[people/ms/u-boot.git] / cpu / ppc4xx / bedbug_405.c

/*
 * Bedbug Functions specific to the PPC405 chip
 */

#include <common.h>
#include <command.h>
#include <linux/ctype.h>

#include <cmd_bedbug.h>
#include <bedbug/bedbug.h>
#include <bedbug/regs.h>
#include <bedbug/ppc.h>

#if (CONFIG_COMMANDS & CFG_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 *[]));
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 IBM 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 *argv[])
{
	long addr = 0;		/* Address to break at  */
	int which_bp;		/* Breakpoint number    */

	/* -------------------------------------------------- */

	if (argc < 2) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		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])) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		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
Commit	Line	Data
1dda0b1f WD	1	/*
	2	* Bedbug Functions specific to the PPC405 chip
	3	*/
	4
	5	#include <common.h>
	6	#include <command.h>
	7	#include <linux/ctype.h>
	8
	9	#include <cmd_bedbug.h>
	10	#include <bedbug/bedbug.h>
	11	#include <bedbug/regs.h>
	12	#include <bedbug/ppc.h>
	13
	14	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && defined(CONFIG_4xx)
	15
	16	#define MAX_BREAK_POINTS 4
	17
	18	extern CPU_DEBUG_CTX bug_ctx;
	19
	20	void bedbug405_init __P ((void));
	21	void bedbug405_do_break __P ((cmd_tbl_t , int, int, char []));
	22	void bedbug405_break_isr __P ((struct pt_regs *));
	23	int bedbug405_find_empty __P ((void));
	24	int bedbug405_set __P ((int, unsigned long));
	25	int bedbug405_clear __P ((int));
	26	\f
	27
	28	/* ======================================================================
	29	* Initialize the global bug_ctx structure for the IBM PPC405. Clear all
	30	* of the breakpoints.
	31	* ====================================================================== */
	32
	33	void bedbug405_init (void)
	34	{
	35	int i;
	36
	37	/* -------------------------------------------------- */
	38
	39	bug_ctx.hw_debug_enabled = 0;
	40	bug_ctx.stopped = 0;
	41	bug_ctx.current_bp = 0;
	42	bug_ctx.regs = NULL;
	43
	44	bug_ctx.do_break = bedbug405_do_break;
	45	bug_ctx.break_isr = bedbug405_break_isr;
	46	bug_ctx.find_empty = bedbug405_find_empty;
	47	bug_ctx.set = bedbug405_set;
	48	bug_ctx.clear = bedbug405_clear;
	49
	50	for (i = 1; i <= MAX_BREAK_POINTS; ++i)
	51	(*bug_ctx.clear) (i);
	52
	53	puts ("BEDBUG:ready\n");
	54	return;
	55	} /* bedbug_init_breakpoints */
	56	\f
	57
	58
	59	/* ======================================================================
	60	* Set/clear/show one of the hardware breakpoints for the 405. The "off"
	61	* string will disable a specific breakpoint. The "show" string will
	62	* display the current breakpoints. Otherwise an address will set a
	63	* breakpoint at that address. Setting a breakpoint uses the CPU-specific
	64	* set routine which will assign a breakpoint number.
65	* ====================================================================== */
66
67	void bedbug405_do_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
68	{
69	long addr = 0; /* Address to break at */
70	int which_bp; /* Breakpoint number */
71
72	/* -------------------------------------------------- */
73
74	if (argc < 2) {
75	printf ("Usage:\n%s\n", cmdtp->usage);
76	return;
77	}
78
79	/* Turn off a breakpoint */
80
81	if (strcmp (argv[1], "off") == 0) {
82	if (bug_ctx.hw_debug_enabled == 0) {
83	printf ("No breakpoints enabled\n");
84	return;
85	}
86
87	which_bp = simple_strtoul (argv[2], NULL, 10);
88
89	if (bug_ctx.clear)
90	(*bug_ctx.clear) (which_bp);
91
92	printf ("Breakpoint %d removed\n", which_bp);
93	return;
94	}
95
96	/* Show a list of breakpoints */
97
98	if (strcmp (argv[1], "show") == 0) {
99	for (which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp) {
100
101	switch (which_bp) {
102	case 1:
103	addr = GET_IAC1 ();
104	break;
105	case 2:
106	addr = GET_IAC2 ();
107	break;
108	case 3:
109	addr = GET_IAC3 ();
110	break;
111	case 4:
112	addr = GET_IAC4 ();
113	break;
114	}
115
116	printf ("Breakpoint [%d]: ", which_bp);
117	if (addr == 0)
118	printf ("NOT SET\n");
119	else
120	disppc ((unsigned char *) addr, 0, 1, bedbug_puts,
121	F_RADHEX);
122	}
123	return;
124	}
125
126	/* Set a breakpoint at the address */
127
128	if (!isdigit (argv[1][0])) {
129	printf ("Usage:\n%s\n", cmdtp->usage);
130	return;
131	}
132
133	addr = simple_strtoul (argv[1], NULL, 16) & 0xfffffffc;
134
135	if ((bug_ctx.set) && (which_bp = (*bug_ctx.set) (0, addr)) > 0) {
136	printf ("Breakpoint [%d]: ", which_bp);
137	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
138	}
139
140	return;
141	} /* bedbug405_do_break */
142	\f
143
144
145	/* ======================================================================
146	* Handle a breakpoint. First determine which breakpoint was hit by
147	* looking at the DeBug Status Register (DBSR), clear the breakpoint
148	* and enter a mini main loop. Stay in the loop until the stopped flag
149	* in the debug context is cleared.
150	* ====================================================================== */
151
152	void bedbug405_break_isr (struct pt_regs *regs)
153	{
154	unsigned long dbsr_val; /* Value of the DBSR */
155	unsigned long addr = 0; /* Address stopped at */
156
157	/* -------------------------------------------------- */
158
159	dbsr_val = GET_DBSR ();
160
161	if (dbsr_val & DBSR_IA1) {
162	bug_ctx.current_bp = 1;
163	addr = GET_IAC1 ();
164	SET_DBSR (DBSR_IA1); /* Write a 1 to clear */
165	} else if (dbsr_val & DBSR_IA2) {
166	bug_ctx.current_bp = 2;
167	addr = GET_IAC2 ();
168	SET_DBSR (DBSR_IA2); /* Write a 1 to clear */
169	} else if (dbsr_val & DBSR_IA3) {
170	bug_ctx.current_bp = 3;
171	addr = GET_IAC3 ();
172	SET_DBSR (DBSR_IA3); /* Write a 1 to clear */
173	} else if (dbsr_val & DBSR_IA4) {
174	bug_ctx.current_bp = 4;
175	addr = GET_IAC4 ();
176	SET_DBSR (DBSR_IA4); /* Write a 1 to clear */
177	}
178
179	bedbug_main_loop (addr, regs);
180	return;
181	} /* bedbug405_break_isr */
182	\f
183
184
185	/* ======================================================================
186	* Look through all of the hardware breakpoints available to see if one
187	* is unused.
188	* ====================================================================== */
189
190	int bedbug405_find_empty (void)
191	{
192	/* -------------------------------------------------- */
193
194	if (GET_IAC1 () == 0)
195	return 1;
196
197	if (GET_IAC2 () == 0)
198	return 2;
199
200	if (GET_IAC3 () == 0)
201	return 3;
202
203	if (GET_IAC4 () == 0)
204	return 4;
205
206	return 0;
207	} /* bedbug405_find_empty */
208	\f
209
210
211	/* ======================================================================
212	* Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
213	* number, otherwise reassign the given breakpoint. If hardware debugging
214	* is not enabled, then turn it on via the MSR and DBCR0. Set the break
215	* address in the appropriate IACx register and enable proper address
216	* beakpoint in DBCR0.
217	* ====================================================================== */
218
219	int bedbug405_set (int which_bp, unsigned long addr)
220	{
221	/* -------------------------------------------------- */
222
223	/* Only look if which_bp == 0, else use which_bp */
224	if ((bug_ctx.find_empty) && (!which_bp) &&
225	(which_bp = (*bug_ctx.find_empty) ()) == 0) {
226	printf ("All breakpoints in use\n");
227	return 0;
228	}
229
230	if (which_bp < 1 \|\| which_bp > MAX_BREAK_POINTS) {
231	printf ("Invalid break point # %d\n", which_bp);
232	return 0;
233	}
234
235	if (!bug_ctx.hw_debug_enabled) {
236	SET_MSR (GET_MSR () \| 0x200); /* set MSR[ DE ] */
237	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IDM);
238	bug_ctx.hw_debug_enabled = 1;
239	}
240
241	switch (which_bp) {
242	case 1:
243	SET_IAC1 (addr);
244	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA1);
245	break;
246
247	case 2:
248	SET_IAC2 (addr);
249	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA2);
250	break;
251
252	case 3:
253	SET_IAC3 (addr);
254	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA3);
255	break;
256
257	case 4:
258	SET_IAC4 (addr);
259	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA4);
260	break;
261	}
262
263	return which_bp;
264	} /* bedbug405_set */
265	\f
266
267
268	/* ======================================================================
269	* Disable a specific breakoint by setting the appropriate IACx register
270	* to zero and claring the instruction address breakpoint in DBCR0.
271	* ====================================================================== */
272
273	int bedbug405_clear (int which_bp)
274	{
275	/* -------------------------------------------------- */
276
277	if (which_bp < 1 \|\| which_bp > MAX_BREAK_POINTS) {
278	printf ("Invalid break point # (%d)\n", which_bp);
279	return -1;
280	}
281
282	switch (which_bp) {
283	case 1:
284	SET_IAC1 (0);
285	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA1);
286	break;
287
288	case 2:
289	SET_IAC2 (0);
290	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA2);
291	break;
292
293	case 3:
294	SET_IAC3 (0);
295	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA3);
296	break;
297
298	case 4:
299	SET_IAC4 (0);
300	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA4);
301	break;
302	}
303
304	return 0;
305	} /* bedbug405_clear */
306
307
308	/* ====================================================================== */
309	#endif