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 qcom_apcs_ipc_data sdx55_apcs_data = { 65 .offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk" 66 }; 67 68 static const struct regmap_config apcs_regmap_config = { 69 .reg_bits = 32, 70 .reg_stride = 4, 71 .val_bits = 32, 72 .max_register = 0x1008, 73 .fast_io = true, 74 }; 75 76 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) 77 { 78 struct qcom_apcs_ipc *apcs = container_of(chan->mbox, 79 struct qcom_apcs_ipc, mbox); 80 unsigned long idx = (unsigned long)chan->con_priv; 81 82 return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); 83 } 84 85 static const struct mbox_chan_ops qcom_apcs_ipc_ops = { 86 .send_data = qcom_apcs_ipc_send_data, 87 }; 88 89 static int qcom_apcs_ipc_probe(struct platform_device *pdev) 90 { 91 struct qcom_apcs_ipc *apcs; 92 const struct qcom_apcs_ipc_data *apcs_data; 93 struct regmap *regmap; 94 struct resource *res; 95 void __iomem *base; 96 unsigned long i; 97 int ret; 98 99 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); 100 if (!apcs) 101 return -ENOMEM; 102 103 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 104 base = devm_ioremap_resource(&pdev->dev, res); 105 if (IS_ERR(base)) 106 return PTR_ERR(base); 107 108 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); 109 if (IS_ERR(regmap)) 110 return PTR_ERR(regmap); 111 112 apcs_data = of_device_get_match_data(&pdev->dev); 113 114 apcs->regmap = regmap; 115 apcs->offset = apcs_data->offset; 116 117 /* Initialize channel identifiers */ 118 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) 119 apcs->mbox_chans[i].con_priv = (void *)i; 120 121 apcs->mbox.dev = &pdev->dev; 122 apcs->mbox.ops = &qcom_apcs_ipc_ops; 123 apcs->mbox.chans = apcs->mbox_chans; 124 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); 125 126 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); 127 if (ret) { 128 dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); 129 return ret; 130 } 131 132 if (apcs_data->clk_name) { 133 apcs->clk = platform_device_register_data(&pdev->dev, 134 apcs_data->clk_name, 135 PLATFORM_DEVID_NONE, 136 NULL, 0); 137 if (IS_ERR(apcs->clk)) 138 dev_err(&pdev->dev, "failed to register APCS clk\n"); 139 } 140 141 platform_set_drvdata(pdev, apcs); 142 143 return 0; 144 } 145 146 static int qcom_apcs_ipc_remove(struct platform_device *pdev) 147 { 148 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); 149 struct platform_device *clk = apcs->clk; 150 151 platform_device_unregister(clk); 152 153 return 0; 154 } 155 156 /* .data is the offset of the ipc register within the global block */ 157 static const struct of_device_id qcom_apcs_ipc_of_match[] = { 158 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data }, 159 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data }, 160 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data }, 161 { .compatible = "qcom,msm8994-apcs-kpss-global", .data = &msm8994_apcs_data }, 162 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data }, 163 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data }, 164 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data }, 165 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data }, 166 { .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data }, 167 { .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data }, 168 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data }, 169 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data }, 170 { .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data }, 171 {} 172 }; 173 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); 174 175 static struct platform_driver qcom_apcs_ipc_driver = { 176 .probe = qcom_apcs_ipc_probe, 177 .remove = qcom_apcs_ipc_remove, 178 .driver = { 179 .name = "qcom_apcs_ipc", 180 .of_match_table = qcom_apcs_ipc_of_match, 181 }, 182 }; 183 184 static int __init qcom_apcs_ipc_init(void) 185 { 186 return platform_driver_register(&qcom_apcs_ipc_driver); 187 } 188 postcore_initcall(qcom_apcs_ipc_init); 189 190 static void __exit qcom_apcs_ipc_exit(void) 191 { 192 platform_driver_unregister(&qcom_apcs_ipc_driver); 193 } 194 module_exit(qcom_apcs_ipc_exit); 195 196 MODULE_LICENSE("GPL v2"); 197 MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); 198