| /* |
| * Copyright (C) 2013 Guntermann & Drunck, GmbH |
| * |
| * Written by Dirk Eibach <dirk.eibach@gdsys.cc> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <tpm.h> |
| #include <i2c.h> |
| #include <asm/unaligned.h> |
| |
| #include "tpm_internal.h" |
| |
| #define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but |
| generating/exporting keys */ |
| |
| /* |
| * tpm_atmel_twi_open() |
| * |
| * Requests access to locality 0 for the caller. After all commands have been |
| * completed the caller is supposed to call tis_close(). |
| * |
| * Returns 0 on success, -1 on failure. |
| */ |
| static int tpm_atmel_twi_open(struct udevice *dev) |
| { |
| return 0; |
| } |
| |
| /* |
| * tpm_atmel_twi_close() |
| * |
| * terminate the currect session with the TPM by releasing the locked |
| * locality. Returns 0 on success of -1 on failure (in case lock |
| * removal did not succeed). |
| */ |
| static int tpm_atmel_twi_close(struct udevice *dev) |
| { |
| return 0; |
| } |
| |
| /* |
| * tpm_atmel_twi_get_desc() |
| * |
| * @dev: Device to check |
| * @buf: Buffer to put the string |
| * @size: Maximum size of buffer |
| * @return length of string, or -ENOSPC it no space |
| */ |
| static int tpm_atmel_twi_get_desc(struct udevice *dev, char *buf, int size) |
| { |
| return 0; |
| } |
| |
| /* |
| * tpm_atmel_twi_xfer() |
| * |
| * Send the requested data to the TPM and then try to get its response |
| * |
| * @sendbuf - buffer of the data to send |
| * @send_size size of the data to send |
| * @recvbuf - memory to save the response to |
| * @recv_len - pointer to the size of the response buffer |
| * |
| * Returns 0 on success (and places the number of response bytes at recv_len) |
| * or -1 on failure. |
| */ |
| static int tpm_atmel_twi_xfer(struct udevice *dev, |
| const uint8_t *sendbuf, size_t send_size, |
| uint8_t *recvbuf, size_t *recv_len) |
| { |
| int res; |
| unsigned long start; |
| |
| #ifdef DEBUG |
| memset(recvbuf, 0xcc, *recv_len); |
| printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len); |
| print_buffer(0, (void *)sendbuf, 1, send_size, 0); |
| #endif |
| |
| #ifndef CONFIG_DM_I2C |
| res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size); |
| #else |
| res = dm_i2c_write(dev, 0, sendbuf, send_size); |
| #endif |
| if (res) { |
| printf("i2c_write returned %d\n", res); |
| return -1; |
| } |
| |
| start = get_timer(0); |
| #ifndef CONFIG_DM_I2C |
| while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) |
| #else |
| while ((res = dm_i2c_read(dev, 0, recvbuf, 10))) |
| #endif |
| { |
| /* TODO Use TIS_TIMEOUT from tpm_tis_infineon.h */ |
| if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) { |
| puts("tpm timed out\n"); |
| return -1; |
| } |
| udelay(100); |
| } |
| if (!res) { |
| unsigned int hdr_recv_len; |
| hdr_recv_len = get_unaligned_be32(recvbuf + 2); |
| if (hdr_recv_len < 10) { |
| puts("tpm response header too small\n"); |
| return -1; |
| } else if (hdr_recv_len > *recv_len) { |
| puts("tpm response length is bigger than receive buffer\n"); |
| return -1; |
| } else { |
| *recv_len = hdr_recv_len; |
| #ifndef CONFIG_DM_I2C |
| res = i2c_read(0x29, 0, 0, recvbuf, *recv_len); |
| #else |
| res = dm_i2c_read(dev, 0, recvbuf, *recv_len); |
| #endif |
| |
| } |
| } |
| if (res) { |
| printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len); |
| #ifdef DEBUG |
| print_buffer(0, recvbuf, 1, *recv_len, 0); |
| #endif |
| } |
| |
| #ifdef DEBUG |
| if (!res) { |
| printf("read from TPM (%d bytes):\n", *recv_len); |
| print_buffer(0, recvbuf, 1, *recv_len, 0); |
| } |
| #endif |
| |
| return res; |
| } |
| |
| static int tpm_atmel_twi_probe(struct udevice *dev) |
| { |
| return 0; |
| } |
| |
| static const struct udevice_id tpm_atmel_twi_ids[] = { |
| { .compatible = "atmel,at97sc3204t"}, |
| { } |
| }; |
| |
| static const struct tpm_ops tpm_atmel_twi_ops = { |
| .open = tpm_atmel_twi_open, |
| .close = tpm_atmel_twi_close, |
| .xfer = tpm_atmel_twi_xfer, |
| .get_desc = tpm_atmel_twi_get_desc, |
| }; |
| |
| U_BOOT_DRIVER(tpm_atmel_twi) = { |
| .name = "tpm_atmel_twi", |
| .id = UCLASS_TPM, |
| .of_match = tpm_atmel_twi_ids, |
| .ops = &tpm_atmel_twi_ops, |
| .probe = tpm_atmel_twi_probe, |
| }; |