1 files changed, 231 insertions, 0 deletions

diff --git a/drivers/input/serio/ambakmi.c b/drivers/input/serio/ambakmi.c
new file mode 100644
index 000000000000..9b1ab5e7a98d
--- /dev/null
+++ b/drivers/input/serio/ambakmi.c
@@ -0,0 +1,231 @@
+/*
+ *  linux/drivers/input/serio/ambakmi.c
+ *
+ *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
+ *  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, or
+ * (at your option) any later version.
+ */
+#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/device.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/hardware/amba.h>
+#include <asm/hardware/amba_kmi.h>
+#include <asm/hardware/clock.h>
+
+#define KMI_BASE        (kmi->base)
+
+struct amba_kmi_port {
+        struct serio            *io;
+        struct clk              *clk;
+        void __iomem            *base;
+        unsigned int            irq;
+        unsigned int            divisor;
+        unsigned int            open;
+};
+
+static irqreturn_t amba_kmi_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct amba_kmi_port *kmi = dev_id;
+        unsigned int status = readb(KMIIR);
+        int handled = IRQ_NONE;
+
+        while (status & KMIIR_RXINTR) {
+                serio_interrupt(kmi->io, readb(KMIDATA), 0, regs);
+                status = readb(KMIIR);
+                handled = IRQ_HANDLED;
+        }
+
+        return handled;
+}
+
+static int amba_kmi_write(struct serio *io, unsigned char val)
+{
+        struct amba_kmi_port *kmi = io->port_data;
+        unsigned int timeleft = 10000; /* timeout in 100ms */
+
+        while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && timeleft--)
+                udelay(10);
+
+        if (timeleft)
+                writeb(val, KMIDATA);
+
+        return timeleft ? 0 : SERIO_TIMEOUT;
+}
+
+static int amba_kmi_open(struct serio *io)
+{
+        struct amba_kmi_port *kmi = io->port_data;
+        unsigned int divisor;
+        int ret;
+
+        ret = clk_use(kmi->clk);
+        if (ret)
+                goto out;
+
+        ret = clk_enable(kmi->clk);
+        if (ret)
+                goto clk_unuse;
+
+        divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
+        writeb(divisor, KMICLKDIV);
+        writeb(KMICR_EN, KMICR);
+
+        ret = request_irq(kmi->irq, amba_kmi_int, 0, "kmi-pl050", kmi);
+        if (ret) {
+                printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
+                writeb(0, KMICR);
+                goto clk_disable;
+        }
+
+        writeb(KMICR_EN | KMICR_RXINTREN, KMICR);
+
+        return 0;
+
+ clk_disable:
+        clk_disable(kmi->clk);
+ clk_unuse:
+        clk_unuse(kmi->clk);
+ out:
+        return ret;
+}
+
+static void amba_kmi_close(struct serio *io)
+{
+        struct amba_kmi_port *kmi = io->port_data;
+
+        writeb(0, KMICR);
+
+        free_irq(kmi->irq, kmi);
+        clk_disable(kmi->clk);
+        clk_unuse(kmi->clk);
+}
+
+static int amba_kmi_probe(struct amba_device *dev, void *id)
+{
+        struct amba_kmi_port *kmi;
+        struct serio *io;
+        int ret;
+
+        ret = amba_request_regions(dev, NULL);
+        if (ret)
+                return ret;
+
+        kmi = kmalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
+        io = kmalloc(sizeof(struct serio), GFP_KERNEL);
+        if (!kmi || !io) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        memset(kmi, 0, sizeof(struct amba_kmi_port));
+        memset(io, 0, sizeof(struct serio));
+
+        io->id.type     = SERIO_8042;
+        io->write       = amba_kmi_write;
+        io->open        = amba_kmi_open;
+        io->close       = amba_kmi_close;
+        strlcpy(io->name, dev->dev.bus_id, sizeof(io->name));
+        strlcpy(io->phys, dev->dev.bus_id, sizeof(io->phys));
+        io->port_data   = kmi;
+        io->dev.parent  = &dev->dev;
+
+        kmi->io         = io;
+        kmi->base       = ioremap(dev->res.start, KMI_SIZE);
+        if (!kmi->base) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
+        if (IS_ERR(kmi->clk)) {
+                ret = PTR_ERR(kmi->clk);
+                goto unmap;
+        }
+
+        kmi->irq = dev->irq[0];
+        amba_set_drvdata(dev, kmi);
+
+        serio_register_port(kmi->io);
+        return 0;
+
+ unmap:
+        iounmap(kmi->base);
+ out:
+        kfree(kmi);
+        kfree(io);
+        amba_release_regions(dev);
+        return ret;
+}
+
+static int amba_kmi_remove(struct amba_device *dev)
+{
+        struct amba_kmi_port *kmi = amba_get_drvdata(dev);
+
+        amba_set_drvdata(dev, NULL);
+
+        serio_unregister_port(kmi->io);
+        clk_put(kmi->clk);
+        iounmap(kmi->base);
+        kfree(kmi);
+        amba_release_regions(dev);
+        return 0;
+}
+
+static int amba_kmi_resume(struct amba_device *dev)
+{
+        struct amba_kmi_port *kmi = amba_get_drvdata(dev);
+
+        /* kick the serio layer to rescan this port */
+        serio_reconnect(kmi->io);
+
+        return 0;
+}
+
+static struct amba_id amba_kmi_idtable[] = {
+        {
+                .id     = 0x00041050,
+                .mask   = 0x000fffff,
+        },
+        { 0, 0 }
+};
+
+static struct amba_driver ambakmi_driver = {
+        .drv            = {
+                .name   = "kmi-pl050",
+        },
+        .id_table       = amba_kmi_idtable,
+        .probe          = amba_kmi_probe,
+        .remove         = amba_kmi_remove,
+        .resume         = amba_kmi_resume,
+};
+
+static int __init amba_kmi_init(void)
+{
+        return amba_driver_register(&ambakmi_driver);
+}
+
+static void __exit amba_kmi_exit(void)
+{
+        amba_driver_unregister(&ambakmi_driver);
+}
+
+module_init(amba_kmi_init);
+module_exit(amba_kmi_exit);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("AMBA KMI controller driver");
+MODULE_LICENSE("GPL");