--- /dev/null
+/*
+ * SGI O2 MACE PS2 controller driver for linux
+ *
+ * Copyright (C) 2002 Vivien Chappelier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serio.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/err.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/ip32/mace.h>
+#include <asm/ip32/ip32_ints.h>
+
+MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org");
+MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");
+MODULE_LICENSE("GPL");
+
+#define MACE_PS2_TIMEOUT 10000 /* in 50us unit */
+
+#define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */
+#define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */
+#define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */
+#define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */
+#define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */
+#define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */
+#define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */
+#define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */
+
+#define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */
+#define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */
+#define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */
+#define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */
+#define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */
+#define PS2_CONTROL_RESET BIT(5) /* reset */
+
+struct maceps2_data {
+ struct mace_ps2port *port;
+ int irq;
+};
+
+static struct maceps2_data port_data[2];
+static struct serio *maceps2_port[2];
+static struct platform_device *maceps2_device;
+
+static int maceps2_write(struct serio *dev, unsigned char val)
+{
+ struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
+ unsigned int timeout = MACE_PS2_TIMEOUT;
+
+ do {
+ if (port->status & PS2_STATUS_TX_EMPTY) {
+ port->tx = val;
+ return 0;
+ }
+ udelay(50);
+ } while (timeout--);
+
+ return -1;
+}
+
+static irqreturn_t maceps2_interrupt(int irq, void *dev_id)
+{
+ struct serio *dev = dev_id;
+ struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
+ unsigned long byte;
+
+ if (port->status & PS2_STATUS_RX_FULL) {
+ byte = port->rx;
+ serio_interrupt(dev, byte & 0xff, 0);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int maceps2_open(struct serio *dev)
+{
+ struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
+
+ if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
+ printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
+ return -EBUSY;
+ }
+
+ /* Reset port */
+ data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
+ udelay(100);
+
+ /* Enable interrupts */
+ data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
+ PS2_CONTROL_TX_ENABLE |
+ PS2_CONTROL_RX_INT_ENABLE;
+
+ return 0;
+}
+
+static void maceps2_close(struct serio *dev)
+{
+ struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
+
+ data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
+ udelay(100);
+ free_irq(data->irq, dev);
+}
+
+
+static struct serio *maceps2_allocate_port(int idx)
+{
+ struct serio *serio;
+
+ serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
+ if (serio) {
+ serio->id.type = SERIO_8042;
+ serio->write = maceps2_write;
+ serio->open = maceps2_open;
+ serio->close = maceps2_close;
+ snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);
+ snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);
+ serio->port_data = &port_data[idx];
+ serio->dev.parent = &maceps2_device->dev;
+ }
+
+ return serio;
+}
+
+static int maceps2_probe(struct platform_device *dev)
+{
+ maceps2_port[0] = maceps2_allocate_port(0);
+ maceps2_port[1] = maceps2_allocate_port(1);
+ if (!maceps2_port[0] || !maceps2_port[1]) {
+ kfree(maceps2_port[0]);
+ kfree(maceps2_port[1]);
+ return -ENOMEM;
+ }
+
+ serio_register_port(maceps2_port[0]);
+ serio_register_port(maceps2_port[1]);
+
+ return 0;
+}
+
+static int maceps2_remove(struct platform_device *dev)
+{
+ serio_unregister_port(maceps2_port[0]);
+ serio_unregister_port(maceps2_port[1]);
+
+ return 0;
+}
+
+static struct platform_driver maceps2_driver = {
+ .driver = {
+ .name = "maceps2",
+ },
+ .probe = maceps2_probe,
+ .remove = maceps2_remove,
+};
+
+static int __init maceps2_init(void)
+{
+ int error;
+
+ error = platform_driver_register(&maceps2_driver);
+ if (error)
+ return error;
+
+ maceps2_device = platform_device_alloc("maceps2", -1);
+ if (!maceps2_device) {
+ error = -ENOMEM;
+ goto err_unregister_driver;
+ }
+
+ port_data[0].port = &mace->perif.ps2.keyb;
+ port_data[0].irq = MACEISA_KEYB_IRQ;
+ port_data[1].port = &mace->perif.ps2.mouse;
+ port_data[1].irq = MACEISA_MOUSE_IRQ;
+
+ error = platform_device_add(maceps2_device);
+ if (error)
+ goto err_free_device;
+
+ return 0;
+
+ err_free_device:
+ platform_device_put(maceps2_device);
+ err_unregister_driver:
+ platform_driver_unregister(&maceps2_driver);
+ return error;
+}
+
+static void __exit maceps2_exit(void)
+{
+ platform_device_unregister(maceps2_device);
+ platform_driver_unregister(&maceps2_driver);
+}
+
+module_init(maceps2_init);
+module_exit(maceps2_exit);
Code Review / kvmfornfv.git / blobdiff