1d5ae56a4SMasahisa Kojima // SPDX-License-Identifier: GPL-2.0
2d5ae56a4SMasahisa Kojima /*
3d5ae56a4SMasahisa Kojima * Copyright (C) 2020 Linaro Ltd.
4d5ae56a4SMasahisa Kojima *
5d5ae56a4SMasahisa Kojima * This device driver implements MMIO TPM on SynQuacer Platform.
6d5ae56a4SMasahisa Kojima */
7d5ae56a4SMasahisa Kojima #include <linux/acpi.h>
8d5ae56a4SMasahisa Kojima #include <linux/init.h>
9d5ae56a4SMasahisa Kojima #include <linux/module.h>
10d5ae56a4SMasahisa Kojima #include <linux/slab.h>
11d5ae56a4SMasahisa Kojima #include <linux/of.h>
12d5ae56a4SMasahisa Kojima #include <linux/kernel.h>
13d5ae56a4SMasahisa Kojima #include "tpm.h"
14d5ae56a4SMasahisa Kojima #include "tpm_tis_core.h"
15d5ae56a4SMasahisa Kojima
16d5ae56a4SMasahisa Kojima /*
17d5ae56a4SMasahisa Kojima * irq > 0 means: use irq $irq;
18d5ae56a4SMasahisa Kojima * irq = 0 means: autoprobe for an irq;
19d5ae56a4SMasahisa Kojima * irq = -1 means: no irq support
20d5ae56a4SMasahisa Kojima */
21d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_info {
22d5ae56a4SMasahisa Kojima struct resource res;
23d5ae56a4SMasahisa Kojima int irq;
24d5ae56a4SMasahisa Kojima };
25d5ae56a4SMasahisa Kojima
26d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_phy {
27d5ae56a4SMasahisa Kojima struct tpm_tis_data priv;
28d5ae56a4SMasahisa Kojima void __iomem *iobase;
29d5ae56a4SMasahisa Kojima };
30d5ae56a4SMasahisa Kojima
to_tpm_tis_tcg_phy(struct tpm_tis_data * data)31d5ae56a4SMasahisa Kojima static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
32d5ae56a4SMasahisa Kojima {
33d5ae56a4SMasahisa Kojima return container_of(data, struct tpm_tis_synquacer_phy, priv);
34d5ae56a4SMasahisa Kojima }
35d5ae56a4SMasahisa Kojima
tpm_tis_synquacer_read_bytes(struct tpm_tis_data * data,u32 addr,u16 len,u8 * result,enum tpm_tis_io_mode io_mode)36d5ae56a4SMasahisa Kojima static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr,
376422cbd3SJohannes Holland u16 len, u8 *result,
386422cbd3SJohannes Holland enum tpm_tis_io_mode io_mode)
39d5ae56a4SMasahisa Kojima {
40d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
416422cbd3SJohannes Holland switch (io_mode) {
426422cbd3SJohannes Holland case TPM_TIS_PHYS_8:
43d5ae56a4SMasahisa Kojima while (len--)
44d5ae56a4SMasahisa Kojima *result++ = ioread8(phy->iobase + addr);
456422cbd3SJohannes Holland break;
466422cbd3SJohannes Holland case TPM_TIS_PHYS_16:
476422cbd3SJohannes Holland result[1] = ioread8(phy->iobase + addr + 1);
486422cbd3SJohannes Holland result[0] = ioread8(phy->iobase + addr);
496422cbd3SJohannes Holland break;
506422cbd3SJohannes Holland case TPM_TIS_PHYS_32:
516422cbd3SJohannes Holland result[3] = ioread8(phy->iobase + addr + 3);
526422cbd3SJohannes Holland result[2] = ioread8(phy->iobase + addr + 2);
536422cbd3SJohannes Holland result[1] = ioread8(phy->iobase + addr + 1);
546422cbd3SJohannes Holland result[0] = ioread8(phy->iobase + addr);
556422cbd3SJohannes Holland break;
566422cbd3SJohannes Holland }
57d5ae56a4SMasahisa Kojima
58d5ae56a4SMasahisa Kojima return 0;
59d5ae56a4SMasahisa Kojima }
60d5ae56a4SMasahisa Kojima
tpm_tis_synquacer_write_bytes(struct tpm_tis_data * data,u32 addr,u16 len,const u8 * value,enum tpm_tis_io_mode io_mode)61d5ae56a4SMasahisa Kojima static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr,
626422cbd3SJohannes Holland u16 len, const u8 *value,
636422cbd3SJohannes Holland enum tpm_tis_io_mode io_mode)
64d5ae56a4SMasahisa Kojima {
65d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
666422cbd3SJohannes Holland switch (io_mode) {
676422cbd3SJohannes Holland case TPM_TIS_PHYS_8:
68d5ae56a4SMasahisa Kojima while (len--)
69d5ae56a4SMasahisa Kojima iowrite8(*value++, phy->iobase + addr);
706422cbd3SJohannes Holland break;
716422cbd3SJohannes Holland case TPM_TIS_PHYS_16:
726422cbd3SJohannes Holland return -EINVAL;
736422cbd3SJohannes Holland case TPM_TIS_PHYS_32:
74d5ae56a4SMasahisa Kojima /*
75d5ae56a4SMasahisa Kojima * Due to the limitation of SPI controller on SynQuacer,
76d5ae56a4SMasahisa Kojima * 16/32 bits access must be done in byte-wise and descending order.
77d5ae56a4SMasahisa Kojima */
786422cbd3SJohannes Holland iowrite8(value[3], phy->iobase + addr + 3);
796422cbd3SJohannes Holland iowrite8(value[2], phy->iobase + addr + 2);
806422cbd3SJohannes Holland iowrite8(value[1], phy->iobase + addr + 1);
816422cbd3SJohannes Holland iowrite8(value[0], phy->iobase + addr);
826422cbd3SJohannes Holland break;
83d5ae56a4SMasahisa Kojima }
84d5ae56a4SMasahisa Kojima
85d5ae56a4SMasahisa Kojima return 0;
86d5ae56a4SMasahisa Kojima }
87d5ae56a4SMasahisa Kojima
88d5ae56a4SMasahisa Kojima static const struct tpm_tis_phy_ops tpm_tcg_bw = {
89d5ae56a4SMasahisa Kojima .read_bytes = tpm_tis_synquacer_read_bytes,
90d5ae56a4SMasahisa Kojima .write_bytes = tpm_tis_synquacer_write_bytes,
91d5ae56a4SMasahisa Kojima };
92d5ae56a4SMasahisa Kojima
tpm_tis_synquacer_init(struct device * dev,struct tpm_tis_synquacer_info * tpm_info)93d5ae56a4SMasahisa Kojima static int tpm_tis_synquacer_init(struct device *dev,
94d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_info *tpm_info)
95d5ae56a4SMasahisa Kojima {
96d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_phy *phy;
97d5ae56a4SMasahisa Kojima
98d5ae56a4SMasahisa Kojima phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL);
99d5ae56a4SMasahisa Kojima if (phy == NULL)
100d5ae56a4SMasahisa Kojima return -ENOMEM;
101d5ae56a4SMasahisa Kojima
102d5ae56a4SMasahisa Kojima phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
103d5ae56a4SMasahisa Kojima if (IS_ERR(phy->iobase))
104d5ae56a4SMasahisa Kojima return PTR_ERR(phy->iobase);
105d5ae56a4SMasahisa Kojima
106d5ae56a4SMasahisa Kojima return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw,
107d5ae56a4SMasahisa Kojima ACPI_HANDLE(dev));
108d5ae56a4SMasahisa Kojima }
109d5ae56a4SMasahisa Kojima
110d5ae56a4SMasahisa Kojima static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume);
111d5ae56a4SMasahisa Kojima
tpm_tis_synquacer_probe(struct platform_device * pdev)112d5ae56a4SMasahisa Kojima static int tpm_tis_synquacer_probe(struct platform_device *pdev)
113d5ae56a4SMasahisa Kojima {
114d5ae56a4SMasahisa Kojima struct tpm_tis_synquacer_info tpm_info = {};
115d5ae56a4SMasahisa Kojima struct resource *res;
116d5ae56a4SMasahisa Kojima
117d5ae56a4SMasahisa Kojima res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
118d5ae56a4SMasahisa Kojima if (res == NULL) {
119d5ae56a4SMasahisa Kojima dev_err(&pdev->dev, "no memory resource defined\n");
120d5ae56a4SMasahisa Kojima return -ENODEV;
121d5ae56a4SMasahisa Kojima }
122d5ae56a4SMasahisa Kojima tpm_info.res = *res;
123d5ae56a4SMasahisa Kojima
124d5ae56a4SMasahisa Kojima tpm_info.irq = -1;
125d5ae56a4SMasahisa Kojima
126d5ae56a4SMasahisa Kojima return tpm_tis_synquacer_init(&pdev->dev, &tpm_info);
127d5ae56a4SMasahisa Kojima }
128d5ae56a4SMasahisa Kojima
tpm_tis_synquacer_remove(struct platform_device * pdev)1297b69ef62SUwe Kleine-König static void tpm_tis_synquacer_remove(struct platform_device *pdev)
130d5ae56a4SMasahisa Kojima {
131d5ae56a4SMasahisa Kojima struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
132d5ae56a4SMasahisa Kojima
133d5ae56a4SMasahisa Kojima tpm_chip_unregister(chip);
134d5ae56a4SMasahisa Kojima tpm_tis_remove(chip);
135d5ae56a4SMasahisa Kojima }
136d5ae56a4SMasahisa Kojima
137d5ae56a4SMasahisa Kojima #ifdef CONFIG_OF
138d5ae56a4SMasahisa Kojima static const struct of_device_id tis_synquacer_of_platform_match[] = {
139d5ae56a4SMasahisa Kojima {.compatible = "socionext,synquacer-tpm-mmio"},
140d5ae56a4SMasahisa Kojima {},
141d5ae56a4SMasahisa Kojima };
142d5ae56a4SMasahisa Kojima MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match);
143d5ae56a4SMasahisa Kojima #endif
144d5ae56a4SMasahisa Kojima
145d5ae56a4SMasahisa Kojima #ifdef CONFIG_ACPI
146d5ae56a4SMasahisa Kojima static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = {
147d5ae56a4SMasahisa Kojima { "SCX0009" },
148d5ae56a4SMasahisa Kojima {},
149d5ae56a4SMasahisa Kojima };
150d5ae56a4SMasahisa Kojima MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl);
151d5ae56a4SMasahisa Kojima #endif
152d5ae56a4SMasahisa Kojima
153d5ae56a4SMasahisa Kojima static struct platform_driver tis_synquacer_drv = {
154d5ae56a4SMasahisa Kojima .probe = tpm_tis_synquacer_probe,
1557b69ef62SUwe Kleine-König .remove_new = tpm_tis_synquacer_remove,
156d5ae56a4SMasahisa Kojima .driver = {
157d5ae56a4SMasahisa Kojima .name = "tpm_tis_synquacer",
158d5ae56a4SMasahisa Kojima .pm = &tpm_tis_synquacer_pm,
159d5ae56a4SMasahisa Kojima .of_match_table = of_match_ptr(tis_synquacer_of_platform_match),
160d5ae56a4SMasahisa Kojima .acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl),
161d5ae56a4SMasahisa Kojima },
162d5ae56a4SMasahisa Kojima };
163d5ae56a4SMasahisa Kojima
164*2ccf8c76SLi Zetao module_platform_driver(tis_synquacer_drv);
165d5ae56a4SMasahisa Kojima
166d5ae56a4SMasahisa Kojima MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform");
167d5ae56a4SMasahisa Kojima MODULE_LICENSE("GPL");
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