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 .fast_io = true, 62 }; 63 64 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) 65 { 66 struct qcom_apcs_ipc *apcs = container_of(chan->mbox, 67 struct qcom_apcs_ipc, mbox); 68 unsigned long idx = (unsigned long)chan->con_priv; 69 70 return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); 71 } 72 73 static const struct mbox_chan_ops qcom_apcs_ipc_ops = { 74 .send_data = qcom_apcs_ipc_send_data, 75 }; 76 77 static int qcom_apcs_ipc_probe(struct platform_device *pdev) 78 { 79 struct qcom_apcs_ipc *apcs; 80 const struct qcom_apcs_ipc_data *apcs_data; 81 struct regmap *regmap; 82 void __iomem *base; 83 unsigned long i; 84 int ret; 85 86 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); 87 if (!apcs) 88 return -ENOMEM; 89 90 base = devm_platform_ioremap_resource(pdev, 0); 91 if (IS_ERR(base)) 92 return PTR_ERR(base); 93 94 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); 95 if (IS_ERR(regmap)) 96 return PTR_ERR(regmap); 97 98 apcs_data = of_device_get_match_data(&pdev->dev); 99 100 apcs->regmap = regmap; 101 apcs->offset = apcs_data->offset; 102 103 /* Initialize channel identifiers */ 104 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) 105 apcs->mbox_chans[i].con_priv = (void *)i; 106 107 apcs->mbox.dev = &pdev->dev; 108 apcs->mbox.ops = &qcom_apcs_ipc_ops; 109 apcs->mbox.chans = apcs->mbox_chans; 110 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); 111 112 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); 113 if (ret) { 114 dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); 115 return ret; 116 } 117 118 if (apcs_data->clk_name) { 119 struct device_node *np = of_get_child_by_name(pdev->dev.of_node, 120 "clock-controller"); 121 struct platform_device_info pdevinfo = { 122 .parent = &pdev->dev, 123 .name = apcs_data->clk_name, 124 .id = PLATFORM_DEVID_AUTO, 125 .fwnode = of_fwnode_handle(np) ?: pdev->dev.fwnode, 126 .of_node_reused = !np, 127 }; 128 129 apcs->clk = platform_device_register_full(&pdevinfo); 130 of_node_put(np); 131 if (IS_ERR(apcs->clk)) 132 dev_err(&pdev->dev, "failed to register APCS clk\n"); 133 } 134 135 platform_set_drvdata(pdev, apcs); 136 137 return 0; 138 } 139 140 static void qcom_apcs_ipc_remove(struct platform_device *pdev) 141 { 142 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); 143 struct platform_device *clk = apcs->clk; 144 145 platform_device_unregister(clk); 146 } 147 148 /* .data is the offset of the ipc register within the global block */ 149 static const struct of_device_id qcom_apcs_ipc_of_match[] = { 150 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data }, 151 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data }, 152 { .compatible = "qcom,msm8939-apcs-kpss-global", .data = &msm8916_apcs_data }, 153 { .compatible = "qcom,msm8953-apcs-kpss-global", .data = &msm8994_apcs_data }, 154 { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data }, 155 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data }, 156 { .compatible = "qcom,qcm2290-apcs-hmss-global", .data = &msm8994_apcs_data }, 157 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data }, 158 { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data }, 159 /* Do not add any more entries using existing driver data */ 160 { .compatible = "qcom,msm8976-apcs-kpss-global", .data = &msm8994_apcs_data }, 161 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8994_apcs_data }, 162 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data }, 163 { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &msm8994_apcs_data }, 164 { .compatible = "qcom,sm4250-apcs-hmss-global", .data = &msm8994_apcs_data }, 165 { .compatible = "qcom,sm6125-apcs-hmss-global", .data = &msm8994_apcs_data }, 166 { .compatible = "qcom,sm6115-apcs-hmss-global", .data = &msm8994_apcs_data }, 167 { .compatible = "qcom,ipq5332-apcs-apps-global", .data = &ipq6018_apcs_data }, 168 { .compatible = "qcom,ipq5424-apcs-apps-global", .data = &msm8994_apcs_data }, 169 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq6018_apcs_data }, 170 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data }, 171 { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data }, 172 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data }, 173 {} 174 }; 175 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); 176 177 static struct platform_driver qcom_apcs_ipc_driver = { 178 .probe = qcom_apcs_ipc_probe, 179 .remove = qcom_apcs_ipc_remove, 180 .driver = { 181 .name = "qcom_apcs_ipc", 182 .of_match_table = qcom_apcs_ipc_of_match, 183 }, 184 }; 185 186 static int __init qcom_apcs_ipc_init(void) 187 { 188 return platform_driver_register(&qcom_apcs_ipc_driver); 189 } 190 postcore_initcall(qcom_apcs_ipc_init); 191 192 static void __exit qcom_apcs_ipc_exit(void) 193 { 194 platform_driver_unregister(&qcom_apcs_ipc_driver); 195 } 196 module_exit(qcom_apcs_ipc_exit); 197 198 MODULE_LICENSE("GPL v2"); 199 MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); 200