![Winkler, Tomas](/assets/img/avatar_default.png)
In crb_map_io() function, __crb_request_locality() is called prior
to crb_cmd_ready(), but if one of the consecutive function fails
the flow bails out instead of trying to relinquish locality.
This patch adds goto jump to __crb_relinquish_locality() on the error path.
Fixes: 888d867df4
(tpm: cmd_ready command can be issued only after granting locality)
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
737 lines
17 KiB
C
737 lines
17 KiB
C
/*
|
|
* Copyright (C) 2014 Intel Corporation
|
|
*
|
|
* Authors:
|
|
* Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
|
|
*
|
|
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
|
|
*
|
|
* This device driver implements the TPM interface as defined in
|
|
* the TCG CRB 2.0 TPM specification.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2
|
|
* of the License.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/rculist.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pm_runtime.h>
|
|
#ifdef CONFIG_ARM64
|
|
#include <linux/arm-smccc.h>
|
|
#endif
|
|
#include "tpm.h"
|
|
|
|
#define ACPI_SIG_TPM2 "TPM2"
|
|
|
|
static const guid_t crb_acpi_start_guid =
|
|
GUID_INIT(0x6BBF6CAB, 0x5463, 0x4714,
|
|
0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4);
|
|
|
|
enum crb_defaults {
|
|
CRB_ACPI_START_REVISION_ID = 1,
|
|
CRB_ACPI_START_INDEX = 1,
|
|
};
|
|
|
|
enum crb_loc_ctrl {
|
|
CRB_LOC_CTRL_REQUEST_ACCESS = BIT(0),
|
|
CRB_LOC_CTRL_RELINQUISH = BIT(1),
|
|
};
|
|
|
|
enum crb_loc_state {
|
|
CRB_LOC_STATE_LOC_ASSIGNED = BIT(1),
|
|
CRB_LOC_STATE_TPM_REG_VALID_STS = BIT(7),
|
|
};
|
|
|
|
enum crb_ctrl_req {
|
|
CRB_CTRL_REQ_CMD_READY = BIT(0),
|
|
CRB_CTRL_REQ_GO_IDLE = BIT(1),
|
|
};
|
|
|
|
enum crb_ctrl_sts {
|
|
CRB_CTRL_STS_ERROR = BIT(0),
|
|
CRB_CTRL_STS_TPM_IDLE = BIT(1),
|
|
};
|
|
|
|
enum crb_start {
|
|
CRB_START_INVOKE = BIT(0),
|
|
};
|
|
|
|
enum crb_cancel {
|
|
CRB_CANCEL_INVOKE = BIT(0),
|
|
};
|
|
|
|
struct crb_regs_head {
|
|
u32 loc_state;
|
|
u32 reserved1;
|
|
u32 loc_ctrl;
|
|
u32 loc_sts;
|
|
u8 reserved2[32];
|
|
u64 intf_id;
|
|
u64 ctrl_ext;
|
|
} __packed;
|
|
|
|
struct crb_regs_tail {
|
|
u32 ctrl_req;
|
|
u32 ctrl_sts;
|
|
u32 ctrl_cancel;
|
|
u32 ctrl_start;
|
|
u32 ctrl_int_enable;
|
|
u32 ctrl_int_sts;
|
|
u32 ctrl_cmd_size;
|
|
u32 ctrl_cmd_pa_low;
|
|
u32 ctrl_cmd_pa_high;
|
|
u32 ctrl_rsp_size;
|
|
u64 ctrl_rsp_pa;
|
|
} __packed;
|
|
|
|
enum crb_status {
|
|
CRB_DRV_STS_COMPLETE = BIT(0),
|
|
};
|
|
|
|
struct crb_priv {
|
|
u32 sm;
|
|
const char *hid;
|
|
void __iomem *iobase;
|
|
struct crb_regs_head __iomem *regs_h;
|
|
struct crb_regs_tail __iomem *regs_t;
|
|
u8 __iomem *cmd;
|
|
u8 __iomem *rsp;
|
|
u32 cmd_size;
|
|
u32 smc_func_id;
|
|
};
|
|
|
|
struct tpm2_crb_smc {
|
|
u32 interrupt;
|
|
u8 interrupt_flags;
|
|
u8 op_flags;
|
|
u16 reserved2;
|
|
u32 smc_func_id;
|
|
};
|
|
|
|
static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
|
|
unsigned long timeout)
|
|
{
|
|
ktime_t start;
|
|
ktime_t stop;
|
|
|
|
start = ktime_get();
|
|
stop = ktime_add(start, ms_to_ktime(timeout));
|
|
|
|
do {
|
|
if ((ioread32(reg) & mask) == value)
|
|
return true;
|
|
|
|
usleep_range(50, 100);
|
|
} while (ktime_before(ktime_get(), stop));
|
|
|
|
return ((ioread32(reg) & mask) == value);
|
|
}
|
|
|
|
/**
|
|
* crb_go_idle - request tpm crb device to go the idle state
|
|
*
|
|
* @dev: crb device
|
|
* @priv: crb private data
|
|
*
|
|
* Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
|
|
* The device should respond within TIMEOUT_C by clearing the bit.
|
|
* Anyhow, we do not wait here as a consequent CMD_READY request
|
|
* will be handled correctly even if idle was not completed.
|
|
*
|
|
* The function does nothing for devices with ACPI-start method
|
|
* or SMC-start method.
|
|
*
|
|
* Return: 0 always
|
|
*/
|
|
static int crb_go_idle(struct device *dev, struct crb_priv *priv)
|
|
{
|
|
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
|
|
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
|
|
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
|
|
return 0;
|
|
|
|
iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
|
|
|
|
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
|
|
CRB_CTRL_REQ_GO_IDLE/* mask */,
|
|
0, /* value */
|
|
TPM2_TIMEOUT_C)) {
|
|
dev_warn(dev, "goIdle timed out\n");
|
|
return -ETIME;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* crb_cmd_ready - request tpm crb device to enter ready state
|
|
*
|
|
* @dev: crb device
|
|
* @priv: crb private data
|
|
*
|
|
* Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
|
|
* and poll till the device acknowledge it by clearing the bit.
|
|
* The device should respond within TIMEOUT_C.
|
|
*
|
|
* The function does nothing for devices with ACPI-start method
|
|
* or SMC-start method.
|
|
*
|
|
* Return: 0 on success -ETIME on timeout;
|
|
*/
|
|
static int crb_cmd_ready(struct device *dev, struct crb_priv *priv)
|
|
{
|
|
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
|
|
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD) ||
|
|
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC))
|
|
return 0;
|
|
|
|
iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req);
|
|
if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
|
|
CRB_CTRL_REQ_CMD_READY /* mask */,
|
|
0, /* value */
|
|
TPM2_TIMEOUT_C)) {
|
|
dev_warn(dev, "cmdReady timed out\n");
|
|
return -ETIME;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __crb_request_locality(struct device *dev,
|
|
struct crb_priv *priv, int loc)
|
|
{
|
|
u32 value = CRB_LOC_STATE_LOC_ASSIGNED |
|
|
CRB_LOC_STATE_TPM_REG_VALID_STS;
|
|
|
|
if (!priv->regs_h)
|
|
return 0;
|
|
|
|
iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
|
|
if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value,
|
|
TPM2_TIMEOUT_C)) {
|
|
dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
|
|
return -ETIME;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crb_request_locality(struct tpm_chip *chip, int loc)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
|
|
return __crb_request_locality(&chip->dev, priv, loc);
|
|
}
|
|
|
|
static int __crb_relinquish_locality(struct device *dev,
|
|
struct crb_priv *priv, int loc)
|
|
{
|
|
u32 mask = CRB_LOC_STATE_LOC_ASSIGNED |
|
|
CRB_LOC_STATE_TPM_REG_VALID_STS;
|
|
u32 value = CRB_LOC_STATE_TPM_REG_VALID_STS;
|
|
|
|
if (!priv->regs_h)
|
|
return 0;
|
|
|
|
iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
|
|
if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value,
|
|
TPM2_TIMEOUT_C)) {
|
|
dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
|
|
return -ETIME;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crb_relinquish_locality(struct tpm_chip *chip, int loc)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
|
|
return __crb_relinquish_locality(&chip->dev, priv, loc);
|
|
}
|
|
|
|
static u8 crb_status(struct tpm_chip *chip)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
u8 sts = 0;
|
|
|
|
if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) !=
|
|
CRB_START_INVOKE)
|
|
sts |= CRB_DRV_STS_COMPLETE;
|
|
|
|
return sts;
|
|
}
|
|
|
|
static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
unsigned int expected;
|
|
|
|
/* sanity check */
|
|
if (count < 6)
|
|
return -EIO;
|
|
|
|
if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR)
|
|
return -EIO;
|
|
|
|
memcpy_fromio(buf, priv->rsp, 6);
|
|
expected = be32_to_cpup((__be32 *) &buf[2]);
|
|
if (expected > count || expected < 6)
|
|
return -EIO;
|
|
|
|
memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6);
|
|
|
|
return expected;
|
|
}
|
|
|
|
static int crb_do_acpi_start(struct tpm_chip *chip)
|
|
{
|
|
union acpi_object *obj;
|
|
int rc;
|
|
|
|
obj = acpi_evaluate_dsm(chip->acpi_dev_handle,
|
|
&crb_acpi_start_guid,
|
|
CRB_ACPI_START_REVISION_ID,
|
|
CRB_ACPI_START_INDEX,
|
|
NULL);
|
|
if (!obj)
|
|
return -ENXIO;
|
|
rc = obj->integer.value == 0 ? 0 : -ENXIO;
|
|
ACPI_FREE(obj);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_ARM64
|
|
/*
|
|
* This is a TPM Command Response Buffer start method that invokes a
|
|
* Secure Monitor Call to requrest the firmware to execute or cancel
|
|
* a TPM 2.0 command.
|
|
*/
|
|
static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
|
|
{
|
|
struct arm_smccc_res res;
|
|
|
|
arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res);
|
|
if (res.a0 != 0) {
|
|
dev_err(dev,
|
|
FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n",
|
|
res.a0);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
|
|
{
|
|
dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n");
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
int rc = 0;
|
|
|
|
/* Zero the cancel register so that the next command will not get
|
|
* canceled.
|
|
*/
|
|
iowrite32(0, &priv->regs_t->ctrl_cancel);
|
|
|
|
if (len > priv->cmd_size) {
|
|
dev_err(&chip->dev, "invalid command count value %zd %d\n",
|
|
len, priv->cmd_size);
|
|
return -E2BIG;
|
|
}
|
|
|
|
memcpy_toio(priv->cmd, buf, len);
|
|
|
|
/* Make sure that cmd is populated before issuing start. */
|
|
wmb();
|
|
|
|
/* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs
|
|
* report only ACPI start but in practice seems to require both
|
|
* CRB start, hence invoking CRB start method if hid == MSFT0101.
|
|
*/
|
|
if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) ||
|
|
(priv->sm == ACPI_TPM2_MEMORY_MAPPED) ||
|
|
(!strcmp(priv->hid, "MSFT0101")))
|
|
iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
|
|
|
|
if ((priv->sm == ACPI_TPM2_START_METHOD) ||
|
|
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD))
|
|
rc = crb_do_acpi_start(chip);
|
|
|
|
if (priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
|
|
iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
|
|
rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void crb_cancel(struct tpm_chip *chip)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
|
|
iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel);
|
|
|
|
if (((priv->sm == ACPI_TPM2_START_METHOD) ||
|
|
(priv->sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)) &&
|
|
crb_do_acpi_start(chip))
|
|
dev_err(&chip->dev, "ACPI Start failed\n");
|
|
}
|
|
|
|
static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
|
|
{
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
u32 cancel = ioread32(&priv->regs_t->ctrl_cancel);
|
|
|
|
return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE;
|
|
}
|
|
|
|
static const struct tpm_class_ops tpm_crb = {
|
|
.flags = TPM_OPS_AUTO_STARTUP,
|
|
.status = crb_status,
|
|
.recv = crb_recv,
|
|
.send = crb_send,
|
|
.cancel = crb_cancel,
|
|
.req_canceled = crb_req_canceled,
|
|
.request_locality = crb_request_locality,
|
|
.relinquish_locality = crb_relinquish_locality,
|
|
.req_complete_mask = CRB_DRV_STS_COMPLETE,
|
|
.req_complete_val = CRB_DRV_STS_COMPLETE,
|
|
};
|
|
|
|
static int crb_check_resource(struct acpi_resource *ares, void *data)
|
|
{
|
|
struct resource *io_res = data;
|
|
struct resource_win win;
|
|
struct resource *res = &(win.res);
|
|
|
|
if (acpi_dev_resource_memory(ares, res) ||
|
|
acpi_dev_resource_address_space(ares, &win)) {
|
|
*io_res = *res;
|
|
io_res->name = NULL;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void __iomem *crb_map_res(struct device *dev, struct crb_priv *priv,
|
|
struct resource *io_res, u64 start, u32 size)
|
|
{
|
|
struct resource new_res = {
|
|
.start = start,
|
|
.end = start + size - 1,
|
|
.flags = IORESOURCE_MEM,
|
|
};
|
|
|
|
/* Detect a 64 bit address on a 32 bit system */
|
|
if (start != new_res.start)
|
|
return (void __iomem *) ERR_PTR(-EINVAL);
|
|
|
|
if (!resource_contains(io_res, &new_res))
|
|
return devm_ioremap_resource(dev, &new_res);
|
|
|
|
return priv->iobase + (new_res.start - io_res->start);
|
|
}
|
|
|
|
/*
|
|
* Work around broken BIOSs that return inconsistent values from the ACPI
|
|
* region vs the registers. Trust the ACPI region. Such broken systems
|
|
* probably cannot send large TPM commands since the buffer will be truncated.
|
|
*/
|
|
static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res,
|
|
u64 start, u64 size)
|
|
{
|
|
if (io_res->start > start || io_res->end < start)
|
|
return size;
|
|
|
|
if (start + size - 1 <= io_res->end)
|
|
return size;
|
|
|
|
dev_err(dev,
|
|
FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n",
|
|
io_res, start, size);
|
|
|
|
return io_res->end - start + 1;
|
|
}
|
|
|
|
static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
|
|
struct acpi_table_tpm2 *buf)
|
|
{
|
|
struct list_head resources;
|
|
struct resource io_res;
|
|
struct device *dev = &device->dev;
|
|
u32 pa_high, pa_low;
|
|
u64 cmd_pa;
|
|
u32 cmd_size;
|
|
__le64 __rsp_pa;
|
|
u64 rsp_pa;
|
|
u32 rsp_size;
|
|
int ret;
|
|
|
|
INIT_LIST_HEAD(&resources);
|
|
ret = acpi_dev_get_resources(device, &resources, crb_check_resource,
|
|
&io_res);
|
|
if (ret < 0)
|
|
return ret;
|
|
acpi_dev_free_resource_list(&resources);
|
|
|
|
if (resource_type(&io_res) != IORESOURCE_MEM) {
|
|
dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
priv->iobase = devm_ioremap_resource(dev, &io_res);
|
|
if (IS_ERR(priv->iobase))
|
|
return PTR_ERR(priv->iobase);
|
|
|
|
/* The ACPI IO region starts at the head area and continues to include
|
|
* the control area, as one nice sane region except for some older
|
|
* stuff that puts the control area outside the ACPI IO region.
|
|
*/
|
|
if ((priv->sm == ACPI_TPM2_COMMAND_BUFFER) ||
|
|
(priv->sm == ACPI_TPM2_MEMORY_MAPPED)) {
|
|
if (buf->control_address == io_res.start +
|
|
sizeof(*priv->regs_h))
|
|
priv->regs_h = priv->iobase;
|
|
else
|
|
dev_warn(dev, FW_BUG "Bad ACPI memory layout");
|
|
}
|
|
|
|
ret = __crb_request_locality(dev, priv, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address,
|
|
sizeof(struct crb_regs_tail));
|
|
if (IS_ERR(priv->regs_t)) {
|
|
ret = PTR_ERR(priv->regs_t);
|
|
goto out_relinquish_locality;
|
|
}
|
|
|
|
/*
|
|
* PTT HW bug w/a: wake up the device to access
|
|
* possibly not retained registers.
|
|
*/
|
|
ret = crb_cmd_ready(dev, priv);
|
|
if (ret)
|
|
goto out_relinquish_locality;
|
|
|
|
pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high);
|
|
pa_low = ioread32(&priv->regs_t->ctrl_cmd_pa_low);
|
|
cmd_pa = ((u64)pa_high << 32) | pa_low;
|
|
cmd_size = crb_fixup_cmd_size(dev, &io_res, cmd_pa,
|
|
ioread32(&priv->regs_t->ctrl_cmd_size));
|
|
|
|
dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n",
|
|
pa_high, pa_low, cmd_size);
|
|
|
|
priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size);
|
|
if (IS_ERR(priv->cmd)) {
|
|
ret = PTR_ERR(priv->cmd);
|
|
goto out;
|
|
}
|
|
|
|
memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8);
|
|
rsp_pa = le64_to_cpu(__rsp_pa);
|
|
rsp_size = crb_fixup_cmd_size(dev, &io_res, rsp_pa,
|
|
ioread32(&priv->regs_t->ctrl_rsp_size));
|
|
|
|
if (cmd_pa != rsp_pa) {
|
|
priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size);
|
|
ret = PTR_ERR_OR_ZERO(priv->rsp);
|
|
goto out;
|
|
}
|
|
|
|
/* According to the PTP specification, overlapping command and response
|
|
* buffer sizes must be identical.
|
|
*/
|
|
if (cmd_size != rsp_size) {
|
|
dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
priv->rsp = priv->cmd;
|
|
|
|
out:
|
|
if (!ret)
|
|
priv->cmd_size = cmd_size;
|
|
|
|
crb_go_idle(dev, priv);
|
|
|
|
out_relinquish_locality:
|
|
|
|
__crb_relinquish_locality(dev, priv, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int crb_acpi_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_table_tpm2 *buf;
|
|
struct crb_priv *priv;
|
|
struct tpm_chip *chip;
|
|
struct device *dev = &device->dev;
|
|
struct tpm2_crb_smc *crb_smc;
|
|
acpi_status status;
|
|
u32 sm;
|
|
int rc;
|
|
|
|
status = acpi_get_table(ACPI_SIG_TPM2, 1,
|
|
(struct acpi_table_header **) &buf);
|
|
if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) {
|
|
dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Should the FIFO driver handle this? */
|
|
sm = buf->start_method;
|
|
if (sm == ACPI_TPM2_MEMORY_MAPPED)
|
|
return -ENODEV;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
|
|
if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) {
|
|
dev_err(dev,
|
|
FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
|
|
buf->header.length,
|
|
ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC);
|
|
return -EINVAL;
|
|
}
|
|
crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf));
|
|
priv->smc_func_id = crb_smc->smc_func_id;
|
|
}
|
|
|
|
priv->sm = sm;
|
|
priv->hid = acpi_device_hid(device);
|
|
|
|
rc = crb_map_io(device, priv, buf);
|
|
if (rc)
|
|
return rc;
|
|
|
|
chip = tpmm_chip_alloc(dev, &tpm_crb);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
|
|
dev_set_drvdata(&chip->dev, priv);
|
|
chip->acpi_dev_handle = device->handle;
|
|
chip->flags = TPM_CHIP_FLAG_TPM2;
|
|
|
|
rc = __crb_request_locality(dev, priv, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = crb_cmd_ready(dev, priv);
|
|
if (rc)
|
|
goto out;
|
|
|
|
pm_runtime_get_noresume(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
|
|
rc = tpm_chip_register(chip);
|
|
if (rc) {
|
|
crb_go_idle(dev, priv);
|
|
pm_runtime_put_noidle(dev);
|
|
pm_runtime_disable(dev);
|
|
goto out;
|
|
}
|
|
|
|
pm_runtime_put_sync(dev);
|
|
|
|
out:
|
|
__crb_relinquish_locality(dev, priv, 0);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int crb_acpi_remove(struct acpi_device *device)
|
|
{
|
|
struct device *dev = &device->dev;
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
|
|
tpm_chip_unregister(chip);
|
|
|
|
pm_runtime_disable(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused crb_pm_runtime_suspend(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
|
|
return crb_go_idle(dev, priv);
|
|
}
|
|
|
|
static int __maybe_unused crb_pm_runtime_resume(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
|
|
|
|
return crb_cmd_ready(dev, priv);
|
|
}
|
|
|
|
static int __maybe_unused crb_pm_suspend(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = tpm_pm_suspend(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return crb_pm_runtime_suspend(dev);
|
|
}
|
|
|
|
static int __maybe_unused crb_pm_resume(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = crb_pm_runtime_resume(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return tpm_pm_resume(dev);
|
|
}
|
|
|
|
static const struct dev_pm_ops crb_pm = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(crb_pm_suspend, crb_pm_resume)
|
|
SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL)
|
|
};
|
|
|
|
static const struct acpi_device_id crb_device_ids[] = {
|
|
{"MSFT0101", 0},
|
|
{"", 0},
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, crb_device_ids);
|
|
|
|
static struct acpi_driver crb_acpi_driver = {
|
|
.name = "tpm_crb",
|
|
.ids = crb_device_ids,
|
|
.ops = {
|
|
.add = crb_acpi_add,
|
|
.remove = crb_acpi_remove,
|
|
},
|
|
.drv = {
|
|
.pm = &crb_pm,
|
|
},
|
|
};
|
|
|
|
module_acpi_driver(crb_acpi_driver);
|
|
MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>");
|
|
MODULE_DESCRIPTION("TPM2 Driver");
|
|
MODULE_VERSION("0.1");
|
|
MODULE_LICENSE("GPL");
|