1 // SPDX-License-Identifier: GPL-2.0-only
10  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
12  * Device driver for TCG/TCPA TPM (trusted platform module).
15  * This device driver implements the TPM interface as defined in
16  * the TCG TPM Interface Spec version 1.2, revision 1.0.
29 #include "tpm.h"
36 	 * irq = -1 means: no irq support
54  * TPM MMIO base address.
65  * Write a byte word to the TPM MMIO address, and flush the write queue.
78  * Write a 32-bit word to the TPM MMIO address, and flush the write queue.
109 	list_for_each_entry(id, &dev->pnp.ids, list)  in has_hid()
110 		if (!strcmp(hid, id->id))  in has_hid()
145 	if (!aid || aid->driver_data != DEVICE_IS_TPM2)  in check_acpi_tpm2()
152 	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {  in check_acpi_tpm2()
154 		return -EINVAL;  in check_acpi_tpm2()
158 	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)  in check_acpi_tpm2()
159 		ret = -ENODEV;  in check_acpi_tpm2()
180 		while (len--)  in tpm_tcg_read_bytes()
181 			*result++ = ioread8(phy->iobase + addr);  in tpm_tcg_read_bytes()
184 		result_le16 = cpu_to_le16(ioread16(phy->iobase + addr));  in tpm_tcg_read_bytes()
188 		result_le32 = cpu_to_le32(ioread32(phy->iobase + addr));  in tpm_tcg_read_bytes()
203 		while (len--)  in tpm_tcg_write_bytes()
204 			tpm_tis_iowrite8(*value++, phy->iobase, addr);  in tpm_tcg_write_bytes()
207 		return -EINVAL;  in tpm_tcg_write_bytes()
209 		tpm_tis_iowrite32(le32_to_cpu(*((__le32 *)value)), phy->iobase, addr);  in tpm_tcg_write_bytes()
224 	int irq = -1;  in tpm_tis_init()
233 		return -ENOMEM;  in tpm_tis_init()
235 	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);  in tpm_tis_init()
236 	if (IS_ERR(phy->iobase))  in tpm_tis_init()
237 		return PTR_ERR(phy->iobase);  in tpm_tis_init()
240 		irq = tpm_info->irq;  in tpm_tis_init()
243 		set_bit(TPM_TIS_ITPM_WORKAROUND, &phy->priv.flags);  in tpm_tis_init()
245 	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,  in tpm_tis_init()
259 		return -ENODEV;  in tpm_tis_pnp_init()
265 		tpm_info.irq = -1;  in tpm_tis_pnp_init()
267 	return tpm_tis_init(&pnp_dev->dev, &tpm_info);  in tpm_tis_pnp_init()
271  * There is a known bug caused by 93e1b7d42e1e ("[PATCH] tpm: add HID module
278 	{"PNP0C31", 0},		/* TPM */
309 #define TIS_HID_USR_IDX (ARRAY_SIZE(tpm_pnp_tbl) - 2)
323 		dev_err(&pdev->dev, "no memory resource defined\n");  in tpm_tis_plat_probe()
324 		return -ENODEV;  in tpm_tis_plat_probe()
331 			tpm_info.irq = -1;  in tpm_tis_plat_probe()
337 	return tpm_tis_init(&pdev->dev, &tpm_info);  in tpm_tis_plat_probe()
342 	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);  in tpm_tis_plat_remove()
351 	{.compatible = "tcg,tpm-tis-mmio"},
382 	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,  in tpm_tis_force_device()
433 MODULE_DESCRIPTION("TPM Driver");