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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021, Linaro Limited. All rights reserved.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/qcom_scm.h>
#define LMH_NODE_DCVS 0x44435653
#define LMH_CLUSTER0_NODE_ID 0x6370302D
#define LMH_CLUSTER1_NODE_ID 0x6370312D
#define LMH_SUB_FN_THERMAL 0x54484D4C
#define LMH_SUB_FN_CRNT 0x43524E54
#define LMH_SUB_FN_REL 0x52454C00
#define LMH_SUB_FN_BCL 0x42434C00
#define LMH_ALGO_MODE_ENABLE 0x454E424C
#define LMH_TH_HI_THRESHOLD 0x48494748
#define LMH_TH_LOW_THRESHOLD 0x4C4F5700
#define LMH_TH_ARM_THRESHOLD 0x41524D00
#define LMH_REG_DCVS_INTR_CLR 0x8
struct lmh_hw_data {
void __iomem *base;
struct irq_domain *domain;
int irq;
};
static irqreturn_t lmh_handle_irq(int hw_irq, void *data)
{
struct lmh_hw_data *lmh_data = data;
int irq = irq_find_mapping(lmh_data->domain, 0);
/* Call the cpufreq driver to handle the interrupt */
if (irq)
generic_handle_irq(irq);
return 0;
}
static void lmh_enable_interrupt(struct irq_data *d)
{
struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);
/* Clear the existing interrupt */
writel(0xff, lmh_data->base + LMH_REG_DCVS_INTR_CLR);
enable_irq(lmh_data->irq);
}
static void lmh_disable_interrupt(struct irq_data *d)
{
struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);
disable_irq_nosync(lmh_data->irq);
}
static struct irq_chip lmh_irq_chip = {
.name = "lmh",
.irq_enable = lmh_enable_interrupt,
.irq_disable = lmh_disable_interrupt
};
static int lmh_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
{
struct lmh_hw_data *lmh_data = d->host_data;
irq_set_chip_and_handler(irq, &lmh_irq_chip, handle_simple_irq);
irq_set_chip_data(irq, lmh_data);
return 0;
}
static const struct irq_domain_ops lmh_irq_ops = {
.map = lmh_irq_map,
.xlate = irq_domain_xlate_onecell,
};
static int lmh_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *cpu_node;
struct lmh_hw_data *lmh_data;
int temp_low, temp_high, temp_arm, cpu_id, ret;
u32 node_id;
lmh_data = devm_kzalloc(dev, sizeof(*lmh_data), GFP_KERNEL);
if (!lmh_data)
return -ENOMEM;
lmh_data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(lmh_data->base))
return PTR_ERR(lmh_data->base);
cpu_node = of_parse_phandle(np, "cpus", 0);
if (!cpu_node)
return -EINVAL;
cpu_id = of_cpu_node_to_id(cpu_node);
of_node_put(cpu_node);
ret = of_property_read_u32(np, "qcom,lmh-temp-high-millicelsius", &temp_high);
if (ret) {
dev_err(dev, "missing qcom,lmh-temp-high-millicelsius property\n");
return ret;
}
ret = of_property_read_u32(np, "qcom,lmh-temp-low-millicelsius", &temp_low);
if (ret) {
dev_err(dev, "missing qcom,lmh-temp-low-millicelsius property\n");
return ret;
}
ret = of_property_read_u32(np, "qcom,lmh-temp-arm-millicelsius", &temp_arm);
if (ret) {
dev_err(dev, "missing qcom,lmh-temp-arm-millicelsius property\n");
return ret;
}
/*
* Only sdm845 has lmh hardware currently enabled from hlos. If this is needed
* for other platforms, revisit this to check if the <cpu-id, node-id> should be part
* of a dt match table.
*/
if (cpu_id == 0) {
node_id = LMH_CLUSTER0_NODE_ID;
} else if (cpu_id == 4) {
node_id = LMH_CLUSTER1_NODE_ID;
} else {
dev_err(dev, "Wrong CPU id associated with LMh node\n");
return -EINVAL;
}
if (!qcom_scm_lmh_dcvsh_available())
return -EINVAL;
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_CRNT, LMH_ALGO_MODE_ENABLE, 1,
LMH_NODE_DCVS, node_id, 0);
if (ret)
dev_err(dev, "Error %d enabling current subfunction\n", ret);
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_REL, LMH_ALGO_MODE_ENABLE, 1,
LMH_NODE_DCVS, node_id, 0);
if (ret)
dev_err(dev, "Error %d enabling reliability subfunction\n", ret);
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_BCL, LMH_ALGO_MODE_ENABLE, 1,
LMH_NODE_DCVS, node_id, 0);
if (ret)
dev_err(dev, "Error %d enabling BCL subfunction\n", ret);
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_ALGO_MODE_ENABLE, 1,
LMH_NODE_DCVS, node_id, 0);
if (ret) {
dev_err(dev, "Error %d enabling thermal subfunction\n", ret);
return ret;
}
ret = qcom_scm_lmh_profile_change(0x1);
if (ret) {
dev_err(dev, "Error %d changing profile\n", ret);
return ret;
}
/* Set default thermal trips */
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_ARM_THRESHOLD, temp_arm,
LMH_NODE_DCVS, node_id, 0);
if (ret) {
dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
return ret;
}
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_HI_THRESHOLD, temp_high,
LMH_NODE_DCVS, node_id, 0);
if (ret) {
dev_err(dev, "Error setting thermal HI threshold%d\n", ret);
return ret;
}
ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_LOW_THRESHOLD, temp_low,
LMH_NODE_DCVS, node_id, 0);
if (ret) {
dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
return ret;
}
lmh_data->irq = platform_get_irq(pdev, 0);
lmh_data->domain = irq_domain_add_linear(np, 1, &lmh_irq_ops, lmh_data);
if (!lmh_data->domain) {
dev_err(dev, "Error adding irq_domain\n");
return -EINVAL;
}
/* Disable the irq and let cpufreq enable it when ready to handle the interrupt */
irq_set_status_flags(lmh_data->irq, IRQ_NOAUTOEN);
ret = devm_request_irq(dev, lmh_data->irq, lmh_handle_irq,
IRQF_ONESHOT | IRQF_NO_SUSPEND,
"lmh-irq", lmh_data);
if (ret) {
dev_err(dev, "Error %d registering irq %x\n", ret, lmh_data->irq);
irq_domain_remove(lmh_data->domain);
return ret;
}
return 0;
}
static const struct of_device_id lmh_table[] = {
{ .compatible = "qcom,sdm845-lmh", },
{}
};
MODULE_DEVICE_TABLE(of, lmh_table);
static struct platform_driver lmh_driver = {
.probe = lmh_probe,
.driver = {
.name = "qcom-lmh",
.of_match_table = lmh_table,
.suppress_bind_attrs = true,
},
};
module_platform_driver(lmh_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("QCOM LMh driver");
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