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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Linaro Ltd.
*
* This device driver implements MMIO TPM on SynQuacer Platform.
*/
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/kernel.h>
#include "tpm.h"
#include "tpm_tis_core.h"
/*
* irq > 0 means: use irq $irq;
* irq = 0 means: autoprobe for an irq;
* irq = -1 means: no irq support
*/
struct tpm_tis_synquacer_info {
struct resource res;
int irq;
};
struct tpm_tis_synquacer_phy {
struct tpm_tis_data priv;
void __iomem *iobase;
};
static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
{
return container_of(data, struct tpm_tis_synquacer_phy, priv);
}
static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr,
u16 len, u8 *result,
enum tpm_tis_io_mode io_mode)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
switch (io_mode) {
case TPM_TIS_PHYS_8:
while (len--)
*result++ = ioread8(phy->iobase + addr);
break;
case TPM_TIS_PHYS_16:
result[1] = ioread8(phy->iobase + addr + 1);
result[0] = ioread8(phy->iobase + addr);
break;
case TPM_TIS_PHYS_32:
result[3] = ioread8(phy->iobase + addr + 3);
result[2] = ioread8(phy->iobase + addr + 2);
result[1] = ioread8(phy->iobase + addr + 1);
result[0] = ioread8(phy->iobase + addr);
break;
}
return 0;
}
static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr,
u16 len, const u8 *value,
enum tpm_tis_io_mode io_mode)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
switch (io_mode) {
case TPM_TIS_PHYS_8:
while (len--)
iowrite8(*value++, phy->iobase + addr);
break;
case TPM_TIS_PHYS_16:
return -EINVAL;
case TPM_TIS_PHYS_32:
/*
* Due to the limitation of SPI controller on SynQuacer,
* 16/32 bits access must be done in byte-wise and descending order.
*/
iowrite8(value[3], phy->iobase + addr + 3);
iowrite8(value[2], phy->iobase + addr + 2);
iowrite8(value[1], phy->iobase + addr + 1);
iowrite8(value[0], phy->iobase + addr);
break;
}
return 0;
}
static const struct tpm_tis_phy_ops tpm_tcg_bw = {
.read_bytes = tpm_tis_synquacer_read_bytes,
.write_bytes = tpm_tis_synquacer_write_bytes,
};
static int tpm_tis_synquacer_init(struct device *dev,
struct tpm_tis_synquacer_info *tpm_info)
{
struct tpm_tis_synquacer_phy *phy;
phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL);
if (phy == NULL)
return -ENOMEM;
phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
if (IS_ERR(phy->iobase))
return PTR_ERR(phy->iobase);
return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw,
ACPI_HANDLE(dev));
}
static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume);
static int tpm_tis_synquacer_probe(struct platform_device *pdev)
{
struct tpm_tis_synquacer_info tpm_info = {};
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
return -ENODEV;
}
tpm_info.res = *res;
tpm_info.irq = -1;
return tpm_tis_synquacer_init(&pdev->dev, &tpm_info);
}
static void tpm_tis_synquacer_remove(struct platform_device *pdev)
{
struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
}
#ifdef CONFIG_OF
static const struct of_device_id tis_synquacer_of_platform_match[] = {
{.compatible = "socionext,synquacer-tpm-mmio"},
{},
};
MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = {
{ "SCX0009" },
{},
};
MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl);
#endif
static struct platform_driver tis_synquacer_drv = {
.probe = tpm_tis_synquacer_probe,
.remove_new = tpm_tis_synquacer_remove,
.driver = {
.name = "tpm_tis_synquacer",
.pm = &tpm_tis_synquacer_pm,
.of_match_table = of_match_ptr(tis_synquacer_of_platform_match),
.acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl),
},
};
module_platform_driver(tis_synquacer_drv);
MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform");
MODULE_LICENSE("GPL");
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