Merge tag 'perf-tools-for-v5.15-2021-09-11' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-microblaze.git] / drivers / thermal / qcom / lmh.c
1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /*
4  * Copyright (C) 2021, Linaro Limited. All rights reserved.
5  */
6 #include <linux/module.h>
7 #include <linux/interrupt.h>
8 #include <linux/irqdomain.h>
9 #include <linux/err.h>
10 #include <linux/platform_device.h>
11 #include <linux/of_platform.h>
12 #include <linux/slab.h>
13 #include <linux/qcom_scm.h>
14
15 #define LMH_NODE_DCVS                   0x44435653
16 #define LMH_CLUSTER0_NODE_ID            0x6370302D
17 #define LMH_CLUSTER1_NODE_ID            0x6370312D
18
19 #define LMH_SUB_FN_THERMAL              0x54484D4C
20 #define LMH_SUB_FN_CRNT                 0x43524E54
21 #define LMH_SUB_FN_REL                  0x52454C00
22 #define LMH_SUB_FN_BCL                  0x42434C00
23
24 #define LMH_ALGO_MODE_ENABLE            0x454E424C
25 #define LMH_TH_HI_THRESHOLD             0x48494748
26 #define LMH_TH_LOW_THRESHOLD            0x4C4F5700
27 #define LMH_TH_ARM_THRESHOLD            0x41524D00
28
29 #define LMH_REG_DCVS_INTR_CLR           0x8
30
31 struct lmh_hw_data {
32         void __iomem *base;
33         struct irq_domain *domain;
34         int irq;
35 };
36
37 static irqreturn_t lmh_handle_irq(int hw_irq, void *data)
38 {
39         struct lmh_hw_data *lmh_data = data;
40         int irq = irq_find_mapping(lmh_data->domain, 0);
41
42         /* Call the cpufreq driver to handle the interrupt */
43         if (irq)
44                 generic_handle_irq(irq);
45
46         return 0;
47 }
48
49 static void lmh_enable_interrupt(struct irq_data *d)
50 {
51         struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);
52
53         /* Clear the existing interrupt */
54         writel(0xff, lmh_data->base + LMH_REG_DCVS_INTR_CLR);
55         enable_irq(lmh_data->irq);
56 }
57
58 static void lmh_disable_interrupt(struct irq_data *d)
59 {
60         struct lmh_hw_data *lmh_data = irq_data_get_irq_chip_data(d);
61
62         disable_irq_nosync(lmh_data->irq);
63 }
64
65 static struct irq_chip lmh_irq_chip = {
66         .name           = "lmh",
67         .irq_enable     = lmh_enable_interrupt,
68         .irq_disable    = lmh_disable_interrupt
69 };
70
71 static int lmh_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
72 {
73         struct lmh_hw_data *lmh_data = d->host_data;
74
75         irq_set_chip_and_handler(irq, &lmh_irq_chip, handle_simple_irq);
76         irq_set_chip_data(irq, lmh_data);
77
78         return 0;
79 }
80
81 static const struct irq_domain_ops lmh_irq_ops = {
82         .map = lmh_irq_map,
83         .xlate = irq_domain_xlate_onecell,
84 };
85
86 static int lmh_probe(struct platform_device *pdev)
87 {
88         struct device *dev = &pdev->dev;
89         struct device_node *np = dev->of_node;
90         struct device_node *cpu_node;
91         struct lmh_hw_data *lmh_data;
92         int temp_low, temp_high, temp_arm, cpu_id, ret;
93         u32 node_id;
94
95         lmh_data = devm_kzalloc(dev, sizeof(*lmh_data), GFP_KERNEL);
96         if (!lmh_data)
97                 return -ENOMEM;
98
99         lmh_data->base = devm_platform_ioremap_resource(pdev, 0);
100         if (IS_ERR(lmh_data->base))
101                 return PTR_ERR(lmh_data->base);
102
103         cpu_node = of_parse_phandle(np, "cpus", 0);
104         if (!cpu_node)
105                 return -EINVAL;
106         cpu_id = of_cpu_node_to_id(cpu_node);
107         of_node_put(cpu_node);
108
109         ret = of_property_read_u32(np, "qcom,lmh-temp-high-millicelsius", &temp_high);
110         if (ret) {
111                 dev_err(dev, "missing qcom,lmh-temp-high-millicelsius property\n");
112                 return ret;
113         }
114
115         ret = of_property_read_u32(np, "qcom,lmh-temp-low-millicelsius", &temp_low);
116         if (ret) {
117                 dev_err(dev, "missing qcom,lmh-temp-low-millicelsius property\n");
118                 return ret;
119         }
120
121         ret = of_property_read_u32(np, "qcom,lmh-temp-arm-millicelsius", &temp_arm);
122         if (ret) {
123                 dev_err(dev, "missing qcom,lmh-temp-arm-millicelsius property\n");
124                 return ret;
125         }
126
127         /*
128          * Only sdm845 has lmh hardware currently enabled from hlos. If this is needed
129          * for other platforms, revisit this to check if the <cpu-id, node-id> should be part
130          * of a dt match table.
131          */
132         if (cpu_id == 0) {
133                 node_id = LMH_CLUSTER0_NODE_ID;
134         } else if (cpu_id == 4) {
135                 node_id = LMH_CLUSTER1_NODE_ID;
136         } else {
137                 dev_err(dev, "Wrong CPU id associated with LMh node\n");
138                 return -EINVAL;
139         }
140
141         if (!qcom_scm_lmh_dcvsh_available())
142                 return -EINVAL;
143
144         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_CRNT, LMH_ALGO_MODE_ENABLE, 1,
145                                  LMH_NODE_DCVS, node_id, 0);
146         if (ret)
147                 dev_err(dev, "Error %d enabling current subfunction\n", ret);
148
149         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_REL, LMH_ALGO_MODE_ENABLE, 1,
150                                  LMH_NODE_DCVS, node_id, 0);
151         if (ret)
152                 dev_err(dev, "Error %d enabling reliability subfunction\n", ret);
153
154         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_BCL, LMH_ALGO_MODE_ENABLE, 1,
155                                  LMH_NODE_DCVS, node_id, 0);
156         if (ret)
157                 dev_err(dev, "Error %d enabling BCL subfunction\n", ret);
158
159         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_ALGO_MODE_ENABLE, 1,
160                                  LMH_NODE_DCVS, node_id, 0);
161         if (ret) {
162                 dev_err(dev, "Error %d enabling thermal subfunction\n", ret);
163                 return ret;
164         }
165
166         ret = qcom_scm_lmh_profile_change(0x1);
167         if (ret) {
168                 dev_err(dev, "Error %d changing profile\n", ret);
169                 return ret;
170         }
171
172         /* Set default thermal trips */
173         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_ARM_THRESHOLD, temp_arm,
174                                  LMH_NODE_DCVS, node_id, 0);
175         if (ret) {
176                 dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
177                 return ret;
178         }
179
180         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_HI_THRESHOLD, temp_high,
181                                  LMH_NODE_DCVS, node_id, 0);
182         if (ret) {
183                 dev_err(dev, "Error setting thermal HI threshold%d\n", ret);
184                 return ret;
185         }
186
187         ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_TH_LOW_THRESHOLD, temp_low,
188                                  LMH_NODE_DCVS, node_id, 0);
189         if (ret) {
190                 dev_err(dev, "Error setting thermal ARM threshold%d\n", ret);
191                 return ret;
192         }
193
194         lmh_data->irq = platform_get_irq(pdev, 0);
195         lmh_data->domain = irq_domain_add_linear(np, 1, &lmh_irq_ops, lmh_data);
196         if (!lmh_data->domain) {
197                 dev_err(dev, "Error adding irq_domain\n");
198                 return -EINVAL;
199         }
200
201         /* Disable the irq and let cpufreq enable it when ready to handle the interrupt */
202         irq_set_status_flags(lmh_data->irq, IRQ_NOAUTOEN);
203         ret = devm_request_irq(dev, lmh_data->irq, lmh_handle_irq,
204                                IRQF_ONESHOT | IRQF_NO_SUSPEND,
205                                "lmh-irq", lmh_data);
206         if (ret) {
207                 dev_err(dev, "Error %d registering irq %x\n", ret, lmh_data->irq);
208                 irq_domain_remove(lmh_data->domain);
209                 return ret;
210         }
211
212         return 0;
213 }
214
215 static const struct of_device_id lmh_table[] = {
216         { .compatible = "qcom,sdm845-lmh", },
217         {}
218 };
219 MODULE_DEVICE_TABLE(of, lmh_table);
220
221 static struct platform_driver lmh_driver = {
222         .probe = lmh_probe,
223         .driver = {
224                 .name = "qcom-lmh",
225                 .of_match_table = lmh_table,
226                 .suppress_bind_attrs = true,
227         },
228 };
229 module_platform_driver(lmh_driver);
230
231 MODULE_LICENSE("GPL v2");
232 MODULE_DESCRIPTION("QCOM LMh driver");