1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Xilinx XPS PS/2 device driver
24 /* Register offsets for the xps2 device */
66 	int irq;  member
71 	struct device *dev;
79  * xps2_recv() - attempts to receive a byte from the PS/2 port.
80  * @drvdata:	pointer to ps2 device private data structure
89 	int status = -1;  in xps2_recv()
92 	sr = in_be32(drvdata->base_address + XPS2_STATUS_OFFSET);  in xps2_recv()
94 		*byte = in_be32(drvdata->base_address + XPS2_RX_DATA_OFFSET);  in xps2_recv()
104 static irqreturn_t xps2_interrupt(int irq, void *dev_id)  in xps2_interrupt()  argument
112 	intr_sr = in_be32(drvdata->base_address + XPS2_IPISR_OFFSET);  in xps2_interrupt()
113 	out_be32(drvdata->base_address + XPS2_IPISR_OFFSET, intr_sr);  in xps2_interrupt()
117 		dev_warn(drvdata->dev, "receive overrun error\n");  in xps2_interrupt()
120 		drvdata->flags |= SERIO_PARITY;  in xps2_interrupt()
123 		drvdata->flags |= SERIO_TIMEOUT;  in xps2_interrupt()
130 			dev_err(drvdata->dev,  in xps2_interrupt()
133 			serio_interrupt(drvdata->serio, c, drvdata->flags);  in xps2_interrupt()
134 			drvdata->flags = 0;  in xps2_interrupt()
146  * sxps2_write() - sends a byte out through the PS/2 port.
157 	struct xps2data *drvdata = pserio->port_data;  in sxps2_write()
160 	guard(spinlock_irqsave)(&drvdata->lock);  in sxps2_write()
163 	sr = in_be32(drvdata->base_address + XPS2_STATUS_OFFSET);  in sxps2_write()
165 		return -EAGAIN;  in sxps2_write()
167 	out_be32(drvdata->base_address + XPS2_TX_DATA_OFFSET, c);  in sxps2_write()
172  * sxps2_open() - called when a port is opened by the higher layer.
173  * @pserio:	pointer to the serio structure of the PS/2 device
175  * This function requests irq and enables interrupts for the PS/2 device.
179 	struct xps2data *drvdata = pserio->port_data;  in sxps2_open()
183 	error = request_irq(drvdata->irq, &xps2_interrupt, 0,  in sxps2_open()
186 		dev_err(drvdata->dev,  in sxps2_open()
187 			"Couldn't allocate interrupt %d\n", drvdata->irq);  in sxps2_open()
192 	out_be32(drvdata->base_address + XPS2_GIER_OFFSET, XPS2_GIER_GIE_MASK);  in sxps2_open()
193 	out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, XPS2_IPIXR_RX_ALL);  in sxps2_open()
200  * sxps2_close() - frees the interrupt.
201  * @pserio:	pointer to the serio structure of the PS/2 device
203  * This function frees the irq and disables interrupts for the PS/2 device.
207 	struct xps2data *drvdata = pserio->port_data;  in sxps2_close()
210 	out_be32(drvdata->base_address + XPS2_GIER_OFFSET, 0x00);  in sxps2_close()
211 	out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0x00);  in sxps2_close()
212 	free_irq(drvdata->irq, drvdata);  in sxps2_close()
216  * xps2_of_probe - probe method for the PS/2 device.
217  * @ofdev:	pointer to OF device structure
219  * This function probes the PS/2 device in the device tree.
221  * It returns 0, if the driver is bound to the PS/2 device, or a negative
229 	struct device *dev = &ofdev->dev;  in xps2_of_probe()
231 	unsigned int irq;  in xps2_of_probe()  local
234 	dev_info(dev, "Device Tree Probing \'%pOFn\'\n", dev->of_node);  in xps2_of_probe()
236 	/* Get iospace for the device */  in xps2_of_probe()
237 	error = of_address_to_resource(dev->of_node, 0, &r_mem);  in xps2_of_probe()
243 	/* Get IRQ for the device */  in xps2_of_probe()
244 	irq = irq_of_parse_and_map(dev->of_node, 0);  in xps2_of_probe()
245 	if (!irq) {  in xps2_of_probe()
246 		dev_err(dev, "no IRQ found\n");  in xps2_of_probe()
247 		return -ENODEV;  in xps2_of_probe()
253 		error = -ENOMEM;  in xps2_of_probe()
257 	spin_lock_init(&drvdata->lock);  in xps2_of_probe()
258 	drvdata->irq = irq;  in xps2_of_probe()
259 	drvdata->serio = serio;  in xps2_of_probe()
260 	drvdata->dev = dev;  in xps2_of_probe()
267 		error = -EBUSY;  in xps2_of_probe()
272 	drvdata->base_address = ioremap(phys_addr, remap_size);  in xps2_of_probe()
273 	if (drvdata->base_address == NULL) {  in xps2_of_probe()
276 		error = -EFAULT;  in xps2_of_probe()
281 	out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0);  in xps2_of_probe()
284 	 * Reset the PS2 device and abort any current transaction,  in xps2_of_probe()
287 	out_be32(drvdata->base_address + XPS2_SRST_OFFSET, XPS2_SRST_RESET);  in xps2_of_probe()
289 	dev_info(dev, "Xilinx PS2 at 0x%08llX mapped to 0x%p, irq=%d\n",  in xps2_of_probe()
290 		 (unsigned long long)phys_addr, drvdata->base_address,  in xps2_of_probe()
291 		 drvdata->irq);  in xps2_of_probe()
293 	serio->id.type = SERIO_8042;  in xps2_of_probe()
294 	serio->write = sxps2_write;  in xps2_of_probe()
295 	serio->open = sxps2_open;  in xps2_of_probe()
296 	serio->close = sxps2_close;  in xps2_of_probe()
297 	serio->port_data = drvdata;  in xps2_of_probe()
298 	serio->dev.parent = dev;  in xps2_of_probe()
299 	snprintf(serio->name, sizeof(serio->name),  in xps2_of_probe()
301 	snprintf(serio->phys, sizeof(serio->phys),  in xps2_of_probe()
319  * xps2_of_remove - unbinds the driver from the PS/2 device.
320  * @of_dev:	pointer to OF device structure
322  * This function is called if a device is physically removed from the system or
324  * the device.
331 	serio_unregister_port(drvdata->serio);  in xps2_of_remove()
332 	iounmap(drvdata->base_address);  in xps2_of_remove()
334 	/* Get iospace of the device */  in xps2_of_remove()
335 	if (of_address_to_resource(of_dev->dev.of_node, 0, &r_mem))  in xps2_of_remove()
336 		dev_err(drvdata->dev, "invalid address\n");  in xps2_of_remove()
345 	{ .compatible = "xlnx,xps-ps2-1.00.a", },