1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2017, Linaro Ltd 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/module.h> 8 #include <linux/io.h> 9 #include <linux/slab.h> 10 #include <linux/of.h> 11 #include <linux/of_platform.h> 12 #include <linux/platform_device.h> 13 #include <linux/regmap.h> 14 #include <linux/mailbox_controller.h> 15 16 #define QCOM_APCS_IPC_BITS 32 17 18 struct qcom_apcs_ipc { 19 struct mbox_controller mbox; 20 struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS]; 21 22 struct regmap *regmap; 23 unsigned long offset; 24 struct platform_device *clk; 25 }; 26 27 struct qcom_apcs_ipc_data { 28 int offset; 29 char *clk_name; 30 }; 31 32 static const struct qcom_apcs_ipc_data ipq6018_apcs_data = { 33 .offset = 8, .clk_name = "qcom,apss-ipq6018-clk" 34 }; 35 36 static const struct qcom_apcs_ipc_data msm8916_apcs_data = { 37 .offset = 8, .clk_name = "qcom-apcs-msm8916-clk" 38 }; 39 40 static const struct qcom_apcs_ipc_data msm8994_apcs_data = { 41 .offset = 8, .clk_name = NULL 42 }; 43 44 static const struct qcom_apcs_ipc_data msm8996_apcs_data = { 45 .offset = 16, .clk_name = "qcom-apcs-msm8996-clk" 46 }; 47 48 static const struct qcom_apcs_ipc_data apps_shared_apcs_data = { 49 .offset = 12, .clk_name = NULL 50 }; 51 52 static const struct qcom_apcs_ipc_data sdx55_apcs_data = { 53 .offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk" 54 }; 55 56 static const struct regmap_config apcs_regmap_config = { 57 .reg_bits = 32, 58 .reg_stride = 4, 59 .val_bits = 32, 60 .max_register = 0x1008, 61 }; 62 63 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) 64 { 65 struct qcom_apcs_ipc *apcs = container_of(chan->mbox, 66 struct qcom_apcs_ipc, mbox); 67 unsigned long idx = (unsigned long)chan->con_priv; 68 69 return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); 70 } 71 72 static const struct mbox_chan_ops qcom_apcs_ipc_ops = { 73 .send_data = qcom_apcs_ipc_send_data, 74 }; 75 76 static int qcom_apcs_ipc_probe(struct platform_device *pdev) 77 { 78 struct qcom_apcs_ipc *apcs; 79 const struct qcom_apcs_ipc_data *apcs_data; 80 struct regmap *regmap; 81 void __iomem *base; 82 unsigned long i; 83 int ret; 84 85 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); 86 if (!apcs) 87 return -ENOMEM; 88 89 base = devm_platform_ioremap_resource(pdev, 0); 90 if (IS_ERR(base)) 91 return PTR_ERR(base); 92 93 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); 94 if (IS_ERR(regmap)) 95 return PTR_ERR(regmap); 96 97 apcs_data = of_device_get_match_data(&pdev->dev); 98 99 apcs->regmap = regmap; 100 apcs->offset = apcs_data->offset; 101 102 /* Initialize channel identifiers */ 103 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) 104 apcs->mbox_chans[i].con_priv = (void *)i; 105 106 apcs->mbox.dev = &pdev->dev; 107 apcs->mbox.ops = &qcom_apcs_ipc_ops; 108 apcs->mbox.chans = apcs->mbox_chans; 109 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); 110 111 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); 112 if (ret) { 113 dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); 114 return ret; 115 } 116 117 if (apcs_data->clk_name) { 118 struct device_node *np = of_get_child_by_name(pdev->dev.of_node, 119 "clock-controller"); 120 struct platform_device_info pdevinfo = { 121 .parent = &pdev->dev, 122 .name = apcs_data->clk_name, 123 .id = PLATFORM_DEVID_AUTO, 124 .fwnode = of_fwnode_handle(np) ?: pdev->dev.fwnode, 125 .of_node_reused = !np, 126 }; 127 128 apcs->clk = platform_device_register_full(&pdevinfo); 129 of_node_put(np); 130 if (IS_ERR(apcs->clk)) 131 dev_err(&pdev->dev, "failed to register APCS clk\n"); 132 } 133 134 platform_set_drvdata(pdev, apcs); 135 136 return 0; 137 } 138 139 static void qcom_apcs_ipc_remove(struct platform_device *pdev) 140 { 141 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); 142 struct platform_device *clk = apcs->clk; 143 144 platform_device_unregister(clk); 145 } 146 147 /* .data is the offset of the ipc register within the global block */ 148 static const struct of_device_id qcom_apcs_ipc_of_match[] = { 149 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data }, 150 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data }, 151 { .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data }, 152 { .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data }, 153 { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data }, 154 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data }, 155 { .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data }, 156 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data }, 157 { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data }, 158 /* Do not add any more entries using existing driver data */ 159 { .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data }, 160 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data }, 161 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data }, 162 { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data }, 163 { .compatible = "qcom,sm4250-apcs-hmss-global", .data = &msm8994_apcs_data }, 164 { .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data }, 165 { .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data }, 166 { .compatible = "qcom,ipq5332-apcs-apps-global", .data = &ipq6018_apcs_data }, 167 { .compatible = "qcom,ipq5424-apcs-apps-global", .data = &msm8994_apcs_data }, 168 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq6018_apcs_data }, 169 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data }, 170 { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data }, 171 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data }, 172 {} 173 }; 174 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); 175 176 static struct platform_driver qcom_apcs_ipc_driver = { 177 .probe = qcom_apcs_ipc_probe, 178 .remove = qcom_apcs_ipc_remove, 179 .driver = { 180 .name = "qcom_apcs_ipc", 181 .of_match_table = qcom_apcs_ipc_of_match, 182 }, 183 }; 184 185 static int __init qcom_apcs_ipc_init(void) 186 { 187 return platform_driver_register(&qcom_apcs_ipc_driver); 188 } 189 postcore_initcall(qcom_apcs_ipc_init); 190 191 static void __exit qcom_apcs_ipc_exit(void) 192 { 193 platform_driver_unregister(&qcom_apcs_ipc_driver); 194 } 195 module_exit(qcom_apcs_ipc_exit); 196 197 MODULE_LICENSE("GPL v2"); 198 MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); 199