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16#include <linux/device.h>
17#include <linux/err.h>
18#include <linux/io.h>
19#include <linux/kernel.h>
20#include <linux/of.h>
21#include <linux/module.h>
22#include <linux/delay.h>
23#include <linux/platform_device.h>
24#include <linux/of_device.h>
25#include <linux/thermal.h>
26
27#define THERMAL_VALID_OFFSET 9
28#define THERMAL_VALID_MASK 0x1
29#define THERMAL_TEMP_OFFSET 10
30#define THERMAL_TEMP_MASK 0x1ff
31
32
33#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
34#define PMU_TM_DISABLE_OFFS 0
35#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
36#define PMU_TDC0_REF_CAL_CNT_OFFS 11
37#define PMU_TDC0_REF_CAL_CNT_MASK (0x1ff << PMU_TDC0_REF_CAL_CNT_OFFS)
38#define PMU_TDC0_OTF_CAL_MASK (0x1 << 30)
39#define PMU_TDC0_START_CAL_MASK (0x1 << 25)
40
41struct armada_thermal_ops;
42
43
44struct armada_thermal_priv {
45 void __iomem *sensor;
46 void __iomem *control;
47 struct armada_thermal_ops *ops;
48};
49
50struct armada_thermal_ops {
51
52 void (*init_sensor)(struct armada_thermal_priv *);
53
54
55 bool (*is_valid)(struct armada_thermal_priv *);
56};
57
58static void armadaxp_init_sensor(struct armada_thermal_priv *priv)
59{
60 unsigned long reg;
61
62 reg = readl_relaxed(priv->control);
63 reg |= PMU_TDC0_OTF_CAL_MASK;
64 writel(reg, priv->control);
65
66
67 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
68 reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
69 writel(reg, priv->control);
70
71
72 reg = readl_relaxed(priv->control);
73 writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
74
75 writel(reg, priv->control);
76
77
78 reg = readl_relaxed(priv->sensor);
79 reg &= ~PMU_TM_DISABLE_MASK;
80 writel(reg, priv->sensor);
81}
82
83static void armada370_init_sensor(struct armada_thermal_priv *priv)
84{
85 unsigned long reg;
86
87 reg = readl_relaxed(priv->control);
88 reg |= PMU_TDC0_OTF_CAL_MASK;
89 writel(reg, priv->control);
90
91
92 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
93 reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
94 writel(reg, priv->control);
95
96 reg &= ~PMU_TDC0_START_CAL_MASK;
97 writel(reg, priv->control);
98
99 mdelay(10);
100}
101
102static bool armada_is_valid(struct armada_thermal_priv *priv)
103{
104 unsigned long reg = readl_relaxed(priv->sensor);
105
106 return (reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK;
107}
108
109static int armada_get_temp(struct thermal_zone_device *thermal,
110 unsigned long *temp)
111{
112 struct armada_thermal_priv *priv = thermal->devdata;
113 unsigned long reg;
114
115
116 if (priv->ops->is_valid && !priv->ops->is_valid(priv)) {
117 dev_err(&thermal->device,
118 "Temperature sensor reading not valid\n");
119 return -EIO;
120 }
121
122 reg = readl_relaxed(priv->sensor);
123 reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
124 *temp = (3153000000UL - (10000000UL*reg)) / 13825;
125 return 0;
126}
127
128static struct thermal_zone_device_ops ops = {
129 .get_temp = armada_get_temp,
130};
131
132static const struct armada_thermal_ops armadaxp_ops = {
133 .init_sensor = armadaxp_init_sensor,
134};
135
136static const struct armada_thermal_ops armada370_ops = {
137 .is_valid = armada_is_valid,
138 .init_sensor = armada370_init_sensor,
139};
140
141static const struct of_device_id armada_thermal_id_table[] = {
142 {
143 .compatible = "marvell,armadaxp-thermal",
144 .data = &armadaxp_ops,
145 },
146 {
147 .compatible = "marvell,armada370-thermal",
148 .data = &armada370_ops,
149 },
150 {
151
152 },
153};
154MODULE_DEVICE_TABLE(of, armada_thermal_id_table);
155
156static int armada_thermal_probe(struct platform_device *pdev)
157{
158 struct thermal_zone_device *thermal;
159 const struct of_device_id *match;
160 struct armada_thermal_priv *priv;
161 struct resource *res;
162
163 match = of_match_device(armada_thermal_id_table, &pdev->dev);
164 if (!match)
165 return -ENODEV;
166
167 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
168 if (!priv)
169 return -ENOMEM;
170
171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172 priv->sensor = devm_ioremap_resource(&pdev->dev, res);
173 if (IS_ERR(priv->sensor))
174 return PTR_ERR(priv->sensor);
175
176 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
177 priv->control = devm_ioremap_resource(&pdev->dev, res);
178 if (IS_ERR(priv->control))
179 return PTR_ERR(priv->control);
180
181 priv->ops = (struct armada_thermal_ops *)match->data;
182 priv->ops->init_sensor(priv);
183
184 thermal = thermal_zone_device_register("armada_thermal", 0, 0,
185 priv, &ops, NULL, 0, 0);
186 if (IS_ERR(thermal)) {
187 dev_err(&pdev->dev,
188 "Failed to register thermal zone device\n");
189 return PTR_ERR(thermal);
190 }
191
192 platform_set_drvdata(pdev, thermal);
193
194 return 0;
195}
196
197static int armada_thermal_exit(struct platform_device *pdev)
198{
199 struct thermal_zone_device *armada_thermal =
200 platform_get_drvdata(pdev);
201
202 thermal_zone_device_unregister(armada_thermal);
203 platform_set_drvdata(pdev, NULL);
204
205 return 0;
206}
207
208static struct platform_driver armada_thermal_driver = {
209 .probe = armada_thermal_probe,
210 .remove = armada_thermal_exit,
211 .driver = {
212 .name = "armada_thermal",
213 .owner = THIS_MODULE,
214 .of_match_table = of_match_ptr(armada_thermal_id_table),
215 },
216};
217
218module_platform_driver(armada_thermal_driver);
219
220MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
221MODULE_DESCRIPTION("Armada 370/XP thermal driver");
222MODULE_LICENSE("GPL v2");
223
