tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 Linaro Ltd.
4 *
5 * This device driver implements MMIO TPM on SynQuacer Platform.
6 */
7#include <linux/acpi.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/slab.h>
11#include <linux/of.h>
12#include <linux/of_device.h>
13#include <linux/kernel.h>
14#include "tpm.h"
15#include "tpm_tis_core.h"
16
17/*
18 * irq > 0 means: use irq $irq;
19 * irq = 0 means: autoprobe for an irq;
20 * irq = -1 means: no irq support
21 */
22struct tpm_tis_synquacer_info {
23 struct resource res;
24 int irq;
25};
26
27struct tpm_tis_synquacer_phy {
28 struct tpm_tis_data priv;
29 void __iomem *iobase;
30};
31
32static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
33{
34 return container_of(data, struct tpm_tis_synquacer_phy, priv);
35}
36
37static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr,
38 u16 len, u8 *result)
39{
40 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
41
42 while (len--)
43 *result++ = ioread8(phy->iobase + addr);
44
45 return 0;
46}
47
48static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr,
49 u16 len, const u8 *value)
50{
51 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
52
53 while (len--)
54 iowrite8(*value++, phy->iobase + addr);
55
56 return 0;
57}
58
59static int tpm_tis_synquacer_read16_bw(struct tpm_tis_data *data,
60 u32 addr, u16 *result)
61{
62 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
63
64 /*
65 * Due to the limitation of SPI controller on SynQuacer,
66 * 16/32 bits access must be done in byte-wise and descending order.
67 */
68 *result = (ioread8(phy->iobase + addr + 1) << 8) |
69 (ioread8(phy->iobase + addr));
70
71 return 0;
72}
73
74static int tpm_tis_synquacer_read32_bw(struct tpm_tis_data *data,
75 u32 addr, u32 *result)
76{
77 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
78
79 /*
80 * Due to the limitation of SPI controller on SynQuacer,
81 * 16/32 bits access must be done in byte-wise and descending order.
82 */
83 *result = (ioread8(phy->iobase + addr + 3) << 24) |
84 (ioread8(phy->iobase + addr + 2) << 16) |
85 (ioread8(phy->iobase + addr + 1) << 8) |
86 (ioread8(phy->iobase + addr));
87
88 return 0;
89}
90
91static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data,
92 u32 addr, u32 value)
93{
94 struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
95
96 /*
97 * Due to the limitation of SPI controller on SynQuacer,
98 * 16/32 bits access must be done in byte-wise and descending order.
99 */
100 iowrite8(value >> 24, phy->iobase + addr + 3);
101 iowrite8(value >> 16, phy->iobase + addr + 2);
102 iowrite8(value >> 8, phy->iobase + addr + 1);
103 iowrite8(value, phy->iobase + addr);
104
105 return 0;
106}
107
108static const struct tpm_tis_phy_ops tpm_tcg_bw = {
109 .read_bytes = tpm_tis_synquacer_read_bytes,
110 .write_bytes = tpm_tis_synquacer_write_bytes,
111 .read16 = tpm_tis_synquacer_read16_bw,
112 .read32 = tpm_tis_synquacer_read32_bw,
113 .write32 = tpm_tis_synquacer_write32_bw,
114};
115
116static int tpm_tis_synquacer_init(struct device *dev,
117 struct tpm_tis_synquacer_info *tpm_info)
118{
119 struct tpm_tis_synquacer_phy *phy;
120
121 phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL);
122 if (phy == NULL)
123 return -ENOMEM;
124
125 phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
126 if (IS_ERR(phy->iobase))
127 return PTR_ERR(phy->iobase);
128
129 return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw,
130 ACPI_HANDLE(dev));
131}
132
133static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume);
134
135static int tpm_tis_synquacer_probe(struct platform_device *pdev)
136{
137 struct tpm_tis_synquacer_info tpm_info = {};
138 struct resource *res;
139
140 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
141 if (res == NULL) {
142 dev_err(&pdev->dev, "no memory resource defined\n");
143 return -ENODEV;
144 }
145 tpm_info.res = *res;
146
147 tpm_info.irq = -1;
148
149 return tpm_tis_synquacer_init(&pdev->dev, &tpm_info);
150}
151
152static int tpm_tis_synquacer_remove(struct platform_device *pdev)
153{
154 struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
155
156 tpm_chip_unregister(chip);
157 tpm_tis_remove(chip);
158
159 return 0;
160}
161
162#ifdef CONFIG_OF
163static const struct of_device_id tis_synquacer_of_platform_match[] = {
164 {.compatible = "socionext,synquacer-tpm-mmio"},
165 {},
166};
167MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match);
168#endif
169
170#ifdef CONFIG_ACPI
171static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = {
172 { "SCX0009" },
173 {},
174};
175MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl);
176#endif
177
178static struct platform_driver tis_synquacer_drv = {
179 .probe = tpm_tis_synquacer_probe,
180 .remove = tpm_tis_synquacer_remove,
181 .driver = {
182 .name = "tpm_tis_synquacer",
183 .pm = &tpm_tis_synquacer_pm,
184 .of_match_table = of_match_ptr(tis_synquacer_of_platform_match),
185 .acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl),
186 },
187};
188
189static int __init tpm_tis_synquacer_module_init(void)
190{
191 int rc;
192
193 rc = platform_driver_register(&tis_synquacer_drv);
194 if (rc)
195 return rc;
196
197 return 0;
198}
199
200static void __exit tpm_tis_synquacer_module_exit(void)
201{
202 platform_driver_unregister(&tis_synquacer_drv);
203}
204
205module_init(tpm_tis_synquacer_module_init);
206module_exit(tpm_tis_synquacer_module_exit);
207MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform");
208MODULE_LICENSE("GPL");