2019-10-07 23:48:46 +08:00
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Mellanox boot control driver
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*
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* This driver provides a sysfs interface for systems management
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* software to manage reset-time actions.
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*
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* Copyright (C) 2019 Mellanox Technologies
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*/
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#include <linux/acpi.h>
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#include <linux/arm-smccc.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include "mlxbf-bootctl.h"
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#define MLXBF_BOOTCTL_SB_SECURE_MASK 0x03
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#define MLXBF_BOOTCTL_SB_TEST_MASK 0x0c
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#define MLXBF_SB_KEY_NUM 4
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/* UUID used to probe ATF service. */
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static const char *mlxbf_bootctl_svc_uuid_str =
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"89c036b4-e7d7-11e6-8797-001aca00bfc4";
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struct mlxbf_bootctl_name {
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u32 value;
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const char *name;
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};
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static struct mlxbf_bootctl_name boot_names[] = {
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{ MLXBF_BOOTCTL_EXTERNAL, "external" },
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{ MLXBF_BOOTCTL_EMMC, "emmc" },
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{ MLNX_BOOTCTL_SWAP_EMMC, "swap_emmc" },
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{ MLXBF_BOOTCTL_EMMC_LEGACY, "emmc_legacy" },
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{ MLXBF_BOOTCTL_NONE, "none" },
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};
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static const char * const mlxbf_bootctl_lifecycle_states[] = {
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[0] = "Production",
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[1] = "GA Secured",
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[2] = "GA Non-Secured",
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[3] = "RMA",
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};
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/* ARM SMC call which is atomic and no need for lock. */
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static int mlxbf_bootctl_smc(unsigned int smc_op, int smc_arg)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(smc_op, smc_arg, 0, 0, 0, 0, 0, 0, &res);
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return res.a0;
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}
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/* Return the action in integer or an error code. */
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static int mlxbf_bootctl_reset_action_to_val(const char *action)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(boot_names); i++)
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if (sysfs_streq(boot_names[i].name, action))
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return boot_names[i].value;
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return -EINVAL;
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}
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/* Return the action in string. */
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static const char *mlxbf_bootctl_action_to_string(int action)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(boot_names); i++)
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if (boot_names[i].value == action)
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return boot_names[i].name;
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return "invalid action";
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}
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static ssize_t post_reset_wdog_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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ret = mlxbf_bootctl_smc(MLXBF_BOOTCTL_GET_POST_RESET_WDOG, 0);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", ret);
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}
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static ssize_t post_reset_wdog_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned long value;
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int ret;
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ret = kstrtoul(buf, 10, &value);
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if (ret)
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return ret;
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ret = mlxbf_bootctl_smc(MLXBF_BOOTCTL_SET_POST_RESET_WDOG, value);
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if (ret < 0)
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return ret;
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return count;
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}
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static ssize_t mlxbf_bootctl_show(int smc_op, char *buf)
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{
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int action;
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action = mlxbf_bootctl_smc(smc_op, 0);
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if (action < 0)
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return action;
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return sprintf(buf, "%s\n", mlxbf_bootctl_action_to_string(action));
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}
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static int mlxbf_bootctl_store(int smc_op, const char *buf, size_t count)
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{
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int ret, action;
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action = mlxbf_bootctl_reset_action_to_val(buf);
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if (action < 0)
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return action;
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ret = mlxbf_bootctl_smc(smc_op, action);
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if (ret < 0)
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return ret;
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return count;
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}
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static ssize_t reset_action_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return mlxbf_bootctl_show(MLXBF_BOOTCTL_GET_RESET_ACTION, buf);
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}
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static ssize_t reset_action_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return mlxbf_bootctl_store(MLXBF_BOOTCTL_SET_RESET_ACTION, buf, count);
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}
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static ssize_t second_reset_action_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return mlxbf_bootctl_show(MLXBF_BOOTCTL_GET_SECOND_RESET_ACTION, buf);
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}
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static ssize_t second_reset_action_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return mlxbf_bootctl_store(MLXBF_BOOTCTL_SET_SECOND_RESET_ACTION, buf,
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count);
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}
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static ssize_t lifecycle_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int lc_state;
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lc_state = mlxbf_bootctl_smc(MLXBF_BOOTCTL_GET_TBB_FUSE_STATUS,
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MLXBF_BOOTCTL_FUSE_STATUS_LIFECYCLE);
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if (lc_state < 0)
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return lc_state;
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lc_state &=
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MLXBF_BOOTCTL_SB_TEST_MASK | MLXBF_BOOTCTL_SB_SECURE_MASK;
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/*
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* If the test bits are set, we specify that the current state may be
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* due to using the test bits.
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*/
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if (lc_state & MLXBF_BOOTCTL_SB_TEST_MASK) {
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lc_state &= MLXBF_BOOTCTL_SB_SECURE_MASK;
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return sprintf(buf, "%s(test)\n",
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mlxbf_bootctl_lifecycle_states[lc_state]);
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}
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return sprintf(buf, "%s\n", mlxbf_bootctl_lifecycle_states[lc_state]);
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}
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static ssize_t secure_boot_fuse_state_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int burnt, valid, key, key_state, buf_len = 0, upper_key_used = 0;
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const char *status;
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key_state = mlxbf_bootctl_smc(MLXBF_BOOTCTL_GET_TBB_FUSE_STATUS,
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MLXBF_BOOTCTL_FUSE_STATUS_KEYS);
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if (key_state < 0)
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return key_state;
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/*
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* key_state contains the bits for 4 Key versions, loaded from eFuses
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* after a hard reset. Lower 4 bits are a thermometer code indicating
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* key programming has started for key n (0000 = none, 0001 = version 0,
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* 0011 = version 1, 0111 = version 2, 1111 = version 3). Upper 4 bits
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* are a thermometer code indicating key programming has completed for
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* key n (same encodings as the start bits). This allows for detection
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2021-03-17 17:56:50 +08:00
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* of an interruption in the programming process which has left the key
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2019-10-07 23:48:46 +08:00
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* partially programmed (and thus invalid). The process is to burn the
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* eFuse for the new key start bit, burn the key eFuses, then burn the
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* eFuse for the new key complete bit.
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*
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* For example 0000_0000: no key valid, 0001_0001: key version 0 valid,
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* 0011_0011: key 1 version valid, 0011_0111: key version 2 started
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* programming but did not complete, etc. The most recent key for which
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* both start and complete bit is set is loaded. On soft reset, this
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* register is not modified.
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*/
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for (key = MLXBF_SB_KEY_NUM - 1; key >= 0; key--) {
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burnt = key_state & BIT(key);
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valid = key_state & BIT(key + MLXBF_SB_KEY_NUM);
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if (burnt && valid)
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upper_key_used = 1;
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if (upper_key_used) {
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if (burnt)
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status = valid ? "Used" : "Wasted";
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else
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status = valid ? "Invalid" : "Skipped";
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} else {
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if (burnt)
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status = valid ? "InUse" : "Incomplete";
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else
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status = valid ? "Invalid" : "Free";
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}
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buf_len += sprintf(buf + buf_len, "%d:%s ", key, status);
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}
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buf_len += sprintf(buf + buf_len, "\n");
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return buf_len;
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}
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static DEVICE_ATTR_RW(post_reset_wdog);
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static DEVICE_ATTR_RW(reset_action);
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static DEVICE_ATTR_RW(second_reset_action);
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static DEVICE_ATTR_RO(lifecycle_state);
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static DEVICE_ATTR_RO(secure_boot_fuse_state);
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static struct attribute *mlxbf_bootctl_attrs[] = {
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&dev_attr_post_reset_wdog.attr,
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&dev_attr_reset_action.attr,
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&dev_attr_second_reset_action.attr,
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&dev_attr_lifecycle_state.attr,
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&dev_attr_secure_boot_fuse_state.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(mlxbf_bootctl);
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static const struct acpi_device_id mlxbf_bootctl_acpi_ids[] = {
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{"MLNXBF04", 0},
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{}
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};
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MODULE_DEVICE_TABLE(acpi, mlxbf_bootctl_acpi_ids);
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static bool mlxbf_bootctl_guid_match(const guid_t *guid,
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const struct arm_smccc_res *res)
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{
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guid_t id = GUID_INIT(res->a0, res->a1, res->a1 >> 16,
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res->a2, res->a2 >> 8, res->a2 >> 16,
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res->a2 >> 24, res->a3, res->a3 >> 8,
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res->a3 >> 16, res->a3 >> 24);
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return guid_equal(guid, &id);
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}
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static int mlxbf_bootctl_probe(struct platform_device *pdev)
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{
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struct arm_smccc_res res = { 0 };
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guid_t guid;
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int ret;
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/* Ensure we have the UUID we expect for this service. */
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arm_smccc_smc(MLXBF_BOOTCTL_SIP_SVC_UID, 0, 0, 0, 0, 0, 0, 0, &res);
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guid_parse(mlxbf_bootctl_svc_uuid_str, &guid);
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if (!mlxbf_bootctl_guid_match(&guid, &res))
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return -ENODEV;
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/*
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* When watchdog is used, it sets boot mode to MLXBF_BOOTCTL_SWAP_EMMC
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* in case of boot failures. However it doesn't clear the state if there
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* is no failure. Restore the default boot mode here to avoid any
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* unnecessary boot partition swapping.
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*/
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ret = mlxbf_bootctl_smc(MLXBF_BOOTCTL_SET_RESET_ACTION,
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MLXBF_BOOTCTL_EMMC);
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if (ret < 0)
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dev_warn(&pdev->dev, "Unable to reset the EMMC boot mode\n");
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return 0;
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}
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static struct platform_driver mlxbf_bootctl_driver = {
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.probe = mlxbf_bootctl_probe,
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.driver = {
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.name = "mlxbf-bootctl",
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2019-12-19 02:35:27 +08:00
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.dev_groups = mlxbf_bootctl_groups,
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2019-10-07 23:48:46 +08:00
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.acpi_match_table = mlxbf_bootctl_acpi_ids,
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}
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};
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module_platform_driver(mlxbf_bootctl_driver);
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MODULE_DESCRIPTION("Mellanox boot control driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Mellanox Technologies");
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