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 enum tpm_tis_io_mode io_mode) 40 { 41 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 42 switch (io_mode) { 43 case TPM_TIS_PHYS_8: 44 while (len--) 45 *result++ = ioread8(phy->iobase + addr); 46 break; 47 case TPM_TIS_PHYS_16: 48 result[1] = ioread8(phy->iobase + addr + 1); 49 result[0] = ioread8(phy->iobase + addr); 50 break; 51 case TPM_TIS_PHYS_32: 52 result[3] = ioread8(phy->iobase + addr + 3); 53 result[2] = ioread8(phy->iobase + addr + 2); 54 result[1] = ioread8(phy->iobase + addr + 1); 55 result[0] = ioread8(phy->iobase + addr); 56 break; 57 } 58 59 return 0; 60 } 61 62 static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr, 63 u16 len, const u8 *value, 64 enum tpm_tis_io_mode io_mode) 65 { 66 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); 67 switch (io_mode) { 68 case TPM_TIS_PHYS_8: 69 while (len--) 70 iowrite8(*value++, phy->iobase + addr); 71 break; 72 case TPM_TIS_PHYS_16: 73 return -EINVAL; 74 case TPM_TIS_PHYS_32: 75 /* 76 * Due to the limitation of SPI controller on SynQuacer, 77 * 16/32 bits access must be done in byte-wise and descending order. 78 */ 79 iowrite8(value[3], phy->iobase + addr + 3); 80 iowrite8(value[2], phy->iobase + addr + 2); 81 iowrite8(value[1], phy->iobase + addr + 1); 82 iowrite8(value[0], phy->iobase + addr); 83 break; 84 } 85 86 return 0; 87 } 88 89 static const struct tpm_tis_phy_ops tpm_tcg_bw = { 90 .read_bytes = tpm_tis_synquacer_read_bytes, 91 .write_bytes = tpm_tis_synquacer_write_bytes, 92 }; 93 94 static int tpm_tis_synquacer_init(struct device *dev, 95 struct tpm_tis_synquacer_info *tpm_info) 96 { 97 struct tpm_tis_synquacer_phy *phy; 98 99 phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL); 100 if (phy == NULL) 101 return -ENOMEM; 102 103 phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); 104 if (IS_ERR(phy->iobase)) 105 return PTR_ERR(phy->iobase); 106 107 return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw, 108 ACPI_HANDLE(dev)); 109 } 110 111 static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume); 112 113 static int tpm_tis_synquacer_probe(struct platform_device *pdev) 114 { 115 struct tpm_tis_synquacer_info tpm_info = {}; 116 struct resource *res; 117 118 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 119 if (res == NULL) { 120 dev_err(&pdev->dev, "no memory resource defined\n"); 121 return -ENODEV; 122 } 123 tpm_info.res = *res; 124 125 tpm_info.irq = -1; 126 127 return tpm_tis_synquacer_init(&pdev->dev, &tpm_info); 128 } 129 130 static void tpm_tis_synquacer_remove(struct platform_device *pdev) 131 { 132 struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); 133 134 tpm_chip_unregister(chip); 135 tpm_tis_remove(chip); 136 } 137 138 #ifdef CONFIG_OF 139 static const struct of_device_id tis_synquacer_of_platform_match[] = { 140 {.compatible = "socionext,synquacer-tpm-mmio"}, 141 {}, 142 }; 143 MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match); 144 #endif 145 146 #ifdef CONFIG_ACPI 147 static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = { 148 { "SCX0009" }, 149 {}, 150 }; 151 MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl); 152 #endif 153 154 static struct platform_driver tis_synquacer_drv = { 155 .probe = tpm_tis_synquacer_probe, 156 .remove_new = tpm_tis_synquacer_remove, 157 .driver = { 158 .name = "tpm_tis_synquacer", 159 .pm = &tpm_tis_synquacer_pm, 160 .of_match_table = of_match_ptr(tis_synquacer_of_platform_match), 161 .acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl), 162 }, 163 }; 164 165 static int __init tpm_tis_synquacer_module_init(void) 166 { 167 int rc; 168 169 rc = platform_driver_register(&tis_synquacer_drv); 170 if (rc) 171 return rc; 172 173 return 0; 174 } 175 176 static void __exit tpm_tis_synquacer_module_exit(void) 177 { 178 platform_driver_unregister(&tis_synquacer_drv); 179 } 180 181 module_init(tpm_tis_synquacer_module_init); 182 module_exit(tpm_tis_synquacer_module_exit); 183 MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform"); 184 MODULE_LICENSE("GPL"); 185