[ARM] Provide bus type and support for logic modules.

The IMPD-1 is a logic module (a stackable module) - rather than
trying to abuse platform devices, create our own bus type to handle
these.

arch/arm/mach-integrator/Makefile

@@ -4,7 +4,7 @@
 
 # Object file lists.
 
-obj-y			:= core.o time.o
+obj-y			:= core.o lm.o time.o
 
 obj-$(CONFIG_LEDS)	+= leds.o
 obj-$(CONFIG_PCI)	+= pci_v3.o pci.o

arch/arm/mach-integrator/core.c

@@ -34,6 +34,8 @@
 #include <asm/hardware/amba.h>
 #include <asm/hardware/amba_kmi.h>
 
+#include <asm/arch/lm.h>
+
 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/map.h>
@@ -46,6 +48,7 @@
  * just for now).
  */
 #define VA_IC_BASE	IO_ADDRESS(INTEGRATOR_IC_BASE) 
+#define VA_SC_BASE	IO_ADDRESS(INTEGRATOR_SC_BASE)
 #define VA_CMIC_BASE	IO_ADDRESS(INTEGRATOR_HDR_BASE) + INTEGRATOR_HDR_IC_OFFSET
 
 /*
@@ -161,6 +164,7 @@ static struct amba_device *amba_devs[] __initdata = {
 
 static int __init register_devices(void)
 {
+	unsigned long sc_dec;
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
@@ -169,6 +173,28 @@ static int __init register_devices(void)
 		amba_device_register(d, &iomem_resource);
 	}
 
+	sc_dec = readl(VA_SC_BASE + INTEGRATOR_SC_DEC_OFFSET);
+	for (i = 0; i < 4; i++) {
+		struct lm_device *lmdev;
+
+		if ((sc_dec & (16 << i)) == 0)
+			continue;
+
+		lmdev = kmalloc(sizeof(struct lm_device), GFP_KERNEL);
+		if (!lmdev)
+			continue;
+
+		memset(lmdev, 0, sizeof(struct lm_device));
+
+		lmdev->resource.start = 0xc0000000 + 0x10000000 * i;
+		lmdev->resource.end = lmdev->resource.start + 0x0fffffff;
+		lmdev->resource.flags = IORESOURCE_MEM;
+		lmdev->irq = IRQ_EXPINT0 + i;
+		lmdev->id = i;
+
+		lm_device_register(lmdev);
+	}
+
 	return 0;
 }
 

arch/arm/mach-integrator/impd1.c

@@ -10,7 +10,7 @@
  *  This file provides the core support for the IM-PD1 module.
  *
  * Module / boot parameters.
- *   id=n   impd1.id=n - set the logic module position in stack to 'n'
+ *   lmid=n   impd1.lmid=n - set the logic module position in stack to 'n'
  */
 #include <linux/module.h>
 #include <linux/moduleparam.h>
@@ -21,17 +21,15 @@
 #include <asm/io.h>
 #include <asm/hardware/icst525.h>
 #include <asm/hardware/amba.h>
+#include <asm/arch/lm.h>
 #include <asm/arch/impd1.h>
 #include <asm/sizes.h>
 
 static int module_id;
 
-module_param_named(lmid, module_id, int, 0);
+module_param_named(lmid, module_id, int, 0444);
 MODULE_PARM_DESC(lmid, "logic module stack position");
 
-#define ROM_OFFSET	0x0fffff00
-#define ROM_SIZE	256
-
 struct impd1_module {
 	void	*base;
 };
@@ -142,17 +140,15 @@ static struct impd1_device impd1_devs[] = {
 	}
 };
 
-static int impd1_probe(struct device *dev)
+static int impd1_probe(struct lm_device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct resource *res = &pdev->resource[0];
 	struct impd1_module *impd1;
 	int i, ret;
 
-	if (pdev->id != module_id)
+	if (dev->id != module_id)
 		return -EINVAL;
 
-	if (!request_mem_region(res->start, SZ_4K, "LM registers"))
+	if (!request_mem_region(dev->resource.start, SZ_4K, "LM registers"))
 		return -EBUSY;
 
 	impd1 = kmalloc(sizeof(struct impd1_module), GFP_KERNEL);
@@ -162,22 +158,22 @@ static int impd1_probe(struct device *dev)
 	}
 	memset(impd1, 0, sizeof(struct impd1_module));
 
-	impd1->base = ioremap(res->start, SZ_4K);
+	impd1->base = ioremap(dev->resource.start, SZ_4K);
 	if (!impd1->base) {
 		ret = -ENOMEM;
 		goto free_impd1;
 	}
 
-	dev_set_drvdata(dev, impd1);
+	lm_set_drvdata(dev, impd1);
 
-	printk("IM-PD1 found at 0x%08lx\n", res->start);
+	printk("IM-PD1 found at 0x%08lx\n", dev->resource.start);
 
 	for (i = 0; i < ARRAY_SIZE(impd1_devs); i++) {
 		struct impd1_device *idev = impd1_devs + i;
 		struct amba_device *d;
 		unsigned long pc_base;
 
-		pc_base = res->start + idev->offset;
+		pc_base = dev->resource.start + idev->offset;
 
 		d = kmalloc(sizeof(struct amba_device), GFP_KERNEL);
 		if (!d)
@@ -186,16 +182,16 @@ static int impd1_probe(struct device *dev)
 		memset(d, 0, sizeof(struct amba_device));
 
 		snprintf(d->dev.bus_id, sizeof(d->dev.bus_id),
-			 "lm%x:%5.5lx", pdev->id, idev->offset >> 12);
+			 "lm%x:%5.5lx", dev->id, idev->offset >> 12);
 
-		d->dev.parent	= &pdev->dev;
-		d->res.start	= res->start + idev->offset;
+		d->dev.parent	= &dev->dev;
+		d->res.start	= dev->resource.start + idev->offset;
 		d->res.end	= d->res.start + SZ_4K - 1;
 		d->res.flags	= IORESOURCE_MEM;
-		d->irq		= pdev->resource[1].start;
+		d->irq		= dev->irq;
 		d->periphid	= idev->id;
 
-		ret = amba_device_register(d, res);
+		ret = amba_device_register(d, &dev->resource);
 		if (ret) {
 			printk("unable to register device %s: %d\n",
 				d->dev.bus_id, ret);
@@ -211,47 +207,44 @@ static int impd1_probe(struct device *dev)
 	if (impd1)
 		kfree(impd1);
  release_lm:
-	release_mem_region(res->start, SZ_4K);
+	release_mem_region(dev->resource.start, SZ_4K);
 	return ret;
 }
 
-static int impd1_remove(struct device *dev)
+static void impd1_remove(struct lm_device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct resource *res = &pdev->resource[0];
-	struct impd1_module *impd1 = dev_get_drvdata(dev);
+	struct impd1_module *impd1 = lm_get_drvdata(dev);
 	struct list_head *l, *n;
 
-	list_for_each_safe(l, n, &dev->children) {
+	list_for_each_safe(l, n, &dev->dev.children) {
 		struct device *d = list_to_dev(l);
 
 		device_unregister(d);
 	}
 
-	dev_set_drvdata(dev, NULL);
+	lm_set_drvdata(dev, NULL);
 
 	iounmap(impd1->base);
 	kfree(impd1);
-	release_mem_region(res->start, SZ_4K);
-
-	return 0;
+	release_mem_region(dev->resource.start, SZ_4K);
 }
 
-static struct device_driver impd1_driver = {
-	.name		= "lm",
-	.bus		= &platform_bus_type,
+static struct lm_driver impd1_driver = {
+	.drv = {
+		.name	= "impd1",
+	},
 	.probe		= impd1_probe,
 	.remove		= impd1_remove,
 };
 
 static int __init impd1_init(void)
 {
-	return driver_register(&impd1_driver);
+	return lm_driver_register(&impd1_driver);
 }
 
 static void __exit impd1_exit(void)
 {
-	driver_unregister(&impd1_driver);
+	lm_driver_unregister(&impd1_driver);
 }
 
 module_init(impd1_init);

arch/arm/mach-integrator/lm.c

+/*
+ *  linux/arch/arm/mach-integrator/lm.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/init.h>
+#include <linux/device.h>
+
+#include <asm/arch/lm.h>
+
+#define to_lm_device(d)	container_of(d, struct lm_device, dev)
+#define to_lm_driver(d)	container_of(d, struct lm_driver, drv)
+
+static int lm_match(struct device *dev, struct device_driver *drv)
+{
+	return 1;
+}
+
+static struct bus_type lm_bustype = {
+	.name		= "logicmodule",
+	.match		= lm_match,
+//	.suspend	= lm_suspend,
+//	.resume		= lm_resume,
+};
+
+static int __init lm_init(void)
+{
+	return bus_register(&lm_bustype);
+}
+
+postcore_initcall(lm_init);
+
+static int lm_bus_probe(struct device *dev)
+{
+	struct lm_device *lmdev = to_lm_device(dev);
+	struct lm_driver *lmdrv = to_lm_driver(dev->driver);
+
+	return lmdrv->probe(lmdev);
+}
+
+static int lm_bus_remove(struct device *dev)
+{
+	struct lm_device *lmdev = to_lm_device(dev);
+	struct lm_driver *lmdrv = to_lm_driver(dev->driver);
+
+	lmdrv->remove(lmdev);
+	return 0;
+}
+
+int lm_driver_register(struct lm_driver *drv)
+{
+	drv->drv.bus = &lm_bustype;
+	drv->drv.probe = lm_bus_probe;
+	drv->drv.remove = lm_bus_remove;
+
+	return driver_register(&drv->drv);
+}
+
+void lm_driver_unregister(struct lm_driver *drv)
+{
+	driver_unregister(&drv->drv);
+}
+
+static void lm_device_release(struct device *dev)
+{
+	struct lm_device *d = to_lm_device(dev);
+
+	kfree(d);
+}
+
+int lm_device_register(struct lm_device *dev)
+{
+	int ret;
+
+	dev->dev.release = lm_device_release;
+	dev->dev.bus = &lm_bustype;
+
+	snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id), "lm%d", dev->id);
+	dev->resource.name = dev->dev.bus_id;
+
+	ret = request_resource(&iomem_resource, &dev->resource);
+	if (ret == 0) {
+		ret = device_register(&dev->dev);
+		if (ret)
+			release_resource(&dev->resource);
+	}
+	return ret;
+}

include/asm-arm/arch-integrator/lm.h

+
+struct lm_device {
+	struct device		dev;
+	struct resource		resource;
+	unsigned int		irq;
+	unsigned int		id;
+};
+
+struct lm_driver {
+	struct device_driver	drv;
+	int			(*probe)(struct lm_device *);
+	void			(*remove)(struct lm_device *);
+	int			(*suspend)(struct lm_device *, u32);
+	int			(*resume)(struct lm_device *);
+};
+
+int lm_driver_register(struct lm_driver *drv);
+void lm_driver_unregister(struct lm_driver *drv);
+
+int lm_device_register(struct lm_device *dev);
+
+#define lm_get_drvdata(lm)	dev_get_drvdata(&(lm)->dev)
+#define lm_set_drvdata(lm,d)	dev_set_drvdata(&(lm)->dev, d)