[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 <bedbug/type.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>
8bde7f77	8	#include <bedbug/type.h>
1dda0b1f WD	9	#include <bedbug/bedbug.h>
	10	#include <bedbug/regs.h>
	11	#include <bedbug/ppc.h>
	12
	13	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG) && defined(CONFIG_4xx)
	14
	15	#define MAX_BREAK_POINTS 4
	16
	17	extern CPU_DEBUG_CTX bug_ctx;
	18
	19	void bedbug405_init __P ((void));
	20	void bedbug405_do_break __P ((cmd_tbl_t , int, int, char []));
	21	void bedbug405_break_isr __P ((struct pt_regs *));
	22	int bedbug405_find_empty __P ((void));
	23	int bedbug405_set __P ((int, unsigned long));
	24	int bedbug405_clear __P ((int));
	25	\f
	26
	27	/* ======================================================================
	28	* Initialize the global bug_ctx structure for the IBM PPC405. Clear all
	29	* of the breakpoints.
	30	* ====================================================================== */
	31
	32	void bedbug405_init (void)
	33	{
	34	int i;
	35
	36	/* -------------------------------------------------- */
	37
	38	bug_ctx.hw_debug_enabled = 0;
	39	bug_ctx.stopped = 0;
	40	bug_ctx.current_bp = 0;
	41	bug_ctx.regs = NULL;
	42
	43	bug_ctx.do_break = bedbug405_do_break;
	44	bug_ctx.break_isr = bedbug405_break_isr;
	45	bug_ctx.find_empty = bedbug405_find_empty;
	46	bug_ctx.set = bedbug405_set;
	47	bug_ctx.clear = bedbug405_clear;
	48
	49	for (i = 1; i <= MAX_BREAK_POINTS; ++i)
	50	(*bug_ctx.clear) (i);
	51
	52	puts ("BEDBUG:ready\n");
	53	return;
	54	} /* bedbug_init_breakpoints */
	55	\f
	56
	57
	58	/* ======================================================================
	59	* Set/clear/show one of the hardware breakpoints for the 405. The "off"
	60	* string will disable a specific breakpoint. The "show" string will
	61	* display the current breakpoints. Otherwise an address will set a
	62	* breakpoint at that address. Setting a breakpoint uses the CPU-specific
	63	* set routine which will assign a breakpoint number.
	64	* ====================================================================== */
	65
	66	void bedbug405_do_break (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
	67	{
	68	long addr = 0; /* Address to break at */
	69	int which_bp; /* Breakpoint number */
	70
	71	/* -------------------------------------------------- */
	72
73	if (argc < 2) {
74	printf ("Usage:\n%s\n", cmdtp->usage);
75	return;
76	}
77
78	/* Turn off a breakpoint */
79
80	if (strcmp (argv[1], "off") == 0) {
81	if (bug_ctx.hw_debug_enabled == 0) {
82	printf ("No breakpoints enabled\n");
83	return;
84	}
85
86	which_bp = simple_strtoul (argv[2], NULL, 10);
87
88	if (bug_ctx.clear)
89	(*bug_ctx.clear) (which_bp);
90
91	printf ("Breakpoint %d removed\n", which_bp);
92	return;
93	}
94
95	/* Show a list of breakpoints */
96
97	if (strcmp (argv[1], "show") == 0) {
98	for (which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp) {
99
100	switch (which_bp) {
101	case 1:
102	addr = GET_IAC1 ();
103	break;
104	case 2:
105	addr = GET_IAC2 ();
106	break;
107	case 3:
108	addr = GET_IAC3 ();
109	break;
110	case 4:
111	addr = GET_IAC4 ();
112	break;
113	}
114
115	printf ("Breakpoint [%d]: ", which_bp);
116	if (addr == 0)
117	printf ("NOT SET\n");
118	else
119	disppc ((unsigned char *) addr, 0, 1, bedbug_puts,
120	F_RADHEX);
121	}
122	return;
123	}
124
125	/* Set a breakpoint at the address */
126
127	if (!isdigit (argv[1][0])) {
128	printf ("Usage:\n%s\n", cmdtp->usage);
129	return;
130	}
131
132	addr = simple_strtoul (argv[1], NULL, 16) & 0xfffffffc;
133
134	if ((bug_ctx.set) && (which_bp = (*bug_ctx.set) (0, addr)) > 0) {
135	printf ("Breakpoint [%d]: ", which_bp);
136	disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
137	}
138
139	return;
140	} /* bedbug405_do_break */
141	\f
142
143
144	/* ======================================================================
145	* Handle a breakpoint. First determine which breakpoint was hit by
146	* looking at the DeBug Status Register (DBSR), clear the breakpoint
147	* and enter a mini main loop. Stay in the loop until the stopped flag
148	* in the debug context is cleared.
149	* ====================================================================== */
150
151	void bedbug405_break_isr (struct pt_regs *regs)
152	{
153	unsigned long dbsr_val; /* Value of the DBSR */
154	unsigned long addr = 0; /* Address stopped at */
155
156	/* -------------------------------------------------- */
157
158	dbsr_val = GET_DBSR ();
159
160	if (dbsr_val & DBSR_IA1) {
161	bug_ctx.current_bp = 1;
162	addr = GET_IAC1 ();
163	SET_DBSR (DBSR_IA1); /* Write a 1 to clear */
164	} else if (dbsr_val & DBSR_IA2) {
165	bug_ctx.current_bp = 2;
166	addr = GET_IAC2 ();
167	SET_DBSR (DBSR_IA2); /* Write a 1 to clear */
168	} else if (dbsr_val & DBSR_IA3) {
169	bug_ctx.current_bp = 3;
170	addr = GET_IAC3 ();
171	SET_DBSR (DBSR_IA3); /* Write a 1 to clear */
172	} else if (dbsr_val & DBSR_IA4) {
173	bug_ctx.current_bp = 4;
174	addr = GET_IAC4 ();
175	SET_DBSR (DBSR_IA4); /* Write a 1 to clear */
176	}
177
178	bedbug_main_loop (addr, regs);
179	return;
180	} /* bedbug405_break_isr */
181	\f
182
183
184	/* ======================================================================
185	* Look through all of the hardware breakpoints available to see if one
186	* is unused.
187	* ====================================================================== */
188
189	int bedbug405_find_empty (void)
190	{
191	/* -------------------------------------------------- */
192
193	if (GET_IAC1 () == 0)
194	return 1;
195
196	if (GET_IAC2 () == 0)
197	return 2;
198
199	if (GET_IAC3 () == 0)
200	return 3;
201
202	if (GET_IAC4 () == 0)
203	return 4;
204
205	return 0;
206	} /* bedbug405_find_empty */
207	\f
208
209
210	/* ======================================================================
211	* Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
212	* number, otherwise reassign the given breakpoint. If hardware debugging
213	* is not enabled, then turn it on via the MSR and DBCR0. Set the break
214	* address in the appropriate IACx register and enable proper address
215	* beakpoint in DBCR0.
216	* ====================================================================== */
217
218	int bedbug405_set (int which_bp, unsigned long addr)
219	{
220	/* -------------------------------------------------- */
221
222	/* Only look if which_bp == 0, else use which_bp */
223	if ((bug_ctx.find_empty) && (!which_bp) &&
224	(which_bp = (*bug_ctx.find_empty) ()) == 0) {
225	printf ("All breakpoints in use\n");
226	return 0;
227	}
228
229	if (which_bp < 1 \|\| which_bp > MAX_BREAK_POINTS) {
230	printf ("Invalid break point # %d\n", which_bp);
231	return 0;
232	}
233
234	if (!bug_ctx.hw_debug_enabled) {
235	SET_MSR (GET_MSR () \| 0x200); /* set MSR[ DE ] */
236	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IDM);
237	bug_ctx.hw_debug_enabled = 1;
238	}
239
240	switch (which_bp) {
241	case 1:
242	SET_IAC1 (addr);
243	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA1);
244	break;
245
246	case 2:
247	SET_IAC2 (addr);
248	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA2);
249	break;
250
251	case 3:
252	SET_IAC3 (addr);
253	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA3);
254	break;
255
256	case 4:
257	SET_IAC4 (addr);
258	SET_DBCR0 (GET_DBCR0 () \| DBCR0_IA4);
259	break;
260	}
261
262	return which_bp;
263	} /* bedbug405_set */
264	\f
265
266
267	/* ======================================================================
268	* Disable a specific breakoint by setting the appropriate IACx register
269	* to zero and claring the instruction address breakpoint in DBCR0.
270	* ====================================================================== */
271
272	int bedbug405_clear (int which_bp)
273	{
274	/* -------------------------------------------------- */
275
276	if (which_bp < 1 \|\| which_bp > MAX_BREAK_POINTS) {
277	printf ("Invalid break point # (%d)\n", which_bp);
278	return -1;
279	}
280
281	switch (which_bp) {
282	case 1:
283	SET_IAC1 (0);
284	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA1);
285	break;
286
287	case 2:
288	SET_IAC2 (0);
289	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA2);
290	break;
291
292	case 3:
293	SET_IAC3 (0);
294	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA3);
295	break;
296
297	case 4:
298	SET_IAC4 (0);
299	SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA4);
300	break;
301	}
302
303	return 0;
304	} /* bedbug405_clear */
305
306
307	/* ====================================================================== */
308	#endif