Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / serio / ambakmi.c

diff --git a/kernel/drivers/input/serio/ambakmi.c b/kernel/drivers/input/serio/ambakmi.c
new file mode 100644 (file)
index 0000000..8b748d9
--- /dev/null
+++ b/kernel/drivers/input/serio/ambakmi.c
@@ -0,0 +1,213 @@
+/*
+ *  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/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 <linux/amba/bus.h>
+#include <linux/amba/kmi.h>
+#include <linux/clk.h>
+
+#include <asm/io.h>
+#include <asm/irq.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 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);
+               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_prepare_enable(kmi->clk);
+       if (ret)
+               goto out;
+
+       divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
+       writeb(divisor, KMICLKDIV);
+       writeb(KMICR_EN, KMICR);
+
+       ret = request_irq(kmi->irq, amba_kmi_int, IRQF_SHARED, "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_unprepare(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_unprepare(kmi->clk);
+}
+
+static int amba_kmi_probe(struct amba_device *dev,
+       const struct amba_id *id)
+{
+       struct amba_kmi_port *kmi;
+       struct serio *io;
+       int ret;
+
+       ret = amba_request_regions(dev, NULL);
+       if (ret)
+               return ret;
+
+       kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
+       io = kzalloc(sizeof(struct serio), GFP_KERNEL);
+       if (!kmi || !io) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+
+       io->id.type     = SERIO_8042;
+       io->write       = amba_kmi_write;
+       io->open        = amba_kmi_open;
+       io->close       = amba_kmi_close;
+       strlcpy(io->name, dev_name(&dev->dev), sizeof(io->name));
+       strlcpy(io->phys, dev_name(&dev->dev), sizeof(io->phys));
+       io->port_data   = kmi;
+       io->dev.parent  = &dev->dev;
+
+       kmi->io         = io;
+       kmi->base       = ioremap(dev->res.start, resource_size(&dev->res));
+       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);
+
+       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 }
+};
+
+MODULE_DEVICE_TABLE(amba, amba_kmi_idtable);
+
+static struct amba_driver ambakmi_driver = {
+       .drv            = {
+               .name   = "kmi-pl050",
+               .owner  = THIS_MODULE,
+       },
+       .id_table       = amba_kmi_idtable,
+       .probe          = amba_kmi_probe,
+       .remove         = amba_kmi_remove,
+       .resume         = amba_kmi_resume,
+};
+
+module_amba_driver(ambakmi_driver);
+
+MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("AMBA KMI controller driver");
+MODULE_LICENSE("GPL");