This adds SSB functionality to register a fallback SPROM image from the
architecture setup code.
Weird architectures exist that have half-assed SSB devices without SPROM attached to
their PCI busses. The architecture can register a fallback SPROM image that is
used if no SPROM is found on the SSB device.
Signed-off-by: Michael Buesch <mb@xxxxxxxxx>
Cc: Florian Fainelli <florian@xxxxxxxxxxx>
---
John, please merge in the next feature window.
The actual user of this interface will be merged through the mips tree.
Index: wireless-testing/drivers/ssb/pci.c
===================================================================
--- wireless-testing.orig/drivers/ssb/pci.c 2009-01-23 17:08:11.000000000 +0100
+++ wireless-testing/drivers/ssb/pci.c 2009-02-27 16:47:16.000000000 +0100
@@ -564,6 +564,7 @@ static int sprom_extract(struct ssb_bus
static int ssb_pci_sprom_get(struct ssb_bus *bus,
struct ssb_sprom *sprom)
{
+ const struct ssb_sprom *fallback;
int err = -ENOMEM;
u16 *buf;
@@ -583,12 +584,23 @@ static int ssb_pci_sprom_get(struct ssb_
bus->sprom_size = SSB_SPROMSIZE_WORDS_R4;
sprom_do_read(bus, buf);
err = sprom_check_crc(buf, bus->sprom_size);
- if (err)
+ if (err) {
+ /* All CRC attempts failed.
+ * Maybe there is no SPROM on the device?
+ * If we have a fallback, use that. */
+ fallback = ssb_get_fallback_sprom();
+ if (fallback) {
+ memcpy(sprom, fallback, sizeof(*sprom));
+ err = 0;
+ goto out_free;
+ }
ssb_printk(KERN_WARNING PFX "WARNING: Invalid"
" SPROM CRC (corrupt SPROM)\n");
+ }
}
err = sprom_extract(bus, sprom, buf, bus->sprom_size);
+out_free:
kfree(buf);
out:
return err;
Index: wireless-testing/drivers/ssb/sprom.c
===================================================================
--- wireless-testing.orig/drivers/ssb/sprom.c 2008-12-26 22:47:35.000000000 +0100
+++ wireless-testing/drivers/ssb/sprom.c 2009-02-27 16:47:16.000000000 +0100
@@ -14,6 +14,9 @@
#include "ssb_private.h"
+static const struct ssb_sprom *fallback_sprom;
+
+
static int sprom2hex(const u16 *sprom, char *buf, size_t buf_len,
size_t sprom_size_words)
{
@@ -131,3 +134,36 @@ out:
return res;
return err ? err : count;
}
+
+/**
+ * ssb_arch_set_fallback_sprom - Set a fallback SPROM for use if no SPROM is found.
+ *
+ * @sprom: The SPROM data structure to register.
+ *
+ * With this function the architecture implementation may register a fallback
+ * SPROM data structure. The fallback is only used for PCI based SSB devices,
+ * where no valid SPROM can be found in the shadow registers.
+ *
+ * This function is useful for weird architectures that have a half-assed SSB device
+ * hardwired to their PCI bus.
+ *
+ * Note that it does only work with PCI attached SSB devices. PCMCIA devices currently
+ * don't use this fallback.
+ * Architectures must provide the SPROM for native SSB devices anyway,
+ * so the fallback also isn't used for native devices.
+ *
+ * This function is available for architecture code, only. So it is not exported.
+ */
+int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom)
+{
+ if (fallback_sprom)
+ return -EEXIST;
+ fallback_sprom = sprom;
+
+ return 0;
+}
+
+const struct ssb_sprom *ssb_get_fallback_sprom(void)
+{
+ return fallback_sprom;
+}
Index: wireless-testing/drivers/ssb/ssb_private.h
===================================================================
--- wireless-testing.orig/drivers/ssb/ssb_private.h 2008-12-26 22:47:35.000000000 +0100
+++ wireless-testing/drivers/ssb/ssb_private.h 2009-02-27 16:47:16.000000000 +0100
@@ -131,6 +131,7 @@ ssize_t ssb_attr_sprom_store(struct ssb_
const char *buf, size_t count,
int (*sprom_check_crc)(const u16 *sprom, size_t size),
int (*sprom_write)(struct ssb_bus *bus, const u16 *sprom));
+extern const struct ssb_sprom *ssb_get_fallback_sprom(void);
/* core.c */
Index: wireless-testing/include/linux/ssb/ssb.h
===================================================================
--- wireless-testing.orig/include/linux/ssb/ssb.h 2009-02-04 19:45:14.000000000 +0100
+++ wireless-testing/include/linux/ssb/ssb.h 2009-02-27 16:47:16.000000000 +0100
@@ -339,6 +339,10 @@ extern int ssb_bus_pcmciabus_register(st
extern void ssb_bus_unregister(struct ssb_bus *bus);
+/* Set a fallback SPROM.
+ * See kdoc at the function definition for complete documentation. */
+extern int ssb_arch_set_fallback_sprom(const struct ssb_sprom *sprom);
+
/* Suspend a SSB bus.
* Call this from the parent bus suspend routine. */
extern int ssb_bus_suspend(struct ssb_bus *bus);
--
Greetings, Michael.
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