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235 lines
5.2 KiB
235 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Dave Safford <[email protected]> |
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* Reiner Sailer <[email protected]> |
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* Kylene Hall <[email protected]> |
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* |
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* Maintained by: <[email protected]> |
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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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#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 0; |
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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 ([email protected])"); |
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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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