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 ipq8074_apcs_data = { 37 .offset = 8, .clk_name = NULL 38 }; 39 40 static const struct qcom_apcs_ipc_data msm8916_apcs_data = { 41 .offset = 8, .clk_name = "qcom-apcs-msm8916-clk" 42 }; 43 44 static const struct qcom_apcs_ipc_data msm8994_apcs_data = { 45 .offset = 8, .clk_name = NULL 46 }; 47 48 static const struct qcom_apcs_ipc_data msm8996_apcs_data = { 49 .offset = 16, .clk_name = NULL 50 }; 51 52 static const struct qcom_apcs_ipc_data msm8998_apcs_data = { 53 .offset = 8, .clk_name = NULL 54 }; 55 56 static const struct qcom_apcs_ipc_data sdm660_apcs_data = { 57 .offset = 8, .clk_name = NULL 58 }; 59 60 static const struct qcom_apcs_ipc_data apps_shared_apcs_data = { 61 .offset = 12, .clk_name = NULL 62 }; 63 64 static const struct regmap_config apcs_regmap_config = { 65 .reg_bits = 32, 66 .reg_stride = 4, 67 .val_bits = 32, 68 .max_register = 0xFFC, 69 .fast_io = true, 70 }; 71 72 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) 73 { 74 struct qcom_apcs_ipc *apcs = container_of(chan->mbox, 75 struct qcom_apcs_ipc, mbox); 76 unsigned long idx = (unsigned long)chan->con_priv; 77 78 return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); 79 } 80 81 static const struct mbox_chan_ops qcom_apcs_ipc_ops = { 82 .send_data = qcom_apcs_ipc_send_data, 83 }; 84 85 static int qcom_apcs_ipc_probe(struct platform_device *pdev) 86 { 87 struct qcom_apcs_ipc *apcs; 88 const struct qcom_apcs_ipc_data *apcs_data; 89 struct regmap *regmap; 90 struct resource *res; 91 void __iomem *base; 92 unsigned long i; 93 int ret; 94 95 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); 96 if (!apcs) 97 return -ENOMEM; 98 99 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 100 base = devm_ioremap_resource(&pdev->dev, res); 101 if (IS_ERR(base)) 102 return PTR_ERR(base); 103 104 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); 105 if (IS_ERR(regmap)) 106 return PTR_ERR(regmap); 107 108 apcs_data = of_device_get_match_data(&pdev->dev); 109 110 apcs->regmap = regmap; 111 apcs->offset = apcs_data->offset; 112 113 /* Initialize channel identifiers */ 114 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) 115 apcs->mbox_chans[i].con_priv = (void *)i; 116 117 apcs->mbox.dev = &pdev->dev; 118 apcs->mbox.ops = &qcom_apcs_ipc_ops; 119 apcs->mbox.chans = apcs->mbox_chans; 120 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); 121 122 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); 123 if (ret) { 124 dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); 125 return ret; 126 } 127 128 if (apcs_data->clk_name) { 129 apcs->clk = platform_device_register_data(&pdev->dev, 130 apcs_data->clk_name, 131 PLATFORM_DEVID_NONE, 132 NULL, 0); 133 if (IS_ERR(apcs->clk)) 134 dev_err(&pdev->dev, "failed to register APCS clk\n"); 135 } 136 137 platform_set_drvdata(pdev, apcs); 138 139 return 0; 140 } 141 142 static int qcom_apcs_ipc_remove(struct platform_device *pdev) 143 { 144 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); 145 struct platform_device *clk = apcs->clk; 146 147 platform_device_unregister(clk); 148 149 return 0; 150 } 151 152 /* .data is the offset of the ipc register within the global block */ 153 static const struct of_device_id qcom_apcs_ipc_of_match[] = { 154 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data }, 155 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data }, 156 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data }, 157 { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data }, 158 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data }, 159 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data }, 160 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data }, 161 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data }, 162 { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data }, 163 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data }, 164 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data }, 165 {} 166 }; 167 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); 168 169 static struct platform_driver qcom_apcs_ipc_driver = { 170 .probe = qcom_apcs_ipc_probe, 171 .remove = qcom_apcs_ipc_remove, 172 .driver = { 173 .name = "qcom_apcs_ipc", 174 .of_match_table = qcom_apcs_ipc_of_match, 175 }, 176 }; 177 178 static int __init qcom_apcs_ipc_init(void) 179 { 180 return platform_driver_register(&qcom_apcs_ipc_driver); 181 } 182 postcore_initcall(qcom_apcs_ipc_init); 183 184 static void __exit qcom_apcs_ipc_exit(void) 185 { 186 platform_driver_unregister(&qcom_apcs_ipc_driver); 187 } 188 module_exit(qcom_apcs_ipc_exit); 189 190 MODULE_LICENSE("GPL v2"); 191 MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); 192