1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2009-2013, The Linux Foundation. All rights reserved.
8  *  - Largely rewritten from original to not be an i2c driver.
46 /* SSBI PMIC Arbiter command registers */
76 	return readl(ssbi->base + reg);  in ssbi_readl()
81 	writel(val, ssbi->base + reg);  in ssbi_writel()
87  * case, is when using the arbiter and both other CPUs have just
98 	while (timeout--) {  in ssbi_wait_mask()
105 	return -ETIMEDOUT;  in ssbi_wait_mask()
114 	if (ssbi->controller_type == MSM_SBI_CTRL_SSBI2) {  in ssbi_read_bytes()
130 		len--;  in ssbi_read_bytes()
142 	if (ssbi->controller_type == MSM_SBI_CTRL_SSBI2) {  in ssbi_write_bytes()
158 		len--;  in ssbi_write_bytes()
177 	while (timeout--) {  in ssbi_pa_transfer()
181 			return -EPERM;  in ssbi_pa_transfer()
191 	return -ETIMEDOUT;  in ssbi_pa_transfer()
207 		len--;  in ssbi_pa_read_bytes()
226 		len--;  in ssbi_pa_write_bytes()
239 	spin_lock_irqsave(&ssbi->lock, flags);  in ssbi_read()
240 	ret = ssbi->read(ssbi, addr, buf, len);  in ssbi_read()
241 	spin_unlock_irqrestore(&ssbi->lock, flags);  in ssbi_read()
253 	spin_lock_irqsave(&ssbi->lock, flags);  in ssbi_write()
254 	ret = ssbi->write(ssbi, addr, buf, len);  in ssbi_write()
255 	spin_unlock_irqrestore(&ssbi->lock, flags);  in ssbi_write()
263 	struct device_node *np = pdev->dev.of_node;  in ssbi_probe()
267 	ssbi = devm_kzalloc(&pdev->dev, sizeof(*ssbi), GFP_KERNEL);  in ssbi_probe()
269 		return -ENOMEM;  in ssbi_probe()
271 	ssbi->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);  in ssbi_probe()
272 	if (IS_ERR(ssbi->base))  in ssbi_probe()
273 		return PTR_ERR(ssbi->base);  in ssbi_probe()
277 	type = of_get_property(np, "qcom,controller-type", NULL);  in ssbi_probe()
279 		dev_err(&pdev->dev, "Missing qcom,controller-type property\n");  in ssbi_probe()
280 		return -EINVAL;  in ssbi_probe()
282 	dev_info(&pdev->dev, "SSBI controller type: '%s'\n", type);  in ssbi_probe()
284 		ssbi->controller_type = MSM_SBI_CTRL_SSBI;  in ssbi_probe()
286 		ssbi->controller_type = MSM_SBI_CTRL_SSBI2;  in ssbi_probe()
287 	else if (strcmp(type, "pmic-arbiter") == 0)  in ssbi_probe()
288 		ssbi->controller_type = MSM_SBI_CTRL_PMIC_ARBITER;  in ssbi_probe()
290 		dev_err(&pdev->dev, "Unknown qcom,controller-type\n");  in ssbi_probe()
291 		return -EINVAL;  in ssbi_probe()
294 	if (ssbi->controller_type == MSM_SBI_CTRL_PMIC_ARBITER) {  in ssbi_probe()
295 		ssbi->read = ssbi_pa_read_bytes;  in ssbi_probe()
296 		ssbi->write = ssbi_pa_write_bytes;  in ssbi_probe()
298 		ssbi->read = ssbi_read_bytes;  in ssbi_probe()
299 		ssbi->write = ssbi_write_bytes;  in ssbi_probe()
302 	spin_lock_init(&ssbi->lock);  in ssbi_probe()
304 	return devm_of_platform_populate(&pdev->dev);  in ssbi_probe()
322 MODULE_DESCRIPTION("Qualcomm Single-wire Serial Bus Interface (SSBI) driver");