forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
386 lines
8.1 KiB
386 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* linux/drivers/input/serio/sa1111ps2.c |
|
* |
|
* Copyright (C) 2002 Russell King |
|
*/ |
|
#include <linux/module.h> |
|
#include <linux/init.h> |
|
#include <linux/input.h> |
|
#include <linux/serio.h> |
|
#include <linux/errno.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/ioport.h> |
|
#include <linux/delay.h> |
|
#include <linux/device.h> |
|
#include <linux/slab.h> |
|
#include <linux/spinlock.h> |
|
|
|
#include <asm/io.h> |
|
|
|
#include <asm/hardware/sa1111.h> |
|
|
|
#define PS2CR 0x0000 |
|
#define PS2STAT 0x0004 |
|
#define PS2DATA 0x0008 |
|
#define PS2CLKDIV 0x000c |
|
#define PS2PRECNT 0x0010 |
|
|
|
#define PS2CR_ENA 0x08 |
|
#define PS2CR_FKD 0x02 |
|
#define PS2CR_FKC 0x01 |
|
|
|
#define PS2STAT_STP 0x0100 |
|
#define PS2STAT_TXE 0x0080 |
|
#define PS2STAT_TXB 0x0040 |
|
#define PS2STAT_RXF 0x0020 |
|
#define PS2STAT_RXB 0x0010 |
|
#define PS2STAT_ENA 0x0008 |
|
#define PS2STAT_RXP 0x0004 |
|
#define PS2STAT_KBD 0x0002 |
|
#define PS2STAT_KBC 0x0001 |
|
|
|
struct ps2if { |
|
struct serio *io; |
|
struct sa1111_dev *dev; |
|
void __iomem *base; |
|
int rx_irq; |
|
int tx_irq; |
|
unsigned int open; |
|
spinlock_t lock; |
|
unsigned int head; |
|
unsigned int tail; |
|
unsigned char buf[4]; |
|
}; |
|
|
|
/* |
|
* Read all bytes waiting in the PS2 port. There should be |
|
* at the most one, but we loop for safety. If there was a |
|
* framing error, we have to manually clear the status. |
|
*/ |
|
static irqreturn_t ps2_rxint(int irq, void *dev_id) |
|
{ |
|
struct ps2if *ps2if = dev_id; |
|
unsigned int scancode, flag, status; |
|
|
|
status = readl_relaxed(ps2if->base + PS2STAT); |
|
while (status & PS2STAT_RXF) { |
|
if (status & PS2STAT_STP) |
|
writel_relaxed(PS2STAT_STP, ps2if->base + PS2STAT); |
|
|
|
flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) | |
|
(status & PS2STAT_RXP ? 0 : SERIO_PARITY); |
|
|
|
scancode = readl_relaxed(ps2if->base + PS2DATA) & 0xff; |
|
|
|
if (hweight8(scancode) & 1) |
|
flag ^= SERIO_PARITY; |
|
|
|
serio_interrupt(ps2if->io, scancode, flag); |
|
|
|
status = readl_relaxed(ps2if->base + PS2STAT); |
|
} |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* |
|
* Completion of ps2 write |
|
*/ |
|
static irqreturn_t ps2_txint(int irq, void *dev_id) |
|
{ |
|
struct ps2if *ps2if = dev_id; |
|
unsigned int status; |
|
|
|
spin_lock(&ps2if->lock); |
|
status = readl_relaxed(ps2if->base + PS2STAT); |
|
if (ps2if->head == ps2if->tail) { |
|
disable_irq_nosync(irq); |
|
/* done */ |
|
} else if (status & PS2STAT_TXE) { |
|
writel_relaxed(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA); |
|
ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1); |
|
} |
|
spin_unlock(&ps2if->lock); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* |
|
* Write a byte to the PS2 port. We have to wait for the |
|
* port to indicate that the transmitter is empty. |
|
*/ |
|
static int ps2_write(struct serio *io, unsigned char val) |
|
{ |
|
struct ps2if *ps2if = io->port_data; |
|
unsigned long flags; |
|
unsigned int head; |
|
|
|
spin_lock_irqsave(&ps2if->lock, flags); |
|
|
|
/* |
|
* If the TX register is empty, we can go straight out. |
|
*/ |
|
if (readl_relaxed(ps2if->base + PS2STAT) & PS2STAT_TXE) { |
|
writel_relaxed(val, ps2if->base + PS2DATA); |
|
} else { |
|
if (ps2if->head == ps2if->tail) |
|
enable_irq(ps2if->tx_irq); |
|
head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1); |
|
if (head != ps2if->tail) { |
|
ps2if->buf[ps2if->head] = val; |
|
ps2if->head = head; |
|
} |
|
} |
|
|
|
spin_unlock_irqrestore(&ps2if->lock, flags); |
|
return 0; |
|
} |
|
|
|
static int ps2_open(struct serio *io) |
|
{ |
|
struct ps2if *ps2if = io->port_data; |
|
int ret; |
|
|
|
ret = sa1111_enable_device(ps2if->dev); |
|
if (ret) |
|
return ret; |
|
|
|
ret = request_irq(ps2if->rx_irq, ps2_rxint, 0, |
|
SA1111_DRIVER_NAME(ps2if->dev), ps2if); |
|
if (ret) { |
|
printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n", |
|
ps2if->rx_irq, ret); |
|
sa1111_disable_device(ps2if->dev); |
|
return ret; |
|
} |
|
|
|
ret = request_irq(ps2if->tx_irq, ps2_txint, 0, |
|
SA1111_DRIVER_NAME(ps2if->dev), ps2if); |
|
if (ret) { |
|
printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n", |
|
ps2if->tx_irq, ret); |
|
free_irq(ps2if->rx_irq, ps2if); |
|
sa1111_disable_device(ps2if->dev); |
|
return ret; |
|
} |
|
|
|
ps2if->open = 1; |
|
|
|
enable_irq_wake(ps2if->rx_irq); |
|
|
|
writel_relaxed(PS2CR_ENA, ps2if->base + PS2CR); |
|
return 0; |
|
} |
|
|
|
static void ps2_close(struct serio *io) |
|
{ |
|
struct ps2if *ps2if = io->port_data; |
|
|
|
writel_relaxed(0, ps2if->base + PS2CR); |
|
|
|
disable_irq_wake(ps2if->rx_irq); |
|
|
|
ps2if->open = 0; |
|
|
|
free_irq(ps2if->tx_irq, ps2if); |
|
free_irq(ps2if->rx_irq, ps2if); |
|
|
|
sa1111_disable_device(ps2if->dev); |
|
} |
|
|
|
/* |
|
* Clear the input buffer. |
|
*/ |
|
static void ps2_clear_input(struct ps2if *ps2if) |
|
{ |
|
int maxread = 100; |
|
|
|
while (maxread--) { |
|
if ((readl_relaxed(ps2if->base + PS2DATA) & 0xff) == 0xff) |
|
break; |
|
} |
|
} |
|
|
|
static unsigned int ps2_test_one(struct ps2if *ps2if, |
|
unsigned int mask) |
|
{ |
|
unsigned int val; |
|
|
|
writel_relaxed(PS2CR_ENA | mask, ps2if->base + PS2CR); |
|
|
|
udelay(10); |
|
|
|
val = readl_relaxed(ps2if->base + PS2STAT); |
|
return val & (PS2STAT_KBC | PS2STAT_KBD); |
|
} |
|
|
|
/* |
|
* Test the keyboard interface. We basically check to make sure that |
|
* we can drive each line to the keyboard independently of each other. |
|
*/ |
|
static int ps2_test(struct ps2if *ps2if) |
|
{ |
|
unsigned int stat; |
|
int ret = 0; |
|
|
|
stat = ps2_test_one(ps2if, PS2CR_FKC); |
|
if (stat != PS2STAT_KBD) { |
|
printk("PS/2 interface test failed[1]: %02x\n", stat); |
|
ret = -ENODEV; |
|
} |
|
|
|
stat = ps2_test_one(ps2if, 0); |
|
if (stat != (PS2STAT_KBC | PS2STAT_KBD)) { |
|
printk("PS/2 interface test failed[2]: %02x\n", stat); |
|
ret = -ENODEV; |
|
} |
|
|
|
stat = ps2_test_one(ps2if, PS2CR_FKD); |
|
if (stat != PS2STAT_KBC) { |
|
printk("PS/2 interface test failed[3]: %02x\n", stat); |
|
ret = -ENODEV; |
|
} |
|
|
|
writel_relaxed(0, ps2if->base + PS2CR); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Add one device to this driver. |
|
*/ |
|
static int ps2_probe(struct sa1111_dev *dev) |
|
{ |
|
struct ps2if *ps2if; |
|
struct serio *serio; |
|
int ret; |
|
|
|
ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL); |
|
serio = kzalloc(sizeof(struct serio), GFP_KERNEL); |
|
if (!ps2if || !serio) { |
|
ret = -ENOMEM; |
|
goto free; |
|
} |
|
|
|
serio->id.type = SERIO_8042; |
|
serio->write = ps2_write; |
|
serio->open = ps2_open; |
|
serio->close = ps2_close; |
|
strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name)); |
|
strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys)); |
|
serio->port_data = ps2if; |
|
serio->dev.parent = &dev->dev; |
|
ps2if->io = serio; |
|
ps2if->dev = dev; |
|
sa1111_set_drvdata(dev, ps2if); |
|
|
|
spin_lock_init(&ps2if->lock); |
|
|
|
ps2if->rx_irq = sa1111_get_irq(dev, 0); |
|
if (ps2if->rx_irq <= 0) { |
|
ret = ps2if->rx_irq ? : -ENXIO; |
|
goto free; |
|
} |
|
|
|
ps2if->tx_irq = sa1111_get_irq(dev, 1); |
|
if (ps2if->tx_irq <= 0) { |
|
ret = ps2if->tx_irq ? : -ENXIO; |
|
goto free; |
|
} |
|
|
|
/* |
|
* Request the physical region for this PS2 port. |
|
*/ |
|
if (!request_mem_region(dev->res.start, |
|
dev->res.end - dev->res.start + 1, |
|
SA1111_DRIVER_NAME(dev))) { |
|
ret = -EBUSY; |
|
goto free; |
|
} |
|
|
|
/* |
|
* Our parent device has already mapped the region. |
|
*/ |
|
ps2if->base = dev->mapbase; |
|
|
|
sa1111_enable_device(ps2if->dev); |
|
|
|
/* Incoming clock is 8MHz */ |
|
writel_relaxed(0, ps2if->base + PS2CLKDIV); |
|
writel_relaxed(127, ps2if->base + PS2PRECNT); |
|
|
|
/* |
|
* Flush any pending input. |
|
*/ |
|
ps2_clear_input(ps2if); |
|
|
|
/* |
|
* Test the keyboard interface. |
|
*/ |
|
ret = ps2_test(ps2if); |
|
if (ret) |
|
goto out; |
|
|
|
/* |
|
* Flush any pending input. |
|
*/ |
|
ps2_clear_input(ps2if); |
|
|
|
sa1111_disable_device(ps2if->dev); |
|
serio_register_port(ps2if->io); |
|
return 0; |
|
|
|
out: |
|
sa1111_disable_device(ps2if->dev); |
|
release_mem_region(dev->res.start, resource_size(&dev->res)); |
|
free: |
|
sa1111_set_drvdata(dev, NULL); |
|
kfree(ps2if); |
|
kfree(serio); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Remove one device from this driver. |
|
*/ |
|
static void ps2_remove(struct sa1111_dev *dev) |
|
{ |
|
struct ps2if *ps2if = sa1111_get_drvdata(dev); |
|
|
|
serio_unregister_port(ps2if->io); |
|
release_mem_region(dev->res.start, resource_size(&dev->res)); |
|
sa1111_set_drvdata(dev, NULL); |
|
|
|
kfree(ps2if); |
|
} |
|
|
|
/* |
|
* Our device driver structure |
|
*/ |
|
static struct sa1111_driver ps2_driver = { |
|
.drv = { |
|
.name = "sa1111-ps2", |
|
.owner = THIS_MODULE, |
|
}, |
|
.devid = SA1111_DEVID_PS2, |
|
.probe = ps2_probe, |
|
.remove = ps2_remove, |
|
}; |
|
|
|
static int __init ps2_init(void) |
|
{ |
|
return sa1111_driver_register(&ps2_driver); |
|
} |
|
|
|
static void __exit ps2_exit(void) |
|
{ |
|
sa1111_driver_unregister(&ps2_driver); |
|
} |
|
|
|
module_init(ps2_init); |
|
module_exit(ps2_exit); |
|
|
|
MODULE_AUTHOR("Russell King <[email protected]>"); |
|
MODULE_DESCRIPTION("SA1111 PS2 controller driver"); |
|
MODULE_LICENSE("GPL");
|
|
|