Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (c) 2012-2019, Intel Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Intel Management Engine Interface (Intel MEI) Linux driver
^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/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/wait.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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "mei_dev.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "hbm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "client.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) const char *mei_dev_state_str(int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	MEI_DEV_STATE(INITIALIZING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	MEI_DEV_STATE(INIT_CLIENTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	MEI_DEV_STATE(ENABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	MEI_DEV_STATE(RESETTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	MEI_DEV_STATE(DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	MEI_DEV_STATE(POWER_DOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	MEI_DEV_STATE(POWER_UP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		return "unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #undef MEI_DEV_STATE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) const char *mei_pg_state_str(enum mei_pg_state state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define MEI_PG_STATE(state) case MEI_PG_##state: return #state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	MEI_PG_STATE(OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	MEI_PG_STATE(ON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		return "unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #undef MEI_PG_STATE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^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)  * mei_fw_status2str - convert fw status registers to printable string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * @fw_status:  firmware status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * Return: number of bytes written or -EINVAL if buffer is to small
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) ssize_t mei_fw_status2str(struct mei_fw_status *fw_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 			  char *buf, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	ssize_t cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	buf[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (len < MEI_FW_STATUS_STR_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	for (i = 0; i < fw_status->count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		cnt += scnprintf(buf + cnt, len - cnt, "%08X ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 				fw_status->status[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* drop last space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	buf[cnt] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) EXPORT_SYMBOL_GPL(mei_fw_status2str);
^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)  * mei_cancel_work - Cancel mei background jobs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) void mei_cancel_work(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	cancel_work_sync(&dev->reset_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	cancel_work_sync(&dev->bus_rescan_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	cancel_delayed_work_sync(&dev->timer_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) EXPORT_SYMBOL_GPL(mei_cancel_work);
^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)  * mei_reset - resets host and fw.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * Return: 0 on success or < 0 if the reset hasn't succeeded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) int mei_reset(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	enum mei_dev_state state = dev->dev_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	bool interrupts_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (state != MEI_DEV_INITIALIZING &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	    state != MEI_DEV_DISABLED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	    state != MEI_DEV_POWER_DOWN &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	    state != MEI_DEV_POWER_UP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		char fw_sts_str[MEI_FW_STATUS_STR_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		mei_fw_status_str(dev, fw_sts_str, MEI_FW_STATUS_STR_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		dev_warn(dev->dev, "unexpected reset: dev_state = %s fw status = %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			 mei_dev_state_str(state), fw_sts_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	mei_clear_interrupts(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	/* we're already in reset, cancel the init timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	 * if the reset was called due the hbm protocol error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	 * we need to call it before hw start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	 * so the hbm watchdog won't kick in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	mei_hbm_idle(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	/* enter reset flow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	interrupts_enabled = state != MEI_DEV_POWER_DOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	mei_set_devstate(dev, MEI_DEV_RESETTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	dev->reset_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		dev_err(dev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		mei_set_devstate(dev, MEI_DEV_DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	ret = mei_hw_reset(dev, interrupts_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	/* fall through and remove the sw state even if hw reset has failed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	/* no need to clean up software state in case of power up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	if (state != MEI_DEV_INITIALIZING && state != MEI_DEV_POWER_UP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		mei_cl_all_disconnect(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	mei_hbm_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		dev_err(dev->dev, "hw_reset failed ret = %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (state == MEI_DEV_POWER_DOWN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		dev_dbg(dev->dev, "powering down: end of reset\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		mei_set_devstate(dev, MEI_DEV_DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	ret = mei_hw_start(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		dev_err(dev->dev, "hw_start failed ret = %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	dev_dbg(dev->dev, "link is established start sending messages.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	mei_set_devstate(dev, MEI_DEV_INIT_CLIENTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	ret = mei_hbm_start_req(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		dev_err(dev->dev, "hbm_start failed ret = %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		mei_set_devstate(dev, MEI_DEV_RESETTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		return ret;
^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) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) EXPORT_SYMBOL_GPL(mei_reset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * mei_start - initializes host and fw to start work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * Return: 0 on success, <0 on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int mei_start(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	mutex_lock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/* acknowledge interrupt and stop interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	mei_clear_interrupts(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	ret = mei_hw_config(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	dev_dbg(dev->dev, "reset in start the mei device.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	dev->reset_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		mei_set_devstate(dev, MEI_DEV_INITIALIZING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		ret = mei_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		if (ret == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			dev_err(dev->dev, "reset failed ret = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	} while (ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (mei_hbm_start_wait(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		dev_err(dev->dev, "HBM haven't started");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (!mei_host_is_ready(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		dev_err(dev->dev, "host is not ready.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (!mei_hw_is_ready(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		dev_err(dev->dev, "ME is not ready.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (!mei_hbm_version_is_supported(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		dev_dbg(dev->dev, "MEI start failed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		goto err;
^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) 	dev_dbg(dev->dev, "link layer has been established.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	dev_err(dev->dev, "link layer initialization failed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	mei_set_devstate(dev, MEI_DEV_DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) EXPORT_SYMBOL_GPL(mei_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  * mei_restart - restart device after suspend
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * Return: 0 on success or -ENODEV if the restart hasn't succeeded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) int mei_restart(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	mutex_lock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	mei_set_devstate(dev, MEI_DEV_POWER_UP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	dev->reset_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	err = mei_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (err == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		dev_err(dev->dev, "device disabled = %d\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	/* try to start again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		schedule_work(&dev->reset_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) EXPORT_SYMBOL_GPL(mei_restart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static void mei_reset_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct mei_device *dev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		container_of(work, struct mei_device,  reset_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	mei_clear_interrupts(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	mei_synchronize_irq(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	mutex_lock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	ret = mei_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (dev->dev_state == MEI_DEV_DISABLED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		dev_err(dev->dev, "device disabled = %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	/* retry reset in case of failure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		schedule_work(&dev->reset_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) void mei_stop(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	dev_dbg(dev->dev, "stopping the device.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	mutex_lock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	mei_cl_bus_remove_devices(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	mei_cancel_work(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	mei_clear_interrupts(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	mei_synchronize_irq(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	mutex_lock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	mei_reset(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	/* move device to disabled state unconditionally */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	mei_set_devstate(dev, MEI_DEV_DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	mutex_unlock(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) EXPORT_SYMBOL_GPL(mei_stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  * mei_write_is_idle - check if the write queues are idle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)  * @dev: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)  * Return: true of there is no pending write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) bool mei_write_is_idle(struct mei_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		list_empty(&dev->ctrl_wr_list) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		list_empty(&dev->write_list)   &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		list_empty(&dev->write_waiting_list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%01d write=%01d wwait=%01d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		idle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		mei_dev_state_str(dev->dev_state),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		list_empty(&dev->ctrl_wr_list),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		list_empty(&dev->write_list),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		list_empty(&dev->write_waiting_list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	return idle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) EXPORT_SYMBOL_GPL(mei_write_is_idle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)  * mei_device_init  -- initialize mei_device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)  * @dev: the mei device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)  * @device: the device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)  * @hw_ops: hw operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) void mei_device_init(struct mei_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		     struct device *device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		     const struct mei_hw_ops *hw_ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	/* setup our list array */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	INIT_LIST_HEAD(&dev->file_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	INIT_LIST_HEAD(&dev->device_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	INIT_LIST_HEAD(&dev->me_clients);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	mutex_init(&dev->device_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	init_rwsem(&dev->me_clients_rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	mutex_init(&dev->cl_bus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	init_waitqueue_head(&dev->wait_hw_ready);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	init_waitqueue_head(&dev->wait_pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	init_waitqueue_head(&dev->wait_hbm_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	dev->dev_state = MEI_DEV_INITIALIZING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	dev->reset_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	INIT_LIST_HEAD(&dev->write_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	INIT_LIST_HEAD(&dev->write_waiting_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	INIT_LIST_HEAD(&dev->ctrl_wr_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	INIT_LIST_HEAD(&dev->ctrl_rd_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	dev->tx_queue_limit = MEI_TX_QUEUE_LIMIT_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	INIT_WORK(&dev->reset_work, mei_reset_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	INIT_WORK(&dev->bus_rescan_work, mei_cl_bus_rescan_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	dev->open_handle_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	 * Reserving the first client ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	 * 0: Reserved for MEI Bus Message communications
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	bitmap_set(dev->host_clients_map, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	dev->pg_event = MEI_PG_EVENT_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	dev->ops      = hw_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	dev->dev      = device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) EXPORT_SYMBOL_GPL(mei_device_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)