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208 lines
5.1 KiB
208 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2020 Linaro Ltd. |
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* |
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* This device driver implements MMIO TPM on SynQuacer Platform. |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/kernel.h> |
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#include "tpm.h" |
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#include "tpm_tis_core.h" |
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/* |
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* irq > 0 means: use irq $irq; |
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* irq = 0 means: autoprobe for an irq; |
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* irq = -1 means: no irq support |
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*/ |
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struct tpm_tis_synquacer_info { |
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struct resource res; |
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int irq; |
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}; |
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struct tpm_tis_synquacer_phy { |
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struct tpm_tis_data priv; |
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void __iomem *iobase; |
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}; |
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static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data) |
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{ |
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return container_of(data, struct tpm_tis_synquacer_phy, priv); |
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} |
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static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr, |
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u16 len, u8 *result) |
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{ |
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); |
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while (len--) |
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*result++ = ioread8(phy->iobase + addr); |
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return 0; |
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} |
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static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr, |
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u16 len, const u8 *value) |
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{ |
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); |
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while (len--) |
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iowrite8(*value++, phy->iobase + addr); |
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return 0; |
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} |
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static int tpm_tis_synquacer_read16_bw(struct tpm_tis_data *data, |
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u32 addr, u16 *result) |
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{ |
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); |
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/* |
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* Due to the limitation of SPI controller on SynQuacer, |
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* 16/32 bits access must be done in byte-wise and descending order. |
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*/ |
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*result = (ioread8(phy->iobase + addr + 1) << 8) | |
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(ioread8(phy->iobase + addr)); |
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return 0; |
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} |
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static int tpm_tis_synquacer_read32_bw(struct tpm_tis_data *data, |
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u32 addr, u32 *result) |
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{ |
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); |
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/* |
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* Due to the limitation of SPI controller on SynQuacer, |
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* 16/32 bits access must be done in byte-wise and descending order. |
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*/ |
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*result = (ioread8(phy->iobase + addr + 3) << 24) | |
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(ioread8(phy->iobase + addr + 2) << 16) | |
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(ioread8(phy->iobase + addr + 1) << 8) | |
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(ioread8(phy->iobase + addr)); |
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return 0; |
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} |
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static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data, |
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u32 addr, u32 value) |
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{ |
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data); |
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/* |
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* Due to the limitation of SPI controller on SynQuacer, |
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* 16/32 bits access must be done in byte-wise and descending order. |
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*/ |
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iowrite8(value >> 24, phy->iobase + addr + 3); |
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iowrite8(value >> 16, phy->iobase + addr + 2); |
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iowrite8(value >> 8, phy->iobase + addr + 1); |
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iowrite8(value, phy->iobase + addr); |
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return 0; |
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} |
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static const struct tpm_tis_phy_ops tpm_tcg_bw = { |
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.read_bytes = tpm_tis_synquacer_read_bytes, |
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.write_bytes = tpm_tis_synquacer_write_bytes, |
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.read16 = tpm_tis_synquacer_read16_bw, |
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.read32 = tpm_tis_synquacer_read32_bw, |
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.write32 = tpm_tis_synquacer_write32_bw, |
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}; |
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static int tpm_tis_synquacer_init(struct device *dev, |
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struct tpm_tis_synquacer_info *tpm_info) |
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{ |
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struct tpm_tis_synquacer_phy *phy; |
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phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL); |
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if (phy == NULL) |
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return -ENOMEM; |
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phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); |
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if (IS_ERR(phy->iobase)) |
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return PTR_ERR(phy->iobase); |
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return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw, |
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ACPI_HANDLE(dev)); |
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} |
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static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume); |
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static int tpm_tis_synquacer_probe(struct platform_device *pdev) |
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{ |
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struct tpm_tis_synquacer_info tpm_info = {}; |
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struct resource *res; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (res == NULL) { |
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dev_err(&pdev->dev, "no memory resource defined\n"); |
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return -ENODEV; |
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} |
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tpm_info.res = *res; |
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tpm_info.irq = -1; |
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return tpm_tis_synquacer_init(&pdev->dev, &tpm_info); |
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} |
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static int tpm_tis_synquacer_remove(struct platform_device *pdev) |
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{ |
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struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); |
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tpm_chip_unregister(chip); |
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tpm_tis_remove(chip); |
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return 0; |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id tis_synquacer_of_platform_match[] = { |
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{.compatible = "socionext,synquacer-tpm-mmio"}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match); |
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#endif |
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#ifdef CONFIG_ACPI |
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static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = { |
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{ "SCX0009" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl); |
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#endif |
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static struct platform_driver tis_synquacer_drv = { |
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.probe = tpm_tis_synquacer_probe, |
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.remove = tpm_tis_synquacer_remove, |
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.driver = { |
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.name = "tpm_tis_synquacer", |
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.pm = &tpm_tis_synquacer_pm, |
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.of_match_table = of_match_ptr(tis_synquacer_of_platform_match), |
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.acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl), |
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}, |
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}; |
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static int __init tpm_tis_synquacer_module_init(void) |
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{ |
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int rc; |
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rc = platform_driver_register(&tis_synquacer_drv); |
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if (rc) |
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return rc; |
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return 0; |
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} |
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static void __exit tpm_tis_synquacer_module_exit(void) |
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{ |
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platform_driver_unregister(&tis_synquacer_drv); |
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} |
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module_init(tpm_tis_synquacer_module_init); |
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module_exit(tpm_tis_synquacer_module_exit); |
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MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform"); |
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MODULE_LICENSE("GPL");
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