^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * STMicroelectronics TPM Linux driver for TPM ST33ZP24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2009 - 2016 STMicroelectronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/freezer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "../tpm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "st33zp24.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define TPM_ACCESS 0x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define TPM_STS 0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define TPM_DATA_FIFO 0x24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define TPM_INTF_CAPABILITY 0x14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define TPM_INT_STATUS 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define TPM_INT_ENABLE 0x08
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define LOCALITY0 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) enum st33zp24_access {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) TPM_ACCESS_VALID = 0x80,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) TPM_ACCESS_REQUEST_PENDING = 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) TPM_ACCESS_REQUEST_USE = 0x02,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) enum st33zp24_status {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) TPM_STS_VALID = 0x80,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) TPM_STS_COMMAND_READY = 0x40,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) TPM_STS_GO = 0x20,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) TPM_STS_DATA_AVAIL = 0x10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) TPM_STS_DATA_EXPECT = 0x08,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) enum st33zp24_int_flags {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) TPM_GLOBAL_INT_ENABLE = 0x80,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) TPM_INTF_CMD_READY_INT = 0x080,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) TPM_INTF_WAKE_UP_READY_INT = 0x020,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) TPM_INTF_STS_VALID_INT = 0x002,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) TPM_INTF_DATA_AVAIL_INT = 0x001,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) enum tis_defaults {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) TIS_SHORT_TIMEOUT = 750,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) TIS_LONG_TIMEOUT = 2000,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * clear_interruption clear the pending interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * @param: tpm_dev, the tpm device device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * @return: the interrupt status value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static u8 clear_interruption(struct st33zp24_dev *tpm_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) u8 interrupt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) tpm_dev->ops->recv(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_STATUS, &interrupt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return interrupt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) } /* clear_interruption() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * st33zp24_cancel, cancel the current command execution or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * set STS to COMMAND READY.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static void st33zp24_cancel(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) data = TPM_STS_COMMAND_READY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) } /* st33zp24_cancel() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * st33zp24_status return the TPM_STS register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * @param: chip, the tpm chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @return: the TPM_STS register value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static u8 st33zp24_status(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) } /* st33zp24_status() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * check_locality if the locality is active
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * @param: chip, the tpm chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * @return: true if LOCALITY0 is active, otherwise false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static bool check_locality(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) u8 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (status && (data &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) } /* check_locality() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * request_locality request the TPM locality
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * @param: chip, the chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * @return: the active locality or negative value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static int request_locality(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) unsigned long stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (check_locality(chip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return tpm_dev->locality;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) data = TPM_ACCESS_REQUEST_USE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) stop = jiffies + chip->timeout_a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* Request locality is usually effective after the request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (check_locality(chip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return tpm_dev->locality;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) msleep(TPM_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) } while (time_before(jiffies, stop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* could not get locality */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) } /* request_locality() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * release_locality release the active locality
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * @param: chip, the tpm chip description.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static void release_locality(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) data = TPM_ACCESS_ACTIVE_LOCALITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) tpm_dev->ops->send(tpm_dev->phy_id, TPM_ACCESS, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * get_burstcount return the burstcount value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * @param: chip, the chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * return: the burstcount or negative value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static int get_burstcount(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) unsigned long stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int burstcnt, status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) u8 temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) stop = jiffies + chip->timeout_d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) &temp, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (status < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) burstcnt = temp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) status = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_STS + 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) &temp, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (status < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) burstcnt |= temp << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (burstcnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) return burstcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) msleep(TPM_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) } while (time_before(jiffies, stop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) } /* get_burstcount() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * wait_for_tpm_stat_cond
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * @param: chip, chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * @param: mask, expected mask value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * @param: check_cancel, does the command expected to be canceled ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * @param: canceled, did we received a cancel request ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * @return: true if status == mask or if the command is canceled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * false in other cases.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) bool check_cancel, bool *canceled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) u8 status = chip->ops->status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) *canceled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if ((status & mask) == mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (check_cancel && chip->ops->req_canceled(chip, status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) *canceled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * wait_for_stat wait for a TPM_STS value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * @param: chip, the tpm chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * @param: mask, the value mask to wait
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * @param: timeout, the timeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * @param: queue, the wait queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * @param: check_cancel, does the command can be cancelled ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) wait_queue_head_t *queue, bool check_cancel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) unsigned long stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) bool canceled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) bool condition;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) u32 cur_intrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) u8 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* check current status */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) status = st33zp24_status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if ((status & mask) == mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) stop = jiffies + timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (chip->flags & TPM_CHIP_FLAG_IRQ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) cur_intrs = tpm_dev->intrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) clear_interruption(tpm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) enable_irq(tpm_dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (ret == -ERESTARTSYS && freezing(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) clear_thread_flag(TIF_SIGPENDING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) timeout = stop - jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if ((long) timeout <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) ret = wait_event_interruptible_timeout(*queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) cur_intrs != tpm_dev->intrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) clear_interruption(tpm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) condition = wait_for_tpm_stat_cond(chip, mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) check_cancel, &canceled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (ret >= 0 && condition) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (canceled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return -ECANCELED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) } while (ret == -ERESTARTSYS && freezing(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) disable_irq_nosync(tpm_dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) msleep(TPM_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) status = chip->ops->status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if ((status & mask) == mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) } while (time_before(jiffies, stop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) } /* wait_for_stat() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * recv_data receive data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * @param: chip, the tpm chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * @param: buf, the buffer where the data are received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * @param: count, the number of data to receive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * @return: the number of bytes read from TPM FIFO.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) int size = 0, burstcnt, len, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) while (size < count &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) wait_for_stat(chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) TPM_STS_DATA_AVAIL | TPM_STS_VALID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) chip->timeout_c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) &tpm_dev->read_queue, true) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) burstcnt = get_burstcount(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (burstcnt < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return burstcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) len = min_t(int, burstcnt, count - size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) ret = tpm_dev->ops->recv(tpm_dev->phy_id, TPM_DATA_FIFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) buf + size, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) size += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * tpm_ioserirq_handler the serirq irq handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * @param: irq, the tpm chip description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * @param: dev_id, the description of the chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * @return: the status of the handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct tpm_chip *chip = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) tpm_dev->intrs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) wake_up_interruptible(&tpm_dev->read_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) disable_irq_nosync(tpm_dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) } /* tpm_ioserirq_handler() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * st33zp24_send send TPM commands through the I2C bus.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * @param: buf, the buffer to send.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * @param: count, the number of bytes to send.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * @return: In case of success the number of bytes sent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * In other case, a < 0 value describing the issue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) static int st33zp24_send(struct tpm_chip *chip, unsigned char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) u32 status, i, size, ordinal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) int burstcnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (len < TPM_HEADER_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) ret = request_locality(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) status = st33zp24_status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if ((status & TPM_STS_COMMAND_READY) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) st33zp24_cancel(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (wait_for_stat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) (chip, TPM_STS_COMMAND_READY, chip->timeout_b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) &tpm_dev->read_queue, false) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) ret = -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) for (i = 0; i < len - 1;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) burstcnt = get_burstcount(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (burstcnt < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return burstcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) size = min_t(int, len - i - 1, burstcnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) buf + i, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) i += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) status = st33zp24_status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if ((status & TPM_STS_DATA_EXPECT) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_DATA_FIFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) buf + len - 1, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) status = st33zp24_status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if ((status & TPM_STS_DATA_EXPECT) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) data = TPM_STS_GO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_STS, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (chip->flags & TPM_CHIP_FLAG_IRQ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) ret = wait_for_stat(chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) tpm_calc_ordinal_duration(chip, ordinal),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) &tpm_dev->read_queue, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) st33zp24_cancel(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) release_locality(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * st33zp24_recv received TPM response through TPM phy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * @param: buf, the buffer to store datas.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * @param: count, the number of bytes to send.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * @return: In case of success the number of bytes received.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * In other case, a < 0 value describing the issue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) static int st33zp24_recv(struct tpm_chip *chip, unsigned char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) int size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) u32 expected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (count < TPM_HEADER_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) size = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) size = recv_data(chip, buf, TPM_HEADER_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (size < TPM_HEADER_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) dev_err(&chip->dev, "Unable to read header\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) expected = be32_to_cpu(*(__be32 *)(buf + 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (expected > count || expected < TPM_HEADER_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) size = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) size += recv_data(chip, &buf[TPM_HEADER_SIZE],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) expected - TPM_HEADER_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (size < expected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) dev_err(&chip->dev, "Unable to read remainder of result\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) size = -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) st33zp24_cancel(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) release_locality(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * st33zp24_req_canceled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * @param: status, the TPM status.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * @return: Does TPM ready to compute a new command ? true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) static bool st33zp24_req_canceled(struct tpm_chip *chip, u8 status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return (status == TPM_STS_COMMAND_READY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static const struct tpm_class_ops st33zp24_tpm = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) .flags = TPM_OPS_AUTO_STARTUP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) .send = st33zp24_send,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) .recv = st33zp24_recv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) .cancel = st33zp24_cancel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) .status = st33zp24_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) .req_canceled = st33zp24_req_canceled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * st33zp24_probe initialize the TPM device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * @param: client, the i2c_client description (TPM I2C description).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) * @param: id, the i2c_device_id struct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * @return: 0 in case of success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * -1 in other case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) int st33zp24_probe(void *phy_id, const struct st33zp24_phy_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct device *dev, int irq, int io_lpcpd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) u8 intmask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) struct tpm_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) struct st33zp24_dev *tpm_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) chip = tpmm_chip_alloc(dev, &st33zp24_tpm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (IS_ERR(chip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) return PTR_ERR(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) tpm_dev = devm_kzalloc(dev, sizeof(struct st33zp24_dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (!tpm_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) tpm_dev->phy_id = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) tpm_dev->ops = ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) dev_set_drvdata(&chip->dev, tpm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) tpm_dev->locality = LOCALITY0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) /* INTERRUPT Setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) init_waitqueue_head(&tpm_dev->read_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) tpm_dev->intrs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (request_locality(chip) != LOCALITY0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) goto _tpm_clean_answer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) clear_interruption(tpm_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) ret = devm_request_irq(dev, irq, tpm_ioserirq_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) IRQF_TRIGGER_HIGH, "TPM SERIRQ management",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) dev_err(&chip->dev, "TPM SERIRQ signals %d not available\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) goto _tpm_clean_answer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) intmask |= TPM_INTF_CMD_READY_INT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) | TPM_INTF_STS_VALID_INT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) | TPM_INTF_DATA_AVAIL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) ret = tpm_dev->ops->send(tpm_dev->phy_id, TPM_INT_ENABLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) &intmask, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) goto _tpm_clean_answer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) intmask = TPM_GLOBAL_INT_ENABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) ret = tpm_dev->ops->send(tpm_dev->phy_id, (TPM_INT_ENABLE + 3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) &intmask, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) goto _tpm_clean_answer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) tpm_dev->irq = irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) chip->flags |= TPM_CHIP_FLAG_IRQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) disable_irq_nosync(tpm_dev->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) return tpm_chip_register(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) _tpm_clean_answer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) dev_info(&chip->dev, "TPM initialization fail\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) EXPORT_SYMBOL(st33zp24_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) * st33zp24_remove remove the TPM device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * @param: tpm_data, the tpm phy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * @return: 0 in case of success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) int st33zp24_remove(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) tpm_chip_unregister(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) EXPORT_SYMBOL(st33zp24_remove);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) * st33zp24_pm_suspend suspend the TPM device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) * @param: tpm_data, the tpm phy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) * @param: mesg, the power management message.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) * @return: 0 in case of success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) int st33zp24_pm_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) struct tpm_chip *chip = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (gpio_is_valid(tpm_dev->io_lpcpd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) gpio_set_value(tpm_dev->io_lpcpd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) ret = tpm_pm_suspend(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) } /* st33zp24_pm_suspend() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) EXPORT_SYMBOL(st33zp24_pm_suspend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * st33zp24_pm_resume resume the TPM device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * @param: tpm_data, the tpm phy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * @return: 0 in case of success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) int st33zp24_pm_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) struct tpm_chip *chip = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (gpio_is_valid(tpm_dev->io_lpcpd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) gpio_set_value(tpm_dev->io_lpcpd, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) ret = wait_for_stat(chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) TPM_STS_VALID, chip->timeout_b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) &tpm_dev->read_queue, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) ret = tpm_pm_resume(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) tpm1_do_selftest(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) } /* st33zp24_pm_resume() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) EXPORT_SYMBOL(st33zp24_pm_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) MODULE_DESCRIPTION("ST33ZP24 TPM 1.2 driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) MODULE_VERSION("1.3.0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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