2 * linux/drivers/input/serio/sa1111ps2.c
4 * Copyright (C) 2002 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/input.h>
13 #include <linux/serio.h>
14 #include <linux/errno.h>
15 #include <linux/interrupt.h>
16 #include <linux/ioport.h>
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/slab.h>
20 #include <linux/spinlock.h>
24 #include <asm/system.h>
26 #include <asm/hardware/sa1111.h>
30 struct sa1111_dev *dev;
40 * Read all bytes waiting in the PS2 port. There should be
41 * at the most one, but we loop for safety. If there was a
42 * framing error, we have to manually clear the status.
44 static irqreturn_t ps2_rxint(int irq, void *dev_id, struct pt_regs *regs)
46 struct ps2if *ps2if = dev_id;
47 unsigned int scancode, flag, status;
49 status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
50 while (status & PS2STAT_RXF) {
51 if (status & PS2STAT_STP)
52 sa1111_writel(PS2STAT_STP, ps2if->base + SA1111_PS2STAT);
54 flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
55 (status & PS2STAT_RXP ? 0 : SERIO_PARITY);
57 scancode = sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff;
59 if (hweight8(scancode) & 1)
62 serio_interrupt(ps2if->io, scancode, flag, regs);
64 status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
71 * Completion of ps2 write
73 static irqreturn_t ps2_txint(int irq, void *dev_id, struct pt_regs *regs)
75 struct ps2if *ps2if = dev_id;
78 spin_lock(&ps2if->lock);
79 status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
80 if (ps2if->head == ps2if->tail) {
83 } else if (status & PS2STAT_TXE) {
84 sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + SA1111_PS2DATA);
85 ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
87 spin_unlock(&ps2if->lock);
93 * Write a byte to the PS2 port. We have to wait for the
94 * port to indicate that the transmitter is empty.
96 static int ps2_write(struct serio *io, unsigned char val)
98 struct ps2if *ps2if = io->port_data;
102 spin_lock_irqsave(&ps2if->lock, flags);
105 * If the TX register is empty, we can go straight out.
107 if (sa1111_readl(ps2if->base + SA1111_PS2STAT) & PS2STAT_TXE) {
108 sa1111_writel(val, ps2if->base + SA1111_PS2DATA);
110 if (ps2if->head == ps2if->tail)
111 enable_irq(ps2if->dev->irq[1]);
112 head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
113 if (head != ps2if->tail) {
114 ps2if->buf[ps2if->head] = val;
119 spin_unlock_irqrestore(&ps2if->lock, flags);
123 static int ps2_open(struct serio *io)
125 struct ps2if *ps2if = io->port_data;
128 sa1111_enable_device(ps2if->dev);
130 ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
131 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
133 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
134 ps2if->dev->irq[0], ret);
138 ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
139 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
141 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
142 ps2if->dev->irq[1], ret);
143 free_irq(ps2if->dev->irq[0], ps2if);
149 enable_irq_wake(ps2if->dev->irq[0]);
151 sa1111_writel(PS2CR_ENA, ps2if->base + SA1111_PS2CR);
155 static void ps2_close(struct serio *io)
157 struct ps2if *ps2if = io->port_data;
159 sa1111_writel(0, ps2if->base + SA1111_PS2CR);
161 disable_irq_wake(ps2if->dev->irq[0]);
165 free_irq(ps2if->dev->irq[1], ps2if);
166 free_irq(ps2if->dev->irq[0], ps2if);
168 sa1111_disable_device(ps2if->dev);
172 * Clear the input buffer.
174 static void __init ps2_clear_input(struct ps2if *ps2if)
179 if ((sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff) == 0xff)
184 static inline unsigned int
185 ps2_test_one(struct ps2if *ps2if, unsigned int mask)
189 sa1111_writel(PS2CR_ENA | mask, ps2if->base + SA1111_PS2CR);
193 val = sa1111_readl(ps2if->base + SA1111_PS2STAT);
194 return val & (PS2STAT_KBC | PS2STAT_KBD);
198 * Test the keyboard interface. We basically check to make sure that
199 * we can drive each line to the keyboard independently of each other.
201 static int __init ps2_test(struct ps2if *ps2if)
206 stat = ps2_test_one(ps2if, PS2CR_FKC);
207 if (stat != PS2STAT_KBD) {
208 printk("PS/2 interface test failed[1]: %02x\n", stat);
212 stat = ps2_test_one(ps2if, 0);
213 if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
214 printk("PS/2 interface test failed[2]: %02x\n", stat);
218 stat = ps2_test_one(ps2if, PS2CR_FKD);
219 if (stat != PS2STAT_KBC) {
220 printk("PS/2 interface test failed[3]: %02x\n", stat);
224 sa1111_writel(0, ps2if->base + SA1111_PS2CR);
230 * Add one device to this driver.
232 static int ps2_probe(struct sa1111_dev *dev)
238 ps2if = kmalloc(sizeof(struct ps2if), GFP_KERNEL);
239 serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
240 if (!ps2if || !serio) {
245 memset(ps2if, 0, sizeof(struct ps2if));
246 memset(serio, 0, sizeof(struct serio));
248 serio->id.type = SERIO_8042;
249 serio->write = ps2_write;
250 serio->open = ps2_open;
251 serio->close = ps2_close;
252 strlcpy(serio->name, dev->dev.bus_id, sizeof(serio->name));
253 strlcpy(serio->phys, dev->dev.bus_id, sizeof(serio->phys));
254 serio->port_data = ps2if;
255 serio->dev.parent = &dev->dev;
258 sa1111_set_drvdata(dev, ps2if);
260 spin_lock_init(&ps2if->lock);
263 * Request the physical region for this PS2 port.
265 if (!request_mem_region(dev->res.start,
266 dev->res.end - dev->res.start + 1,
267 SA1111_DRIVER_NAME(dev))) {
273 * Our parent device has already mapped the region.
275 ps2if->base = dev->mapbase;
277 sa1111_enable_device(ps2if->dev);
279 /* Incoming clock is 8MHz */
280 sa1111_writel(0, ps2if->base + SA1111_PS2CLKDIV);
281 sa1111_writel(127, ps2if->base + SA1111_PS2PRECNT);
284 * Flush any pending input.
286 ps2_clear_input(ps2if);
289 * Test the keyboard interface.
291 ret = ps2_test(ps2if);
296 * Flush any pending input.
298 ps2_clear_input(ps2if);
300 sa1111_disable_device(ps2if->dev);
301 serio_register_port(ps2if->io);
305 sa1111_disable_device(ps2if->dev);
306 release_mem_region(dev->res.start,
307 dev->res.end - dev->res.start + 1);
309 sa1111_set_drvdata(dev, NULL);
316 * Remove one device from this driver.
318 static int ps2_remove(struct sa1111_dev *dev)
320 struct ps2if *ps2if = sa1111_get_drvdata(dev);
322 serio_unregister_port(ps2if->io);
323 release_mem_region(dev->res.start,
324 dev->res.end - dev->res.start + 1);
325 sa1111_set_drvdata(dev, NULL);
333 * Our device driver structure
335 static struct sa1111_driver ps2_driver = {
337 .name = "sa1111-ps2",
339 .devid = SA1111_DEVID_PS2,
341 .remove = ps2_remove,
344 static int __init ps2_init(void)
346 return sa1111_driver_register(&ps2_driver);
349 static void __exit ps2_exit(void)
351 sa1111_driver_unregister(&ps2_driver);
354 module_init(ps2_init);
355 module_exit(ps2_exit);
357 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
358 MODULE_DESCRIPTION("SA1111 PS2 controller driver");
359 MODULE_LICENSE("GPL");