bcma: add support for sprom not found on the device

On SoCs the sprom is stored in the nvram in a special partition on the
flash chip. The nvram contains the sprom for the main bus, but
sometimes also for a pci devices using bcma. This patch makes it
possible for the arch code to register a function to fetch the needed
sprom from the nvram and provide it to the bcma code.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 75 insertions, 8 deletions

diff --git a/drivers/bcma/sprom.c b/drivers/bcma/sprom.c
index ca7752510d5b..916ae255ff64 100644
--- a/drivers/bcma/sprom.c
+++ b/drivers/bcma/sprom.c
@@ -2,6 +2,8 @@
  * Broadcom specific AMBA
  * SPROM reading
  *
+ * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
+ *
  * Licensed under the GNU/GPL. See COPYING for details.
  */
 
@@ -14,6 +16,45 @@
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 
+static int(*get_fallback_sprom)(struct bcma_bus *dev, struct ssb_sprom *out);
+
+/**
+ * bcma_arch_register_fallback_sprom - Registers a method providing a
+ * fallback SPROM if no SPROM is found.
+ *
+ * @sprom_callback: The callback function.
+ *
+ * With this function the architecture implementation may register a
+ * callback handler which fills the SPROM data structure. The fallback is
+ * used for PCI based BCMA devices, where no valid SPROM can be found
+ * in the shadow registers and to provide the SPROM for SoCs where BCMA is
+ * to controll the system bus.
+ *
+ * This function is useful for weird architectures that have a half-assed
+ * BCMA device hardwired to their PCI bus.
+ *
+ * This function is available for architecture code, only. So it is not
+ * exported.
+ */
+int bcma_arch_register_fallback_sprom(int (*sprom_callback)(struct bcma_bus *bus,
+                                     struct ssb_sprom *out))
+{
+        if (get_fallback_sprom)
+                return -EEXIST;
+        get_fallback_sprom = sprom_callback;
+
+        return 0;
+}
+
+static int bcma_fill_sprom_with_fallback(struct bcma_bus *bus,
+                                         struct ssb_sprom *out)
+{
+        if (!get_fallback_sprom)
+                return -ENOENT;
+
+        return get_fallback_sprom(bus, out);
+}
+
 /**************************************************
  * R/W ops.
  **************************************************/
@@ -246,23 +287,43 @@ static void bcma_sprom_extract_r8(struct bcma_bus *bus, const u16 *sprom)
              SSB_SROM8_FEM_ANTSWLUT_SHIFT);
 }
 
+static bool bcma_is_sprom_available(struct bcma_bus *bus)
+{
+        u32 sromctrl;
+
+        if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
+                return false;
+
+        if (bus->drv_cc.core->id.rev >= 32) {
+                sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
+                return sromctrl & BCMA_CC_SROM_CONTROL_PRESENT;
+        }
+        return true;
+}
+
 int bcma_sprom_get(struct bcma_bus *bus)
 {
         u16 offset;
         u16 *sprom;
-        u32 sromctrl;
         int err = 0;
 
         if (!bus->drv_cc.core)
                 return -EOPNOTSUPP;
 
-        if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
-                return -ENOENT;
-
-        if (bus->drv_cc.core->id.rev >= 32) {
-                sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
-                if (!(sromctrl & BCMA_CC_SROM_CONTROL_PRESENT))
-                        return -ENOENT;
+        if (!bcma_is_sprom_available(bus)) {
+                /*
+                 * Maybe there is no SPROM on the device?
+                 * Now we ask the arch code if there is some sprom
+                 * available for this device in some other storage.
+                 */
+                err = bcma_fill_sprom_with_fallback(bus, &bus->sprom);
+                if (err) {
+                        pr_warn("Using fallback SPROM failed (err %d)\n", err);
+                } else {
+                        pr_debug("Using SPROM revision %d provided by"
+                                 " platform.\n", bus->sprom.revision);
+                        return 0;
+                }
         }
 
         sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
diff --git a/include/linux/bcma/bcma.h b/include/linux/bcma/bcma.h
index 46bbd088c4ad..5af9a075498f 100644
--- a/include/linux/bcma/bcma.h
+++ b/include/linux/bcma/bcma.h
@@ -176,6 +176,12 @@ int __bcma_driver_register(struct bcma_driver *drv, struct module *owner);
 
 extern void bcma_driver_unregister(struct bcma_driver *drv);
 
+/* Set a fallback SPROM.
+ * See kdoc at the function definition for complete documentation. */
+extern int bcma_arch_register_fallback_sprom(
+                int (*sprom_callback)(struct bcma_bus *bus,
+                struct ssb_sprom *out));
+
 struct bcma_bus {
         /* The MMIO area. */
         void __iomem *mmio;