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OpenCloudOS-Kernel/drivers/hid/intel-ish-hid/ishtp-fw-loader.c

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// SPDX-License-Identifier: GPL-2.0
/*
* ISH-TP client driver for ISH firmware loading
*
* Copyright (c) 2019, Intel Corporation.
*/
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/intel-ish-client-if.h>
#include <linux/property.h>
#include <asm/cacheflush.h>
/* Number of times we attempt to load the firmware before giving up */
#define MAX_LOAD_ATTEMPTS 3
/* ISH TX/RX ring buffer pool size */
#define LOADER_CL_RX_RING_SIZE 1
#define LOADER_CL_TX_RING_SIZE 1
/*
* ISH Shim firmware loader reserves 4 Kb buffer in SRAM. The buffer is
* used to temporarily hold the data transferred from host to Shim
* firmware loader. Reason for the odd size of 3968 bytes? Each IPC
* transfer is 128 bytes (= 4 bytes header + 124 bytes payload). So the
* 4 Kb buffer can hold maximum of 32 IPC transfers, which means we can
* have a max payload of 3968 bytes (= 32 x 124 payload).
*/
#define LOADER_SHIM_IPC_BUF_SIZE 3968
/**
* enum ish_loader_commands - ISH loader host commands.
* LOADER_CMD_XFER_QUERY Query the Shim firmware loader for
* capabilities
* LOADER_CMD_XFER_FRAGMENT Transfer one firmware image fragment at a
* time. The command may be executed
* multiple times until the entire firmware
* image is downloaded to SRAM.
* LOADER_CMD_START Start executing the main firmware.
*/
enum ish_loader_commands {
LOADER_CMD_XFER_QUERY = 0,
LOADER_CMD_XFER_FRAGMENT,
LOADER_CMD_START,
};
/* Command bit mask */
#define CMD_MASK GENMASK(6, 0)
#define IS_RESPONSE BIT(7)
/*
* ISH firmware max delay for one transmit failure is 1 Hz,
* and firmware will retry 2 times, so 3 Hz is used for timeout.
*/
#define ISHTP_SEND_TIMEOUT (3 * HZ)
/*
* Loader transfer modes:
*
* LOADER_XFER_MODE_ISHTP mode uses the existing ISH-TP mechanism to
* transfer data. This may use IPC or DMA if supported in firmware.
* The buffer size is limited to 4 Kb by the IPC/ISH-TP protocol for
* both IPC & DMA (legacy).
*
* LOADER_XFER_MODE_DIRECT_DMA - firmware loading is a bit different
* from the sensor data streaming. Here we download a large (300+ Kb)
* image directly to ISH SRAM memory. There is limited benefit of
* DMA'ing 300 Kb image in 4 Kb chucks limit. Hence, we introduce
* this "direct dma" mode, where we do not use ISH-TP for DMA, but
* instead manage the DMA directly in kernel driver and Shim firmware
* loader (allocate buffer, break in chucks and transfer). This allows
* to overcome 4 Kb limit, and optimize the data flow path in firmware.
*/
#define LOADER_XFER_MODE_DIRECT_DMA BIT(0)
#define LOADER_XFER_MODE_ISHTP BIT(1)
/* ISH Transport Loader client unique GUID */
static const guid_t loader_ishtp_guid =
GUID_INIT(0xc804d06a, 0x55bd, 0x4ea7,
0xad, 0xed, 0x1e, 0x31, 0x22, 0x8c, 0x76, 0xdc);
#define FILENAME_SIZE 256
/*
* The firmware loading latency will be minimum if we can DMA the
* entire ISH firmware image in one go. This requires that we allocate
* a large DMA buffer in kernel, which could be problematic on some
* platforms. So here we limit the DMA buffer size via a module_param.
* We default to 4 pages, but a customer can set it to higher limit if
* deemed appropriate for his platform.
*/
static int dma_buf_size_limit = 4 * PAGE_SIZE;
/**
* struct loader_msg_hdr - Header for ISH Loader commands.
* @command: LOADER_CMD* commands. Bit 7 is the response.
* @status: Command response status. Non 0, is error
* condition.
*
* This structure is used as header for every command/data sent/received
* between Host driver and ISH Shim firmware loader.
*/
struct loader_msg_hdr {
u8 command;
u8 reserved[2];
u8 status;
} __packed;
struct loader_xfer_query {
struct loader_msg_hdr hdr;
u32 image_size;
} __packed;
struct ish_fw_version {
u16 major;
u16 minor;
u16 hotfix;
u16 build;
} __packed;
union loader_version {
u32 value;
struct {
u8 major;
u8 minor;
u8 hotfix;
u8 build;
};
} __packed;
struct loader_capability {
u32 max_fw_image_size;
u32 xfer_mode;
u32 max_dma_buf_size; /* only for dma mode, multiples of cacheline */
} __packed;
struct shim_fw_info {
struct ish_fw_version ish_fw_version;
u32 protocol_version;
union loader_version ldr_version;
struct loader_capability ldr_capability;
} __packed;
struct loader_xfer_query_response {
struct loader_msg_hdr hdr;
struct shim_fw_info fw_info;
} __packed;
struct loader_xfer_fragment {
struct loader_msg_hdr hdr;
u32 xfer_mode;
u32 offset;
u32 size;
u32 is_last;
} __packed;
struct loader_xfer_ipc_fragment {
struct loader_xfer_fragment fragment;
u8 data[] ____cacheline_aligned; /* variable length payload here */
} __packed;
struct loader_xfer_dma_fragment {
struct loader_xfer_fragment fragment;
u64 ddr_phys_addr;
} __packed;
struct loader_start {
struct loader_msg_hdr hdr;
} __packed;
/**
* struct response_info - Encapsulate firmware response related
* information for passing between function
* loader_cl_send() and process_recv() callback.
* @data Copy the data received from firmware here.
* @max_size Max size allocated for the @data buffer. If the
* received data exceeds this value, we log an
* error.
* @size Actual size of data received from firmware.
* @error Returns 0 for success, negative error code for a
* failure in function process_recv().
* @received Set to true on receiving a valid firmware
* response to host command
* @wait_queue Wait queue for Host firmware loading where the
* client sends message to ISH firmware and waits
* for response
*/
struct response_info {
void *data;
size_t max_size;
size_t size;
int error;
bool received;
wait_queue_head_t wait_queue;
};
/**
* struct ishtp_cl_data - Encapsulate per ISH-TP Client Data.
* @work_ishtp_reset: Work queue for reset handling.
* @work_fw_load: Work queue for host firmware loading.
* @flag_retry Flag for indicating host firmware loading should
* be retried.
* @retry_count Count the number of retries.
*
* This structure is used to store data per client.
*/
struct ishtp_cl_data {
struct ishtp_cl *loader_ishtp_cl;
struct ishtp_cl_device *cl_device;
/*
* Used for passing firmware response information between
* loader_cl_send() and process_recv() callback.
*/
struct response_info response;
struct work_struct work_ishtp_reset;
struct work_struct work_fw_load;
/*
* In certain failure scenrios, it makes sense to reset the ISH
* subsystem and retry Host firmware loading (e.g. bad message
* packet, ENOMEM, etc.). On the other hand, failures due to
* protocol mismatch, etc., are not recoverable. We do not
* retry them.
*
* If set, the flag indicates that we should re-try the
* particular failure.
*/
bool flag_retry;
int retry_count;
};
#define IPC_FRAGMENT_DATA_PREAMBLE \
offsetof(struct loader_xfer_ipc_fragment, data)
#define cl_data_to_dev(client_data) ishtp_device((client_data)->cl_device)
/**
* get_firmware_variant() - Gets the filename of firmware image to be
* loaded based on platform variant.
* @client_data Client data instance.
* @filename Returns firmware filename.
*
* Queries the firmware-name device property string.
*
* Return: 0 for success, negative error code for failure.
*/
static int get_firmware_variant(struct ishtp_cl_data *client_data,
char *filename)
{
int rv;
const char *val;
struct device *devc = ishtp_get_pci_device(client_data->cl_device);
rv = device_property_read_string(devc, "firmware-name", &val);
if (rv < 0) {
dev_err(devc,
"Error: ISH firmware-name device property required\n");
return rv;
}
return snprintf(filename, FILENAME_SIZE, "intel/%s", val);
}
/**
* loader_cl_send() Send message from host to firmware
* @client_data: Client data instance
* @out_msg Message buffer to be sent to firmware
* @out_size Size of out going message
* @in_msg Message buffer where the incoming data copied.
* This buffer is allocated by calling
* @in_size Max size of incoming message
*
* Return: Number of bytes copied in the in_msg on success, negative
* error code on failure.
*/
static int loader_cl_send(struct ishtp_cl_data *client_data,
u8 *out_msg, size_t out_size,
u8 *in_msg, size_t in_size)
{
int rv;
struct loader_msg_hdr *out_hdr = (struct loader_msg_hdr *)out_msg;
struct ishtp_cl *loader_ishtp_cl = client_data->loader_ishtp_cl;
dev_dbg(cl_data_to_dev(client_data),
"%s: command=%02lx is_response=%u status=%02x\n",
__func__,
out_hdr->command & CMD_MASK,
out_hdr->command & IS_RESPONSE ? 1 : 0,
out_hdr->status);
/* Setup in coming buffer & size */
client_data->response.data = in_msg;
client_data->response.max_size = in_size;
client_data->response.error = 0;
client_data->response.received = false;
rv = ishtp_cl_send(loader_ishtp_cl, out_msg, out_size);
if (rv < 0) {
dev_err(cl_data_to_dev(client_data),
"ishtp_cl_send error %d\n", rv);
return rv;
}
wait_event_interruptible_timeout(client_data->response.wait_queue,
client_data->response.received,
ISHTP_SEND_TIMEOUT);
if (!client_data->response.received) {
dev_err(cl_data_to_dev(client_data),
"Timed out for response to command=%02lx",
out_hdr->command & CMD_MASK);
return -ETIMEDOUT;
}
if (client_data->response.error < 0)
return client_data->response.error;
return client_data->response.size;
}
/**
* process_recv() - Receive and parse incoming packet
* @loader_ishtp_cl: Client instance to get stats
* @rb_in_proc: ISH received message buffer
*
* Parse the incoming packet. If it is a response packet then it will
* update received and wake up the caller waiting to for the response.
*/
static void process_recv(struct ishtp_cl *loader_ishtp_cl,
struct ishtp_cl_rb *rb_in_proc)
{
struct loader_msg_hdr *hdr;
size_t data_len = rb_in_proc->buf_idx;
struct ishtp_cl_data *client_data =
ishtp_get_client_data(loader_ishtp_cl);
/* Sanity check */
if (!client_data->response.data) {
dev_err(cl_data_to_dev(client_data),
"Receiving buffer is null. Should be allocated by calling function\n");
client_data->response.error = -EINVAL;
goto end;
}
if (client_data->response.received) {
dev_err(cl_data_to_dev(client_data),
"Previous firmware message not yet processed\n");
client_data->response.error = -EINVAL;
goto end;
}
/*
* All firmware messages have a header. Check buffer size
* before accessing elements inside.
*/
if (!rb_in_proc->buffer.data) {
dev_warn(cl_data_to_dev(client_data),
"rb_in_proc->buffer.data returned null");
client_data->response.error = -EBADMSG;
goto end;
}
if (data_len < sizeof(struct loader_msg_hdr)) {
dev_err(cl_data_to_dev(client_data),
"data size %zu is less than header %zu\n",
data_len, sizeof(struct loader_msg_hdr));
client_data->response.error = -EMSGSIZE;
goto end;
}
hdr = (struct loader_msg_hdr *)rb_in_proc->buffer.data;
dev_dbg(cl_data_to_dev(client_data),
"%s: command=%02lx is_response=%u status=%02x\n",
__func__,
hdr->command & CMD_MASK,
hdr->command & IS_RESPONSE ? 1 : 0,
hdr->status);
if (((hdr->command & CMD_MASK) != LOADER_CMD_XFER_QUERY) &&
((hdr->command & CMD_MASK) != LOADER_CMD_XFER_FRAGMENT) &&
((hdr->command & CMD_MASK) != LOADER_CMD_START)) {
dev_err(cl_data_to_dev(client_data),
"Invalid command=%02lx\n",
hdr->command & CMD_MASK);
client_data->response.error = -EPROTO;
goto end;
}
if (data_len > client_data->response.max_size) {
dev_err(cl_data_to_dev(client_data),
"Received buffer size %zu is larger than allocated buffer %zu\n",
data_len, client_data->response.max_size);
client_data->response.error = -EMSGSIZE;
goto end;
}
/* We expect only "response" messages from firmware */
if (!(hdr->command & IS_RESPONSE)) {
dev_err(cl_data_to_dev(client_data),
"Invalid response to command\n");
client_data->response.error = -EIO;
goto end;
}
if (hdr->status) {
dev_err(cl_data_to_dev(client_data),
"Loader returned status %d\n",
hdr->status);
client_data->response.error = -EIO;
goto end;
}
/* Update the actual received buffer size */
client_data->response.size = data_len;
/*
* Copy the buffer received in firmware response for the
* calling thread.
*/
memcpy(client_data->response.data,
rb_in_proc->buffer.data, data_len);
/* Set flag before waking up the caller */
client_data->response.received = true;
end:
/* Free the buffer */
ishtp_cl_io_rb_recycle(rb_in_proc);
rb_in_proc = NULL;
/* Wake the calling thread */
wake_up_interruptible(&client_data->response.wait_queue);
}
/**
* loader_cl_event_cb() - bus driver callback for incoming message
* @device: Pointer to the ishtp client device for which this
* message is targeted
*
* Remove the packet from the list and process the message by calling
* process_recv
*/
static void loader_cl_event_cb(struct ishtp_cl_device *cl_device)
{
struct ishtp_cl_rb *rb_in_proc;
struct ishtp_cl *loader_ishtp_cl = ishtp_get_drvdata(cl_device);
while ((rb_in_proc = ishtp_cl_rx_get_rb(loader_ishtp_cl)) != NULL) {
/* Process the data packet from firmware */
process_recv(loader_ishtp_cl, rb_in_proc);
}
}
/**
* ish_query_loader_prop() - Query ISH Shim firmware loader
* @client_data: Client data instance
* @fw: Poiner to firmware data struct in host memory
* @fw_info: Loader firmware properties
*
* This function queries the ISH Shim firmware loader for capabilities.
*
* Return: 0 for success, negative error code for failure.
*/
static int ish_query_loader_prop(struct ishtp_cl_data *client_data,
const struct firmware *fw,
struct shim_fw_info *fw_info)
{
int rv;
struct loader_xfer_query ldr_xfer_query;
struct loader_xfer_query_response ldr_xfer_query_resp;
memset(&ldr_xfer_query, 0, sizeof(ldr_xfer_query));
ldr_xfer_query.hdr.command = LOADER_CMD_XFER_QUERY;
ldr_xfer_query.image_size = fw->size;
rv = loader_cl_send(client_data,
(u8 *)&ldr_xfer_query,
sizeof(ldr_xfer_query),
(u8 *)&ldr_xfer_query_resp,
sizeof(ldr_xfer_query_resp));
if (rv < 0) {
client_data->flag_retry = true;
*fw_info = (struct shim_fw_info){};
return rv;
}
/* On success, the return value is the received buffer size */
if (rv != sizeof(struct loader_xfer_query_response)) {
dev_err(cl_data_to_dev(client_data),
"data size %d is not equal to size of loader_xfer_query_response %zu\n",
rv, sizeof(struct loader_xfer_query_response));
client_data->flag_retry = true;
*fw_info = (struct shim_fw_info){};
return -EMSGSIZE;
}
/* Save fw_info for use outside this function */
*fw_info = ldr_xfer_query_resp.fw_info;
/* Loader firmware properties */
dev_dbg(cl_data_to_dev(client_data),
"ish_fw_version: major=%d minor=%d hotfix=%d build=%d protocol_version=0x%x loader_version=%d\n",
fw_info->ish_fw_version.major,
fw_info->ish_fw_version.minor,
fw_info->ish_fw_version.hotfix,
fw_info->ish_fw_version.build,
fw_info->protocol_version,
fw_info->ldr_version.value);
dev_dbg(cl_data_to_dev(client_data),
"loader_capability: max_fw_image_size=0x%x xfer_mode=%d max_dma_buf_size=0x%x dma_buf_size_limit=0x%x\n",
fw_info->ldr_capability.max_fw_image_size,
fw_info->ldr_capability.xfer_mode,
fw_info->ldr_capability.max_dma_buf_size,
dma_buf_size_limit);
/* Sanity checks */
if (fw_info->ldr_capability.max_fw_image_size < fw->size) {
dev_err(cl_data_to_dev(client_data),
"ISH firmware size %zu is greater than Shim firmware loader max supported %d\n",
fw->size,
fw_info->ldr_capability.max_fw_image_size);
return -ENOSPC;
}
/* For DMA the buffer size should be multiple of cacheline size */
if ((fw_info->ldr_capability.xfer_mode & LOADER_XFER_MODE_DIRECT_DMA) &&
(fw_info->ldr_capability.max_dma_buf_size % L1_CACHE_BYTES)) {
dev_err(cl_data_to_dev(client_data),
"Shim firmware loader buffer size %d should be multiple of cacheline\n",
fw_info->ldr_capability.max_dma_buf_size);
return -EINVAL;
}
return 0;
}
/**
* ish_fw_xfer_ishtp() Loads ISH firmware using ishtp interface
* @client_data: Client data instance
* @fw: Pointer to firmware data struct in host memory
*
* This function uses ISH-TP to transfer ISH firmware from host to
* ISH SRAM. Lower layers may use IPC or DMA depending on firmware
* support.
*
* Return: 0 for success, negative error code for failure.
*/
static int ish_fw_xfer_ishtp(struct ishtp_cl_data *client_data,
const struct firmware *fw)
{
int rv;
u32 fragment_offset, fragment_size, payload_max_size;
struct loader_xfer_ipc_fragment *ldr_xfer_ipc_frag;
struct loader_msg_hdr ldr_xfer_ipc_ack;
payload_max_size =
LOADER_SHIM_IPC_BUF_SIZE - IPC_FRAGMENT_DATA_PREAMBLE;
ldr_xfer_ipc_frag = kzalloc(LOADER_SHIM_IPC_BUF_SIZE, GFP_KERNEL);
if (!ldr_xfer_ipc_frag) {
client_data->flag_retry = true;
return -ENOMEM;
}
ldr_xfer_ipc_frag->fragment.hdr.command = LOADER_CMD_XFER_FRAGMENT;
ldr_xfer_ipc_frag->fragment.xfer_mode = LOADER_XFER_MODE_ISHTP;
/* Break the firmware image into fragments and send as ISH-TP payload */
fragment_offset = 0;
while (fragment_offset < fw->size) {
if (fragment_offset + payload_max_size < fw->size) {
fragment_size = payload_max_size;
ldr_xfer_ipc_frag->fragment.is_last = 0;
} else {
fragment_size = fw->size - fragment_offset;
ldr_xfer_ipc_frag->fragment.is_last = 1;
}
ldr_xfer_ipc_frag->fragment.offset = fragment_offset;
ldr_xfer_ipc_frag->fragment.size = fragment_size;
memcpy(ldr_xfer_ipc_frag->data,
&fw->data[fragment_offset],
fragment_size);
dev_dbg(cl_data_to_dev(client_data),
"xfer_mode=ipc offset=0x%08x size=0x%08x is_last=%d\n",
ldr_xfer_ipc_frag->fragment.offset,
ldr_xfer_ipc_frag->fragment.size,
ldr_xfer_ipc_frag->fragment.is_last);
rv = loader_cl_send(client_data,
(u8 *)ldr_xfer_ipc_frag,
IPC_FRAGMENT_DATA_PREAMBLE + fragment_size,
(u8 *)&ldr_xfer_ipc_ack,
sizeof(ldr_xfer_ipc_ack));
if (rv < 0) {
client_data->flag_retry = true;
goto end_err_resp_buf_release;
}
fragment_offset += fragment_size;
}
kfree(ldr_xfer_ipc_frag);
return 0;
end_err_resp_buf_release:
/* Free ISH buffer if not done already, in error case */
kfree(ldr_xfer_ipc_frag);
return rv;
}
/**
* ish_fw_xfer_direct_dma() - Loads ISH firmware using direct dma
* @client_data: Client data instance
* @fw: Pointer to firmware data struct in host memory
* @fw_info: Loader firmware properties
*
* Host firmware load is a unique case where we need to download
* a large firmware image (200+ Kb). This function implements
* direct DMA transfer in kernel and ISH firmware. This allows
* us to overcome the ISH-TP 4 Kb limit, and allows us to DMA
* directly to ISH UMA at location of choice.
* Function depends on corresponding support in ISH firmware.
*
* Return: 0 for success, negative error code for failure.
*/
static int ish_fw_xfer_direct_dma(struct ishtp_cl_data *client_data,
const struct firmware *fw,
const struct shim_fw_info fw_info)
{
int rv;
void *dma_buf;
dma_addr_t dma_buf_phy;
u32 fragment_offset, fragment_size, payload_max_size;
struct loader_msg_hdr ldr_xfer_dma_frag_ack;
struct loader_xfer_dma_fragment ldr_xfer_dma_frag;
struct device *devc = ishtp_get_pci_device(client_data->cl_device);
u32 shim_fw_buf_size =
fw_info.ldr_capability.max_dma_buf_size;
/*
* payload_max_size should be set to minimum of
* (1) Size of firmware to be loaded,
* (2) Max DMA buffer size supported by Shim firmware,
* (3) DMA buffer size limit set by boot_param dma_buf_size_limit.
*/
payload_max_size = min3(fw->size,
(size_t)shim_fw_buf_size,
(size_t)dma_buf_size_limit);
/*
* Buffer size should be multiple of cacheline size
* if it's not, select the previous cacheline boundary.
*/
payload_max_size &= ~(L1_CACHE_BYTES - 1);
dma_buf = dma_alloc_coherent(devc, payload_max_size, &dma_buf_phy, GFP_KERNEL);
if (!dma_buf) {
client_data->flag_retry = true;
return -ENOMEM;
}
ldr_xfer_dma_frag.fragment.hdr.command = LOADER_CMD_XFER_FRAGMENT;
ldr_xfer_dma_frag.fragment.xfer_mode = LOADER_XFER_MODE_DIRECT_DMA;
ldr_xfer_dma_frag.ddr_phys_addr = (u64)dma_buf_phy;
/* Send the firmware image in chucks of payload_max_size */
fragment_offset = 0;
while (fragment_offset < fw->size) {
if (fragment_offset + payload_max_size < fw->size) {
fragment_size = payload_max_size;
ldr_xfer_dma_frag.fragment.is_last = 0;
} else {
fragment_size = fw->size - fragment_offset;
ldr_xfer_dma_frag.fragment.is_last = 1;
}
ldr_xfer_dma_frag.fragment.offset = fragment_offset;
ldr_xfer_dma_frag.fragment.size = fragment_size;
memcpy(dma_buf, &fw->data[fragment_offset], fragment_size);
/* Flush cache to be sure the data is in main memory. */
clflush_cache_range(dma_buf, payload_max_size);
dev_dbg(cl_data_to_dev(client_data),
"xfer_mode=dma offset=0x%08x size=0x%x is_last=%d ddr_phys_addr=0x%016llx\n",
ldr_xfer_dma_frag.fragment.offset,
ldr_xfer_dma_frag.fragment.size,
ldr_xfer_dma_frag.fragment.is_last,
ldr_xfer_dma_frag.ddr_phys_addr);
rv = loader_cl_send(client_data,
(u8 *)&ldr_xfer_dma_frag,
sizeof(ldr_xfer_dma_frag),
(u8 *)&ldr_xfer_dma_frag_ack,
sizeof(ldr_xfer_dma_frag_ack));
if (rv < 0) {
client_data->flag_retry = true;
goto end_err_resp_buf_release;
}
fragment_offset += fragment_size;
}
end_err_resp_buf_release:
dma_free_coherent(devc, payload_max_size, dma_buf, dma_buf_phy);
return rv;
}
/**
* ish_fw_start() Start executing ISH main firmware
* @client_data: client data instance
*
* This function sends message to Shim firmware loader to start
* the execution of ISH main firmware.
*
* Return: 0 for success, negative error code for failure.
*/
static int ish_fw_start(struct ishtp_cl_data *client_data)
{
struct loader_start ldr_start;
struct loader_msg_hdr ldr_start_ack;
memset(&ldr_start, 0, sizeof(ldr_start));
ldr_start.hdr.command = LOADER_CMD_START;
return loader_cl_send(client_data,
(u8 *)&ldr_start,
sizeof(ldr_start),
(u8 *)&ldr_start_ack,
sizeof(ldr_start_ack));
}
/**
* load_fw_from_host() Loads ISH firmware from host
* @client_data: Client data instance
*
* This function loads the ISH firmware to ISH SRAM and starts execution
*
* Return: 0 for success, negative error code for failure.
*/
static int load_fw_from_host(struct ishtp_cl_data *client_data)
{
int rv;
u32 xfer_mode;
char *filename;
const struct firmware *fw;
struct shim_fw_info fw_info;
struct ishtp_cl *loader_ishtp_cl = client_data->loader_ishtp_cl;
client_data->flag_retry = false;
filename = kzalloc(FILENAME_SIZE, GFP_KERNEL);
if (!filename) {
client_data->flag_retry = true;
rv = -ENOMEM;
goto end_error;
}
/* Get filename of the ISH firmware to be loaded */
rv = get_firmware_variant(client_data, filename);
if (rv < 0)
goto end_err_filename_buf_release;
rv = request_firmware(&fw, filename, cl_data_to_dev(client_data));
if (rv < 0)
goto end_err_filename_buf_release;
/* Step 1: Query Shim firmware loader properties */
rv = ish_query_loader_prop(client_data, fw, &fw_info);
if (rv < 0)
goto end_err_fw_release;
/* Step 2: Send the main firmware image to be loaded, to ISH SRAM */
xfer_mode = fw_info.ldr_capability.xfer_mode;
if (xfer_mode & LOADER_XFER_MODE_DIRECT_DMA) {
rv = ish_fw_xfer_direct_dma(client_data, fw, fw_info);
} else if (xfer_mode & LOADER_XFER_MODE_ISHTP) {
rv = ish_fw_xfer_ishtp(client_data, fw);
} else {
dev_err(cl_data_to_dev(client_data),
"No transfer mode selected in firmware\n");
rv = -EINVAL;
}
if (rv < 0)
goto end_err_fw_release;
/* Step 3: Start ISH main firmware exeuction */
rv = ish_fw_start(client_data);
if (rv < 0)
goto end_err_fw_release;
release_firmware(fw);
dev_info(cl_data_to_dev(client_data), "ISH firmware %s loaded\n",
filename);
kfree(filename);
return 0;
end_err_fw_release:
release_firmware(fw);
end_err_filename_buf_release:
kfree(filename);
end_error:
/* Keep a count of retries, and give up after 3 attempts */
if (client_data->flag_retry &&
client_data->retry_count++ < MAX_LOAD_ATTEMPTS) {
dev_warn(cl_data_to_dev(client_data),
"ISH host firmware load failed %d. Resetting ISH, and trying again..\n",
rv);
ish_hw_reset(ishtp_get_ishtp_device(loader_ishtp_cl));
} else {
dev_err(cl_data_to_dev(client_data),
"ISH host firmware load failed %d\n", rv);
}
return rv;
}
static void load_fw_from_host_handler(struct work_struct *work)
{
struct ishtp_cl_data *client_data;
client_data = container_of(work, struct ishtp_cl_data,
work_fw_load);
load_fw_from_host(client_data);
}
/**
* loader_init() - Init function for ISH-TP client
* @loader_ishtp_cl: ISH-TP client instance
* @reset: true if called for init after reset
*
* Return: 0 for success, negative error code for failure
*/
static int loader_init(struct ishtp_cl *loader_ishtp_cl, int reset)
{
int rv;
struct ishtp_fw_client *fw_client;
struct ishtp_cl_data *client_data =
ishtp_get_client_data(loader_ishtp_cl);
dev_dbg(cl_data_to_dev(client_data), "reset flag: %d\n", reset);
rv = ishtp_cl_link(loader_ishtp_cl);
if (rv < 0) {
dev_err(cl_data_to_dev(client_data), "ishtp_cl_link failed\n");
return rv;
}
/* Connect to firmware client */
ishtp_set_tx_ring_size(loader_ishtp_cl, LOADER_CL_TX_RING_SIZE);
ishtp_set_rx_ring_size(loader_ishtp_cl, LOADER_CL_RX_RING_SIZE);
fw_client =
ishtp_fw_cl_get_client(ishtp_get_ishtp_device(loader_ishtp_cl),
&loader_ishtp_guid);
if (!fw_client) {
dev_err(cl_data_to_dev(client_data),
"ISH client uuid not found\n");
rv = -ENOENT;
goto err_cl_unlink;
}
ishtp_cl_set_fw_client_id(loader_ishtp_cl,
ishtp_get_fw_client_id(fw_client));
ishtp_set_connection_state(loader_ishtp_cl, ISHTP_CL_CONNECTING);
rv = ishtp_cl_connect(loader_ishtp_cl);
if (rv < 0) {
dev_err(cl_data_to_dev(client_data), "Client connect fail\n");
goto err_cl_unlink;
}
dev_dbg(cl_data_to_dev(client_data), "Client connected\n");
ishtp_register_event_cb(client_data->cl_device, loader_cl_event_cb);
return 0;
err_cl_unlink:
ishtp_cl_unlink(loader_ishtp_cl);
return rv;
}
static void loader_deinit(struct ishtp_cl *loader_ishtp_cl)
{
ishtp_set_connection_state(loader_ishtp_cl, ISHTP_CL_DISCONNECTING);
ishtp_cl_disconnect(loader_ishtp_cl);
ishtp_cl_unlink(loader_ishtp_cl);
ishtp_cl_flush_queues(loader_ishtp_cl);
/* Disband and free all Tx and Rx client-level rings */
ishtp_cl_free(loader_ishtp_cl);
}
static void reset_handler(struct work_struct *work)
{
int rv;
struct ishtp_cl_data *client_data;
struct ishtp_cl *loader_ishtp_cl;
struct ishtp_cl_device *cl_device;
client_data = container_of(work, struct ishtp_cl_data,
work_ishtp_reset);
loader_ishtp_cl = client_data->loader_ishtp_cl;
cl_device = client_data->cl_device;
/* Unlink, flush queues & start again */
ishtp_cl_unlink(loader_ishtp_cl);
ishtp_cl_flush_queues(loader_ishtp_cl);
ishtp_cl_free(loader_ishtp_cl);
loader_ishtp_cl = ishtp_cl_allocate(cl_device);
if (!loader_ishtp_cl)
return;
ishtp_set_drvdata(cl_device, loader_ishtp_cl);
ishtp_set_client_data(loader_ishtp_cl, client_data);
client_data->loader_ishtp_cl = loader_ishtp_cl;
client_data->cl_device = cl_device;
rv = loader_init(loader_ishtp_cl, 1);
if (rv < 0) {
dev_err(ishtp_device(cl_device), "Reset Failed\n");
return;
}
/* ISH firmware loading from host */
load_fw_from_host(client_data);
}
/**
* loader_ishtp_cl_probe() - ISH-TP client driver probe
* @cl_device: ISH-TP client device instance
*
* This function gets called on device create on ISH-TP bus
*
* Return: 0 for success, negative error code for failure
*/
static int loader_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
{
struct ishtp_cl *loader_ishtp_cl;
struct ishtp_cl_data *client_data;
int rv;
client_data = devm_kzalloc(ishtp_device(cl_device),
sizeof(*client_data),
GFP_KERNEL);
if (!client_data)
return -ENOMEM;
loader_ishtp_cl = ishtp_cl_allocate(cl_device);
if (!loader_ishtp_cl)
return -ENOMEM;
ishtp_set_drvdata(cl_device, loader_ishtp_cl);
ishtp_set_client_data(loader_ishtp_cl, client_data);
client_data->loader_ishtp_cl = loader_ishtp_cl;
client_data->cl_device = cl_device;
init_waitqueue_head(&client_data->response.wait_queue);
INIT_WORK(&client_data->work_ishtp_reset,
reset_handler);
INIT_WORK(&client_data->work_fw_load,
load_fw_from_host_handler);
rv = loader_init(loader_ishtp_cl, 0);
if (rv < 0) {
ishtp_cl_free(loader_ishtp_cl);
return rv;
}
ishtp_get_device(cl_device);
client_data->retry_count = 0;
/* ISH firmware loading from host */
schedule_work(&client_data->work_fw_load);
return 0;
}
/**
* loader_ishtp_cl_remove() - ISH-TP client driver remove
* @cl_device: ISH-TP client device instance
*
* This function gets called on device remove on ISH-TP bus
*
* Return: 0
*/
static int loader_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
{
struct ishtp_cl_data *client_data;
struct ishtp_cl *loader_ishtp_cl = ishtp_get_drvdata(cl_device);
client_data = ishtp_get_client_data(loader_ishtp_cl);
/*
* The sequence of the following two cancel_work_sync() is
* important. The work_fw_load can in turn schedue
* work_ishtp_reset, so first cancel work_fw_load then
* cancel work_ishtp_reset.
*/
cancel_work_sync(&client_data->work_fw_load);
cancel_work_sync(&client_data->work_ishtp_reset);
loader_deinit(loader_ishtp_cl);
ishtp_put_device(cl_device);
return 0;
}
/**
* loader_ishtp_cl_reset() - ISH-TP client driver reset
* @cl_device: ISH-TP client device instance
*
* This function gets called on device reset on ISH-TP bus
*
* Return: 0
*/
static int loader_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
{
struct ishtp_cl_data *client_data;
struct ishtp_cl *loader_ishtp_cl = ishtp_get_drvdata(cl_device);
client_data = ishtp_get_client_data(loader_ishtp_cl);
schedule_work(&client_data->work_ishtp_reset);
return 0;
}
static struct ishtp_cl_driver loader_ishtp_cl_driver = {
.name = "ish-loader",
.guid = &loader_ishtp_guid,
.probe = loader_ishtp_cl_probe,
.remove = loader_ishtp_cl_remove,
.reset = loader_ishtp_cl_reset,
};
static int __init ish_loader_init(void)
{
return ishtp_cl_driver_register(&loader_ishtp_cl_driver, THIS_MODULE);
}
static void __exit ish_loader_exit(void)
{
ishtp_cl_driver_unregister(&loader_ishtp_cl_driver);
}
late_initcall(ish_loader_init);
module_exit(ish_loader_exit);
module_param(dma_buf_size_limit, int, 0644);
MODULE_PARM_DESC(dma_buf_size_limit, "Limit the DMA buf size to this value in bytes");
MODULE_DESCRIPTION("ISH ISH-TP Host firmware Loader Client Driver");
MODULE_AUTHOR("Rushikesh S Kadam <rushikesh.s.kadam@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("ishtp:*");
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