diff options
Diffstat (limited to 'drivers/char/tpm/tpm_nsc.c')
| -rw-r--r-- | drivers/char/tpm/tpm_nsc.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c new file mode 100644 index 000000000..038701d48 --- /dev/null +++ b/drivers/char/tpm/tpm_nsc.c @@ -0,0 +1,416 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2004 IBM Corporation + * + * Authors: + * Leendert van Doorn <leendert@watson.ibm.com> + * Dave Safford <safford@watson.ibm.com> + * Reiner Sailer <sailer@watson.ibm.com> + * Kylene Hall <kjhall@us.ibm.com> + * + * Maintained by: <tpmdd-devel@lists.sourceforge.net> + * + * Device driver for TCG/TCPA TPM (trusted platform module). + * Specifications at www.trustedcomputinggroup.org + */ + +#include <linux/platform_device.h> +#include <linux/slab.h> +#include "tpm.h" + +/* National definitions */ +enum tpm_nsc_addr{ + TPM_NSC_IRQ = 0x07, + TPM_NSC_BASE0_HI = 0x60, + TPM_NSC_BASE0_LO = 0x61, + TPM_NSC_BASE1_HI = 0x62, + TPM_NSC_BASE1_LO = 0x63 +}; + +enum tpm_nsc_index { + NSC_LDN_INDEX = 0x07, + NSC_SID_INDEX = 0x20, + NSC_LDC_INDEX = 0x30, + NSC_DIO_INDEX = 0x60, + NSC_CIO_INDEX = 0x62, + NSC_IRQ_INDEX = 0x70, + NSC_ITS_INDEX = 0x71 +}; + +enum tpm_nsc_status_loc { + NSC_STATUS = 0x01, + NSC_COMMAND = 0x01, + NSC_DATA = 0x00 +}; + +/* status bits */ +enum tpm_nsc_status { + NSC_STATUS_OBF = 0x01, /* output buffer full */ + NSC_STATUS_IBF = 0x02, /* input buffer full */ + NSC_STATUS_F0 = 0x04, /* F0 */ + NSC_STATUS_A2 = 0x08, /* A2 */ + NSC_STATUS_RDY = 0x10, /* ready to receive command */ + NSC_STATUS_IBR = 0x20 /* ready to receive data */ +}; + +/* command bits */ +enum tpm_nsc_cmd_mode { + NSC_COMMAND_NORMAL = 0x01, /* normal mode */ + NSC_COMMAND_EOC = 0x03, + NSC_COMMAND_CANCEL = 0x22 +}; + +struct tpm_nsc_priv { + unsigned long base; +}; + +/* + * Wait for a certain status to appear + */ +static int wait_for_stat(struct tpm_chip *chip, u8 mask, u8 val, u8 * data) +{ + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + unsigned long stop; + + /* status immediately available check */ + *data = inb(priv->base + NSC_STATUS); + if ((*data & mask) == val) + return 0; + + /* wait for status */ + stop = jiffies + 10 * HZ; + do { + msleep(TPM_TIMEOUT); + *data = inb(priv->base + 1); + if ((*data & mask) == val) + return 0; + } + while (time_before(jiffies, stop)); + + return -EBUSY; +} + +static int nsc_wait_for_ready(struct tpm_chip *chip) +{ + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + int status; + unsigned long stop; + + /* status immediately available check */ + status = inb(priv->base + NSC_STATUS); + if (status & NSC_STATUS_OBF) + status = inb(priv->base + NSC_DATA); + if (status & NSC_STATUS_RDY) + return 0; + + /* wait for status */ + stop = jiffies + 100; + do { + msleep(TPM_TIMEOUT); + status = inb(priv->base + NSC_STATUS); + if (status & NSC_STATUS_OBF) + status = inb(priv->base + NSC_DATA); + if (status & NSC_STATUS_RDY) + return 0; + } + while (time_before(jiffies, stop)); + + dev_info(&chip->dev, "wait for ready failed\n"); + return -EBUSY; +} + + +static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count) +{ + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + u8 *buffer = buf; + u8 data, *p; + u32 size; + __be32 *native_size; + + if (count < 6) + return -EIO; + + if (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0) { + dev_err(&chip->dev, "F0 timeout\n"); + return -EIO; + } + + data = inb(priv->base + NSC_DATA); + if (data != NSC_COMMAND_NORMAL) { + dev_err(&chip->dev, "not in normal mode (0x%x)\n", + data); + return -EIO; + } + + /* read the whole packet */ + for (p = buffer; p < &buffer[count]; p++) { + if (wait_for_stat + (chip, NSC_STATUS_OBF, NSC_STATUS_OBF, &data) < 0) { + dev_err(&chip->dev, + "OBF timeout (while reading data)\n"); + return -EIO; + } + if (data & NSC_STATUS_F0) + break; + *p = inb(priv->base + NSC_DATA); + } + + if ((data & NSC_STATUS_F0) == 0 && + (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0)) { + dev_err(&chip->dev, "F0 not set\n"); + return -EIO; + } + + data = inb(priv->base + NSC_DATA); + if (data != NSC_COMMAND_EOC) { + dev_err(&chip->dev, + "expected end of command(0x%x)\n", data); + return -EIO; + } + + native_size = (__force __be32 *) (buf + 2); + size = be32_to_cpu(*native_size); + + if (count < size) + return -EIO; + + return size; +} + +static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count) +{ + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + u8 data; + int i; + + /* + * If we hit the chip with back to back commands it locks up + * and never set IBF. Hitting it with this "hammer" seems to + * fix it. Not sure why this is needed, we followed the flow + * chart in the manual to the letter. + */ + outb(NSC_COMMAND_CANCEL, priv->base + NSC_COMMAND); + + if (nsc_wait_for_ready(chip) != 0) + return -EIO; + + if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) { + dev_err(&chip->dev, "IBF timeout\n"); + return -EIO; + } + + outb(NSC_COMMAND_NORMAL, priv->base + NSC_COMMAND); + if (wait_for_stat(chip, NSC_STATUS_IBR, NSC_STATUS_IBR, &data) < 0) { + dev_err(&chip->dev, "IBR timeout\n"); + return -EIO; + } + + for (i = 0; i < count; i++) { + if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) { + dev_err(&chip->dev, + "IBF timeout (while writing data)\n"); + return -EIO; + } + outb(buf[i], priv->base + NSC_DATA); + } + + if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) { + dev_err(&chip->dev, "IBF timeout\n"); + return -EIO; + } + outb(NSC_COMMAND_EOC, priv->base + NSC_COMMAND); + + return 0; +} + +static void tpm_nsc_cancel(struct tpm_chip *chip) +{ + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + + outb(NSC_COMMAND_CANCEL, priv->base + NSC_COMMAND); +} + +static u8 tpm_nsc_status(struct tpm_chip *chip) +{ + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + + return inb(priv->base + NSC_STATUS); +} + +static bool tpm_nsc_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == NSC_STATUS_RDY); +} + +static const struct tpm_class_ops tpm_nsc = { + .recv = tpm_nsc_recv, + .send = tpm_nsc_send, + .cancel = tpm_nsc_cancel, + .status = tpm_nsc_status, + .req_complete_mask = NSC_STATUS_OBF, + .req_complete_val = NSC_STATUS_OBF, + .req_canceled = tpm_nsc_req_canceled, +}; + +static struct platform_device *pdev = NULL; + +static void tpm_nsc_remove(struct device *dev) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev); + + tpm_chip_unregister(chip); + release_region(priv->base, 2); +} + +static SIMPLE_DEV_PM_OPS(tpm_nsc_pm, tpm_pm_suspend, tpm_pm_resume); + +static struct platform_driver nsc_drv = { + .driver = { + .name = "tpm_nsc", + .pm = &tpm_nsc_pm, + }, +}; + +static inline int tpm_read_index(int base, int index) +{ + outb(index, base); + return inb(base+1) & 0xFF; +} + +static inline void tpm_write_index(int base, int index, int value) +{ + outb(index, base); + outb(value & 0xFF, base+1); +} + +static int __init init_nsc(void) +{ + int rc = 0; + int lo, hi, err; + int nscAddrBase = TPM_ADDR; + struct tpm_chip *chip; + unsigned long base; + struct tpm_nsc_priv *priv; + + /* verify that it is a National part (SID) */ + if (tpm_read_index(TPM_ADDR, NSC_SID_INDEX) != 0xEF) { + nscAddrBase = (tpm_read_index(TPM_SUPERIO_ADDR, 0x2C)<<8)| + (tpm_read_index(TPM_SUPERIO_ADDR, 0x2B)&0xFE); + if (tpm_read_index(nscAddrBase, NSC_SID_INDEX) != 0xF6) + return -ENODEV; + } + + err = platform_driver_register(&nsc_drv); + if (err) + return err; + + hi = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_HI); + lo = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_LO); + base = (hi<<8) | lo; + + /* enable the DPM module */ + tpm_write_index(nscAddrBase, NSC_LDC_INDEX, 0x01); + + pdev = platform_device_alloc("tpm_nscl0", -1); + if (!pdev) { + rc = -ENOMEM; + goto err_unreg_drv; + } + + pdev->num_resources = 0; + pdev->dev.driver = &nsc_drv.driver; + pdev->dev.release = tpm_nsc_remove; + + if ((rc = platform_device_add(pdev)) < 0) + goto err_put_dev; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) { + rc = -ENOMEM; + goto err_del_dev; + } + + priv->base = base; + + if (request_region(base, 2, "tpm_nsc0") == NULL ) { + rc = -EBUSY; + goto err_del_dev; + } + + chip = tpmm_chip_alloc(&pdev->dev, &tpm_nsc); + if (IS_ERR(chip)) { + rc = -ENODEV; + goto err_rel_reg; + } + + dev_set_drvdata(&chip->dev, priv); + + rc = tpm_chip_register(chip); + if (rc) + goto err_rel_reg; + + dev_dbg(&pdev->dev, "NSC TPM detected\n"); + dev_dbg(&pdev->dev, + "NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n", + tpm_read_index(nscAddrBase,0x07), tpm_read_index(nscAddrBase,0x20), + tpm_read_index(nscAddrBase,0x27)); + dev_dbg(&pdev->dev, + "NSC SIOCF1 0x%x SIOCF5 0x%x SIOCF6 0x%x SIOCF8 0x%x\n", + tpm_read_index(nscAddrBase,0x21), tpm_read_index(nscAddrBase,0x25), + tpm_read_index(nscAddrBase,0x26), tpm_read_index(nscAddrBase,0x28)); + dev_dbg(&pdev->dev, "NSC IO Base0 0x%x\n", + (tpm_read_index(nscAddrBase,0x60) << 8) | tpm_read_index(nscAddrBase,0x61)); + dev_dbg(&pdev->dev, "NSC IO Base1 0x%x\n", + (tpm_read_index(nscAddrBase,0x62) << 8) | tpm_read_index(nscAddrBase,0x63)); + dev_dbg(&pdev->dev, "NSC Interrupt number and wakeup 0x%x\n", + tpm_read_index(nscAddrBase,0x70)); + dev_dbg(&pdev->dev, "NSC IRQ type select 0x%x\n", + tpm_read_index(nscAddrBase,0x71)); + dev_dbg(&pdev->dev, + "NSC DMA channel select0 0x%x, select1 0x%x\n", + tpm_read_index(nscAddrBase,0x74), tpm_read_index(nscAddrBase,0x75)); + dev_dbg(&pdev->dev, + "NSC Config " + "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n", + tpm_read_index(nscAddrBase,0xF0), tpm_read_index(nscAddrBase,0xF1), + tpm_read_index(nscAddrBase,0xF2), tpm_read_index(nscAddrBase,0xF3), + tpm_read_index(nscAddrBase,0xF4), tpm_read_index(nscAddrBase,0xF5), + tpm_read_index(nscAddrBase,0xF6), tpm_read_index(nscAddrBase,0xF7), + tpm_read_index(nscAddrBase,0xF8), tpm_read_index(nscAddrBase,0xF9)); + + dev_info(&pdev->dev, + "NSC TPM revision %d\n", + tpm_read_index(nscAddrBase, 0x27) & 0x1F); + + return 0; + +err_rel_reg: + release_region(base, 2); +err_del_dev: + platform_device_del(pdev); +err_put_dev: + platform_device_put(pdev); +err_unreg_drv: + platform_driver_unregister(&nsc_drv); + return rc; +} + +static void __exit cleanup_nsc(void) +{ + if (pdev) { + tpm_nsc_remove(&pdev->dev); + platform_device_unregister(pdev); + } + + platform_driver_unregister(&nsc_drv); +} + +module_init(init_nsc); +module_exit(cleanup_nsc); + +MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); +MODULE_DESCRIPTION("TPM Driver"); +MODULE_VERSION("2.0"); +MODULE_LICENSE("GPL"); |