--- /dev/null
+/*
+ * Bedbug Functions specific to the PPC405 chip
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/ctype.h>
+#include <bedbug/type.h>
+#include <bedbug/bedbug.h>
+#include <bedbug/regs.h>
+#include <bedbug/ppc.h>
+
+#if defined(CONFIG_CMD_BEDBUG) && defined(CONFIG_4xx)
+
+#define MAX_BREAK_POINTS 4
+
+extern CPU_DEBUG_CTX bug_ctx;
+
+void bedbug405_init __P ((void));
+void bedbug405_do_break __P ((cmd_tbl_t *, int, int, char * const []));
+void bedbug405_break_isr __P ((struct pt_regs *));
+int bedbug405_find_empty __P ((void));
+int bedbug405_set __P ((int, unsigned long));
+int bedbug405_clear __P ((int));
+\f
+
+/* ======================================================================
+ * Initialize the global bug_ctx structure for the AMCC PPC405. Clear all
+ * of the breakpoints.
+ * ====================================================================== */
+
+void bedbug405_init (void)
+{
+ int i;
+
+ /* -------------------------------------------------- */
+
+ bug_ctx.hw_debug_enabled = 0;
+ bug_ctx.stopped = 0;
+ bug_ctx.current_bp = 0;
+ bug_ctx.regs = NULL;
+
+ bug_ctx.do_break = bedbug405_do_break;
+ bug_ctx.break_isr = bedbug405_break_isr;
+ bug_ctx.find_empty = bedbug405_find_empty;
+ bug_ctx.set = bedbug405_set;
+ bug_ctx.clear = bedbug405_clear;
+
+ for (i = 1; i <= MAX_BREAK_POINTS; ++i)
+ (*bug_ctx.clear) (i);
+
+ puts ("BEDBUG:ready\n");
+ return;
+} /* bedbug_init_breakpoints */
+\f
+
+
+/* ======================================================================
+ * Set/clear/show one of the hardware breakpoints for the 405. The "off"
+ * string will disable a specific breakpoint. The "show" string will
+ * display the current breakpoints. Otherwise an address will set a
+ * breakpoint at that address. Setting a breakpoint uses the CPU-specific
+ * set routine which will assign a breakpoint number.
+ * ====================================================================== */
+
+void bedbug405_do_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+{
+ long addr = 0; /* Address to break at */
+ int which_bp; /* Breakpoint number */
+
+ /* -------------------------------------------------- */
+
+ if (argc < 2) {
+ cmd_usage(cmdtp);
+ return;
+ }
+
+ /* Turn off a breakpoint */
+
+ if (strcmp (argv[1], "off") == 0) {
+ if (bug_ctx.hw_debug_enabled == 0) {
+ printf ("No breakpoints enabled\n");
+ return;
+ }
+
+ which_bp = simple_strtoul (argv[2], NULL, 10);
+
+ if (bug_ctx.clear)
+ (*bug_ctx.clear) (which_bp);
+
+ printf ("Breakpoint %d removed\n", which_bp);
+ return;
+ }
+
+ /* Show a list of breakpoints */
+
+ if (strcmp (argv[1], "show") == 0) {
+ for (which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp) {
+
+ switch (which_bp) {
+ case 1:
+ addr = GET_IAC1 ();
+ break;
+ case 2:
+ addr = GET_IAC2 ();
+ break;
+ case 3:
+ addr = GET_IAC3 ();
+ break;
+ case 4:
+ addr = GET_IAC4 ();
+ break;
+ }
+
+ printf ("Breakpoint [%d]: ", which_bp);
+ if (addr == 0)
+ printf ("NOT SET\n");
+ else
+ disppc ((unsigned char *) addr, 0, 1, bedbug_puts,
+ F_RADHEX);
+ }
+ return;
+ }
+
+ /* Set a breakpoint at the address */
+
+ if (!isdigit (argv[1][0])) {
+ cmd_usage(cmdtp);
+ return;
+ }
+
+ addr = simple_strtoul (argv[1], NULL, 16) & 0xfffffffc;
+
+ if ((bug_ctx.set) && (which_bp = (*bug_ctx.set) (0, addr)) > 0) {
+ printf ("Breakpoint [%d]: ", which_bp);
+ disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
+ }
+
+ return;
+} /* bedbug405_do_break */
+\f
+
+
+/* ======================================================================
+ * Handle a breakpoint. First determine which breakpoint was hit by
+ * looking at the DeBug Status Register (DBSR), clear the breakpoint
+ * and enter a mini main loop. Stay in the loop until the stopped flag
+ * in the debug context is cleared.
+ * ====================================================================== */
+
+void bedbug405_break_isr (struct pt_regs *regs)
+{
+ unsigned long dbsr_val; /* Value of the DBSR */
+ unsigned long addr = 0; /* Address stopped at */
+
+ /* -------------------------------------------------- */
+
+ dbsr_val = GET_DBSR ();
+
+ if (dbsr_val & DBSR_IA1) {
+ bug_ctx.current_bp = 1;
+ addr = GET_IAC1 ();
+ SET_DBSR (DBSR_IA1); /* Write a 1 to clear */
+ } else if (dbsr_val & DBSR_IA2) {
+ bug_ctx.current_bp = 2;
+ addr = GET_IAC2 ();
+ SET_DBSR (DBSR_IA2); /* Write a 1 to clear */
+ } else if (dbsr_val & DBSR_IA3) {
+ bug_ctx.current_bp = 3;
+ addr = GET_IAC3 ();
+ SET_DBSR (DBSR_IA3); /* Write a 1 to clear */
+ } else if (dbsr_val & DBSR_IA4) {
+ bug_ctx.current_bp = 4;
+ addr = GET_IAC4 ();
+ SET_DBSR (DBSR_IA4); /* Write a 1 to clear */
+ }
+
+ bedbug_main_loop (addr, regs);
+ return;
+} /* bedbug405_break_isr */
+\f
+
+
+/* ======================================================================
+ * Look through all of the hardware breakpoints available to see if one
+ * is unused.
+ * ====================================================================== */
+
+int bedbug405_find_empty (void)
+{
+ /* -------------------------------------------------- */
+
+ if (GET_IAC1 () == 0)
+ return 1;
+
+ if (GET_IAC2 () == 0)
+ return 2;
+
+ if (GET_IAC3 () == 0)
+ return 3;
+
+ if (GET_IAC4 () == 0)
+ return 4;
+
+ return 0;
+} /* bedbug405_find_empty */
+\f
+
+
+/* ======================================================================
+ * Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
+ * number, otherwise reassign the given breakpoint. If hardware debugging
+ * is not enabled, then turn it on via the MSR and DBCR0. Set the break
+ * address in the appropriate IACx register and enable proper address
+ * beakpoint in DBCR0.
+ * ====================================================================== */
+
+int bedbug405_set (int which_bp, unsigned long addr)
+{
+ /* -------------------------------------------------- */
+
+ /* Only look if which_bp == 0, else use which_bp */
+ if ((bug_ctx.find_empty) && (!which_bp) &&
+ (which_bp = (*bug_ctx.find_empty) ()) == 0) {
+ printf ("All breakpoints in use\n");
+ return 0;
+ }
+
+ if (which_bp < 1 || which_bp > MAX_BREAK_POINTS) {
+ printf ("Invalid break point # %d\n", which_bp);
+ return 0;
+ }
+
+ if (!bug_ctx.hw_debug_enabled) {
+ SET_MSR (GET_MSR () | 0x200); /* set MSR[ DE ] */
+ SET_DBCR0 (GET_DBCR0 () | DBCR0_IDM);
+ bug_ctx.hw_debug_enabled = 1;
+ }
+
+ switch (which_bp) {
+ case 1:
+ SET_IAC1 (addr);
+ SET_DBCR0 (GET_DBCR0 () | DBCR0_IA1);
+ break;
+
+ case 2:
+ SET_IAC2 (addr);
+ SET_DBCR0 (GET_DBCR0 () | DBCR0_IA2);
+ break;
+
+ case 3:
+ SET_IAC3 (addr);
+ SET_DBCR0 (GET_DBCR0 () | DBCR0_IA3);
+ break;
+
+ case 4:
+ SET_IAC4 (addr);
+ SET_DBCR0 (GET_DBCR0 () | DBCR0_IA4);
+ break;
+ }
+
+ return which_bp;
+} /* bedbug405_set */
+\f
+
+
+/* ======================================================================
+ * Disable a specific breakoint by setting the appropriate IACx register
+ * to zero and claring the instruction address breakpoint in DBCR0.
+ * ====================================================================== */
+
+int bedbug405_clear (int which_bp)
+{
+ /* -------------------------------------------------- */
+
+ if (which_bp < 1 || which_bp > MAX_BREAK_POINTS) {
+ printf ("Invalid break point # (%d)\n", which_bp);
+ return -1;
+ }
+
+ switch (which_bp) {
+ case 1:
+ SET_IAC1 (0);
+ SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA1);
+ break;
+
+ case 2:
+ SET_IAC2 (0);
+ SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA2);
+ break;
+
+ case 3:
+ SET_IAC3 (0);
+ SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA3);
+ break;
+
+ case 4:
+ SET_IAC4 (0);
+ SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA4);
+ break;
+ }
+
+ return 0;
+} /* bedbug405_clear */
+
+
+/* ====================================================================== */
+#endif
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