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linux/drivers/firmware/ti_sci.c

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/*
* Texas Instruments System Control Interface Protocol Driver
*
* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
* Nishanth Menon
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/bitmap.h>
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
#include <linux/soc/ti/ti-msgmgr.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <linux/reboot.h>
#include "ti_sci.h"
/* List of all TI SCI devices active in system */
static LIST_HEAD(ti_sci_list);
/* Protection for the entire list */
static DEFINE_MUTEX(ti_sci_list_mutex);
/**
* struct ti_sci_xfer - Structure representing a message flow
* @tx_message: Transmit message
* @rx_len: Receive message length
* @xfer_buf: Preallocated buffer to store receive message
* Since we work with request-ACK protocol, we can
* reuse the same buffer for the rx path as we
* use for the tx path.
* @done: completion event
*/
struct ti_sci_xfer {
struct ti_msgmgr_message tx_message;
u8 rx_len;
u8 *xfer_buf;
struct completion done;
};
/**
* struct ti_sci_xfers_info - Structure to manage transfer information
* @sem_xfer_count: Counting Semaphore for managing max simultaneous
* Messages.
* @xfer_block: Preallocated Message array
* @xfer_alloc_table: Bitmap table for allocated messages.
* Index of this bitmap table is also used for message
* sequence identifier.
* @xfer_lock: Protection for message allocation
*/
struct ti_sci_xfers_info {
struct semaphore sem_xfer_count;
struct ti_sci_xfer *xfer_block;
unsigned long *xfer_alloc_table;
/* protect transfer allocation */
spinlock_t xfer_lock;
};
/**
* struct ti_sci_desc - Description of SoC integration
* @host_id: Host identifier representing the compute entity
* @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
* @max_msgs: Maximum number of messages that can be pending
* simultaneously in the system
* @max_msg_size: Maximum size of data per message that can be handled.
*/
struct ti_sci_desc {
u8 host_id;
int max_rx_timeout_ms;
int max_msgs;
int max_msg_size;
};
/**
* struct ti_sci_info - Structure representing a TI SCI instance
* @dev: Device pointer
* @desc: SoC description for this instance
* @nb: Reboot Notifier block
* @d: Debugfs file entry
* @debug_region: Memory region where the debug message are available
* @debug_region_size: Debug region size
* @debug_buffer: Buffer allocated to copy debug messages.
* @handle: Instance of TI SCI handle to send to clients.
* @cl: Mailbox Client
* @chan_tx: Transmit mailbox channel
* @chan_rx: Receive mailbox channel
* @minfo: Message info
* @node: list head
* @users: Number of users of this instance
*/
struct ti_sci_info {
struct device *dev;
struct notifier_block nb;
const struct ti_sci_desc *desc;
struct dentry *d;
void __iomem *debug_region;
char *debug_buffer;
size_t debug_region_size;
struct ti_sci_handle handle;
struct mbox_client cl;
struct mbox_chan *chan_tx;
struct mbox_chan *chan_rx;
struct ti_sci_xfers_info minfo;
struct list_head node;
/* protected by ti_sci_list_mutex */
int users;
};
#define cl_to_ti_sci_info(c) container_of(c, struct ti_sci_info, cl)
#define handle_to_ti_sci_info(h) container_of(h, struct ti_sci_info, handle)
#define reboot_to_ti_sci_info(n) container_of(n, struct ti_sci_info, nb)
#ifdef CONFIG_DEBUG_FS
/**
* ti_sci_debug_show() - Helper to dump the debug log
* @s: sequence file pointer
* @unused: unused.
*
* Return: 0
*/
static int ti_sci_debug_show(struct seq_file *s, void *unused)
{
struct ti_sci_info *info = s->private;
memcpy_fromio(info->debug_buffer, info->debug_region,
info->debug_region_size);
/*
* We don't trust firmware to leave NULL terminated last byte (hence
* we have allocated 1 extra 0 byte). Since we cannot guarantee any
* specific data format for debug messages, We just present the data
* in the buffer as is - we expect the messages to be self explanatory.
*/
seq_puts(s, info->debug_buffer);
return 0;
}
/**
* ti_sci_debug_open() - debug file open
* @inode: inode pointer
* @file: file pointer
*
* Return: result of single_open
*/
static int ti_sci_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, ti_sci_debug_show, inode->i_private);
}
/* log file operations */
static const struct file_operations ti_sci_debug_fops = {
.open = ti_sci_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/**
* ti_sci_debugfs_create() - Create log debug file
* @pdev: platform device pointer
* @info: Pointer to SCI entity information
*
* Return: 0 if all went fine, else corresponding error.
*/
static int ti_sci_debugfs_create(struct platform_device *pdev,
struct ti_sci_info *info)
{
struct device *dev = &pdev->dev;
struct resource *res;
char debug_name[50] = "ti_sci_debug@";
/* Debug region is optional */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"debug_messages");
info->debug_region = devm_ioremap_resource(dev, res);
if (IS_ERR(info->debug_region))
return 0;
info->debug_region_size = resource_size(res);
info->debug_buffer = devm_kcalloc(dev, info->debug_region_size + 1,
sizeof(char), GFP_KERNEL);
if (!info->debug_buffer)
return -ENOMEM;
/* Setup NULL termination */
info->debug_buffer[info->debug_region_size] = 0;
info->d = debugfs_create_file(strncat(debug_name, dev_name(dev),
sizeof(debug_name) -
sizeof("ti_sci_debug@")),
0444, NULL, info, &ti_sci_debug_fops);
if (IS_ERR(info->d))
return PTR_ERR(info->d);
dev_dbg(dev, "Debug region => %p, size = %zu bytes, resource: %pr\n",
info->debug_region, info->debug_region_size, res);
return 0;
}
/**
* ti_sci_debugfs_destroy() - clean up log debug file
* @pdev: platform device pointer
* @info: Pointer to SCI entity information
*/
static void ti_sci_debugfs_destroy(struct platform_device *pdev,
struct ti_sci_info *info)
{
if (IS_ERR(info->debug_region))
return;
debugfs_remove(info->d);
}
#else /* CONFIG_DEBUG_FS */
static inline int ti_sci_debugfs_create(struct platform_device *dev,
struct ti_sci_info *info)
{
return 0;
}
static inline void ti_sci_debugfs_destroy(struct platform_device *dev,
struct ti_sci_info *info)
{
}
#endif /* CONFIG_DEBUG_FS */
/**
* ti_sci_dump_header_dbg() - Helper to dump a message header.
* @dev: Device pointer corresponding to the SCI entity
* @hdr: pointer to header.
*/
static inline void ti_sci_dump_header_dbg(struct device *dev,
struct ti_sci_msg_hdr *hdr)
{
dev_dbg(dev, "MSGHDR:type=0x%04x host=0x%02x seq=0x%02x flags=0x%08x\n",
hdr->type, hdr->host, hdr->seq, hdr->flags);
}
/**
* ti_sci_rx_callback() - mailbox client callback for receive messages
* @cl: client pointer
* @m: mailbox message
*
* Processes one received message to appropriate transfer information and
* signals completion of the transfer.
*
* NOTE: This function will be invoked in IRQ context, hence should be
* as optimal as possible.
*/
static void ti_sci_rx_callback(struct mbox_client *cl, void *m)
{
struct ti_sci_info *info = cl_to_ti_sci_info(cl);
struct device *dev = info->dev;
struct ti_sci_xfers_info *minfo = &info->minfo;
struct ti_msgmgr_message *mbox_msg = m;
struct ti_sci_msg_hdr *hdr = (struct ti_sci_msg_hdr *)mbox_msg->buf;
struct ti_sci_xfer *xfer;
u8 xfer_id;
xfer_id = hdr->seq;
/*
* Are we even expecting this?
* NOTE: barriers were implicit in locks used for modifying the bitmap
*/
if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
dev_err(dev, "Message for %d is not expected!\n", xfer_id);
return;
}
xfer = &minfo->xfer_block[xfer_id];
/* Is the message of valid length? */
if (mbox_msg->len > info->desc->max_msg_size) {
dev_err(dev, "Unable to handle %zu xfer(max %d)\n",
mbox_msg->len, info->desc->max_msg_size);
ti_sci_dump_header_dbg(dev, hdr);
return;
}
if (mbox_msg->len < xfer->rx_len) {
dev_err(dev, "Recv xfer %zu < expected %d length\n",
mbox_msg->len, xfer->rx_len);
ti_sci_dump_header_dbg(dev, hdr);
return;
}
ti_sci_dump_header_dbg(dev, hdr);
/* Take a copy to the rx buffer.. */
memcpy(xfer->xfer_buf, mbox_msg->buf, xfer->rx_len);
complete(&xfer->done);
}
/**
* ti_sci_get_one_xfer() - Allocate one message
* @info: Pointer to SCI entity information
* @msg_type: Message type
* @msg_flags: Flag to set for the message
* @tx_message_size: transmit message size
* @rx_message_size: receive message size
*
* Helper function which is used by various command functions that are
* exposed to clients of this driver for allocating a message traffic event.
*
* This function can sleep depending on pending requests already in the system
* for the SCI entity. Further, this also holds a spinlock to maintain integrity
* of internal data structures.
*
* Return: 0 if all went fine, else corresponding error.
*/
static struct ti_sci_xfer *ti_sci_get_one_xfer(struct ti_sci_info *info,
u16 msg_type, u32 msg_flags,
size_t tx_message_size,
size_t rx_message_size)
{
struct ti_sci_xfers_info *minfo = &info->minfo;
struct ti_sci_xfer *xfer;
struct ti_sci_msg_hdr *hdr;
unsigned long flags;
unsigned long bit_pos;
u8 xfer_id;
int ret;
int timeout;
/* Ensure we have sane transfer sizes */
if (rx_message_size > info->desc->max_msg_size ||
tx_message_size > info->desc->max_msg_size ||
rx_message_size < sizeof(*hdr) || tx_message_size < sizeof(*hdr))
return ERR_PTR(-ERANGE);
/*
* Ensure we have only controlled number of pending messages.
* Ideally, we might just have to wait a single message, be
* conservative and wait 5 times that..
*/
timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms) * 5;
ret = down_timeout(&minfo->sem_xfer_count, timeout);
if (ret < 0)
return ERR_PTR(ret);
/* Keep the locked section as small as possible */
spin_lock_irqsave(&minfo->xfer_lock, flags);
bit_pos = find_first_zero_bit(minfo->xfer_alloc_table,
info->desc->max_msgs);
set_bit(bit_pos, minfo->xfer_alloc_table);
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
/*
* We already ensured in probe that we can have max messages that can
* fit in hdr.seq - NOTE: this improves access latencies
* to predictable O(1) access, BUT, it opens us to risk if
* remote misbehaves with corrupted message sequence responses.
* If that happens, we are going to be messed up anyways..
*/
xfer_id = (u8)bit_pos;
xfer = &minfo->xfer_block[xfer_id];
hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
xfer->tx_message.len = tx_message_size;
xfer->rx_len = (u8)rx_message_size;
reinit_completion(&xfer->done);
hdr->seq = xfer_id;
hdr->type = msg_type;
hdr->host = info->desc->host_id;
hdr->flags = msg_flags;
return xfer;
}
/**
* ti_sci_put_one_xfer() - Release a message
* @minfo: transfer info pointer
* @xfer: message that was reserved by ti_sci_get_one_xfer
*
* This holds a spinlock to maintain integrity of internal data structures.
*/
static void ti_sci_put_one_xfer(struct ti_sci_xfers_info *minfo,
struct ti_sci_xfer *xfer)
{
unsigned long flags;
struct ti_sci_msg_hdr *hdr;
u8 xfer_id;
hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
xfer_id = hdr->seq;
/*
* Keep the locked section as small as possible
* NOTE: we might escape with smp_mb and no lock here..
* but just be conservative and symmetric.
*/
spin_lock_irqsave(&minfo->xfer_lock, flags);
clear_bit(xfer_id, minfo->xfer_alloc_table);
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
/* Increment the count for the next user to get through */
up(&minfo->sem_xfer_count);
}
/**
* ti_sci_do_xfer() - Do one transfer
* @info: Pointer to SCI entity information
* @xfer: Transfer to initiate and wait for response
*
* Return: -ETIMEDOUT in case of no response, if transmit error,
* return corresponding error, else if all goes well,
* return 0.
*/
static inline int ti_sci_do_xfer(struct ti_sci_info *info,
struct ti_sci_xfer *xfer)
{
int ret;
int timeout;
struct device *dev = info->dev;
ret = mbox_send_message(info->chan_tx, &xfer->tx_message);
if (ret < 0)
return ret;
ret = 0;
/* And we wait for the response. */
timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
if (!wait_for_completion_timeout(&xfer->done, timeout)) {
dev_err(dev, "Mbox timedout in resp(caller: %pS)\n",
(void *)_RET_IP_);
ret = -ETIMEDOUT;
}
/*
* NOTE: we might prefer not to need the mailbox ticker to manage the
* transfer queueing since the protocol layer queues things by itself.
* Unfortunately, we have to kick the mailbox framework after we have
* received our message.
*/
mbox_client_txdone(info->chan_tx, ret);
return ret;
}
/**
* ti_sci_cmd_get_revision() - command to get the revision of the SCI entity
* @info: Pointer to SCI entity information
*
* Updates the SCI information in the internal data structure.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_revision(struct ti_sci_info *info)
{
struct device *dev = info->dev;
struct ti_sci_handle *handle = &info->handle;
struct ti_sci_version_info *ver = &handle->version;
struct ti_sci_msg_resp_version *rev_info;
struct ti_sci_xfer *xfer;
int ret;
/* No need to setup flags since it is expected to respond */
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_VERSION,
0x0, sizeof(struct ti_sci_msg_hdr),
sizeof(*rev_info));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
rev_info = (struct ti_sci_msg_resp_version *)xfer->xfer_buf;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
ver->abi_major = rev_info->abi_major;
ver->abi_minor = rev_info->abi_minor;
ver->firmware_revision = rev_info->firmware_revision;
strncpy(ver->firmware_description, rev_info->firmware_description,
sizeof(ver->firmware_description));
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_is_response_ack() - Generic ACK/NACK message checkup
* @r: pointer to response buffer
*
* Return: true if the response was an ACK, else returns false.
*/
static inline bool ti_sci_is_response_ack(void *r)
{
struct ti_sci_msg_hdr *hdr = r;
return hdr->flags & TI_SCI_FLAG_RESP_GENERIC_ACK ? true : false;
}
/**
* ti_sci_set_device_state() - Set device state helper
* @handle: pointer to TI SCI handle
* @id: Device identifier
* @flags: flags to setup for the device
* @state: State to move the device to
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_set_device_state(const struct ti_sci_handle *handle,
u32 id, u32 flags, u8 state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_device_state *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_DEVICE_STATE,
flags | TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_device_state *)xfer->xfer_buf;
req->id = id;
req->state = state;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_get_device_state() - Get device state helper
* @handle: Handle to the device
* @id: Device Identifier
* @clcnt: Pointer to Context Loss Count
* @resets: pointer to resets
* @p_state: pointer to p_state
* @c_state: pointer to c_state
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
u32 id, u32 *clcnt, u32 *resets,
u8 *p_state, u8 *c_state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_get_device_state *req;
struct ti_sci_msg_resp_get_device_state *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
if (!clcnt && !resets && !p_state && !c_state)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
/* Response is expected, so need of any flags */
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_DEVICE_STATE,
0, sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_get_device_state *)xfer->xfer_buf;
req->id = id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_get_device_state *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp)) {
ret = -ENODEV;
goto fail;
}
if (clcnt)
*clcnt = resp->context_loss_count;
if (resets)
*resets = resp->resets;
if (p_state)
*p_state = resp->programmed_state;
if (c_state)
*c_state = resp->current_state;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_get_device() - command to request for device managed by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* NOTE: The request is for exclusive access for the processor.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_device(const struct ti_sci_handle *handle, u32 id)
{
return ti_sci_set_device_state(handle, id,
MSG_FLAG_DEVICE_EXCLUSIVE,
MSG_DEVICE_SW_STATE_ON);
}
/**
* ti_sci_cmd_idle_device() - Command to idle a device managed by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_idle_device(const struct ti_sci_handle *handle, u32 id)
{
return ti_sci_set_device_state(handle, id,
MSG_FLAG_DEVICE_EXCLUSIVE,
MSG_DEVICE_SW_STATE_RETENTION);
}
/**
* ti_sci_cmd_put_device() - command to release a device managed by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Request for the device - NOTE: the client MUST maintain integrity of
* usage count by balancing get_device with put_device. No refcounting is
* managed by driver for that purpose.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_put_device(const struct ti_sci_handle *handle, u32 id)
{
return ti_sci_set_device_state(handle, id,
0, MSG_DEVICE_SW_STATE_AUTO_OFF);
}
/**
* ti_sci_cmd_dev_is_valid() - Is the device valid
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
*
* Return: 0 if all went fine and the device ID is valid, else return
* appropriate error.
*/
static int ti_sci_cmd_dev_is_valid(const struct ti_sci_handle *handle, u32 id)
{
u8 unused;
/* check the device state which will also tell us if the ID is valid */
return ti_sci_get_device_state(handle, id, NULL, NULL, NULL, &unused);
}
/**
* ti_sci_cmd_dev_get_clcnt() - Get context loss counter
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @count: Pointer to Context Loss counter to populate
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_get_clcnt(const struct ti_sci_handle *handle, u32 id,
u32 *count)
{
return ti_sci_get_device_state(handle, id, count, NULL, NULL, NULL);
}
/**
* ti_sci_cmd_dev_is_idle() - Check if the device is requested to be idle
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @r_state: true if requested to be idle
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_idle(const struct ti_sci_handle *handle, u32 id,
bool *r_state)
{
int ret;
u8 state;
if (!r_state)
return -EINVAL;
ret = ti_sci_get_device_state(handle, id, NULL, NULL, &state, NULL);
if (ret)
return ret;
*r_state = (state == MSG_DEVICE_SW_STATE_RETENTION);
return 0;
}
/**
* ti_sci_cmd_dev_is_stop() - Check if the device is requested to be stopped
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @r_state: true if requested to be stopped
* @curr_state: true if currently stopped.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_stop(const struct ti_sci_handle *handle, u32 id,
bool *r_state, bool *curr_state)
{
int ret;
u8 p_state, c_state;
if (!r_state && !curr_state)
return -EINVAL;
ret =
ti_sci_get_device_state(handle, id, NULL, NULL, &p_state, &c_state);
if (ret)
return ret;
if (r_state)
*r_state = (p_state == MSG_DEVICE_SW_STATE_AUTO_OFF);
if (curr_state)
*curr_state = (c_state == MSG_DEVICE_HW_STATE_OFF);
return 0;
}
/**
* ti_sci_cmd_dev_is_on() - Check if the device is requested to be ON
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @r_state: true if requested to be ON
* @curr_state: true if currently ON and active
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_on(const struct ti_sci_handle *handle, u32 id,
bool *r_state, bool *curr_state)
{
int ret;
u8 p_state, c_state;
if (!r_state && !curr_state)
return -EINVAL;
ret =
ti_sci_get_device_state(handle, id, NULL, NULL, &p_state, &c_state);
if (ret)
return ret;
if (r_state)
*r_state = (p_state == MSG_DEVICE_SW_STATE_ON);
if (curr_state)
*curr_state = (c_state == MSG_DEVICE_HW_STATE_ON);
return 0;
}
/**
* ti_sci_cmd_dev_is_trans() - Check if the device is currently transitioning
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @curr_state: true if currently transitioning.
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_dev_is_trans(const struct ti_sci_handle *handle, u32 id,
bool *curr_state)
{
int ret;
u8 state;
if (!curr_state)
return -EINVAL;
ret = ti_sci_get_device_state(handle, id, NULL, NULL, NULL, &state);
if (ret)
return ret;
*curr_state = (state == MSG_DEVICE_HW_STATE_TRANS);
return 0;
}
/**
* ti_sci_cmd_set_device_resets() - command to set resets for device managed
* by TISCI
* @handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
* @id: Device Identifier
* @reset_state: Device specific reset bit field
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_set_device_resets(const struct ti_sci_handle *handle,
u32 id, u32 reset_state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_device_resets *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_DEVICE_RESETS,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_device_resets *)xfer->xfer_buf;
req->id = id;
req->resets = reset_state;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_get_device_resets() - Get reset state for device managed
* by TISCI
* @handle: Pointer to TISCI handle
* @id: Device Identifier
* @reset_state: Pointer to reset state to populate
*
* Return: 0 if all went fine, else return appropriate error.
*/
static int ti_sci_cmd_get_device_resets(const struct ti_sci_handle *handle,
u32 id, u32 *reset_state)
{
return ti_sci_get_device_state(handle, id, NULL, reset_state, NULL,
NULL);
}
/**
* ti_sci_set_clock_state() - Set clock state helper
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @flags: Header flags as needed
* @state: State to request for the clock.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_set_clock_state(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id,
u32 flags, u8 state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_clock_state *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_STATE,
flags | TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_clock_state *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
req->request_state = state;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_get_clock_state() - Get clock state helper
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @programmed_state: State requested for clock to move to
* @current_state: State that the clock is currently in
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_get_clock_state(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id,
u8 *programmed_state, u8 *current_state)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_get_clock_state *req;
struct ti_sci_msg_resp_get_clock_state *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
if (!programmed_state && !current_state)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_STATE,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_get_clock_state *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_get_clock_state *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp)) {
ret = -ENODEV;
goto fail;
}
if (programmed_state)
*programmed_state = resp->programmed_state;
if (current_state)
*current_state = resp->current_state;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_get_clock() - Get control of a clock from TI SCI
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @needs_ssc: 'true' if Spread Spectrum clock is desired, else 'false'
* @can_change_freq: 'true' if frequency change is desired, else 'false'
* @enable_input_term: 'true' if input termination is desired, else 'false'
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_get_clock(const struct ti_sci_handle *handle, u32 dev_id,
u8 clk_id, bool needs_ssc, bool can_change_freq,
bool enable_input_term)
{
u32 flags = 0;
flags |= needs_ssc ? MSG_FLAG_CLOCK_ALLOW_SSC : 0;
flags |= can_change_freq ? MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE : 0;
flags |= enable_input_term ? MSG_FLAG_CLOCK_INPUT_TERM : 0;
return ti_sci_set_clock_state(handle, dev_id, clk_id, flags,
MSG_CLOCK_SW_STATE_REQ);
}
/**
* ti_sci_cmd_idle_clock() - Idle a clock which is in our control
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
*
* NOTE: This clock must have been requested by get_clock previously.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_idle_clock(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id)
{
return ti_sci_set_clock_state(handle, dev_id, clk_id, 0,
MSG_CLOCK_SW_STATE_UNREQ);
}
/**
* ti_sci_cmd_put_clock() - Release a clock from our control back to TISCI
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
*
* NOTE: This clock must have been requested by get_clock previously.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_put_clock(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id)
{
return ti_sci_set_clock_state(handle, dev_id, clk_id, 0,
MSG_CLOCK_SW_STATE_AUTO);
}
/**
* ti_sci_cmd_clk_is_auto() - Is the clock being auto managed
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @req_state: state indicating if the clock is auto managed
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_is_auto(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id, bool *req_state)
{
u8 state = 0;
int ret;
if (!req_state)
return -EINVAL;
ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id, &state, NULL);
if (ret)
return ret;
*req_state = (state == MSG_CLOCK_SW_STATE_AUTO);
return 0;
}
/**
* ti_sci_cmd_clk_is_on() - Is the clock ON
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @req_state: state indicating if the clock is managed by us and enabled
* @curr_state: state indicating if the clock is ready for operation
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_is_on(const struct ti_sci_handle *handle, u32 dev_id,
u8 clk_id, bool *req_state, bool *curr_state)
{
u8 c_state = 0, r_state = 0;
int ret;
if (!req_state && !curr_state)
return -EINVAL;
ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id,
&r_state, &c_state);
if (ret)
return ret;
if (req_state)
*req_state = (r_state == MSG_CLOCK_SW_STATE_REQ);
if (curr_state)
*curr_state = (c_state == MSG_CLOCK_HW_STATE_READY);
return 0;
}
/**
* ti_sci_cmd_clk_is_off() - Is the clock OFF
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @req_state: state indicating if the clock is managed by us and disabled
* @curr_state: state indicating if the clock is NOT ready for operation
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_is_off(const struct ti_sci_handle *handle, u32 dev_id,
u8 clk_id, bool *req_state, bool *curr_state)
{
u8 c_state = 0, r_state = 0;
int ret;
if (!req_state && !curr_state)
return -EINVAL;
ret = ti_sci_cmd_get_clock_state(handle, dev_id, clk_id,
&r_state, &c_state);
if (ret)
return ret;
if (req_state)
*req_state = (r_state == MSG_CLOCK_SW_STATE_UNREQ);
if (curr_state)
*curr_state = (c_state == MSG_CLOCK_HW_STATE_NOT_READY);
return 0;
}
/**
* ti_sci_cmd_clk_set_parent() - Set the clock source of a specific device clock
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @parent_id: Parent clock identifier to set
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_set_parent(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id, u8 parent_id)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_clock_parent *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_PARENT,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_clock_parent *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
req->parent_id = parent_id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_clk_get_parent() - Get current parent clock source
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @parent_id: Current clock parent
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_get_parent(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id, u8 *parent_id)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_get_clock_parent *req;
struct ti_sci_msg_resp_get_clock_parent *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle || !parent_id)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_PARENT,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_get_clock_parent *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_get_clock_parent *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp))
ret = -ENODEV;
else
*parent_id = resp->parent_id;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_clk_get_num_parents() - Get num parents of the current clk source
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @num_parents: Returns he number of parents to the current clock.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_get_num_parents(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id,
u8 *num_parents)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_get_clock_num_parents *req;
struct ti_sci_msg_resp_get_clock_num_parents *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle || !num_parents)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_NUM_CLOCK_PARENTS,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_get_clock_num_parents *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_get_clock_num_parents *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp))
ret = -ENODEV;
else
*num_parents = resp->num_parents;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_clk_get_match_freq() - Find a good match for frequency
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @min_freq: The minimum allowable frequency in Hz. This is the minimum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @target_freq: The target clock frequency in Hz. A frequency will be
* processed as close to this target frequency as possible.
* @max_freq: The maximum allowable frequency in Hz. This is the maximum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @match_freq: Frequency match in Hz response.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_get_match_freq(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id, u64 min_freq,
u64 target_freq, u64 max_freq,
u64 *match_freq)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_query_clock_freq *req;
struct ti_sci_msg_resp_query_clock_freq *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle || !match_freq)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_QUERY_CLOCK_FREQ,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_query_clock_freq *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
req->min_freq_hz = min_freq;
req->target_freq_hz = target_freq;
req->max_freq_hz = max_freq;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_query_clock_freq *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp))
ret = -ENODEV;
else
*match_freq = resp->freq_hz;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_clk_set_freq() - Set a frequency for clock
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @min_freq: The minimum allowable frequency in Hz. This is the minimum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @target_freq: The target clock frequency in Hz. A frequency will be
* processed as close to this target frequency as possible.
* @max_freq: The maximum allowable frequency in Hz. This is the maximum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_set_freq(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id, u64 min_freq,
u64 target_freq, u64 max_freq)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_set_clock_freq *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CLOCK_FREQ,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_set_clock_freq *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
req->min_freq_hz = min_freq;
req->target_freq_hz = target_freq;
req->max_freq_hz = max_freq;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/**
* ti_sci_cmd_clk_get_freq() - Get current frequency
* @handle: pointer to TI SCI handle
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @freq: Currently frequency in Hz
*
* Return: 0 if all went well, else returns appropriate error value.
*/
static int ti_sci_cmd_clk_get_freq(const struct ti_sci_handle *handle,
u32 dev_id, u8 clk_id, u64 *freq)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_get_clock_freq *req;
struct ti_sci_msg_resp_get_clock_freq *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle || !freq)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_CLOCK_FREQ,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_get_clock_freq *)xfer->xfer_buf;
req->dev_id = dev_id;
req->clk_id = clk_id;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_resp_get_clock_freq *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp))
ret = -ENODEV;
else
*freq = resp->freq_hz;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
static int ti_sci_cmd_core_reboot(const struct ti_sci_handle *handle)
{
struct ti_sci_info *info;
struct ti_sci_msg_req_reboot *req;
struct ti_sci_msg_hdr *resp;
struct ti_sci_xfer *xfer;
struct device *dev;
int ret = 0;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
dev = info->dev;
xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SYS_RESET,
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
sizeof(*req), sizeof(*resp));
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "Message alloc failed(%d)\n", ret);
return ret;
}
req = (struct ti_sci_msg_req_reboot *)xfer->xfer_buf;
ret = ti_sci_do_xfer(info, xfer);
if (ret) {
dev_err(dev, "Mbox send fail %d\n", ret);
goto fail;
}
resp = (struct ti_sci_msg_hdr *)xfer->xfer_buf;
if (!ti_sci_is_response_ack(resp))
ret = -ENODEV;
else
ret = 0;
fail:
ti_sci_put_one_xfer(&info->minfo, xfer);
return ret;
}
/*
* ti_sci_setup_ops() - Setup the operations structures
* @info: pointer to TISCI pointer
*/
static void ti_sci_setup_ops(struct ti_sci_info *info)
{
struct ti_sci_ops *ops = &info->handle.ops;
struct ti_sci_core_ops *core_ops = &ops->core_ops;
struct ti_sci_dev_ops *dops = &ops->dev_ops;
struct ti_sci_clk_ops *cops = &ops->clk_ops;
core_ops->reboot_device = ti_sci_cmd_core_reboot;
dops->get_device = ti_sci_cmd_get_device;
dops->idle_device = ti_sci_cmd_idle_device;
dops->put_device = ti_sci_cmd_put_device;
dops->is_valid = ti_sci_cmd_dev_is_valid;
dops->get_context_loss_count = ti_sci_cmd_dev_get_clcnt;
dops->is_idle = ti_sci_cmd_dev_is_idle;
dops->is_stop = ti_sci_cmd_dev_is_stop;
dops->is_on = ti_sci_cmd_dev_is_on;
dops->is_transitioning = ti_sci_cmd_dev_is_trans;
dops->set_device_resets = ti_sci_cmd_set_device_resets;
dops->get_device_resets = ti_sci_cmd_get_device_resets;
cops->get_clock = ti_sci_cmd_get_clock;
cops->idle_clock = ti_sci_cmd_idle_clock;
cops->put_clock = ti_sci_cmd_put_clock;
cops->is_auto = ti_sci_cmd_clk_is_auto;
cops->is_on = ti_sci_cmd_clk_is_on;
cops->is_off = ti_sci_cmd_clk_is_off;
cops->set_parent = ti_sci_cmd_clk_set_parent;
cops->get_parent = ti_sci_cmd_clk_get_parent;
cops->get_num_parents = ti_sci_cmd_clk_get_num_parents;
cops->get_best_match_freq = ti_sci_cmd_clk_get_match_freq;
cops->set_freq = ti_sci_cmd_clk_set_freq;
cops->get_freq = ti_sci_cmd_clk_get_freq;
}
/**
* ti_sci_get_handle() - Get the TI SCI handle for a device
* @dev: Pointer to device for which we want SCI handle
*
* NOTE: The function does not track individual clients of the framework
* and is expected to be maintained by caller of TI SCI protocol library.
* ti_sci_put_handle must be balanced with successful ti_sci_get_handle
* Return: pointer to handle if successful, else:
* -EPROBE_DEFER if the instance is not ready
* -ENODEV if the required node handler is missing
* -EINVAL if invalid conditions are encountered.
*/
const struct ti_sci_handle *ti_sci_get_handle(struct device *dev)
{
struct device_node *ti_sci_np;
struct list_head *p;
struct ti_sci_handle *handle = NULL;
struct ti_sci_info *info;
if (!dev) {
pr_err("I need a device pointer\n");
return ERR_PTR(-EINVAL);
}
ti_sci_np = of_get_parent(dev->of_node);
if (!ti_sci_np) {
dev_err(dev, "No OF information\n");
return ERR_PTR(-EINVAL);
}
mutex_lock(&ti_sci_list_mutex);
list_for_each(p, &ti_sci_list) {
info = list_entry(p, struct ti_sci_info, node);
if (ti_sci_np == info->dev->of_node) {
handle = &info->handle;
info->users++;
break;
}
}
mutex_unlock(&ti_sci_list_mutex);
of_node_put(ti_sci_np);
if (!handle)
return ERR_PTR(-EPROBE_DEFER);
return handle;
}
EXPORT_SYMBOL_GPL(ti_sci_get_handle);
/**
* ti_sci_put_handle() - Release the handle acquired by ti_sci_get_handle
* @handle: Handle acquired by ti_sci_get_handle
*
* NOTE: The function does not track individual clients of the framework
* and is expected to be maintained by caller of TI SCI protocol library.
* ti_sci_put_handle must be balanced with successful ti_sci_get_handle
*
* Return: 0 is successfully released
* if an error pointer was passed, it returns the error value back,
* if null was passed, it returns -EINVAL;
*/
int ti_sci_put_handle(const struct ti_sci_handle *handle)
{
struct ti_sci_info *info;
if (IS_ERR(handle))
return PTR_ERR(handle);
if (!handle)
return -EINVAL;
info = handle_to_ti_sci_info(handle);
mutex_lock(&ti_sci_list_mutex);
if (!WARN_ON(!info->users))
info->users--;
mutex_unlock(&ti_sci_list_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(ti_sci_put_handle);
static void devm_ti_sci_release(struct device *dev, void *res)
{
const struct ti_sci_handle **ptr = res;
const struct ti_sci_handle *handle = *ptr;
int ret;
ret = ti_sci_put_handle(handle);
if (ret)
dev_err(dev, "failed to put handle %d\n", ret);
}
/**
* devm_ti_sci_get_handle() - Managed get handle
* @dev: device for which we want SCI handle for.
*
* NOTE: This releases the handle once the device resources are
* no longer needed. MUST NOT BE released with ti_sci_put_handle.
* The function does not track individual clients of the framework
* and is expected to be maintained by caller of TI SCI protocol library.
*
* Return: 0 if all went fine, else corresponding error.
*/
const struct ti_sci_handle *devm_ti_sci_get_handle(struct device *dev)
{
const struct ti_sci_handle **ptr;
const struct ti_sci_handle *handle;
ptr = devres_alloc(devm_ti_sci_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
handle = ti_sci_get_handle(dev);
if (!IS_ERR(handle)) {
*ptr = handle;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return handle;
}
EXPORT_SYMBOL_GPL(devm_ti_sci_get_handle);
static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode,
void *cmd)
{
struct ti_sci_info *info = reboot_to_ti_sci_info(nb);
const struct ti_sci_handle *handle = &info->handle;
ti_sci_cmd_core_reboot(handle);
/* call fail OR pass, we should not be here in the first place */
return NOTIFY_BAD;
}
/* Description for K2G */
static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
.host_id = 2,
/* Conservative duration */
.max_rx_timeout_ms = 1000,
/* Limited by MBOX_TX_QUEUE_LEN. K2G can handle upto 128 messages! */
.max_msgs = 20,
.max_msg_size = 64,
};
static const struct of_device_id ti_sci_of_match[] = {
{.compatible = "ti,k2g-sci", .data = &ti_sci_pmmc_k2g_desc},
{ /* Sentinel */ },
};
MODULE_DEVICE_TABLE(of, ti_sci_of_match);
static int ti_sci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct of_device_id *of_id;
const struct ti_sci_desc *desc;
struct ti_sci_xfer *xfer;
struct ti_sci_info *info = NULL;
struct ti_sci_xfers_info *minfo;
struct mbox_client *cl;
int ret = -EINVAL;
int i;
int reboot = 0;
of_id = of_match_device(ti_sci_of_match, dev);
if (!of_id) {
dev_err(dev, "OF data missing\n");
return -EINVAL;
}
desc = of_id->data;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = dev;
info->desc = desc;
reboot = of_property_read_bool(dev->of_node,
"ti,system-reboot-controller");
INIT_LIST_HEAD(&info->node);
minfo = &info->minfo;
/*
* Pre-allocate messages
* NEVER allocate more than what we can indicate in hdr.seq
* if we have data description bug, force a fix..
*/
if (WARN_ON(desc->max_msgs >=
1 << 8 * sizeof(((struct ti_sci_msg_hdr *)0)->seq)))
return -EINVAL;
minfo->xfer_block = devm_kcalloc(dev,
desc->max_msgs,
sizeof(*minfo->xfer_block),
GFP_KERNEL);
if (!minfo->xfer_block)
return -ENOMEM;
minfo->xfer_alloc_table = devm_kzalloc(dev,
BITS_TO_LONGS(desc->max_msgs)
* sizeof(unsigned long),
GFP_KERNEL);
if (!minfo->xfer_alloc_table)
return -ENOMEM;
bitmap_zero(minfo->xfer_alloc_table, desc->max_msgs);
/* Pre-initialize the buffer pointer to pre-allocated buffers */
for (i = 0, xfer = minfo->xfer_block; i < desc->max_msgs; i++, xfer++) {
xfer->xfer_buf = devm_kcalloc(dev, 1, desc->max_msg_size,
GFP_KERNEL);
if (!xfer->xfer_buf)
return -ENOMEM;
xfer->tx_message.buf = xfer->xfer_buf;
init_completion(&xfer->done);
}
ret = ti_sci_debugfs_create(pdev, info);
if (ret)
dev_warn(dev, "Failed to create debug file\n");
platform_set_drvdata(pdev, info);
cl = &info->cl;
cl->dev = dev;
cl->tx_block = false;
cl->rx_callback = ti_sci_rx_callback;
cl->knows_txdone = true;
spin_lock_init(&minfo->xfer_lock);
sema_init(&minfo->sem_xfer_count, desc->max_msgs);
info->chan_rx = mbox_request_channel_byname(cl, "rx");
if (IS_ERR(info->chan_rx)) {
ret = PTR_ERR(info->chan_rx);
goto out;
}
info->chan_tx = mbox_request_channel_byname(cl, "tx");
if (IS_ERR(info->chan_tx)) {
ret = PTR_ERR(info->chan_tx);
goto out;
}
ret = ti_sci_cmd_get_revision(info);
if (ret) {
dev_err(dev, "Unable to communicate with TISCI(%d)\n", ret);
goto out;
}
ti_sci_setup_ops(info);
if (reboot) {
info->nb.notifier_call = tisci_reboot_handler;
info->nb.priority = 128;
ret = register_restart_handler(&info->nb);
if (ret) {
dev_err(dev, "reboot registration fail(%d)\n", ret);
return ret;
}
}
dev_info(dev, "ABI: %d.%d (firmware rev 0x%04x '%s')\n",
info->handle.version.abi_major, info->handle.version.abi_minor,
info->handle.version.firmware_revision,
info->handle.version.firmware_description);
mutex_lock(&ti_sci_list_mutex);
list_add_tail(&info->node, &ti_sci_list);
mutex_unlock(&ti_sci_list_mutex);
return of_platform_populate(dev->of_node, NULL, NULL, dev);
out:
if (!IS_ERR(info->chan_tx))
mbox_free_channel(info->chan_tx);
if (!IS_ERR(info->chan_rx))
mbox_free_channel(info->chan_rx);
debugfs_remove(info->d);
return ret;
}
static int ti_sci_remove(struct platform_device *pdev)
{
struct ti_sci_info *info;
struct device *dev = &pdev->dev;
int ret = 0;
of_platform_depopulate(dev);
info = platform_get_drvdata(pdev);
if (info->nb.notifier_call)
unregister_restart_handler(&info->nb);
mutex_lock(&ti_sci_list_mutex);
if (info->users)
ret = -EBUSY;
else
list_del(&info->node);
mutex_unlock(&ti_sci_list_mutex);
if (!ret) {
ti_sci_debugfs_destroy(pdev, info);
/* Safe to free channels since no more users */
mbox_free_channel(info->chan_tx);
mbox_free_channel(info->chan_rx);
}
return ret;
}
static struct platform_driver ti_sci_driver = {
.probe = ti_sci_probe,
.remove = ti_sci_remove,
.driver = {
.name = "ti-sci",
.of_match_table = of_match_ptr(ti_sci_of_match),
},
};
module_platform_driver(ti_sci_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI System Control Interface(SCI) driver");
MODULE_AUTHOR("Nishanth Menon");
MODULE_ALIAS("platform:ti-sci");
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