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 static const struct regmap_config apcs_regmap_config = { 28 .reg_bits = 32, 29 .reg_stride = 4, 30 .val_bits = 32, 31 .max_register = 0xFFC, 32 .fast_io = true, 33 }; 34 35 static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data) 36 { 37 struct qcom_apcs_ipc *apcs = container_of(chan->mbox, 38 struct qcom_apcs_ipc, mbox); 39 unsigned long idx = (unsigned long)chan->con_priv; 40 41 return regmap_write(apcs->regmap, apcs->offset, BIT(idx)); 42 } 43 44 static const struct mbox_chan_ops qcom_apcs_ipc_ops = { 45 .send_data = qcom_apcs_ipc_send_data, 46 }; 47 48 static int qcom_apcs_ipc_probe(struct platform_device *pdev) 49 { 50 struct qcom_apcs_ipc *apcs; 51 struct regmap *regmap; 52 struct resource *res; 53 unsigned long offset; 54 void __iomem *base; 55 unsigned long i; 56 int ret; 57 const struct of_device_id apcs_clk_match_table[] = { 58 { .compatible = "qcom,msm8916-apcs-kpss-global", }, 59 { .compatible = "qcom,qcs404-apcs-apps-global", }, 60 {} 61 }; 62 63 apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL); 64 if (!apcs) 65 return -ENOMEM; 66 67 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 68 base = devm_ioremap_resource(&pdev->dev, res); 69 if (IS_ERR(base)) 70 return PTR_ERR(base); 71 72 regmap = devm_regmap_init_mmio(&pdev->dev, base, &apcs_regmap_config); 73 if (IS_ERR(regmap)) 74 return PTR_ERR(regmap); 75 76 offset = (unsigned long)of_device_get_match_data(&pdev->dev); 77 78 apcs->regmap = regmap; 79 apcs->offset = offset; 80 81 /* Initialize channel identifiers */ 82 for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++) 83 apcs->mbox_chans[i].con_priv = (void *)i; 84 85 apcs->mbox.dev = &pdev->dev; 86 apcs->mbox.ops = &qcom_apcs_ipc_ops; 87 apcs->mbox.chans = apcs->mbox_chans; 88 apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans); 89 90 ret = devm_mbox_controller_register(&pdev->dev, &apcs->mbox); 91 if (ret) { 92 dev_err(&pdev->dev, "failed to register APCS IPC controller\n"); 93 return ret; 94 } 95 96 if (of_match_device(apcs_clk_match_table, &pdev->dev)) { 97 apcs->clk = platform_device_register_data(&pdev->dev, 98 "qcom-apcs-msm8916-clk", 99 PLATFORM_DEVID_NONE, 100 NULL, 0); 101 if (IS_ERR(apcs->clk)) 102 dev_err(&pdev->dev, "failed to register APCS clk\n"); 103 } 104 105 platform_set_drvdata(pdev, apcs); 106 107 return 0; 108 } 109 110 static int qcom_apcs_ipc_remove(struct platform_device *pdev) 111 { 112 struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev); 113 struct platform_device *clk = apcs->clk; 114 115 platform_device_unregister(clk); 116 117 return 0; 118 } 119 120 /* .data is the offset of the ipc register within the global block */ 121 static const struct of_device_id qcom_apcs_ipc_of_match[] = { 122 { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 }, 123 { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 }, 124 { .compatible = "qcom,msm8998-apcs-hmss-global", .data = (void *)8 }, 125 { .compatible = "qcom,qcs404-apcs-apps-global", .data = (void *)8 }, 126 { .compatible = "qcom,sc7180-apss-shared", .data = (void *)12 }, 127 { .compatible = "qcom,sdm845-apss-shared", .data = (void *)12 }, 128 { .compatible = "qcom,sm8150-apss-shared", .data = (void *)12 }, 129 { .compatible = "qcom,ipq8074-apcs-apps-global", .data = (void *)8 }, 130 {} 131 }; 132 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match); 133 134 static struct platform_driver qcom_apcs_ipc_driver = { 135 .probe = qcom_apcs_ipc_probe, 136 .remove = qcom_apcs_ipc_remove, 137 .driver = { 138 .name = "qcom_apcs_ipc", 139 .of_match_table = qcom_apcs_ipc_of_match, 140 }, 141 }; 142 143 static int __init qcom_apcs_ipc_init(void) 144 { 145 return platform_driver_register(&qcom_apcs_ipc_driver); 146 } 147 postcore_initcall(qcom_apcs_ipc_init); 148 149 static void __exit qcom_apcs_ipc_exit(void) 150 { 151 platform_driver_unregister(&qcom_apcs_ipc_driver); 152 } 153 module_exit(qcom_apcs_ipc_exit); 154 155 MODULE_LICENSE("GPL v2"); 156 MODULE_DESCRIPTION("Qualcomm APCS IPC driver"); 157