[PATCH] superhyway: multiple block support and VCR rework

This extends the API somewhat to allow for platform-specific VCR reading and
writing. Some platforms (like SH4-202) implement the VCR in a split VCRL and
VCRH, but end up being in reverse order or have other quirks that need to be
dealt with, so we add a set of superhyway_ops per-bus to accomodate this.

We also have to extend the per-device resources somewhat, as some devices now
conveniently split control and data blocks. So we allow a platform to
register its set of SuperHyway devices via superhyway_add_devices() with the
control block always ordered as the first resource (as this is the one that
userspace cares about).

Signed-off-by: Paul Mundt <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/sh/superhyway/superhyway-sysfs.c

···
 superhyway_ro_attr(top_mb, "0x%02x\n", vcr.top_mb);
 
 /* Misc */
-superhyway_ro_attr(resource, "0x%08lx\n", resource.start);
+superhyway_ro_attr(resource, "0x%08lx\n", resource[0].start);
 
 struct device_attribute superhyway_dev_attrs[] = {
 	__ATTR_RO(perr_flags),

drivers/sh/superhyway/superhyway.c

···
 
 static void superhyway_device_release(struct device *dev)
 {
-	kfree(to_superhyway_device(dev));
+	struct superhyway_device *sdev = to_superhyway_device(dev);
+
+	kfree(sdev->resource);
+	kfree(sdev);
 }
 
 /**
  * superhyway_add_device - Add a SuperHyway module
- * @mod_id: Module ID (taken from MODULE.VCR.MOD_ID).
  * @base: Physical address where module is mapped.
- * @vcr: VCR value.
+ * @sdev: SuperHyway device to add, or NULL to allocate a new one.
+ * @bus: Bus where SuperHyway module resides.
  *
  * This is responsible for adding a new SuperHyway module. This sets up a new
- * struct superhyway_device for the module being added. Each one of @mod_id,
- * @base, and @vcr are registered with the new device for further use
- * elsewhere.
+ * struct superhyway_device for the module being added if @sdev == NULL.
  *
  * Devices are initially added in the order that they are scanned (from the
  * top-down of the memory map), and are assigned an ID based on the order that
···
  * Further work can and should be done in superhyway_scan_bus(), to be sure
  * that any new modules are properly discovered and subsequently registered.
  */
-int superhyway_add_device(unsigned int mod_id, unsigned long base,
-			  unsigned long long vcr)
+int superhyway_add_device(unsigned long base, struct superhyway_device *sdev,
+			  struct superhyway_bus *bus)
 {
-	struct superhyway_device *dev;
+	struct superhyway_device *dev = sdev;
 
-	dev = kmalloc(sizeof(struct superhyway_device), GFP_KERNEL);
-	if (!dev)
-		return -ENOMEM;
+	if (!dev) {
+		dev = kmalloc(sizeof(struct superhyway_device), GFP_KERNEL);
+		if (!dev)
+			return -ENOMEM;
 
-	memset(dev, 0, sizeof(struct superhyway_device));
+		memset(dev, 0, sizeof(struct superhyway_device));
+	}
 
-	dev->id.id = mod_id;
-	sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
+	dev->bus = bus;
+	superhyway_read_vcr(dev, base, &dev->vcr);
 
-	dev->vcr		= *((struct vcr_info *)(&vcr));
-	dev->resource.name	= dev->name;
-	dev->resource.start	= base;
-	dev->resource.end	= dev->resource.start + 0x01000000;
+	if (!dev->resource) {
+		dev->resource = kmalloc(sizeof(struct resource), GFP_KERNEL);
+		if (!dev->resource) {
+			kfree(dev);
+			return -ENOMEM;
+		}
+
+		dev->resource->name	= dev->name;
+		dev->resource->start	= base;
+		dev->resource->end	= dev->resource->start + 0x01000000;
+	}
+
 	dev->dev.parent		= &superhyway_bus_device;
 	dev->dev.bus		= &superhyway_bus_type;
 	dev->dev.release	= superhyway_device_release;
+	dev->id.id		= dev->vcr.mod_id;
 
+	sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
 	sprintf(dev->dev.bus_id, "%02x", superhyway_devices);
 
 	superhyway_devices++;
···
 	return device_register(&dev->dev);
 }
 
+int superhyway_add_devices(struct superhyway_bus *bus,
+			   struct superhyway_device **devices,
+			   int nr_devices)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < nr_devices; i++) {
+		struct superhyway_device *dev = devices[i];
+		ret |= superhyway_add_device(dev->resource[0].start, dev, bus);
+	}
+
+	return ret;
+}
+
 static int __init superhyway_init(void)
 {
+	struct superhyway_bus *bus;
+	int ret = 0;
+
 	device_register(&superhyway_bus_device);
-	return superhyway_scan_bus();
+
+	for (bus = superhyway_channels; bus->ops; bus++)
+		ret |= superhyway_scan_bus(bus);
+
+	return ret;
 }
 
 postcore_initcall(superhyway_init);
···
 
 EXPORT_SYMBOL(superhyway_bus_type);
 EXPORT_SYMBOL(superhyway_add_device);
+EXPORT_SYMBOL(superhyway_add_devices);
 EXPORT_SYMBOL(superhyway_register_driver);
 EXPORT_SYMBOL(superhyway_unregister_driver);
 

include/linux/superhyway.h

···
  */
 #define SUPERHYWAY_DEVICE_ID_SH5_DMAC	0x0183
 
-struct vcr_info {
+struct superhyway_vcr_info {
 	u8	perr_flags;	/* P-port Error flags */
 	u8	merr_flags;	/* Module Error flags */
 	u16	mod_vers;	/* Module Version */
···
 	u8	bot_mb;		/* Bottom Memory block */
 	u8	top_mb;		/* Top Memory block */
 };
+
+struct superhyway_ops {
+	int (*read_vcr)(unsigned long base, struct superhyway_vcr_info *vcr);
+	int (*write_vcr)(unsigned long base, struct superhyway_vcr_info vcr);
+};
+
+struct superhyway_bus {
+	struct superhyway_ops *ops;
+};
+
+extern struct superhyway_bus superhyway_channels[];
 
 struct superhyway_device_id {
 	unsigned int id;
···
 
 	struct superhyway_device_id id;
 	struct superhyway_driver *drv;
+	struct superhyway_bus *bus;
 
-	struct resource resource;
-	struct vcr_info vcr;
+	int num_resources;
+	struct resource *resource;
+	struct superhyway_vcr_info vcr;
 };
 
 #define to_superhyway_device(d)	container_of((d), struct superhyway_device, dev)
···
 #define superhyway_get_drvdata(d)	dev_get_drvdata(&(d)->dev)
 #define superhyway_set_drvdata(d,p)	dev_set_drvdata(&(d)->dev, (p))
 
-extern int superhyway_scan_bus(void);
+static inline int
+superhyway_read_vcr(struct superhyway_device *dev, unsigned long base,
+		    struct superhyway_vcr_info *vcr)
+{
+	return dev->bus->ops->read_vcr(base, vcr);
+}
+
+static inline int
+superhyway_write_vcr(struct superhyway_device *dev, unsigned long base,
+		     struct superhyway_vcr_info vcr)
+{
+	return dev->bus->ops->write_vcr(base, vcr);
+}
+
+extern int superhyway_scan_bus(struct superhyway_bus *);
 
 /* drivers/sh/superhyway/superhyway.c */
 int superhyway_register_driver(struct superhyway_driver *);
 void superhyway_unregister_driver(struct superhyway_driver *);
-int superhyway_add_device(unsigned int, unsigned long, unsigned long long);
+int superhyway_add_device(unsigned long base, struct superhyway_device *, struct superhyway_bus *);
+int superhyway_add_devices(struct superhyway_bus *bus, struct superhyway_device **devices, int nr_devices);
 
 /* drivers/sh/superhyway/superhyway-sysfs.c */
 extern struct device_attribute superhyway_dev_attrs[];