[kernel] also make 2.6.27 use the sprom fallback

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14684 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 115 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.27/976-ssb_fallback_sprom.patch b/target/linux/generic-2.6/patches-2.6.27/976-ssb_fallback_sprom.patch
new file mode 100644
index 0000000000..815c37d067
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.27/976-ssb_fallback_sprom.patch
@@ -0,0 +1,115 @@
+Index: linux-2.6.28.7/drivers/ssb/pci.c
+===================================================================
+--- linux-2.6.28.7.orig/drivers/ssb/pci.c	2009-02-26 20:37:02.000000000 +0100
++++ linux-2.6.28.7/drivers/ssb/pci.c	2009-02-26 20:41:44.000000000 +0100
+@@ -514,6 +514,7 @@ unsupported:
+ static int ssb_pci_sprom_get(struct ssb_bus *bus,
+ 			     struct ssb_sprom *sprom)
+ {
++	const struct ssb_sprom *fallback;
+ 	int err = -ENOMEM;
+ 	u16 *buf;
+ 
+@@ -533,12 +534,23 @@ 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: linux-2.6.28.7/drivers/ssb/sprom.c
+===================================================================
+--- linux-2.6.28.7.orig/drivers/ssb/sprom.c	2009-02-26 20:33:21.000000000 +0100
++++ linux-2.6.28.7/drivers/ssb/sprom.c	2009-02-26 20:52:35.000000000 +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: linux-2.6.28.7/drivers/ssb/ssb_private.h
+===================================================================
+--- linux-2.6.28.7.orig/drivers/ssb/ssb_private.h	2009-02-26 20:36:33.000000000 +0100
++++ linux-2.6.28.7/drivers/ssb/ssb_private.h	2009-02-26 20:36:56.000000000 +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: linux-2.6.28.7/include/linux/ssb/ssb.h
+===================================================================
+--- linux-2.6.28.7.orig/include/linux/ssb/ssb.h	2009-02-26 20:26:34.000000000 +0100
++++ linux-2.6.28.7/include/linux/ssb/ssb.h	2009-02-26 20:32:30.000000000 +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);