1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * RPM over SMD communication wrapper for interconnects 4 * 5 * Copyright (C) 2019 Linaro Ltd 6 * Author: Georgi Djakov <georgi.djakov@linaro.org> 7 */ 8 9 #include <linux/interconnect-provider.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/of_platform.h> 13 #include <linux/platform_device.h> 14 #include <linux/soc/qcom/smd-rpm.h> 15 16 #include "smd-rpm.h" 17 18 #define RPM_KEY_BW 0x00007762 19 20 static struct qcom_smd_rpm *icc_smd_rpm; 21 22 struct icc_rpm_smd_req { 23 __le32 key; 24 __le32 nbytes; 25 __le32 value; 26 }; 27 28 bool qcom_icc_rpm_smd_available(void) 29 { 30 return !!icc_smd_rpm; 31 } 32 EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available); 33 34 int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val) 35 { 36 struct icc_rpm_smd_req req = { 37 .key = cpu_to_le32(RPM_KEY_BW), 38 .nbytes = cpu_to_le32(sizeof(u32)), 39 .value = cpu_to_le32(val), 40 }; 41 42 return qcom_rpm_smd_write(icc_smd_rpm, ctx, rsc_type, id, &req, 43 sizeof(req)); 44 } 45 EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send); 46 47 static int qcom_icc_rpm_smd_remove(struct platform_device *pdev) 48 { 49 icc_smd_rpm = NULL; 50 51 return 0; 52 } 53 54 static int qcom_icc_rpm_smd_probe(struct platform_device *pdev) 55 { 56 icc_smd_rpm = dev_get_drvdata(pdev->dev.parent); 57 58 if (!icc_smd_rpm) { 59 dev_err(&pdev->dev, "unable to retrieve handle to RPM\n"); 60 return -ENODEV; 61 } 62 63 return 0; 64 } 65 66 static struct platform_driver qcom_interconnect_rpm_smd_driver = { 67 .driver = { 68 .name = "icc_smd_rpm", 69 }, 70 .probe = qcom_icc_rpm_smd_probe, 71 .remove = qcom_icc_rpm_smd_remove, 72 }; 73 module_platform_driver(qcom_interconnect_rpm_smd_driver); 74 MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>"); 75 MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect proxy driver"); 76 MODULE_LICENSE("GPL v2"); 77 MODULE_ALIAS("platform:icc_smd_rpm"); 78