mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 08:58:52 +09:00
![Simon Glass](/assets/img/avatar_default.png)
These support the flat device tree. We want to use the dev_read_..() prefix for functions that support both flat tree and live tree. So rename the existing functions to avoid confusion. In the end we will have: 1. dev_read_addr...() - works on devices, supports flat/live tree 2. devfdt_get_addr...() - current functions, flat tree only 3. of_get_address() etc. - new functions, live tree only All drivers will be written to use 1. That function will in turn call either 2 or 3 depending on whether the flat or live tree is in use. Note this involves changing some dead code - the imx_lpi2c.c file. Signed-off-by: Simon Glass <sjg@chromium.org>
472 lines
12 KiB
C
472 lines
12 KiB
C
/*
|
|
* 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 <dm.h>
|
|
#include <mapmem.h>
|
|
#include <tpm.h>
|
|
#include <asm/io.h>
|
|
|
|
#define PREFIX "lpc_tpm: "
|
|
|
|
enum i2c_chip_type {
|
|
SLB9635,
|
|
AT97SC3204,
|
|
};
|
|
|
|
static const char * const chip_name[] = {
|
|
[SLB9635] = "Infineon SLB9635 TT 1.2",
|
|
[AT97SC3204] = "Atmel AT97SC3204",
|
|
};
|
|
|
|
static const u32 chip_didvid[] = {
|
|
[SLB9635] = 0xb15d1,
|
|
[AT97SC3204] = 0x32041114,
|
|
};
|
|
|
|
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];
|
|
};
|
|
|
|
struct tpm_tis_lpc_priv {
|
|
struct tpm_locality *regs;
|
|
};
|
|
|
|
/*
|
|
* This pointer refers to the TPM chip, 5 of its localities are mapped as an
|
|
* array.
|
|
*/
|
|
#define TPM_TOTAL_LOCALITIES 5
|
|
|
|
/* 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)
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* TPM access wrappers to support tracing */
|
|
static u8 tpm_read_byte(struct tpm_tis_lpc_priv *priv, 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)priv->regs, ret);
|
|
return ret;
|
|
}
|
|
|
|
static u32 tpm_read_word(struct tpm_tis_lpc_priv *priv, 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)priv->regs, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void tpm_write_byte(struct tpm_tis_lpc_priv *priv, u8 value, u8 *ptr)
|
|
{
|
|
debug(PREFIX "Write reg 0x%4.4x with 0x%2.2x\n",
|
|
(u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, value);
|
|
writeb(value, ptr);
|
|
}
|
|
|
|
static void tpm_write_word(struct tpm_tis_lpc_priv *priv, u32 value,
|
|
u32 *ptr)
|
|
{
|
|
debug(PREFIX "Write reg 0x%4.4x with 0x%8.8x\n",
|
|
(u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, 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 -ETIMEDOUT on timeout.
|
|
*/
|
|
static int tis_wait_reg(struct tpm_tis_lpc_priv *priv, u32 *reg, u8 mask,
|
|
u8 expected)
|
|
{
|
|
u32 time_us = MAX_DELAY_US;
|
|
|
|
while (time_us > 0) {
|
|
u32 value = tpm_read_word(priv, reg);
|
|
if ((value & mask) == expected)
|
|
return value;
|
|
udelay(1); /* 1 us */
|
|
time_us--;
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
/*
|
|
* Probe the TPM device and try determining its manufacturer/device name.
|
|
*
|
|
* Returns 0 on success, -ve on error
|
|
*/
|
|
static int tpm_tis_lpc_probe(struct udevice *dev)
|
|
{
|
|
struct tpm_tis_lpc_priv *priv = dev_get_priv(dev);
|
|
fdt_addr_t addr;
|
|
u32 didvid;
|
|
ulong chip_type = dev_get_driver_data(dev);
|
|
|
|
addr = devfdt_get_addr(dev);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
priv->regs = map_sysmem(addr, 0);
|
|
didvid = tpm_read_word(priv, &priv->regs[0].did_vid);
|
|
|
|
if (didvid != chip_didvid[chip_type]) {
|
|
u32 vid, did;
|
|
vid = didvid & 0xffff;
|
|
did = (didvid >> 16) & 0xffff;
|
|
debug("Invalid vendor/device ID %04x/%04x\n", vid, did);
|
|
return -ENODEV;
|
|
}
|
|
|
|
debug("Found TPM: %s\n", chip_name[chip_type]);
|
|
|
|
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, -ve on error (in case the device does not accept
|
|
* the entire command).
|
|
*/
|
|
static int tis_senddata(struct udevice *dev, const u8 *data, size_t len)
|
|
{
|
|
struct tpm_tis_lpc_priv *priv = dev_get_priv(dev);
|
|
struct tpm_locality *regs = priv->regs;
|
|
u32 offset = 0;
|
|
u16 burst = 0;
|
|
u32 max_cycles = 0;
|
|
u8 locality = 0;
|
|
u32 value;
|
|
|
|
value = tis_wait_reg(priv, ®s[locality].tpm_status,
|
|
TIS_STS_COMMAND_READY, TIS_STS_COMMAND_READY);
|
|
if (value == -ETIMEDOUT) {
|
|
printf("%s:%d - failed to get 'command_ready' status\n",
|
|
__FILE__, __LINE__);
|
|
return value;
|
|
}
|
|
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 %zd bytes of %zd\n",
|
|
__FILE__, __LINE__, len - offset, len);
|
|
return -ETIMEDOUT;
|
|
}
|
|
udelay(1);
|
|
burst = burst_count(tpm_read_word(priv,
|
|
®s[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((size_t)burst, len - offset - 1);
|
|
while (count--)
|
|
tpm_write_byte(priv, data[offset++],
|
|
®s[locality].data);
|
|
|
|
value = tis_wait_reg(priv, ®s[locality].tpm_status,
|
|
TIS_STS_VALID, TIS_STS_VALID);
|
|
|
|
if ((value == -ETIMEDOUT) || !(value & TIS_STS_EXPECT)) {
|
|
printf("%s:%d TPM command feed overflow\n",
|
|
__FILE__, __LINE__);
|
|
return value == -ETIMEDOUT ? value : -EIO;
|
|
}
|
|
|
|
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(priv, data[offset++], ®s[locality].data);
|
|
/*
|
|
* Verify that TPM does not expect any more data as part of this
|
|
* command.
|
|
*/
|
|
value = tis_wait_reg(priv, ®s[locality].tpm_status,
|
|
TIS_STS_VALID, TIS_STS_VALID);
|
|
if ((value == -ETIMEDOUT) || (value & TIS_STS_EXPECT)) {
|
|
printf("%s:%d unexpected TPM status 0x%x\n",
|
|
__FILE__, __LINE__, value);
|
|
return value == -ETIMEDOUT ? value : -EIO;
|
|
}
|
|
|
|
/* OK, sitting pretty, let's start the command execution. */
|
|
tpm_write_word(priv, TIS_STS_TPM_GO, ®s[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
|
|
* -ve value.
|
|
*/
|
|
static int tis_readresponse(struct udevice *dev, u8 *buffer, size_t len)
|
|
{
|
|
struct tpm_tis_lpc_priv *priv = dev_get_priv(dev);
|
|
struct tpm_locality *regs = priv->regs;
|
|
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(priv, ®s[locality].tpm_status,
|
|
has_data, has_data);
|
|
if (value == -ETIMEDOUT) {
|
|
printf("%s:%d failed processing command\n",
|
|
__FILE__, __LINE__);
|
|
return value;
|
|
}
|
|
|
|
do {
|
|
while ((burst = burst_count(value)) == 0) {
|
|
if (max_cycles++ == MAX_DELAY_US) {
|
|
printf("%s:%d TPM stuck on read\n",
|
|
__FILE__, __LINE__);
|
|
return -EIO;
|
|
}
|
|
udelay(1);
|
|
value = tpm_read_word(priv, ®s[locality].tpm_status);
|
|
}
|
|
|
|
max_cycles = 0;
|
|
|
|
while (burst-- && (offset < expected_count)) {
|
|
buffer[offset++] = tpm_read_byte(priv,
|
|
®s[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 -ENOSPC;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Wait for the next portion. */
|
|
value = tis_wait_reg(priv, ®s[locality].tpm_status,
|
|
TIS_STS_VALID, TIS_STS_VALID);
|
|
if (value == -ETIMEDOUT) {
|
|
printf("%s:%d failed to read response\n",
|
|
__FILE__, __LINE__);
|
|
return value;
|
|
}
|
|
|
|
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 -EBADMSG;
|
|
}
|
|
|
|
/* Tell the TPM that we are done. */
|
|
tpm_write_word(priv, TIS_STS_COMMAND_READY,
|
|
®s[locality].tpm_status);
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int tpm_tis_lpc_open(struct udevice *dev)
|
|
{
|
|
struct tpm_tis_lpc_priv *priv = dev_get_priv(dev);
|
|
struct tpm_locality *regs = priv->regs;
|
|
u8 locality = 0; /* we use locality zero for everything. */
|
|
int ret;
|
|
|
|
/* now request access to locality. */
|
|
tpm_write_word(priv, TIS_ACCESS_REQUEST_USE, ®s[locality].access);
|
|
|
|
/* did we get a lock? */
|
|
ret = tis_wait_reg(priv, ®s[locality].access,
|
|
TIS_ACCESS_ACTIVE_LOCALITY,
|
|
TIS_ACCESS_ACTIVE_LOCALITY);
|
|
if (ret == -ETIMEDOUT) {
|
|
printf("%s:%d - failed to lock locality %d\n",
|
|
__FILE__, __LINE__, locality);
|
|
return ret;
|
|
}
|
|
|
|
tpm_write_word(priv, TIS_STS_COMMAND_READY,
|
|
®s[locality].tpm_status);
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_tis_lpc_close(struct udevice *dev)
|
|
{
|
|
struct tpm_tis_lpc_priv *priv = dev_get_priv(dev);
|
|
struct tpm_locality *regs = priv->regs;
|
|
u8 locality = 0;
|
|
|
|
if (tpm_read_word(priv, ®s[locality].access) &
|
|
TIS_ACCESS_ACTIVE_LOCALITY) {
|
|
tpm_write_word(priv, TIS_ACCESS_ACTIVE_LOCALITY,
|
|
®s[locality].access);
|
|
|
|
if (tis_wait_reg(priv, ®s[locality].access,
|
|
TIS_ACCESS_ACTIVE_LOCALITY, 0) == -ETIMEDOUT) {
|
|
printf("%s:%d - failed to release locality %d\n",
|
|
__FILE__, __LINE__, locality);
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size)
|
|
{
|
|
ulong chip_type = dev_get_driver_data(dev);
|
|
|
|
if (size < 50)
|
|
return -ENOSPC;
|
|
|
|
return snprintf(buf, size, "1.2 TPM (%s)",
|
|
chip_name[chip_type]);
|
|
}
|
|
|
|
|
|
static const struct tpm_ops tpm_tis_lpc_ops = {
|
|
.open = tpm_tis_lpc_open,
|
|
.close = tpm_tis_lpc_close,
|
|
.get_desc = tpm_tis_get_desc,
|
|
.send = tis_senddata,
|
|
.recv = tis_readresponse,
|
|
};
|
|
|
|
static const struct udevice_id tpm_tis_lpc_ids[] = {
|
|
{ .compatible = "infineon,slb9635lpc", .data = SLB9635 },
|
|
{ .compatible = "atmel,at97sc3204", .data = AT97SC3204 },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(tpm_tis_lpc) = {
|
|
.name = "tpm_tis_lpc",
|
|
.id = UCLASS_TPM,
|
|
.of_match = tpm_tis_lpc_ids,
|
|
.ops = &tpm_tis_lpc_ops,
|
|
.probe = tpm_tis_lpc_probe,
|
|
.priv_auto_alloc_size = sizeof(struct tpm_tis_lpc_priv),
|
|
};
|