[PATCH v1] [ZynqMP] Writing correct value to ANALOG_BUS.

[Adrian Fiergolski]

The default register configuration after powerup for PSSYSMON_ANALOG_BUS
register is incorrect. Hence, fix this in SPL by writing correct fixed
value. It follows UG1085 chapter 'PS SYSMON Analog_Bus' and reflects commit
sw_apps:zynq ("056ca65d44549ce27f716d423e8dfdefeee7440c")
in Xilinx:embeddedsw[1].

[1] https://github.com/Xilinx/embeddedsw

Signed-off-by: Adrian Fiergolski <adrian.fiergolski at fastree3d.com>

---
Changes in v1:
 - fix patch log
 - based on v2021.07-rc4 branch
 
 arch/arm/mach-zynqmp/include/mach/hardware.h |  5 +++++
 board/xilinx/zynqmp/zynqmp.c                 | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/arm/mach-zynqmp/include/mach/hardware.h b/arch/arm/mach-zynqmp/include/mach/hardware.h
index a0acfa2ff1..4774ed4089 100644
--- a/arch/arm/mach-zynqmp/include/mach/hardware.h
+++ b/arch/arm/mach-zynqmp/include/mach/hardware.h
@@ -15,6 +15,11 @@
 #define ZYNQMP_CRL_APB_BOOT_PIN_CTRL_OUT_EN_SHIFT	0
 #define ZYNQMP_CRL_APB_BOOT_PIN_CTRL_OUT_VAL_SHIFT	8
 
+#define ZYNQMP_AMS_PS_SYSMON_BASEADDR      0XFFA50800
+#define ZYNQMP_AMS_PS_SYSMON_ANALOG_BUS ((ZYNQMP_AMS_PS_SYSMON_BASEADDR) \
+							    + 0x00000114)
+#define ZYNQMP_PS_SYSMON_ANALOG_BUS_VAL 0x00003210
+
 #define PS_MODE0	BIT(0)
 #define PS_MODE1	BIT(1)
 #define PS_MODE2	BIT(2)

diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index d05f0b2e12..ee4d0c85e6 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -287,6 +287,17 @@ int board_early_init_f(void)
 	if (ret)
 		return ret;
 
+	/*
+	 * PS_SYSMON_ANALOG_BUS register determines mapping between SysMon
+	 * supply sense channel to SysMon supply registers inside the IP.
+	 * This register must be programmed to complete SysMon IP
+	 * configuration. The default register configuration after
+	 * power-up is incorrect. Hence, fix this by writing the
+	 * correct value - 0x3210.
+	 */
+	writel(ZYNQMP_PS_SYSMON_ANALOG_BUS_VAL,
+	       ZYNQMP_AMS_PS_SYSMON_ANALOG_BUS);
+
 	/* Delay is required for clocks to be propagated */
 	udelay(1000000);
 #endif