summaryrefslogtreecommitdiff
path: root/cpu/mpc8xx/cpu.c
diff options
context:
space:
mode:
Diffstat (limited to 'cpu/mpc8xx/cpu.c')
-rw-r--r--cpu/mpc8xx/cpu.c516
1 files changed, 516 insertions, 0 deletions
diff --git a/cpu/mpc8xx/cpu.c b/cpu/mpc8xx/cpu.c
new file mode 100644
index 0000000..b1b58b0
--- /dev/null
+++ b/cpu/mpc8xx/cpu.c
@@ -0,0 +1,516 @@
+/*
+ * (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 */
+
+/* ------------------------------------------------------------------------- */