1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020 Linaro Ltd. 4 * 5 * This device driver implements MMIO TPM on SynQuacer Platform. 6 */ 7 #include <linux/acpi.h> 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/slab.h> 11 #include <linux/of.h> 12 #include <linux/of_device.h> 13 #include <linux/kernel.h> 14 #include "tpm.h" 15 #include "tpm_tis_core.h" 16 17 /* 18 * irq > 0 means: use irq $irq; 19 * irq = 0 means: autoprobe for an irq; 20 * irq = -1 means: no irq support 21 */ 22 struct tpm_tis_synquacer_info { 23 struct resource res; 24 int irq; 25 }; 26 27 struct tpm_tis_synquacer_phy { 28 struct tpm_tis_data priv; 29 void __iomem *iobase; 30 }; 31 32 static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data) 33 { 34 return container_of(data, struct tpm_tis_synquacer_phy, priv); 35 } 36 37 static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr, 38 u16 len, u8 *result) 39 { 40 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 41 42 while (len--) 43 *result++ = ioread8(phy->iobase + addr); 44 45 return 0; 46 } 47 48 static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr, 49 u16 len, const u8 *value) 50 { 51 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 52 53 while (len--) 54 iowrite8(*value++, phy->iobase + addr); 55 56 return 0; 57 } 58 59 static int tpm_tis_synquacer_read16_bw(struct tpm_tis_data *data, 60 u32 addr, u16 *result) 61 { 62 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 63 64 /* 65 * Due to the limitation of SPI controller on SynQuacer, 66 * 16/32 bits access must be done in byte-wise and descending order. 67 */ 68 *result = (ioread8(phy->iobase + addr + 1) << 8) | 69 (ioread8(phy->iobase + addr)); 70 71 return 0; 72 } 73 74 static int tpm_tis_synquacer_read32_bw(struct tpm_tis_data *data, 75 u32 addr, u32 *result) 76 { 77 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 78 79 /* 80 * Due to the limitation of SPI controller on SynQuacer, 81 * 16/32 bits access must be done in byte-wise and descending order. 82 */ 83 *result = (ioread8(phy->iobase + addr + 3) << 24) | 84 (ioread8(phy->iobase + addr + 2) << 16) | 85 (ioread8(phy->iobase + addr + 1) << 8) | 86 (ioread8(phy->iobase + addr)); 87 88 return 0; 89 } 90 91 static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data, 92 u32 addr, u32 value) 93 { 94 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 95 96 /* 97 * Due to the limitation of SPI controller on SynQuacer, 98 * 16/32 bits access must be done in byte-wise and descending order. 99 */ 100 iowrite8(value >> 24, phy->iobase + addr + 3); 101 iowrite8(value >> 16, phy->iobase + addr + 2); 102 iowrite8(value >> 8, phy->iobase + addr + 1); 103 iowrite8(value, phy->iobase + addr); 104 105 return 0; 106 } 107 108 static const struct tpm_tis_phy_ops tpm_tcg_bw = { 109 .read_bytes = tpm_tis_synquacer_read_bytes, 110 .write_bytes = tpm_tis_synquacer_write_bytes, 111 .read16 = tpm_tis_synquacer_read16_bw, 112 .read32 = tpm_tis_synquacer_read32_bw, 113 .write32 = tpm_tis_synquacer_write32_bw, 114 }; 115 116 static int tpm_tis_synquacer_init(struct device *dev, 117 struct tpm_tis_synquacer_info *tpm_info) 118 { 119 struct tpm_tis_synquacer_phy *phy; 120 121 phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL); 122 if (phy == NULL) 123 return -ENOMEM; 124 125 phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); 126 if (IS_ERR(phy->iobase)) 127 return PTR_ERR(phy->iobase); 128 129 return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw, 130 ACPI_HANDLE(dev)); 131 } 132 133 static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume); 134 135 static int tpm_tis_synquacer_probe(struct platform_device *pdev) 136 { 137 struct tpm_tis_synquacer_info tpm_info = {}; 138 struct resource *res; 139 140 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 141 if (res == NULL) { 142 dev_err(&pdev->dev, "no memory resource defined\n"); 143 return -ENODEV; 144 } 145 tpm_info.res = *res; 146 147 tpm_info.irq = -1; 148 149 return tpm_tis_synquacer_init(&pdev->dev, &tpm_info); 150 } 151 152 static int tpm_tis_synquacer_remove(struct platform_device *pdev) 153 { 154 struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); 155 156 tpm_chip_unregister(chip); 157 tpm_tis_remove(chip); 158 159 return 0; 160 } 161 162 #ifdef CONFIG_OF 163 static const struct of_device_id tis_synquacer_of_platform_match[] = { 164 {.compatible = "socionext,synquacer-tpm-mmio"}, 165 {}, 166 }; 167 MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match); 168 #endif 169 170 #ifdef CONFIG_ACPI 171 static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = { 172 { "SCX0009" }, 173 {}, 174 }; 175 MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl); 176 #endif 177 178 static struct platform_driver tis_synquacer_drv = { 179 .probe = tpm_tis_synquacer_probe, 180 .remove = tpm_tis_synquacer_remove, 181 .driver = { 182 .name = "tpm_tis_synquacer", 183 .pm = &tpm_tis_synquacer_pm, 184 .of_match_table = of_match_ptr(tis_synquacer_of_platform_match), 185 .acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl), 186 }, 187 }; 188 189 static int __init tpm_tis_synquacer_module_init(void) 190 { 191 int rc; 192 193 rc = platform_driver_register(&tis_synquacer_drv); 194 if (rc) 195 return rc; 196 197 return 0; 198 } 199 200 static void __exit tpm_tis_synquacer_module_exit(void) 201 { 202 platform_driver_unregister(&tis_synquacer_drv); 203 } 204 205 module_init(tpm_tis_synquacer_module_init); 206 module_exit(tpm_tis_synquacer_module_exit); 207 MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform"); 208 MODULE_LICENSE("GPL"); 209