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soc: qcom: wcnss_ctrl: Make wcnss_ctrl parent the other components

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We need the signal from wcnss_ctrl indicating that the firmware is up
and running before we can communicate with the other components of the
chip. So make these other components children of the wcnss_ctrl device,
so they can be probed in order.

The process seems to take between 1/2-5 seconds, so this is done in a
worker, instead of holding up the probe.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Bjorn Andersson 2016-06-06 16:58:20 -07:00 committed by Andy Gross
parent 6b1751a86c
commit 6be2b3d084
2 changed files with 114 additions and 19 deletions
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125
drivers/soc/qcom/wcnss_ctrl.c
View File

@ -1,4 +1,5 @@
/*
* Copyright (c) 2016, Linaro Ltd.
* Copyright (c) 2015, Sony Mobile Communications Inc.
*
* This program is free software; you can redistribute it and/or modify
@ -14,8 +15,16 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/soc/qcom/smd.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/soc/qcom/wcnss_ctrl.h>
#define WCNSS_REQUEST_TIMEOUT (5 * HZ)
#define WCNSS_CBC_TIMEOUT (10 * HZ)
#define WCNSS_ACK_DONE_BOOTING 1
#define WCNSS_ACK_COLD_BOOTING 2
#define NV_FRAGMENT_SIZE 3072
#define NVBIN_FILE "wlan/prima/WCNSS_qcom_wlan_nv.bin"
@ -25,17 +34,19 @@
* @dev: device handle
* @channel: SMD channel handle
* @ack: completion for outstanding requests
* @cbc: completion for cbc complete indication
* @ack_status: status of the outstanding request
* @download_nv_work: worker for uploading nv binary
* @probe_work: worker for uploading nv binary
*/
struct wcnss_ctrl {
struct device *dev;
struct qcom_smd_channel *channel;
struct completion ack;
struct completion cbc;
int ack_status;
struct work_struct download_nv_work;
struct work_struct probe_work;
};
/* message types */
@ -48,6 +59,11 @@ enum {
WCNSS_UPLOAD_CAL_RESP,
WCNSS_DOWNLOAD_CAL_REQ,
WCNSS_DOWNLOAD_CAL_RESP,
WCNSS_VBAT_LEVEL_IND,
WCNSS_BUILD_VERSION_REQ,
WCNSS_BUILD_VERSION_RESP,
WCNSS_PM_CONFIG_REQ,
WCNSS_CBC_COMPLETE_IND,
};
/**
@ -128,7 +144,7 @@ static int wcnss_ctrl_smd_callback(struct qcom_smd_channel *channel,
version->major, version->minor,
version->version, version->revision);
schedule_work(&wcnss->download_nv_work);
complete(&wcnss->ack);
break;
case WCNSS_DOWNLOAD_NV_RESP:
if (count != sizeof(*nvresp)) {
@ -141,6 +157,10 @@ static int wcnss_ctrl_smd_callback(struct qcom_smd_channel *channel,
wcnss->ack_status = nvresp->status;
complete(&wcnss->ack);
break;
case WCNSS_CBC_COMPLETE_IND:
dev_dbg(wcnss->dev, "cold boot complete\n");
complete(&wcnss->cbc);
break;
default:
dev_info(wcnss->dev, "unknown message type %d\n", hdr->type);
break;
@ -156,20 +176,32 @@ static int wcnss_ctrl_smd_callback(struct qcom_smd_channel *channel,
static int wcnss_request_version(struct wcnss_ctrl *wcnss)
{
struct wcnss_msg_hdr msg;
int ret;
msg.type = WCNSS_VERSION_REQ;
msg.len = sizeof(msg);
ret = qcom_smd_send(wcnss->channel, &msg, sizeof(msg));
if (ret < 0)
return ret;
return qcom_smd_send(wcnss->channel, &msg, sizeof(msg));
ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_CBC_TIMEOUT);
if (!ret) {
dev_err(wcnss->dev, "timeout waiting for version response\n");
return -ETIMEDOUT;
}
return 0;
}
/**
* wcnss_download_nv() - send nv binary to WCNSS
* @work: work struct to acquire wcnss context
* @wcnss: wcnss_ctrl state handle
* @expect_cbc: indicator to caller that an cbc event is expected
*
* Returns 0 on success. Negative errno on failure.
*/
static void wcnss_download_nv(struct work_struct *work)
static int wcnss_download_nv(struct wcnss_ctrl *wcnss, bool *expect_cbc)
{
struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, download_nv_work);
struct wcnss_download_nv_req *req;
const struct firmware *fw;
const void *data;
@ -178,10 +210,10 @@ static void wcnss_download_nv(struct work_struct *work)
req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
if (!req)
return;
return -ENOMEM;
ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
if (ret) {
if (ret < 0) {
dev_err(wcnss->dev, "Failed to load nv file %s: %d\n",
NVBIN_FILE, ret);
goto free_req;
@ -207,7 +239,7 @@ static void wcnss_download_nv(struct work_struct *work)
memcpy(req->fragment, data, req->frag_size);
ret = qcom_smd_send(wcnss->channel, req, req->hdr.len);
if (ret) {
if (ret < 0) {
dev_err(wcnss->dev, "failed to send smd packet\n");
goto release_fw;
}
@ -220,16 +252,58 @@ static void wcnss_download_nv(struct work_struct *work)
} while (left > 0);
ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_REQUEST_TIMEOUT);
if (!ret)
if (!ret) {
dev_err(wcnss->dev, "timeout waiting for nv upload ack\n");
else if (wcnss->ack_status != 1)
dev_err(wcnss->dev, "nv upload response failed err: %d\n",
wcnss->ack_status);
ret = -ETIMEDOUT;
} else {
*expect_cbc = wcnss->ack_status == WCNSS_ACK_COLD_BOOTING;
ret = 0;
}
release_fw:
release_firmware(fw);
free_req:
kfree(req);
return ret;
}
/**
* qcom_wcnss_open_channel() - open additional SMD channel to WCNSS
* @wcnss: wcnss handle, retrieved from drvdata
* @name: SMD channel name
* @cb: callback to handle incoming data on the channel
*/
struct qcom_smd_channel *qcom_wcnss_open_channel(void *wcnss, const char *name, qcom_smd_cb_t cb)
{
struct wcnss_ctrl *_wcnss = wcnss;
return qcom_smd_open_channel(_wcnss->channel, name, cb);
}
EXPORT_SYMBOL(qcom_wcnss_open_channel);
static void wcnss_async_probe(struct work_struct *work)
{
struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, probe_work);
bool expect_cbc;
int ret;
ret = wcnss_request_version(wcnss);
if (ret < 0)
return;
ret = wcnss_download_nv(wcnss, &expect_cbc);
if (ret < 0)
return;
/* Wait for pending cold boot completion if indicated by the nv downloader */
if (expect_cbc) {
ret = wait_for_completion_timeout(&wcnss->cbc, WCNSS_REQUEST_TIMEOUT);
if (!ret)
dev_err(wcnss->dev, "expected cold boot completion\n");
}
of_platform_populate(wcnss->dev->of_node, NULL, NULL, wcnss->dev);
}
static int wcnss_ctrl_probe(struct qcom_smd_device *sdev)
@ -244,25 +318,38 @@ static int wcnss_ctrl_probe(struct qcom_smd_device *sdev)
wcnss->channel = sdev->channel;
init_completion(&wcnss->ack);
INIT_WORK(&wcnss->download_nv_work, wcnss_download_nv);
init_completion(&wcnss->cbc);
INIT_WORK(&wcnss->probe_work, wcnss_async_probe);
qcom_smd_set_drvdata(sdev->channel, wcnss);
dev_set_drvdata(&sdev->dev, wcnss);
return wcnss_request_version(wcnss);
schedule_work(&wcnss->probe_work);
return 0;
}
static const struct qcom_smd_id wcnss_ctrl_smd_match[] = {
{ .name = "WCNSS_CTRL" },
static void wcnss_ctrl_remove(struct qcom_smd_device *sdev)
{
struct wcnss_ctrl *wcnss = qcom_smd_get_drvdata(sdev->channel);
cancel_work_sync(&wcnss->probe_work);
of_platform_depopulate(&sdev->dev);
}
static const struct of_device_id wcnss_ctrl_of_match[] = {
{ .compatible = "qcom,wcnss", },
{}
};
static struct qcom_smd_driver wcnss_ctrl_driver = {
.probe = wcnss_ctrl_probe,
.remove = wcnss_ctrl_remove,
.callback = wcnss_ctrl_smd_callback,
.smd_match_table = wcnss_ctrl_smd_match,
.driver = {
.name = "qcom_wcnss_ctrl",
.owner = THIS_MODULE,
.of_match_table = wcnss_ctrl_of_match,
},
};

8
include/linux/soc/qcom/wcnss_ctrl.h Normal file
View File

@ -0,0 +1,8 @@
#ifndef __WCNSS_CTRL_H__
#define __WCNSS_CTRL_H__
#include <linux/soc/qcom/smd.h>
struct qcom_smd_channel *qcom_wcnss_open_channel(void *wcnss, const char *name, qcom_smd_cb_t cb);
#endif