1 // SPDX-License-Identifier: GPL-2.0-or-later
8  * Authors: Shyam Sundar S K <Shyam-sundar.S-[email protected]>
14 #include <linux/devm-helpers.h>
19 #include <linux/ioport.h>
25 #include "i2c-piix4.h"
61 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_process_target()
63 	u8 bank, reg, cmd;  in amd_asf_process_target()  local
71 		/* Set bank as full */  in amd_asf_process_target()
76 		/* Read data bank */  in amd_asf_process_target()
78 		bank = (reg & BIT(3)) ? 1 : 0;  in amd_asf_process_target()
80 		/* Set read data bank */  in amd_asf_process_target()
81 		if (bank) {  in amd_asf_process_target()
96 		/* Clear data bank status */  in amd_asf_process_target()
97 		if (bank) {  in amd_asf_process_target()
114 	i2c_slave_event(dev->target, I2C_SLAVE_WRITE_REQUESTED, &val);  in amd_asf_process_target()
117 		i2c_slave_event(dev->target, I2C_SLAVE_WRITE_RECEIVED, &val);  in amd_asf_process_target()
119 	i2c_slave_event(dev->target, I2C_SLAVE_STOP, &val);  in amd_asf_process_target()
136 	reg = ioread32(dev->mmio_cfg.addr);  in amd_asf_update_mmio_target()
138 	iowrite32(reg, dev->mmio_cfg.addr);  in amd_asf_update_mmio_target()
143 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_setup_target()
166 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_access()
173 		return -EINVAL;  in amd_asf_access()
192 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_xfer()
198 	if (msgs->flags & I2C_M_RD) {  in amd_asf_xfer()
199 		dev_err(&adap->dev, "ASF: Read not supported\n");  in amd_asf_xfer()
200 		return -EOPNOTSUPP;  in amd_asf_xfer()
204 	if (msgs->len > ASF_BLOCK_MAX_BYTES - 3) {  in amd_asf_xfer()
205 		dev_warn(&adap->dev, "ASF: max message length exceeded\n");  in amd_asf_xfer()
206 		return -EOPNOTSUPP;  in amd_asf_xfer()
209 	asf_data[0] = dev_msgs->len;  in amd_asf_xfer()
210 	memcpy(asf_data + 1, dev_msgs[0].buf, dev_msgs->len);  in amd_asf_xfer()
212 	ret = piix4_sb800_region_request(&adap->dev, &dev->mmio_cfg);  in amd_asf_xfer()
223 	prev_port = piix4_sb800_port_sel(0, &dev->mmio_cfg);  in amd_asf_xfer()
224 	ret = amd_asf_access(adap, msgs->addr, msgs[0].buf[0], asf_data);  in amd_asf_xfer()
225 	piix4_sb800_port_sel(prev_port, &dev->mmio_cfg);  in amd_asf_xfer()
227 	piix4_sb800_region_release(&adap->dev, &dev->mmio_cfg);  in amd_asf_xfer()
233 	struct amd_asf_dev *dev = i2c_get_adapdata(target->adapter);  in amd_asf_reg_target()
234 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_reg_target()
238 	if (dev->target)  in amd_asf_reg_target()
239 		return -EBUSY;  in amd_asf_reg_target()
241 	ret = piix4_sb800_region_request(&target->dev, &dev->mmio_cfg);  in amd_asf_reg_target()
245 	reg = (target->addr << 1) | I2C_M_RD;  in amd_asf_reg_target()
249 	dev->target = target;  in amd_asf_reg_target()
251 	piix4_sb800_region_release(&target->dev, &dev->mmio_cfg);  in amd_asf_reg_target()
258 	struct amd_asf_dev *dev = i2c_get_adapdata(target->adapter);  in amd_asf_unreg_target()
259 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_unreg_target()
263 	dev->target = NULL;  in amd_asf_unreg_target()
284 	unsigned short piix4_smba = dev->port_addr->start;  in amd_asf_irq_handler()
290 		schedule_delayed_work(&dev->work_buf, HZ);  in amd_asf_irq_handler()
296 	iowrite32(irq, dev->eoi_base);  in amd_asf_irq_handler()
302 	struct device *dev = &pdev->dev;  in amd_asf_probe()
309 		return dev_err_probe(dev, -ENOMEM, "Failed to allocate memory\n");  in amd_asf_probe()
311 	asf_dev->mmio_cfg.use_mmio = true;  in amd_asf_probe()
312 	asf_dev->port_addr = platform_get_resource(pdev, IORESOURCE_IO, 0);  in amd_asf_probe()
313 	if (!asf_dev->port_addr)  in amd_asf_probe()
314 		return dev_err_probe(dev, -EINVAL, "missing IO resources\n");  in amd_asf_probe()
325 		return dev_err_probe(dev, -EINVAL, "missing MEM resources\n");  in amd_asf_probe()
327 	asf_dev->eoi_base = devm_ioremap(dev, eoi_addr->start, resource_size(eoi_addr));  in amd_asf_probe()
328 	if (!asf_dev->eoi_base)  in amd_asf_probe()
329 		return dev_err_probe(dev, -EBUSY, "failed mapping IO region\n");  in amd_asf_probe()
331 	ret = devm_delayed_work_autocancel(dev, &asf_dev->work_buf, amd_asf_process_target);  in amd_asf_probe()
343 	asf_dev->adap.owner = THIS_MODULE;  in amd_asf_probe()
344 	asf_dev->adap.algo = &amd_asf_smbus_algorithm;  in amd_asf_probe()
345 	asf_dev->adap.dev.parent = dev;  in amd_asf_probe()
347 	i2c_set_adapdata(&asf_dev->adap, asf_dev);  in amd_asf_probe()
348 	snprintf(asf_dev->adap.name, sizeof(asf_dev->adap.name), "AMD ASF adapter");  in amd_asf_probe()
350 	return devm_i2c_add_adapter(dev, &asf_dev->adap);  in amd_asf_probe()
361 		.name = "i2c-amd-asf",