1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2018, The Linux Foundation. All rights reserved. 3 4 #include <linux/kernel.h> 5 #include <linux/init.h> 6 #include <linux/module.h> 7 #include <linux/platform_device.h> 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/of.h> 11 #include <linux/of_device.h> 12 #include <linux/clk.h> 13 #include <linux/clk-provider.h> 14 15 static const char *aux_parents[] = { 16 "pll8_vote", 17 "pxo", 18 }; 19 20 static const u32 aux_parent_map[] = { 21 3, 22 0, 23 }; 24 25 static const struct of_device_id kpss_xcc_match_table[] = { 26 { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL }, 27 { .compatible = "qcom,kpss-gcc" }, 28 {} 29 }; 30 MODULE_DEVICE_TABLE(of, kpss_xcc_match_table); 31 32 static int kpss_xcc_driver_probe(struct platform_device *pdev) 33 { 34 const struct of_device_id *id; 35 struct clk *clk; 36 void __iomem *base; 37 const char *name; 38 39 id = of_match_device(kpss_xcc_match_table, &pdev->dev); 40 if (!id) 41 return -ENODEV; 42 43 base = devm_platform_ioremap_resource(pdev, 0); 44 if (IS_ERR(base)) 45 return PTR_ERR(base); 46 47 if (id->data) { 48 if (of_property_read_string_index(pdev->dev.of_node, 49 "clock-output-names", 50 0, &name)) 51 return -ENODEV; 52 base += 0x14; 53 } else { 54 name = "acpu_l2_aux"; 55 base += 0x28; 56 } 57 58 clk = clk_register_mux_table(&pdev->dev, name, aux_parents, 59 ARRAY_SIZE(aux_parents), 0, base, 0, 0x3, 60 0, aux_parent_map, NULL); 61 62 platform_set_drvdata(pdev, clk); 63 64 return PTR_ERR_OR_ZERO(clk); 65 } 66 67 static int kpss_xcc_driver_remove(struct platform_device *pdev) 68 { 69 clk_unregister_mux(platform_get_drvdata(pdev)); 70 return 0; 71 } 72 73 static struct platform_driver kpss_xcc_driver = { 74 .probe = kpss_xcc_driver_probe, 75 .remove = kpss_xcc_driver_remove, 76 .driver = { 77 .name = "kpss-xcc", 78 .of_match_table = kpss_xcc_match_table, 79 }, 80 }; 81 module_platform_driver(kpss_xcc_driver); 82 83 MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver"); 84 MODULE_LICENSE("GPL v2"); 85 MODULE_ALIAS("platform:kpss-xcc"); 86