brcm47xx: sprom for nvram parsing

This adds support for parsing sprom form nvram for sprom version form 1 to 9.
It also adds sprom from nvram support for devices on the bcma bus.


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30638 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-3.2/195-bcma-add-support-for-sprom-not-found-on-the-device.patch b/target/linux/brcm47xx/patches-3.2/195-bcma-add-support-for-sprom-not-found-on-the-device.patch
new file mode 100644
index 0000000000..6991576d2f
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.2/195-bcma-add-support-for-sprom-not-found-on-the-device.patch
@@ -0,0 +1,137 @@
+From 332b8f6ca7da3197c631928b6bd1e7fdca87e109 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Sat, 18 Feb 2012 01:16:35 +0100
+Subject: [PATCH 195/202] 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>
+---
+ drivers/bcma/sprom.c      |   80 ++++++++++++++++++++++++++++++++++++++++----
+ include/linux/bcma/bcma.h |    6 +++
+ 2 files changed, 78 insertions(+), 8 deletions(-)
+
+--- a/drivers/bcma/sprom.c
++++ b/drivers/bcma/sprom.c
+@@ -16,6 +16,49 @@
+ 
+ #define SPOFF(offset)	((offset) / sizeof(u16))
+ 
++static int(*get_fallback_sprom)(struct bcma_bus *dev, struct ssb_sprom *out);
++
++/**
++ * ssb_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
++ * 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 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.
+  **************************************************/
+@@ -205,23 +248,44 @@ static void bcma_sprom_extract_r8(struct
+ 		SSB_SROM8_FEM_ANTSWLUT) >> 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);
++		if (!(sromctrl & BCMA_CC_SROM_CONTROL_PRESENT))
++			return false;
++	}
++	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),
+--- a/include/linux/bcma/bcma.h
++++ b/include/linux/bcma/bcma.h
+@@ -177,6 +177,12 @@ int __bcma_driver_register(struct bcma_d
+ 
+ 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;