1 files changed, 359 insertions, 0 deletions

diff --git a/drivers/input/serio/sa1111ps2.c b/drivers/input/serio/sa1111ps2.c
new file mode 100644
index 000000000000..3f0df3330fb2
--- /dev/null
+++ b/drivers/input/serio/sa1111ps2.c
@@ -0,0 +1,359 @@
+/*
+ *  linux/drivers/input/serio/sa1111ps2.c
+ *
+ *  Copyright (C) 2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+#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/irq.h>
+#include <asm/system.h>
+
+#include <asm/hardware/sa1111.h>
+
+struct ps2if {
+        struct serio            *io;
+        struct sa1111_dev       *dev;
+        void __iomem            *base;
+        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 pt_regs *regs)
+{
+        struct ps2if *ps2if = dev_id;
+        unsigned int scancode, flag, status;
+
+        status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
+        while (status & PS2STAT_RXF) {
+                if (status & PS2STAT_STP)
+                        sa1111_writel(PS2STAT_STP, ps2if->base + SA1111_PS2STAT);
+
+                flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
+                       (status & PS2STAT_RXP ? 0 : SERIO_PARITY);
+
+                scancode = sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff;
+
+                if (hweight8(scancode) & 1)
+                        flag ^= SERIO_PARITY;
+
+                serio_interrupt(ps2if->io, scancode, flag, regs);
+
+                status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * Completion of ps2 write
+ */
+static irqreturn_t ps2_txint(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct ps2if *ps2if = dev_id;
+        unsigned int status;
+
+        spin_lock(&ps2if->lock);
+        status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
+        if (ps2if->head == ps2if->tail) {
+                disable_irq(irq);
+                /* done */
+        } else if (status & PS2STAT_TXE) {
+                sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + SA1111_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 (sa1111_readl(ps2if->base + SA1111_PS2STAT) & PS2STAT_TXE) {
+                sa1111_writel(val, ps2if->base + SA1111_PS2DATA);
+        } else {
+                if (ps2if->head == ps2if->tail)
+                        enable_irq(ps2if->dev->irq[1]);
+                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;
+
+        sa1111_enable_device(ps2if->dev);
+
+        ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
+                          SA1111_DRIVER_NAME(ps2if->dev), ps2if);
+        if (ret) {
+                printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
+                        ps2if->dev->irq[0], ret);
+                return ret;
+        }
+
+        ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
+                          SA1111_DRIVER_NAME(ps2if->dev), ps2if);
+        if (ret) {
+                printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
+                        ps2if->dev->irq[1], ret);
+                free_irq(ps2if->dev->irq[0], ps2if);
+                return ret;
+        }
+
+        ps2if->open = 1;
+
+        enable_irq_wake(ps2if->dev->irq[0]);
+
+        sa1111_writel(PS2CR_ENA, ps2if->base + SA1111_PS2CR);
+        return 0;
+}
+
+static void ps2_close(struct serio *io)
+{
+        struct ps2if *ps2if = io->port_data;
+
+        sa1111_writel(0, ps2if->base + SA1111_PS2CR);
+
+        disable_irq_wake(ps2if->dev->irq[0]);
+
+        ps2if->open = 0;
+
+        free_irq(ps2if->dev->irq[1], ps2if);
+        free_irq(ps2if->dev->irq[0], ps2if);
+
+        sa1111_disable_device(ps2if->dev);
+}
+
+/*
+ * Clear the input buffer.
+ */
+static void __init ps2_clear_input(struct ps2if *ps2if)
+{
+        int maxread = 100;
+
+        while (maxread--) {
+                if ((sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff) == 0xff)
+                        break;
+        }
+}
+
+static inline unsigned int
+ps2_test_one(struct ps2if *ps2if, unsigned int mask)
+{
+        unsigned int val;
+
+        sa1111_writel(PS2CR_ENA | mask, ps2if->base + SA1111_PS2CR);
+
+        udelay(2);
+
+        val = sa1111_readl(ps2if->base + SA1111_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 __init 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;
+        }
+
+        sa1111_writel(0, ps2if->base + SA1111_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 = kmalloc(sizeof(struct ps2if), GFP_KERNEL);
+        serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
+        if (!ps2if || !serio) {
+                ret = -ENOMEM;
+                goto free;
+        }
+
+        memset(ps2if, 0, sizeof(struct ps2if));
+        memset(serio, 0, sizeof(struct serio));
+
+        serio->id.type          = SERIO_8042;
+        serio->write            = ps2_write;
+        serio->open             = ps2_open;
+        serio->close            = ps2_close;
+        strlcpy(serio->name, dev->dev.bus_id, sizeof(serio->name));
+        strlcpy(serio->phys, dev->dev.bus_id, 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);
+
+        /*
+         * 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 */
+        sa1111_writel(0, ps2if->base + SA1111_PS2CLKDIV);
+        sa1111_writel(127, ps2if->base + SA1111_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,
+                           dev->res.end - dev->res.start + 1);
+ free:
+        sa1111_set_drvdata(dev, NULL);
+        kfree(ps2if);
+        kfree(serio);
+        return ret;
+}
+
+/*
+ * Remove one device from this driver.
+ */
+static int ps2_remove(struct sa1111_dev *dev)
+{
+        struct ps2if *ps2if = sa1111_get_drvdata(dev);
+
+        serio_unregister_port(ps2if->io);
+        release_mem_region(dev->res.start,
+                           dev->res.end - dev->res.start + 1);
+        sa1111_set_drvdata(dev, NULL);
+
+        kfree(ps2if);
+
+        return 0;
+}
+
+/*
+ * Our device driver structure
+ */
+static struct sa1111_driver ps2_driver = {
+        .drv = {
+                .name   = "sa1111-ps2",
+        },
+        .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 <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("SA1111 PS2 controller driver");
+MODULE_LICENSE("GPL");