diff options
Diffstat (limited to 'drivers/tpm/tpm_tis_lpc.c')
| -rw-r--r-- | drivers/tpm/tpm_tis_lpc.c | 290 |
1 files changed, 132 insertions, 158 deletions
diff --git a/drivers/tpm/tpm_tis_lpc.c b/drivers/tpm/tpm_tis_lpc.c index d09f8ce..b41c3ce 100644 --- a/drivers/tpm/tpm_tis_lpc.c +++ b/drivers/tpm/tpm_tis_lpc.c @@ -14,8 +14,11 @@ */ #include <common.h> -#include <asm/io.h> +#include <dm.h> +#include <mapmem.h> +#include <tis.h> #include <tpm.h> +#include <asm/io.h> #define PREFIX "lpc_tpm: " @@ -36,13 +39,15 @@ struct tpm_locality { 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 -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 */ @@ -63,85 +68,45 @@ static struct tpm_locality *lpc_tpm_dev = #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; + 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) +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)lpc_tpm_dev, ret); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, ret); return ret; } -static u32 tpm_read_word(const u32 *ptr) +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)lpc_tpm_dev, ret); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, ret); return ret; } -static void tpm_write_byte(u8 value, u8 *ptr) +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)lpc_tpm_dev, value); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, value); writeb(value, ptr); } -static void tpm_write_word(u32 value, u32 *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)lpc_tpm_dev, value); + (u32)(uintptr_t)ptr - (u32)(uintptr_t)priv->regs, value); writel(value, ptr); } @@ -156,67 +121,51 @@ static void tpm_write_word(u32 value, u32 *ptr) * @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. + * appropriate register bits, or -ETIMEDOUT on timeout. */ -static u32 tis_wait_reg(u32 *reg, u8 mask, u8 expected) +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(reg); + u32 value = tpm_read_word(priv, reg); if ((value & mask) == expected) return value; udelay(1); /* 1 us */ time_us--; } - return TPM_TIMEOUT_ERR; + + return -ETIMEDOUT; } /* * 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. + * Returns 0 on success, -ve on error */ -int tis_init(void) +static int tpm_tis_lpc_probe(struct udevice *dev) { - 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; - } + struct tpm_tis_lpc_priv *priv = dev_get_priv(dev); + u32 vid, did; + fdt_addr_t addr; + u32 didvid; - vendor_dev_id = didvid; + addr = dev_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); 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; + if (vid != 0x15d1 || did != 0xb) { + debug("Invalid vendor/device ID %04x/%04x\n", vid, did); + return -ENOSYS; } - printf("Found TPM %s by %s\n", device_name, vendor_name); + debug("Found TPM %s by %s\n", "SLB9635 TT 1.2", "Infineon"); + return 0; } @@ -228,23 +177,25 @@ int tis_init(void) * @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). + * Returns 0 on success, -ve on error (in case the device does not accept + * the entire command). */ -static u32 tis_senddata(const u8 * const data, u32 len) +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(&lpc_tpm_dev[locality].tpm_status, + value = tis_wait_reg(priv, ®s[locality].tpm_status, TIS_STS_COMMAND_READY, TIS_STS_COMMAND_READY); - if (value == TPM_TIMEOUT_ERR) { + if (value == -ETIMEDOUT) { printf("%s:%d - failed to get 'command_ready' status\n", __FILE__, __LINE__); - return TPM_DRIVER_ERR; + return value; } burst = burst_count(value); @@ -256,11 +207,11 @@ static u32 tis_senddata(const u8 * const data, u32 len) 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; + return -ETIMEDOUT; } udelay(1); - burst = burst_count(tpm_read_word(&lpc_tpm_dev - [locality].tpm_status)); + burst = burst_count(tpm_read_word(priv, + ®s[locality].tpm_status)); } max_cycles = 0; @@ -276,16 +227,16 @@ static u32 tis_senddata(const u8 * const data, u32 len) */ count = min((u32)burst, len - offset - 1); while (count--) - tpm_write_byte(data[offset++], - &lpc_tpm_dev[locality].data); + tpm_write_byte(priv, data[offset++], + ®s[locality].data); - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, + value = tis_wait_reg(priv, ®s[locality].tpm_status, TIS_STS_VALID, TIS_STS_VALID); - if ((value == TPM_TIMEOUT_ERR) || !(value & TIS_STS_EXPECT)) { + if ((value == -ETIMEDOUT) || !(value & TIS_STS_EXPECT)) { printf("%s:%d TPM command feed overflow\n", __FILE__, __LINE__); - return TPM_DRIVER_ERR; + return value == -ETIMEDOUT ? value : -EIO; } burst = burst_count(value); @@ -300,21 +251,21 @@ static u32 tis_senddata(const u8 * const data, u32 len) } /* Send the last byte. */ - tpm_write_byte(data[offset++], &lpc_tpm_dev[locality].data); + 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(&lpc_tpm_dev[locality].tpm_status, + value = tis_wait_reg(priv, ®s[locality].tpm_status, TIS_STS_VALID, TIS_STS_VALID); - if ((value == TPM_TIMEOUT_ERR) || (value & TIS_STS_EXPECT)) { + if ((value == -ETIMEDOUT) || (value & TIS_STS_EXPECT)) { printf("%s:%d unexpected TPM status 0x%x\n", __FILE__, __LINE__, value); - return TPM_DRIVER_ERR; + return value == -ETIMEDOUT ? value : -EIO; } /* OK, sitting pretty, let's start the command execution. */ - tpm_write_word(TIS_STS_TPM_GO, &lpc_tpm_dev[locality].tpm_status); + tpm_write_word(priv, TIS_STS_TPM_GO, ®s[locality].tpm_status); return 0; } @@ -328,25 +279,27 @@ static u32 tis_senddata(const u8 * const data, u32 len) * * 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. + * -ve value. */ -static u32 tis_readresponse(u8 *buffer, u32 *len) +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; + 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, + value = tis_wait_reg(priv, ®s[locality].tpm_status, has_data, has_data); - if (value == TPM_TIMEOUT_ERR) { + if (value == -ETIMEDOUT) { printf("%s:%d failed processing command\n", __FILE__, __LINE__); - return TPM_DRIVER_ERR; + return value; } do { @@ -354,18 +307,17 @@ static u32 tis_readresponse(u8 *buffer, u32 *len) if (max_cycles++ == MAX_DELAY_US) { printf("%s:%d TPM stuck on read\n", __FILE__, __LINE__); - return TPM_DRIVER_ERR; + return -EIO; } udelay(1); - value = tpm_read_word(&lpc_tpm_dev - [locality].tpm_status); + value = tpm_read_word(priv, ®s[locality].tpm_status); } max_cycles = 0; while (burst-- && (offset < expected_count)) { - buffer[offset++] = tpm_read_byte(&lpc_tpm_dev - [locality].data); + buffer[offset++] = tpm_read_byte(priv, + ®s[locality].data); if (offset == 6) { /* @@ -382,22 +334,22 @@ static u32 tis_readresponse(u8 *buffer, u32 *len) expected_count = be32_to_cpu(real_length); if ((expected_count < offset) || - (expected_count > *len)) { + (expected_count > len)) { printf("%s:%d bad response size %d\n", __FILE__, __LINE__, expected_count); - return TPM_DRIVER_ERR; + return -ENOSPC; } } } /* Wait for the next portion. */ - value = tis_wait_reg(&lpc_tpm_dev[locality].tpm_status, + value = tis_wait_reg(priv, ®s[locality].tpm_status, TIS_STS_VALID, TIS_STS_VALID); - if (value == TPM_TIMEOUT_ERR) { + if (value == -ETIMEDOUT) { printf("%s:%d failed to read response\n", __FILE__, __LINE__); - return TPM_DRIVER_ERR; + return value; } if (offset == expected_count) @@ -412,68 +364,90 @@ static u32 tis_readresponse(u8 *buffer, u32 *len) if (value & TIS_STS_DATA_AVAILABLE) { printf("%s:%d wrong receive status %x\n", __FILE__, __LINE__, value); - return TPM_DRIVER_ERR; + return -EBADMSG; } /* Tell the TPM that we are done. */ - tpm_write_word(TIS_STS_COMMAND_READY, &lpc_tpm_dev - [locality].tpm_status); - *len = offset; - return 0; + tpm_write_word(priv, TIS_STS_COMMAND_READY, + ®s[locality].tpm_status); + + return offset; } -int tis_open(void) +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. */ - - if (tis_close()) - return TPM_DRIVER_ERR; + int ret; /* now request access to locality. */ - tpm_write_word(TIS_ACCESS_REQUEST_USE, &lpc_tpm_dev[locality].access); + tpm_write_word(priv, TIS_ACCESS_REQUEST_USE, ®s[locality].access); /* did we get a lock? */ - if (tis_wait_reg(&lpc_tpm_dev[locality].access, + ret = tis_wait_reg(priv, ®s[locality].access, TIS_ACCESS_ACTIVE_LOCALITY, - TIS_ACCESS_ACTIVE_LOCALITY) == TPM_TIMEOUT_ERR) { + TIS_ACCESS_ACTIVE_LOCALITY); + if (ret == -ETIMEDOUT) { printf("%s:%d - failed to lock locality %d\n", __FILE__, __LINE__, locality); - return TPM_DRIVER_ERR; + return ret; } - tpm_write_word(TIS_STS_COMMAND_READY, - &lpc_tpm_dev[locality].tpm_status); + tpm_write_word(priv, TIS_STS_COMMAND_READY, + ®s[locality].tpm_status); return 0; } -int tis_close(void) +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(&lpc_tpm_dev[locality].access) & + if (tpm_read_word(priv, ®s[locality].access) & TIS_ACCESS_ACTIVE_LOCALITY) { - tpm_write_word(TIS_ACCESS_ACTIVE_LOCALITY, - &lpc_tpm_dev[locality].access); + tpm_write_word(priv, TIS_ACCESS_ACTIVE_LOCALITY, + ®s[locality].access); - if (tis_wait_reg(&lpc_tpm_dev[locality].access, - TIS_ACCESS_ACTIVE_LOCALITY, 0) == - TPM_TIMEOUT_ERR) { + 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 TPM_DRIVER_ERR; + return -ETIMEDOUT; } } return 0; } -int tis_sendrecv(const u8 *sendbuf, size_t send_size, - u8 *recvbuf, size_t *recv_len) +static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size) { - if (tis_senddata(sendbuf, send_size)) { - printf("%s:%d failed sending data to TPM\n", - __FILE__, __LINE__); - return TPM_DRIVER_ERR; - } + if (size < 50) + return -ENOSPC; - return tis_readresponse(recvbuf, (u32 *)recv_len); + return snprintf(buf, size, "1.2 TPM (vendor %s, chip %s)", + "Infineon", "SLB9635 TT 1.2"); } + + +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" }, + { } +}; + +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), +}; |