ichspi: use a variable to distinguish ich generations instead of spi_programmer->type

The type member is enough most of the time to derive the wanted
information, but
 - not always (e.g. ich_set_bbar),
 - only available after registration, which we want to delay till the
   end of init, and
 - we really want to distinguish between chipset version-grained
   attributes which are not reflected by the registered programmer.

Hence this patch introduces a new static variable which is set up
early by the init functions and allows us to get rid of all "switch
(spi_programmer->type)" in ichspi.c. We reuse the enum introduced
for descriptor mode for the type of the new variable.

Previously magic numbers were passed by chipset_enable wrappers. Now
they use the enumeration items too. To get this working the enum
definition had to be moved to programmer.h.

Another noteworthy detail: previously we have checked for a valid
programmer/ich generation all over the place. I have removed those
checks and added one single check in the init method. Calling any
function of a programmer without executing the init method first, is
undefined behavior.

Corresponding to flashrom svn r1460.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

programmer.h

@@ -579,9 +579,20 @@ void register_spi_programmer(const struct spi_programmer *programmer);
 
 /* ichspi.c */
 #if CONFIG_INTERNAL == 1
+enum ich_chipset {
+	CHIPSET_ICH_UNKNOWN,
+	CHIPSET_ICH7 = 7,
+	CHIPSET_ICH8,
+	CHIPSET_ICH9,
+	CHIPSET_ICH10,
+	CHIPSET_5_SERIES_IBEX_PEAK,
+	CHIPSET_6_SERIES_COUGAR_POINT,
+	CHIPSET_7_SERIES_PANTHER_POINT
+};
+
 extern uint32_t ichspi_bbar;
 int ich_init_spi(struct pci_dev *dev, uint32_t base, void *rcrb,
-		    int ich_generation);
+		 enum ich_chipset ich_generation);
 int via_init_spi(struct pci_dev *dev);
 
 /* it85spi.c */