15 #include <linux/soc/qcom/qcom-pbs.h>
35 static int qcom_pbs_wait_for_ack(struct pbs_dev *pbs, u8 bit_pos)  in qcom_pbs_wait_for_ack()  argument
40 	ret = regmap_read_poll_timeout(pbs->regmap,  pbs->base + PBS_CLIENT_SCRATCH2,  in qcom_pbs_wait_for_ack()
44 		dev_err(pbs->dev, "Timeout for PBS ACK/NACK for bit %u\n", bit_pos);  in qcom_pbs_wait_for_ack()
49 		ret = regmap_write(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH2, 0);  in qcom_pbs_wait_for_ack()
50 		dev_err(pbs->dev, "NACK from PBS for bit %u\n", bit_pos);  in qcom_pbs_wait_for_ack()
54 	dev_dbg(pbs->dev, "PBS sequence for bit %u executed!\n", bit_pos);  in qcom_pbs_wait_for_ack()
59  * qcom_pbs_trigger_event() - Trigger the PBS RAM sequence
60  * @pbs: Pointer to PBS device
63  * This function is used to trigger the PBS RAM sequence to be
66  * The PBS trigger sequence involves
67  * 1. setting the PBS sequence bit in PBS_CLIENT_SCRATCH1
68  * 2. Initiating the SW PBS trigger
71  * 4. If PBS_CLIENT_SCRATCH2 == 0xFF, the PBS sequence failed to execute
75 int qcom_pbs_trigger_event(struct pbs_dev *pbs, u8 bitmap)  in qcom_pbs_trigger_event()  argument
84 	if (IS_ERR_OR_NULL(pbs))  in qcom_pbs_trigger_event()
87 	mutex_lock(&pbs->lock);  in qcom_pbs_trigger_event()
88 	ret = regmap_read(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH2, &val);  in qcom_pbs_trigger_event()
93 		/* PBS error - clear SCRATCH2 register */  in qcom_pbs_trigger_event()
94 		ret = regmap_write(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH2, 0);  in qcom_pbs_trigger_event()
103 		/* Clear the PBS sequence bit position */  in qcom_pbs_trigger_event()
104 		ret = regmap_update_bits(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH2,  in qcom_pbs_trigger_event()
109 		/* Set the PBS sequence bit position */  in qcom_pbs_trigger_event()
110 		ret = regmap_update_bits(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH1,  in qcom_pbs_trigger_event()
116 		ret = regmap_update_bits(pbs->regmap, pbs->base + PBS_CLIENT_TRIG_CTL,  in qcom_pbs_trigger_event()
121 		ret = qcom_pbs_wait_for_ack(pbs, bit_pos);  in qcom_pbs_trigger_event()
125 		/* Clear the PBS sequence bit position */  in qcom_pbs_trigger_event()
126 		regmap_update_bits(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH1, BIT(bit_pos), 0);  in qcom_pbs_trigger_event()
127 		regmap_update_bits(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH2, BIT(bit_pos), 0);  in qcom_pbs_trigger_event()
132 	ret = regmap_update_bits(pbs->regmap, pbs->base + PBS_CLIENT_SCRATCH1, bitmap, 0);  in qcom_pbs_trigger_event()
135 	mutex_unlock(&pbs->lock);  in qcom_pbs_trigger_event()
142  * get_pbs_client_device() - Get the PBS device used by client
145  * This function is used to get the PBS device that is being
153 	struct pbs_dev *pbs;  in get_pbs_client_device()  local
156 										"qcom,pbs", 0);  in get_pbs_client_device()
158 		dev_err(dev, "Missing qcom,pbs property\n");  in get_pbs_client_device()
164 		dev_err(dev, "Unable to find PBS dev_node\n");  in get_pbs_client_device()
168 	pbs = platform_get_drvdata(pdev);  in get_pbs_client_device()
169 	if (!pbs) {  in get_pbs_client_device()
170 		dev_err(dev, "Cannot get pbs instance from %s\n", dev_name(&pdev->dev));  in get_pbs_client_device()
175 	pbs->link = device_link_add(dev, &pdev->dev, DL_FLAG_AUTOREMOVE_SUPPLIER);  in get_pbs_client_device()
176 	if (!pbs->link) {  in get_pbs_client_device()
182 	return pbs;  in get_pbs_client_device()
188 	struct pbs_dev *pbs;  in qcom_pbs_probe()  local
192 	pbs = devm_kzalloc(&pdev->dev, sizeof(*pbs), GFP_KERNEL);  in qcom_pbs_probe()
193 	if (!pbs)  in qcom_pbs_probe()
196 	pbs->dev = &pdev->dev;  in qcom_pbs_probe()
197 	pbs->regmap = dev_get_regmap(pbs->dev->parent, NULL);  in qcom_pbs_probe()
198 	if (!pbs->regmap) {  in qcom_pbs_probe()
199 		dev_err(pbs->dev, "Couldn't get parent's regmap\n");  in qcom_pbs_probe()
203 	ret = device_property_read_u32(pbs->dev, "reg", &val);  in qcom_pbs_probe()
205 		dev_err(pbs->dev, "Couldn't find reg, ret = %d\n", ret);  in qcom_pbs_probe()
208 	pbs->base = val;  in qcom_pbs_probe()
209 	mutex_init(&pbs->lock);  in qcom_pbs_probe()
211 	platform_set_drvdata(pdev, pbs);  in qcom_pbs_probe()
217 	{ .compatible = "qcom,pbs" },
224 		.name		= "qcom-pbs",
231 MODULE_DESCRIPTION("QCOM PBS DRIVER");