[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 <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 89 insertions, 26 deletions

diff --git a/drivers/sh/superhyway/superhyway-sysfs.c b/drivers/sh/superhyway/superhyway-sysfs.c
index dc119ce68e3e..55434330867b 100644
--- a/drivers/sh/superhyway/superhyway-sysfs.c
+++ b/drivers/sh/superhyway/superhyway-sysfs.c
@@ -30,7 +30,7 @@ superhyway_ro_attr(bot_mb, "0x%02x\n", vcr.bot_mb);
 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),
diff --git a/drivers/sh/superhyway/superhyway.c b/drivers/sh/superhyway/superhyway.c
index 28757cb9d246..7bdab2a7f59c 100644
--- a/drivers/sh/superhyway/superhyway.c
+++ b/drivers/sh/superhyway/superhyway.c
@@ -27,19 +27,20 @@ static struct device superhyway_bus_device = {
 
 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
@@ -49,28 +50,40 @@ static void superhyway_device_release(struct device *dev)
  * 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;
+
+        if (!dev) {
+                dev = kmalloc(sizeof(struct superhyway_device), GFP_KERNEL);
+                if (!dev)
+                        return -ENOMEM;
 
-        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->bus = bus;
+        superhyway_read_vcr(dev, base, &dev->vcr);
 
-        dev->id.id = mod_id;
-        sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
+        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->vcr                = *((struct vcr_info *)(&vcr));
-        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++;
@@ -78,10 +91,31 @@ int superhyway_add_device(unsigned int mod_id, unsigned long base,
         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);
@@ -197,6 +231,7 @@ module_exit(superhyway_bus_exit);
 
 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);
 
diff --git a/include/linux/superhyway.h b/include/linux/superhyway.h
index c906c5a0aaef..17ea468fa362 100644
--- a/include/linux/superhyway.h
+++ b/include/linux/superhyway.h
@@ -19,7 +19,7 @@
  */
 #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 */
@@ -28,6 +28,17 @@ struct vcr_info {
         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;
         unsigned long driver_data;
@@ -55,9 +66,11 @@ struct superhyway_device {
 
         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)
@@ -65,12 +78,27 @@ struct superhyway_device {
 #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[];