5 files changed, 39 insertions, 0 deletions

diff --git a/drivers/ssb/driver_chipcommon.c b/drivers/ssb/driver_chipcommon.c
index 59c3c0fdbec..59ae76bace1 100644
--- a/drivers/ssb/driver_chipcommon.c
+++ b/drivers/ssb/driver_chipcommon.c
@@ -233,6 +233,8 @@ void ssb_chipcommon_init(struct ssb_chipcommon *cc)
 {
         if (!cc->dev)
                 return; /* We don't have a ChipCommon */
+        if (cc->dev->id.revision >= 11)
+                cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT);
         ssb_pmu_init(cc);
         chipco_powercontrol_init(cc);
         ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index 9e50896233a..a4b2b99f2c8 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -620,6 +620,11 @@ static int ssb_pci_sprom_get(struct ssb_bus *bus,
         int err = -ENOMEM;
         u16 *buf;
 
+        if (!ssb_is_sprom_available(bus)) {
+                ssb_printk(KERN_ERR PFX "No SPROM available!\n");
+                return -ENODEV;
+        }
+
         buf = kcalloc(SSB_SPROMSIZE_WORDS_R123, sizeof(u16), GFP_KERNEL);
         if (!buf)
                 goto out;
diff --git a/drivers/ssb/sprom.c b/drivers/ssb/sprom.c
index d0e6762fec5..83bc088b941 100644
--- a/drivers/ssb/sprom.c
+++ b/drivers/ssb/sprom.c
@@ -175,3 +175,17 @@ const struct ssb_sprom *ssb_get_fallback_sprom(void)
 {
         return fallback_sprom;
 }
+
+/* http://bcm-v4.sipsolutions.net/802.11/IsSpromAvailable */
+bool ssb_is_sprom_available(struct ssb_bus *bus)
+{
+        /* status register only exists on chipcomon rev >= 11 and we need check
+           for >= 31 only */
+        /* this routine differs from specs as we do not access SPROM directly
+           on PCMCIA */
+        if (bus->bustype == SSB_BUSTYPE_PCI &&
+            bus->chipco.dev->id.revision >= 31)
+                return bus->chipco.capabilities & SSB_CHIPCO_CAP_SPROM;
+
+        return true;
+}
diff --git a/include/linux/ssb/ssb.h b/include/linux/ssb/ssb.h
index 24f98854736..3b4da233e31 100644
--- a/include/linux/ssb/ssb.h
+++ b/include/linux/ssb/ssb.h
@@ -394,6 +394,9 @@ extern int ssb_bus_sdiobus_register(struct ssb_bus *bus,
 
 extern void ssb_bus_unregister(struct ssb_bus *bus);
 
+/* Does the device have an SPROM? */
+extern bool ssb_is_sprom_available(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);
diff --git a/include/linux/ssb/ssb_driver_chipcommon.h b/include/linux/ssb/ssb_driver_chipcommon.h
index 4e27acf0a92..2cdf249b4e5 100644
--- a/include/linux/ssb/ssb_driver_chipcommon.h
+++ b/include/linux/ssb/ssb_driver_chipcommon.h
@@ -53,6 +53,7 @@
 #define  SSB_CHIPCO_CAP_64BIT           0x08000000      /* 64-bit Backplane */
 #define  SSB_CHIPCO_CAP_PMU             0x10000000      /* PMU available (rev >= 20) */
 #define  SSB_CHIPCO_CAP_ECI             0x20000000      /* ECI available (rev >= 20) */
+#define  SSB_CHIPCO_CAP_SPROM           0x40000000      /* SPROM present */
 #define SSB_CHIPCO_CORECTL              0x0008
 #define  SSB_CHIPCO_CORECTL_UARTCLK0    0x00000001      /* Drive UART with internal clock */
 #define  SSB_CHIPCO_CORECTL_SE          0x00000002      /* sync clk out enable (corerev >= 3) */
@@ -385,6 +386,7 @@
 
 
 /** Chip specific Chip-Status register contents. */
+#define SSB_CHIPCO_CHST_4322_SPROM_EXISTS       0x00000040 /* SPROM present */
 #define SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL      0x00000003
 #define SSB_CHIPCO_CHST_4325_DEFCIS_SEL         0 /* OTP is powered up, use def. CIS, no SPROM */
 #define SSB_CHIPCO_CHST_4325_SPROM_SEL          1 /* OTP is powered up, SPROM is present */
@@ -398,6 +400,18 @@
 #define SSB_CHIPCO_CHST_4325_RCAL_VALUE_SHIFT   4
 #define SSB_CHIPCO_CHST_4325_PMUTOP_2B          0x00000200 /* 1 for 2b, 0 for to 2a */
 
+/** Macros to determine SPROM presence based on Chip-Status register. */
+#define SSB_CHIPCO_CHST_4312_SPROM_PRESENT(status) \
+        ((status & SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL) != \
+                SSB_CHIPCO_CHST_4325_OTP_SEL)
+#define SSB_CHIPCO_CHST_4322_SPROM_PRESENT(status) \
+        (status & SSB_CHIPCO_CHST_4322_SPROM_EXISTS)
+#define SSB_CHIPCO_CHST_4325_SPROM_PRESENT(status) \
+        (((status & SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL) != \
+                SSB_CHIPCO_CHST_4325_DEFCIS_SEL) && \
+         ((status & SSB_CHIPCO_CHST_4325_SPROM_OTP_SEL) != \
+                SSB_CHIPCO_CHST_4325_OTP_SEL))
+
 
 
 /** Clockcontrol masks and values **/
@@ -564,6 +578,7 @@ struct ssb_chipcommon_pmu {
 struct ssb_chipcommon {
         struct ssb_device *dev;
         u32 capabilities;
+        u32 status;
         /* Fast Powerup Delay constant */
         u16 fast_pwrup_delay;
         struct ssb_chipcommon_pmu pmu;