[PATCH] Split AMD CS5536 chipset enable

[Carl-Daniel Hailfinger]

Split AMD CS5536 chipset enable in a processor function (Geode RCONF)
and a southbridge function (CS5536 NOR flash control).
This patch has no functional changes.

Is it possible to combine a Geode LX with a CS5535 or even a CS5530?
Is it possible to combine a Geode GX (or earlier) with a CS5536?
If the answer to any of the questions above is "yes", the split probably
makes sense and we should execute the processor specific enable function
inside the new processor enable routine in flashrom.

Signed-off-by: Carl-Daniel Hailfinger

Index: flashrom-geodelx_cs5536_chipsetenable_split/chipset_enable.c
===================================================================
--- flashrom-geodelx_cs5536_chipsetenable_split/chipset_enable.c	(Revision 1035)
+++ flashrom-geodelx_cs5536_chipsetenable_split/chipset_enable.c	(Arbeitskopie)
@@ -728,16 +728,12 @@

/**
  * Geode systems write protect the BIOS via RCONFs (cache settings similar
- * to MTRRs). To unlock, change MSR 0x1808 top byte to 0x22. 
- *
- * Geode systems also write protect the NOR flash chip itself via MSR_NORF_CTL.
- * To enable write to NOR Boot flash for the benefit of systems that have such
- * a setup, raise MSR 0x51400018 WE_CS3 (write enable Boot Flash Chip Select).
+ * to MTRRs). To unlock, change MSR 0x1808 top byte to 0x22.
+ * FIXME: Is this only for Geode LX or also for other Geode models?
  */
-static int enable_flash_cs5536(struct pci_dev *dev, const char *name)
+static int enable_flash_geode(void)
 {
 #define MSR_RCONF_DEFAULT	0x1808
-#define MSR_NORF_CTL		0x51400018

msr_t msr;

@@ -751,6 +747,30 @@
    	wrmsr(MSR_RCONF_DEFAULT, msr);
    }

+	cleanup_cpu_msr();
+
+#undef MSR_RCONF_DEFAULT
+	return 0;
+}
+
+/**
+ * CS5536 systems also write protect the NOR flash chip itself via MSR_NORF_CTL.
+ * To enable write to NOR Boot flash for the benefit of systems that have such
+ * a setup, raise MSR 0x51400018 WE_CS3 (write enable Boot Flash Chip Select).
+ */
+static int enable_flash_cs5536(struct pci_dev *dev, const char *name)
+{
+#define MSR_NORF_CTL		0x51400018
+
+	msr_t msr;
+
+	if (enable_flash_geode())
+		return -1;
+
+	/* Geode only has a single core */
+	if (setup_cpu_msr(0))
+		return -1;
+
    msr = rdmsr(MSR_NORF_CTL);
    /* Raise WE_CS3 bit. */
    msr.lo |= 0x08;
@@ -758,7 +778,6 @@

cleanup_cpu_msr();

-#undef MSR_RCONF_DEFAULT
 #undef MSR_NORF_CTL
    return 0;
 }