* CONFIG 6 */
             gpmc,wr-data-mux-bus-ns = <20>;

            /*gpmc,bus-turnaround-ns = <40>;*/ /* CONFIG6:3:0 = 4 */
             gpmc,cycle2cycle-samecsen; /* CONFIG6:7 = 1 */
             gpmc,cycle2cycle-delay-ns = <20>; /* CONFIG6:11:8 = 4 */

};
};

Pinmuxing for gpmc:

&am33xx_pinmux {
        gpmc_pins: gpmc_pins {
                pinctrl-single,pins=<
                        AM33XX_IOPAD(0x800,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad0.gpmc.ad0*/
                        AM33XX_IOPAD(0x804,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad1.gpmc.ad1*/
                        AM33XX_IOPAD(0x808,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad2.gpmc.ad2*/
                        AM33XX_IOPAD(0x80C,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad3.gpmc.ad3*/
                        AM33XX_IOPAD(0x810,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad4.gpmc.ad4*/
                        AM33XX_IOPAD(0x814,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad5.gpmc.ad5*/
                        AM33XX_IOPAD(0x818,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad6.gpmc.ad6*/
                        AM33XX_IOPAD(0x81C,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad7.gpmc.ad7*/
                        AM33XX_IOPAD(0x820,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad8.gpmc.ad8*/
                        AM33XX_IOPAD(0x824,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad9.gpmc.ad9*/
                        AM33XX_IOPAD(0x828,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad10.gpmc.ad10*/
                        AM33XX_IOPAD(0x82C,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad11.gpmc.ad11*/
                        AM33XX_IOPAD(0x830,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad12.gpmc.ad12*/
                        AM33XX_IOPAD(0x834,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad13.gpmc.ad13*/
                        AM33XX_IOPAD(0x838,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad14.gpmc.ad14*/
                        AM33XX_IOPAD(0x83C,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_ad15.gpmc.ad15*/

                        AM33XX_IOPAD(0x870,PIN_INPUT_PULLUP|MUX_MODE0)/*gpmc_wait0*/
                        AM33XX_IOPAD(0x874,PIN_OUTPUT|MUX_MODE0)/*gpmc_wpn*/
                        AM33XX_IOPAD(0x878,PIN_OUTPUT|MUX_MODE0)/*gpmc_ben1*/
                        AM33XX_IOPAD(0x87C,PIN_OUTPUT|MUX_MODE0)/*gpmc_csn0*/
                        AM33XX_IOPAD(0x884,PIN_OUTPUT|MUX_MODE0)/*gpmc_csn2*/
                        AM33XX_IOPAD(0x88C,PIN_OUTPUT|MUX_MODE0)/*gpmc_clk*/
                        AM33XX_IOPAD(0x890,PIN_OUTPUT|MUX_MODE0)/*gpmc_advn_ale*/
                        AM33XX_IOPAD(0x894,PIN_OUTPUT_PULLUP|MUX_MODE0)/*gpmc_oen_ren*/
                        AM33XX_IOPAD(0x898,PIN_OUTPUT_PULLUP|MUX_MODE0)/*gpmc_wen*/
                        AM33XX_IOPAD(0x89C,PIN_OUTPUT_PULLUP|MUX_MODE0)/*gpmc_ben0_cle*/
                >;
        };