powerpc: Partialy restore core of mpc8xx

CS Systemes d'Information (CSSI) manufactures 8xx boards for
critical communication systems. Those boards have been
running U-Boot since 2010 and will have to be maintained
until at least 2027.

commit 5b8e76c35ec312a3f73126bd1a2d2c0965b98a9f
("powerpc, 8xx: remove support for 8xx") orphaned those boards
by removing support for the mpc8xx CPU.

This commit partially restores support for the 8xx, with the
following limitations:
- Restores support for MPC866 and MPC885 only
- Does not restore IDE, PCMCIA, I2C, USB
- Does not restore examples
- Does not restore POST
- Does not restore Ethernet on SCC
- Does not restore console on SCC
- Does not restore bedbug and kgdb support

As the 866 and 885 do not support the following features,
they are not restored either:
- VIDEO / LCD
- RTC clock

The CPM uCODE patch is not restored either, because:
- 866 and 885 already have support for I2C and SPI relocation
without a uCODE patch
- relocation of SMC, I2C or SPI is only needed for using SCCs
for Ethernet or QMC

The dynamic setup/calculation of clocks is removed, we
expect the target being use with the clock and PLPRCR register
defined in the configuration.
All the clock settings for 8xx prior to 866 is removed as
well as we now only support 866 and 885.

This code is mature and addresses mature boards. Therefore
all code enclosed in '#if 0/#endif' and '#if XX_DEBUG/#endif'
is unneeded.

The following files are not restored by this patch:

- arch/powerpc/cpu/mpc8xx/bedbug_860.c
- arch/powerpc/cpu/mpc8xx/fec.h
- arch/powerpc/cpu/mpc8xx/kgdb.S
- arch/powerpc/cpu/mpc8xx/plprcr_write.S
- arch/powerpc/cpu/mpc8xx/scc.c
- arch/powerpc/cpu/mpc8xx/upatch.c
- arch/powerpc/cpu/mpc8xx/video.c
- arch/powerpc/include/asm/status_led.h
- arch/powerpc/lib/ide.c
- arch/powerpc/lib/ide.h
- doc/README.MPC866
- drivers/pcmcia/mpc8xx_pcmcia.c
- drivers/rtc/mpc8xx.c
- drivers/usb/gadget/mpc8xx_udc.c
- drivers/video/mpc8xx_lcd.c
- examples/standalone/test_burst.c
- examples/standalone/test_burst.h
- examples/standalone/test_burst_lib.S
- examples/standalone/timer.c
- include/mpc823_lcd.h
- include/usb/mpc8xx_udc.h
- post/cpu/mpc8xx/Makefile
- post/cpu/mpc8xx/cache.c
- post/cpu/mpc8xx/cache_8xx.S
- post/cpu/mpc8xx/ether.c
- post/cpu/mpc8xx/spr.c
- post/cpu/mpc8xx/uart.c
- post/cpu/mpc8xx/usb.c
- post/cpu/mpc8xx/watchdog.c

Some of the restored files are not located in a proper location.
In order to keep traceability of the changes, they will be
moved to their correct location and moved to Kconfig in a
followup patch.

This patch also declares CSSI as point of contact for the update
of the 8xx platform, as those boards are the only ones still
being maintained on the 8xx area. A later patch will add
those boards to the tree.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

1 files changed, 46 insertions, 0 deletions

diff --git a/include/ppc_asm.tmpl b/include/ppc_asm.tmpl
index ce71ee9bc9..18783340d9 100644
--- a/include/ppc_asm.tmpl
+++ b/include/ppc_asm.tmpl
@@ -81,6 +81,52 @@
 #define	r30	30
 #define	r31	31
 
+#if defined(CONFIG_8xx)
+
+/* Some special registers */
+
+#define ICR	148	/* Interrupt Cause Register (37-44) */
+#define DER	149
+#define COUNTA	150	/* Breakpoint Counter	    (37-44) */
+#define COUNTB	151	/* Breakpoint Counter	    (37-44) */
+#define LCTRL1	156	/* Load/Store Support	    (37-40) */
+#define LCTRL2	157	/* Load/Store Support	    (37-41) */
+#define ICTRL	158
+
+#endif	/* CONFIG_8xx */
+
+
+#if defined(CONFIG_8xx)
+
+/* Registers in the processor's internal memory map that we use.
+*/
+#define SYPCR	0x00000004
+#define BR0	0x00000100
+#define OR0	0x00000104
+#define BR1	0x00000108
+#define OR1	0x0000010c
+#define BR2	0x00000110
+#define OR2	0x00000114
+#define BR3	0x00000118
+#define OR3	0x0000011c
+#define BR4	0x00000120
+#define OR4	0x00000124
+
+#define MAR	0x00000164
+#define MCR	0x00000168
+#define MAMR	0x00000170
+#define MBMR	0x00000174
+#define MSTAT	0x00000178
+#define MPTPR	0x0000017a
+#define MDR	0x0000017c
+
+#define TBSCR	0x00000200
+#define TBREFF0	0x00000204
+
+#define PLPRCR	0x00000284
+
+#endif
+
 #define curptr r2
 
 #define SYNC \