* Add variable CPU clock for MPC859/866 systems (so far only TQM866M):

see doc/README.MPC866 for details;
  implement workaround for "SIU4" and "SIU9" silicon bugs on MPC866;
  calculate CPU clock frequency from PLL register values.

* Add support for 128 MB RAM on TQM8xxL/M modules

cpu/mpc8xx/Makefile

@@ -32,16 +32,17 @@ OBJS	= bedbug_860.o commproc.o cpu.o cpu_init.o	\
 	  fec.o i2c.o interrupts.o lcd.o scc.o		\
 	  serial.o speed.o spi.o \
 	  traps.o upatch.o video.o
+SOBJS	= plprcr_write.o
 
 all:	.depend $(START) $(LIB)
 
-$(LIB):	$(OBJS)
-	$(AR) crv $@ $(OBJS) kgdb.o
+$(LIB):	$(OBJS) $(SOBJS)
+	$(AR) crv $@ $(OBJS) $(SOBJS) kgdb.o
 
 #########################################################################
 
-.depend:	Makefile $(START:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) > $@
+.depend:	Makefile $(START:.o=.S) $(OBJS:.o=.c) $(SOBJS:.o=.S)
+		$(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) $(SOBJS:.o=.S) > $@
 
 sinclude .depend
 

cpu/mpc8xx/cpu_init.c

@@ -42,7 +42,9 @@ void cpu_init_f (volatile immap_t * immr)
 {
 #ifndef CONFIG_MBX
 	volatile memctl8xx_t *memctl = &immr->im_memctl;
+# ifdef CFG_PLPRCR
 	ulong mfmask;
+# endif
 #endif
 	ulong reg;
 
@@ -92,6 +94,7 @@ void cpu_init_f (volatile immap_t * immr)
 	 *
 	 * For newer (starting MPC866) chips PLPRCR layout is different.
 	 */
+#ifdef CFG_PLPRCR
 	if (get_immr(0xFFFF) >= MPC8xx_NEW_CLK)
 	   mfmask = PLPRCR_MFACT_MSK;
 	else
@@ -105,6 +108,7 @@ void cpu_init_f (volatile immap_t * immr)
 	   reg |= CFG_PLPRCR;			/* reset control bits   */
 	}
 	immr->im_clkrst.car_plprcr = reg;
+#endif
 
 	/*
 	 * Memory Controller:

cpu/mpc8xx/plprcr_write.S

@@ -0,0 +1,145 @@
+/*
+ * (C) Copyright 2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <mpc8xx.h>
+#include <ppc_asm.tmpl>
+#include <asm/cache.h>
+
+#define CACHE_CMD_ENABLE	0x02000000
+#define CACHE_CMD_DISABLE	0x04000000
+#define CACHE_CMD_LOAD_LOCK	0x06000000
+#define CACHE_CMD_UNLOCK_LINE	0x08000000
+#define CACHE_CMD_UNLOCK_ALL	0x0A000000
+#define CACHE_CMD_INVALIDATE	0x0C000000
+#define SPEED_PLPRCR_WAIT_5CYC	150
+#define _CACHE_ALIGN_SIZE	16
+
+
+	.text
+	.align 2
+	.globl plprcr_write_866
+
+/*
+ * void plprcr_write_866 (long plprcr)
+ * Write PLPRCR, including workaround for device errata SIU4 and SIU9.
+ */
+
+plprcr_write_866:
+	mfspr	r10, LR		/* save the Link Register value */
+
+	/* turn instruction cache on (no MMU required for instructions)
+	 */
+	lis	r4, CACHE_CMD_ENABLE@h
+	ori	r4, r4, CACHE_CMD_ENABLE@l
+	mtspr	IC_CST, r4
+	isync
+
+	/* clear IC_CST error bits
+	 */
+	mfspr	r4, IC_CST
+
+	bl	plprcr_here
+
+plprcr_here:
+	mflr	r5
+
+	/* calculate relocation offset
+	 */
+	lis	r4, plprcr_here@h
+	ori	r4, r4, plprcr_here@l
+	sub	r5, r5, r4
+
+	/* calculate first address of this function
+	 */
+	lis	r6, plprcr_write_866@h
+	ori	r6, r6, plprcr_write_866@l
+	add	r6, r6, r5
+
+	/* calculate end address of this function
+	 */
+	lis	r7, plprcr_end@h
+	ori	r7, r7, plprcr_end@l
+	add	r7, r7, r5
+
+	/* load and lock code addresses
+	 */
+	mr	r5, r6
+
+plprcr_loop:
+	mtspr	IC_ADR, r5
+	addi	r5, r5, _CACHE_ALIGN_SIZE	/* increment by one line */
+
+	lis	r4, CACHE_CMD_LOAD_LOCK@h
+	ori	r4, r4, CACHE_CMD_LOAD_LOCK@l
+	mtspr	IC_CST, r4
+	isync
+
+	cmpw	r5, r7
+	blt	plprcr_loop
+
+	/* IC_CST error bits not evaluated
+	 */
+
+	/* switch PLPRCR
+	 */
+	mfspr	r4, IMMR		/* read IMMR */
+	rlwinm	r4, r4, 0, 0, 15	/* only high 16 bits count */
+
+	/* write sequence according to MPC866 Errata
+	 */
+	stw	r3, PLPRCR(r4)
+	isync
+
+	lis	r3, SPEED_PLPRCR_WAIT_5CYC@h
+	ori	r3, r3, SPEED_PLPRCR_WAIT_5CYC@l
+
+plprcr_wait:
+	cmpwi	r3, 0
+	beq	plprcr_wait_end
+	nop
+	subi	r3, r3, 1
+	b	plprcr_wait
+
+plprcr_wait_end:
+
+	/* turn instruction cache off
+	 */
+	lis	r4, CACHE_CMD_UNLOCK_ALL@h
+	ori	r4, r4, CACHE_CMD_UNLOCK_ALL@l
+	mtspr	IC_CST, r4
+	isync
+
+	lis	r4, CACHE_CMD_INVALIDATE@h
+	ori	r4, r4, CACHE_CMD_INVALIDATE@l
+	mtspr	IC_CST, r4
+	isync
+
+	lis	r4, CACHE_CMD_DISABLE@h
+	ori	r4, r4, CACHE_CMD_DISABLE@l
+	mtspr	IC_CST, r4
+	isync
+
+	mtspr	LR, r10		/* restore original Link Register value */
+	blr
+
+plprcr_end:

cpu/mpc8xx/speed.c

@@ -25,6 +25,8 @@
 #include <mpc8xx.h>
 #include <asm/processor.h>
 
+#ifndef CONFIG_TQM866M
+
 #define PITC_SHIFT 16
 #define PITR_SHIFT 16
 /* pitc values to time for 58/8192 seconds (about 70.8 milliseconds) */
@@ -203,4 +205,117 @@ int get_clocks (void)
 	return (0);
 }
 
+#else /* CONFIG_MPC866_et_al */
+
+static long init_pll_866 (long clk);
+
+/* This function sets up PLL (init_pll_866() is called) and
+ * fills gd->cpu_clk and gd->bus_clk according to the environment
+ * variable 'cpuclk' or to CFG_866_CPUCLK_DEFAULT (if 'cpuclk'
+ * contains invalid value).
+ * This functions requires an MPC866 series CPU.
+ */
+int get_clocks_866 (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+	char              tmp[64];
+	long              cpuclk = 0;
+
+	if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0)
+		cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
+
+	if ((CFG_866_CPUCLK_MIN > cpuclk) || (CFG_866_CPUCLK_MAX < cpuclk))
+		cpuclk = CFG_866_CPUCLK_DEFAULT;
+
+	gd->cpu_clk = init_pll_866 (cpuclk);
+
+	if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0)
+		gd->bus_clk = gd->cpu_clk;
+	else
+		gd->bus_clk = gd->cpu_clk / 2;
+
+	return (0);
+}
+
+/* Adjust sdram refresh rate to actual CPU clock.
+ */
+int sdram_adjust_866 (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+	long              mamr;
+
+	mamr = immr->im_memctl.memc_mamr;
+	mamr &= ~MAMR_PTA_MSK;
+	mamr |= ((gd->cpu_clk / CFG_866_PTA_PER_CLK) << MAMR_PTA_SHIFT);
+	immr->im_memctl.memc_mamr = mamr;
+
+	return (0);
+}
+
+/* Configure PLL for MPC866/859 CPU series
+ * PLL multiplication factor is set to the value nearest to the desired clk,
+ * assuming a oscclk of 10 MHz.
+ */
+static long init_pll_866 (long clk)
+{
+	extern void plprcr_write_866 (long);
+
+	volatile immap_t *immr = (immap_t *) CFG_IMMR;
+	long              n, plprcr;
+	char              mfi, mfn, mfd, s, pdf;
+	long              step_mfi, step_mfn;
+
+	pdf = 0;
+	if (clk < 80000000) {
+		s = 1;
+		step_mfi = CFG_866_OSCCLK / 2;
+		mfd = 14;
+		step_mfn = CFG_866_OSCCLK / 30;
+	} else {
+		s = 0;
+		step_mfi = CFG_866_OSCCLK;
+		mfd = 29;
+		step_mfn = CFG_866_OSCCLK / 30;
+	}
+
+	/* Calculate integer part of multiplication factor
+	 */
+	n = clk / step_mfi;
+	mfi = (char)n;
+
+	/* Calculate numerator of fractional part of multiplication factor
+	 */
+	n = clk - (n * step_mfi);
+	mfn = (char)(n / step_mfn);
+
+	/* Calculate effective clk
+	 */
+	n = (mfi * step_mfi) + (mfn * step_mfn);
+
+	immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
+
+	plprcr = (immr->im_clkrst.car_plprcr & ~(PLPRCR_MFN_MSK
+			| PLPRCR_MFD_MSK | PLPRCR_S_MSK
+			| PLPRCR_MFI_MSK | PLPRCR_DBRMO))
+			| (mfn << PLPRCR_MFN_SHIFT)
+			| (mfd << PLPRCR_MFD_SHIFT)
+			| (s << PLPRCR_S_SHIFT)
+			| (mfi << PLPRCR_MFI_SHIFT)
+			| (pdf << PLPRCR_PDF_SHIFT);
+
+	if( (mfn > 0) && ((mfd / mfn) > 10) )
+		plprcr |= PLPRCR_DBRMO;
+
+	plprcr_write_866 (plprcr);		/* set value using SIU4/9 workaround */
+	immr->im_clkrstk.cark_plprcrk = 0x00000000;
+
+	return (n);
+}
+
+#endif /* CONFIG_MPC866_et_al */
+
 /* ------------------------------------------------------------------------- */