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linux-sg2042/drivers/hid/intel-ish-hid/ipc/ipc.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* H/W layer of ISHTP provider device (ISH)
*
* Copyright (c) 2014-2016, Intel Corporation.
*/
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include "client.h"
#include "hw-ish.h"
#include "hbm.h"
/* For FW reset flow */
static struct work_struct fw_reset_work;
static struct ishtp_device *ishtp_dev;
/**
* ish_reg_read() - Read register
* @dev: ISHTP device pointer
* @offset: Register offset
*
* Read 32 bit register at a given offset
*
* Return: Read register value
*/
static inline uint32_t ish_reg_read(const struct ishtp_device *dev,
unsigned long offset)
{
struct ish_hw *hw = to_ish_hw(dev);
return readl(hw->mem_addr + offset);
}
/**
* ish_reg_write() - Write register
* @dev: ISHTP device pointer
* @offset: Register offset
* @value: Value to write
*
* Writes 32 bit register at a give offset
*/
static inline void ish_reg_write(struct ishtp_device *dev,
unsigned long offset,
uint32_t value)
{
struct ish_hw *hw = to_ish_hw(dev);
writel(value, hw->mem_addr + offset);
}
/**
* _ish_read_fw_sts_reg() - Read FW status register
* @dev: ISHTP device pointer
*
* Read FW status register
*
* Return: Read register value
*/
static inline uint32_t _ish_read_fw_sts_reg(struct ishtp_device *dev)
{
return ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
}
/**
* check_generated_interrupt() - Check if ISH interrupt
* @dev: ISHTP device pointer
*
* Check if an interrupt was generated for ISH
*
* Return: Read true or false
*/
static bool check_generated_interrupt(struct ishtp_device *dev)
{
bool interrupt_generated = true;
uint32_t pisr_val = 0;
if (dev->pdev->device == CHV_DEVICE_ID) {
pisr_val = ish_reg_read(dev, IPC_REG_PISR_CHV_AB);
interrupt_generated =
IPC_INT_FROM_ISH_TO_HOST_CHV_AB(pisr_val);
} else {
pisr_val = ish_reg_read(dev, IPC_REG_PISR_BXT);
interrupt_generated = !!pisr_val;
/* only busy-clear bit is RW, others are RO */
if (pisr_val)
ish_reg_write(dev, IPC_REG_PISR_BXT, pisr_val);
}
return interrupt_generated;
}
/**
* ish_is_input_ready() - Check if FW ready for RX
* @dev: ISHTP device pointer
*
* Check if ISH FW is ready for receiving data
*
* Return: Read true or false
*/
static bool ish_is_input_ready(struct ishtp_device *dev)
{
uint32_t doorbell_val;
doorbell_val = ish_reg_read(dev, IPC_REG_HOST2ISH_DRBL);
return !IPC_IS_BUSY(doorbell_val);
}
/**
* set_host_ready() - Indicate host ready
* @dev: ISHTP device pointer
*
* Set host ready indication to FW
*/
static void set_host_ready(struct ishtp_device *dev)
{
if (dev->pdev->device == CHV_DEVICE_ID) {
if (dev->pdev->revision == REVISION_ID_CHT_A0 ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Ax_SI)
ish_reg_write(dev, IPC_REG_HOST_COMM, 0x81);
else if (dev->pdev->revision == REVISION_ID_CHT_B0 ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Bx_SI ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Kx_SI ||
(dev->pdev->revision & REVISION_ID_SI_MASK) ==
REVISION_ID_CHT_Dx_SI) {
uint32_t host_comm_val;
host_comm_val = ish_reg_read(dev, IPC_REG_HOST_COMM);
host_comm_val |= IPC_HOSTCOMM_INT_EN_BIT_CHV_AB | 0x81;
ish_reg_write(dev, IPC_REG_HOST_COMM, host_comm_val);
}
} else {
uint32_t host_pimr_val;
host_pimr_val = ish_reg_read(dev, IPC_REG_PIMR_BXT);
host_pimr_val |= IPC_PIMR_INT_EN_BIT_BXT;
/*
* disable interrupt generated instead of
* RX_complete_msg
*/
host_pimr_val &= ~IPC_HOST2ISH_BUSYCLEAR_MASK_BIT;
ish_reg_write(dev, IPC_REG_PIMR_BXT, host_pimr_val);
}
}
/**
* ishtp_fw_is_ready() - Check if FW ready
* @dev: ISHTP device pointer
*
* Check if ISH FW is ready
*
* Return: Read true or false
*/
static bool ishtp_fw_is_ready(struct ishtp_device *dev)
{
uint32_t ish_status = _ish_read_fw_sts_reg(dev);
return IPC_IS_ISH_ILUP(ish_status) &&
IPC_IS_ISH_ISHTP_READY(ish_status);
}
/**
* ish_set_host_rdy() - Indicate host ready
* @dev: ISHTP device pointer
*
* Set host ready indication to FW
*/
static void ish_set_host_rdy(struct ishtp_device *dev)
{
uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM);
IPC_SET_HOST_READY(host_status);
ish_reg_write(dev, IPC_REG_HOST_COMM, host_status);
}
/**
* ish_clr_host_rdy() - Indicate host not ready
* @dev: ISHTP device pointer
*
* Send host not ready indication to FW
*/
static void ish_clr_host_rdy(struct ishtp_device *dev)
{
uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM);
IPC_CLEAR_HOST_READY(host_status);
ish_reg_write(dev, IPC_REG_HOST_COMM, host_status);
}
/**
* _ishtp_read_hdr() - Read message header
* @dev: ISHTP device pointer
*
* Read header of 32bit length
*
* Return: Read register value
*/
static uint32_t _ishtp_read_hdr(const struct ishtp_device *dev)
{
return ish_reg_read(dev, IPC_REG_ISH2HOST_MSG);
}
/**
* _ishtp_read - Read message
* @dev: ISHTP device pointer
* @buffer: message buffer
* @buffer_length: length of message buffer
*
* Read message from FW
*
* Return: Always 0
*/
static int _ishtp_read(struct ishtp_device *dev, unsigned char *buffer,
unsigned long buffer_length)
{
uint32_t i;
uint32_t *r_buf = (uint32_t *)buffer;
uint32_t msg_offs;
msg_offs = IPC_REG_ISH2HOST_MSG + sizeof(struct ishtp_msg_hdr);
for (i = 0; i < buffer_length; i += sizeof(uint32_t))
*r_buf++ = ish_reg_read(dev, msg_offs + i);
return 0;
}
/**
* write_ipc_from_queue() - try to write ipc msg from Tx queue to device
* @dev: ishtp device pointer
*
* Check if DRBL is cleared. if it is - write the first IPC msg, then call
* the callback function (unless it's NULL)
*
* Return: 0 for success else failure code
*/
static int write_ipc_from_queue(struct ishtp_device *dev)
{
struct wr_msg_ctl_info *ipc_link;
unsigned long length;
unsigned long rem;
unsigned long flags;
uint32_t doorbell_val;
uint32_t *r_buf;
uint32_t reg_addr;
int i;
void (*ipc_send_compl)(void *);
void *ipc_send_compl_prm;
if (dev->dev_state == ISHTP_DEV_DISABLED)
return -EINVAL;
spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
if (!ish_is_input_ready(dev)) {
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
return -EBUSY;
}
/*
* if tx send list is empty - return 0;
* may happen, as RX_COMPLETE handler doesn't check list emptiness.
*/
if (list_empty(&dev->wr_processing_list)) {
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
return 0;
}
ipc_link = list_first_entry(&dev->wr_processing_list,
struct wr_msg_ctl_info, link);
/* first 4 bytes of the data is the doorbell value (IPC header) */
length = ipc_link->length - sizeof(uint32_t);
doorbell_val = *(uint32_t *)ipc_link->inline_data;
r_buf = (uint32_t *)(ipc_link->inline_data + sizeof(uint32_t));
/* If sending MNG_SYNC_FW_CLOCK, update clock again */
if (IPC_HEADER_GET_PROTOCOL(doorbell_val) == IPC_PROTOCOL_MNG &&
IPC_HEADER_GET_MNG_CMD(doorbell_val) == MNG_SYNC_FW_CLOCK) {
uint64_t usec_system, usec_utc;
struct ipc_time_update_msg time_update;
struct time_sync_format ts_format;
usec_system = ktime_to_us(ktime_get_boottime());
usec_utc = ktime_to_us(ktime_get_real());
ts_format.ts1_source = HOST_SYSTEM_TIME_USEC;
ts_format.ts2_source = HOST_UTC_TIME_USEC;
ts_format.reserved = 0;
time_update.primary_host_time = usec_system;
time_update.secondary_host_time = usec_utc;
time_update.sync_info = ts_format;
memcpy(r_buf, &time_update,
sizeof(struct ipc_time_update_msg));
}
for (i = 0, reg_addr = IPC_REG_HOST2ISH_MSG; i < length >> 2; i++,
reg_addr += 4)
ish_reg_write(dev, reg_addr, r_buf[i]);
rem = length & 0x3;
if (rem > 0) {
uint32_t reg = 0;
memcpy(&reg, &r_buf[length >> 2], rem);
ish_reg_write(dev, reg_addr, reg);
}
ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, doorbell_val);
/* Flush writes to msg registers and doorbell */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
/* Update IPC counters */
++dev->ipc_tx_cnt;
dev->ipc_tx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);
ipc_send_compl = ipc_link->ipc_send_compl;
ipc_send_compl_prm = ipc_link->ipc_send_compl_prm;
list_del_init(&ipc_link->link);
list_add(&ipc_link->link, &dev->wr_free_list);
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
/*
* callback will be called out of spinlock,
* after ipc_link returned to free list
*/
if (ipc_send_compl)
ipc_send_compl(ipc_send_compl_prm);
return 0;
}
/**
* write_ipc_to_queue() - write ipc msg to Tx queue
* @dev: ishtp device instance
* @ipc_send_compl: Send complete callback
* @ipc_send_compl_prm: Parameter to send in complete callback
* @msg: Pointer to message
* @length: Length of message
*
* Recived msg with IPC (and upper protocol) header and add it to the device
* Tx-to-write list then try to send the first IPC waiting msg
* (if DRBL is cleared)
* This function returns negative value for failure (means free list
* is empty, or msg too long) and 0 for success.
*
* Return: 0 for success else failure code
*/
static int write_ipc_to_queue(struct ishtp_device *dev,
void (*ipc_send_compl)(void *), void *ipc_send_compl_prm,
unsigned char *msg, int length)
{
struct wr_msg_ctl_info *ipc_link;
unsigned long flags;
if (length > IPC_FULL_MSG_SIZE)
return -EMSGSIZE;
spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
if (list_empty(&dev->wr_free_list)) {
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
return -ENOMEM;
}
ipc_link = list_first_entry(&dev->wr_free_list,
struct wr_msg_ctl_info, link);
list_del_init(&ipc_link->link);
ipc_link->ipc_send_compl = ipc_send_compl;
ipc_link->ipc_send_compl_prm = ipc_send_compl_prm;
ipc_link->length = length;
memcpy(ipc_link->inline_data, msg, length);
list_add_tail(&ipc_link->link, &dev->wr_processing_list);
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
write_ipc_from_queue(dev);
return 0;
}
/**
* ipc_send_mng_msg() - Send management message
* @dev: ishtp device instance
* @msg_code: Message code
* @msg: Pointer to message
* @size: Length of message
*
* Send management message to FW
*
* Return: 0 for success else failure code
*/
static int ipc_send_mng_msg(struct ishtp_device *dev, uint32_t msg_code,
void *msg, size_t size)
{
unsigned char ipc_msg[IPC_FULL_MSG_SIZE];
uint32_t drbl_val = IPC_BUILD_MNG_MSG(msg_code, size);
memcpy(ipc_msg, &drbl_val, sizeof(uint32_t));
memcpy(ipc_msg + sizeof(uint32_t), msg, size);
return write_ipc_to_queue(dev, NULL, NULL, ipc_msg,
sizeof(uint32_t) + size);
}
#define WAIT_FOR_FW_RDY 0x1
#define WAIT_FOR_INPUT_RDY 0x2
/**
* timed_wait_for_timeout() - wait special event with timeout
* @dev: ISHTP device pointer
* @condition: indicate the condition for waiting
* @timeinc: time slice for every wait cycle, in ms
* @timeout: time in ms for timeout
*
* This function will check special event to be ready in a loop, the loop
* period is specificd in timeinc. Wait timeout will causes failure.
*
* Return: 0 for success else failure code
*/
static int timed_wait_for_timeout(struct ishtp_device *dev, int condition,
unsigned int timeinc, unsigned int timeout)
{
bool complete = false;
int ret;
do {
if (condition == WAIT_FOR_FW_RDY) {
complete = ishtp_fw_is_ready(dev);
} else if (condition == WAIT_FOR_INPUT_RDY) {
complete = ish_is_input_ready(dev);
} else {
ret = -EINVAL;
goto out;
}
if (!complete) {
unsigned long left_time;
left_time = msleep_interruptible(timeinc);
timeout -= (timeinc - left_time);
}
} while (!complete && timeout > 0);
if (complete)
ret = 0;
else
ret = -EBUSY;
out:
return ret;
}
#define TIME_SLICE_FOR_FW_RDY_MS 100
#define TIME_SLICE_FOR_INPUT_RDY_MS 100
#define TIMEOUT_FOR_FW_RDY_MS 2000
#define TIMEOUT_FOR_INPUT_RDY_MS 2000
/**
* ish_fw_reset_handler() - FW reset handler
* @dev: ishtp device pointer
*
* Handle FW reset
*
* Return: 0 for success else failure code
*/
static int ish_fw_reset_handler(struct ishtp_device *dev)
{
uint32_t reset_id;
unsigned long flags;
/* Read reset ID */
reset_id = ish_reg_read(dev, IPC_REG_ISH2HOST_MSG) & 0xFFFF;
/* Clear IPC output queue */
spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
list_splice_init(&dev->wr_processing_list, &dev->wr_free_list);
spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
/* ISHTP notification in IPC_RESET */
ishtp_reset_handler(dev);
if (!ish_is_input_ready(dev))
timed_wait_for_timeout(dev, WAIT_FOR_INPUT_RDY,
TIME_SLICE_FOR_INPUT_RDY_MS, TIMEOUT_FOR_INPUT_RDY_MS);
/* ISH FW is dead */
if (!ish_is_input_ready(dev))
return -EPIPE;
/*
* Set HOST2ISH.ILUP. Apparently we need this BEFORE sending
* RESET_NOTIFY_ACK - FW will be checking for it
*/
ish_set_host_rdy(dev);
/* Send RESET_NOTIFY_ACK (with reset_id) */
ipc_send_mng_msg(dev, MNG_RESET_NOTIFY_ACK, &reset_id,
sizeof(uint32_t));
/* Wait for ISH FW'es ILUP and ISHTP_READY */
timed_wait_for_timeout(dev, WAIT_FOR_FW_RDY,
TIME_SLICE_FOR_FW_RDY_MS, TIMEOUT_FOR_FW_RDY_MS);
if (!ishtp_fw_is_ready(dev)) {
/* ISH FW is dead */
uint32_t ish_status;
ish_status = _ish_read_fw_sts_reg(dev);
dev_err(dev->devc,
"[ishtp-ish]: completed reset, ISH is dead (FWSTS = %08X)\n",
ish_status);
return -ENODEV;
}
return 0;
}
#define TIMEOUT_FOR_HW_RDY_MS 300
/**
* ish_fw_reset_work_fn() - FW reset worker function
* @unused: not used
*
* Call ish_fw_reset_handler to complete FW reset
*/
static void fw_reset_work_fn(struct work_struct *unused)
{
int rv;
rv = ish_fw_reset_handler(ishtp_dev);
if (!rv) {
/* ISH is ILUP & ISHTP-ready. Restart ISHTP */
msleep_interruptible(TIMEOUT_FOR_HW_RDY_MS);
ishtp_dev->recvd_hw_ready = 1;
wake_up_interruptible(&ishtp_dev->wait_hw_ready);
/* ISHTP notification in IPC_RESET sequence completion */
ishtp_reset_compl_handler(ishtp_dev);
} else
dev_err(ishtp_dev->devc, "[ishtp-ish]: FW reset failed (%d)\n",
rv);
}
/**
* _ish_sync_fw_clock() -Sync FW clock with the OS clock
* @dev: ishtp device pointer
*
* Sync FW and OS time
*/
static void _ish_sync_fw_clock(struct ishtp_device *dev)
{
static unsigned long prev_sync;
uint64_t usec;
if (prev_sync && jiffies - prev_sync < 20 * HZ)
return;
prev_sync = jiffies;
usec = ktime_to_us(ktime_get_boottime());
ipc_send_mng_msg(dev, MNG_SYNC_FW_CLOCK, &usec, sizeof(uint64_t));
}
/**
* recv_ipc() - Receive and process IPC management messages
* @dev: ishtp device instance
* @doorbell_val: doorbell value
*
* This function runs in ISR context.
* NOTE: Any other mng command than reset_notify and reset_notify_ack
* won't wake BH handler
*/
static void recv_ipc(struct ishtp_device *dev, uint32_t doorbell_val)
{
uint32_t mng_cmd;
mng_cmd = IPC_HEADER_GET_MNG_CMD(doorbell_val);
switch (mng_cmd) {
default:
break;
case MNG_RX_CMPL_INDICATION:
if (dev->suspend_flag) {
dev->suspend_flag = 0;
wake_up_interruptible(&dev->suspend_wait);
}
if (dev->resume_flag) {
dev->resume_flag = 0;
wake_up_interruptible(&dev->resume_wait);
}
write_ipc_from_queue(dev);
break;
case MNG_RESET_NOTIFY:
if (!ishtp_dev) {
ishtp_dev = dev;
INIT_WORK(&fw_reset_work, fw_reset_work_fn);
}
schedule_work(&fw_reset_work);
break;
case MNG_RESET_NOTIFY_ACK:
dev->recvd_hw_ready = 1;
wake_up_interruptible(&dev->wait_hw_ready);
break;
}
}
/**
* ish_irq_handler() - ISH IRQ handler
* @irq: irq number
* @dev_id: ishtp device pointer
*
* ISH IRQ handler. If interrupt is generated and is for ISH it will process
* the interrupt.
*/
irqreturn_t ish_irq_handler(int irq, void *dev_id)
{
struct ishtp_device *dev = dev_id;
uint32_t doorbell_val;
bool interrupt_generated;
/* Check that it's interrupt from ISH (may be shared) */
interrupt_generated = check_generated_interrupt(dev);
if (!interrupt_generated)
return IRQ_NONE;
doorbell_val = ish_reg_read(dev, IPC_REG_ISH2HOST_DRBL);
if (!IPC_IS_BUSY(doorbell_val))
return IRQ_HANDLED;
if (dev->dev_state == ISHTP_DEV_DISABLED)
return IRQ_HANDLED;
/* Sanity check: IPC dgram length in header */
if (IPC_HEADER_GET_LENGTH(doorbell_val) > IPC_PAYLOAD_SIZE) {
dev_err(dev->devc,
"IPC hdr - bad length: %u; dropped\n",
(unsigned int)IPC_HEADER_GET_LENGTH(doorbell_val));
goto eoi;
}
switch (IPC_HEADER_GET_PROTOCOL(doorbell_val)) {
default:
break;
case IPC_PROTOCOL_MNG:
recv_ipc(dev, doorbell_val);
break;
case IPC_PROTOCOL_ISHTP:
ishtp_recv(dev);
break;
}
eoi:
/* Update IPC counters */
++dev->ipc_rx_cnt;
dev->ipc_rx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val);
ish_reg_write(dev, IPC_REG_ISH2HOST_DRBL, 0);
/* Flush write to doorbell */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
return IRQ_HANDLED;
}
/**
* ish_disable_dma() - disable dma communication between host and ISHFW
* @dev: ishtp device pointer
*
* Clear the dma enable bit and wait for dma inactive.
*
* Return: 0 for success else error code.
*/
int ish_disable_dma(struct ishtp_device *dev)
{
unsigned int dma_delay;
/* Clear the dma enable bit */
ish_reg_write(dev, IPC_REG_ISH_RMP2, 0);
/* wait for dma inactive */
for (dma_delay = 0; dma_delay < MAX_DMA_DELAY &&
_ish_read_fw_sts_reg(dev) & (IPC_ISH_IN_DMA);
dma_delay += 5)
mdelay(5);
if (dma_delay >= MAX_DMA_DELAY) {
dev_err(dev->devc,
"Wait for DMA inactive timeout\n");
return -EBUSY;
}
return 0;
}
/**
* ish_wakeup() - wakeup ishfw from waiting-for-host state
* @dev: ishtp device pointer
*
* Set the dma enable bit and send a void message to FW,
* it wil wakeup FW from waiting-for-host state.
*/
static void ish_wakeup(struct ishtp_device *dev)
{
/* Set dma enable bit */
ish_reg_write(dev, IPC_REG_ISH_RMP2, IPC_RMP2_DMA_ENABLED);
/*
* Send 0 IPC message so that ISH FW wakes up if it was already
* asleep.
*/
ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, IPC_DRBL_BUSY_BIT);
/* Flush writes to doorbell and REMAP2 */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
}
/**
* _ish_hw_reset() - HW reset
* @dev: ishtp device pointer
*
* Reset ISH HW to recover if any error
*
* Return: 0 for success else error fault code
*/
static int _ish_hw_reset(struct ishtp_device *dev)
{
struct pci_dev *pdev = dev->pdev;
int rv;
uint16_t csr;
if (!pdev)
return -ENODEV;
rv = pci_reset_function(pdev);
if (!rv)
dev->dev_state = ISHTP_DEV_RESETTING;
if (!pdev->pm_cap) {
dev_err(&pdev->dev, "Can't reset - no PM caps\n");
return -EINVAL;
}
/* Disable dma communication between FW and host */
if (ish_disable_dma(dev)) {
dev_err(&pdev->dev,
"Can't reset - stuck with DMA in-progress\n");
return -EBUSY;
}
pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &csr);
csr &= ~PCI_PM_CTRL_STATE_MASK;
csr |= PCI_D3hot;
pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr);
mdelay(pdev->d3_delay);
csr &= ~PCI_PM_CTRL_STATE_MASK;
csr |= PCI_D0;
pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr);
/* Now we can enable ISH DMA operation and wakeup ISHFW */
ish_wakeup(dev);
return 0;
}
/**
* _ish_ipc_reset() - IPC reset
* @dev: ishtp device pointer
*
* Resets host and fw IPC and upper layers
*
* Return: 0 for success else error fault code
*/
static int _ish_ipc_reset(struct ishtp_device *dev)
{
struct ipc_rst_payload_type ipc_mng_msg;
int rv = 0;
ipc_mng_msg.reset_id = 1;
ipc_mng_msg.reserved = 0;
set_host_ready(dev);
/* Clear the incoming doorbell */
ish_reg_write(dev, IPC_REG_ISH2HOST_DRBL, 0);
/* Flush write to doorbell */
ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS);
dev->recvd_hw_ready = 0;
/* send message */
rv = ipc_send_mng_msg(dev, MNG_RESET_NOTIFY, &ipc_mng_msg,
sizeof(struct ipc_rst_payload_type));
if (rv) {
dev_err(dev->devc, "Failed to send IPC MNG_RESET_NOTIFY\n");
return rv;
}
wait_event_interruptible_timeout(dev->wait_hw_ready,
dev->recvd_hw_ready, 2 * HZ);
if (!dev->recvd_hw_ready) {
dev_err(dev->devc, "Timed out waiting for HW ready\n");
rv = -ENODEV;
}
return rv;
}
/**
* ish_hw_start() -Start ISH HW
* @dev: ishtp device pointer
*
* Set host to ready state and wait for FW reset
*
* Return: 0 for success else error fault code
*/
int ish_hw_start(struct ishtp_device *dev)
{
ish_set_host_rdy(dev);
set_host_ready(dev);
/* After that we can enable ISH DMA operation and wakeup ISHFW */
ish_wakeup(dev);
/* wait for FW-initiated reset flow */
if (!dev->recvd_hw_ready)
wait_event_interruptible_timeout(dev->wait_hw_ready,
dev->recvd_hw_ready,
10 * HZ);
if (!dev->recvd_hw_ready) {
dev_err(dev->devc,
"[ishtp-ish]: Timed out waiting for FW-initiated reset\n");
return -ENODEV;
}
return 0;
}
/**
* ish_ipc_get_header() -Get doorbell value
* @dev: ishtp device pointer
* @length: length of message
* @busy: busy status
*
* Get door bell value from message header
*
* Return: door bell value
*/
static uint32_t ish_ipc_get_header(struct ishtp_device *dev, int length,
int busy)
{
uint32_t drbl_val;
drbl_val = IPC_BUILD_HEADER(length, IPC_PROTOCOL_ISHTP, busy);
return drbl_val;
}
static const struct ishtp_hw_ops ish_hw_ops = {
.hw_reset = _ish_hw_reset,
.ipc_reset = _ish_ipc_reset,
.ipc_get_header = ish_ipc_get_header,
.ishtp_read = _ishtp_read,
.write = write_ipc_to_queue,
.get_fw_status = _ish_read_fw_sts_reg,
.sync_fw_clock = _ish_sync_fw_clock,
.ishtp_read_hdr = _ishtp_read_hdr
};
/**
* ish_dev_init() -Initialize ISH devoce
* @pdev: PCI device
*
* Allocate ISHTP device and initialize IPC processing
*
* Return: ISHTP device instance on success else NULL
*/
struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
{
struct ishtp_device *dev;
int i;
dev = devm_kzalloc(&pdev->dev,
sizeof(struct ishtp_device) + sizeof(struct ish_hw),
GFP_KERNEL);
if (!dev)
return NULL;
ishtp_device_init(dev);
init_waitqueue_head(&dev->wait_hw_ready);
spin_lock_init(&dev->wr_processing_spinlock);
/* Init IPC processing and free lists */
INIT_LIST_HEAD(&dev->wr_processing_list);
INIT_LIST_HEAD(&dev->wr_free_list);
for (i = 0; i < IPC_TX_FIFO_SIZE; i++) {
struct wr_msg_ctl_info *tx_buf;
tx_buf = devm_kzalloc(&pdev->dev,
sizeof(struct wr_msg_ctl_info),
GFP_KERNEL);
if (!tx_buf) {
/*
* IPC buffers may be limited or not available
* at all - although this shouldn't happen
*/
dev_err(dev->devc,
"[ishtp-ish]: failure in Tx FIFO allocations (%d)\n",
i);
break;
}
list_add_tail(&tx_buf->link, &dev->wr_free_list);
}
dev->ops = &ish_hw_ops;
dev->devc = &pdev->dev;
dev->mtu = IPC_PAYLOAD_SIZE - sizeof(struct ishtp_msg_hdr);
return dev;
}
/**
* ish_device_disable() - Disable ISH device
* @dev: ISHTP device pointer
*
* Disable ISH by clearing host ready to inform firmware.
*/
void ish_device_disable(struct ishtp_device *dev)
{
struct pci_dev *pdev = dev->pdev;
if (!pdev)
return;
/* Disable dma communication between FW and host */
if (ish_disable_dma(dev)) {
dev_err(&pdev->dev,
"Can't reset - stuck with DMA in-progress\n");
return;
}
/* Put ISH to D3hot state for power saving */
pci_set_power_state(pdev, PCI_D3hot);
dev->dev_state = ISHTP_DEV_DISABLED;
ish_clr_host_rdy(dev);
}
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