Based on TI-processor-SDK-Linux-RT-AM62XX-EVM-08.03.00.19, it was found that the GPMC bus has no driver during development. Add GPMC device driver nodes by referring to the 64X bus driver. There was a problem with the GPMC device initialization.
Device Tree Modification:
diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
index 46bc1adb3f..0bf685e534 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
@@ -910,4 +909,23 @@
interrupt-names = "vring";
};
};
+
+ gpmc0: memory-controller@3b000000 {
+ compatible = "ti,am64-gpmc";
+ power-domains = <&k3_pds 80 TI_SCI_PD_EXCLUSIVE>;
+ clocks = <&k3_clks 80 0>;
+ clock-names = "fck";
+ reg = <0x00 0x03b000000 0x00 0x400>,
+ <0x00 0x050000000 0x00 0x08000000>;
+ reg-names = "cfg", "data";
+ interrupts = <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>;
+ gpmc,num-cs = <3>;
+ gpmc,num-waitpins = <2>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
};
diff --git a/arch/arm64/boot/dts/ti/k3-am62.dtsi b/arch/arm64/boot/dts/ti/k3-am62.dtsi
index 65497aaa9d..1cb57842ae 100644
--- a/arch/arm64/boot/dts/ti/k3-am62.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62.dtsi
@@ -66,11 +66,13 @@
<0x00 0x30200000 0x00 0x30200000 0x00 0x00010000>, /* DSS */
<0x00 0x31000000 0x00 0x31000000 0x00 0x00050000>, /* USB0 DWC3 Core window */
<0x00 0x31100000 0x00 0x31100000 0x00 0x00050000>, /* USB1 DWC3 Core window */
+ <0x00 0x3b000000 0x00 0x3b000000 0x00 0x00000400>, /* GPMC0_CFG */
<0x00 0x40900000 0x00 0x40900000 0x00 0x00030000>, /* SA3UL */
<0x00 0x43600000 0x00 0x43600000 0x00 0x00010000>, /* SA3 sproxy data */
<0x00 0x44043000 0x00 0x44043000 0x00 0x00000fe0>, /* TI SCI DEBUG */
<0x00 0x44860000 0x00 0x44860000 0x00 0x00040000>, /* SA3 sproxy config */
<0x00 0x48000000 0x00 0x48000000 0x00 0x06400000>, /* DMSS */
+ <0x00 0x50000000 0x00 0x50000000 0x00 0x08000000>, /* GPMC0 DATA */
<0x00 0x60000000 0x00 0x60000000 0x00 0x08000000>, /* FSS0 DAT1 */
<0x00 0x70000000 0x00 0x70000000 0x00 0x00010000>, /* OCSRAM */
<0x00 0x78000000 0x00 0x78000000 0x00 0x00008000>, /* DM R5 ATCM */
diff --git a/arch/arm64/boot/dts/ti/k3-am625-sk.dts b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
index e5ca3b609c..33064a4707 100644
--- a/arch/arm64/boot/dts/ti/k3-am625-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
@@ -811,6 +900,58 @@
};
};
+&gpmc0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&gpmc0_pins_default>;
+ ranges = <0 0 0x00 0x51000000 0x01000000>; /* CS0 space. Min partition = 16MB */
+
+ gpmc_device@0,0 {
+ compatible = "cfi-flash";
+ linux,mtd-name= "intel,pf48f6000m0y1be";
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ status = "okay";
+
+ reg = <0 0 0x01000000>;
+
+ /* CONFIG 1 */
+ bank-width = <2>; /* GPMC_CONFIG1_DEVICESIZE(1) 2: 16bits */
+ gpmc,mux-add-data = <2>; /* GPMC_CONFIG1_MUXTYPE(0) 2: address-data multiplexing mode */
+
+ /* CONFIG 2 */
+ gpmc,cs-on-ns = <0>;
+ gpmc,cs-rd-off-ns = <37>;
+ gpmc,cs-wr-off-ns = <37>;
+
+ /* CONFIG 3 */
+ gpmc,adv-on-ns = <3>;
+ gpmc,adv-rd-off-ns = <11>;
+ gpmc,adv-wr-off-ns = <11>;
+
+ /* CONFIG 4 */
+ gpmc,oe-on-ns = <15>;
+ gpmc,oe-off-ns = <37>;
+ gpmc,we-on-ns = <15>;
+ gpmc,we-off-ns = <33>;
+
+ /* CONFIG 5 */
+ gpmc,rd-cycle-ns = <37>;
+ gpmc,wr-cycle-ns = <37>;
+ gpmc,access-ns = <33>;
+ gpmc,page-burst-access-ns = <0>;
+
+ /* CONFIG 6 */
+ gpmc,bus-turnaround-ns = <0>;
+ gpmc,cycle2cycle-delay-ns = <0>;
+ gpmc,wr-data-mux-bus-ns = <15>;
+ gpmc,wr-access-ns = <26>;
+ gpmc,cycle2cycle-samecsen;
+ gpmc,cycle2cycle-diffcsen;
+ };
+};
+
&mcu_m4fss {
mboxes = <&mailbox0_cluster0 &mbox_m4_0>;
memory-region = <&mcu_m4fss_dma_memory_region>,
Log of the startup:
root@am62xx-evm:~# dmesg | grep -rn "gpmc"
201:[ 1.471150] omap-gpmc 3b000000.memory-controller: GPMC revision 6.0
202:[ 1.471169] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
203:[ 1.472389] physmap-flash 51000000.gpmc_device: physmap platform flash device: [mem 0x51000000-0x51ffffff]
204:[ 1.472466] physmap-flash 51000000.gpmc_device: map_probe failed
Ti-processor-sdk-linux-rt-am62xx-evm-08.03.00.19, what is the reason why the GPMC bus is not driven?
I want to drive it now, but I have a problem, can you check it for me?
