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![Johannes Holland](/assets/img/avatar_default.png)
Only tpm_tis and tpm_tis_synquacer have a dedicated way to access multiple bytes at once, every other driver will just fall back to read_bytes/write_bytes. Therefore, remove the read16/read32/write32 calls and move their logic to read_bytes/write_bytes. Suggested-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Johannes Holland <johannes.holland@infineon.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
186 lines
4.5 KiB
C
186 lines
4.5 KiB
C
// 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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enum tpm_tis_io_mode io_mode)
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{
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
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switch (io_mode) {
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case TPM_TIS_PHYS_8:
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while (len--)
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*result++ = ioread8(phy->iobase + addr);
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break;
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case TPM_TIS_PHYS_16:
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result[1] = ioread8(phy->iobase + addr + 1);
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result[0] = ioread8(phy->iobase + addr);
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break;
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case TPM_TIS_PHYS_32:
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result[3] = ioread8(phy->iobase + addr + 3);
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result[2] = ioread8(phy->iobase + addr + 2);
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result[1] = ioread8(phy->iobase + addr + 1);
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result[0] = ioread8(phy->iobase + addr);
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break;
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}
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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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enum tpm_tis_io_mode io_mode)
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{
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struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
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switch (io_mode) {
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case TPM_TIS_PHYS_8:
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while (len--)
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iowrite8(*value++, phy->iobase + addr);
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break;
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case TPM_TIS_PHYS_16:
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return -EINVAL;
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case TPM_TIS_PHYS_32:
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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[3], phy->iobase + addr + 3);
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iowrite8(value[2], phy->iobase + addr + 2);
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iowrite8(value[1], phy->iobase + addr + 1);
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iowrite8(value[0], phy->iobase + addr);
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break;
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}
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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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};
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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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