422 lines
10 KiB
C
422 lines
10 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "tpm.h"
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/* National definitions */
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enum tpm_nsc_addr{
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TPM_NSC_IRQ = 0x07,
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TPM_NSC_BASE0_HI = 0x60,
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TPM_NSC_BASE0_LO = 0x61,
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TPM_NSC_BASE1_HI = 0x62,
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TPM_NSC_BASE1_LO = 0x63
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};
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enum tpm_nsc_index {
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NSC_LDN_INDEX = 0x07,
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NSC_SID_INDEX = 0x20,
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NSC_LDC_INDEX = 0x30,
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NSC_DIO_INDEX = 0x60,
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NSC_CIO_INDEX = 0x62,
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NSC_IRQ_INDEX = 0x70,
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NSC_ITS_INDEX = 0x71
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};
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enum tpm_nsc_status_loc {
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NSC_STATUS = 0x01,
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NSC_COMMAND = 0x01,
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NSC_DATA = 0x00
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};
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/* status bits */
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enum tpm_nsc_status {
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NSC_STATUS_OBF = 0x01, /* output buffer full */
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NSC_STATUS_IBF = 0x02, /* input buffer full */
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NSC_STATUS_F0 = 0x04, /* F0 */
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NSC_STATUS_A2 = 0x08, /* A2 */
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NSC_STATUS_RDY = 0x10, /* ready to receive command */
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NSC_STATUS_IBR = 0x20 /* ready to receive data */
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};
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/* command bits */
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enum tpm_nsc_cmd_mode {
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NSC_COMMAND_NORMAL = 0x01, /* normal mode */
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NSC_COMMAND_EOC = 0x03,
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NSC_COMMAND_CANCEL = 0x22
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};
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struct tpm_nsc_priv {
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unsigned long base;
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};
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/*
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* Wait for a certain status to appear
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*/
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static int wait_for_stat(struct tpm_chip *chip, u8 mask, u8 val, u8 * data)
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{
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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unsigned long stop;
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/* status immediately available check */
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*data = inb(priv->base + NSC_STATUS);
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if ((*data & mask) == val)
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return 0;
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/* wait for status */
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stop = jiffies + 10 * HZ;
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do {
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msleep(TPM_TIMEOUT);
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*data = inb(priv->base + 1);
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if ((*data & mask) == val)
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return 0;
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}
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while (time_before(jiffies, stop));
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return -EBUSY;
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}
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static int nsc_wait_for_ready(struct tpm_chip *chip)
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{
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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int status;
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unsigned long stop;
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/* status immediately available check */
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status = inb(priv->base + NSC_STATUS);
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if (status & NSC_STATUS_OBF)
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status = inb(priv->base + NSC_DATA);
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if (status & NSC_STATUS_RDY)
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return 0;
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/* wait for status */
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stop = jiffies + 100;
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do {
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msleep(TPM_TIMEOUT);
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status = inb(priv->base + NSC_STATUS);
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if (status & NSC_STATUS_OBF)
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status = inb(priv->base + NSC_DATA);
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if (status & NSC_STATUS_RDY)
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return 0;
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}
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while (time_before(jiffies, stop));
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dev_info(&chip->dev, "wait for ready failed\n");
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return -EBUSY;
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}
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static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
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{
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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u8 *buffer = buf;
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u8 data, *p;
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u32 size;
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__be32 *native_size;
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if (count < 6)
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return -EIO;
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if (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0) {
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dev_err(&chip->dev, "F0 timeout\n");
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return -EIO;
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}
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data = inb(priv->base + NSC_DATA);
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if (data != NSC_COMMAND_NORMAL) {
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dev_err(&chip->dev, "not in normal mode (0x%x)\n",
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data);
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return -EIO;
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}
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/* read the whole packet */
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for (p = buffer; p < &buffer[count]; p++) {
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if (wait_for_stat
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(chip, NSC_STATUS_OBF, NSC_STATUS_OBF, &data) < 0) {
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dev_err(&chip->dev,
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"OBF timeout (while reading data)\n");
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return -EIO;
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}
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if (data & NSC_STATUS_F0)
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break;
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*p = inb(priv->base + NSC_DATA);
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}
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if ((data & NSC_STATUS_F0) == 0 &&
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(wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0)) {
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dev_err(&chip->dev, "F0 not set\n");
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return -EIO;
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}
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data = inb(priv->base + NSC_DATA);
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if (data != NSC_COMMAND_EOC) {
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dev_err(&chip->dev,
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"expected end of command(0x%x)\n", data);
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return -EIO;
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}
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native_size = (__force __be32 *) (buf + 2);
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size = be32_to_cpu(*native_size);
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if (count < size)
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return -EIO;
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return size;
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}
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static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
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{
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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u8 data;
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int i;
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/*
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* If we hit the chip with back to back commands it locks up
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* and never set IBF. Hitting it with this "hammer" seems to
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* fix it. Not sure why this is needed, we followed the flow
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* chart in the manual to the letter.
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*/
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outb(NSC_COMMAND_CANCEL, priv->base + NSC_COMMAND);
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if (nsc_wait_for_ready(chip) != 0)
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return -EIO;
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if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
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dev_err(&chip->dev, "IBF timeout\n");
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return -EIO;
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}
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outb(NSC_COMMAND_NORMAL, priv->base + NSC_COMMAND);
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if (wait_for_stat(chip, NSC_STATUS_IBR, NSC_STATUS_IBR, &data) < 0) {
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dev_err(&chip->dev, "IBR timeout\n");
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return -EIO;
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}
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for (i = 0; i < count; i++) {
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if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
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dev_err(&chip->dev,
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"IBF timeout (while writing data)\n");
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return -EIO;
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}
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outb(buf[i], priv->base + NSC_DATA);
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}
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if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
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dev_err(&chip->dev, "IBF timeout\n");
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return -EIO;
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}
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outb(NSC_COMMAND_EOC, priv->base + NSC_COMMAND);
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return count;
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}
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static void tpm_nsc_cancel(struct tpm_chip *chip)
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{
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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outb(NSC_COMMAND_CANCEL, priv->base + NSC_COMMAND);
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}
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static u8 tpm_nsc_status(struct tpm_chip *chip)
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{
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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return inb(priv->base + NSC_STATUS);
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}
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static bool tpm_nsc_req_canceled(struct tpm_chip *chip, u8 status)
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{
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return (status == NSC_STATUS_RDY);
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}
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static const struct tpm_class_ops tpm_nsc = {
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.recv = tpm_nsc_recv,
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.send = tpm_nsc_send,
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.cancel = tpm_nsc_cancel,
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.status = tpm_nsc_status,
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.req_complete_mask = NSC_STATUS_OBF,
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.req_complete_val = NSC_STATUS_OBF,
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.req_canceled = tpm_nsc_req_canceled,
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};
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static struct platform_device *pdev = NULL;
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static void tpm_nsc_remove(struct device *dev)
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{
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struct tpm_chip *chip = dev_get_drvdata(dev);
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struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
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tpm_chip_unregister(chip);
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release_region(priv->base, 2);
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}
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static SIMPLE_DEV_PM_OPS(tpm_nsc_pm, tpm_pm_suspend, tpm_pm_resume);
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static struct platform_driver nsc_drv = {
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.driver = {
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.name = "tpm_nsc",
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.pm = &tpm_nsc_pm,
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},
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};
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static inline int tpm_read_index(int base, int index)
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{
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outb(index, base);
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return inb(base+1) & 0xFF;
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}
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static inline void tpm_write_index(int base, int index, int value)
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{
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outb(index, base);
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outb(value & 0xFF, base+1);
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}
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static int __init init_nsc(void)
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{
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int rc = 0;
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int lo, hi, err;
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int nscAddrBase = TPM_ADDR;
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struct tpm_chip *chip;
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unsigned long base;
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struct tpm_nsc_priv *priv;
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/* verify that it is a National part (SID) */
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if (tpm_read_index(TPM_ADDR, NSC_SID_INDEX) != 0xEF) {
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nscAddrBase = (tpm_read_index(TPM_SUPERIO_ADDR, 0x2C)<<8)|
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(tpm_read_index(TPM_SUPERIO_ADDR, 0x2B)&0xFE);
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if (tpm_read_index(nscAddrBase, NSC_SID_INDEX) != 0xF6)
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return -ENODEV;
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}
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err = platform_driver_register(&nsc_drv);
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if (err)
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return err;
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hi = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_HI);
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lo = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_LO);
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base = (hi<<8) | lo;
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/* enable the DPM module */
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tpm_write_index(nscAddrBase, NSC_LDC_INDEX, 0x01);
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pdev = platform_device_alloc("tpm_nscl0", -1);
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if (!pdev) {
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rc = -ENOMEM;
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goto err_unreg_drv;
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}
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pdev->num_resources = 0;
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pdev->dev.driver = &nsc_drv.driver;
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pdev->dev.release = tpm_nsc_remove;
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if ((rc = platform_device_add(pdev)) < 0)
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goto err_put_dev;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv) {
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rc = -ENOMEM;
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goto err_del_dev;
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}
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priv->base = base;
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if (request_region(base, 2, "tpm_nsc0") == NULL ) {
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rc = -EBUSY;
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goto err_del_dev;
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}
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chip = tpmm_chip_alloc(&pdev->dev, &tpm_nsc);
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if (IS_ERR(chip)) {
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rc = -ENODEV;
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goto err_rel_reg;
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}
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dev_set_drvdata(&chip->dev, priv);
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rc = tpm_chip_register(chip);
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if (rc)
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goto err_rel_reg;
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dev_dbg(&pdev->dev, "NSC TPM detected\n");
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dev_dbg(&pdev->dev,
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"NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n",
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tpm_read_index(nscAddrBase,0x07), tpm_read_index(nscAddrBase,0x20),
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tpm_read_index(nscAddrBase,0x27));
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dev_dbg(&pdev->dev,
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"NSC SIOCF1 0x%x SIOCF5 0x%x SIOCF6 0x%x SIOCF8 0x%x\n",
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tpm_read_index(nscAddrBase,0x21), tpm_read_index(nscAddrBase,0x25),
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tpm_read_index(nscAddrBase,0x26), tpm_read_index(nscAddrBase,0x28));
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dev_dbg(&pdev->dev, "NSC IO Base0 0x%x\n",
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(tpm_read_index(nscAddrBase,0x60) << 8) | tpm_read_index(nscAddrBase,0x61));
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dev_dbg(&pdev->dev, "NSC IO Base1 0x%x\n",
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(tpm_read_index(nscAddrBase,0x62) << 8) | tpm_read_index(nscAddrBase,0x63));
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dev_dbg(&pdev->dev, "NSC Interrupt number and wakeup 0x%x\n",
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tpm_read_index(nscAddrBase,0x70));
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dev_dbg(&pdev->dev, "NSC IRQ type select 0x%x\n",
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tpm_read_index(nscAddrBase,0x71));
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dev_dbg(&pdev->dev,
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"NSC DMA channel select0 0x%x, select1 0x%x\n",
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tpm_read_index(nscAddrBase,0x74), tpm_read_index(nscAddrBase,0x75));
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dev_dbg(&pdev->dev,
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"NSC Config "
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"0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
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tpm_read_index(nscAddrBase,0xF0), tpm_read_index(nscAddrBase,0xF1),
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tpm_read_index(nscAddrBase,0xF2), tpm_read_index(nscAddrBase,0xF3),
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tpm_read_index(nscAddrBase,0xF4), tpm_read_index(nscAddrBase,0xF5),
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tpm_read_index(nscAddrBase,0xF6), tpm_read_index(nscAddrBase,0xF7),
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tpm_read_index(nscAddrBase,0xF8), tpm_read_index(nscAddrBase,0xF9));
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dev_info(&pdev->dev,
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"NSC TPM revision %d\n",
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tpm_read_index(nscAddrBase, 0x27) & 0x1F);
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return 0;
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err_rel_reg:
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release_region(base, 2);
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err_del_dev:
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platform_device_del(pdev);
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err_put_dev:
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platform_device_put(pdev);
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err_unreg_drv:
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platform_driver_unregister(&nsc_drv);
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return rc;
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}
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static void __exit cleanup_nsc(void)
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{
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if (pdev) {
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tpm_nsc_remove(&pdev->dev);
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platform_device_unregister(pdev);
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}
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platform_driver_unregister(&nsc_drv);
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}
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module_init(init_nsc);
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module_exit(cleanup_nsc);
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MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
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MODULE_DESCRIPTION("TPM Driver");
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MODULE_VERSION("2.0");
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MODULE_LICENSE("GPL");
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