1 // SPDX-License-Identifier: GPL-2.0-only
3  *	Driver for Allwinner A10 PS2 host controller
19 #define DRIVER_NAME		"sun4i-ps2"
22 #define PS2_REG_GCTL		0x00	/* PS2 Module Global Control Reg */
23 #define PS2_REG_DATA		0x04	/* PS2 Module Data Reg		*/
24 #define PS2_REG_LCTL		0x08	/* PS2 Module Line Control Reg */
25 #define PS2_REG_LSTS		0x0C	/* PS2 Module Line Status Reg	*/
26 #define PS2_REG_FCTL		0x10	/* PS2 Module FIFO Control Reg */
27 #define PS2_REG_FSTS		0x14	/* PS2 Module FIFO Status Reg	*/
28 #define PS2_REG_CLKDR		0x18	/* PS2 Module Clock Divider Reg*/
30 /*  PS2 GLOBAL CONTROL REGISTER PS2_GCTL */
37 /* PS2 LINE CONTROL REGISTER */
45 /* PS2 LINE STATUS REGISTER */
56 /* PS2 FIFO CONTROL REGISTER */
66 /* PS2 FIFO STATUS REGISTER */
104 	spin_lock(&drvdata->lock);  in sun4i_ps2_interrupt()
107 	intr_status  = readl(drvdata->reg_base + PS2_REG_LSTS);  in sun4i_ps2_interrupt()
108 	fifo_status  = readl(drvdata->reg_base + PS2_REG_FSTS);  in sun4i_ps2_interrupt()
118 		writel(rval, drvdata->reg_base + PS2_REG_LSTS);  in sun4i_ps2_interrupt()
125 		writel(rval, drvdata->reg_base + PS2_REG_FSTS);  in sun4i_ps2_interrupt()
129 	while (rval--) {  in sun4i_ps2_interrupt()
130 		byte = readl(drvdata->reg_base + PS2_REG_DATA) & 0xff;  in sun4i_ps2_interrupt()
131 		serio_interrupt(drvdata->serio, byte, rxflags);  in sun4i_ps2_interrupt()
134 	writel(intr_status, drvdata->reg_base + PS2_REG_LSTS);  in sun4i_ps2_interrupt()
135 	writel(fifo_status, drvdata->reg_base + PS2_REG_FSTS);  in sun4i_ps2_interrupt()
137 	spin_unlock(&drvdata->lock);  in sun4i_ps2_interrupt()
144 	struct sun4i_ps2data *drvdata = serio->port_data;  in sun4i_ps2_open()
154 	writel(rval, drvdata->reg_base + PS2_REG_LCTL);  in sun4i_ps2_open()
161 	writel(rval, drvdata->reg_base + PS2_REG_FCTL);  in sun4i_ps2_open()
163 	src_clk = clk_get_rate(drvdata->clk);  in sun4i_ps2_open()
165 	clk_scdf = src_clk / PS2_SAMPLE_CLK - 1;  in sun4i_ps2_open()
166 	clk_pcdf = PS2_SAMPLE_CLK / PS2_SCLK - 1;  in sun4i_ps2_open()
168 	writel(rval, drvdata->reg_base + PS2_REG_CLKDR);  in sun4i_ps2_open()
174 	spin_lock_irqsave(&drvdata->lock, flags);  in sun4i_ps2_open()
175 	writel(rval, drvdata->reg_base + PS2_REG_GCTL);  in sun4i_ps2_open()
176 	spin_unlock_irqrestore(&drvdata->lock, flags);  in sun4i_ps2_open()
183 	struct sun4i_ps2data *drvdata = serio->port_data;  in sun4i_ps2_close()
187 	rval = readl(drvdata->reg_base + PS2_REG_GCTL);  in sun4i_ps2_close()
188 	writel(rval & ~(PS2_GCTL_INTEN), drvdata->reg_base + PS2_REG_GCTL);  in sun4i_ps2_close()
190 	synchronize_irq(drvdata->irq);  in sun4i_ps2_close()
196 	struct sun4i_ps2data *drvdata = serio->port_data;  in sun4i_ps2_write()
199 		if (readl(drvdata->reg_base + PS2_REG_FSTS) & PS2_FSTS_TXRDY) {  in sun4i_ps2_write()
200 			writel(val, drvdata->reg_base + PS2_REG_DATA);  in sun4i_ps2_write()
213 	struct device *dev = &pdev->dev;  in sun4i_ps2_probe()
219 		error = -ENOMEM;  in sun4i_ps2_probe()
223 	spin_lock_init(&drvdata->lock);  in sun4i_ps2_probe()
229 		error = -ENXIO;  in sun4i_ps2_probe()
233 	drvdata->reg_base = ioremap(res->start, resource_size(res));  in sun4i_ps2_probe()
234 	if (!drvdata->reg_base) {  in sun4i_ps2_probe()
236 		error = -ENOMEM;  in sun4i_ps2_probe()
240 	drvdata->clk = clk_get(dev, NULL);  in sun4i_ps2_probe()
241 	if (IS_ERR(drvdata->clk)) {  in sun4i_ps2_probe()
242 		error = PTR_ERR(drvdata->clk);  in sun4i_ps2_probe()
247 	error = clk_prepare_enable(drvdata->clk);  in sun4i_ps2_probe()
253 	serio->id.type = SERIO_8042;  in sun4i_ps2_probe()
254 	serio->write = sun4i_ps2_write;  in sun4i_ps2_probe()
255 	serio->open = sun4i_ps2_open;  in sun4i_ps2_probe()
256 	serio->close = sun4i_ps2_close;  in sun4i_ps2_probe()
257 	serio->port_data = drvdata;  in sun4i_ps2_probe()
258 	serio->dev.parent = dev;  in sun4i_ps2_probe()
259 	strscpy(serio->name, dev_name(dev), sizeof(serio->name));  in sun4i_ps2_probe()
260 	strscpy(serio->phys, dev_name(dev), sizeof(serio->phys));  in sun4i_ps2_probe()
263 	writel(0, drvdata->reg_base + PS2_REG_GCTL);  in sun4i_ps2_probe()
266 	drvdata->irq = platform_get_irq(pdev, 0);  in sun4i_ps2_probe()
267 	if (drvdata->irq < 0) {  in sun4i_ps2_probe()
268 		error = drvdata->irq;  in sun4i_ps2_probe()
272 	drvdata->serio = serio;  in sun4i_ps2_probe()
273 	drvdata->dev = dev;  in sun4i_ps2_probe()
275 	error = request_irq(drvdata->irq, sun4i_ps2_interrupt, 0,  in sun4i_ps2_probe()
278 		dev_err(drvdata->dev, "failed to allocate interrupt %d: %d\n",  in sun4i_ps2_probe()
279 			drvdata->irq, error);  in sun4i_ps2_probe()
289 	clk_disable_unprepare(drvdata->clk);  in sun4i_ps2_probe()
291 	clk_put(drvdata->clk);  in sun4i_ps2_probe()
293 	iounmap(drvdata->reg_base);  in sun4i_ps2_probe()
304 	serio_unregister_port(drvdata->serio);  in sun4i_ps2_remove()
306 	free_irq(drvdata->irq, drvdata);  in sun4i_ps2_remove()
308 	clk_disable_unprepare(drvdata->clk);  in sun4i_ps2_remove()
309 	clk_put(drvdata->clk);  in sun4i_ps2_remove()
311 	iounmap(drvdata->reg_base);  in sun4i_ps2_remove()
319 	{ .compatible = "allwinner,sun4i-a10-ps2", },
337 MODULE_DESCRIPTION("Allwinner A10/Sun4i PS/2 driver");