2 * Marvell Armada 370/XP thermal sensor driver
4 * Copyright (C) 2013 Marvell
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/device.h>
17 #include <linux/err.h>
19 #include <linux/kernel.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>
27 /* Thermal Manager Control and Status Register */
28 #define PMU_TDC0_SW_RST_MASK (0x1 << 1)
29 #define PMU_TM_DISABLE_OFFS 0
30 #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
31 #define PMU_TDC0_REF_CAL_CNT_OFFS 11
32 #define PMU_TDC0_REF_CAL_CNT_MASK (0x1ff << PMU_TDC0_REF_CAL_CNT_OFFS)
33 #define PMU_TDC0_OTF_CAL_MASK (0x1 << 30)
34 #define PMU_TDC0_START_CAL_MASK (0x1 << 25)
36 #define A375_UNIT_CONTROL_SHIFT 27
37 #define A375_UNIT_CONTROL_MASK 0x7
38 #define A375_READOUT_INVERT BIT(15)
39 #define A375_HW_RESETn BIT(8)
40 #define A380_HW_RESET BIT(8)
43 #define LEGACY_CONTROL_MEM_LEN 0x4
45 /* Current bindings with the 2 control registers under the same memory area */
46 #define LEGACY_CONTROL1_OFFSET 0x0
47 #define CONTROL0_OFFSET 0x0
48 #define CONTROL1_OFFSET 0x4
50 /* TSEN refers to the temperature sensors within the AP */
51 #define CONTROL0_TSEN_START BIT(0)
52 #define CONTROL0_TSEN_RESET BIT(1)
53 #define CONTROL0_TSEN_ENABLE BIT(2)
55 struct armada_thermal_data;
57 /* Marvell EBU Thermal Sensor Dev Structure */
58 struct armada_thermal_priv {
60 void __iomem *control0;
61 void __iomem *control1;
62 struct armada_thermal_data *data;
65 struct armada_thermal_data {
66 /* Initialize the sensor */
67 void (*init_sensor)(struct platform_device *pdev,
68 struct armada_thermal_priv *);
70 /* Test for a valid sensor value (optional) */
71 bool (*is_valid)(struct armada_thermal_priv *);
73 /* Formula coeficients: temp = (b - m * reg) / div */
80 /* Register shift and mask to access the sensor temperature */
81 unsigned int temp_shift;
82 unsigned int temp_mask;
87 static void armadaxp_init_sensor(struct platform_device *pdev,
88 struct armada_thermal_priv *priv)
92 reg = readl_relaxed(priv->control1);
93 reg |= PMU_TDC0_OTF_CAL_MASK;
94 writel(reg, priv->control1);
96 /* Reference calibration value */
97 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
98 reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
99 writel(reg, priv->control1);
101 /* Reset the sensor */
102 reg = readl_relaxed(priv->control1);
103 writel((reg | PMU_TDC0_SW_RST_MASK), priv->control1);
105 writel(reg, priv->control1);
107 /* Enable the sensor */
108 reg = readl_relaxed(priv->status);
109 reg &= ~PMU_TM_DISABLE_MASK;
110 writel(reg, priv->status);
113 static void armada370_init_sensor(struct platform_device *pdev,
114 struct armada_thermal_priv *priv)
118 reg = readl_relaxed(priv->control1);
119 reg |= PMU_TDC0_OTF_CAL_MASK;
120 writel(reg, priv->control1);
122 /* Reference calibration value */
123 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
124 reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
125 writel(reg, priv->control1);
127 reg &= ~PMU_TDC0_START_CAL_MASK;
128 writel(reg, priv->control1);
133 static void armada375_init_sensor(struct platform_device *pdev,
134 struct armada_thermal_priv *priv)
138 reg = readl(priv->control1);
139 reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT);
140 reg &= ~A375_READOUT_INVERT;
141 reg &= ~A375_HW_RESETn;
143 writel(reg, priv->control1);
146 reg |= A375_HW_RESETn;
147 writel(reg, priv->control1);
151 static void armada380_init_sensor(struct platform_device *pdev,
152 struct armada_thermal_priv *priv)
154 u32 reg = readl_relaxed(priv->control1);
156 /* Reset hardware once */
157 if (!(reg & A380_HW_RESET)) {
158 reg |= A380_HW_RESET;
159 writel(reg, priv->control1);
164 static void armada_ap806_init_sensor(struct platform_device *pdev,
165 struct armada_thermal_priv *priv)
169 reg = readl_relaxed(priv->control0);
170 reg &= ~CONTROL0_TSEN_RESET;
171 reg |= CONTROL0_TSEN_START | CONTROL0_TSEN_ENABLE;
172 writel(reg, priv->control0);
176 static bool armada_is_valid(struct armada_thermal_priv *priv)
178 u32 reg = readl_relaxed(priv->status);
180 return reg & priv->data->is_valid_bit;
183 static int armada_get_temp(struct thermal_zone_device *thermal,
186 struct armada_thermal_priv *priv = thermal->devdata;
191 if (priv->data->is_valid && !priv->data->is_valid(priv)) {
192 dev_err(&thermal->device,
193 "Temperature sensor reading not valid\n");
197 reg = readl_relaxed(priv->status);
198 reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;
199 if (priv->data->signed_sample)
200 /* The most significant bit is the sign bit */
201 sample = sign_extend32(reg, fls(priv->data->temp_mask) - 1);
205 /* Get formula coeficients */
206 b = priv->data->coef_b;
207 m = priv->data->coef_m;
208 div = priv->data->coef_div;
210 if (priv->data->inverted)
211 *temp = div_s64((m * sample) - b, div);
213 *temp = div_s64(b - (m * sample), div);
218 static struct thermal_zone_device_ops ops = {
219 .get_temp = armada_get_temp,
222 static const struct armada_thermal_data armadaxp_data = {
223 .init_sensor = armadaxp_init_sensor,
226 .coef_b = 3153000000ULL,
227 .coef_m = 10000000ULL,
231 static const struct armada_thermal_data armada370_data = {
232 .is_valid = armada_is_valid,
233 .init_sensor = armada370_init_sensor,
234 .is_valid_bit = BIT(9),
237 .coef_b = 3153000000ULL,
238 .coef_m = 10000000ULL,
242 static const struct armada_thermal_data armada375_data = {
243 .is_valid = armada_is_valid,
244 .init_sensor = armada375_init_sensor,
245 .is_valid_bit = BIT(10),
248 .coef_b = 3171900000ULL,
249 .coef_m = 10000000ULL,
251 .needs_control0 = true,
254 static const struct armada_thermal_data armada380_data = {
255 .is_valid = armada_is_valid,
256 .init_sensor = armada380_init_sensor,
257 .is_valid_bit = BIT(10),
260 .coef_b = 1172499100ULL,
261 .coef_m = 2000096ULL,
266 static const struct armada_thermal_data armada_ap806_data = {
267 .is_valid = armada_is_valid,
268 .init_sensor = armada_ap806_init_sensor,
269 .is_valid_bit = BIT(16),
276 .signed_sample = true,
277 .needs_control0 = true,
280 static const struct of_device_id armada_thermal_id_table[] = {
282 .compatible = "marvell,armadaxp-thermal",
283 .data = &armadaxp_data,
286 .compatible = "marvell,armada370-thermal",
287 .data = &armada370_data,
290 .compatible = "marvell,armada375-thermal",
291 .data = &armada375_data,
294 .compatible = "marvell,armada380-thermal",
295 .data = &armada380_data,
298 .compatible = "marvell,armada-ap806-thermal",
299 .data = &armada_ap806_data,
305 MODULE_DEVICE_TABLE(of, armada_thermal_id_table);
307 static int armada_thermal_probe(struct platform_device *pdev)
309 void __iomem *control = NULL;
310 struct thermal_zone_device *thermal;
311 const struct of_device_id *match;
312 struct armada_thermal_priv *priv;
313 struct resource *res;
315 match = of_match_device(armada_thermal_id_table, &pdev->dev);
319 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
323 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
324 priv->status = devm_ioremap_resource(&pdev->dev, res);
325 if (IS_ERR(priv->status))
326 return PTR_ERR(priv->status);
328 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
329 control = devm_ioremap_resource(&pdev->dev, res);
331 return PTR_ERR(control);
333 priv->data = (struct armada_thermal_data *)match->data;
336 * Legacy DT bindings only described "control1" register (also referred
337 * as "control MSB" on old documentation). New bindings cover
338 * "control0/control LSB" and "control1/control MSB" registers within
339 * the same resource, which is then of size 8 instead of 4.
341 if (resource_size(res) == LEGACY_CONTROL_MEM_LEN) {
342 /* ->control0 unavailable in this configuration */
343 if (priv->data->needs_control0) {
344 dev_err(&pdev->dev, "No access to control0 register\n");
348 priv->control1 = control + LEGACY_CONTROL1_OFFSET;
350 priv->control0 = control + CONTROL0_OFFSET;
351 priv->control1 = control + CONTROL1_OFFSET;
354 priv->data->init_sensor(pdev, priv);
356 thermal = thermal_zone_device_register("armada_thermal", 0, 0,
357 priv, &ops, NULL, 0, 0);
358 if (IS_ERR(thermal)) {
360 "Failed to register thermal zone device\n");
361 return PTR_ERR(thermal);
364 platform_set_drvdata(pdev, thermal);
369 static int armada_thermal_exit(struct platform_device *pdev)
371 struct thermal_zone_device *armada_thermal =
372 platform_get_drvdata(pdev);
374 thermal_zone_device_unregister(armada_thermal);
379 static struct platform_driver armada_thermal_driver = {
380 .probe = armada_thermal_probe,
381 .remove = armada_thermal_exit,
383 .name = "armada_thermal",
384 .of_match_table = armada_thermal_id_table,
388 module_platform_driver(armada_thermal_driver);
390 MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
391 MODULE_DESCRIPTION("Armada 370/XP thermal driver");
392 MODULE_LICENSE("GPL v2");