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![Rajan Vaja](/assets/img/avatar_default.png)
Add ZynqMP firmware IOCTL API to control and configure devices like PLLs, SD, Gem, etc. Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
565 lines
14 KiB
C
565 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Xilinx Zynq MPSoC Firmware layer
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*
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* Copyright (C) 2014-2018 Xilinx, Inc.
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*
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* Michal Simek <michal.simek@xilinx.com>
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* Davorin Mista <davorin.mista@aggios.com>
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* Jolly Shah <jollys@xilinx.com>
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* Rajan Vaja <rajanv@xilinx.com>
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*/
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#include <linux/arm-smccc.h>
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#include <linux/compiler.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/firmware/xlnx-zynqmp.h>
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#include "zynqmp-debug.h"
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/**
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* zynqmp_pm_ret_code() - Convert PMU-FW error codes to Linux error codes
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* @ret_status: PMUFW return code
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*
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* Return: corresponding Linux error code
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*/
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static int zynqmp_pm_ret_code(u32 ret_status)
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{
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switch (ret_status) {
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case XST_PM_SUCCESS:
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case XST_PM_DOUBLE_REQ:
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return 0;
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case XST_PM_NO_ACCESS:
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return -EACCES;
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case XST_PM_ABORT_SUSPEND:
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return -ECANCELED;
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case XST_PM_INTERNAL:
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case XST_PM_CONFLICT:
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case XST_PM_INVALID_NODE:
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default:
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return -EINVAL;
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}
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}
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static noinline int do_fw_call_fail(u64 arg0, u64 arg1, u64 arg2,
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u32 *ret_payload)
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{
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return -ENODEV;
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}
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/*
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* PM function call wrapper
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* Invoke do_fw_call_smc or do_fw_call_hvc, depending on the configuration
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*/
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static int (*do_fw_call)(u64, u64, u64, u32 *ret_payload) = do_fw_call_fail;
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/**
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* do_fw_call_smc() - Call system-level platform management layer (SMC)
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* @arg0: Argument 0 to SMC call
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* @arg1: Argument 1 to SMC call
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* @arg2: Argument 2 to SMC call
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* @ret_payload: Returned value array
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*
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* Invoke platform management function via SMC call (no hypervisor present).
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*
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* Return: Returns status, either success or error+reason
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*/
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static noinline int do_fw_call_smc(u64 arg0, u64 arg1, u64 arg2,
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u32 *ret_payload)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(arg0, arg1, arg2, 0, 0, 0, 0, 0, &res);
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if (ret_payload) {
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ret_payload[0] = lower_32_bits(res.a0);
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ret_payload[1] = upper_32_bits(res.a0);
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ret_payload[2] = lower_32_bits(res.a1);
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ret_payload[3] = upper_32_bits(res.a1);
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}
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return zynqmp_pm_ret_code((enum pm_ret_status)res.a0);
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}
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/**
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* do_fw_call_hvc() - Call system-level platform management layer (HVC)
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* @arg0: Argument 0 to HVC call
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* @arg1: Argument 1 to HVC call
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* @arg2: Argument 2 to HVC call
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* @ret_payload: Returned value array
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*
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* Invoke platform management function via HVC
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* HVC-based for communication through hypervisor
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* (no direct communication with ATF).
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*
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* Return: Returns status, either success or error+reason
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*/
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static noinline int do_fw_call_hvc(u64 arg0, u64 arg1, u64 arg2,
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u32 *ret_payload)
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{
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struct arm_smccc_res res;
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arm_smccc_hvc(arg0, arg1, arg2, 0, 0, 0, 0, 0, &res);
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if (ret_payload) {
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ret_payload[0] = lower_32_bits(res.a0);
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ret_payload[1] = upper_32_bits(res.a0);
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ret_payload[2] = lower_32_bits(res.a1);
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ret_payload[3] = upper_32_bits(res.a1);
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}
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return zynqmp_pm_ret_code((enum pm_ret_status)res.a0);
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}
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/**
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* zynqmp_pm_invoke_fn() - Invoke the system-level platform management layer
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* caller function depending on the configuration
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* @pm_api_id: Requested PM-API call
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* @arg0: Argument 0 to requested PM-API call
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* @arg1: Argument 1 to requested PM-API call
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* @arg2: Argument 2 to requested PM-API call
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* @arg3: Argument 3 to requested PM-API call
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* @ret_payload: Returned value array
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*
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* Invoke platform management function for SMC or HVC call, depending on
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* configuration.
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* Following SMC Calling Convention (SMCCC) for SMC64:
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* Pm Function Identifier,
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* PM_SIP_SVC + PM_API_ID =
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* ((SMC_TYPE_FAST << FUNCID_TYPE_SHIFT)
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* ((SMC_64) << FUNCID_CC_SHIFT)
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* ((SIP_START) << FUNCID_OEN_SHIFT)
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* ((PM_API_ID) & FUNCID_NUM_MASK))
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*
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* PM_SIP_SVC - Registered ZynqMP SIP Service Call.
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* PM_API_ID - Platform Management API ID.
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*
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* Return: Returns status, either success or error+reason
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*/
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int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
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u32 arg2, u32 arg3, u32 *ret_payload)
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{
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/*
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* Added SIP service call Function Identifier
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* Make sure to stay in x0 register
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*/
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u64 smc_arg[4];
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smc_arg[0] = PM_SIP_SVC | pm_api_id;
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smc_arg[1] = ((u64)arg1 << 32) | arg0;
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smc_arg[2] = ((u64)arg3 << 32) | arg2;
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return do_fw_call(smc_arg[0], smc_arg[1], smc_arg[2], ret_payload);
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}
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static u32 pm_api_version;
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static u32 pm_tz_version;
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/**
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* zynqmp_pm_get_api_version() - Get version number of PMU PM firmware
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* @version: Returned version value
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_get_api_version(u32 *version)
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{
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u32 ret_payload[PAYLOAD_ARG_CNT];
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int ret;
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if (!version)
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return -EINVAL;
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/* Check is PM API version already verified */
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if (pm_api_version > 0) {
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*version = pm_api_version;
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return 0;
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}
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ret = zynqmp_pm_invoke_fn(PM_GET_API_VERSION, 0, 0, 0, 0, ret_payload);
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*version = ret_payload[1];
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return ret;
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}
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/**
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* zynqmp_pm_get_trustzone_version() - Get secure trustzone firmware version
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* @version: Returned version value
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_get_trustzone_version(u32 *version)
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{
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u32 ret_payload[PAYLOAD_ARG_CNT];
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int ret;
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if (!version)
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return -EINVAL;
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/* Check is PM trustzone version already verified */
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if (pm_tz_version > 0) {
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*version = pm_tz_version;
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return 0;
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}
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ret = zynqmp_pm_invoke_fn(PM_GET_TRUSTZONE_VERSION, 0, 0,
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0, 0, ret_payload);
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*version = ret_payload[1];
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return ret;
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}
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/**
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* get_set_conduit_method() - Choose SMC or HVC based communication
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* @np: Pointer to the device_node structure
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*
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* Use SMC or HVC-based functions to communicate with EL2/EL3.
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*
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* Return: Returns 0 on success or error code
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*/
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static int get_set_conduit_method(struct device_node *np)
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{
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const char *method;
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if (of_property_read_string(np, "method", &method)) {
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pr_warn("%s missing \"method\" property\n", __func__);
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return -ENXIO;
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}
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if (!strcmp("hvc", method)) {
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do_fw_call = do_fw_call_hvc;
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} else if (!strcmp("smc", method)) {
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do_fw_call = do_fw_call_smc;
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} else {
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pr_warn("%s Invalid \"method\" property: %s\n",
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__func__, method);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* zynqmp_pm_query_data() - Get query data from firmware
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* @qdata: Variable to the zynqmp_pm_query_data structure
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* @out: Returned output value
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_query_data(struct zynqmp_pm_query_data qdata, u32 *out)
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{
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int ret;
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ret = zynqmp_pm_invoke_fn(PM_QUERY_DATA, qdata.qid, qdata.arg1,
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qdata.arg2, qdata.arg3, out);
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/*
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* For clock name query, all bytes in SMC response are clock name
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* characters and return code is always success. For invalid clocks,
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* clock name bytes would be zeros.
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*/
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return qdata.qid == PM_QID_CLOCK_GET_NAME ? 0 : ret;
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}
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/**
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* zynqmp_pm_clock_enable() - Enable the clock for given id
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* @clock_id: ID of the clock to be enabled
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*
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* This function is used by master to enable the clock
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* including peripherals and PLL clocks.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_enable(u32 clock_id)
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{
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return zynqmp_pm_invoke_fn(PM_CLOCK_ENABLE, clock_id, 0, 0, 0, NULL);
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}
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/**
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* zynqmp_pm_clock_disable() - Disable the clock for given id
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* @clock_id: ID of the clock to be disable
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*
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* This function is used by master to disable the clock
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* including peripherals and PLL clocks.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_disable(u32 clock_id)
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{
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return zynqmp_pm_invoke_fn(PM_CLOCK_DISABLE, clock_id, 0, 0, 0, NULL);
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}
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/**
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* zynqmp_pm_clock_getstate() - Get the clock state for given id
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* @clock_id: ID of the clock to be queried
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* @state: 1/0 (Enabled/Disabled)
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*
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* This function is used by master to get the state of clock
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* including peripherals and PLL clocks.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_getstate(u32 clock_id, u32 *state)
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{
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u32 ret_payload[PAYLOAD_ARG_CNT];
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int ret;
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ret = zynqmp_pm_invoke_fn(PM_CLOCK_GETSTATE, clock_id, 0,
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0, 0, ret_payload);
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*state = ret_payload[1];
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return ret;
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}
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/**
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* zynqmp_pm_clock_setdivider() - Set the clock divider for given id
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* @clock_id: ID of the clock
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* @divider: divider value
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*
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* This function is used by master to set divider for any clock
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* to achieve desired rate.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_setdivider(u32 clock_id, u32 divider)
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{
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return zynqmp_pm_invoke_fn(PM_CLOCK_SETDIVIDER, clock_id, divider,
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0, 0, NULL);
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}
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/**
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* zynqmp_pm_clock_getdivider() - Get the clock divider for given id
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* @clock_id: ID of the clock
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* @divider: divider value
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*
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* This function is used by master to get divider values
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* for any clock.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_getdivider(u32 clock_id, u32 *divider)
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{
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u32 ret_payload[PAYLOAD_ARG_CNT];
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int ret;
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ret = zynqmp_pm_invoke_fn(PM_CLOCK_GETDIVIDER, clock_id, 0,
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0, 0, ret_payload);
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*divider = ret_payload[1];
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return ret;
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}
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/**
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* zynqmp_pm_clock_setrate() - Set the clock rate for given id
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* @clock_id: ID of the clock
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* @rate: rate value in hz
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*
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* This function is used by master to set rate for any clock.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_setrate(u32 clock_id, u64 rate)
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{
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return zynqmp_pm_invoke_fn(PM_CLOCK_SETRATE, clock_id,
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lower_32_bits(rate),
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upper_32_bits(rate),
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0, NULL);
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}
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/**
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* zynqmp_pm_clock_getrate() - Get the clock rate for given id
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* @clock_id: ID of the clock
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* @rate: rate value in hz
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*
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* This function is used by master to get rate
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* for any clock.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_getrate(u32 clock_id, u64 *rate)
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{
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u32 ret_payload[PAYLOAD_ARG_CNT];
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int ret;
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ret = zynqmp_pm_invoke_fn(PM_CLOCK_GETRATE, clock_id, 0,
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0, 0, ret_payload);
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*rate = ((u64)ret_payload[2] << 32) | ret_payload[1];
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return ret;
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}
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/**
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* zynqmp_pm_clock_setparent() - Set the clock parent for given id
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* @clock_id: ID of the clock
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* @parent_id: parent id
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*
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* This function is used by master to set parent for any clock.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_setparent(u32 clock_id, u32 parent_id)
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{
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return zynqmp_pm_invoke_fn(PM_CLOCK_SETPARENT, clock_id,
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parent_id, 0, 0, NULL);
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}
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/**
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* zynqmp_pm_clock_getparent() - Get the clock parent for given id
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* @clock_id: ID of the clock
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* @parent_id: parent id
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*
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* This function is used by master to get parent index
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* for any clock.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_clock_getparent(u32 clock_id, u32 *parent_id)
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{
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u32 ret_payload[PAYLOAD_ARG_CNT];
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int ret;
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ret = zynqmp_pm_invoke_fn(PM_CLOCK_GETPARENT, clock_id, 0,
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0, 0, ret_payload);
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*parent_id = ret_payload[1];
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return ret;
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}
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/**
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* zynqmp_is_valid_ioctl() - Check whether IOCTL ID is valid or not
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* @ioctl_id: IOCTL ID
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*
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* Return: 1 if IOCTL is valid else 0
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*/
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static inline int zynqmp_is_valid_ioctl(u32 ioctl_id)
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{
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switch (ioctl_id) {
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case IOCTL_SET_PLL_FRAC_MODE:
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case IOCTL_GET_PLL_FRAC_MODE:
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case IOCTL_SET_PLL_FRAC_DATA:
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case IOCTL_GET_PLL_FRAC_DATA:
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return 1;
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default:
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return 0;
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}
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}
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/**
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* zynqmp_pm_ioctl() - PM IOCTL API for device control and configs
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* @node_id: Node ID of the device
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* @ioctl_id: ID of the requested IOCTL
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* @arg1: Argument 1 to requested IOCTL call
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* @arg2: Argument 2 to requested IOCTL call
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* @out: Returned output value
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*
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* This function calls IOCTL to firmware for device control and configuration.
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*
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* Return: Returns status, either success or error+reason
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*/
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static int zynqmp_pm_ioctl(u32 node_id, u32 ioctl_id, u32 arg1, u32 arg2,
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u32 *out)
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{
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if (!zynqmp_is_valid_ioctl(ioctl_id))
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return -EINVAL;
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return zynqmp_pm_invoke_fn(PM_IOCTL, node_id, ioctl_id,
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arg1, arg2, out);
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}
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static const struct zynqmp_eemi_ops eemi_ops = {
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.get_api_version = zynqmp_pm_get_api_version,
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.query_data = zynqmp_pm_query_data,
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.clock_enable = zynqmp_pm_clock_enable,
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.clock_disable = zynqmp_pm_clock_disable,
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.clock_getstate = zynqmp_pm_clock_getstate,
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.clock_setdivider = zynqmp_pm_clock_setdivider,
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.clock_getdivider = zynqmp_pm_clock_getdivider,
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.clock_setrate = zynqmp_pm_clock_setrate,
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.clock_getrate = zynqmp_pm_clock_getrate,
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.clock_setparent = zynqmp_pm_clock_setparent,
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.clock_getparent = zynqmp_pm_clock_getparent,
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.ioctl = zynqmp_pm_ioctl,
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};
|
|
|
|
/**
|
|
* zynqmp_pm_get_eemi_ops - Get eemi ops functions
|
|
*
|
|
* Return: Pointer of eemi_ops structure
|
|
*/
|
|
const struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
|
|
{
|
|
return &eemi_ops;
|
|
}
|
|
EXPORT_SYMBOL_GPL(zynqmp_pm_get_eemi_ops);
|
|
|
|
static int zynqmp_firmware_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np;
|
|
int ret;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
|
|
if (!np)
|
|
return 0;
|
|
of_node_put(np);
|
|
|
|
ret = get_set_conduit_method(dev->of_node);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Check PM API version number */
|
|
zynqmp_pm_get_api_version(&pm_api_version);
|
|
if (pm_api_version < ZYNQMP_PM_VERSION) {
|
|
panic("%s Platform Management API version error. Expected: v%d.%d - Found: v%d.%d\n",
|
|
__func__,
|
|
ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR,
|
|
pm_api_version >> 16, pm_api_version & 0xFFFF);
|
|
}
|
|
|
|
pr_info("%s Platform Management API v%d.%d\n", __func__,
|
|
pm_api_version >> 16, pm_api_version & 0xFFFF);
|
|
|
|
/* Check trustzone version number */
|
|
ret = zynqmp_pm_get_trustzone_version(&pm_tz_version);
|
|
if (ret)
|
|
panic("Legacy trustzone found without version support\n");
|
|
|
|
if (pm_tz_version < ZYNQMP_TZ_VERSION)
|
|
panic("%s Trustzone version error. Expected: v%d.%d - Found: v%d.%d\n",
|
|
__func__,
|
|
ZYNQMP_TZ_VERSION_MAJOR, ZYNQMP_TZ_VERSION_MINOR,
|
|
pm_tz_version >> 16, pm_tz_version & 0xFFFF);
|
|
|
|
pr_info("%s Trustzone version v%d.%d\n", __func__,
|
|
pm_tz_version >> 16, pm_tz_version & 0xFFFF);
|
|
|
|
zynqmp_pm_api_debugfs_init();
|
|
|
|
return of_platform_populate(dev->of_node, NULL, NULL, dev);
|
|
}
|
|
|
|
static int zynqmp_firmware_remove(struct platform_device *pdev)
|
|
{
|
|
zynqmp_pm_api_debugfs_exit();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id zynqmp_firmware_of_match[] = {
|
|
{.compatible = "xlnx,zynqmp-firmware"},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, zynqmp_firmware_of_match);
|
|
|
|
static struct platform_driver zynqmp_firmware_driver = {
|
|
.driver = {
|
|
.name = "zynqmp_firmware",
|
|
.of_match_table = zynqmp_firmware_of_match,
|
|
},
|
|
.probe = zynqmp_firmware_probe,
|
|
.remove = zynqmp_firmware_remove,
|
|
};
|
|
module_platform_driver(zynqmp_firmware_driver);
|