| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2019, The Linux Foundation. All rights reserved. |
| */ |
| |
| #define pr_fmt(fmt) "devfreq-qcom-qoslat: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/errno.h> |
| #include <linux/platform_device.h> |
| #include <linux/devfreq.h> |
| #include <linux/pm_opp.h> |
| #include <linux/of.h> |
| #include <linux/mailbox_client.h> |
| #include <linux/mailbox/qmp.h> |
| |
| struct qoslat_data { |
| struct mbox_client mbox_cl; |
| struct mbox_chan *mbox; |
| struct devfreq *df; |
| struct devfreq_dev_profile profile; |
| unsigned int qos_level; |
| }; |
| |
| #define QOS_LEVEL_OFF 1 |
| #define QOS_LEVEL_ON 2 |
| |
| #define MAX_MSG_LEN 96 |
| static int update_qos_level(struct device *dev, struct qoslat_data *d) |
| { |
| struct qmp_pkt pkt; |
| char mbox_msg[MAX_MSG_LEN + 1] = {0}; |
| char *qos_msg = "off"; |
| int ret; |
| |
| if (d->qos_level == QOS_LEVEL_ON) |
| qos_msg = "on"; |
| |
| snprintf(mbox_msg, MAX_MSG_LEN, "{class: ddr, perfmode: %s}", qos_msg); |
| pkt.size = MAX_MSG_LEN; |
| pkt.data = mbox_msg; |
| |
| ret = mbox_send_message(d->mbox, &pkt); |
| if (ret < 0) { |
| dev_err(dev, "Failed to send mbox message: %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int dev_target(struct device *dev, unsigned long *freq, u32 flags) |
| { |
| struct qoslat_data *d = dev_get_drvdata(dev); |
| struct dev_pm_opp *opp; |
| |
| opp = devfreq_recommended_opp(dev, freq, flags); |
| if (!IS_ERR(opp)) |
| dev_pm_opp_put(opp); |
| else |
| return PTR_ERR(opp); |
| |
| if (*freq == d->qos_level) |
| return 0; |
| |
| d->qos_level = *freq; |
| |
| return update_qos_level(dev, d); |
| } |
| |
| static int dev_get_cur_freq(struct device *dev, unsigned long *freq) |
| { |
| struct qoslat_data *d = dev_get_drvdata(dev); |
| |
| *freq = d->qos_level; |
| |
| return 0; |
| } |
| |
| static int devfreq_qcom_qoslat_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct qoslat_data *d; |
| struct devfreq_dev_profile *p; |
| const char *gov_name; |
| int ret = 0; |
| |
| d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL); |
| if (!d) |
| return -ENOMEM; |
| dev_set_drvdata(dev, d); |
| |
| if (!of_find_property(dev->of_node, "mboxes", NULL)) { |
| dev_err(dev, "Couldn't find AOP mbox\n"); |
| return -EINVAL; |
| } |
| d->mbox_cl.dev = dev; |
| d->mbox_cl.tx_block = true; |
| d->mbox_cl.tx_tout = 1000; |
| d->mbox_cl.knows_txdone = false; |
| d->mbox = mbox_request_channel(&d->mbox_cl, 0); |
| if (IS_ERR(d->mbox)) { |
| ret = PTR_ERR(d->mbox); |
| dev_err(dev, "Failed to get mailbox channel: %d\n", ret); |
| return ret; |
| } |
| d->qos_level = QOS_LEVEL_OFF; |
| |
| p = &d->profile; |
| p->target = dev_target; |
| p->get_cur_freq = dev_get_cur_freq; |
| p->polling_ms = 10; |
| |
| ret = dev_pm_opp_of_add_table(dev); |
| if (ret < 0) |
| dev_err(dev, "Couldn't parse OPP table: %d\n", ret); |
| |
| if (of_property_read_string(dev->of_node, "governor", &gov_name)) |
| gov_name = "powersave"; |
| |
| d->df = devfreq_add_device(dev, p, gov_name, NULL); |
| if (IS_ERR(d->df)) { |
| ret = PTR_ERR(d->df); |
| dev_err(dev, "Failed to add devfreq device: %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct of_device_id devfreq_qoslat_match_table[] = { |
| { .compatible = "qcom,devfreq-qoslat" }, |
| {} |
| }; |
| |
| static struct platform_driver devfreq_qcom_qoslat_driver = { |
| .probe = devfreq_qcom_qoslat_probe, |
| .driver = { |
| .name = "devfreq-qcom-qoslat", |
| .of_match_table = devfreq_qoslat_match_table, |
| }, |
| }; |
| module_platform_driver(devfreq_qcom_qoslat_driver); |
| MODULE_DESCRIPTION("Device driver for setting memory latency qos level"); |
| MODULE_LICENSE("GPL v2"); |