126 lines
3.4 KiB
Diff
126 lines
3.4 KiB
Diff
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--- a/drivers/bcma/sprom.c
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+++ b/drivers/bcma/sprom.c
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@@ -2,6 +2,8 @@
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* Broadcom specific AMBA
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* SPROM reading
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*
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+ * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
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+ *
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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@@ -16,6 +18,45 @@
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#define SPOFF(offset) ((offset) / sizeof(u16))
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+static int(*get_fallback_sprom)(struct bcma_bus *dev, struct ssb_sprom *out);
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+
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+/**
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+ * bcma_arch_register_fallback_sprom - Registers a method providing a
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+ * fallback SPROM if no SPROM is found.
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+ *
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+ * @sprom_callback: The callback function.
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+ *
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+ * With this function the architecture implementation may register a
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+ * callback handler which fills the SPROM data structure. The fallback is
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+ * used for PCI based BCMA devices, where no valid SPROM can be found
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+ * in the shadow registers and to provide the SPROM for SoCs where BCMA is
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+ * to controll the system bus.
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+ *
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+ * This function is useful for weird architectures that have a half-assed
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+ * BCMA device hardwired to their PCI bus.
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+ *
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+ * This function is available for architecture code, only. So it is not
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+ * exported.
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+ */
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+int bcma_arch_register_fallback_sprom(int (*sprom_callback)(struct bcma_bus *bus,
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+ struct ssb_sprom *out))
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+{
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+ if (get_fallback_sprom)
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+ return -EEXIST;
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+ get_fallback_sprom = sprom_callback;
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+
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+ return 0;
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+}
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+
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+static int bcma_fill_sprom_with_fallback(struct bcma_bus *bus,
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+ struct ssb_sprom *out)
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+{
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+ if (!get_fallback_sprom)
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+ return -ENOENT;
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+
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+ return get_fallback_sprom(bus, out);
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+}
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+
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/**************************************************
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* R/W ops.
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**************************************************/
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@@ -205,23 +246,43 @@ static void bcma_sprom_extract_r8(struct
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SSB_SROM8_FEM_ANTSWLUT) >> SSB_SROM8_FEM_ANTSWLUT_SHIFT;
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}
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+static bool bcma_is_sprom_available(struct bcma_bus *bus)
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+{
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+ u32 sromctrl;
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+
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+ if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
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+ return false;
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+
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+ if (bus->drv_cc.core->id.rev >= 32) {
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+ sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
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+ return sromctrl & BCMA_CC_SROM_CONTROL_PRESENT;
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+ }
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+ return true;
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+}
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+
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int bcma_sprom_get(struct bcma_bus *bus)
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{
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u16 offset;
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u16 *sprom;
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- u32 sromctrl;
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int err = 0;
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if (!bus->drv_cc.core)
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return -EOPNOTSUPP;
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- if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
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- return -ENOENT;
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-
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- if (bus->drv_cc.core->id.rev >= 32) {
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- sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
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- if (!(sromctrl & BCMA_CC_SROM_CONTROL_PRESENT))
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- return -ENOENT;
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+ if (!bcma_is_sprom_available(bus)) {
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+ /*
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+ * Maybe there is no SPROM on the device?
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+ * Now we ask the arch code if there is some sprom
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+ * available for this device in some other storage.
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+ */
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+ err = bcma_fill_sprom_with_fallback(bus, &bus->sprom);
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+ if (err) {
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+ pr_warn("Using fallback SPROM failed (err %d)\n", err);
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+ } else {
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+ pr_debug("Using SPROM revision %d provided by"
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+ " platform.\n", bus->sprom.revision);
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+ return 0;
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+ }
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}
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sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
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--- a/include/linux/bcma/bcma.h
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+++ b/include/linux/bcma/bcma.h
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@@ -177,6 +177,12 @@ int __bcma_driver_register(struct bcma_d
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extern void bcma_driver_unregister(struct bcma_driver *drv);
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+/* Set a fallback SPROM.
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+ * See kdoc at the function definition for complete documentation. */
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+extern int bcma_arch_register_fallback_sprom(
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+ int (*sprom_callback)(struct bcma_bus *bus,
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+ struct ssb_sprom *out));
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+
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struct bcma_bus {
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/* The MMIO area. */
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void __iomem *mmio;
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