1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AMD Secure Processor device driver 4 * 5 * Copyright (C) 2014,2018 Advanced Micro Devices, Inc. 6 * 7 * Author: Tom Lendacky <thomas.lendacky@amd.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/device.h> 13 #include <linux/platform_device.h> 14 #include <linux/ioport.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/kthread.h> 17 #include <linux/sched.h> 18 #include <linux/interrupt.h> 19 #include <linux/spinlock.h> 20 #include <linux/delay.h> 21 #include <linux/ccp.h> 22 #include <linux/of.h> 23 #include <linux/of_address.h> 24 #include <linux/acpi.h> 25 26 #include "ccp-dev.h" 27 28 struct sp_platform { 29 int coherent; 30 unsigned int irq_count; 31 }; 32 33 static const struct sp_dev_vdata dev_vdata[] = { 34 { 35 .bar = 0, 36 #ifdef CONFIG_CRYPTO_DEV_SP_CCP 37 .ccp_vdata = &ccpv3_platform, 38 #endif 39 }, 40 }; 41 42 static const struct acpi_device_id sp_acpi_match[] = { 43 { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] }, 44 { }, 45 }; 46 MODULE_DEVICE_TABLE(acpi, sp_acpi_match); 47 48 static const struct of_device_id sp_of_match[] = { 49 { .compatible = "amd,ccp-seattle-v1a", 50 .data = (const void *)&dev_vdata[0] }, 51 { }, 52 }; 53 MODULE_DEVICE_TABLE(of, sp_of_match); 54 55 static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev) 56 { 57 const struct of_device_id *match; 58 59 match = of_match_node(sp_of_match, pdev->dev.of_node); 60 if (match && match->data) 61 return (struct sp_dev_vdata *)match->data; 62 63 return NULL; 64 } 65 66 static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev) 67 { 68 const struct acpi_device_id *match; 69 70 match = acpi_match_device(sp_acpi_match, &pdev->dev); 71 if (match && match->driver_data) 72 return (struct sp_dev_vdata *)match->driver_data; 73 74 return NULL; 75 } 76 77 static int sp_get_irqs(struct sp_device *sp) 78 { 79 struct sp_platform *sp_platform = sp->dev_specific; 80 struct device *dev = sp->dev; 81 struct platform_device *pdev = to_platform_device(dev); 82 int ret; 83 84 sp_platform->irq_count = platform_irq_count(pdev); 85 86 ret = platform_get_irq(pdev, 0); 87 if (ret < 0) { 88 dev_notice(dev, "unable to get IRQ (%d)\n", ret); 89 return ret; 90 } 91 92 sp->psp_irq = ret; 93 if (sp_platform->irq_count == 1) { 94 sp->ccp_irq = ret; 95 } else { 96 ret = platform_get_irq(pdev, 1); 97 if (ret < 0) { 98 dev_notice(dev, "unable to get IRQ (%d)\n", ret); 99 return ret; 100 } 101 102 sp->ccp_irq = ret; 103 } 104 105 return 0; 106 } 107 108 static int sp_platform_probe(struct platform_device *pdev) 109 { 110 struct sp_device *sp; 111 struct sp_platform *sp_platform; 112 struct device *dev = &pdev->dev; 113 enum dev_dma_attr attr; 114 int ret; 115 116 ret = -ENOMEM; 117 sp = sp_alloc_struct(dev); 118 if (!sp) 119 goto e_err; 120 121 sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL); 122 if (!sp_platform) 123 goto e_err; 124 125 sp->dev_specific = sp_platform; 126 sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev) 127 : sp_get_acpi_version(pdev); 128 if (!sp->dev_vdata) { 129 ret = -ENODEV; 130 dev_err(dev, "missing driver data\n"); 131 goto e_err; 132 } 133 134 sp->io_map = devm_platform_ioremap_resource(pdev, 0); 135 if (IS_ERR(sp->io_map)) { 136 ret = PTR_ERR(sp->io_map); 137 goto e_err; 138 } 139 140 attr = device_get_dma_attr(dev); 141 if (attr == DEV_DMA_NOT_SUPPORTED) { 142 dev_err(dev, "DMA is not supported"); 143 goto e_err; 144 } 145 146 sp_platform->coherent = (attr == DEV_DMA_COHERENT); 147 if (sp_platform->coherent) 148 sp->axcache = CACHE_WB_NO_ALLOC; 149 else 150 sp->axcache = CACHE_NONE; 151 152 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); 153 if (ret) { 154 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret); 155 goto e_err; 156 } 157 158 ret = sp_get_irqs(sp); 159 if (ret) 160 goto e_err; 161 162 dev_set_drvdata(dev, sp); 163 164 ret = sp_init(sp); 165 if (ret) 166 goto e_err; 167 168 dev_notice(dev, "enabled\n"); 169 170 return 0; 171 172 e_err: 173 dev_notice(dev, "initialization failed\n"); 174 return ret; 175 } 176 177 static void sp_platform_remove(struct platform_device *pdev) 178 { 179 struct device *dev = &pdev->dev; 180 struct sp_device *sp = dev_get_drvdata(dev); 181 182 sp_destroy(sp); 183 184 dev_notice(dev, "disabled\n"); 185 } 186 187 #ifdef CONFIG_PM 188 static int sp_platform_suspend(struct platform_device *pdev, 189 pm_message_t state) 190 { 191 struct device *dev = &pdev->dev; 192 struct sp_device *sp = dev_get_drvdata(dev); 193 194 return sp_suspend(sp); 195 } 196 197 static int sp_platform_resume(struct platform_device *pdev) 198 { 199 struct device *dev = &pdev->dev; 200 struct sp_device *sp = dev_get_drvdata(dev); 201 202 return sp_resume(sp); 203 } 204 #endif 205 206 static struct platform_driver sp_platform_driver = { 207 .driver = { 208 .name = "ccp", 209 .acpi_match_table = sp_acpi_match, 210 .of_match_table = sp_of_match, 211 }, 212 .probe = sp_platform_probe, 213 .remove_new = sp_platform_remove, 214 #ifdef CONFIG_PM 215 .suspend = sp_platform_suspend, 216 .resume = sp_platform_resume, 217 #endif 218 }; 219 220 int sp_platform_init(void) 221 { 222 return platform_driver_register(&sp_platform_driver); 223 } 224 225 void sp_platform_exit(void) 226 { 227 platform_driver_unregister(&sp_platform_driver); 228 } 229