diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/tpm/tpm_tis_lpc.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/tpm/tpm_tis_lpc.c | 479 |
1 files changed, 0 insertions, 479 deletions
diff --git a/qemu/roms/u-boot/drivers/tpm/tpm_tis_lpc.c b/qemu/roms/u-boot/drivers/tpm/tpm_tis_lpc.c deleted file mode 100644 index eecf18cbf..000000000 --- a/qemu/roms/u-boot/drivers/tpm/tpm_tis_lpc.c +++ /dev/null @@ -1,479 +0,0 @@ -/* - * Copyright (c) 2011 The Chromium OS Authors. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* - * The code in this file is based on the article "Writing a TPM Device Driver" - * published on http://ptgmedia.pearsoncmg.com. - * - * One principal difference is that in the simplest config the other than 0 - * TPM localities do not get mapped by some devices (for instance, by Infineon - * slb9635), so this driver provides access to locality 0 only. - */ - -#include <common.h> -#include <asm/io.h> -#include <tpm.h> - -#define PREFIX "lpc_tpm: " - -struct tpm_locality { - u32 access; - u8 padding0[4]; - u32 int_enable; - u8 vector; - u8 padding1[3]; - u32 int_status; - u32 int_capability; - u32 tpm_status; - u8 padding2[8]; - u8 data; - u8 padding3[3803]; - u32 did_vid; - u8 rid; - u8 padding4[251]; -}; - -/* - * This pointer refers to the TPM chip, 5 of its localities are mapped as an - * array. - */ -#define TPM_TOTAL_LOCALITIES 5 -static struct tpm_locality *lpc_tpm_dev = - (struct tpm_locality *)CONFIG_TPM_TIS_BASE_ADDRESS; - -/* Some registers' bit field definitions */ -#define TIS_STS_VALID (1 << 7) /* 0x80 */ -#define TIS_STS_COMMAND_READY (1 << 6) /* 0x40 */ -#define TIS_STS_TPM_GO (1 << 5) /* 0x20 */ -#define TIS_STS_DATA_AVAILABLE (1 << 4) /* 0x10 */ -#define TIS_STS_EXPECT (1 << 3) /* 0x08 */ -#define TIS_STS_RESPONSE_RETRY (1 << 1) /* 0x02 */ - -#define TIS_ACCESS_TPM_REG_VALID_STS (1 << 7) /* 0x80 */ -#define TIS_ACCESS_ACTIVE_LOCALITY (1 << 5) /* 0x20 */ -#define TIS_ACCESS_BEEN_SEIZED (1 << 4) /* 0x10 */ -#define TIS_ACCESS_SEIZE (1 << 3) /* 0x08 */ -#define TIS_ACCESS_PENDING_REQUEST (1 << 2) /* 0x04 */ -#define TIS_ACCESS_REQUEST_USE (1 << 1) /* 0x02 */ -#define TIS_ACCESS_TPM_ESTABLISHMENT (1 << 0) /* 0x01 */ - -#define TIS_STS_BURST_COUNT_MASK (0xffff) -#define TIS_STS_BURST_COUNT_SHIFT (8) - -/* - * Error value returned if a tpm register does not enter the expected state - * after continuous polling. No actual TPM register reading ever returns -1, - * so this value is a safe error indication to be mixed with possible status - * register values. - */ -#define TPM_TIMEOUT_ERR (-1) - -/* Error value returned on various TPM driver errors. */ -#define TPM_DRIVER_ERR (1) - - /* 1 second is plenty for anything TPM does. */ -#define MAX_DELAY_US (1000 * 1000) - -/* Retrieve burst count value out of the status register contents. */ -static u16 burst_count(u32 status) -{ - return (status >> TIS_STS_BURST_COUNT_SHIFT) & TIS_STS_BURST_COUNT_MASK; -} - -/* - * Structures defined below allow creating descriptions of TPM vendor/device - * ID information for run time discovery. The only device the system knows - * about at this time is Infineon slb9635. - */ -struct device_name { - u16 dev_id; - const char * const dev_name; -}; - -struct vendor_name { - u16 vendor_id; - const char *vendor_name; - const struct device_name *dev_names; -}; - -static const struct device_name infineon_devices[] = { - {0xb, "SLB9635 TT 1.2"}, - {0} -}; - -static const struct vendor_name vendor_names[] = { - {0x15d1, "Infineon", infineon_devices}, -}; - -/* - * Cached vendor/device ID pair to indicate that the device has been already - * discovered. - */ -static u32 vendor_dev_id; - -/* TPM access wrappers to support tracing */ -static u8 tpm_read_byte(const u8 *ptr) -{ - u8 ret = readb(ptr); - debug(PREFIX "Read reg 0x%4.4x returns 0x%2.2x\n", - (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, ret); - return ret; -} - -static u32 tpm_read_word(const u32 *ptr) -{ - u32 ret = readl(ptr); - debug(PREFIX "Read reg 0x%4.4x returns 0x%8.8x\n", - (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, ret); - return ret; -} - -static void tpm_write_byte(u8 value, u8 *ptr) -{ - debug(PREFIX "Write reg 0x%4.4x with 0x%2.2x\n", - (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, value); - writeb(value, ptr); -} - -static void tpm_write_word(u32 value, u32 *ptr) -{ - debug(PREFIX "Write reg 0x%4.4x with 0x%8.8x\n", - (u32)(uintptr_t)ptr - (u32)(uintptr_t)lpc_tpm_dev, value); - writel(value, ptr); -} - -/* - * tis_wait_reg() - * - * Wait for at least a second for a register to change its state to match the - * expected state. Normally the transition happens within microseconds. - * - * @reg - pointer to the TPM register - * @mask - bitmask for the bitfield(s) to watch - * @expected - value the field(s) are supposed to be set to - * - * Returns the register contents in case the expected value was found in the - * appropriate register bits, or TPM_TIMEOUT_ERR on timeout. - */ -static u32 tis_wait_reg(u32 *reg, u8 mask, u8 expected) -{ - u32 time_us = MAX_DELAY_US; - - while (time_us > 0) { - u32 value = tpm_read_word(reg); - if ((value & mask) == expected) - return value; - udelay(1); /* 1 us */ - time_us--; - } - return TPM_TIMEOUT_ERR; -} - -/* - * Probe the TPM device and try determining its manufacturer/device name. - * - * Returns 0 on success (the device is found or was found during an earlier - * invocation) or TPM_DRIVER_ERR if the device is not found. - */ -int tis_init(void) -{ - u32 didvid = tpm_read_word(&lpc_tpm_dev[0].did_vid); - int i; - const char *device_name = "unknown"; - const char *vendor_name = device_name; - u16 vid, did; - - if (vendor_dev_id) - return 0; /* Already probed. */ - - if (!didvid || (didvid == 0xffffffff)) { - printf("%s: No TPM device found\n", __func__); - return TPM_DRIVER_ERR; - } - - vendor_dev_id = didvid; - - vid = didvid & 0xffff; - did = (didvid >> 16) & 0xffff; - for (i = 0; i < ARRAY_SIZE(vendor_names); i++) { - int j = 0; - u16 known_did; - - if (vid == vendor_names[i].vendor_id) - vendor_name = vendor_names[i].vendor_name; - - while ((known_did = vendor_names[i].dev_names[j].dev_id) != 0) { - if (known_did == did) { - device_name = - vendor_names[i].dev_names[j].dev_name; - break; - } - j++; - } - break; - } - - printf("Found TPM %s by %s\n", device_name, vendor_name); - return 0; -} - -/* - * tis_senddata() - * - * send the passed in data to the TPM device. - * - * @data - address of the data to send, byte by byte - * @len - length of the data to send - * - * Returns 0 on success, TPM_DRIVER_ERR on error (in case the device does - * not accept the entire command). - */ -static u32 tis_senddata(const u8 * const data, u32 len) -{ - u32 offset = 0; - u16 burst = 0; - u32 max_cycles = 0; - u8 locality = 0; - u32 value; - - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, - TIS_STS_COMMAND_READY, TIS_STS_COMMAND_READY); - if (value == TPM_TIMEOUT_ERR) { - printf("%s:%d - failed to get 'command_ready' status\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } - burst = burst_count(value); - - while (1) { - unsigned count; - - /* Wait till the device is ready to accept more data. */ - while (!burst) { - if (max_cycles++ == MAX_DELAY_US) { - printf("%s:%d failed to feed %d bytes of %d\n", - __FILE__, __LINE__, len - offset, len); - return TPM_DRIVER_ERR; - } - udelay(1); - burst = burst_count(tpm_read_word(&lpc_tpm_dev - [locality].tpm_status)); - } - - max_cycles = 0; - - /* - * Calculate number of bytes the TPM is ready to accept in one - * shot. - * - * We want to send the last byte outside of the loop (hence - * the -1 below) to make sure that the 'expected' status bit - * changes to zero exactly after the last byte is fed into the - * FIFO. - */ - count = min(burst, len - offset - 1); - while (count--) - tpm_write_byte(data[offset++], - &lpc_tpm_dev[locality].data); - - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, - TIS_STS_VALID, TIS_STS_VALID); - - if ((value == TPM_TIMEOUT_ERR) || !(value & TIS_STS_EXPECT)) { - printf("%s:%d TPM command feed overflow\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } - - burst = burst_count(value); - if ((offset == (len - 1)) && burst) { - /* - * We need to be able to send the last byte to the - * device, so burst size must be nonzero before we - * break out. - */ - break; - } - } - - /* Send the last byte. */ - tpm_write_byte(data[offset++], &lpc_tpm_dev[locality].data); - /* - * Verify that TPM does not expect any more data as part of this - * command. - */ - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, - TIS_STS_VALID, TIS_STS_VALID); - if ((value == TPM_TIMEOUT_ERR) || (value & TIS_STS_EXPECT)) { - printf("%s:%d unexpected TPM status 0x%x\n", - __FILE__, __LINE__, value); - return TPM_DRIVER_ERR; - } - - /* OK, sitting pretty, let's start the command execution. */ - tpm_write_word(TIS_STS_TPM_GO, &lpc_tpm_dev[locality].tpm_status); - return 0; -} - -/* - * tis_readresponse() - * - * read the TPM device response after a command was issued. - * - * @buffer - address where to read the response, byte by byte. - * @len - pointer to the size of buffer - * - * On success stores the number of received bytes to len and returns 0. On - * errors (misformatted TPM data or synchronization problems) returns - * TPM_DRIVER_ERR. - */ -static u32 tis_readresponse(u8 *buffer, u32 *len) -{ - u16 burst; - u32 value; - u32 offset = 0; - u8 locality = 0; - const u32 has_data = TIS_STS_DATA_AVAILABLE | TIS_STS_VALID; - u32 expected_count = *len; - int max_cycles = 0; - - /* Wait for the TPM to process the command. */ - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, - has_data, has_data); - if (value == TPM_TIMEOUT_ERR) { - printf("%s:%d failed processing command\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } - - do { - while ((burst = burst_count(value)) == 0) { - if (max_cycles++ == MAX_DELAY_US) { - printf("%s:%d TPM stuck on read\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } - udelay(1); - value = tpm_read_word(&lpc_tpm_dev - [locality].tpm_status); - } - - max_cycles = 0; - - while (burst-- && (offset < expected_count)) { - buffer[offset++] = tpm_read_byte(&lpc_tpm_dev - [locality].data); - - if (offset == 6) { - /* - * We got the first six bytes of the reply, - * let's figure out how many bytes to expect - * total - it is stored as a 4 byte number in - * network order, starting with offset 2 into - * the body of the reply. - */ - u32 real_length; - memcpy(&real_length, - buffer + 2, - sizeof(real_length)); - expected_count = be32_to_cpu(real_length); - - if ((expected_count < offset) || - (expected_count > *len)) { - printf("%s:%d bad response size %d\n", - __FILE__, __LINE__, - expected_count); - return TPM_DRIVER_ERR; - } - } - } - - /* Wait for the next portion. */ - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, - TIS_STS_VALID, TIS_STS_VALID); - if (value == TPM_TIMEOUT_ERR) { - printf("%s:%d failed to read response\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } - - if (offset == expected_count) - break; /* We got all we needed. */ - - } while ((value & has_data) == has_data); - - /* - * Make sure we indeed read all there was. The TIS_STS_VALID bit is - * known to be set. - */ - if (value & TIS_STS_DATA_AVAILABLE) { - printf("%s:%d wrong receive status %x\n", - __FILE__, __LINE__, value); - return TPM_DRIVER_ERR; - } - - /* Tell the TPM that we are done. */ - tpm_write_word(TIS_STS_COMMAND_READY, &lpc_tpm_dev - [locality].tpm_status); - *len = offset; - return 0; -} - -int tis_open(void) -{ - u8 locality = 0; /* we use locality zero for everything. */ - - if (tis_close()) - return TPM_DRIVER_ERR; - - /* now request access to locality. */ - tpm_write_word(TIS_ACCESS_REQUEST_USE, &lpc_tpm_dev[locality].access); - - /* did we get a lock? */ - if (tis_wait_reg(&lpc_tpm_dev[locality].access, - TIS_ACCESS_ACTIVE_LOCALITY, - TIS_ACCESS_ACTIVE_LOCALITY) == TPM_TIMEOUT_ERR) { - printf("%s:%d - failed to lock locality %d\n", - __FILE__, __LINE__, locality); - return TPM_DRIVER_ERR; - } - - tpm_write_word(TIS_STS_COMMAND_READY, - &lpc_tpm_dev[locality].tpm_status); - return 0; -} - -int tis_close(void) -{ - u8 locality = 0; - - if (tpm_read_word(&lpc_tpm_dev[locality].access) & - TIS_ACCESS_ACTIVE_LOCALITY) { - tpm_write_word(TIS_ACCESS_ACTIVE_LOCALITY, - &lpc_tpm_dev[locality].access); - - if (tis_wait_reg(&lpc_tpm_dev[locality].access, - TIS_ACCESS_ACTIVE_LOCALITY, 0) == - TPM_TIMEOUT_ERR) { - printf("%s:%d - failed to release locality %d\n", - __FILE__, __LINE__, locality); - return TPM_DRIVER_ERR; - } - } - return 0; -} - -int tis_sendrecv(const u8 *sendbuf, size_t send_size, - u8 *recvbuf, size_t *recv_len) -{ - if (tis_senddata(sendbuf, send_size)) { - printf("%s:%d failed sending data to TPM\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } - - return tis_readresponse(recvbuf, (u32 *)recv_len); -} |