Initial revision

1 files changed, 516 insertions, 0 deletions

diff --git a/cpu/mpc8xx/cpu.c b/cpu/mpc8xx/cpu.c
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+/*
+ * (C) Copyright 2000-2002
+ * 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
+ */
+
+/*
+ * m8xx.c
+ *
+ * CPU specific code
+ *
+ * written or collected and sometimes rewritten by
+ * Magnus Damm <damm@bitsmart.com>
+ *
+ * minor modifications by
+ * Wolfgang Denk <wd@denx.de>
+ */
+
+#include <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <mpc8xx.h>
+#include <asm/cache.h>
+
+static char *cpu_warning = "\n         " \
+	"*** Warning: CPU Core has Silicon Bugs -- Check the Errata ***";
+
+#if ((defined(CONFIG_MPC860) || defined(CONFIG_MPC855)) && \
+     !defined(CONFIG_MPC862))
+# ifdef	CONFIG_MPC855
+#  define	ID_STR	"PC855"
+# else
+#  define	ID_STR	"PC860"
+# endif
+
+static int check_CPU (long clock, uint pvr, uint immr)
+{
+	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
+	uint k, m;
+	char buf[32];
+	char pre = 'X';
+	char *mid = "xx";
+	char *suf;
+
+	/* the highest 16 bits should be 0x0050 for a 860 */
+
+	if ((pvr >> 16) != 0x0050)
+		return -1;
+
+	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
+	m = 0;
+
+	switch (k) {
+	case 0x00020001: pre = 'p'; suf = ""; break;
+	case 0x00030001: suf = ""; break;
+	case 0x00120003: suf = "A"; break;
+	case 0x00130003: suf = "A3"; break;
+
+	case 0x00200004: suf = "B"; break;
+
+	case 0x00300004: suf = "C"; break;
+	case 0x00310004: suf = "C1"; m = 1;
+		break;
+
+	case 0x00200064: mid = "SR"; suf = "B"; break;
+	case 0x00300065: mid = "SR"; suf = "C"; break;
+	case 0x00310065: mid = "SR"; suf = "C1"; m = 1; break;
+	case 0x05010000: suf = "D3"; m = 1; break;
+	case 0x05020000: suf = "D4"; m = 1; break;
+
+		/* this value is not documented anywhere */
+	case 0x40000000: pre = 'P'; suf = "D"; m = 1; break;
+
+	default: suf = NULL; break;
+	}
+
+	if (suf)
+		printf ("%c" ID_STR "%sZPnn%s", pre, mid, suf);
+	else
+		printf ("unknown M" ID_STR " (0x%08x)", k);
+
+	printf (" at %s MHz:", strmhz (buf, clock));
+
+	printf (" %u kB I-Cache", checkicache () >> 10);
+	printf (" %u kB D-Cache", checkdcache () >> 10);
+
+	/* lets check and see if we're running on a 860T (or P?) */
+
+	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
+	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
+		printf (" FEC present");
+	}
+
+	if (!m) {
+		puts (cpu_warning);
+	}
+
+	putc ('\n');
+
+	return 0;
+}
+
+#elif defined(CONFIG_MPC862)
+
+static int check_CPU (long clock, uint pvr, uint immr)
+{
+	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
+	uint k, m;
+	char buf[32];
+	char pre = 'X';
+	char *mid = "xx";
+	char *suf;
+
+	/* the highest 16 bits should be 0x0050 for a 8xx */
+
+	if ((pvr >> 16) != 0x0050)
+		return -1;
+
+	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
+	m = 0;
+
+	switch (k) {
+
+		/* this value is not documented anywhere */
+	case 0x06000000: mid = "P"; suf = "0"; break;
+	case 0x06010001: mid = "P"; suf = "A"; m = 1; break;
+	case 0x07000003: mid = "P"; suf = "B"; m = 1; break;
+	default: suf = NULL; break;
+	}
+
+	if (suf)
+		printf ("%cPC862%sZPnn%s", pre, mid, suf);
+	else
+		printf ("unknown MPC862 (0x%08x)", k);
+
+	printf (" at %s MHz:", strmhz (buf, clock));
+
+	printf (" %u kB I-Cache", checkicache () >> 10);
+	printf (" %u kB D-Cache", checkdcache () >> 10);
+
+	/* lets check and see if we're running on a 862T (or P?) */
+
+	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
+	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
+		printf (" FEC present");
+	}
+
+	if (!m) {
+		puts (cpu_warning);
+	}
+
+	putc ('\n');
+
+	return 0;
+}
+
+#elif defined(CONFIG_MPC823)
+
+static int check_CPU (long clock, uint pvr, uint immr)
+{
+	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
+	uint k, m;
+	char buf[32];
+	char *suf;
+
+	/* the highest 16 bits should be 0x0050 for a 8xx */
+
+	if ((pvr >> 16) != 0x0050)
+		return -1;
+
+	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
+	m = 0;
+
+	switch (k) {
+		/* MPC823 */
+	case 0x20000000: suf = "0"; break;
+	case 0x20010000: suf = "0.1"; break;
+	case 0x20020000: suf = "Z2/3"; break;
+	case 0x20020001: suf = "Z3"; break;
+	case 0x21000000: suf = "A"; break;
+	case 0x21010000: suf = "B"; m = 1; break;
+	case 0x21010001: suf = "B2"; m = 1; break;
+		/* MPC823E */
+	case 0x24010000: suf = NULL;
+			puts ("PPC823EZTnnB2");
+			m = 1;
+			break;
+	default:
+			suf = NULL;
+			printf ("unknown MPC823 (0x%08x)", k);
+			break;
+	}
+	if (suf)
+		printf ("PPC823ZTnn%s", suf);
+
+	printf (" at %s MHz:", strmhz (buf, clock));
+
+	printf (" %u kB I-Cache", checkicache () >> 10);
+	printf (" %u kB D-Cache", checkdcache () >> 10);
+
+	/* lets check and see if we're running on a 860T (or P?) */
+
+	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
+	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
+		puts (" FEC present");
+	}
+
+	if (!m) {
+		puts (cpu_warning);
+	}
+
+	putc ('\n');
+
+	return 0;
+}
+
+#elif defined(CONFIG_MPC850)
+
+static int check_CPU (long clock, uint pvr, uint immr)
+{
+	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
+	uint k, m;
+	char buf[32];
+
+	/* the highest 16 bits should be 0x0050 for a 8xx */
+
+	if ((pvr >> 16) != 0x0050)
+		return -1;
+
+	k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
+	m = 0;
+
+	switch (k) {
+	case 0x20020001:
+		printf ("XPC850xxZT");
+		break;
+	case 0x21000065:
+		printf ("XPC850xxZTA");
+		break;
+	case 0x21010067:
+		printf ("XPC850xxZTB");
+		m = 1;
+		break;
+	case 0x21020068:
+		printf ("XPC850xxZTC");
+		m = 1;
+		break;
+	default:
+		printf ("unknown MPC850 (0x%08x)", k);
+	}
+	printf (" at %s MHz:", strmhz (buf, clock));
+
+	printf (" %u kB I-Cache", checkicache () >> 10);
+	printf (" %u kB D-Cache", checkdcache () >> 10);
+
+	/* lets check and see if we're running on a 850T (or P?) */
+
+	immap->im_cpm.cp_fec.fec_addr_low = 0x12345678;
+	if (immap->im_cpm.cp_fec.fec_addr_low == 0x12345678) {
+		printf (" FEC present");
+	}
+
+	if (!m) {
+		puts (cpu_warning);
+	}
+
+	putc ('\n');
+
+	return 0;
+}
+#else
+#error CPU undefined
+#endif
+/* ------------------------------------------------------------------------- */
+
+int checkcpu (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	ulong clock = gd->cpu_clk;
+	uint immr = get_immr (0);	/* Return full IMMR contents */
+	uint pvr = get_pvr ();
+
+	puts ("CPU:   ");
+
+	/* 850 has PARTNUM 20 */
+	/* 801 has PARTNUM 10 */
+	return check_CPU (clock, pvr, immr);
+}
+
+/* ------------------------------------------------------------------------- */
+/* L1 i-cache                                                                */
+/* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB)              */
+/* the 860 P (plus) has 256 sets of 16 bytes in 4 ways (= 16 kB)             */
+
+int checkicache (void)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	u32 cacheon = rd_ic_cst () & IDC_ENABLED;
+
+#ifdef CONFIG_IP860
+	u32 k = memctl->memc_br1 & ~0x00007fff;	/* probe in flash memoryarea */
+#else
+	u32 k = memctl->memc_br0 & ~0x00007fff;	/* probe in flash memoryarea */
+#endif
+	u32 m;
+	u32 lines = -1;
+
+	wr_ic_cst (IDC_UNALL);
+	wr_ic_cst (IDC_INVALL);
+	wr_ic_cst (IDC_DISABLE);
+	__asm__ volatile ("isync");
+
+	while (!((m = rd_ic_cst ()) & IDC_CERR2)) {
+		wr_ic_adr (k);
+		wr_ic_cst (IDC_LDLCK);
+		__asm__ volatile ("isync");
+
+		lines++;
+		k += 0x10;				/* the number of bytes in a cacheline */
+	}
+
+	wr_ic_cst (IDC_UNALL);
+	wr_ic_cst (IDC_INVALL);
+
+	if (cacheon)
+		wr_ic_cst (IDC_ENABLE);
+	else
+		wr_ic_cst (IDC_DISABLE);
+
+	__asm__ volatile ("isync");
+
+	return lines << 4;
+};
+
+/* ------------------------------------------------------------------------- */
+/* L1 d-cache                                                                */
+/* the standard 860 has 128 sets of 16 bytes in 2 ways (= 4 kB)              */
+/* the 860 P (plus) has 256 sets of 16 bytes in 2 ways (= 8 kB)              */
+/* call with cache disabled                                                  */
+
+int checkdcache (void)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	u32 cacheon = rd_dc_cst () & IDC_ENABLED;
+
+#ifdef CONFIG_IP860
+	u32 k = memctl->memc_br1 & ~0x00007fff;	/* probe in flash memoryarea */
+#else
+	u32 k = memctl->memc_br0 & ~0x00007fff;	/* probe in flash memoryarea */
+#endif
+	u32 m;
+	u32 lines = -1;
+
+	wr_dc_cst (IDC_UNALL);
+	wr_dc_cst (IDC_INVALL);
+	wr_dc_cst (IDC_DISABLE);
+
+	while (!((m = rd_dc_cst ()) & IDC_CERR2)) {
+		wr_dc_adr (k);
+		wr_dc_cst (IDC_LDLCK);
+		lines++;
+		k += 0x10;	/* the number of bytes in a cacheline */
+	}
+
+	wr_dc_cst (IDC_UNALL);
+	wr_dc_cst (IDC_INVALL);
+
+	if (cacheon)
+		wr_dc_cst (IDC_ENABLE);
+	else
+		wr_dc_cst (IDC_DISABLE);
+
+	return lines << 4;
+};
+
+/* ------------------------------------------------------------------------- */
+
+void upmconfig (uint upm, uint * table, uint size)
+{
+	uint i;
+	uint addr = 0;
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+
+	for (i = 0; i < size; i++) {
+		memctl->memc_mdr = table[i];	/* (16-15) */
+		memctl->memc_mcr = addr | upm;	/* (16-16) */
+		addr++;
+	}
+}
+
+/* ------------------------------------------------------------------------- */
+
+int do_reset (cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc,
+			  char *argv[])
+{
+	ulong msr, addr;
+
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+
+	immap->im_clkrst.car_plprcr |= PLPRCR_CSR;	/* Checkstop Reset enable */
+
+	/* Interrupts and MMU off */
+	__asm__ volatile ("mtspr    81, 0");
+	__asm__ volatile ("mfmsr    %0":"=r" (msr));
+
+	msr &= ~0x1030;
+	__asm__ volatile ("mtmsr    %0"::"r" (msr));
+
+	/*
+	 * Trying to execute the next instruction at a non-existing address
+	 * should cause a machine check, resulting in reset
+	 */
+#ifdef CFG_RESET_ADDRESS
+	addr = CFG_RESET_ADDRESS;
+#else
+	/*
+	 * note: when CFG_MONITOR_BASE points to a RAM address, CFG_MONITOR_BASE
+	 * - sizeof (ulong) is usually a valid address. Better pick an address
+	 * known to be invalid on your system and assign it to CFG_RESET_ADDRESS.
+	 * "(ulong)-1" used to be a good choice for many systems...
+	 */
+	addr = CFG_MONITOR_BASE - sizeof (ulong);
+#endif
+	((void (*)(void)) addr) ();
+	return 1;
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Get timebase clock frequency (like cpu_clk in Hz)
+ *
+ * See table 15-5 pp. 15-16, and SCCR[RTSEL] pp. 15-27.
+ */
+unsigned long get_tbclk (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	volatile immap_t *immr = (volatile immap_t *) CFG_IMMR;
+	ulong oscclk, factor;
+
+	if (immr->im_clkrst.car_sccr & SCCR_TBS) {
+		return (gd->cpu_clk / 16);
+	}
+
+	factor = (((CFG_PLPRCR) & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT) + 1;
+
+	oscclk = gd->cpu_clk / factor;
+
+	if ((immr->im_clkrst.car_sccr & SCCR_RTSEL) == 0 || factor > 2) {
+		return (oscclk / 4);
+	}
+	return (oscclk / 16);
+}
+
+/* ------------------------------------------------------------------------- */
+
+#if defined(CONFIG_WATCHDOG)
+void watchdog_reset (void)
+{
+	int re_enable = disable_interrupts ();
+
+	reset_8xx_watchdog ((immap_t *) CFG_IMMR);
+	if (re_enable)
+		enable_interrupts ();
+}
+
+void reset_8xx_watchdog (volatile immap_t * immr)
+{
+# if defined(CONFIG_LWMON)
+	/*
+	 * The LWMON board uses a MAX6301 Watchdog
+	 * with the trigger pin connected to port PA.7
+	 *
+	 * (The old board version used a MAX706TESA Watchdog, which
+	 * had to be handled exactly the same.)
+	 */
+# define WATCHDOG_BIT	0x0100
+	immr->im_ioport.iop_papar &= ~(WATCHDOG_BIT);	/* GPIO     */
+	immr->im_ioport.iop_padir |= WATCHDOG_BIT;	/* Output   */
+	immr->im_ioport.iop_paodr &= ~(WATCHDOG_BIT);	/* active output */
+
+	immr->im_ioport.iop_padat ^= WATCHDOG_BIT;	/* Toggle WDI   */
+# else
+	/*
+	 * All other boards use the MPC8xx Internal Watchdog
+	 */
+	immr->im_siu_conf.sc_swsr = 0x556c;	/* write magic1 */
+	immr->im_siu_conf.sc_swsr = 0xaa39;	/* write magic2 */
+# endif /* CONFIG_LWMON */
+}
+
+#endif /* CONFIG_WATCHDOG */
+
+/* ------------------------------------------------------------------------- */