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22#include "tpm.h"
23#include "tpm_atmel.h"
24
25
26enum tpm_atmel_write_status {
27 ATML_STATUS_ABORT = 0x01,
28 ATML_STATUS_LASTBYTE = 0x04
29};
30
31enum tpm_atmel_read_status {
32 ATML_STATUS_BUSY = 0x01,
33 ATML_STATUS_DATA_AVAIL = 0x02,
34 ATML_STATUS_REWRITE = 0x04,
35 ATML_STATUS_READY = 0x08
36};
37
38static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
39{
40 u8 status, *hdr = buf;
41 u32 size;
42 int i;
43 __be32 *native_size;
44
45
46 if (count < 6)
47 return -EIO;
48
49 for (i = 0; i < 6; i++) {
50 status = ioread8(chip->vendor.iobase + 1);
51 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
52 dev_err(chip->dev, "error reading header\n");
53 return -EIO;
54 }
55 *buf++ = ioread8(chip->vendor.iobase);
56 }
57
58
59 native_size = (__force __be32 *) (hdr + 2);
60 size = be32_to_cpu(*native_size);
61
62 if (count < size) {
63 dev_err(chip->dev,
64 "Recv size(%d) less than available space\n", size);
65 for (; i < size; i++) {
66 status = ioread8(chip->vendor.iobase + 1);
67 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
68 dev_err(chip->dev, "error reading data\n");
69 return -EIO;
70 }
71 }
72 return -EIO;
73 }
74
75
76 for (; i < size; i++) {
77 status = ioread8(chip->vendor.iobase + 1);
78 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
79 dev_err(chip->dev, "error reading data\n");
80 return -EIO;
81 }
82 *buf++ = ioread8(chip->vendor.iobase);
83 }
84
85
86 status = ioread8(chip->vendor.iobase + 1);
87
88 if (status & ATML_STATUS_DATA_AVAIL) {
89 dev_err(chip->dev, "data available is stuck\n");
90 return -EIO;
91 }
92
93 return size;
94}
95
96static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count)
97{
98 int i;
99
100 dev_dbg(chip->dev, "tpm_atml_send:\n");
101 for (i = 0; i < count; i++) {
102 dev_dbg(chip->dev, "%d 0x%x(%d)\n", i, buf[i], buf[i]);
103 iowrite8(buf[i], chip->vendor.iobase);
104 }
105
106 return count;
107}
108
109static void tpm_atml_cancel(struct tpm_chip *chip)
110{
111 iowrite8(ATML_STATUS_ABORT, chip->vendor.iobase + 1);
112}
113
114static u8 tpm_atml_status(struct tpm_chip *chip)
115{
116 return ioread8(chip->vendor.iobase + 1);
117}
118
119static bool tpm_atml_req_canceled(struct tpm_chip *chip, u8 status)
120{
121 return (status == ATML_STATUS_READY);
122}
123
124static const struct file_operations atmel_ops = {
125 .owner = THIS_MODULE,
126 .llseek = no_llseek,
127 .open = tpm_open,
128 .read = tpm_read,
129 .write = tpm_write,
130 .release = tpm_release,
131};
132
133static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
134static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
135static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
136static DEVICE_ATTR(cancel, S_IWUSR |S_IWGRP, NULL, tpm_store_cancel);
137
138static struct attribute* atmel_attrs[] = {
139 &dev_attr_pubek.attr,
140 &dev_attr_pcrs.attr,
141 &dev_attr_caps.attr,
142 &dev_attr_cancel.attr,
143 NULL,
144};
145
146static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };
147
148static const struct tpm_vendor_specific tpm_atmel = {
149 .recv = tpm_atml_recv,
150 .send = tpm_atml_send,
151 .cancel = tpm_atml_cancel,
152 .status = tpm_atml_status,
153 .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
154 .req_complete_val = ATML_STATUS_DATA_AVAIL,
155 .req_canceled = tpm_atml_req_canceled,
156 .attr_group = &atmel_attr_grp,
157 .miscdev = { .fops = &atmel_ops, },
158};
159
160static struct platform_device *pdev;
161
162static void atml_plat_remove(void)
163{
164 struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
165
166 if (chip) {
167 if (chip->vendor.have_region)
168 atmel_release_region(chip->vendor.base,
169 chip->vendor.region_size);
170 atmel_put_base_addr(chip->vendor.iobase);
171 tpm_remove_hardware(chip->dev);
172 platform_device_unregister(pdev);
173 }
174}
175
176static SIMPLE_DEV_PM_OPS(tpm_atml_pm, tpm_pm_suspend, tpm_pm_resume);
177
178static struct platform_driver atml_drv = {
179 .driver = {
180 .name = "tpm_atmel",
181 .owner = THIS_MODULE,
182 .pm = &tpm_atml_pm,
183 },
184};
185
186static int __init init_atmel(void)
187{
188 int rc = 0;
189 void __iomem *iobase = NULL;
190 int have_region, region_size;
191 unsigned long base;
192 struct tpm_chip *chip;
193
194 rc = platform_driver_register(&atml_drv);
195 if (rc)
196 return rc;
197
198 if ((iobase = atmel_get_base_addr(&base, ®ion_size)) == NULL) {
199 rc = -ENODEV;
200 goto err_unreg_drv;
201 }
202
203 have_region =
204 (atmel_request_region
205 (tpm_atmel.base, region_size, "tpm_atmel0") == NULL) ? 0 : 1;
206
207 pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0);
208 if (IS_ERR(pdev)) {
209 rc = PTR_ERR(pdev);
210 goto err_rel_reg;
211 }
212
213 if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_atmel))) {
214 rc = -ENODEV;
215 goto err_unreg_dev;
216 }
217
218 chip->vendor.iobase = iobase;
219 chip->vendor.base = base;
220 chip->vendor.have_region = have_region;
221 chip->vendor.region_size = region_size;
222
223 return 0;
224
225err_unreg_dev:
226 platform_device_unregister(pdev);
227err_rel_reg:
228 atmel_put_base_addr(iobase);
229 if (have_region)
230 atmel_release_region(base,
231 region_size);
232err_unreg_drv:
233 platform_driver_unregister(&atml_drv);
234 return rc;
235}
236
237static void __exit cleanup_atmel(void)
238{
239 platform_driver_unregister(&atml_drv);
240 atml_plat_remove();
241}
242
243module_init(init_atmel);
244module_exit(cleanup_atmel);
245
246MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
247MODULE_DESCRIPTION("TPM Driver");
248MODULE_VERSION("2.0");
249MODULE_LICENSE("GPL");
250
