cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rpckbd.c (3416B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Copyright (c) 2000-2001 Vojtech Pavlik
      4 *  Copyright (c) 2002 Russell King
      5 */
      6
      7/*
      8 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
      9 */
     10
     11/*
     12 */
     13
     14#include <linux/module.h>
     15#include <linux/interrupt.h>
     16#include <linux/serio.h>
     17#include <linux/err.h>
     18#include <linux/platform_device.h>
     19#include <linux/io.h>
     20#include <linux/slab.h>
     21
     22#include <mach/hardware.h>
     23#include <asm/hardware/iomd.h>
     24
     25MODULE_AUTHOR("Vojtech Pavlik, Russell King");
     26MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
     27MODULE_LICENSE("GPL");
     28MODULE_ALIAS("platform:kart");
     29
     30struct rpckbd_data {
     31	int tx_irq;
     32	int rx_irq;
     33};
     34
     35static int rpckbd_write(struct serio *port, unsigned char val)
     36{
     37	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
     38		cpu_relax();
     39
     40	iomd_writeb(val, IOMD_KARTTX);
     41
     42	return 0;
     43}
     44
     45static irqreturn_t rpckbd_rx(int irq, void *dev_id)
     46{
     47	struct serio *port = dev_id;
     48	unsigned int byte;
     49	int handled = IRQ_NONE;
     50
     51	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
     52		byte = iomd_readb(IOMD_KARTRX);
     53
     54		serio_interrupt(port, byte, 0);
     55		handled = IRQ_HANDLED;
     56	}
     57	return handled;
     58}
     59
     60static irqreturn_t rpckbd_tx(int irq, void *dev_id)
     61{
     62	return IRQ_HANDLED;
     63}
     64
     65static int rpckbd_open(struct serio *port)
     66{
     67	struct rpckbd_data *rpckbd = port->port_data;
     68
     69	/* Reset the keyboard state machine. */
     70	iomd_writeb(0, IOMD_KCTRL);
     71	iomd_writeb(8, IOMD_KCTRL);
     72	iomd_readb(IOMD_KARTRX);
     73
     74	if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
     75		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
     76		return -EBUSY;
     77	}
     78
     79	if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
     80		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
     81		free_irq(rpckbd->rx_irq, port);
     82		return -EBUSY;
     83	}
     84
     85	return 0;
     86}
     87
     88static void rpckbd_close(struct serio *port)
     89{
     90	struct rpckbd_data *rpckbd = port->port_data;
     91
     92	free_irq(rpckbd->rx_irq, port);
     93	free_irq(rpckbd->tx_irq, port);
     94}
     95
     96/*
     97 * Allocate and initialize serio structure for subsequent registration
     98 * with serio core.
     99 */
    100static int rpckbd_probe(struct platform_device *dev)
    101{
    102	struct rpckbd_data *rpckbd;
    103	struct serio *serio;
    104	int tx_irq, rx_irq;
    105
    106	rx_irq = platform_get_irq(dev, 0);
    107	if (rx_irq <= 0)
    108		return rx_irq < 0 ? rx_irq : -ENXIO;
    109
    110	tx_irq = platform_get_irq(dev, 1);
    111	if (tx_irq <= 0)
    112		return tx_irq < 0 ? tx_irq : -ENXIO;
    113
    114	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
    115	rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
    116	if (!serio || !rpckbd) {
    117		kfree(rpckbd);
    118		kfree(serio);
    119		return -ENOMEM;
    120	}
    121
    122	rpckbd->rx_irq = rx_irq;
    123	rpckbd->tx_irq = tx_irq;
    124
    125	serio->id.type		= SERIO_8042;
    126	serio->write		= rpckbd_write;
    127	serio->open		= rpckbd_open;
    128	serio->close		= rpckbd_close;
    129	serio->dev.parent	= &dev->dev;
    130	serio->port_data	= rpckbd;
    131	strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
    132	strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
    133
    134	platform_set_drvdata(dev, serio);
    135	serio_register_port(serio);
    136	return 0;
    137}
    138
    139static int rpckbd_remove(struct platform_device *dev)
    140{
    141	struct serio *serio = platform_get_drvdata(dev);
    142	struct rpckbd_data *rpckbd = serio->port_data;
    143
    144	serio_unregister_port(serio);
    145	kfree(rpckbd);
    146
    147	return 0;
    148}
    149
    150static struct platform_driver rpckbd_driver = {
    151	.probe		= rpckbd_probe,
    152	.remove		= rpckbd_remove,
    153	.driver		= {
    154		.name	= "kart",
    155	},
    156};
    157module_platform_driver(rpckbd_driver);