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206 lines
5.2 KiB
206 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* SGI O2 MACE PS2 controller driver for linux |
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* |
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* Copyright (C) 2002 Vivien Chappelier |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/serio.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/ioport.h> |
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#include <linux/delay.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/err.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#include <asm/ip32/mace.h> |
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#include <asm/ip32/ip32_ints.h> |
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MODULE_AUTHOR("Vivien Chappelier <[email protected]"); |
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MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver"); |
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MODULE_LICENSE("GPL"); |
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#define MACE_PS2_TIMEOUT 10000 /* in 50us unit */ |
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#define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */ |
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#define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */ |
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#define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */ |
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#define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */ |
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#define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */ |
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#define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */ |
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#define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */ |
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#define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */ |
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#define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */ |
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#define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */ |
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#define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */ |
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#define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */ |
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#define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */ |
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#define PS2_CONTROL_RESET BIT(5) /* reset */ |
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struct maceps2_data { |
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struct mace_ps2port *port; |
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int irq; |
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}; |
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static struct maceps2_data port_data[2]; |
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static struct serio *maceps2_port[2]; |
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static struct platform_device *maceps2_device; |
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static int maceps2_write(struct serio *dev, unsigned char val) |
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{ |
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struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port; |
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unsigned int timeout = MACE_PS2_TIMEOUT; |
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do { |
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if (port->status & PS2_STATUS_TX_EMPTY) { |
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port->tx = val; |
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return 0; |
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} |
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udelay(50); |
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} while (timeout--); |
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return -1; |
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} |
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static irqreturn_t maceps2_interrupt(int irq, void *dev_id) |
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{ |
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struct serio *dev = dev_id; |
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struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port; |
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unsigned long byte; |
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if (port->status & PS2_STATUS_RX_FULL) { |
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byte = port->rx; |
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serio_interrupt(dev, byte & 0xff, 0); |
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} |
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return IRQ_HANDLED; |
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} |
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static int maceps2_open(struct serio *dev) |
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{ |
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struct maceps2_data *data = (struct maceps2_data *)dev->port_data; |
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if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) { |
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printk(KERN_ERR "Could not allocate PS/2 IRQ\n"); |
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return -EBUSY; |
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} |
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/* Reset port */ |
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data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET; |
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udelay(100); |
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/* Enable interrupts */ |
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data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE | |
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PS2_CONTROL_TX_ENABLE | |
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PS2_CONTROL_RX_INT_ENABLE; |
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return 0; |
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} |
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static void maceps2_close(struct serio *dev) |
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{ |
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struct maceps2_data *data = (struct maceps2_data *)dev->port_data; |
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data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET; |
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udelay(100); |
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free_irq(data->irq, dev); |
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} |
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static struct serio *maceps2_allocate_port(int idx) |
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{ |
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struct serio *serio; |
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serio = kzalloc(sizeof(struct serio), GFP_KERNEL); |
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if (serio) { |
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serio->id.type = SERIO_8042; |
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serio->write = maceps2_write; |
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serio->open = maceps2_open; |
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serio->close = maceps2_close; |
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snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx); |
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snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx); |
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serio->port_data = &port_data[idx]; |
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serio->dev.parent = &maceps2_device->dev; |
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} |
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return serio; |
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} |
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static int maceps2_probe(struct platform_device *dev) |
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{ |
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maceps2_port[0] = maceps2_allocate_port(0); |
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maceps2_port[1] = maceps2_allocate_port(1); |
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if (!maceps2_port[0] || !maceps2_port[1]) { |
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kfree(maceps2_port[0]); |
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kfree(maceps2_port[1]); |
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return -ENOMEM; |
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} |
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serio_register_port(maceps2_port[0]); |
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serio_register_port(maceps2_port[1]); |
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return 0; |
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} |
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static int maceps2_remove(struct platform_device *dev) |
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{ |
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serio_unregister_port(maceps2_port[0]); |
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serio_unregister_port(maceps2_port[1]); |
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return 0; |
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} |
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static struct platform_driver maceps2_driver = { |
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.driver = { |
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.name = "maceps2", |
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}, |
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.probe = maceps2_probe, |
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.remove = maceps2_remove, |
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}; |
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static int __init maceps2_init(void) |
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{ |
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int error; |
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error = platform_driver_register(&maceps2_driver); |
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if (error) |
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return error; |
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maceps2_device = platform_device_alloc("maceps2", -1); |
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if (!maceps2_device) { |
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error = -ENOMEM; |
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goto err_unregister_driver; |
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} |
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port_data[0].port = &mace->perif.ps2.keyb; |
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port_data[0].irq = MACEISA_KEYB_IRQ; |
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port_data[1].port = &mace->perif.ps2.mouse; |
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port_data[1].irq = MACEISA_MOUSE_IRQ; |
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error = platform_device_add(maceps2_device); |
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if (error) |
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goto err_free_device; |
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return 0; |
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err_free_device: |
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platform_device_put(maceps2_device); |
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err_unregister_driver: |
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platform_driver_unregister(&maceps2_driver); |
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return error; |
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} |
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static void __exit maceps2_exit(void) |
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{ |
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platform_device_unregister(maceps2_device); |
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platform_driver_unregister(&maceps2_driver); |
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} |
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module_init(maceps2_init); |
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module_exit(maceps2_exit);
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