![Gustavo A. R. Silva](/assets/img/avatar_default.png)
Remove unnecessary NULL check. Pointer _chip_ cannot be NULL in this instance. Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com> Tested-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com> (compilation) Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
241 lines
5.4 KiB
C
241 lines
5.4 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 "tpm.h"
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#include "tpm_atmel.h"
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/* write status bits */
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enum tpm_atmel_write_status {
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ATML_STATUS_ABORT = 0x01,
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ATML_STATUS_LASTBYTE = 0x04
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};
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/* read status bits */
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enum tpm_atmel_read_status {
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ATML_STATUS_BUSY = 0x01,
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ATML_STATUS_DATA_AVAIL = 0x02,
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ATML_STATUS_REWRITE = 0x04,
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ATML_STATUS_READY = 0x08
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};
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static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct tpm_atmel_priv *priv = dev_get_drvdata(&chip->dev);
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u8 status, *hdr = buf;
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u32 size;
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int i;
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__be32 *native_size;
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/* start reading header */
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if (count < 6)
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return -EIO;
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for (i = 0; i < 6; i++) {
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status = ioread8(priv->iobase + 1);
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if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
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dev_err(&chip->dev, "error reading header\n");
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return -EIO;
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}
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*buf++ = ioread8(priv->iobase);
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}
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/* size of the data received */
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native_size = (__force __be32 *) (hdr + 2);
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size = be32_to_cpu(*native_size);
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if (count < size) {
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dev_err(&chip->dev,
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"Recv size(%d) less than available space\n", size);
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for (; i < size; i++) { /* clear the waiting data anyway */
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status = ioread8(priv->iobase + 1);
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if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
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dev_err(&chip->dev, "error reading data\n");
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return -EIO;
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}
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}
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return -EIO;
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}
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/* read all the data available */
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for (; i < size; i++) {
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status = ioread8(priv->iobase + 1);
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if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
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dev_err(&chip->dev, "error reading data\n");
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return -EIO;
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}
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*buf++ = ioread8(priv->iobase);
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}
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/* make sure data available is gone */
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status = ioread8(priv->iobase + 1);
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if (status & ATML_STATUS_DATA_AVAIL) {
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dev_err(&chip->dev, "data available is stuck\n");
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return -EIO;
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}
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return size;
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}
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static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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struct tpm_atmel_priv *priv = dev_get_drvdata(&chip->dev);
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int i;
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dev_dbg(&chip->dev, "tpm_atml_send:\n");
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for (i = 0; i < count; i++) {
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dev_dbg(&chip->dev, "%d 0x%x(%d)\n", i, buf[i], buf[i]);
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iowrite8(buf[i], priv->iobase);
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}
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return count;
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}
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static void tpm_atml_cancel(struct tpm_chip *chip)
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{
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struct tpm_atmel_priv *priv = dev_get_drvdata(&chip->dev);
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iowrite8(ATML_STATUS_ABORT, priv->iobase + 1);
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}
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static u8 tpm_atml_status(struct tpm_chip *chip)
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{
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struct tpm_atmel_priv *priv = dev_get_drvdata(&chip->dev);
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return ioread8(priv->iobase + 1);
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}
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static bool tpm_atml_req_canceled(struct tpm_chip *chip, u8 status)
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{
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return (status == ATML_STATUS_READY);
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}
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static const struct tpm_class_ops tpm_atmel = {
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.recv = tpm_atml_recv,
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.send = tpm_atml_send,
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.cancel = tpm_atml_cancel,
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.status = tpm_atml_status,
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.req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
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.req_complete_val = ATML_STATUS_DATA_AVAIL,
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.req_canceled = tpm_atml_req_canceled,
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};
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static struct platform_device *pdev;
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static void atml_plat_remove(void)
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{
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struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
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struct tpm_atmel_priv *priv = dev_get_drvdata(&chip->dev);
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tpm_chip_unregister(chip);
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if (priv->have_region)
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atmel_release_region(priv->base, priv->region_size);
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atmel_put_base_addr(priv->iobase);
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platform_device_unregister(pdev);
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}
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static SIMPLE_DEV_PM_OPS(tpm_atml_pm, tpm_pm_suspend, tpm_pm_resume);
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static struct platform_driver atml_drv = {
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.driver = {
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.name = "tpm_atmel",
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.pm = &tpm_atml_pm,
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},
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};
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static int __init init_atmel(void)
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{
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int rc = 0;
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void __iomem *iobase = NULL;
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int have_region, region_size;
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unsigned long base;
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struct tpm_chip *chip;
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struct tpm_atmel_priv *priv;
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rc = platform_driver_register(&atml_drv);
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if (rc)
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return rc;
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if ((iobase = atmel_get_base_addr(&base, ®ion_size)) == NULL) {
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rc = -ENODEV;
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goto err_unreg_drv;
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}
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have_region =
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(atmel_request_region
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(base, region_size, "tpm_atmel0") == NULL) ? 0 : 1;
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pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0);
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if (IS_ERR(pdev)) {
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rc = PTR_ERR(pdev);
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goto err_rel_reg;
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}
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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_unreg_dev;
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}
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priv->iobase = iobase;
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priv->base = base;
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priv->have_region = have_region;
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priv->region_size = region_size;
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chip = tpmm_chip_alloc(&pdev->dev, &tpm_atmel);
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if (IS_ERR(chip)) {
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rc = PTR_ERR(chip);
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goto err_unreg_dev;
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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_unreg_dev;
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return 0;
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err_unreg_dev:
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platform_device_unregister(pdev);
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err_rel_reg:
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atmel_put_base_addr(iobase);
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if (have_region)
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atmel_release_region(base,
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region_size);
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err_unreg_drv:
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platform_driver_unregister(&atml_drv);
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return rc;
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}
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static void __exit cleanup_atmel(void)
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{
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platform_driver_unregister(&atml_drv);
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atml_plat_remove();
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}
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module_init(init_atmel);
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module_exit(cleanup_atmel);
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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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