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 msm8996_apcs_data = { 45 .offset = 16, .clk_name = NULL 46 }; 47 48 static const struct qcom_apcs_ipc_data msm8998_apcs_data = { 49 .offset = 8, .clk_name = NULL 50 }; 51 52 static const struct qcom_apcs_ipc_data apps_shared_apcs_data = { 53 .offset = 12, .clk_name = NULL 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 = 0xFFC, 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 struct resource *res; 83 void __iomem *base; 84 unsigned long i; 85 int ret; 86 87 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); 88 if (!apcs) 89 return -ENOMEM; 90 91 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 92 base = devm_ioremap_resource(&pdev->dev, res); 93 if (IS_ERR(base)) 94 return PTR_ERR(base); 95 96 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); 97 if (IS_ERR(regmap)) 98 return PTR_ERR(regmap); 99 100 apcs_data = of_device_get_match_data(&pdev->dev); 101 102 apcs->regmap = regmap; 103 apcs->offset = apcs_data->offset; 104 105 /* Initialize channel identifiers */ 106 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) 107 apcs->mbox_chans[i].con_priv = (void *)i; 108 109 apcs->mbox.dev = &pdev->dev; 110 apcs->mbox.ops = &qcom_apcs_ipc_ops; 111 apcs->mbox.chans = apcs->mbox_chans; 112 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); 113 114 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); 115 if (ret) { 116 dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); 117 return ret; 118 } 119 120 if (apcs_data->clk_name) { 121 apcs->clk = platform_device_register_data(&pdev->dev, 122 apcs_data->clk_name, 123 PLATFORM_DEVID_NONE, 124 NULL, 0); 125 if (IS_ERR(apcs->clk)) 126 dev_err(&pdev->dev, "failed to register APCS clk\n"); 127 } 128 129 platform_set_drvdata(pdev, apcs); 130 131 return 0; 132 } 133 134 static int qcom_apcs_ipc_remove(struct platform_device *pdev) 135 { 136 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); 137 struct platform_device *clk = apcs->clk; 138 139 platform_device_unregister(clk); 140 141 return 0; 142 } 143 144 /* .data is the offset of the ipc register within the global block */ 145 static const struct of_device_id qcom_apcs_ipc_of_match[] = { 146 { .compatible = "qcom,ipq6018-apcs-apps-global", .data = &ipq6018_apcs_data }, 147 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = &ipq8074_apcs_data }, 148 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = &msm8916_apcs_data }, 149 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = &msm8996_apcs_data }, 150 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data }, 151 { .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data }, 152 { .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data }, 153 { .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data }, 154 { .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data }, 155 {} 156 }; 157 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); 158 159 static struct platform_driver qcom_apcs_ipc_driver = { 160 .probe = qcom_apcs_ipc_probe, 161 .remove = qcom_apcs_ipc_remove, 162 .driver = { 163 .name = "qcom_apcs_ipc", 164 .of_match_table = qcom_apcs_ipc_of_match, 165 }, 166 }; 167 168 static int __init qcom_apcs_ipc_init(void) 169 { 170 return platform_driver_register(&qcom_apcs_ipc_driver); 171 } 172 postcore_initcall(qcom_apcs_ipc_init); 173 174 static void __exit qcom_apcs_ipc_exit(void) 175 { 176 platform_driver_unregister(&qcom_apcs_ipc_driver); 177 } 178 module_exit(qcom_apcs_ipc_exit); 179 180 MODULE_LICENSE("GPL v2"); 181 MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); 182