initial_commit

2 files changed, 789 insertions, 0 deletions

diff --git a/drivers/amba/Makefile b/drivers/amba/Makefile
new file mode 100644
index 00000000..40fe7409
--- /dev/null
+++ b/drivers/amba/Makefile
@@ -0,0 +1,2 @@
+obj-y		+= bus.o
+
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
new file mode 100644
index 00000000..d74926e0
--- /dev/null
+++ b/drivers/amba/bus.c
@@ -0,0 +1,787 @@
+/*
+ *  linux/arch/arm/common/amba.c
+ *
+ *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/amba/bus.h>
+
+#include <asm/irq.h>
+#include <asm/sizes.h>
+
+#define to_amba_driver(d)	container_of(d, struct amba_driver, drv)
+
+static const struct amba_id *
+amba_lookup(const struct amba_id *table, struct amba_device *dev)
+{
+	int ret = 0;
+
+	while (table->mask) {
+		ret = (dev->periphid & table->mask) == table->id;
+		if (ret)
+			break;
+		table++;
+	}
+
+	return ret ? table : NULL;
+}
+
+static int amba_match(struct device *dev, struct device_driver *drv)
+{
+	struct amba_device *pcdev = to_amba_device(dev);
+	struct amba_driver *pcdrv = to_amba_driver(drv);
+
+	return amba_lookup(pcdrv->id_table, pcdev) != NULL;
+}
+
+#ifdef CONFIG_HOTPLUG
+static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct amba_device *pcdev = to_amba_device(dev);
+	int retval = 0;
+
+	retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
+	return retval;
+}
+#else
+#define amba_uevent NULL
+#endif
+
+#define amba_attr_func(name,fmt,arg...)					\
+static ssize_t name##_show(struct device *_dev,				\
+			   struct device_attribute *attr, char *buf)	\
+{									\
+	struct amba_device *dev = to_amba_device(_dev);			\
+	return sprintf(buf, fmt, arg);					\
+}
+
+#define amba_attr(name,fmt,arg...)	\
+amba_attr_func(name,fmt,arg)		\
+static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
+
+amba_attr_func(id, "%08x\n", dev->periphid);
+amba_attr(irq0, "%u\n", dev->irq[0]);
+amba_attr(irq1, "%u\n", dev->irq[1]);
+amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
+	 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
+	 dev->res.flags);
+
+static struct device_attribute amba_dev_attrs[] = {
+	__ATTR_RO(id),
+	__ATTR_RO(resource),
+	__ATTR_NULL,
+};
+
+#ifdef CONFIG_PM_SLEEP
+
+static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
+{
+	struct amba_driver *adrv = to_amba_driver(dev->driver);
+	struct amba_device *adev = to_amba_device(dev);
+	int ret = 0;
+
+	if (dev->driver && adrv->suspend)
+		ret = adrv->suspend(adev, mesg);
+
+	return ret;
+}
+
+static int amba_legacy_resume(struct device *dev)
+{
+	struct amba_driver *adrv = to_amba_driver(dev->driver);
+	struct amba_device *adev = to_amba_device(dev);
+	int ret = 0;
+
+	if (dev->driver && adrv->resume)
+		ret = adrv->resume(adev);
+
+	return ret;
+}
+
+static int amba_pm_prepare(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (drv && drv->pm && drv->pm->prepare)
+		ret = drv->pm->prepare(dev);
+
+	return ret;
+}
+
+static void amba_pm_complete(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+
+	if (drv && drv->pm && drv->pm->complete)
+		drv->pm->complete(dev);
+}
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define amba_pm_prepare		NULL
+#define amba_pm_complete		NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_SUSPEND
+
+static int amba_pm_suspend(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->suspend)
+			ret = drv->pm->suspend(dev);
+	} else {
+		ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
+	}
+
+	return ret;
+}
+
+static int amba_pm_suspend_noirq(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->suspend_noirq)
+			ret = drv->pm->suspend_noirq(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_resume(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->resume)
+			ret = drv->pm->resume(dev);
+	} else {
+		ret = amba_legacy_resume(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_resume_noirq(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->resume_noirq)
+			ret = drv->pm->resume_noirq(dev);
+	}
+
+	return ret;
+}
+
+#else /* !CONFIG_SUSPEND */
+
+#define amba_pm_suspend		NULL
+#define amba_pm_resume		NULL
+#define amba_pm_suspend_noirq	NULL
+#define amba_pm_resume_noirq	NULL
+
+#endif /* !CONFIG_SUSPEND */
+
+#ifdef CONFIG_HIBERNATE_CALLBACKS
+
+static int amba_pm_freeze(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->freeze)
+			ret = drv->pm->freeze(dev);
+	} else {
+		ret = amba_legacy_suspend(dev, PMSG_FREEZE);
+	}
+
+	return ret;
+}
+
+static int amba_pm_freeze_noirq(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->freeze_noirq)
+			ret = drv->pm->freeze_noirq(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_thaw(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->thaw)
+			ret = drv->pm->thaw(dev);
+	} else {
+		ret = amba_legacy_resume(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_thaw_noirq(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->thaw_noirq)
+			ret = drv->pm->thaw_noirq(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_poweroff(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->poweroff)
+			ret = drv->pm->poweroff(dev);
+	} else {
+		ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
+	}
+
+	return ret;
+}
+
+static int amba_pm_poweroff_noirq(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->poweroff_noirq)
+			ret = drv->pm->poweroff_noirq(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_restore(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->restore)
+			ret = drv->pm->restore(dev);
+	} else {
+		ret = amba_legacy_resume(dev);
+	}
+
+	return ret;
+}
+
+static int amba_pm_restore_noirq(struct device *dev)
+{
+	struct device_driver *drv = dev->driver;
+	int ret = 0;
+
+	if (!drv)
+		return 0;
+
+	if (drv->pm) {
+		if (drv->pm->restore_noirq)
+			ret = drv->pm->restore_noirq(dev);
+	}
+
+	return ret;
+}
+
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
+
+#define amba_pm_freeze		NULL
+#define amba_pm_thaw		NULL
+#define amba_pm_poweroff		NULL
+#define amba_pm_restore		NULL
+#define amba_pm_freeze_noirq	NULL
+#define amba_pm_thaw_noirq		NULL
+#define amba_pm_poweroff_noirq	NULL
+#define amba_pm_restore_noirq	NULL
+
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
+
+#ifdef CONFIG_PM
+
+static const struct dev_pm_ops amba_pm = {
+	.prepare	= amba_pm_prepare,
+	.complete	= amba_pm_complete,
+	.suspend	= amba_pm_suspend,
+	.resume		= amba_pm_resume,
+	.freeze		= amba_pm_freeze,
+	.thaw		= amba_pm_thaw,
+	.poweroff	= amba_pm_poweroff,
+	.restore	= amba_pm_restore,
+	.suspend_noirq	= amba_pm_suspend_noirq,
+	.resume_noirq	= amba_pm_resume_noirq,
+	.freeze_noirq	= amba_pm_freeze_noirq,
+	.thaw_noirq	= amba_pm_thaw_noirq,
+	.poweroff_noirq	= amba_pm_poweroff_noirq,
+	.restore_noirq	= amba_pm_restore_noirq,
+	SET_RUNTIME_PM_OPS(
+		pm_generic_runtime_suspend,
+		pm_generic_runtime_resume,
+		pm_generic_runtime_idle
+	)
+};
+
+#define AMBA_PM (&amba_pm)
+
+#else /* !CONFIG_PM */
+
+#define AMBA_PM	NULL
+
+#endif /* !CONFIG_PM */
+
+/*
+ * Primecells are part of the Advanced Microcontroller Bus Architecture,
+ * so we call the bus "amba".
+ */
+struct bus_type amba_bustype = {
+	.name		= "amba",
+	.dev_attrs	= amba_dev_attrs,
+	.match		= amba_match,
+	.uevent		= amba_uevent,
+	.pm		= AMBA_PM,
+};
+
+static int __init amba_init(void)
+{
+	return bus_register(&amba_bustype);
+}
+
+postcore_initcall(amba_init);
+
+static int amba_get_enable_pclk(struct amba_device *pcdev)
+{
+	struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
+	int ret;
+
+	pcdev->pclk = pclk;
+
+	if (IS_ERR(pclk))
+		return PTR_ERR(pclk);
+
+	ret = clk_enable(pclk);
+	if (ret)
+		clk_put(pclk);
+
+	return ret;
+}
+
+static void amba_put_disable_pclk(struct amba_device *pcdev)
+{
+	struct clk *pclk = pcdev->pclk;
+
+	clk_disable(pclk);
+	clk_put(pclk);
+}
+
+static int amba_get_enable_vcore(struct amba_device *pcdev)
+{
+	struct regulator *vcore = regulator_get(&pcdev->dev, "vcore");
+	int ret;
+
+	pcdev->vcore = vcore;
+
+	if (IS_ERR(vcore)) {
+		/* It is OK not to supply a vcore regulator */
+		if (PTR_ERR(vcore) == -ENODEV)
+			return 0;
+		return PTR_ERR(vcore);
+	}
+
+	ret = regulator_enable(vcore);
+	if (ret) {
+		regulator_put(vcore);
+		pcdev->vcore = ERR_PTR(-ENODEV);
+	}
+
+	return ret;
+}
+
+static void amba_put_disable_vcore(struct amba_device *pcdev)
+{
+	struct regulator *vcore = pcdev->vcore;
+
+	if (!IS_ERR(vcore)) {
+		regulator_disable(vcore);
+		regulator_put(vcore);
+	}
+}
+
+/*
+ * These are the device model conversion veneers; they convert the
+ * device model structures to our more specific structures.
+ */
+static int amba_probe(struct device *dev)
+{
+	struct amba_device *pcdev = to_amba_device(dev);
+	struct amba_driver *pcdrv = to_amba_driver(dev->driver);
+	const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
+	int ret;
+
+	do {
+		ret = amba_get_enable_vcore(pcdev);
+		if (ret)
+			break;
+
+		ret = amba_get_enable_pclk(pcdev);
+		if (ret)
+			break;
+
+		ret = pcdrv->probe(pcdev, id);
+		if (ret == 0)
+			break;
+
+		amba_put_disable_pclk(pcdev);
+		amba_put_disable_vcore(pcdev);
+	} while (0);
+
+	return ret;
+}
+
+static int amba_remove(struct device *dev)
+{
+	struct amba_device *pcdev = to_amba_device(dev);
+	struct amba_driver *drv = to_amba_driver(dev->driver);
+	int ret = drv->remove(pcdev);
+
+	amba_put_disable_pclk(pcdev);
+	amba_put_disable_vcore(pcdev);
+
+	return ret;
+}
+
+static void amba_shutdown(struct device *dev)
+{
+	struct amba_driver *drv = to_amba_driver(dev->driver);
+	drv->shutdown(to_amba_device(dev));
+}
+
+/**
+ *	amba_driver_register - register an AMBA device driver
+ *	@drv: amba device driver structure
+ *
+ *	Register an AMBA device driver with the Linux device model
+ *	core.  If devices pre-exist, the drivers probe function will
+ *	be called.
+ */
+int amba_driver_register(struct amba_driver *drv)
+{
+	drv->drv.bus = &amba_bustype;
+
+#define SETFN(fn)	if (drv->fn) drv->drv.fn = amba_##fn
+	SETFN(probe);
+	SETFN(remove);
+	SETFN(shutdown);
+
+	return driver_register(&drv->drv);
+}
+
+/**
+ *	amba_driver_unregister - remove an AMBA device driver
+ *	@drv: AMBA device driver structure to remove
+ *
+ *	Unregister an AMBA device driver from the Linux device
+ *	model.  The device model will call the drivers remove function
+ *	for each device the device driver is currently handling.
+ */
+void amba_driver_unregister(struct amba_driver *drv)
+{
+	driver_unregister(&drv->drv);
+}
+
+
+static void amba_device_release(struct device *dev)
+{
+	struct amba_device *d = to_amba_device(dev);
+
+	if (d->res.parent)
+		release_resource(&d->res);
+	kfree(d);
+}
+
+/**
+ *	amba_device_register - register an AMBA device
+ *	@dev: AMBA device to register
+ *	@parent: parent memory resource
+ *
+ *	Setup the AMBA device, reading the cell ID if present.
+ *	Claim the resource, and register the AMBA device with
+ *	the Linux device manager.
+ */
+int amba_device_register(struct amba_device *dev, struct resource *parent)
+{
+	u32 size;
+	void __iomem *tmp;
+	int i, ret;
+
+	device_initialize(&dev->dev);
+
+	/*
+	 * Copy from device_add
+	 */
+	if (dev->dev.init_name) {
+		dev_set_name(&dev->dev, "%s", dev->dev.init_name);
+		dev->dev.init_name = NULL;
+	}
+
+	dev->dev.release = amba_device_release;
+	dev->dev.bus = &amba_bustype;
+	dev->dev.dma_mask = &dev->dma_mask;
+	dev->res.name = dev_name(&dev->dev);
+
+	if (!dev->dev.coherent_dma_mask && dev->dma_mask)
+		dev_warn(&dev->dev, "coherent dma mask is unset\n");
+
+	ret = request_resource(parent, &dev->res);
+	if (ret)
+		goto err_out;
+
+	/* Hard-coded primecell ID instead of plug-n-play */
+	if (dev->periphid != 0)
+		goto skip_probe;
+
+	/*
+	 * Dynamically calculate the size of the resource
+	 * and use this for iomap
+	 */
+	size = resource_size(&dev->res);
+	tmp = ioremap(dev->res.start, size);
+	if (!tmp) {
+		ret = -ENOMEM;
+		goto err_release;
+	}
+
+	ret = amba_get_enable_pclk(dev);
+	if (ret == 0) {
+		u32 pid, cid;
+
+		/*
+		 * Read pid and cid based on size of resource
+		 * they are located at end of region
+		 */
+		for (pid = 0, i = 0; i < 4; i++)
+			pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
+				(i * 8);
+		for (cid = 0, i = 0; i < 4; i++)
+			cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
+				(i * 8);
+
+		amba_put_disable_pclk(dev);
+
+		if (cid == AMBA_CID)
+			dev->periphid = pid;
+
+		if (!dev->periphid)
+			ret = -ENODEV;
+	}
+
+	iounmap(tmp);
+
+	if (ret)
+		goto err_release;
+
+ skip_probe:
+	ret = device_add(&dev->dev);
+	if (ret)
+		goto err_release;
+
+	if (dev->irq[0] != NO_IRQ)
+		ret = device_create_file(&dev->dev, &dev_attr_irq0);
+	if (ret == 0 && dev->irq[1] != NO_IRQ)
+		ret = device_create_file(&dev->dev, &dev_attr_irq1);
+	if (ret == 0)
+		return ret;
+
+	device_unregister(&dev->dev);
+
+ err_release:
+	release_resource(&dev->res);
+ err_out:
+	return ret;
+}
+
+/**
+ *	amba_device_unregister - unregister an AMBA device
+ *	@dev: AMBA device to remove
+ *
+ *	Remove the specified AMBA device from the Linux device
+ *	manager.  All files associated with this object will be
+ *	destroyed, and device drivers notified that the device has
+ *	been removed.  The AMBA device's resources including
+ *	the amba_device structure will be freed once all
+ *	references to it have been dropped.
+ */
+void amba_device_unregister(struct amba_device *dev)
+{
+	device_unregister(&dev->dev);
+}
+
+
+struct find_data {
+	struct amba_device *dev;
+	struct device *parent;
+	const char *busid;
+	unsigned int id;
+	unsigned int mask;
+};
+
+static int amba_find_match(struct device *dev, void *data)
+{
+	struct find_data *d = data;
+	struct amba_device *pcdev = to_amba_device(dev);
+	int r;
+
+	r = (pcdev->periphid & d->mask) == d->id;
+	if (d->parent)
+		r &= d->parent == dev->parent;
+	if (d->busid)
+		r &= strcmp(dev_name(dev), d->busid) == 0;
+
+	if (r) {
+		get_device(dev);
+		d->dev = pcdev;
+	}
+
+	return r;
+}
+
+/**
+ *	amba_find_device - locate an AMBA device given a bus id
+ *	@busid: bus id for device (or NULL)
+ *	@parent: parent device (or NULL)
+ *	@id: peripheral ID (or 0)
+ *	@mask: peripheral ID mask (or 0)
+ *
+ *	Return the AMBA device corresponding to the supplied parameters.
+ *	If no device matches, returns NULL.
+ *
+ *	NOTE: When a valid device is found, its refcount is
+ *	incremented, and must be decremented before the returned
+ *	reference.
+ */
+struct amba_device *
+amba_find_device(const char *busid, struct device *parent, unsigned int id,
+		 unsigned int mask)
+{
+	struct find_data data;
+
+	data.dev = NULL;
+	data.parent = parent;
+	data.busid = busid;
+	data.id = id;
+	data.mask = mask;
+
+	bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
+
+	return data.dev;
+}
+
+/**
+ *	amba_request_regions - request all mem regions associated with device
+ *	@dev: amba_device structure for device
+ *	@name: name, or NULL to use driver name
+ */
+int amba_request_regions(struct amba_device *dev, const char *name)
+{
+	int ret = 0;
+	u32 size;
+
+	if (!name)
+		name = dev->dev.driver->name;
+
+	size = resource_size(&dev->res);
+
+	if (!request_mem_region(dev->res.start, size, name))
+		ret = -EBUSY;
+
+	return ret;
+}
+
+/**
+ *	amba_release_regions - release mem regions associated with device
+ *	@dev: amba_device structure for device
+ *
+ *	Release regions claimed by a successful call to amba_request_regions.
+ */
+void amba_release_regions(struct amba_device *dev)
+{
+	u32 size;
+
+	size = resource_size(&dev->res);
+	release_mem_region(dev->res.start, size);
+}
+
+EXPORT_SYMBOL(amba_driver_register);
+EXPORT_SYMBOL(amba_driver_unregister);
+EXPORT_SYMBOL(amba_device_register);
+EXPORT_SYMBOL(amba_device_unregister);
+EXPORT_SYMBOL(amba_find_device);
+EXPORT_SYMBOL(amba_request_regions);
+EXPORT_SYMBOL(amba_release_regions);