zynqmp: pm: Implement PLL set parameter EEMI API

This API will be used to set a parameter for the PLL. The parameter
value that is set will have effect once the PLL mode is set to integer
or fractional mode. Parameter values represent the values as defined
in the Zynq MPSoC register reference manual ug1087.

Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>

plat/xilinx/zynqmp/pm_service/pm_api_sys.c

@@ -1237,3 +1237,34 @@ enum pm_ret_status pm_fpga_read(uint32_t reg_numframes,
 			 address_high, readback_type);
 	return pm_ipi_send_sync(primary_proc, payload, value, 1);
 }
+
+/*
+ * pm_pll_set_parameter() - Set the PLL parameter value
+ * @nid		Node id of the target PLL
+ * @param_id	ID of the PLL parameter
+ * @value	Parameter value to be set
+ *
+ * Setting the parameter will have physical effect once the PLL mode is set to
+ * integer or fractional.
+ *
+ * @return	Error if an argument is not valid or status as returned by the
+ *		PM controller (PMU)
+ */
+enum pm_ret_status pm_pll_set_parameter(enum pm_node_id nid,
+					enum pm_pll_param param_id,
+					unsigned int value)
+{
+	uint32_t payload[PAYLOAD_ARG_CNT];
+
+	/* Check if given node ID is a PLL node */
+	if (nid < NODE_APLL || nid > NODE_IOPLL)
+		return PM_RET_ERROR_ARGS;
+
+	/* Check if parameter ID is valid and return an error if it's not */
+	if (param_id >= PM_PLL_PARAM_MAX)
+		return PM_RET_ERROR_ARGS;
+
+	/* Send request to the PMU */
+	PM_PACK_PAYLOAD4(payload, PM_PLL_SET_PARAMETER, nid, param_id, value);
+	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
+}

plat/xilinx/zynqmp/pm_service/pm_api_sys.h

@@ -176,4 +176,8 @@ enum pm_ret_status pm_aes_engine(uint32_t address_high,
 				 uint32_t address_low,
 				 uint32_t  *value);
 
+enum pm_ret_status pm_pll_set_parameter(enum pm_node_id nid,
+				enum pm_pll_param param_id,
+				unsigned int value);
+
 #endif /* PM_API_SYS_H */

plat/xilinx/zynqmp/pm_service/pm_defs.h

@@ -92,6 +92,8 @@ enum pm_api_id {
 	/* FPGA PL Readback */
 	PM_FPGA_READ,
 	PM_SECURE_AES,
+	/* PLL control API functions */
+	PM_PLL_SET_PARAMETER,
 	PM_API_MAX
 };
 
@@ -265,4 +267,31 @@ enum pm_shutdown_subtype {
 	PMF_SHUTDOWN_SUBTYPE_SYSTEM,
 };
 
+/**
+ * @PM_PLL_PARAM_DIV2:         Enable for divide by 2 function inside the PLL
+ * @PM_PLL_PARAM_FBDIV:        Feedback divisor integer portion for the PLL
+ * @PM_PLL_PARAM_DATA:         Feedback divisor fractional portion for the PLL
+ * @PM_PLL_PARAM_PRE_SRC:      Clock source for PLL input
+ * @PM_PLL_PARAM_POST_SRC:     Clock source for PLL Bypass mode
+ * @PM_PLL_PARAM_LOCK_DLY:     Lock circuit config settings for lock windowsize
+ * @PM_PLL_PARAM_LOCK_CNT:     Lock circuit counter setting
+ * @PM_PLL_PARAM_LFHF:         PLL loop filter high frequency capacitor control
+ * @PM_PLL_PARAM_CP:           PLL charge pump control
+ * @PM_PLL_PARAM_RES:          PLL loop filter resistor control
+ */
+enum pm_pll_param {
+	PM_PLL_PARAM_DIV2,
+	PM_PLL_PARAM_FBDIV,
+	PM_PLL_PARAM_DATA,
+	PM_PLL_PARAM_PRE_SRC,
+	PM_PLL_PARAM_POST_SRC,
+	PM_PLL_PARAM_LOCK_DLY,
+	PM_PLL_PARAM_LOCK_CNT,
+	PM_PLL_PARAM_LFHF,
+	PM_PLL_PARAM_CP,
+	PM_PLL_PARAM_RES,
+	PM_PLL_PARAM_MAX,
+};
+
+
 #endif /* PM_DEFS_H */

plat/xilinx/zynqmp/pm_service/pm_svc_main.c

@@ -563,6 +563,10 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 		SMC_RET1(handle, (uint64_t)ret | ((uint64_t)value) << 32);
 	}
 
+	case PM_PLL_SET_PARAMETER:
+		ret = pm_pll_set_parameter(pm_arg[0], pm_arg[1], pm_arg[2]);
+		SMC_RET1(handle, (uint64_t)ret);
+
 	default:
 		WARN("Unimplemented PM Service Call: 0x%x\n", smc_fid);
 		SMC_RET1(handle, SMC_UNK);